The absorption spectrum of an atom shows pattern of dark lines or bands attained by transmitting absorbed light beam into the spectroscope.
What does an atom's absorption spectrum look like?By sending an absorbed light beam into a spectroscope, one can create a pattern of black lines or bands.
The vapors or solution of a substance in the discharge tube are illuminated by a white light. After passing through a spectroscope, the transmitted light produces a spectrum of black lines at specific wavelengths. These shady lines match the light radiation wavelengths that the material has absorbed.
An atom, ion, or molecule absorbs photons with energies equal to the energy difference between the two states when it transitions from one to the other. An absorbance spectrum that depicts the intensity of emission as a function of wavelength is the end result.
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How is a compound different than a
mixture?
a. A compound can be separated by physical
means.
b. A mixture can be separated by physical
means.
c. A mixture is made of only one type of atom.
d. A compound is made of only one type of
atom
Answer:
B.) A mixture can be separated by physical means.
Explanation:
While it may be difficult, mixtures can be separated back into their original elements/compounds. Compounds cannot be separated because their original elements/compounds bond together to form the new compound. The only way to separate compounds is through chemical (or drastic physical) means.
Self-driving cars are already cruising the streets today. And while these cars will ultimately be safer and cleaner than their manual counterparts, they can’t completely avoid accidents altogether.
In your initial post, you should address the moral and ethical dilemas of self-driving cars. Include a personal reflection in your post. You must respond to at least two classmates' post in a meaningful way to receive full credit.
You do not have to answer all of the questions below. These questions are here to aid you as you reflect on the topic.
1. Is there a clear cut morally or ethically correct answer to the situation described?
2. Who gets to decide how the car will be programmed and what decision the car will make? Is that fair?
3. What if the person programming the car has different ethical and moral beliefs than the general public?
4. What if the person programming the car is biased and/or looking to make money for the car company?
5. Are moral/ethics situational? Why or why not?
6. What is the difference between a ”reaction” (human driver’s split second response) and a “deliberate decision” (driverless car’s calculated response)?
7. Programing a car to react in a certain way in an emergency accident situation could be viewed as premeditated homicide. Do you think this is a valid argument? Why or why not?
8. In the situation described, would you prioritize your safety over everyone else’s by hitting the motorcycle?
9. In the situation described, would you minimize danger to others by not swerving? if so, you would hit the large object and potentially die.
10. In the situation described, would you take the middle ground by hitting the SUV since it’s less likely the driver will be injured? Compare this to hitting the motorcycle.
Self -driving cars are just like any other human invention. With respect to efficiency, every human invention has always been progressive. Hence, It is right to state that as far as ethical dilemmas are concerned, there is nothing wrong with self-driving cars.
What is an ethical dilemma?An ethical dilemma is a situation (more of a problem) where there is a conflict of tension between two opposition options each of which are not good ethically.
Why are Self-Driving Car not unethical?The above question is like asking, "why are C-19 vaccines not unethical?".
It is to be noted that most if not all inventions of man are amoral. Self-Driving cars are not intentionally created to destroy property or lives. As with most inventions, the damage is done in how they are used.
What if those programming the cars are economically biased in favor of the company?In the age of capitalism, there is yet to be any organization that is not biased economically in favor of itself.
The best that the government can do is to set up a team of industry experts that understand how the self-driving cars operate to audit, control, and check what cars are released for legal use on the streets.
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What is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen? Express your answer with the appropriate units.
1.5 mol is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
2Al + [tex]\frac{3}{2}[/tex] O₂ → Al₂O₃
4Al + 3O₂ → 2 Al₂O₃ [Balanced Chemical Equation]
When aluminium is the limiting reagent then
3.00 × [tex]\frac{1}{2}[/tex] = 1.5 mol
When oxygen is the limiting reagent then
2.55 × [tex]\frac{2}{3}[/tex] = 1.70 mol
Thus from the above conclusion we can say that 1.5 mol is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen.
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/Why does an atom want all of it’s orbitals filled
Why does it want to be in a stable state
Acids react with insoluble metal oxides to produce salts.
Plan a method to produce a pure, dry sample of the soluble salt copper chloride from
an acid and a metal oxide.
[6 marks]
The soluble copper chloride is obtained by evaporation and then by crystallization.
How can dry copper chloride be formed from an acid and a metal oxide?Copper chloride is a soluble salt that can be produced from the reaction between hydrochloric acid and copper oxide.
Soluble salts are obtained by crystallization.
The equation of the reaction is given below:
CuO + 2 HCl ---> CuCl₂ + H₂OThe soluble copper chloride is obtained by evaporation and then by crystallization.
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4. Which of the following processes is shown in this part of the carbon cycle?
O Photosynthesis
O Decomposition
O Consumption
Respiration
Answer:
Your answer must be O Photosynthesis or Respiration because
Explanation:
Photosynthesis involves the usage of carbon in the form of carbon dioxide by plants and algae.
Respiration involve the release of carbon dioxide in the environment by living organisms.
Hope its helpful!
Answer:
Your answer must be O Photosynthesis
Explanation:
What is the molarity of a solution where 36.1 grams of potassium permanganate is dissolved in enough water to make 0.566 L of solution
0.4 M is the molarity of the solution.
The molarity of solution can be calculated by : [tex]C_M[/tex] = [tex]n/V[/tex] where,
n is the no. of moles of solute([tex]KMNO_4[/tex]) and
[tex]V[/tex] is the volume of the solution in L.
Now,
No. of moles can be calculated by: Given mass/ Molar mass
Molar mass of [tex]KMNO_4[/tex] is 158.034 g/mole
No. of moles of [tex]KMNO_4[/tex] = 36.1 g / 158.034 g/mole = 0.228 (app.) moles
Molarity of solution = 0.228 moles /0.566 L = 0.4 mol/L or 0.4 M
Hence, the molarity of a solution where 36.1 grams of potassium permanganate is dissolved in enough water to make 0.566 L of solution is 0.4 M
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Activation energy is: A. The maximum amount of energy reactants can hold. B. The energy needed to begin breaking the bonds of products. C. None of these. D. The energy needed to begin breaking the bonds of reactants.
Activation energy is the energy needed to begin breaking the bonds of reactants and is denoted as option D.
What is a Reactant?These are the substances which take part in a chemical reaction and result in the formation of the product.
The activation energy is required as it breaks the bonds of the reactant thereby resulting in the product being formed. This therefore makes it the most appropriate choice.
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The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be 2.76J·g°C. Suppose 466.g of the substance are heated until the temperature of the sample has changed by 39.4°C. Write an equation that will let you calculate the heat that was needed for this temperature change. Your equation should contain only symbols.
Answer:
See below
Explanation:
ΔQ = m c T ΔQ = heat required(J) m = mass (g) T = C° temp change
c = heat capacity in J/g-C
What is h called in the equation e - tha ?
o a. planck's constant
o b. einstein's constant
o c. the em constant
o d. the speed of light
Planck's constant symbolized (h) relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.
What is Planck's constant ?The equation, E=hf, is referred to as the Planck relation or the Planck-Einstein relation. The letter h is named after Planck, as Planck's constant.
The letter h is named after Planck, as Planck's constant. Energy (E) is related to this constant h, and to the frequency (f) of the electromagnetic wave.Planck’s constant, (symbol h), fundamental physical constant characteristic of the mathematical formulations of quantum mechanics, which describes the behaviour of particles and waves on the atomic scale, including the particle aspect of light. it's value is Plank's constant (h=6.626×10^-34 J s).Learn more about Planck's constant here:
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If the system 3H2(g) N2(g) 2NH3(g) is at equilibrium and more N2 is added, a net reaction that consumes some of the added N2 will occur until a new equilibrium is reached. Group startsTrue or False
Group Starts True
A rightward change in equilibrium.
The concentration of gases = [H2] will decrease, [N2] will increase, [NH3] will increase when the new equilibrium is reached.
Additional heat is produced.
The forward and backward reactions' rates quicken in the new equilibrium.
The equilibrium constant decreases as more heat is released.
the exothermic nature of the process.
The equilibrium constant would not have changed if the temperature had remained constant.
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alue: 4 Why did Joseph Stalin not allow elections in the nations the Soviets occupied with their troops after World War II? a. He knew that these nations would not want a foreign ruler. O b. He knew these nations would be anti-Soviet since they had waged war in these nations. O c. He knew these nations would elect leaders who would try to go back to war with the Soviet Union. Od. He knew that communist members in his nation would not like elections. =/4 Prev Next >
Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because: option B.
What is the Cold War?The Cold War was a period of open and intense conflict between the United States of America and the Soviet Union that developed almost immediately after World War II (Second World War).
Also, the Cold War officially started on the 12th of March, 1947 and came to an end on the 3rd of December, 1989.
Based on historical information and records, we can reasonably infer that Joseph Stalin didn't allow elections in the nations the Soviets occupied with their troops after World War II because he knew these nations would be anti-Soviet since they had waged war in these nations.
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Describe the type of force which exists between particles in an ideal gas.
A. There are strong attractive and repulsive forces between gas particles.
B. There are no attractive or repulsive forces between gas particles.
C. There are only attractive forces between gas particles.
D. There are only repulsive forces between gas particles.
The force that exists between particles in an ideal gas are no attractive or repulsive forces between gas particles.
What is an ideal gas?An ideal gas is a gas that obeys the ideal gas law. Ideal gases do not liquify at normal temperature and pressure since the gases do not interact.
Hence, the force that exists between particles in an ideal gas are no attractive or repulsive forces between gas particles.
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Radiation
Project: Solar Cooker
In the solar cooker, reflective material like aluminum is used to collect and trap the heat from the sunlight while the interior is painted to reduce heat loss.
What is a solar cooker?A solar cooker is a cooker which uses the energy of sunlight to cook food.
In designing a solar cooker, a solar collector such as reflective material like aluminum is used to collect and trap the heat from the sunlight.
The interior of the cooker is painted black to avoid heat loss by radiation.
Cardboard boxes are used as insulating materials.
In conclusion, a solar cooker is designed to maximize solar energy collected and minimize heat loss.
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There are 1.00 mol each of H2 and I2 in a 2.00 L flask. The Kc for this reaction is 55.3. Determine the equilibrium concentrations of all chemical species at room temperature.
The equilibrium concentrations of all chemical species at room temperature are given below.
[H2] = 0.212M[I2] = 0.212M[HI] = 1.576MH2(g) + I2(g) <-----> 2HI(g)
I 1 1 0
c -x -x 2x
E 1-x 1-x 2x
[H2] ⇒ 1-x/1 = 1-x
[I2] ⇒ 1-x/1 = 1-x
[HI] ⇒ 2x
Kc = [HI]^2/[H2][I2]
55.3 = (2x)^2/(1-x)(1-x)
55.3 = (2x/1-x)^2
7.44 = 2x/1-x
7.44*(1-x) = 2x
x = 0.788
[H2] ⇒ 1-x = 1-0.788 = 0.212M
[I2] ⇒ 1-x = 1-0.788 = 0.212M
[HI] ⇒ 2x = 2*0.788 = 1.576M
In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.
Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.
We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.
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The equilibrium concentrations of all chemical species at room temperature are given below.
[H2] = 0.212M
[I2] = 0.212M
[HI] = 1.576M
H2(g) + I2(g) <-----> 2HI(g)
I 1 1 0
c -x -x 2x
E 1-x 1-x 2x
[H2] ⇒ 1-x/1 = 1-x
[I2] ⇒ 1-x/1 = 1-x
[HI] ⇒ 2x
Kc = [HI]^2/[H2][I2]
55.3 = (2x)^2/(1-x)(1-x)
55.3 = (2x/1-x)^2
7.44 = 2x/1-x
7.44*(1-x) = 2x
x = 0.788
[H2] ⇒ 1-x = 1-0.788 = 0.212M
[I2] ⇒ 1-x = 1-0.788 = 0.212M
[HI] ⇒ 2x = 2*0.788 = 1.576M
In a chemical reaction, while each reactant and the products are in a concentration that does not alternate with time any extra, it is said to be in a state of chemical equilibrium. in this kingdom, the price of forwarding response is the same as the rate of backward response.
Equilibrium is whilst the fee of the ahead reaction equals the charge of the opposite reaction. All reactant and product concentrations are consistent at equilibrium.
We are saying that a chemical is in an equilibrium concentration while the products and reactants do not change as time moves on. In different words, chemical equilibrium or equilibrium awareness is a state when the price of an ahead reaction in a chemical response will become equal to the rate of a backward response.
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What mass of carbon dioxide is produced upon the complete combustion of 17.0 LL of propane (the approximate contents of one 5-gallon tank)
The mass of carbon dioxide that is produced will be 31,671 grams or 31.671 kg
Stoichiometric calculationsFirst, the equation of the reaction:
[tex]C_3H_8(g)+5O_2(g)-- > 3CO_2(g)+4H_2O(g)[/tex]
The mole ratio of propane burned to carbon dioxide produced is 1:3.
The density of propane gas is 0.621 g/mL, thus, 17.0 L of propane will weigh:
Density = mass/volume, mass = 0.621 g/mL x 17000 = 10,557 g
Mole of 10,557 g of propane = 10557/44.1 = 239.39 moles
Equivalent mole of carbon dioxide produced = 239.39 x 3 = 718.16 moles
Mass of 718.16 moles carbon dioxide = 718.16 x 44.1 = 31,671 grams or 31.671 kg
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A 55.0 kg sample of an unknown metal C requires 675kj of energy to heat it from 25.0 to 118.0C. Okie hat is the specific best of the unknown metal?
Answer:
See below
Explanation:
Specific heat is 'c'
Q = m c T where T i s change in temp
675 = 55 c (118-25)
c = .13196 kJ / kg-C ...I do not know what units you want....
this is also .13196 J/gm-C
A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to form methanol (CH3OH). How many grams of methanol are produced when 14 grams of carbon monoxide reacts with 1.5 grams of hydrogen gas
12 g CH3OH are produced when 14 grams of carbon monoxide reacts with 1.5 grams of hydrogen gas.
Writing the balanced equation for the reaction taking place:
CO(g) + 2H2(g) ⇒ CH3OH
Finding the limiting reactant:
moles CO present ⇒ 14 g x 1 mol CO / 28 g = 0.5 moles CO
moles H2 present ⇒ 1.5 g x 2 mol H2 / 2 g = 0.75 moles H2O
Because according to the balanced equation it takes 2 moles of H2 for every 1 mole CO, there isn't enough H2, so it is limiting and will dictate how much CH3OH can be made.
Mass of CH3OH produced
= 0.75 moles H2 x 1 mol CH3OH / 2 mol H2 x 32 g CH3OH / mol
= 12 g CH3OH
A synthesis response is a sort of reaction in which a couple of reactants combine to form a single product. it's a kind of chemical reaction wherein two or extra simple materials combine to shape a more complicated product.
it is surely a matter of creating connections or placing things collectively. We synthesize statistics evidently to help others see the connections between things. For example, whilst you document to a pal the matters that numerous other pals have said approximately a tune or movie, you're carrying out a synthesis.
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Which factor does not increase the rate of a reaction? decreasing the concentration of the reactants increasing the temperature of the system increasing the surface area of the reactants adding an effective catalyst to the system
Rate of Reaction:
The factor that does not increase the rate of a reaction is "decreasing the concentration of the reactants".
Factors that increase the rate of a reaction:
Increasing the temperature of the system: The average kinetic energy of the reactant molecules will rise as the temperature rises. As a result, a higher percentage of molecules will possess the minimal amount of energy required for an efficient collision, increasing the rate of reactions.Increasing the surface area of the reactants: More particles are exposed to the other reactant when the surface area of a reactant is increased. Particles collide more frequently, increasing the number of successful collisions per second. Thus increasing the rate of reaction.Adding an effective catalyst to the system: A catalyst is a substance that participates in a reaction without being absorbed, speeding up the process. An additional reaction pathway to produce compounds is offered by catalysts.
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Lina has worked hard to gather data for her experiments. With her last set of data she received, she is ready to publish her paper in
a peer-reviewed journal. In order to do that, she has to make sure that all of her data has consistent SI units, significant figures and
in scientific notation if necessary. Help Jessica get all of her data in order. How many significant figures are in 43.8lbs?
43.8 has 3 significant figures and 1 decimal.
What are significant figures?The term significant figures refer to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
All zeros that occur between any two non-zero digits are significant. For example, 108.0097 contains seven significant digits. All zeros that are on the right of a decimal point and also to the left of a non-zero digit are never significant. For example, 0.00798 contained three significant digits.
Hence, 43.8 has 3 significant figures and 1 decimal.
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Who arranged the elements into the first periodic table?
Answer:
Chemist Dmitri Mendeleev
4. A weather balloon containing 35.0 L of helium at 98.0 kPa is released and rises.
Assuming that the temperature is constant, fine the volume of the balloon when the
atmospheric pressure is 25.0 kPa at a height of about 25 km.
Answer:
137.2 L
Explanation:
p1v1 = p2v2
p1v1 / p2 = v2
98 * 35 / 25 = v2 = 137.2 L
To find the volume of the balloon when the atmospheric pressure is 25.0 kPa at a height of about 25 km, we can use Boyle's Law,as per which volume is 137.2 L.
Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Boyle's Law equation: P₁ V₁ = P₂ V₂
Given:
P₁= 98.0 kPa (initial pressure of the balloon)
V₁ = 35.0 L (initial volume of the balloon)
P₂ = 25.0 kPa (final atmospheric pressure)
V₂= unknown (final volume of the balloon)
Plugging in the values into Boyle's Law equation, we have:
98.0 kPa × 35.0 L = 25.0 kPa × V₂
To find V₂, we can rearrange the equation:
V₂ = [tex]\dfrac{98}{35}\times{25}\\=137.2 \ L.[/tex]
Therefore, the volume of the balloon when the atmospheric pressure is 25.0 kPa at a height of about 25 km is approximately 137.2 L.
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I need this so badly!
I will give 50 points!
please no false answers/ spam links!!!!!
Determine the molar mass of a 0.314-gram sample of gas having a volume of 1.6 L at 287 K and 0.92 atm. Show your work
Describe the temperature and pressure conditions at which the gas behaves like an ideal gas.
Answer:
See below
Explanation:
Use Ideal Gas Law
PV = n RT using R = .082057366 l-atm/k-mol
T must be in Kelvin
solve for 'n'
.92 * 1.6 = n * .082057366 * 287
n = .0625 moles
then the mole weight: .0625 * x = .314
x = mole weight = 5.025 gm
"Systems with either very low pressures or high temperatures enable real gases to be estimated as “ideal.” "
The ideal gas equation estimates the molar mass of the substance with the help of the moles. The molar mass of 0.314 gm sample and 1.6 L volume is 0.503g/mol.
What is an ideal gas?The gas is said to be ideal at low pressure, and high-temperature conditions as the potential energy and the molecular size become negligible because of the intermolecular forces.
The ideal gas equation is given as,
PV = nRT
Given,
Pressure (P) = 0.92 atm
Volume (V) = 1.6 L
Gas law constant (R) = 0.0821
Temperature (T) = 287 K
Mass of sample = 0.314 gram
No. of moles = n
The moles are calculated as:
PV = nRT
0.92 × 1.6 = n × 0.0821 × 287
1.47 = 23.56 × n
n = 1.47 ÷ 23.56
n = 0.624 moles
Now, from moles, the molar mass is calculated as,
Molar mass = mass ÷ moles
Molar mass = 0.314g ÷ 0.624mol
Molar mass = 0.503 g/mol
Therefore, 0.503g/mol is the molar mass of the 0.314 gm sample.
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A 0.65 M solution of an unknown amine base is found to be 2.2% ionized at equilibrium. Calculate the value for Kb for this amine.
The value of Kb of the unknown amine is 3.22 x 10^-4.
Weak electrolytes:
The compound which do not dissociate completely when added to the aqueous solution are called weak electrolytes. The electrolyte and its ions exists in equilibrium. In case of weak base, the equilibrium constant is expressed as Kb.
Calculations:
Step 1:
The percentage of amine ionized at equilibrium is 2.2%.
NH3 + H2O ------> NH4+ + OH-
The concentration of conjugate acid at equilibrium is calculated as:
2.2 = (x/0.65) x 100
x = 0.0143 M
Step 2:
The equilibrium constant (Kb) is calculated as:
Kb = x^2/0.65 - x
= (0.0143)^2/(0.65 - x)
= 3.22 x 10^-4
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__________ is often a limiting nutrient for many organisms, especially plants. A. Carbon B. Nitrogen C. Sulfur D. Phosphorus
1. The spontaneous disintegration of a nucleus into a a slightly lighter and more ________ nucleus, accompanied by emission of particles, electromagnetic radiation, or both
The spontaneous disintegration of a nucleus into a slightly lighter and more radioactive nucleus is accompanied by the emission of particles, electromagnetic radiation, or both.
Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei into atomic nuclei to shape greater energetically strong atomic nuclei.
Radioactive decay is a tremendously exoergic, statistically random, first-order system that occurs with a small amount of mass being converted to strength.
Spontaneous disintegration of a radionuclide with the emission of lively particles or radiation, consisting of alpha or beta debris or gamma rays.
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g A solution is made by dissolving 0.0550 moles of Ba(OH)2 in enough water to make 325 mL of solution. What is the pH of the resulting solution
The pH of this solution is 13.529.
Given:
Number of moles Ba(OH)₂ = 0.0550 moles
Volume = 325 mL
The calculation for moles:
[tex]Ba (OH)_{2}[/tex] → [tex]Ba^{2}[/tex]⁺ + [tex]2OH[/tex]
In 1 moles Ba(OH)₂ we have 2 moles OH-
In 0.0550 moles Ba(OH)₂ we have 2*0.0550 = 0.11 moles OH-
The calculation for concentration:
[OH-] = moles / volume
[OH-] = 0.11 moles / 0.325 L
[OH-] = 0.338 M
Calculation of pOH:
pOH = -log[OH-]
pOH = -log(0.338)
pOH = 0.471
Calculation of pH:
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 0.471
pH = 13.529
Thus, the pH of this solution is 13.529.
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Q1. What are decomposition reactions? Explain with the help of a balanced chemical equation. (2 marks)
Q2. Draw the structure of a nephron and label the following on it- Glomerulus, Bowman’s capsule, Renal artery and Collecting duct. (2 marks)
Q3. What happens when zinc metal reacts with sulphuric acid? Write the chemical equation involved in this reaction. (2 marks)
Q4. Draw ray diagrams showing the image formation by a convex lens when an object is placed (2 marks)
(a) between optical centre and focus of the lens
(b) between focus and twice the focal length of the lens
Q5. Sunita and her mother had an appointment with an optician. Optician prescribed corrective lenses to Sunita having a power equal to + 5.0 D. The lens prescribed to
her mother has power equal to – 2.5 D. (3 marks)
(a) What is the focal length of the lens prescribed to Sunita?
(b) Which type of spherical lens is prescribed to Sunita’s mother?
(c) What is the power of the combination of the two lenses (if placed in contact), prescribed to Sunita and her mother?
Q6. Give the reason for the following: (3 marks)
(a) The taste and smell of chips change when the packet is left open for a few days.
(b) Magnesium ribbon is cleaned before burning in air.
(c) Iron articles get coated with reddish brown powder when left for sometime.
Q7. (a) Why do arteries have thick and elastic walls while veins have thin walls? (2 marks)
(b) What is the role of valves in the heart? (1 mark)
pls help me someone
Decomposition reaction represents the breakdown of single compound into more products.
What are decomposition reactions?A decomposition reaction is a type of reaction in which one reactant breaks down into two or more products. This can be represented by the general equation: H2O2 → 2H + 2O. In this example the breakdown of hydrogen peroxide occurs and water and oxygen are formed.
What happens when zinc metal reacts with sulphuric acid?Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen This hydrogen goes up into the atmosphere whereas the zinc sulphate remains.
Why should a magnesium ribbon be cleaned before burning in air?Magnesium ribbon should be cleaned before burning in air because Magnesium metal combines with oxygen to form Magnesium Oxide (MgO) layer, which is a very stable molecule.
Why arteries have thick, elastic walls, while veins have thin walls?Arteries have thick, elastic walls, while veins have thin walls because arteries are under more pressure, as compared to veins that are under less pressure. Arteries are big in size whereas veins are small.
What is the role of valves in the heart?The role of valves in the heart is that these valves prevent the backward flow of blood.
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The substances generated by the reaction are called _______________, and their formulas are placed on the right side of the equation.
The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation.
What is a Chemical Reaction ?A chemical reaction is a process in which chemical bonds between atoms to break and recognize, to form other new substances.
What is Product and Reactant in a chemical reaction ?The substance which is present at the left hand side or start of a chemical reaction is known as Reactant.
The substance which is present at the right hand side or end of a chemical reaction is known as Product.
Example: Na + Cl → NaCl
Here Na and Cl are on the left hand side of a reaction so Na and Cl are reactants. Here NaCl is on the right hand side of a reaction so NaCl is product.
Thus from the above conclusion we can say that The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation.
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A 80.0 g sample of copper (specific heat = 0.20 J/g °C ) is heated and then added to 100 g water at 22.3 °C. The final temperature of the water and copper is 26.9°C. What is the original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water
The original temperature of the copper is 145.4 °C
What is temperature?Temperature refers to the degree of hotness or coldness of a body. Now we know that the heat lost by the copper is equal to the heat gained by the water. The heat lost is negative while the heat gained is positive.
Hence;
-(mcdT)= mcdT
-(80.0 * 0.20 ( 26.9 - T)) = 100 * 4.12 * (26.9 - 22.3 )
-(430.4 - 16T) = 100 * 4.12 * (26.9 - 22.3 )
-430.4 + 16T = 1895.2
T = 1895.2 + 430.4 /16
T = 145.4 °C
The temperature of the copper is 145.4 °C.
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