Answer:
See explanation below
Explanation:
To get this, we need to apply the general expression for half life decay:
N = N₀e(-λt) (1)
Where:
N and N₀ would be the final and innitial quantities, in this case, masses.
t: time required to decay
λ: factor related to half life
From the above expression we need λ and t. To get λ we use the following expression:
λ = t₁₂/ln2 (2)
And we have the value of half life, so, replacing we have:
λ = 8.04 / ln2 = 11.6
Now, we can replace in (1) and then, solve for t:
0.75 = 40 exp(-11.6t)
0.75 / 40 = exp(-11.6t)
ln(0.01875) = -11.6t
-3.9766 = -11.6t
t = -3.9766 / -11.6
t = 0.34 daysGive examples of how land resources are used in a city setting
Answer:
Land resources such as gravel and bedrock are used to construct buildings, roads, and sidewalks. Land is also where city structures—such as buildings, roads, and sidewalks—are constructed. People use land resources such as bedrock and aggregate to construct buildings, roads, and sidewalks.
I hope this answer helps
Name the process by which oxygen moves from alveoli to blood
diffusion...........the blood through the capillaries lining the alveolar walls. Once in the bloodstream, oxygen gets picked up by the hemoglobin in red blood cells.
Help meeeeee
A 280.0 sample of neon gas exerts a pressure of 660.0 mm Hg at 26.0°C. Assuming that the pressure remains constant, at what temperature in would the volume change to 440.0 ml?
Answer:
469.9K
Explanation:
Using Charles's law equation:
V1/T1 = V2/T2
Where;
V1 = initial volume (ml)
V2 = final volume (ml)
T1 = initial temperature (K)
T2 = final temperature (K)
Based on the information provided:
V1 = 280.0ml
V2 = 440.0 ml
T1 = 26.0°C = 26 + 273 = 299K
T2 = ?
Using V1/T1 = V2/T2
280/299 = 440/T2
0.936 = 440/T2
T2 = 440 ÷ 0.936
T2 = 469.9K
1. If you have 8.1 g CO₂ and 2.3 g H₂, which one is the limiting reactant. Show your work. 2. Calculate the theoretical yield of CH₄.
Answer:
2.95 g of CH₄
Explanation:
To start this, we determine the equation:
4H₂ + CO₂ → CH₄ + 2H₂O
4 moles of hydrogen react to 1 mol of carbon dioxide in order to produce 1 mol of methane and 2 moles of water.
To determine the limiting reactant, we need to know the moles of each reactant.
8.1 g . 1 mol/ 44g = 0.184 moles of carbon dioxide
2.3 g . 1mol / 2g = 1.15 moles of hydrogen
4 moles of hydrogen react to 1 mol of CO₂
Then, 1.15 moles may react to (1.15 . 1) /4 = 0.2875 moles
We only have 0.184 moles of CO₂, so this is the limiting reactant. Not enough CO₂ to complete the 0.2875 moles that are needed.
Ratio is 1:1. 1 mol of CO₂ produces 1 mol of methane
Then, 0.184 moles of CO₂ will produce 0.184 moles of CH₄
We convert moles to mass: 0.184 mol . 16 g /mol = 2.95 g
How many joules of heat are needed to raise the temperature of 62.0 g of ethylene glycol from 13.1 C to 40.5C?
Answer:
Q = 4133.2 J
Explanation:
Hello there!
In this case, since these calorimetry problems are based off the following heat equation involving heat (Q), mass (m), specific heat (C) and temperatures (T):
[tex]Q=mC(T_2-T_1)[/tex]
Thus, we plug in the given variables to obtain:
[tex]Q=62.0 g*2.433 \frac{J}{g\°C}* (40.5\°C-13.1\°C)\\\\Q=4133.2J[/tex]
Regards!
On the bottom beam of the triple beam balance, each small division stands for
A.) one centimeter
B.) one milliliter
C.) one gram
D.) one-tenth of a gram
Answer:
Hello There!!
Explanation:
I believe the answer is D.) one-tenth of a gram.
hope this helps,have a great day!!
~Pinky~
[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]
D.) one-tenth of a gram
Thanks.Hope it helps.147.0 g piece of metal was heated to 155 C and added to a calorimeter containing 75.0 grams of water. The temperature of the water in the calorimeter was 23.5 C. After the metal was added, the temperature rose to 33.5 C. What is the specific heat of the metal?
At STP, which of the following would have the same number of molecules at 1 L of C2H4 gas? Assume that each behaves as an ideal gas.
A. 0.5 L of H2 gas
B. 2 L of H2O gas
C. 1 L of Ne gas
D. 3 L of Cl2 gas
Answer: 1L of Ne gas
The answer is Option C , 1L of Ne gas will have the same number of molecules at 1 L of C₂H₄ gas
What is STP ?At standard temperature and pressure, a system is said to have a temperature of zero degrees centigrade (273 Kelvins) and the pressure equal to the atmosphere is always 1 atm.
Additionally, one mole of any gas at STP occupies a volume of 22.414 L.
This concept only holds true for gases.
So for a gas having same pressure , temperature and moles according to the Ideal Gas Law , volume also needs to be same
pV=nRT
and in the given option ,Option C has the same volume as that of 1 L of C₂H₄ gas .
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5. How would you calculate the pH (NOT POH) of a base when given
the concentration of [OHJ?
Answer:
pOH = -log₁₀ [OH-]
pH = 14 - pOH
Explanation:
First of all, calculate the value of pOH from the hydroxide concentration do this using the equation below;
pOH = -log₁₀ [OH-]
After obtaining the pOH, calculate pH using the equation below:
pH + pOH = 14
pH = 14 - pOH
How many protons, neutrons, and electrons are found in a neutral atom of hydrogen-333?
Answer:
Explanation:
A hydrogen atom has an atomic number of 1.
So it's proton number will always be 1.
A neutral hydrogen atom does not have any charge.
So it has the same amount of electrons as protons, which turns out to be also 1.
A neutral hydrogen atom has an atomic mass of ≈
1.00794 amu ≈ 1 amu.
To find the amount of neutrons, we take the proton number and subtract it from the mass number.
1 − 1 = 0
So a neutral hydrogen atom has no neutrons.
In summary,
A hydrogen atom has
1 proton
1 electron
0 neutrons
I hope that helps!
What is a jet stream. in your own words but be more detailed about what you say.
(don't send a link)
Describe and show an example of valence electrons. What is a common trend you can remember to help you understand valence electrons?
Explanation:
valency from right to left in a Periodic Table in same period first increases then decreases and from top to bottom it is same for a same group
A balloon contains 25.0 L of helium gas at 177 kPa. What is the volume when the balloon rises to an altitude where the pressure is only 43.0 kPa ? Assume the temperature remains constant.
A.34.2 L
B.68.8 L
C.46.5 L
D.103 L
1) Escribe oraciones coherentes que incluyan los siguientes términos con los conceptos correspondientes:
CARBÓN-PETRÓLEO-GAS NATURAL-RECURSO NO RENOVABLE-
COMBUSTIBLES FÓSILES-HIDROCARBUROS-RESERVAS-CONTAMINACIÓN-
MAREAS NEGRAS
La respuesta correcta para esta pregunta abierta es la siguiente.
Estas son las oraciones apropiadas.
El carbón, el petróleo, y el gas natural son recursos naturales no renovables.
Estos generadores naturales de energía son considerados combustibles fósiles que produce la mayor parte de hidrocarburos que se usan en el mundo. Sin embargo, estas reservas energéticas se están agotando porque son recursos naturales no renovables. Además, estos combustibles son altos generadores de contaminación como es el caso de las mareas negras.
Independientemente de estas ideas, es apropiado decir que los combustibles fósiles han sido fuertemente cuestionados por los ambientalistas y los científicos porque son causantes del llamado calentamiento global y del cambio climático.
Por esa razón, la sociedad y los expertos ambientalistas están pidiendo que los gobiernos comiencen a utilizar más energías alternativas y renovables como la energía solar y las turbinas de viento o energía eólica.
What mass of potassium would need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C? (cpotassium = 0.753 J/g°C)
Answer:
Explanation:
q = mCΔT
m =CΔT/q
ΔT = 57.8°C - 44.3°C = 13.5°C
m = (0.753*13.5)/2350
m = 0.00433 g
The mass of potassium that will need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C is 231.17 g
Data obtained from the question Heat (Q) = 2350 JInitial temperature (T₁) = 44.3 °CFinal temperature of water (T₂) = 57.8 °CChange in temperature (ΔT) = 57.8 – 44.3 = 13.5 °C Specific heat capacity (C) = 0.753 J/gºC Mass (M) =?Q = MCΔT
2350 = M × 0.753 × 13.5
2350 = M × 10.1655
Divide both side by 10.1655
M = 2350 / 10.1655
M = 231.17 g
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2 Iron(III) oxide (Fe2O3) is reduced by carbon on heating to give iron metal (Fe) and
carbon dioxide (CO2). (Ar values Fe 56, C 12,0 16)
When 480 g of Fe2O3 is heated with carbon, 336 g of Fe and 198 g of CO2 are produced.
Use the Law of Conservation of Mass to work out the mass of carbon that
reacted.
a
no links please i need this ASAP
Using the law of conservation of mass, the mass of carbon reacted is 54 g of carbon.
What is the law of conservation of mass?According to the law of conservation of mass, matter is neither created nor destroyed. This means that the total mass of reactants is equal to the total mass of products.
Total mass of the products = 336g + 198g = 534 g
Total mass of reactants = 480 g + x g
From the law of conservation of mass; 534 g = 480 g + x g
x g = 534 g - 480 g
x g = 54 g
Hence, 54 g of carbon reacted.
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How many moles is 8.3 x 10^12 atoms or particles of Br2
urgent
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{8.3 \times {10}^{12} }{6.02 \times {10}^{23} } \\ \\ \\ \\ \: \: \: \: \: \: \: = 1.379 \times {10}^{ - 11} \: \: \: \: moles[/tex]
Hope this helps you
Describe the three-dimensional property of an electromagnetic wave. Use the diagram below
Answer: The are waves that consist of vibrating electric and magnetic fields. They transmit energy through matter or across space. Some electromagnetic waves are generally harmless. Like other waves, electromagnetic waves have properties of speed, wavelength, and frequency.
Explanation:
How many moles of O₂ are needed to react completely with 35.0 mol of FeCl₃?
4FeCl3+3O2->2Fe2O3+3Cl2
The 2 for the second half of the equation is not a coefficient it’s supposed to be for 2Fe2 Not 2O3.
26.3 mol
46.7 mol
23.3 mol
10.0 mol
Answer:
26.3 mol O₂
Explanation:
Step 1: Write the balanced equation
4 FeCl₃ + 3 O₂ ⇒ 2 Fe₂O₃ + 6 Cl₂
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of FeCl₃ to O₂ is 4:3.
Step 3: Calculate how many moles of O₂ are needed to react completely with 35.0 mol of FeCl₃
We will use the previously established molar ratio.
35.0 mol FeCl₃ × 3 mol O₂/4 mol FeCl₃ = 26.3 mol O₂
Titaium oxside is often added to food to color it white. If a jelly bean contains approximately 1.28x10-5 moles of TiO2, how many grams of TiO2 are in a jelly bean
Answer:
1.02 × 10⁻³ g
Explanation:
Step 1: Given data
Number of moles of titanium (IV) oxide in 1 jelly bean (n): 1.28 × 10⁻⁵ moles
Step 2: Calculate the mass (in grams) corresponding to 1.28 × 10⁻⁵ moles of TiO₂
To convert moles to mass, we need a conversion factor. In this case, it is the molar mass of TiO₂: 79.87 g/mol.
1.28 × 10⁻⁵ mol TiO₂ × 79.87 g TiO₂/1 mol TiO₂ = 1.02 × 10⁻³ g TiO₂
which process is a chemical change
Concerning the disposal of materials at the end of the experiment, which methods are safe? Check all that apply.
[ANSWERS]
B. Dispose of pH paper in the trash.
C. Dump the cabbage indicator solution down the drain.
D. Ask your teacher to neutralize the acids and bases before disposal.
Answer:
B. Dispose of pH paper in the trash.
C. Dump the cabbage indicator solution down the drain.
D. Ask your teacher to neutralize the acids and bases before disposal.
Explanation:
Safe disposal of waste means disposal of waste in such a way that it does not pose a threat to the environment.
When pH paper is properly disposed in the trash, it does not constitute any risk to the environment.
When a cabbage indicator solution is disposed down the drain it does not contaminate the environment. It moves directly into the sewers and is properly disposed.
When acids and bases are properly neutralized before disposal, they don't lead to acid or base contamination of the environment.
4. At what temperature will 5.00 g of Cl, exert a pressure of 900. torr at a volume of 750 ml?
Answer:
p=27.8atm
Explanation:
P = 27.8atm
At what temperature will 5.00 g of Cl2 exert a pressure of 900. mmHg at a volume of 750.
Which of the following is an example of a molecular element?
a.NaCl b. CO2 c. Na d. O2
Answer:
oxygen (O2) is a molecular element
Explanation:
Molecular compound are chemical compounds that take the form of discrete molecules.
atomic element is an element which occurs independently as atoms and can react with other elements to form a compound
Ionic compounds are the compound which on dissolution form ions in solution
Mixture is the composition of different compounds
Identify two ways that temperature plays a role in chemical changes.
Answer:
Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.
Explanation:
what is electromagnetic?
Answer:
relating to the interrelation of electric currents or fields and magnetic fields.
Hot water is poured into four cups made of different materials (foam, glass, metal, plastic).After one minute, which will feel the warmest when you touch the OUTSIDE of the cup?
Answer:
Metal
Explanation:
Foam, glass, and plastic don't absorb as much heat as metal does.
What change would shift the equilibrium system to the left?
A(g) + B(s) + Energy = 309) (3 points)
Adding more of gas C to the system
Heating the system
Increasing the volume
Removing some of gas C from the system
Answer:
C
Explanation:
sorry if its wrong but i think its right
Heating the system will shift the equilibrium system to the left.
The correct option is B.
What is equilibrium?
Chemical equilibrium is a state where no net change in the amounts of reactants and the products occurs during a reversible chemical reaction.
A reversible chemical reaction happens when the products react with the original reactants as soon as they are generated.
On a treadmill, you are walking continuously but not going anywhere, which can be said as equilibrium.
Thus, the correct option is B.
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Consider the reaction.
2HF(g) +
H2(g) + F2(g)
At equilibrium at 600 K, the concentrations are as follows.
[HF] = 5.82 x 10-2 M
[H2] = 8.4 x 10-3M
[F2] = 8.4 x 10-3M
What is the value of Kea for the reaction expressed in scientific notation?
O 2.1 x 10-2
102.1 x 102
1.2 x 103
0 1.2 x 10-3
Answer:
0.021
Explanation:
Step 1: Write the balanced equation
2 HF(g) ⇄ H₂(g) + F₂(g)
Step 2: Calculate the value of the concentration equilibrium constant
The concentration equilibrium constant (K) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.
K for this reaction is:
K = [H₂] × [F₂] / [HF]²
K = (8.4 × 10⁻³) × (8.4 × 10⁻³) / (5.82 × 10⁻²)² = 0.021
Balloon has a volume of 600-ml at temperature of 360 K. If the temperature of
the balloon drops to 250 K, find the volume
Answer:
V₂ ≈416.7 mL
Explanation:
This question asks us to find the volume, given another volume and 2 temperatures in Kelvin. Based on this information, we must be using Charles's Law and the formula. Remember, his law states the volume of a gas is proportional to the temperature.
V₁ / T₁ = V₂ / T₂where V₁ and V₂ are the first and second volumes, and T₁ and T₂ are the first and second temperature.
The balloon has a volume of 600 milliliters and a temperature of 360 K, but the temperature then drops to 250 K. So,
V₁= 600 mL T₁= 360 K T₂= 250 KSubstitute the values into the formula.
600 mL /360 K = V₂ / 250 KSince we are solving for the second volume when the temperature is 250 K, we have to isolate the variable V₂. It is being divided by 250 K. The inverse o division is multiplication, so we multiply both sides by 250 K.
250 K * 600 mL /360 K = V₂ / 250 K * 250 K 250 K * 600 mL/360 K = V₂The units of Kelvin cancel, so we are left with the units of mL.
250 * 600 mL/360=V₂416.666666667 mL= V₂Let's round to the nearest tenth. The 6 in the hundredth place tells us to round to 6 to a 7.
416.7 mL ≈V₂The volume of the balloon at 250 K is approximately 416.7 milliliters.