Answer:
The ion that is formed when an acid is dissolved in a solution is OH-.
Explanation:
An acid is a molecule that donates hydrogen ions, or protons, to another molecule. In solution, the acid dissociates, or breaks apart, to form hydrogen ions and the negatively-charged anion of the acid. The anion of a typical acid is the molecule minus the hydrogen ions, so it is OH- for hydrochloric acid, HCl.
Question 7 (2 points)
A mocktail is a flavoured cocktail.
O True
O False
Answer:
false mocktail is liquor yea
What is the partial pressure (in mmHg) of oxygen in a sample of sea level air (a mixture
of oxygen, nitrogen, water vapor, carbon dioxide and other things) given the following
information?
P(N₂) = 0.72 atm P(H₂O) = 7.7 torr P(CO₂) = 0.37 mmHg P(other) = 0.97 kPa
The partial pressure of oxygen, P(O₂) is 198.83 mmHg.
What is partial pressure of a gas?The partial pressure of a gas is the pressure gas will exert in a mixture of gases which do not react chemically together.
The sum of partial pressure of gases at atmospheric pressure = 760 mmHg
P(N₂) + P(H₂O) + P(CO₂) + P(O₂) + P(other) = 760 mmHg
P(N₂) = 0.72 atm = 547.2 mmHg
P(H₂O) = 7.7 torr = 7.7 mmHg
P(CO₂) = 0.37 mmHg
P(other) = 0.97 kPa = 5.9 mmHg
P(O₂) = 760 - (547.2 + 7.7 + 0.37 + 5.9) = 198.83 mmHg
Therefore, the partial pressure of oxygen, P(O₂) is 198.83 mmHg.
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The diagram shows the apparatus used to separate pure water from impure water. What is the name of the name of this process? (Write one word only)
Distillation is the process which involves the separation of pure water from impure water.
What is Distillation?This is a technique which is used to purify through the boiling and cooling processes in the laboratory and typically involves the use of a liebig condenser.
Pure water is usually collected at 100° celsius with the impurities remaining and filtered out during the process. This is therefore the most apporpriate way of separating pure water from impure water.
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Electrons are always shared evenly during covalent bonding.
O True
False
Answer:
False
Explanation:
There are two types of covalent bonding: polar covalent boding and nonpolar covalent bonding. During polar covalent bonding, the electrons are not shared evenly. This is due to the electronegativity differences between the two atoms. During nonpolar covalent bonding, the electrons are shared evenly.
Two atoms interact with each other as shown by the equation. Complete the equation by filling in the missing parts.
The nuclear fission reaction with the formation of the deuterium has the missing part as ⁴₂He.
What is nuclear radiation?
Nuclear radiation is given as the reaction in which the emission is formed in the form of the nuclear particles that made the change in the nucleus of the atom.
The nuclear radiation that made the release of ₁¹H can be given to fuse the electron with the He and form:
²₁H + ³₂He →⁴₂He + ₁¹H
Thus, the missing part in the nuclear fission reaction is ⁴₂He.
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Which of the following statement is correct A.proton number of isotopes of an element is same B.proton number of elements are different C.mass number of isotopes and average atomic mass of elements are different D.all of these
The correct statement is Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.
What are isotopes?In a simple way to explain, Isotopes are species that have the same atomic number and mass number.
In this case, we can say that the correct statement is proton number of isotopes of an element is same.
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Based on your observations, relate the container from the simulation to a car airbag. What would happen to an inflatable airbag if air molecules were to be continuously added to it, similar to the container in the simulation?
If the molecules of air are added continuously to the inflatable bag of the car then the pressure of the molecule will decrease as given by Boyle's law.
What is Boyle's law?Boyle's law is a gas law that establishes the relation between the volume and the pressure of the gas. It states the inverse correlation between the two factors respective to the constant temperature.
Boyle's law is given as:
P₁V₁ = P₂V₂
Where an increase in the volume will decrease the pressure of the gas. So, if the air molecules are added to the bag then the pressure inside will reduce.
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A student determines that a 9.8 g mixture of MgCl₂ (s) and NaNO3(s) contains 0.050 mol of
MgCl₂(s).
Based on the student's measurement, what is the mass percent of Cl in the mixture?
mass MgCl₂ = mol x MM MgCl₂ = 0.05 x 95.211 g/mol = 4.76 g
mass Cl in MgCl₂ :
= (2 x AM Cl)/MM MgCl₂ x mass MgCl₂
= (2 x 35.5 g/mol)/95.211 g/mol x 4.76
= 3.55 g
% mass Cl in the mixture :
= (mass Cl / mass mixture) x 100%
= 3.55 / 9.8 x 100%
= 36.22%
In this experiment you’ll be grabbing the relationship between mass and volume you’ll be placing the volume on the X axis and the mass on the way access grabbing the data in this we will cause the slope of a linear regression have a special meaning
The mass and volume has direct proportional to each other.
What is the relationship between mass and volume?The volume of the object is directly proportional to its mass which means that if the volume increases the mass of the object increases also increase and vice versa. Due to this direct relationship, the line of regression will go straight between X and Y axis.
So we can conclude that mass and volume has direct proportional to each other.
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Think back to your three models of matter in parts A and B. Which model had a definite shape? Explain.
Answer:The first model (full container) represented matter that has a definite shape. The particles were packed tightly and did not have the freedom to rearrange themselves.
Explanation:
how mass affects the volume of the solid?
We can say that the volume of the object is directly proportional to its mass. As the volume increases the mass of the object increases in direct proportion. The gradient of the graph equals the density of the material.
What mass of silver nitrate, AgNO3, is needed to make 500.0 mL of 0.600 mol/L AgNO3(aq)?
50.97 g AgNO₃ is needed to make 500.0 mL of 0.600 mol/L AgNO3(aq)
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Molar mass of AgNO₃ = (107.9 + 14.0 + 16.0×3) g/mol = 169.9 g/mol
Molarity = Moles of solute ÷ Volume of solution in litre
0.600 mol/L = Moles of solute ÷ 0.5 mL
Moles of solute =0.3 mol
Moles =[tex]\frac{mass}{molar \;mass}[/tex]
0.3 mol = [tex]\frac{mass}{169.9 g/mol}[/tex]
Mass =50.97 g AgNO₃
Hence, 50.97 g AgNO₃ is needed to make 500.0 mL of 0.600 mol/L AgNO3(aq).
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Calculate the standard enthalpy change of reaction for b. 4HNO3(g) + 2H2O(g) → 2N2H4(g) + 7O2(g)
The enthalpy change for the reaction is 1215.75 kJ/mol.
What is enthalpy?The term enthalpy change is the energy that accompanies a reaction. Now we have the reaction; 4HNO3(g) + 2H2O(g) → 2N2H4(g) + 7O2(g)
ΔHf HNO3(g) = -134.31 kJ/mol
ΔHf H2O(g)= -241.83 kJ/mol
ΔHf N2H4(g) = 97.42 kJ/mol
ΔHf O2(g) = 0 kJ/mol
ΔHreaction = [(2 * 97.42) + ( 7 * 0)] - [ (4 * -134.31 ) + (2 * -241.83 )
= 194.84 - (-537.25 - -483.66)
=1215.75 kJ/mol
The enthalpy change for the reaction is therefore 1215.75 kJ/mol.
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A sample of gas has a temperature of 373 K and a volume 247 ml. If the temperature is increased to 473 K, what is the new volume?
A tank car contains of acetone (density = 0.785 g/cm3). What is the volume of a full tank car, in m3, which contains 3.22 x 104 kg of acetone?
show the work please!
Taking into account the definition of density, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Volume of a full tank carIn this case, you know that:
Density= 0.785 [tex]\frac{g}{cm^{3} }[/tex]mass= 3.22×10⁴ kg= 32,200,000 g (being 1 kg= 1000 g)Volume= ?Replacing in the definition of density:
[tex]0.785 \frac{g}{cm^{3} }=\frac{32,200,000 g}{volume}[/tex]
Solving:
volume×0.785[tex]\frac{g}{cm^{3} }[/tex]= 32,200,000 g
volume=[tex]\frac{32,200,000 g}{0.785 \frac{g}{cm^{3} }}[/tex]
volume= 41,019,108.28 cm³= 41.01910828 m³≅ 41.02 m³ (being 1 m³ = 1000000 cm³)
In summary, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.
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A car starts rest and gains velocity 20 m/s
in 10 second its acceleration
Answer:
2
Explanation:
final velocity: 20
initial velocity: 0
time taken: 10
acceleration: ?
a=( v-u)÷2
a=(20-0)÷2
a=20÷2
therefore acceleration =2
Feedback
Consult a peer or a family member about ways your design could be improved. Describe the feedback and provide the name of the reviewer. These are only suggestions that you can use to plan for Design Two. Use complete sentences and detailed examples.
l need this answer first one to get it gets brainlist
Explanation:
We gujra weeeeeeeeeeeeeee
We gujra weeeeeeeeeeeeeee
We gujra weeeeeeeeeeeeeee
We gujra weeeeeeeeeeeeeee
How much heat is required to melt 38.6 g of ice (0 degrees Celsius)? The heat of fusion for water is 6.02 kJ/mol.
Express your answer in kilojoules to three significant figures
Given the heat of fusion of water is 6.02 kJ/mol, it takes 12.9 kJ of heat to melt 38.6 g of ice at 0 °C.
What is fusion?Fusion, commonly known as melting, is a physical process in which matter passes from the solid to the liquid state.
We have ice with a mass of 38.6 g at 0 °C. First, we will convert mass to moles using the molar mass of water.
38.6 g × (1 mol/18.02 g) = 2.14 mol
The heat of fusion (ΔH°fus) for water is 6.02 kJ/mol. The heat (Q) required to melt 2.14 moles of ice is:
Q = 6.02 kJ/mol × 2.14 mol = 12.9 kJ
Given the heat of fusion of water is 6.02 kJ/mol, it takes 12.9 kJ of heat to melt 38.6 g of ice at 0 °C.
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On the box of a cake mix, the recipe says that it makes 24 cupcakes. When
the baker makes the cake mix, it only makes 16 cupcakes. What's the percent
yield of cupcakes?
%yield = actual/theoretical x 100%
%yield = 16/24 x 100%
% yield = 67%
How many moles of Li would react with 4 moles of MgBr₂ in the reaction
described by this chemical equation?
2Li + MgBr₂ → Mg + 2LiBr
-
A. 4
OB. 2
C. 8
D. 3
I NEED HELP ASAP PLEASE
Answer:
two may be the answer (2)
The students want to increase the volume of gas the pond weed makes in 5 minutes.
The students use a drinking straw to bubble some of their breath into the water.
The volume of gas the pond weed makes increases.
Explain why.
Answer: By blowing into the drinking straw to bubble some of their breath in the water, they are adding gas to the water. This will cause the volume of gas to increase.
The students want to increase the volume of gas the pond weed makes in 5 minutes. The students use a drinking straw to bubble some of their breath into the water. The volume of gas the pond weed makes increases because By blowing into the drinking straw to bubble some of their breath in the water, they are adding gas to the water.
This will cause the volume of gas to increase. One way the students could increase the volume of gas the pond weed makes in five minutes is by increasing light intensity. Pond weeds carry out photosynthesis to produce oxygen and light is an essential factor that affects rate of photosynthesis.
If light intensity is increased, more light energy will be available for plant to convert into chemical energy, which can be used in photosynthesis to produce more oxygen. This increases the volume of gas the pond weed makes in given time.
To increase the light intensity, students could move plant closer to a light source or use stronger light source.
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if you take a part time job while you are still in school what might your opportunity scost be
The opportunity costs of working part-time while attending high school could be studying time, grades, and your own free time. It depends on the person, how they do in school, but if it were for me, I would say the benefits outweigh the costs. I have enough time to study and still get good grades in school.
Answer:
I don't know I'm rich student
Explanation:
sorry
Determine which of the following elements would gain electrons when becoming ions: I. Hydrogen II. Helium III. Sulfur IV. Fluorine V. Gallium A. III and IV B. II, III, and IV C. I and V D. I and II
Hydrogen, iron, and gallium is the correct answer. Hence, option B is correct.
What is an electron?An electron is a negatively charged subatomic particle.
Let us take another look at the periodic table. The periodic table is composed of metals, metalloids and nonmetals.
Metals lose electrons more easily, that is why they form cations. Metals are found on the left-hand side of the periodic table.
As we move away from the left-hand side of the periodic table, the ability to form cations decreases as metallic character decreases and elements become more nonmetallic.
The noble gas helium rarely loses electrons. Fluorine would rather accept an electron to form a negative ion.
Hence, the elements hydrogen, iron and gallium are metals hence they lose electrons more easily.
Hence, option B is correct.
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The heat of combustion of CH4 is 890.4 KJ/mol, and the heat capacity of H20 is 75.2 J/molK. Find the volume of methane measured at 298K and 1.00 atm required to convert 1.00L of water at 298 K to water vapor at 373K.
Q methane = Q water
Q = mcΔt
mass water = V x ρ = 1 L x 1 kg/L = 1 kg
298 K to 373K = 25 °C to 100 °C
c water = 75.2 J/mol K = 4.2 J / g °C = 4200 J/kg °C
Q water = 1 x 4200 x (100 - 25)
Q water = 315000 J
Q methane = Q water = 315000 J = 315 KJ
n (mol) methane = ΔH/Q = 890.4 / 315 = 2.83
PV = nRT
V = nRT/P
V = 2.83 x 0.082 x 298/1
V = 69.15 L
Traveling at the speed of light - how long would it take, in years, to reach the top of the pile of balls? Show all calculations. The height of the pile is 1.10 x 10^14 km
The time taken for the object to reach to top of pile is 0.012 year.
Time of motionThe time taken for the object to reach to top of pile is calculated as follows;
time of motion = distance traveled/speed
time of motion = (1.1 x 10¹⁴ x 10³ m)/(3 x 10⁸ m/s)
where;
speed of light = 3 x 10⁸ m/stime of motion = 3.67 x 10⁵ sec = 0.012 year
Thus, the time taken for the object to reach to top of pile is 0.012 year.
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Pls help!!!!!
Tysm! Xxx
Answer:
Explanation:
The equation says for every 3 moles of barium chloride you can make 2 aluminum chloride.
(8/3)*2 = 5.33 moles
In an exothermic reaction, the _______ have more energy than the _________.
A. reactants, products
B. products, reactants
C. reactants, surroundings
D. None of these
In an exothermic reaction, the reactants have more energy than the products.
Gamma-ray bursters emit pulses of gamma rays with high energies. The frequency of the most energetic pulses has been measured at around 3.0x10 21 hz. What is the wavelength of the gamma rays
The wavelength of these gamma rays will be 1x1[tex]10^{-13}[/tex] m.
How do you define wavelength?
The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometres, and other units since it is a distance measurement.
The relationship between the wave's wavelength, frequency, and speed is given as
wavelength = speed of light ÷ frequency
wavelength = [tex]\frac{3 X10^8}{3.0 X10^{21}}[/tex]
wavelength = 1x[tex]10^{-13}[/tex] m
Hence the wavelength of these gamma rays will be [tex]1 X 10^{-13}[/tex]m.
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How many SO2 molecules are in 1.76 mol of SO2? How many sulfur atoms and oxygen atoms are there?
Answer:
1.76 * 6.02*10^23 = 1.05952*10^24
1.05952*2 = 2.11904 *10^24 oxygen and 1.05952*10^24 sulfur atoms
In 1.76 moles of SO₂, there are approximately 1.06 x 10²⁴ SO₂ molecules, 1.06 x 10²⁴ sulfur atoms, and 2.12 x 10²⁴ oxygen atoms. For determining the number of SO₂ molecules, sulfur atoms, and oxygen atoms in 1.76 moles of SO₂, we need to use Avogadro's number, which is approximately 6.022 x 10²³ particles per mole.
1 mole of any substance contains Avogadro's number of particles, which includes atoms or molecules. Therefore, to find the number of SO₂ molecules in 1.76 moles, we can multiply 1.76 moles by Avogadro's number:
Number of SO₂ molecules = 1.76 moles × Avogadro's number
Number of SO₂ molecules = 1.76 moles × 6.022 x 10²³ molecules/mol
Number of SO₂ molecules ≈ 1.06 x 10²⁴ molecules
Next, we can find the number of sulfur atoms and oxygen atoms in 1.76 moles of SO₂. In one molecule of SO₂, there is 1 sulfur atom and 2 oxygen atoms. So, the total number of sulfur atoms and oxygen atoms can be calculated as follows:
Number of sulfur atoms = Number of SO₂ molecules × 1 sulfur atom/molecule
Number of sulfur atoms = 1.06 x 10²⁴ molecules × 1 sulfur atom/molecule
Number of sulfur atoms ≈ 1.06 x 10²⁴ sulfur atoms
Number of oxygen atoms = Number of SO₂ molecules × 2 oxygen atoms/molecule
Number of oxygen atoms = 1.06 x 10²⁴ molecules × 2 oxygen atoms/molecule
Number of oxygen atoms ≈ 2.12 x 10²⁴ oxygen atoms
So, in 1.76 moles of SO₂, there are approximately 1.06 x 10²⁴ SO₂ molecules, 1.06 x 10²⁴ sulfur atoms, and 2.12 x 10²⁴ oxygen atoms.
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The freezing point of pure water is 0.0°C. How many grams of ethylene glycol (C2H6O2) must be mixed in 100.0 g of water to lower the freezing point of the solution to -4.3°C?
_______ g
The mass of the ethylene glycol used is 14.26 g
What is the freezing point?The freezing point is the temperature at which a liquid is converted to a solid.
Given that;
ΔT = 0.0°C - ( -4.3°C) = 4.3°C
ΔT = 4.3°C
But we know that
ΔT = k m i
m = ΔT/k i
m = 4.3°C/1.86 °C/m * 1
m = 2.3 m
Now;
Let the mass of ethylene glycol be m
Molar mass of ethylene glycol = 62 g/mol
Mass of solvent = 100.0 g or 0.1 Kg
Then;
2.3= m/62/0.1
2.3 = m/62 * 0.1
m = 2.3 * 62 * 0.1
m = 14.26 g
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