Answer:
Repulsion Forces create the bent triatomic shape of a water molecule.
Carbon dioxide subliming is an example of which of the following?
O A. Mass change
O B. Chemical change
O C. Nuclear change
O
D. Physical change
Final answer:
Carbon dioxide subliming is a physical change, which is a phase transition from solid to gas without altering the substance's molecular structure.
Explanation:
Carbon dioxide subliming is an example of a physical change. Sublimation is the process where a substance changes from a solid to a gas without going through the liquid phase. In this case, solid carbon dioxide (also known as dry ice) directly becomes carbon dioxide gas. During sublimation, there is an energy change associated with the phase change, but the molecular structure of the substance does not change. Therefore, sublimation is categorized as a physical change rather than a chemical change or any other type of change like mass or nuclear.
Carbon dioxide subliming, which is the direct phase change from solid to gas, is an example of a physical change. Sublimation occurs when a compound's vapor pressure equals its applied pressure, and most solids do not easily sublime unless they have weak intermolecular forces.
5. A penny weighs about 2.5 g. How many moles of pennies would be required to equal the mass of the moon (7.3x10^24 kg)
6. Vodka is 40% ethanol. How many moles of ethanol are in a 750 ml bottle of vodka? The density of Ethanol is 0.79 g/ml.
5. 1.16 x [tex]10^{26}[/tex] moles moles of pennies would be required to equal the mass of the moon.
6. 12.86 moles of ethanol are in a 750 ml bottle of vodka.
Explanation:
5 .Data given:
mass of penny = 2.5 grams
atomic mass of penny = 62.93 grams/mole
moles present in mass of the moon given as = 7.3 x [tex]10^{24}[/tex] kg
number of moles = [tex]\frac{mass}{atomic mass of 1 mole}[/tex]
number of moles = [tex]\frac{2.5}{62.93}[/tex]
0.039 moles of penny is present in 2.5 grams
0.039 moles of penny in 2.5 grams of it
so, x moles in 7.3 X [tex]10^{27}[/tex] grams
[tex]\frac{0.039}{2.5} =\frac{x}{7.3 X 10^{27} }[/tex]
x = 1.16 x [tex]10^{26}[/tex] moles
so when the mass of the penny given is equal to the mass of moon, number of moles of penny present is 1.1 x [tex]10^{26}[/tex] .
6.
Given:
vodka = 40% ethanol
volume of vodka bottle = 750 ml
moles of ethanol =?
density of ethanol =0.79 g/ml
atomic mass of ethanol = 46.07 grams/mole
so, from the density of ethanol given we can calculate how much ethanol is present in the solution.
density = [tex]\frac{mass}{volume}[/tex]
density x volume = mass
0.79 x 750 = 592.5 grams
number of moles = [tex]\frac{mass}{atomic mass of 1 mole}[/tex]
number of moles of ethanol = [tex]\frac{592.5}{46.07}[/tex]
= 12.86 moles of ethanol
In a laboratory experiment, the freezing point of an aqueous solution of glucose is found to be -0.325°C, What is the molal concentration of this solution?
0.17 M is the is the molal concentration of this solution
Explanation:
Data given:
freezing point of glucose solution = -0.325 degree celsius
molal concentration of the solution =?
solution is of glucose=?
atomic mass of glucose = 180.01 grams/mole
freezing point of glucose = 146 degrees
freezing point of water = 0 degrees
Kf of glucose = 1.86 °C
ΔT = (freezing point of solvent) - (freezing point of solution)
ΔT = 0.325 degree celsius
molality =?
ΔT = Kfm
rearranging the equation:
m = [tex]\frac{0.325}{1.86}[/tex]
m= 0.17 M
molal concentration of the glucose solution is 0.17 M
The molal concentration of an aqueous glucose solution with a freezing point of -0.325°C is 0.175 mol/kg, calculated using the freezing point depression formula.
To find the molal concentration of the aqueous solution of glucose, we can use the formula for the freezing point depression ΔTf = i * Kf * m, where ΔTf is the change in freezing point, i is the van 't Hoff factor (which is 1 for a non-electrolyte like glucose), Kf is the freezing point depression constant for water (1.86°C/m), and m is the molality of the solution. Given that the freezing point of the solution is -0.325°C and the freezing point of pure water is 0.0°C, ΔTf = 0.0°C - (-0.325°C) = 0.325°C. Now, we can solve for molality (m).
ΔTf = (1) * (1.86°C/m) * m => 0.325°C = 1.86°C/m * m
Therefore, m = 0.325 °C / 1.86 °C/m = 0.175 mol/kg, which is the molal concentration of the glucose solution.
What quantity is shown by the slope?
the mass of a fluid
the volume of a fluid
the weight of a fluid
the density of a fluid
Answer:
density of a fluid
Explanation:
You add 31.65 g of a non-electrolyte solute to 220.0 mL of water to cook Mac and Cheese. How much hotter will the water be? The molar mass of the solute is 180.18 g/mol and the density of water is 1.0 g/m
a) 0.004072^{\circ}C
b) 100.4^{\circ}C
c) 73.37^{\circ}C
d) 0.4072^{\circ}C
100.4 degree celsius is the temperature of the water having non-electrolyte.
The correct answer is b.
Explanation:
Data given:
mass of non-electrolyte solute = 31.65 grams
volume of water = 220 ml or 0.22 litres
molar mass of solute = 180.18 grams/mole
density of water = 1 gm/mole
Boiling point of water = 100 degrees celsius
molality = ?
Kb for water = 0.51
boiling point elevation or temperature of hot water,T =?
Formula used:
T = mKb equation 1
number of moles of non electrolyte = [tex]\frac{31.65}{180.18}[/tex]
number of moles = 0.17 moles
molality = [tex]\frac{0.17}{0.22}[/tex]
molality = 0.77 M
putting the values in equation 1
T = 0.77 X 0.51
T = 0.392 degree celsius. is the elevation in temperature when solute is added.
Temperature of the hot water = 100 +0.392
= 100.392 degree celsius.
Which type of decay does not involve the decaying atom's atomic number to change?
a) alpha decay
b) beta decay
c) gamma decay
d) delta decay
please help me
Answer:
c-gamma decay
Explanation:
In gamma decay, neither the atomic number or the mass number is changed
Why did Boyle think that chemistry was the key to understanding?
Answer:
Explanation:
Boyle believed that chemistry – the behavior of substances – could be explained through the motion of atoms, which in turn could be understood through mechanics – Galileo's mathematics of motion. Boyle was ultimately proved correct, because today we can understand chemistry mathematically, through quantum mechanics.
help, timed assignment
Answer:
B
Explanation:
ALL CELLS USE CELLULAR RESPIRATION
Which of the following compounds will behave MOST like an ideal gas at higher pressures? a) He b) SO2 c) H2 d) N2 e) F2
Answer:
Option A
He
Explanation:
Ideal gas: refers to a type of gas having a perfectly elastic collisions between atoms or molecules with no intermolecular attractive forces. Helium is the most ideal gas amongst the given options because it exists as a single atom, with a low boiling point with a very low or even zero intermolecular interaction.
SO2 is less volatile having more intermolecular interaction (van da waal interaction, this is the reason for it's deviation from ideality).
H2 almost behaves like an idea gas because it has a low intermolecular interaction not zero.
N2 is not an ideal gas
F2 is not the most ideal gas.
Final answer:
Helium (He)- (a) is most likely to behave like an ideal gas at higher pressures due to its minimal intermolecular forces and very small atomic radius, which make its behavior under such conditions closer to the assumptions of the ideal gas law.
Explanation:
The compound that will behave most like an ideal gas at higher pressures is helium (He). Ideal gas behavior assumes that there are no intermolecular forces between the gas particles and that the volume of the gas particles themselves is negligible compared to the container. Helium, being a noble gas with a single atomic structure, has minimal intermolecular forces and a very small atomic radius, making it less likely to deviate from ideal behavior even at higher pressures. Furthermore, helium's atoms are significantly smaller than molecules like SO₂, H₂, N₂ or F₂, which means that the volume the particles take up is less significant. Real gases such as SO₂ and F₂ have stronger intermolecular forces due to their larger size and molecular structure, which will cause these gases to deviate from ideal gas behavior more than helium under the same conditions. Therefore, amongst the options provided, helium will behave most similarly to an ideal gas at higher pressures.Study the diagram, which represents the general equation
for photosynthesis,
What do the letters Y and Z represent?
Y - glucose
Z-oxygen
Y - glucose
Z-carbon dioxide
Y - carbon dioxide
Z - hydrogen
Y - carbon dioxide
Z - oxygen
It’s glucose and oxygenAnswer:
Explanation:
Answer:
Y - glucose Z - oxygen
Explanation:
0.25 miles of sodium chloride is dissolved to make 0.05 liters of solution. What is the molarity
A: 2 M
B: 5 M
C: 4 M
D: 3 M
Libby has a mass of 45 kg in space, her mass would be:
More than 45 kg
Exactly 45 kg
Less than 45 kg
At what temperature (°C) will a 10.00 g sample of neon gas exert a pressure of 96.7 kPa in a
9.50 L container?
Answer : The temperature of neon gas will be, 221.0 K
Explanation :
To calculate the temperature of neon gas we are using ideal gas equation.
[tex]PV=nRT\\\\PV=\frac{w}{M}RT[/tex]
where,
P = pressure of neon gas = 96.7 kPa = 0.955 atm
Conversion used : (1 atm = 101.3 kPa)
V = volume of neon gas = 9.50 L
T = temperature of neon gas = ?
R = gas constant = 0.0821 L.atm/mole.K
w = mass of neon gas = 10.00 g
M = molar mass of neon gas = 20 g/mole
Now put all the given values in the ideal gas equation, we get:
[tex](0.955atm)\times (9.50L)=\frac{10.00g}{20g/mole}\times (0.0821L.atm/mole.K)\times T[/tex]
[tex]T=221.0K[/tex]
Therefore, the temperature of neon gas will be, 221.0 K
To find the temperature at which a 10.00 g sample of neon gas will exert a pressure of 96.7 kPa in a 9.50 L container, we can use the ideal gas law. After all the calculations, the temperature comes out to be approximately -52 °C.
Explanation:The temperature at which a 10.00 g sample of neon gas will exert a pressure of 96.7 kPa in a 9.50 L container can be calculated using the ideal gas law, which is PV = nRT. Here, P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
First, let's convert the weight of Neon into moles by using the molar mass of Neon (20.18 g/mol). So, n = 10.00 g / 20.18 g/mol = 0.495 moles. The R value that corresponds to the units of pressure (kPa) and volume (L) we're using is 8.3145 L.kPa/K.mol. Now, we can solve the equation for the temperature: T = PV/nR = (96.7 kPa * 9.50 L) / (0.495 mol * 8.3145 L.kPa/K.mol) = 221.5 K.
Since the question asks for the temperature in °C, we need to convert Kelvin to Celsius by subtracting 273.15: T = 221.5 K - 273.15 = -51.65 °C. Therefore, a 10.00 g sample of neon gas will exert a pressure of 96.7 kPa in a 9.50 L container at approximately -52 °C.
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If I have 0.75 moles of gas at a temperature of 105 K and a pressure of 3.75 atmospheres, what is the volume of the gas
Answer:
the volume is 20 just subtract
Explanation:
In one of your trials you placed 5.5 grams of salt in 10 ml of water. Use this information to answer the following questions.
a. What is the w/w%?
b. What is the w/v%
c. How many moles of NH4Cl are used? Remember, moles = mass/molar mass
d. Using the moles from 4c find the molarity.
Answer:I think it is C not positive though
Explanation:
In one of your trials you placed 5.5 grams of salt in 10 ml of water. (a) The w/w % is 35.48% (b) The w/v % is 55 % (c) The moles of NH₄Cl is 0.1 mol (d) The molarity of solution is 10 M.
How to calculate the percentage concentration (w/w) ?Concentration % (w/w) = [tex]\frac{\text{Weight of solute}}{\text{Weight of solution}} \times 100[/tex]
Weight of solution = Solute + Solvent
= 5.5 g + 10g [ 1 ml water = 1 g water]
= 15.5
Concentration % (w/w) = [tex]\frac{\text{Weight of solute}}{\text{Weight of solution}} \times 100[/tex]
= [tex]\frac{5.5}{15.5} \times 100[/tex]
= 0.3548 × 100
= 35.48 %
How to calculate the percentage concentration (w/v) ?
Concentration %(w/v) = [tex]\frac{\text{Mass of solute (in g)}}{\text{Volume of solution (in ml)}} \times 100[/tex]
= [tex]\frac{5.5}{10} \times 100[/tex]
= 55%
How to find the number of mole ?To calculate the number of moles of a substance we have to divide the given mass/weight of the substance by the molar mass of the substance.
Moles = [tex]\frac{\text{Given Mass}}{\text{Molar mass }}[/tex]
= [tex]\frac{5.5}{53.5}[/tex]
= 0.1 mol
What is Molarity ?Molarity (M) is defined as the number of solute dissolved in per liter of solution.
Molarity (M) = [tex]\frac{\text{Number of moles of solute}}{\text{Volume of solution (in liters)}}[/tex]
Convert ml into l
1 ml = 0.001 liter
10 ml = 10 × 0.001
= 0.01 liter
Now put the value in above formula we get
Molarity (M) = [tex]\frac{\text{Number of moles of solute}}{\text{Volume of solution (in liters)}}[/tex]
= [tex]\frac{0.1}{0.01}[/tex]
= 10 M
Thus from the above conclusion we can say that In one of your trials you placed 5.5 grams of salt in 10 ml of water. (a) The w/w % is 35.48% (b) The w/v % is 55 % (c) The moles of NH₄Cl is 0.1 mol (d) The molarity of solution is 10 M.
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How many moles of argon are in 30.6L at 28K and 658 mmHg?
Answer : The number of moles of argon gas is, 11.5 mol
Explanation :
To calculate the moles of argon we are using ideal gas equation as:
[tex]PV=nRT[/tex]
where,
P = pressure of argon gas = 658 mmHg = 0.866 atm (1 atm = 760 mmHg)
V = volume of argon gas = 30.6 L
n = number of moles of argon gas = ?
R = gas constant = 0.0821 L.atm/mol.K
T = temperature of argon gas = 28 K
Now put all the given values in the above formula, we get:
[tex](0.866atm)\times (30.6L)=n\times (0.0821 L.atm/mol.K)\times (28K)[/tex]
[tex]n=11.5mol[/tex]
Therefore, the number of moles of argon gas is, 11.5 mol
If I dissolve sugar in water, what is the solution?
Answer:
When you stir a spoonful of sugar into a glass of water, you are forming a solution. This type of liquid solution is composed of a solid solute, which is the sugar, and a liquid solvent, which is the water. As the sugar molecules spread evenly throughout the water, the sugar dissolves.
How would you identify distance traveled on a line
Answer:
depends how long the line is
Explanation:
if the line is short then the distance is short if its long then the distance is long
If a tree stops producing nuts in the winter, what might a chipmunk do to adapt?
Answers:
1: Find another food source
2: Lose fur
3: Build a nest
4: Change fur color
Answer:
Find another food source
Explanation:
They should Find another tree or food soure
Are gases more or less dense than liquids or solids at room temperature?
Answer:
less denser
Explanation:
soild
solid (steel) is the most dense,
gas
the gas (air) is the least dense
liquid
the density of the liquid (water) is in between
ZnCl2 is used in soldering flux, an alloy used to join two metals together. Determine the moles of Cl- ions in 2.50 mol ZnCl2.
5.00 mol Cl-
0.500 mol Cl-
1.75 mol Cl-
15.0 mol Cl-
Answer : The number of moles of [tex]Cl^-[/tex] ions are, 5.00 mole.
Explanation :
When 1 mole of [tex]ZnCl_2[/tex] dissociates then it gives 1 mole of [tex]Zn^{2+}[/tex] ion and 2 moles of [tex]Cl^-[/tex] ions.
As we are given that there are 2.50 mole of [tex]ZnCl_2[/tex].
Now we have to determine the number of moles of [tex]Cl^-[/tex] ions.
As, 1 mole of [tex]ZnCl_2[/tex] dissociate to give 2 moles of [tex]Cl^-[/tex] ions.
So, 2.50 mole of [tex]ZnCl_2[/tex] dissociate to give [tex]2\times 2.50=5.00[/tex] moles of [tex]Cl^-[/tex] ions.
Therefore, the number of moles of [tex]Cl^-[/tex] ions are, 5.00 mole.
There are 5.00 moles of Cl- in 2.50 moles of ZnCl2.
We have that the amount of moles of ZnCl2 is equal to 2.50 moles, so, according to the equation that forms this compound we can say that:
[tex]Zn + 2Cl[/tex] ⇒[tex]ZnCl_{2}[/tex]
So, 1 mole ZnCl2 of decomposes as 1 Zn ion and 2 Cl ions, that is, the number of moles of chlotide is twice the number of moles of ZnCl2:
[tex]2 \times 2.50 = 5.00 moles[/tex]
So, there are 5.00 moles of Cl- in 2.50 moles of ZnCl2.
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Julissa combined baking soda and calcium chloride solution in a beaker. she observed bubbling and a white solid formed. Julissa completed the reaction again after warming the solutions. What changes will julissa most likely see in the warmer reaction.?
A) The bubbling and white solid formation would occur faster
B)The bubbles and white solid formation would happen slower
C) The bubbling or white solid formation would not be created at all
D) Only the bubbling would occur, but no white solid particles would from.
(50 points pls help)
Answer:
A
Explanation:
With chemical reactions, there are various factors that affect the rate of the reaction. One of these is temperature.
When you raise the temperature, the reaction will move faster. Why? Temperature is directly correlated with the kinetic energy (basically, the energy that makes the particles move). Higher temperatures mean higher kinetic energies. Particles with higher kinetic energies move faster, which makes them more likely to collide. When collisions occur more frequently, the reaction follows through more quickly.
Thus, when Julissa warms the solutions, she will see that bubbling and white solid formation (the products of the reaction) occus faster. So, the answer is A.
Hope this helps!
Which of the scientists responsible for cell theory would be the most likely to write a book titled Cells Come from Cells?
Hooke
Schleiden
Virchow
Schwann
Answer:
I am not sure but DO NOT PICK SCHWANN.
Explanation:
That other person is wrong. Maybe it is Virchow. Sorry if I am wrong.
The scientist most likely to write a book titled 'Cells Come from Cells' is Rudolf Virchow, as he popularized the idea that all cells arise from pre-existing cells.
Explanation:The scientist most likely to write a book titled Cells Come from Cells is Rudolf Virchow. Virchow is known for popularizing the concept that all cells arise from pre-existing cells, an idea that greatly contributed to the development of the modern cell theory. This statement became known as `Virchow's Law' or 'Omnis cellule e cellula', which means 'every cell comes from a cell'.
Other scientists such as Hooke, Schwann, and Schleiden made key contributions to the cell theory as well, but their work focused on different aspects. Hooke, for example, first identified and named cells, but did not propose their mode of formation. Similarly, Schwann and Schleiden identified that both plants and animals are made up of cells.
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What type of simple machine is found on a water bottle cap
Answer:
A Lever
Explanation:
15. How many grams of sulfur are in 8.5 moles of S?
12.0 of .500 M NaOH neutralized 6.0 ml of HCl solution. What was the molarity of the HCl
The molarity of the HCl is 1 M when 12.0 of .500 M NaOH neutralized 6.0 ml of HCl solution.
Explanation:
Data given:
molarity of the base NaOH, Mbase =0. 5 M
volume of the base NaOH, Vbase = 12 ml
volume of the acid, Vacid = 6 ml
molarity of the acid, Macid = ?
The titration formula for acid and base is given as:
Mbase Vbase = Macid Vacid
Macid =[tex]\frac{0. 5 X 12}{6}[/tex]
Macid = 1 M
we can see that 1 M solution of HCl was used to neutralize the basic solution of NaOH. The volume of NaOH is 12 ml and volume of HCl used is 6ml.
How do particles in matter change when a substance becomes hotter, cool down, or changes state?
Answer:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
hope this helps!!!!!!
When a substance gets hotter, its particles move faster and spread out, causing it to expand. When it cools down, its particles slow down and come closer together, which causes it to contract. When a substance changes state, the arrangement and movement of its particles also change in a significant way.
Explanation:The particles of matter are always moving. When a substance becomes hotter, its particles move faster and generally spread out, resulting in an increase in volume. This is often referred to as thermal expansion.
When a substance cools down, its particles move slower and come closer together, which usually means a decrease in volume. This is called contraction.
When a substance changes state, the arrangement and movement of particles change significantly. For example, when water (a liquid) freezes into ice (a solid), its particles slow down and take on a fixed, orderly pattern. When ice melts back into the water, its particles speed up and move past each other more freely. When water boils into steam (a gas), its particles move even faster and are much further apart.
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You hold a handful of rocks and a handful of feathers. The rocks feel heavier than
the feathers, even though you hold the same amount of both. Which of the following is true?
a) The rocks have more mass, and therefore contain more matter, than the
feathers.
b) The feathers have more mass, and therefore contain more matter, than the
rocks.
c) The rocks and feathers have the same mass.
d) The rocks and feathers have the same amount of matter.
Answer:
a) The rocks have more mass, and therefore contain more matter, than the
feathers.
Explanation:
Final answer:
The correct answer is that rocks have a greater mass and contain more matter than an equal volume of feathers, making them feel heavier. This illustrates the concept of mass versus density in physics.
Explanation:
The question involves comparing the mass and density of two different materials and understanding their properties in terms of physics. When you hold the same volume of rocks and feathers, the rocks feel heavier because they have a greater mass and density than the feathers. This is similar to the old riddle about whether a ton of feathers or a ton of bricks weighs more, which serves to illustrate that while the mass — a measure of how much matter is in an object — is the same for both (a ton is a ton), the density of the bricks is much higher. Density is the mass per unit volume, and since bricks are denser than feathers, a given volume of bricks will weigh more than the same volume of feathers.
Answering the student's question directly, option a) The rocks have more mass, and therefore contain more matter, than the feathers. is the correct choice. The rocks, having more mass, will have more matter in the same volume when compared to feathers, which is why rocks feel heavier.
Which of the following systems has potential energy only?
Select one:
a car screeching to a halt
an airplane flying above
a stone falling off a cliff
a bird sitting on a branch
Answer:
a bird sitting on a branch
How many moles are in 23.4 g
Answer:
0.211 mol CaCI2
Explanation:
on edge
The molar mass of nitrogen gas N₂ is 28 g/mol. Thus, the number of moles present in 23.4 g is 0.83 moles.
What is dinitrogen?Nitrogen is 7the element in periodic table. It exists in diatomic state or molecular state as N₂ gas. Two nitrogen atoms are covalently bonded together through sharing of three electrons each.
One mole of any element contains 6.022 × 10²³ atoms. This number is called Avogadro number. The mass of one mole of a substance is called its molar mass.
The atomic mass of N is 14 g/mol. Thus, for N₂ the mass is 28 g/mol. Hence, one mole of nitrogen gas weighs 28 g. The number of moles in 23.4 g of N₂ is calculated as follows:
Number of moles = weight / molar mass
= 23.4 g/28 g/mol
= 0.83 moles.
Therefore, the number of moles of N₂ in 23.4 g is 0.83.
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Your question is incomplete. But your complete question probably was:
How many moles are in 23.4 g of N₂.