The mass of cesium fluoride which is required to make 73.1 g of cesium xenon heptaflouride is 27.6 grams.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, where
W = given massM = molar massMoles of CsXeF₇ = 73.1g / 397g/mol = 0.184mol
Given chemical reaction is:
CsF + XeF₆ → CsXeF₇
From the stoichiometry of the reaction, it is clear that:
0.184 moles of CsF required = to react with 0.184 moles of CsXeF₇
Now we convert this moles of CsF into mass as:
W = (0.184mol)(150g/mol) = 27.6 g
Hence required mass of CsF is 27.6g.
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Frosted glass and wax paper are ____.
A) transparent
B) translucent
C) clear
D) opaque
Answer:
B) translucent
Explanation:
Light only partially passes through them.
Which of these is a conversion from chemical energy to mechanical energy?
A. A dark light bulb starting to glow
B. A ball rolling down a hill
C. A person lifting a weight
D. A potato being heated in an oven
Answer:
C . A person lifting a weight
A plant was placed in the corner of a room away from a window. What might you observe about the plant after five days?
Select one:
The plant is leaning toward the window.
The plant is not affected by the light in the window.
The plant is standing straight up from the pot.
The plant is leaning away from the window.A plant was placed in the corner of a room away from a window. What might you observe about the plant after five days? Select one: The plant is leaning toward the window. The plant is not affected by the light in the window. The plant is standing straight up from the pot. The plant is leaning away from the window.
Answer:
1. A. The plant leans toward window.
Explanation:
Plants need light to perform photosynthesis and live. Therefore, this means the plant will always lean toward light in order to survive.
- Hope that helps! Please let me know if you need further explanation.
Answer
Last one I think
Explanation:
Density of ethanol is .789g/ml if ethanol were placed in water then which substance would form a layer on top of the container
Answer:
ethanol
Explanation:
Can somebody please help me with these ? how many moles of AI are needed to react with 6 moles of O2?
Answer:
idkidkdkdkkdkdkdkddk
beudud
Explanation:
lolwoeo3i3iieieiekeididdo
Body systems such as the nervous and digestive systems work together and help the body
maintain homeostasis. Which of the following correctly describes one way that the nervous
system and the digestive system work together?
Lungs contract during chewing so that food won't be inhaled.
Blood flow to the stomach and intestines decreases during eating.
The involuntary muscles in the jaw stimulate spinal cord neurons to initiate chewing.
Neurons in the brain stimulate smooth muscles in the intestines to move food through the body.
Where does your body get the energy needed to transform into kinetic energy to move around all day
Answer:
food, mostly consists of what you eat.
Explanation:
The body get the energy needed to transform into kinetic energy from food.
Food:Every body part (muscles, brain, heart, and liver) need energy to work. This energy comes from the food we eat. Our bodies digest the food we eat by mixing it with fluids (acids and enzymes) in the stomach.
The main sources of energy are: carbohydrates, lipids, and proteins.
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new evidence can lead to a change in scientific knowlodge
true or false
Answer:
true
Explanation:
Answer:
True, new evidence can lead to a change in scientific knowledge.
Explanation:
0.450 moles of K2SO4 are dissolved in 195.0 mL of water. Calculate the molarity of the solution.
Answer:
2.31M
Explanation:
The following data were obtained from the question:
Mole of K2SO4 = 0.450 mole
Volume of water = 195.0 mL = 195/1000 = 0.195L
Molarity =...?
Molarity is defined as the mole of solute per unit litre of the solution. This can be expressed as:
Molarity = mole /Volume
With the above formula we can calculate the molarity of the K2SO4 solution as follow:
Molarity = mole /Volume
Molarity = 0.450/0.195
Molarity = 2.31M
If 5.4 g of NaNO3 is dissolved in 350 mL of water, what is the molarity of the solution?
Answer:
0.18 Moles
Explanation:
first you need to convert the 5.4g to moles using molar mass
[tex](\frac{5.4g}{1})(\frac{1mol}{84.99g} )=\frac{5.4g}{84.99g} =0.0635mol NaNO_{3}[/tex])
once you have that done you can use the molarity equation to get the answer
[tex]M=\frac{0.0635mol}{0.350ml} =0.181428[/tex]
now you need to round to the correct sig fig which will give you the correct answer of 0.18moles
Which of the following is a chemical reaction?
1- Dropping a sliced orange into a vat of Sodium Dydroxide
2-Cutting a piece of paper into two pieces
3-Filling a balloon with air
4-Freezing liquid Mercury
Answer:
1- Dropping a sliced orange into a vat of Sodium Dydroxide
Explanation:
The other answers (2-4) are only physical changes that don't change any chemical compositions.
A gas occupies a volume of 2.45 L at a pressure of 1.03 atm. What volume will the
gas occupy if the pressure changes to 0.980 atm and the temperature remains
unchanged? Show your work in the space below. *
Answer:
2.58 L
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
At constant temperature, if the pressure of the gas decreases to the given value, the volume increases to 2.58L.
What is Boyle's law?Boyle's law simply states that "the volume of any given quantity of gas is inversely proportional to its pressure as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given the data in the question
Initial volume V₁ = 2.45LInitial pressure P₁ = 1.03atmFinal pressure P₂ = 0.980 atmFinal volume V₂ = ?P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
V₂ = ( 1.03atm × 2.45L ) / 0.980atm
V₂ = 2.5235Latm / 0.980atm
V₂ = 2.58L
Therefore, at constant temperature, if the pressure of the gas decreases to the given value, the volume increases to 2.58L.
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Explain the different principles that allow roller coasters to rip and roar around the tracks. In your response, include how energy is transferred back and forth between kinetic and potential.
Answer:
In the roller coasters the potential energy that is given is the gravitational potential energy, which this energy increases its value as the object moves away from the earth, that is to say, the more height the roller coaster acquires the more gravitational potential energy it will have, and Said train where people usually get on the roller coaster will descend or descend with greater acceleration.
This gravitational potential energy once the mountain begins to descend or descend is converted into kinetic energy
Explanation:
This that we wrote above is considering that the roller coaster does not have curved routes but rectilinear, in the case that it had curved routes, a force would be added in addition to those written that is the centripetal force, it is the same force that appears in the centrifuges or dryers of clothes or the same washing machine. This force, the centripetal force is the force that draws a moving object, in a curvilinear path, towards the center of the curvature.
I WILL GIVE BRAINLIEST PLEASE HELP
How many moles of NH₃ are needed to react in order to form 660. g (NH₄)₂SO₄ according to the following balanced equation: 2 NH₃ + H₂SO₄ --> (NH₄)₂SO₄ *
Answer:
10moles of NH₃ will produce 660g of (NH₄)₂SO₄
Explanation:
Equation of reaction:
2NH₃ + H₂SO₄ → (NH₄)₂SO₄
2 mole of NH₃ = 1 Mole of (NH₄)₂SO₄
Molar mass of NH₃ = [14 + (3*1)] = 17g/mol
Number of moles = mass / molarmass
Mass = number of mole * molarmass
Mass = 2 * 17 = 34g
Molar mass of (NH₄)₂SO₄ = [(14 + 4)*2 + (32 + 64)
Molar mass of (NH₄)₂SO₄ = 132g/mol
Mass = molar mass * number of moles
Mass = 132 * 1 = 132g
From the equation of reaction,
34g of NH₃ will produce 132g of (NH₄)₂SO₄
34g of NH₃ = 132g of (NH₄)₂SO₄
X g of NH₃ = 660g of (NH₄)₂SO₄
X = (34*660) / 132
X = 170g of NH₃
170g of NH₃ will produce 660g of (NH₄)₂SO₄
Number of moles = mass / molarmass
Molar mass of NH₃ = 17g/mol
Number of moles = 170 / 17
Number of moles = 10moles
Therefore 10moles of NH₃ will produce 660g of (NH₄)₂SO₄
In which two ways can the timber industry help prevent loss of forest cover and animal habitats?
Answer:
Cut trees at a sustainable rate
and
Plant one tree for every tree that is cut.
hope i helped, if i could get brainliest that would be great
What is one thing NOT impacted by Acid
Rain.
Granite
Metal
Limestone
Consider this reaction:
N2 (g) + 3H2 (9) = 2 NH3 (9). If Q ea, which statement is true?
O A.
The reaction will move forward.
B.
The reaction will move in reverse.
C.
The concentration of the product should decrease.
D.
The concentrations of the reactants should increase.
E.
The reaction is in equilibrium.
Answer:
Explanation:
its E
trust me i got a 100
Answer:
E. The Reaction Is In Equilibrium.
Explanation:
Plato Answer
The mole concept will most likely be used in
calculating the average height of a mountain range.
measuring how many liters of gasoline are poured into a tank.
determining how many ozone molecules are lost in the atmosphere.
finding the mass of a piece of steak in a butcher shop.
Answer:
determining how many ozone molecules are lost in the atmosphere
Pls Mark as Brainliest!!! if this helps...
The mole concept The mole concept can be used to determine the number of ozone molecules are lost in the atmosphere.
The mole concept was introduced by Avogadro. The mole is the SI unit of amount of substance. According to Avogadro, one mole of a substance contains 6.02 × 10^23 atoms, ions, molecules etc.
The mole concept is important in many chemical calculations. The mole concept can be used to determine the number of ozone molecules are lost in the atmosphere. (option C)
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Examples of gravitational potential energy.
Answer:
the top of the roller coaster
Explanation:
the roller coaster at the top when it has the most potential energy reaches Peak when its going to convert into kinetic energy
one home is heated by burning wood in a fireplace, while another similar home is heated by burning oil. which method uses less fuel? why?
Answer:
Well?
Explanation:
Both would use the same.
Also I would use wood rarther than oil but your answer is:
Oil uses less fuel because wood burns at a more faster speed.
The volume of an air bubble at the bottom of a lake is 1.35 mL. If the pressure at the bottom of the lake is 125 kPa and the air pressure at the top of the lake is 105 kPa, what will the volume of the bubble be when it rises to the surface?
Answer:
1.61 mL
Explanation:
Step 1:
Data obtained from the question. This includes the following:
Initial volume (V1) = 1.35 mL
Initial pressure (P1) = 125 kPa
Final pressure (P2) = 105 kPa
Final volume (V2) =..?
Step 2:
Determination of the volume of the air bubble at the surface of the lake.
This can be obtained by use the Boyle's law equation as follow:
P1V1 = P2V2
125 x 1.35 = 105 x V2
Divide both side by 105
V2 = (125 x 1.35)/105
V2 = 1.61 mL
Therefore, the volume of the air bubble at the surface of the lake is 1.61 mL
Which of the following is a chemical property of liquid water?
Its density is 1.00 g/cm3.
It reacts with sodium metal to form sodium hydroxide and hydrogen gas
It flows.
It freezes to form ice.
It boils at 100°C.
Answer:
B) it reacts with sodium metal to form sodium hydroxide and hydrogen gas
Explanation:
B is the only option that show a chemical property, density, freezing, and boiling points are physical properties.
How does activation energy affect the progress of a reaction?
O A. The reaction will not occur unless the activation energy is met.
B. The activation energy decreases the energy needed for a reaction
to progress.
C. The activation energy increases how quickly the reaction will
progress.
D. The activation energy determines equilibrium concentrations of
products.
Answer:
The reaction will not occur unless the activation energy is met.
Explanation
Answer:
A. The reaction will not occur unless the activation energy is met.
Explanation:
a.p.e.x
can somebody help me name these organic compound plz
Answer:
A. 3–Ethyl–2–methylpentane.
B. 3–Ethyl–1,5,5–trimethylcyclohexene.
Explanation:
To name the compound, we must observe the following:
1. Locate the longest continuous carbon chain. This gives the parent name.
2. Identify the substituent groups attached.
3. Locate the position of the substituent groups by giving them the lowest possible low count alphabetically.
4. Combine the above to name the compound.
Now let us name the above compounds
For compound (A)
1.The longest chain is carbon 5 i.e pentane.
2. The substitute attached are:
Ethyl => CH2CH3
Methyl => CH3
3. Ethyl comes before methyl alphabetically. But considering the structure of the compound, ethyl assume same position from either side of the compound. Therefore, we'll consider the lowest possible count for methyl. Therefore, their position is given below:
Ethyl => CH2CH3 => carbon 3.
Methyl => CH3 => carbon 2.
4. The name of the compound is:
3–Ethyl–2–methylpentane.
Compound B.
This is a cyclic structure.
1. The parent name is cyclohexene.
2. The substitute groups attached are:
Ethyl => CH2CH3
Methyl => CH3
3. Since the compound is unsaturated, the functional group is the double bond. Hence, we shall start our counting from the double bond and also considering alphabetical order of the substituent.
Please note methyl (CH3) appears three times.
Ethyl => CH2CH3 => carbon 3
Methyl => CH3 => carbon 1, 5 and 5.
4. The name of the compound is:
3–Ethyl–1,5,5–trimethylcyclohexene
how many atoms are in 50 grams of calcium
The number of atoms in an elemental atom can be estimated by Avogadro's number or the number of equivalents. In 50 grams of calcium, there are 7.53 × 10²³ atoms.
What is Avogadro's number?Avogadro's numbers are used to estimate the number of smaller entities like the number of atoms and molecules in a compound for a substance. It determines the atom in a given mass of the atom. Avogadro's number (Nₐ) is equal to 6.022 × 10²³.
Given,
Mass of calcium = 50 gm
The molar mass of calcium = 40 gm/mol
The moles are calculated from mass and molar mass as:
Moles = mass ÷ molar mass
n = 50 ÷ 40
= 1.25 mol
It is known that a mole of a substance contains Nₐ atoms.
1 mol = 6.022 × 10²³ atoms
Then, 1.25 mol = 1.25 × 6.022 × 10²³
= 7.53 × 10²³
Therefore, there are 7.53 × 10²³ atoms in 50 grams of calcium.
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A fox spots a rabbit in a field. The fox begins to chase the rabbit, and the rabbit runs away. Which statement best describes the rabbit's behavior in response to the stimulus of being chased?
Select one:
The rabbit's behavior is a response caused by an internal stimulus.
The rabbit's behavior is a tropism.
The rabbit's behavior is a fight-or-flight response.
The rabbit's behavior is a response caused by hunger.
Answer:
C. The rabbit's behavior is a fight-or-flight response
Explanation:
The rabbit has a fight or flight response which means that when there is danger, the rabbit will either fight it or run away. In this case it ran away
The response of the rabbit in response to the fox chasing has been the fight and flight response. Thus, option C is correct.
What is a stimulus?A stimulus can be given as the physical or the chemical messenger that mediates the formation of the functional change in the body. The reaction to the stimulus has been the spontaneous reaction that can form the sudden response forming reaction.
The fox chasing the rabbit has been mediating the formation of the stimulus. The chasing act as the stimulus to the rabbit forming the rabbit to create the response or reaction of running. The reaction that forms with the stimulus of fear and frightening has been the fight and flight response.
The stimulus that has been formed arouses the fear of getting caught and works as the fight and flight response. Thus, option C is correct.
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With your bare feet, stand with one foot on a rug, and the other foot on a tile, linoleum, or wood floor. Which one feels colder? Which one is really colder?
Answer:
I would say the wood floor because it's really cold. I hope this helps you out ☺️
Explanation:
Answer: i would say tile floor just because it gets cold around and is not able to be heated like carpet lol
Explanation:
Which of the following is the energy that comes from changes in an atom’s nucleus?
a. thermal energy
b. nuclear energy
c. light energy
d. electrical
In the following reaction, will the [H2] increase or decrease when equilibrium is reestablished after these stresses are applied?
N2 (g) + 3 H2 (g) ←--> 2 NH3 (g) + 22 kJ
NH3(g) is added ________
N2(g) is removed ________
2. Note reaction: 2 NO (g) + H2 (g)<---->N2 O (g) + H2 O (g) + 36 kJ
In which direction, left or right, will the equilibrium shift if the following changes are made?
NO is added ________
H2 is removed ________
N2O is added ________
H2 is removed ________
3. In this reaction: CO2 (g) + H2 (g) + heat ←-->CO (g) + H2 O (g)
In which direction will the equilibrium shift if these changes are made?
CO is added ________
CO2 is added ________
H2 is removed ________
4. In this reaction: 2 NO (g) + H2 (g) ←--->N2 O (g) + H2 O (g) + heat
What will happen to the [H2O] when equilibrium is reestablished after these stresses are applied?
NO is added ________
N2O is removed _________
Answer:
1. (i) H₂ will decrease
(ii) H₂ will increase
2. (i) Shift right
(ii) Shift left
(iii) Shift left
(iv) Shift left
3. (i) Shift left
(ii) Shift right
(iii) Shift left
4. (i) H₂O will increase
(ii) H₂O will increase
Explanation:
1. For the reaction, N₂ (g) + 3H₂ (g) ↔ 2NH₃ (g) + 22 kJ
(i) When the NH₃ is removed, the concentration of the products is reduced favoring the consumption of further reactants hence the H₂ will decrease
(ii) When N₂ is removed, N₂ will become the limiting reactant resulting in the presence of excess H₂, hence H₂ will increase
2. 2NO (g) + H₂ (g) ↔ N₂O (g) + H₂O (g) 36 kJ
(i) When NO is added, it will favor the increase of the reaction and the equilibrium will shift to the right
(ii) H₂ is removed, it will favor the decomposition of the products hence the equilibrium will shift to the left
(iii) When N₂O is added, it will cause the increase in the partial pressure of the products which will result in the increase in the partial pressures of the reactants to compensate, hence the equilibrium will shift to the left
(iv) When H₂ is removed it will cause the equilibrium to shift left as more products will decompose to form the balance H₂
3. For the reaction;
CO₂ (g) + H₂ (g) + heat ↔ CO (g) + H₂O (g)
(i) When CO is added, there will be an excess partial pressure of the products and the equilibrium will shift left
(ii) When CO₂ is added, there will be an excess partial pressure of the reactants which will favor the formation of the products and the equilibrium will shift right
(iii) When H₂ is removed, there will be an decrease in the partial pressure and concentration of the reactants which will favor the decomposition of the products to balance up the partial pressures of the reactant and the equilibrium will shift left
4. In the reaction 2NO (g) + H₂ (g) ↔ N₂O (g) + H₂O (g) + heat
(i) When NO is added, the concentration of the reactants will increase, hence increasing the likelihood of the formation of more products and the equilibrium will shift to the right and H₂O will increase
(ii) When N₂O is removed, the partial pressure and concentration of the products will reduce hence to balance up the partial pressures of the reacting mixture, more products will be formed and H₂O will increase.
How does the pressure of a container change as the volume is changed?
Answer: If the volume is decreased, the pressure would increase because the gas molecules have less space to move around. Same goes for the opposite; if the volume increased, the pressure would decrease because the molecules have more space to move and aren't packed as tightly .
Hope this helps!!!
