CHEMISTRY HIGH SCHOOL

A student blows up a ballon and then places it in a very cold freezer the ballon shrunk after hours why!?

Answers

Answer 1
Answer: Temperature is directly related to the speed of the molecules such that as the temperature decreases, so does the speed of the molecules. When the balloon was placed in the freezer, the temperature plummeted and so the molecules moved less. Due to this lack of movement, less space was used by the balloon so it shrunk.

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How many moles of CaO form when 98.60 g CaCO3 decompose

Answers

The balanced reaction is:

CaCO3 = CaO + CO2

We are given the amount of CaCO3 to decompose when heated. This will be our starting point.

 

98.60 g CaCO3 ( 1 mol CaCO3 / 100.09 grams CaCO3) (1 mol CaO / 1 mol CaCO3 ) ( 56.08 g O2 / 1 mol CaO) =  55.25 g CaO

0.9851mol.                      This is the rt answer just did it

The change in heat energy for a reaction is best expressed as a change in a. Enthalpy (H)
b. Absolute temperature (T)
c. Specific heat (c)
d. Entropy (S)
e. Kinetic energy (KE)

Answers

If the reaction is at constant pressure then it is a. Enthalpy

There are no negative consequences to using nuclear energy.

true or false

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false..........
it has so many consequences

False hope this helps

Why are milk powder tins and salmon tins coated with tin (Sn) metal? Give reasons based on the reactivity series of the metals.Urgent!!
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the tin in reactivity arrangement implies more receptive than tin and can respond with food components protected in it

The ____ contains the highest concentration of ozone.a. troposphere
c. stratosphere
b. mesosphere
d. exosphere

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C. The stratosphere. About 90% of the ozone is in the stratosphere which begins about 8 miles above the Earth's surface.

Answer: Option (c) is the correct answer.

Explanation:

A layer above the troposphere and below the mesosphere is known as stratosphere.

This layer of stratosphere contains about 90% concentration of ozone and there is no occurrence of weather in this layer.

The occurrence of ozone in stratosphere makes it warmer.

Therefore, we can conclude that the stratosphere contains the highest concentration of ozone.

Which of the following is a quemical property ?

Answers

One chemical property would be reactivity of a particular substance.
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Consider the following generic chemical equation:A + B → C + D Reactant A contains 85.1 J of chemical energy. Reactant B contains 87.9 J of chemical energy. Product C contains 38.7 J of chemical energy. If the reaction absorbs 104.3 J of chemical energy as it proceeds, how much chemical energy must product D contain? Explain your answer.
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?1) 1 mol of oxygen has fewer molecules.2) 1 mol of oxygen has more molecules.3) Each sample has the same number of molecules.4) The molecules cannot be compared without knowing the mass.