CHEMISTRY MIDDLE SCHOOL

If volume is increased, the number of collisions per second... decreases or increases?

Answers

Answer 1
Answer:

Answer:

if volume is increased, the number of collisions per second decreases.

Explanation:

volume is inversely proportional to pressure. Increase in volume leads to decrease in pressure and decrease in volume leads to increase in pressure.

if the pressure is high, it leads to increase in the number of collisions. If the pressure is low, it leads to decrease int he number of collisions.

therefore since volume is inversely proportional, when volume is increased, the pressure decreases and thus the number of collisions decreases.

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What was helium used for in the past?

Answers

Helium used to be used in hot air balloons.  Then, when the Hindenburg exploded, annexed file, they realized that hydrogen was not only lighter, but it also was less flammable.  

Hot air balloons. They have a little hot plate/fire or whatever and they used, and that made the helium rise, thus rising the balloon.

Which is true according to the law of conservation of energy?

Answers

Answer:

The answer is C

Explanation:
There are no options but law of conservation of energy states that energy can’t be created or destroyed.

Which quantity can be calculated for a solid compound, given only the formula of the compound and the Periodic Table of the Elements?(1) the density of the compound

(2) the heat of fusion of the compound

(3) the melting point of each element in the compound

(4) the percent composition by mass of each element in the compound

Answers

The answer is the percent composition which is number 4. This is the percent by mass of each element existing in a compound. To compute for this, you need to find two things: the mass of just the element, and the molar mass of the entire compound. Afterwards, you take the molar mass of only the element and divide it by the molar mass of the entire compound, and multiply by 100%.

Select the correct answer.What is a transferable skill?
A.
a summary of experiences
OB. the ability to do something
o o o
C.
the movement of skills from one experience to another
OD.
a skill you learn from another person
Reset
Net

Answers

The answer is C the movement of skills from one experience to another

Answer:

C

Explanation:

Transferable skills are an important component of the skills you need for a job. These are the skills you obtain from one experience and later use in another. You can gain these skills from various life experiences, work experiences, or projects that you have worked on. You gain transferable skills at school, at work, while doing voluntary work, or from a hobby or sports. These skills include punctuality, teamwork, and leadership. These learned skills can help you at all stages of your life.

Water (2190 g ) is heated until it just begins to boil. If the water absorbs 5.75×105 J of heat in the process, what was the initial temperature of the water?

Answers

Answer:

37.18°C.

Explanation:

  • The amount of heat absorbed by water = Q = m.c.ΔT.

where, Q is amount of heat absorbed by water (Q = 5.75 x 10⁵ J).

m is the mass of water (m = 2190 g).

c is the specific heat capacity of liquid water = 4.18 J/g°C.

ΔT is the temperature difference = (final T - initial T = 100.0°C - initial T).

∴ Q = m.c.ΔT = 5.75 x 10⁵ J.

5.75 x 10⁵ J = (2190 g)(4.18 J/g°C)(100.0°C - initial T)

∴ (100.0°C - initial T) = (5.75 x 10⁵ J)/(2190 g)(4.18 J/g°C) = 62.81°C.

∴ initial T = (100.0°C - 62.81°C) = 37.18°C.

Please show information to support your answerWhich of the following is a sign of a chemical reaction?


A. A liquid changes to a solid.


B. A solid changes to a gas.


C. A gas is released from a liquid.


D. A liquid changes to a gas.

Answers

Option C:

A gas is released from a liquid

Hope this will help :)
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