CHEMISTRY MIDDLE SCHOOL

1. What two quantities must be known to calculate the density of a sample of matter?A. color and mass
B. mass and volume
C. length and mass
D. solubility and mass

Answers

Answer 1
Answer: remember the formula for density:
d = (m)/(v)
where d is density, m is mass, and v is volume.

Therefore, B. mass and volume is needed to determine the density
Answer 2
Answer: mass andvolume is the answer

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There are seven major levels of classification. Kingdom and Phylum are just two of the levels. Which of the following are also major levels of classification?Choose all answers that are correct.

A.Class

B.Order

C.Family

D.Level

Answers

A) The class and C) Family would be the only accurate option. Here are the levels from largest to smallest: kingdom, phylum, class, order, family, genus and species.

1.The ___________ energy in a mechanical system is determined by adding the potential and kinetic energy together.


total
massive
2.
The initial ___________ energy is equal to zero because the starting point is set at zero height to make things easier.


kinetic
potential
3.
In the example, the final kinetic energy is determined to be ___________ because at the peak height, the ball instantaneously stops.


positive
zero
negative
4.
In this system, potential and kinetic energy are ________________ proportional.


inversely
directly

Answers

The system has an energy that can be conserved in the system, and when work is performed, the energy has been converted to working energy.

The following sentences can be completed as:

  • The total energy in a mechanical system is determined by adding the potential and kinetic energy together.

Total energy = Potential energy + Kinetic energy

  • The initial Kinetic energy is equal to zero because the starting point is set at zero height to make things easier.

  • In the example, the final kinetic energy is determined to be zero because, at the peak height, the ball instantaneously stops.

  • In this system, potential and kinetic energy are inversely proportional.

For more information about kinetic and potential energy, refer to the link:

brainly.com/question/22228414

Answer:

1)total, 2)potential, 3)zero, 4)inversely.

Explanation:

1) The total energy in a mechanical system is determined by adding the potential and kinetic energy together.

2) The initial potential energy is equal to zero because the starting point is set at zero height to make things easier.

3) In the example, the final kinetic energy is determined to be zero because at the peak height, the ball instantaneously stops.

4) In this system, potential and kinetic energy are inversely proportional.

Which of these is indication that a chemical reaction has occurred?A. Freezing of a substance

B. Melting of a substance

C. Boiling of a substance

D. Formation of a Preciptate

Answers

B.melting of a substance
I think it's B, the melting of a substance.

(Fill in the blank) A kilometer is __________ times bigger than a meter.

Answers

Answer:

1000

Explanation:

kilometer equals to 1000 meters

1 kilometer would be 1000 or 10^3 meters

If a gas occupies 22.4 L at 0.265 atm, then what will the pressure be in atmospheres if the gas occupies 35.52 L? Assume all othervariables are held constant
A)0.167 atm
B)0.437 atm
C)0.886 atm
D)149 atm

Answers

Answer:

The new pressure is 0.167 atm

The correct answer is option A

Explanation:

Step 1: Data given

Volume of the gas = 22.4 L

Pressure of the gas = 0.265 atm

The volume increases to 35.52 L

Step 2: Calculate the new pressure

P1*V1 = P2*V2

⇒with P1 = the initial pressure = 0.265 atm

⇒with V1 = the initial volume = 22.4 L

⇒with P2 = the new pressure = TO BE DETERMINED

⇒with V2 = the increased volume = 35.52 L

0.265 atm * 22.4 L = P2 * 35.52 L

P2 = (0.265 atm * 22.4 L) / 35.52 L

P2 = 0.167 atm

The new pressure is 0.167 atm

The correct answer is option A

Why do atoms move at different speeds depending on whether they are in liquids or solids.

Answers

In a solid the atoms are tightly packed together and vibrate in place, in a liquid the atoms are loosely packed together and can move past each other,
 
extra: and in a gas the atoms are far apart and move freely and 
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