Which phase change occurs when particles are slowing down and moving closer together?(1 point)

Question

Responses

Evaporation
Evaporation

Boiling
Boiling

Melting
Melting

Condensation

The table below shows the densities of three contrasting liquids.
liquid density
a 13.6 g/mL
b 0.8 g/mL
c 1.0 g/mL
Based on density, which picture shows how these liquids would arrange when placed in a container together?

(1 point)
Responses

Which of the following is a physical property of potassium?(1 point)
Responses

Reactivity with acid
Reactivity with acid

Freezing point
Freezing point

Flammability
Flammability

Combustibility

Question
A liquid has a mass of 25 grams (g) and a volume of 10 milliliters (mL). Calculate the density of the liquid.(1 point)
Responses

0.4 g/mL
0.4 g/mL

2.5 g/mL
2.5 g/mL

4.0 g/mL
4.0 g/mL

250 g/mL
250 g/mL
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A student observes a raw egg float in concentrated salt water but sink in tap water. What can the student conclude from this observation?(1 point)
Responses

A raw egg has equal density as salt water.
A raw egg has equal density as salt water.

A raw egg is less dense than salt water but more dense than tap water.
A raw egg is less dense than salt water but more dense than tap water.

A raw egg is less dense than tap water but more dense than salt water.
A raw egg is less dense than tap water but more dense than salt water.

A raw egg, salt water, and tap water have equal densities.

Answer 1

1. The phase change that occurs when particles are slowing down and moving closer together is Condensation.

2. In the container, the liquids would arrange themselves according to their densities. The liquid with density 13.6 g/mL (liquid a) would be at the bottom, followed by the liquid with density 1.0 g/mL (liquid c), and then the liquid with density 0.8 g/mL (liquid b) at the top. You would likely need an image to pick the corresponding arrangement.

3. A physical property of potassium is its Freezing point.

4. To calculate the density of the liquid, you can use the formula: Density = Mass / Volume. So, Density = 25 g / 10 mL = 2.5 g/mL.

5. The conclusion the student can draw from observing a raw egg floating in concentrated salt water but sinking in tap water is that A raw egg is less dense than salt water but more dense than tap water.