Quiz about Review of Physical and Chemical Changes

Question 1

In a science class, students are investigating physical changes in matter. The teacher provides them with various dry and liquids materials. Which of the three investigations would be the most appropriate to observe a physical change?

Accepted Answer

Use pretzels, chocolate candy, and nuts to make a trail mix

Accepted Answer

Add sugar to a tea mix to make it sweet.

Accepted Answer

Separate sand and water using a filter.

Answer

Mix cooking oil with four, water, and salt and heat it in the stove.

Answer

Mix baking soda and vinegar to observe the bubbles that form.

Question 2

On way to school one morning, students saw snow on the ground. On the way home, students noticed that there was less snow and a puddle of water.

Which argument best supports the claim that the snow changed to water due to the increasing temperature during the day?

Accepted Answer

Some of the snow changed to water because the temperature rose steadily from below freezing to above freezing throughout the day.

Answer

Some of the snow changed to water because the surrounding environment became more humid as the day progressed.

Answer

Some of the snow changed to water because it was exposed to sunlight for an extended period of time.

Answer

Some of the snow changed to water because the temperature dropped steadily from above freezing to below freezing throughout the day.

Question 3

Students in a science class are investigating to determine if a chemical change occurs. The students mix baking soda with water in one container, baking soda with vinegar in another container, and leave a third container with just water. They carefully observe the reactions in each container. Here are the observations recorded by the group.

Based on the investigation, which bottle had a chemical change?

Accepted Answer

Container 2 is a chemical change because there is a temperature change.

Answer

Container 3 is a chemical change because there was no temperature change.

Answer

Container 1 is a chemical change because there is no temperature change.

Answer

None of the containers demonstrated a chemical change.

Question 4

What is a common observable evidence of a chemical change?

Accepted Answer

Production of a new substance.

Answer

Change in shape

Answer

Change in size

Answer

Change in texture

Question 5

Which of the following is an example of a chemical change?

Accepted Answer

Baking a cake

Answer

Ice melting

Answer

Sugar dissolving in water

Answer

Freezing water

Question 6

If a new substance if produced during an investigation, it is most likely due to...

Accepted Answer

Chemical change

Answer

Physical change

Answer

No change occurred

Answer

Evaporation

Question 7

If a strong odor is detected during an investigation, it may suggest:

Accepted Answer

Chemical change

Answer

No change occured

Answer

Physical change

Answer

<p>Erosion</p>

Question 8

If no observable evidence of a chemical change is detected, it may mean:

Accepted Answer

Only physical change occurred

Answer

Only chemical change occurred

Answer

No changes occurred

Answer

Evidence was missed

Question 9

What is an example of a physical change?

Accepted Answer

Melting ice

Answer

Burning wood

Answer

Rusting iron

Answer

Baking a cake

Question 10

Which of the following is a physical change that involves a change in state?

Accepted Answer

Boiling an egg

Answer

Digesting food

Answer

Mixing salt and water

Answer

Photosynthesis

Question 11

What happens to water particles when they are cooled?

Accepted Answer

They slow down and move closer together

Answer

They vibrate more

Answer

They speed up and move further apart

Answer

They disappear

Question 12

What happens to water particles when they are heated?

Accepted Answer

They speed up and spread out

Answer

They slow down and get closer togehter

Answer

They shrink

Answer

They disappear

Question 13

A candle is burning in a room. Jacob thinks a chemical change is taking place, but Maria thinks is a physical change. Who is correct and why?

Accepted Answer

Both because burning the candle wick is chemical and the wax is going from solid to liquid indication a physical change.

Answer

Jacob because there is heat being given off by the candle

Answer

Maria because there is presence of a solid and a liquid.

Answer

Neither person is correct because the candle is getting shorter.

Question 14

A YouTube channel's content is focused on restoring old pieces of metal. He usually find them rusty and is able to scrap off the rust. Rust is a result of what type of change and what might have caused it to form?

Accepted Answer

Chemical change because the metal combined with water and formed a new substance.

Answer

Physical change because it can go back to its original state.

Answer

Physical change because the iron mixed with pollution to form rust.

Answer

Chemical change because over time the metal became worn.

Question 15

A Student mixes table salt into water. He says that the result is an example of a chemical change. Student B disagrees. She says the result is an example of a physical change. Which student is right and why?

Accepted Answer

Student B is right because the water can be evaporated and the salt can be recovered.

Answer

Student A is correct because salt water has different properties than fresh water.

Answer

Student B is right because a new substance has been formed that cannot be changed.

Answer

Student A is right because the mixture now tastes salty even though it looks the same.

Question 16

The diagram shows three different ways that pieces of paper were changed. Which statement best describes what happened to the papers during each change?

Accepted Answer

The papers went though physical changes because the shape changed.

Answer

The papers went through chemical changes because the shape changed.

Answer

The papers went though physical changes because a new substance was produced.

Answer

The papers went through chemical changes because a new substance was produced.

Question 17

A student fills a tray with water and places the tray in the freezer. Three hours later, the student removes the tray from the freezer and makes observations.

The student claims that changing the temperature of water causes a physical change that turns water into ice.

Which of the following best supports the student's claim about a physical change.

Accepted Answer

Ice forms because heat is removed, causing the particles that make up ice to move slower. This changes the water from a liquid to a solid.

Answer

Ice forms because heat is added, causing the particles that make up the ice to move faster. This makes the ice change shape.

Answer

Ice forms because heat is slower, causing the particles that make up the ice to move faster. This changes the water from a liquid to a solid.

Answer

Ice forms because heat is removed, causing the particles that make up ice to move slower. This changes the water from a liquid to a solid.

Question 18

A student is investigating chemical changes by using different materials. Which investigation would provide evidence of a chemical change and why?

Accepted Answer

Combining two liquids that give off heat and gas would provide evidence of a chemical change because the particles react to make a new material with different properties.

Answer

Melting a solid with fire would provide evidence of a chemical change because the solid changes shape.

Answer

Cutting cardboard into many smaller pieces would provide evidence of a chemical change because the pieces cannot be put back together.

Answer

Placing a solid into hot water and stirring whole the solid dissolves would provide evidence of a chemical change because the dissolved material is lost.

Question 19

Which investigation would provide evidence of a chemical change?

Accepted Answer

Put an antacid tablet in water, and when the antacid and water mix, observe the bubbles that form as a new substance is created.

Answer

Spray perfume into air, and when air and perfume mix, observe the change in odor that happens as they mix

Answer

Heat water in a pan on a stove, and observe the steam that forms as the state of matter of the water changes.

Answer

Blow air through a wand filled with soap solution, and observe the bubbles that form as the air becomes trapped.

Question 20

Students are investigating chemical changes that occur in different materials. Which two investigations would provide evidence of a chemical change?

Accepted Answer

Using a hot plate to heat solid until is changes color and releases an odor would provide evidence of a chemical change because the particles cannot be changed back.

Accepted Answer

Placing two different liquids together in a beaker and observing that a solid forms when they mix would provide evidence of a chemical changes because a new material is formed.

Answer

Placing a liquid in a freezer until the liquid becomes a solid would provide evidence of a chemical change because the state of matter changed.

Answer

Using a saw to cut a solid into two different pieces would provide evidence of a chemical change because the pieces cannot be put back together.

Answer

Placing a mixture containing a solid and a liquid on a windowsill and letting the liquid evaporate would provide evidence of a chemical change because the evaporated material is lost.

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