In a __ change, the chemical bonds between atoms are broken rearranged to form new substances. (chemical or physical)

Question

A __ change is a change in the appearance or state of a substance without any change in its chemical composition. (chemical or physical)

When iron rusts, it undergoes a __ change because new substances are formed. (chemical or physical)

When ice melts, it undergoes a __ change because new substances are formed. (chemical or physical)

The boiling of water is an example of a __ change because the state of the water changes form liquid to gas. (chemical or physical)

Cooking an egg is an example of a __ change. (chemical or physical)

Answer 1

In a chemical change, the chemical bonds between atoms are broken and rearranged to form new substances.

A physical change is a change in the appearance or state of a substance without any change in its chemical composition.

When iron rusts, it undergoes a chemical change because new substances are formed.

When ice melts, it undergoes a physical change because new substances are not formed; it is simply a change of state from solid to liquid.

The boiling of water is an example of a physical change because the state of the water changes from liquid to gas, without any change in its chemical composition.

Cooking an egg is an example of a chemical change.

Answer 2

There is a sour smelling liquid present in a cup of milk that was left on the counter for 3 days. (chemical or physical)

a balloon is such smaller after letting the air out. (chemical or physical)

There is a loud sound after a firework explodes in the air. (chemical or physical)

There is a liquid substance in a pot after putting a chunk of butter. (chemical or physical)

There is a brown banana on the counter that was originally yellow.
(chemical or physical)

Answer 3

1. There is a sour smelling liquid present in a cup of milk that was left on the counter for 3 days. (This is a chemical change because the milk has spoiled and new substances, such as lactic acid, have formed.)

2. A balloon is much smaller after letting the air out. (This is a physical change because the size and shape of the balloon have changed, but the chemical composition of the air inside remains the same.)

3. There is a loud sound after a firework explodes in the air. (This is a chemical change because the explosion involves a chemical reaction, resulting in the formation of new substances along with sound energy.)

4. There is a liquid substance in a pot after putting a chunk of butter. (This is a physical change because the butter melts, changing from solid to liquid, but its chemical composition remains the same.)

5. There is a brown banana on the counter that was originally yellow. (This is a chemical change because the banana undergoes ripening and some decomposition, resulting in a change in color and the formation of new substances.)

Answer 4

Is a copper penny reacting to nitric acid a chemical or physical write 2 sentences explaining why in a simple form.

Is freezing a glass of water a physical or chemical change write 2 sentences explaining why in a simple form.

Answer 5

A copper penny reacting to nitric acid is a chemical change. This is because the nitric acid reacts with the copper, breaking chemical bonds and forming new substances, such as copper nitrate and nitrogen dioxide. The original material, copper, is transformed into entirely different compounds during this reaction.

Freezing a glass of water is a physical change. This is because the water changes from a liquid state to a solid state (ice) without altering its chemical composition. When the water freezes, its molecular structure is rearranged, but it remains H₂O in both states.

Answer 6

Is an apple sitting out for days a physical or chemical change, write two sentences explaining why in a simple form

Answer 7

An apple sitting out for days undergoes a chemical change. This occurs because the apple begins to rot and decompose, leading to the formation of new substances as it breaks down. Changes like browning and the development of off odors indicate that the chemical composition of the apple is changing over time.

Answer 8

Is making an origami owl a chemical or physical change write two sentences explaining why in a simple form.

Answer 9

Making an origami owl is a physical change. This is because the paper is simply being folded and shaped into a new form without altering its chemical composition. The paper remains paper throughout the process; it retains its properties and can be unfolded back to its original state.

Answer 10

Silver nitrate with HCI why was this a chemical change, explain in two sentences why it is in a simple form

Answer 11

The reaction between silver nitrate (AgNO₃) and hydrochloric acid (HCl) is a chemical change because it produces new substances, specifically silver chloride (AgCl) and nitric acid (HNO₃). This change is evident when a white precipitate forms, indicating that the original compounds have reacted and transformed into different substances, which are not easily reversed.