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# what is an example of a physical change? having less ash than the paper that was burned to form it ice forming and then melting back into water rust having a different identity than the iron it forms on the irreversible reaction of vinegar and baking soda

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## Physical Properties Flashcards

Study with Quizlet and memorize flashcards terms like If there is 8 g of a substance before a physical change, how much will there be afterward? A )0 g B) 4 g C) 8 g D) 16 g, What is an example of a physical change? A) Having less ash than the paper that was burned to form it B) Ice forming and then melting back into water C) Rust having a different identity than the iron it forms on D) The irreversible reaction of vinegar and baking soda, Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change? A) It will weigh more than 15 grams. B) It will have an increased density. C) It will still weigh 15 grams. D) It will still have the same density. and more.

## Physical Properties

5.0 6 Reviews

If there is 8 g of a substance before a physical change, how much will there be afterward?

A )0 g B) 4 g C) 8 g D) 16 g

Click card to see definition 👆

C) 8 grams

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What is an example of a physical change?

A) Having less ash than the paper that was burned to form it

B) Ice forming and then melting back into water

C) Rust having a different identity than the iron it forms on

D) The irreversible reaction of vinegar and baking soda

Click card to see definition 👆

B) Ice forming and then melting back into water

Click again to see term 👆

1/10 Created by vanessar2931

### Terms in this set (10)

If there is 8 g of a substance before a physical change, how much will there be afterward?

A )0 g B) 4 g C) 8 g D) 16 g C) 8 grams

What is an example of a physical change?

A) Having less ash than the paper that was burned to form it

B) Ice forming and then melting back into water

C) Rust having a different identity than the iron it forms on

D) The irreversible reaction of vinegar and baking soda

B) Ice forming and then melting back into water

Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?

A) It will weigh more than 15 grams.

B) It will have an increased density.

C) It will still weigh 15 grams.

D) It will still have the same density.

C) It will still weight 15 grams

Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?

A) Solubility B) Conductivity C) Magnetism D) Density A) Solubility

When water (H2O) freezes into ice, some of the properties have changed. What stays the same?

A) Identity of the H2O

B) Energy of the H2O

C) Arrangement of the H2O

D) Property of the H2O

A) Identity of the H2O

Eugene describes the physical property of a material as "sweet and floral." What physical property of the material is Eugene most likely observing?

A) Boiling point B) Shape C) Hardness D) Odor D) Odor

Which statement about the physical change of liquid water boiling into steam is true?

A) The heat added represents an energy change.

B) The action cannot be reversed.

C) The steam cannot conserve mass.

D) The weight lost represents a mass change.

A) The heat added represents an energy change

Which can occur in a physical change?

A) The mass can increase.

B) The particles can arrange in different ways.

C) The mass can decrease.

D) The atoms can bond to different atoms.

B) Particles can arrange in different ways

Which scenario is an example of a physical change?

A) Wood is burned in a campfire and is turned into ash and smoke.

B) A piece of metal is left in the rain and forms rust.

C) Lead is melted into a liquid to form pellets.

D) Yeast turns sugar into energy, water, and carbon dioxide gas.

A) Wood is burned in a campfire and is turned into ash and smoke.

C) Lead is melted into a liquid to form pellets.

D) Yeast turns sugar into energy, water, and carbon dioxide gas.

The Statue of Liberty is made of copper that has turned green because it has undergone a change. What can be said about this change?

A) The change is a physical change because the copper in the statue is still there.

B) The change is a physical change because a new chemical is formed on the outside of the statue.

C) The change is not a physical change because the color of the statue has changed.

D) The change is not a physical change because a new chemical is formed on the outside of the statue.

D) The change is not a physical change because a new chemical is formed on the outside of the statue.

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Source : quizlet.com

## 10.4: Physical and Chemical Changes

A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.  In contrast, a chemical property describes the …

## 10.4: Physical and Chemical Changes

Last updated Aug 13, 2020 10.3: Half-Life

10.5: Chemical Equations

Allison Soult

University of Kentucky

Learning Outcomes

Distinguish between physical and chemical changes.

Give examples of physical and chemical changes.

## Physical Changes

As an ice cube melts, its shape changes as it acquires the ability to flow. However, its composition does not change. Melting is an example of a physical change. A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Physical changes can further be classified as reversible or irreversible. The melted ice cube may be refrozen, so melting is a reversible physical change. Physical changes that involve a change of state are all reversible. Other changes of state include vaporization (liquid to gas), freezing (liquid to solid), and condensation (gas to liquid). Dissolving is also a reversible physical change. When salt is dissolved into water, the salt is said to have entered the aqueous state. The salt may be regained by boiling off the water, leaving the salt behind.

Figure 10.4.1 10.4.1

: Melting ice in the Beaufort Sea.

When a piece of wood is ground into sawdust, that change is irreversible since the sawdust could not be reconstituted into the same piece of wood that it was before. Cutting the grass or pulverizing a rock would be other irreversible physical changes. Firewood also represents an irreversible physical change since the pieces cannot be put back together to form the tree.

Figure 10.4.2 10.4.2

: Firewood being cut is a physical change because the composition doesn't change when being cut.

## Chemical Changes

When exposed to air, an object made of iron will eventually begin to rust (see figure below).

Figure 10.4.3 10.4.3

: Rust (iron oxide) forms on an unprotected iron surface.

As the rust forms on the surface of the iron, it flakes off to expose more iron, which will continue to rust. Rust is clearly a substance that is different from iron. Rusting is an example of a chemical change.

A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical property of iron is that it is capable of combining with oxygen to form iron oxide, the chemical name of rust. A more general term for rusting and other similar processes is corrosion. Other terms that are commonly used in descriptions of chemical changes are burn, rot, explode, and ferment. Chemical properties are very useful as a way of identifying substances. However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance.

A chemical change is also called a chemical reaction. A chemical reaction is a process that occurs when one or more substances are changed into one or more new substances. Zinc

(Zn) (Zn)

is a silver-gray element that can be ground into a powder. If zinc is mixed at room temperature with powdered sulfur

(S) (S)

, a bright yellow element, the result will simply be a mixture of zinc and sulfur. No chemical reaction occurs. However, if energy is provided to the mixture in the form of heat, the zinc will chemically react with the sulfur to form the compound zinc sulfide

(ZnS) (ZnS)

. Pictured below are the substances involved in this reaction.

Figure 10.4.4 10.4.4

: Zinc (A) and sulfur (B) are two elements that undergo a chemical reaction when heated to form the the compound zinc sulfide (C).

The reaction between zinc and sulfur can be depicted in something called a chemical equation. In words, we could write the reaction as:

zinc+sulfur→zinc sulfide

(10.4.1)

(10.4.1)zinc+sulfur→zinc sulfide

A more convenient way to express a chemical reaction is to use the symbols and formulas of the substances involved:

Zn+S→ZnS (10.4.2) (10.4.2)Zn+S→ZnS

The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products. A product is a substance that is present at the end of a chemical reaction. In the equation above, zinc and sulfur are the reactants that chemically combine to form zinc sulfide as a product.

Source : chem.libretexts.org

## Unit Review: Physical and Chemical Properties of Matter

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Science

## 7th

7th Unit Review: Physical and Chemical ...

Emily Harley 9 plays

## 22 Qs

Show Answers See Preview 1. Multiple-choice 30 seconds Q.

Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.

Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.

Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.

Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.

Which statement provides the best assessment of his tests?

Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.

Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.

Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.

Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.

2. Multiple-choice 30 seconds Q.

When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening?

The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.

The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.

The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.

The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.

3. Multiple-choice 30 seconds Q.

Which example illustrates a chemical change?

answer choices shredding paper smashing a soda can burning wood chopping wood 4. Multiple-choice 30 seconds Q.

If a person has the values for an object’s density and volume, what value can be calculated?

answer choices the object’s size the object’s mass

the shape the object forms in a container

the amount of space the object takes up

5. Multiple-choice 30 seconds Q.

Which tools would Sara use to find an irregularly shaped object’s mass and volume?

a meter stick, a ruler, and water

a meter stick, a balance, and water

a balance, water, and a ruler

a balance, water, and a beaker

6. Multiple-choice 30 seconds Q.

Chanel has some cotton candy that came in a cloudy shape. She wants to make it more dense. Which describes the candy before and after Chanel manipulated it?

The candy before was a cube, and the candy after was a ball.

The candy before was compacted, and the candy after was fluffy.

The candy before was fluffy, and the candy after was compacted.

The candy before was a ball, and the candy after was a cube.

7. Multiple-choice 30 seconds Q.

Which object would sink in honey, which has a density of 1.4 g/cm³?

Object 1 (0.9 g/cm³)

Object 2 (1.2g /cm³)

Object 3 (0.2 g/cm³)

Object 4 (2.3 g/cm³)

8. Multiple-choice 30 seconds Q.

What is conserved in physical changes?

answer choices Shape Energy Mass Density 9. Multiple-choice 30 seconds Q.

What happens to the total mass of a substance undergoing a physical change?

answer choices It stays the same. It doubles. It triples. It is reduced. 10. Multiple-choice 30 seconds Q.

An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

The boiling point of the nitrogen increased.

The mass of nitrogen increased.

The color changed.

The density changed.

11. Multiple-choice 30 seconds Q.

Which property of physical changes explains why matter is conserved in a physical change?

The arrangements of particles do not change, and the bonds between atoms do not break.

Mass, not energy, changes in a physical change.

Energy and mass change in a physical change.

The bonds between atoms do not break; it is only the arrangement that changes.

12. Multiple-choice 30 seconds Q.

Which characteristic of a substance is considered a chemical property?

answer choices its boiling point its reactivity its density its conductivity 13. Multiple-choice 30 seconds Q.

Which statement best describes what happens during a chemical change?

Both the identity and the properties of a substance change.

Some properties of a substance change, but its identity remains the same.

The chemical properties of a substance change, but its physical properties remain the same.

The physical properties of a substance change, but its chemical properties remain the same.

Source : quizizz.com

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James 17 day ago

Guys, does anyone know the answer?