Science- Chemical and Physical Changes

oxygen reacted with the apple and turned it brown

A sliced apple left on the counter over night will turn brown. Explain the chemical reaction that took place.

Production of Precipitate

A solid substance that forms and separates from a solution.

Determine if a new substance with new properties has formed

How can you determine that a chemical change has occured?

add volume to the object

How can you make a dense material float?

Cold

Ice packs contain chemicals that become _______ when they react.

Oxidation- oxygen reacted with the apple

What caused the apple to change from white to brown?

When a substance rapidly combines with oxygen

What causes a combustion to occur?

light

What does burning wood or paper produce?

A flame that gives off thermal energy and light

What does combustion produce?

Chunky solid substance

What does the precipitate from combining milk and lemon juice look like?

thermal energy and light is produced and it glows

What happens when you agitate (shake) the chemicals in a glow stick?

Matter made of two or more types of atoms

What is a compound?

Matter made of a single type of atom

What is an element?

rusting; chemical

What occurs when a piece of iron or steel is exposed to water and oxygen over a period of time? Is it chemical or physical change?

baking soda and vinegar

What two common household items can you mix together to form a chemical change?

new substance or new property

What two things does a chemical change give off?

thermal energy and light

What two things does combustion give off?

Elements and Compounds

What two things from the passage can identify a specific type of matter?

Chemical- gas

What type of change causes the carbon dioxide to produce?

bubbles

When a GAS is produced in a REACTION involving a liquid, what is produced?

Physical Change

A change that involves changes to a substance's physical properties only.

Chemical Change

A change that involves changes to the physical and chemical properties of a substance.

Chemical Process

A process of chemical change happening

Physical Properties

A property that you can observe without changing the matter itself.

Chemical Properties

Different types of matter, including elements and compounds, have no different properties.

float

If an object is less dense, will it float or sink?

sink

If an object is more dense, will it float or sink?

chemical, physical, color, magnetic, electricity, density

List the 6 properties of matter: CPCMED

Color Change

The change in color, from white to brown. It provides evidence that a chemical reaction has happened.

Metals

What are dense because they have a great deal of matter packed into a small volume?

rusting, burning, exploding, rotting, bubbling

What are some examples of chemical changes?

chopping, melting, sanding, painting, folding

What are some examples of physical changes?

Physical property

This is a property you can observe without changing the matter itself.

Rust

This is a red flaky crust that crumbles easily. It can't change back to iron.

precipitate

This is a solid substance that forms and separates from a solution.

Production of Gas

This is produces in a reaction involving a liquid, bubbles form.

color change, light formation, gas bubbles, temperature change, precipitate

What are 5 evidences of Chemical change?

Production of Heat or Light

When a substance rapidly combines with oxygen, combustion occurs, producing a flame that gives off thermal energy and light.

The gas from the flame

When you burn a log, large amounts of heat is given off. What kind of evidence shows that it's a chemical change?

Carbon dioxide

When you combine baking soda and vinegar, the reaction that you see are bubbles of _____________ gas being produced.

a precipitate

When you combine lemon juice, milk, curdling occurs. What else forms?

react

When you freeze an ice pack, you cause the chemicals to connect to each other and _______

The very bottom

Where does a precipitate often settle in a liquid?

Chemical

Which change cannot be reversed? Physical or Chemical?

density

what is the amount of matter packed in a specific volume?