Chemistry- Unit 1 Test

Matter

Anything that takes up space and has mass

Pure Substance

Anything that has a fixed chemical composition and can’t be broken down physically

Element

A pure substance that is made of only one kind of atom

Compound

A substance that is made from the atoms of two or more types of atoms that are chemically bonded to one another

Heterogenous mixture

A mixture in which the components do not have a uniform composition

Extensive property

properties that change when the amount of the sample changes

Extensive examples

Mass, length, and volume

Physical property

A property that can be observed without changing the identity of the substance

Chemical property

A property that can only be observed by changing the identity of the substance

Solubility

The ability of a substance to dissolve in another

Burning, rusting, and reacting with another substance are examples of __________ changes.

chemical

Malleability, ductility, and flamability are all _______________

properties (descriptions)

Energy and mass must be conserved during a physical or chemical change, right gang?

conserved- maintain (a quantity such as energy or mass) at a constant overall total.

ya lol

This image shows one type of atom. What best describes what this image represents?

an element

The ability for a substance to be hammered into a thin sheet is

malleability

Your ice melts in your water bottle. This is an example of a(n)

psysical change

A substance has a mass of 10 g and a volume of 2 mL. What is its density?

5g/ml

The image below shows two types of atoms bonded together. What best describes what this image represents?

mixture of compounds

Independent variable

What you change

A factor you change or control in an experiment, which you believe will influence another variable

Dependent variable

What you measure

A factor you measure or observe, which you think will change due to the independent variable

Property

The description of an object

If lightning strikes the tree will burn

The tree is 5 m high
The tree is GREEN)

Properties of matter can be

physical or chemical

Physical Properties (the def is simple and ez)

Are determined by the use of the five senses.

They are a  description of an object.

(touch, hear, see, taste, smell)

Chemistry

the study of matter and the changes it undergoes

Ozone layer

located in the stratosphere (10-50 km above Earth)

made up of oxygen

a substance in the atmosphere that absorbs most harmful radiation before it reaches Earth’s surface.

Substance

also known as a chemical

matter that has a definite and uniform composition

a chemical is also known as

a substance

(matter that has a definite and uniform composition)

How is O2 formed?

Ultraviolet radiation from the Sun causes some oxygen gas ( O 2 )

Ultraviolet Radiation

If you have ever had a sunburn, you have experienced the damaging effects of ultraviolet radiation from the Sun.