Unit 1: Introduction to Chemistry Study Guide

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In the scientific method, _____ is the step in which experimental results are used to decide the validity of each hypothesis.

Analysis

In compound the elements are _____ together, whereas in a mixture the substances are blended together.

Bonded

A ____ property of water is that it is unreactive with oil.

Chemical

Sodium Chloride is a (NaCl):

Chemical

hydrochloric acid is a:

Chemical

Is rusting iron a Physical or Chemical change?

Chemical Change

Is dissolving salt in water a physical or chemical change?

Chemical change

Is reacting with sodium to produce sodium hydroxide and water a physical or chemical property?

Chemical property

Chemistry the study of _____ and the changes it undergoes

Chemicals

Copper (II) chloride is a:

Compound

Water is a:

Compound

In the gas state, a substance will have a(n) _____ volume.

Indefinite

Phase changes are classified as _____ changes.

Physical

Is mixing sand and water and physical or chemical change?

Physical Change

Is boiling water a physical or chemical change?

Physical change

Is breaking a glass window physical or chemical change?

Physical change

Is mixing salt & pepper physical or chemical change?

Physical change

Is pulverizing a rock a physical or chemical change?

Physical change

Is a sweet smell a physical or chemical property?

Physical property

Is density = 1.0g/mL an physical or chemical property?

Physical property

Is dissolving in water a physical or chemical property?

Physical property

Is freezing at 0 celsius a physical or chemical property?

Physical property

Is not combustible a physical or chemical property?

Physical property

Is not magnetic a physical or chemical property?

Physical property

Is tasteless and physical or chemical property?

Physical property

A 100 mass is weighed three times on a balance and the following results are obtained: 95.0g, 94.9g, 95.1g, Are these measurements accurate? Are they precise? Explain your answer completely.

Precise, Not accurate. They were all very close together

______ Always have uniform and definite compositions

Pure Substances

Density is a _____ property of a substance

physical

Is boiling water a physical or chemical change?

physical change

Is dissolving a physical or chemical change?

physical change

Is melting butter a physical or chemical change?

physical change

(Iron) 30g + _____ = (Iron (II) sulfide) 40g

(sulfur) 10g

(3.1 x 10^8) x (4.792 x 10^5)

1.5 x 10^14

0.000032 x 0.0000007

2 x 10^-11

How many significant figures are in 0.00250?

3 s.f.

How many significant figures are in 0.135?

3 s.f.

How many significant figures are in 128?

3 s.f.

How many significant figures are in 2050?

3 s.f.

How many significant figures are in 70.0?

3 s.f.

15,000,000,000 / 0.4317

3.5 x 10^10

How many significant figures are in 100.5?

4 s.f.

(1.22 x 10^-13) / (3.445 x 10^6)

4.20 x 10^-7

How many significant figures are in 0.0020300?

5 s.f.

00000000002 / 0.00311

6 x 10^2

How many significant figures are in 24.00000?

7 s.f.

79.321 - 5.9218

7.340 x 10^1

Phosphorus is a:

Element

Potassium is a:

Element

A taco is:

Heterogeneous mixture

Trix Cereal is a:

Heterogeneous mixture

Vanilla ice cream is a:

Homogeneous

Cake batter is a:

Homogeneous Mixture

A penny is:

Homogeneous mixture

In the ____ state, substances have a definite volume and an indefinite shape.

Liquid

_____ Is a measure of the amount of matter in an object.

Mass

Anything that has mass or volume is called ____.

Matter

Paper burning is an example of a _____ change

chemical

Is digesting food a chemical or physical change?

chemical change

_____ is an example of a physical change

freezing

Granite is a:

heterogeneous mixture

_____ zeros are never significant

leading

In a chemical equation the reactants are always written on the _____ side of the arrow.

left


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