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Section 2. Section 2. Section 1. Section 1. Section 1 & 2. 1pt. 1 pt. 1 pt. 1pt. 1 pt. 2 pt. 2 pt. 2pt. 2pt. 2 pt. 3 pt. 3 pt. 3 pt. 3 pt. 3 pt. 4 pt. 4 pt. 4pt. 4 pt. 4pt. 5pt. 5 pt. 5 pt. 5 pt. 5 pt.

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Presentation Transcript
slide1

Section 2

Section 2

Section 1

Section 1

Section

1 & 2

1pt

1 pt

1 pt

1pt

1 pt

2 pt

2 pt

2pt

2pt

2 pt

3 pt

3 pt

3 pt

3 pt

3 pt

4 pt

4 pt

4pt

4 pt

4pt

5pt

5 pt

5 pt

5 pt

5 pt

slide2

The minimum amount of energy that has to be added to start a reaction is the

Exothermic energy

Endothermic energy

Activation energy

Chemical energy

slide4

Which of the following does NOT increase the number of particles of a substance available to react in a chemical reaction?

Increasing the concentration

Increasing the surface area

Adding a catalyst

Increasing the mass

slide8

Which of the following is an example of how to supply activation energy to begin a reaction?

Cool the reaction flask in an ice bath

Add a catalyst

Heat the reaction flask on a hot plate

Add an inhibitor

slide10

Chemicals that act as biological catalysts by speeding up reactions in living things are

Inhibitors

Enzymes

Fuels

Reactants

slide12

Explain the following in terms of factors that affect the rate of a chemical reaction.

A) Chemical reactions in living things would not be possible without the enzymes found in cells.

slide13

Enzymes are catalysts. They speed up chemical reactions by lowering the activation energy of reactions needed for life. Without the presence of enzymes in cells, the reactions in living things would occur too slowly or require temperatures that are too high for cells to survive.

slide14

Explain the following in terms of factors that affect the rate of a chemical reaction.

B) Wood burns at a steady rate, but sawdust may explode if a spark ignites it. (Sawdust is tiny particles of wood made from sawing wood.).

slide15

Sawdust has a greater surface area than wood. Increased surface area of a reactant will increase the rate of a chemical reaction. In this case, more of the reactant (sawdust) will come in contact with oxygen, so a spark is enough to start an explosion.

slide16

The minimum amount of energy that has to be added to start a reaction is the

Exothermic

Edothermic energy

Activation energy

Chemical energy

slide18

Table sugar and table salt are examples of

Atoms

Elements

Mixtures

Pure substances

slide20

Substances that CANNOT be broken down chemically into other substances

Elements

Compounds

Mixtures

Solutions

slide22

All elements are composed of extremely small particles called

Compounds

Mixtures

Atoms

Molecules

slide24

Which of these statements is false?

Oxygen and copper are examples of elements.

Elements are pure substances.

Atoms of different elements can combine to form compounds.

Atoms of different elements are the same.

slide26

What holds atoms together in a molecule?

Density

Gravity

Physical bonds

Chemical bonds

slide28

Anything that has mass and takes up space is called

Matter

Energy

Heterogeneous

Homogeneous

slide30

Lemonade consists of several substances that are NOT chemically combined, so lemonade is classified as a(n)

Element

Compound

Mixture

Pure substance

slide32

If you heat a liquid and measure the temperature at which it boils, you are measuring a(n)

Atomic property

Physical property

Chemical property

Molecular property

slide34

If you describe methane as a gas that easily catches fire, you are describing a

State of matter

Physical property

Chemical property

Chemical formula

slide36

H2O, CO2, and C12H22O11 are

all examples of chemical

Properties

Changes

Bonds

Formulas

slide38

Soil, a salad, and sugar water are all examples of

Elements

Compounds

Mixtures

Atoms

slide41

A mixture consists of two or more substances that are mixed together but are not chemically combined. The individual substances in a mixture keep their separate properties. A compound is a substance formed when two or more elements combine chemically. The properties of a compound are very different from those of the elements that formed it.

slide43

You could investigate some of the characteristic properties of the unknown substance. If the unknown substance is water, it will have the same freezing point, the same boiling point, the same density, and the same chemical reactivity as water.

slide45

Atoms are the smallest particles of an element. Atoms can combine with other atoms to form molecules. A molecule is a group of atoms that are joined together and act as a single unit.

Molecules can be made of different kinds of atoms or the same kind of atoms. Atoms within a molecule are held together by chemical bonds.

slide46

Circle the letter of each mixture below that is heterogeneous

Damp soil

Sugar water

Brass

Salad

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