Atomic Theory

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Slicing pepperoni for the topping

Spreading cheese on the pizza

Baking the dough to form the crust

Slide 11

What is the smallest particle of the element gold (Au) that can still be classified as gold?

atom

molecule

neutron

proton

Slide 12

Which of the following illustrations represents a pure substance?

Slide 13

If 1 kg of the compound toluene melts at –95°C, then 500 g of toluene will

melt at –47.5°C.

melt at –95°C.

boil at 95°C.

boil at 47.5°C.

Slide 14

Slide 15

Which statement about the molecules in ice and the molecules in liquid water is correct?

The molecules in ice have more energy than the molecules in liquid water.

The molecules in ice contain different atoms than the molecules in liquid water.

The molecules in ice have more electric charge than the molecules in liquid water.

The molecules in ice are less free to move than the molecules in liquid water.

Slide 16

Which formulas represent compounds?

O2, H2O2

CO2, H2O

H2, CO2

H2, O2

Slide 17

Which is an example of a chemical change?

pepper being ground onto a salad a match being lit sugar being dissolved in water wood being chopped

Slide 18

Which statement is correct concerning the mass of a ball of clay?

The mass changes as the altitude of the ball of clay changes.

The mass changes as the shape of the ball of clay changes.

The mass of the ball of clay is unchanged by altitude or shape.

The mass is doubled when the ball of clay is divided into two equal pieces.

Slide 19

Mary wants to find the density of a small stone. Which tools will she need?

a meterstick and a thermometer a thermometer and a balance a balance and a graduated cylinder a graduated cylinder and a meterstick

Slide 20

If different kinds of atoms are represented by different colored dots, which picture represents a sample of a compound?

Slide 21

If different kinds of atoms are represented by different colored dots, which picture below represents a mixture?