8th grade quiz T3-3

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8th grade quiz T3-3

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You are baking sourdough bread. You put 5 cups of flour and 1.5 cups of water together and whisk them thoroughly. You have just made a:

1 point

Compound

Element

Homogenous mixture

Heterogenous mixture

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After you whisk the flour and water together, you add yeast. After a few hours, the dough "rises" because carbon dioxide is formed when the yeast breaks down the sugars in the bread. This is an example of a:

1 point

Chemical change

Physical change

Element

Heterogenous mixture

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The Periodic Table shows all of the ______ in the world.

1 point

Compounds

Heterogenous mixtures

Elements

Liquids

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Which of the following is the best example of a heterogenous mixture?

1 point

A closed can of Coke

The baking soda and vinegar experiment from yesterday's lab

Cookie batter

A scoop of garden soil

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Which of the following is NOT a physical property?

1 point

Mass

Length

Flammability

Color

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Which of the following is a chemical property of copper?

1 point

Copper is highly conductive; it has a low specific heat and electricity travels through it quickly

Copper has a high luster; it is quite shiny and smooth

Copper will react with oxygen in the air to make a green patina; this is why the Statue of Liberty is green

Copper has a relatively low density; it will float in water

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You are studying an unknown pink liquid in your chemistry class. Yesterday, you only had 100 mL of the pink liquid. Today, you were able to find 500 mL of the pink liquid. Which of the following physical properties of the pink liquid will DEFINITELY be the same as it was yesterday?

1 point

The pink liquid will have the same color as it did yesterday

The pink liquid will have the same density as it did yesterday

The pink liquid from the day before will have the same mass as the pink liquid you are studying today

The pink liquid from the day before will have the same volume as the pink liquid you are studying today

The first 2 answers are both correct

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Which of the following is NOT a clue that a chemical change has a occurred?

1 point

A liquid changes into a solid

A new odor appears

A new gas is formed

A new substance is formed that is a new color

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Which of the following is NOT a physical change?

1 point

An onion being diced

Garlic being crushed into small peices

Oil being heated up slowly in a pan

An onion turning translucent and smelling sweet after being cooked slowly

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Which of the following is NOT a chemical change?

1 point

Food coloring being mixed into water

A cake baking in the oven

Cabbage fermenting in sauerkraut from wild yeast (hint: it smells very different from cabbage)

Cheese being made from milk by adding acid to make curds and whey

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