Study Guide Flashcards

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1
Q

What is a variable?

A

Something that can be changed

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2
Q

What is a fair test?

A

To do several tests using the same amount of time, ingredients, etc.

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3
Q

Are all types of metal magnetic? How do you know?

A

No, because some metals are too weak

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4
Q

What happens when you mix baking soda and vinegar?

A

It fizzes and bubbles, a chemical reaction occurs

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5
Q

Why would you connect a balloon, a light bulb, and a battery with wires?

A

To see if the balloon conducts electricity and lights the bulb

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6
Q

What is the purpose of a scale?

A

To see how much something weighs (in grams?)

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7
Q

When designing a backpack for outdoor use, what characteristics and/or qualities would be beneficial?

A

For it to be strong, waterproof, non-transparent, etc.

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8
Q

When we mix two substances together what happens to the weight of the new mixture?

A

The weight of the new mixture is the combination of the 2 substances together. It stays the same

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9
Q

What happens when we mix iodine with different substances?

A

The color changes, has starch, or repels

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10
Q

What is a chemical reaction/change?

A

When a new substance is formed

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11
Q

What are indicators that a chemical reaction has happened?

A

The color changes, different mass, doesn’t go back to its original state

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12
Q

What is a physical reaction/change?

A

ice - water - steam
solid - liquid - gas
chocolate - melted chocolate

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13
Q

What are indicators that a physical change has happened? It typically changes the appearance of a substance/object.

A

Changed the appearance of a substance/object, it can go back to its original state

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14
Q

What can we say about the properties of the new mixture if there is no chemical change?

A

It’s a physical change

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15
Q

Why did the Statue of Liberty change color over the years?

A

Carbon dioxide—-gases in the air—-copper dioxidation

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