Questions (51-75 Flashcards

0
Q

Each element in an element family shares the same

A

Number of valence electrons

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1
Q

As the pressure of. A gas at constant temperature decreases, it’s volume

A

Increases

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2
Q

What method for determining buoyant force states that the buoyant force on an object in a fluid is an upward force equal to the weight of the fluid that the object displaced

A

Archimedes’ principle

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3
Q

A chemical property of copper is its

A

Reactivity

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4
Q

Which of the following is an example of a chemical change

A

Paint fading

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5
Q

When two hydrogen atoms bond, the positive nucleus of one atom attracts the

A

Negative electron of the other atom

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6
Q

Which of the following is not a potential sign of chemical change

A

Evaporation. Of water

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7
Q

Because they differ in number of protons in their nuclei and in numbers of electrons in their filled inner energy levels, elements in a group

A

Are not exactly the same

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8
Q

A gas becomes a liquid through a process called

A

Condensation

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8
Q

Which compounds have carbon-carbon double bonds

A

Alkenes

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8
Q

How many atoms are in a single molecule Fe2O3

A

5

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9
Q

The engine of a car left running for long period of time becomes hot because

A

Energy is transferred from burning gasoline

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10
Q

Carbon and other nonmetals are found in which area of the periodic table?

A

On the right side

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10
Q

The mass of a 20L sample of gas with a density of 0.04 mg/L is

A

0.8 (hint: multiply 20 by 0.04)

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11
Q

Democritus’s original atomic theory was revised because it

A

Did not have a scientific basis

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12
Q

A mole is an SI base unit that describes the

A

Amount of a substance