Self Test

Identify the substances below as element or compound

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volume_mute

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Substance

berkelium

MgO

Hf

ammonia

tin

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Explanation

What do we call the smallest unit an element can be broken into and still the same properties?

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Missing

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Explanation

What do we call the smallest unit of a compound that retains the properties of the compound?

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volume_mute

Lives: 10

Your Answer (Missing Word):

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Explanation

What does the atomic number tell us about an atom?

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the number of protons

the number of neutrons

the number of electrons

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Explanation

Use the periodic table to find the elements

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with atomic number 27 (1)
with atomic mass 238 (2)

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Co (cobalt)

O (Oxygen)

U (uranium)

H (Hydrogen)

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Correct Answer

Explanation

Explain, on the basis of electron orbit, why gases such as helium do not enter into chemical reactions

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Their outermost electron orbit is full

Their outermost electron orbit is not full

none of the above

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Correct Answer

Explanation

The magnesium atom has two electrons in its outer orbit. Name two other elements whose atoms have this characteristic

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volume_mute

Be (beryllium)

H (Hydrogen)

Ca (calcium)

O (Oxygen)

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Explanation

What is meant by the atomic mass of an element?

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the exact mass of the atom, compared to other atoms

The relative mass of the atom, compared to other atoms

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Correct Answer

Explanation

Use the periodic table to find the atomic number and atomic mass of sodium (Na).

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atomic number = (1)

atomic mass = (2)

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Explanation

How many molecules are contained in 2.8 grams of carbon monoxide (CO)?

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volume_mute

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Explanation

What mass of gold (Au) is required to

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have 10²⁵ gold atoms?

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Correct Answer

Explanation

Classify atom particles

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volume_mute

proton

electron

neutron

Positive

Neutral

Negative

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volume_mute

Identify the substances below as element or compound

Substance

Category

Correct Answer

Explanation

What do we call the smallest unit an element can be broken into and still the same properties?

Correct Answer

Explanation

What do we call the smallest unit of a compound that retains the properties of the compound?

Correct Answer

Explanation

What does the atomic number tell us about an atom?

Correct Answer

Explanation

Use the periodic table to find the elements

Correct Answer

Explanation

Explain, on the basis of electron orbit, why gases such as helium do not enter into chemical reactions

Correct Answer

Explanation

The magnesium atom has two electrons in its outer orbit. Name two other elements whose atoms have this characteristic

Correct Answer

Explanation

What is meant by the atomic mass of an element?

Correct Answer

Explanation

Use the periodic table to find the atomic number and atomic mass of sodium (Na).

Correct Answer

Explanation

How many molecules are contained in 2.8 grams of carbon monoxide (CO)?

Correct Answer

Explanation

What mass of gold (Au) is required to

Correct Answer

Explanation

Classify atom particles

Correct Answer

Explanation

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