Self Test

Identify the substances below as element or compound

1 pts

To complete the line match

Click on an item in the first group
Click on the match in the second group

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Substance

berkelium

MgO

Hf

ammonia

tin

Correct Answer

Explanation

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

1 pts

Missing

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Explanation

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

1 pts

Have fun and play hangman game to guess the word

Use the alphabet below to guess the word, then enter it in the input field

You have lives

Enter your answer

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Explanation

What does the atomic number tell us about an atom?

1 pts

volume_mute

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

1 pts

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

1 pts

volume_mute

Their outermost electron orbit is full

Their outermost electron orbit is not full

none of the above

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Explanation

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

1 pts

volume_mute

Be (beryllium)

H (Hydrogen)

Ca (calcium)

O (Oxygen)

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Correct Answer

Explanation

What is meant by the atomic mass of an element?

1 pts

volume_mute

the exact mass of the atom, compared to other atoms

The relative mass of the atom, compared to other atoms

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Explanation

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

1 pts

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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Correct Answer

Explanation

What mass of gold (Au) is required to

1 pts

have 10²⁵ gold atoms?

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Explanation

Classify atom particles

1 pts

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Positive

Neutral

Negative

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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

drag and drop the selected option to the right place

Correct Answer

Explanation

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