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Chemical Reactions FA#5

Science

7th Grade

Used 7+ times

Chemical Reactions FA#5
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12 questions

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1.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Energy cannot be created or destroyed, it just changes form. This principle is known as what?

Conservation of matter

endothermic reaction

Answer explanation

remember, energy cannot just disappear! It must go somewhere or transfer into different forms

2.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

The atomic number of an element is also known as what?

# of protons

# of electrons

#of neutrons

mass number

Answer explanation

this is always above an elements name

3.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

For any neutral atom on the periodic table, the # of protons are equal to what?

# of electrons

#of neutrons

atomic weight

# of compounds

Answer explanation

Protons and electrons will always be the same for any neutral atom!

4.

OPEN ENDED QUESTION

2 mins • Ungraded

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How many iron atoms are in the compound?

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Answer explanation

there are 4 Fe (iron atoms).....2 on the outside is the coefficient and the 2 is the subscript for Fe

5.

OPEN ENDED QUESTION

2 mins • Ungraded

Media Image

How many total carbon dioxide compounds are present?

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Answer explanation

There are 5 total carbon dioxide compounds since there is a 5 coefficient in front

6.

OPEN ENDED QUESTION

2 mins • Ungraded

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How many total oxygen atoms are present?

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Answer explanation

10


The 5 indicates how many total carbon dioxide compounds and since there are 2 oxygens (as indicated by the subscript), you have to multiply the 5 times 2.

7.

OPEN ENDED QUESTION

2 mins • Ungraded

Carbon has an atomic # of 6. How many protons does carbon have?

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Answer explanation

6, since the atomic # is the same # of protons in an atom

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