AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S1_2022Covalent Bonds

Compounds Answers

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1
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Carl makes the table below to determine the number of atoms of each element in the chemical formula 4Ca(ClO3)2.

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A
He did not multiply the calcium atoms by the subscript 2.
B
He did not add the coefficient 4 to the chlorine and oxygen atoms.
C
He did not add the subscript 2 to the calcium atoms.
D
He did not multiply the chlorine and oxygen atoms by the coefficient 4.
2
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How many atoms of each element are in 4Na3PO4?

A
3 sodium, 1 phosphorus, 4 oxygen
B
4 sodium, 4 phosphorus, 4 oxygen
C
12 sodium, 1 phosphorus, 4 oxygen
D
12 sodium, 4 phosphorus, 16 oxygen
3

What does the chemical formula CaCl2 show about the compound it represents?

A
It is made up of one element.
B
It is made up of two elements.
C
It is made up of three elements.
D
It is made up of four elements.
4

The compound magnesium phosphate has the chemical formula Mg3(PO4)2. In this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.What does the 2 mean in the formula 5Mg3(PO4)2?

A
There are two elements in magnesium phosphate.
B
There are two molecules of magnesium phosphate.
C
There are two magnesium ions in a molecule of magnesium phosphate.
D
There are two phosphate ions in a molecule of magnesium phosphate.
5

How many atoms of each element are in the chemical formula P2O5?

A
2 phosphorus and 5 oxygen
B
5 phosphorus and 2 oxygen
C
1 phosphorus and 5 oxygen
D
2 phosphorus and 1 oxygen
6

There are several ways to model a compound. One type of model is shown.

Question illustration
A
CHO
B
C4H11O2
C
C6H12O2
D
C6H9O
7

Two models of the same compound are shown.

Question illustration
A
Model A shows the types of elements in the compound, but Model B does not.
B
Model A shows the total number of atoms in the molecule, but Model B does not.
C
Model A shows the three-dimensional shape of the molecule, but Model B does not.
D
Model A shows the number of atoms of each element in the molecule, but Model B does not.
8

How many atoms of nitrogen are in the chemical formula Ni(NO3)2?

A
2
B
1
C
6
D
3
9

Which statement correctly describes why a compound is a pure substance?

A
A compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.
B
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.
C
A compound is not a pure substance because it is not an element, and only elements are pure substances.
D
A compound is a pure substance because it consists of two different elements, which are pure substances.
10

Two models of the same compound are shown.

Question illustration
A
Model B shows the types of elements in the compound, but Model A does not.
B
Model B shows the three-dimensional shape of the molecule, but Model A does not.
C
Model B shows how the atoms in the molecule are connected, but Model A does not.
D
Model B shows the number of atoms of each element in the molecule, but Model A does not.

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