Answers26-27 WHS-Chemistry-1stSixWeeksThe History and Arrangement of the Periodic Table

The History and Arrangement of the Periodic Table — Unit test Answers

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1
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Which equation is a decomposition reaction?

A
Li2CO3 Li2O + CO2
Option A
B
Zn + HCl ZnCl2 + H2
Option B
C
Na2O + CO2 Na2CO3
Option C
D
C6H12O6 + O2 CO2 + H2O
Option D
2
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Chemists use activity series to determine whether which type of reaction will occur?

A
combustion
B
double replacement
C
decomposition
D
single replacement
3

This formula equation is unbalanced.BaCl2(aq) + Na2CO3(aq) BaCO3(s) + NaCl(aq) Which coefficient should be placed in front of NaCl to balance this equation?

Question illustration
A
1
B
2
C
3
D
4
4

In which two types of reactions do opposite chemical changes occur?

A
double replacement and combustion
B
single replacement and double replacement
C
synthesis and decomposition
D
combustion and synthesis
5

An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.BF3 + Li2SO3 B2(SO3)3 + LiFWhat is the coefficient of lithium fluoride in the balanced chemical reaction?

Question illustration
A
1
B
3
C
4
D
6
6

Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction?

A
sodium hydroxide + water sodium + hydrogen
Option A
B
sodium + water sodium hydroxide + hydrogen
Option B
C
sodium + hydrogen sodium hydroxide + water
Option C
D
sodium + sodium hydroxide water + hydrogen
Option D
7

If a substance reacts with oxygen, the chemical reaction is most likely a

A
combustion reaction.
B
decomposition reaction.
C
single replacement reaction.
D
double replacement reaction.
8

Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?

A
oxygen + lithium oxide lithium
Option A
B
lithium + oxygen lithium oxide
Option B
C
oxygen + lithium lithium + oxide
Option C
D
lithium oxide lithium + oxygen
Option D
9

Which statement is true about an empirical formula?

A
It is the true ratio of atoms in a formula unit.
B
It is the simplest ratio of atoms in a formula unit.
C
It represents the true molecular mass of a chemical formula.
D
It represents the highest ratio of coefficients in a chemical formula.
10

What is the percent by mass of water in Na2SO4 • 10H2O?Use .

Question illustration
A
5.59%
B
11.26%
C
44.08%
D
55.92%
11

What is the empirical formula for propene (C3H6)?

A
C2H4
B
C4H8
C
C3H6
D
CH2
12

If a compound has a molar mass of 180 g/mol and its empirical formula is CH2O, what is its molecular formula?

A
CH2O
B
C2H4O2
C
C6H12O6
D
C12H22O11

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