Quiz about Topic 1 SL Chemistry Stoichiometry

Question 1

Which is correct?

Accepted Answer

Mixtures are either homogeneous or heterogeneous and the components retain their individual chemical properties.

Answer

Mixtures are either homogeneous or heterogeneous and their chemical properties are an average of the individual component properties.

Answer

Mixtures are never heterogeneous and their chemical properties are an average of the individual component properties.

Answer

Mixtures are never homogeneous and the components retain their individual chemical properties.

Question 2

Which diagram represents a heterogeneous mixture?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 3

Which is a homogeneous mixture?

Accepted Answer

Ethanol and water

Answer

Oil and water

Answer

Sand and water

Answer

Chalk and sand

Question 4

Which statements about mixtures are correct?

I.The components may be elements or compounds.

II.All components must be in the same phase.

III.The components retain their individual properties.

Accepted Answer

I and III only

Answer

I and II only

Answer

II and III only

Answer

I, II and III

Question 5

Some sodium chloride is dissolved in water. Which term describes the role of sodium chloride in this process?

Accepted Answer

Solute

Answer

Solvent

Answer

Solution

Answer

Saturated

Question 6

Which contains the greatest number of moles of oxygen atoms?

Accepted Answer

0.05 mol Mg(NO₃)₂

Answer

0.05 mol C₆H₄(NO₂)₂

Answer

0.1 mol H₂O

Answer

0.1 mol NO₂

Question 7

What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass?

Accepted Answer

CH4

Answer

C3H

Answer

CH2

Answer

C2H6

Question 8

16 g of bromine react with 5.2 g of metal, M, to form MBr₂. What is the relative atomic mass of the metal M? (A_r: Br = 80)

Accepted Answer

52

Answer

13

Answer

26

Answer

104

Question 9

Which compound has the greatest percentage by mass of nitrogen atoms?

Accepted Answer

N2H4

Answer

NH3

Answer

N2O4

Answer

NaNO3

Question 10

A compound with M_r = 102 contains 58.8 % carbon, 9.80 % hydrogen and 31 % oxygen by mass.

What is its molecular formula?

A_r: C = 12.0; H = 1.0; O = 16.0

Accepted Answer

C₅H₁₀O₂

Answer

C₂H₁₄O₄

Answer

C₃H₄O₄

Answer

C₆H₁₄O

Question 11

What is the total number of protons and electrons in one mole of hydrogen gas?

Accepted Answer

$2.4\ x\ 10^{24}$

Answer

2

Answer

4

Answer

$2.4\ x\ 10^{24}$

Question 12

For which compounds is the empirical formula the same as the molecular formula?

I. Methane

II. Ethene

III. Ethanol

Accepted Answer

I and III only

Answer

I and II only

Answer

II and III only

Answer

I, II and III

Question 13

Which represents an empirical formula?

Accepted Answer

$$Al_2O_3$$

Answer

$$C_2H_4$$

Answer

$$B_2H_6$$

Answer

$$C_6H_6$$

Question 14

Which is the best description of relative atomic mass, A_r?

Accepted Answer

The weighted mean mass of naturally occurring isotopes of an element compared to 1/12^thof the mass of an atom of carbon-12

Answer

The number of neutrons and protons present in the nucleus of an atom

Answer

The average number of neutrons and protons in all isotopes of an element

Answer

The weighted mean mass of naturally occurring isotopes of an element compared to the mass of an atom of carbon-12

Question 15

What is the number of ions in 0.20 moles of (NH₄)₃PO₄?

Accepted Answer

$$4.8\ x\ 10^{23}$$

Answer

$$8.0\ x\ 10^{-1}$$

Answer

$$1.2\ x\ 10^{23}$$

Answer

$$2.4\ x\ 10^{24}$$

Question 16

What is the total number of atoms in 0.100 mol of Pt(NH₃)₂Cl₂?

Accepted Answer

$$6.62\ x\ 10^{23}$$

Answer

11

Answer

$$6.02\ x\ 10^{22}$$

Answer

$$3.01\ x\ 10^{23}$$

Question 17

The relative molecular mass of a gas is 56 and its empirical formula is CH₂. What is the molecular formula of the gas?

Accepted Answer

$$C_4H_8$$

Answer

$$CH_2$$

Answer

$$C_2H_4$$

Answer

$$C_3H_6$$

Question 18

What is the total number of nitrogen atoms in two moles of NH₄NO₃?

Accepted Answer

$$2.41\ x\ 10^{24}$$

Answer

$$4$$

Answer

$$6.02\ x\ 10^{23}$$

Answer

$$1.20\ x\ 10^{24}$$

Question 19

300cm³ of water is added to a solution of 200cm³ of 0.5moldm^-3 of sodium chloride. What is the concentration of sodium chloride in the new solution?

Accepted Answer

$$0.2\ mol\ dm^{-3}$$

Answer

$$0.05\ mol\ dm^{-3}$$

Answer

$$0.1\ mol\ dm^{-3}$$

Answer

$$0.3\ mol\ dm^{-3}$$

Question 20

Which non-metal forms an oxide XO₂with a relative molecular mass of 60?

Accepted Answer

Si

Answer

C

Answer

N

Answer

S

Question 21

4.00 mol of a hydrocarbon with an empirical formula of CH₂ has a mass of 280 g. What is the molecular formula of this compound?

Accepted Answer

$$C_5H_{10}$$

Answer

$$C_2H_4$$

Answer

$$C_3H_6$$

Answer

$$C_4H_8$$

Question 22

The molar mass of a compound is approximately 56 gmol^-1. Which formula is possible for this compound?

Accepted Answer

KOH

Answer

NaNO3

Answer

AgOH

Answer

MgO

Question 23

What is the volume of gas when the pressure on 100 cm³ of gas is changed from 400 kPa to 200 kPa at constant temperature?

Accepted Answer

200 cm3

Answer

50.0 cm3

Answer

100 cm3

Answer

800 cm3

Question 24

What is the volume of gas when the pressure on 100 cm³ of gas is changed from 400 kPa to 200 kPa at constant temperature?

Accepted Answer

200 cm3

Answer

50.0 cm3

Answer

100 cm3

Answer

800 cm3

Question 25

Which graph shows the relationship between the volume and pressure of a fixed mass of an ideal gas?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 26

In which mixture is NaOH the limiting reagent?

Accepted Answer

0.10mol NaOH + 0.10mol H₂SO₄

Answer

0.20mol NaOH + 0.10mol H₂SO₄

Answer

0.20mol NaOH + 0.10mol HNO₃

Answer

0.10mol NaOH + 0.10mol HNO₃

Question 27

Why do gases deviate from the ideal gas law at high pressures?

Accepted Answer

Molecules have finite volume.

Answer

Cohesive forces increase the volume from the ideal.

Answer

Increasing pressure increases the temperature of the gas.

Answer

Collisions between molecules occur more frequently as pressure increases.

Question 28

Which solution contains the biggest amount, in mol, of chloride ions?

Accepted Answer

60cm³ of 0.20mol dm^-3 of MgCl₂

Answer

20cm³ of 0.50mol dm^-3 of NH₄Cl

Answer

70cm³ of 0.30mol dm^-3 of NaCl

Answer

100cm³ of 0.30mol dm^-3 of ClCH₂COOH

Question 29

Which volumes of gases at standard temperature and pressure have the same mass as 100 cm³ of O₂?

I. 50 cm³ of SO₂

II. 100 cm³ of CH₄

III. 100 cm³ of SiH₄

Accepted Answer

I and III only

Answer

I and II only

Answer

II and III only

Answer

I, II and III

Question 30

When 50 cm³ of a hydrocarbon, CxHy, was burned in excess oxygen, 200 cm³ of carbon dioxide and 250 cm³ of steam were produced (all volumes were measured under the same conditions).

What is the molecular formula of the hydrocarbon?

Accepted Answer

$$C_4H_{10}$$

Answer

$$C_2H_4$$

Answer

$$C_3H_8$$

Answer

$$C_4H_8$$

Question 31

Which graph represents the relationship between volume and pressure for a fixed mass of gas at constant temperature?A

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 32

What is the amount, in moles, of sulfate ions in 100 cm³ of 0.020 mol/L FeSO₄(aq)?

Accepted Answer

$$2.0\ x\ 10^{-3}$$

Answer

$$2.0\ x\ 10^{-2}$$

Answer

$$2.0\ x\ 10^{-1}$$

Answer

$$2$$

Question 33

1.7 g of NaNO₃ (Mr=85) is dissolved in water to prepare 0.20 dm³ of solution. What is the concentration of the resulting solution in mol/L?

Accepted Answer

0.1

Answer

0.01

Answer

0.2

Answer

1.0

Question 34

What is the concentration of NaCl, in mol/L, when 10.0 cm³ of 0.200 mol/L NaCl solution is added to 30.0 cm³ of 0.600 mol/L NaCl solution?

Accepted Answer

0.500

Answer

0.450

Answer

0.300

Answer

0.800

Question 35

Four identical containers under the same conditions are filled with gases as shown below. Which container and contents will have the highest mass?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Topic 1 SL Chemistry Stoichiometry

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science