Free Printable IB Chemistry - Topic 1

1.

What is the formula for calculating number of moles of atoms?

a)

$\frac{molar\ mass}{mass}$

b)

$mass\ \times\ molar\ mass$

c)

$\frac{mass}{molar\ mass}$

2.

How many moles of hydrogen gas are produced when 3 mol of aluminium react with excess hydrochloric acid in the following equation?

$2Al\ \left(s\right)\ +\ 6HCl\ \left(aq\right)\ \rightarrow\ 2AlCl_3\ \left(aq\right)+\ 3H_2\ \left(g\right)$

a)

3

b)

6

c)

4.5

d)

9

3.

What is the total number of hydrogen atoms in 1.0 mol of benzamide?

$C_6H_5CONH_2$

a)

$7$

b)

$4.2\times10^{24}$

c)

$6.0\times10^{23}$

d)

$3.0\times10^{24}$

4.

What is the coefficient of $Fe_3O_4$ when the following equation is balanced using the lowest whole numbers?

$?Al(s)+\ ?Fe_3O_4(s)\ →\ ?Al_2O_3(s)+\ ?Fe(s)$

a)

2

b)

3

c)

4

d)

5

5.

A fixed mass of gas has a certain volume at a temperature of 50 °C. What temperature is required to double its volume while keeping the pressure constant?

a)

100 K

b)

323 K

c)

373 K

d)

646 K

6.

Finish this statement of Avogadro's Law:

Equal volumes of all gases, when measured at the same temperature and pressure, ...

a)

...have the same number of particles.

b)

...will react at equal rates.

c)

...will have the same mass.

d)

...have the same density.

7.

The graph represents the relationship between two variables in a fixed amount of gas.

Which variables could be represented by each axis?

a)

x: pressure

y: temperature

b)

x: volume

y: temperature

c)

x: pressure

y: volume

d)

x: temperature

y: volume

8.

A hydrocarbon contains 90% by mass of carbon. What is its empirical formula?

a)

$CH_2$

b)

$C_3H_4$

c)

$C_7H_{10}$

d)

$C_9H_{10}$

9.

What is $1\ dm^3$ equal to?

a)

$1\ mL^{ }$

b)

$100\ cm^3$

c)

$0.001\ cm^3$

d)

$1000\ cm^3$

10.

How do you calculate the number of moles of NaCl in $mol\ dm^{-3}$ for $10.0\ cm^3$ of $0.200\ mol\ dm^{-3}$ solution?

a)

$10\ \times0.200$

b)

$\frac{10}{0.200}$

c)

$\frac{0.200}{0.010}$

d)

$0.010\ \times\ 0.200$

IB Chemistry - Topic 1 - Stoichiometry

Total questions: 10

Worksheet time: 20mins

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