Free Printable CHEM RACE

1.

1 mole has how many particles?

a)

1

b)

$6.022\times10^{23}$

c)

6

d)

549238.66

2.

What is a limiting reactant?

a)

the reactant that determines how much product can be made

b)

the reactant that is in excess

c)

the product that you can make the most of

d)

the amount of reactants that react with each other

3.

Theoretical yield = 73g

Actual yield = 62g

Calculate the percent yield.

a)

18%

b)

118%

c)

85%

d)

15%

4.

What is the molarity of 1.2 moles of CaCO₃ in 1.22 L of solution?

a)

0.98 M

b)

9.8 M

c)

5.11 M

d)

0.16 M

5.

Is this equation balanced?

a)

Yes, everything appears the same amount on each side.

b)

No, there are too many hydrogen on the left side.

c)

No, there are too many oxygen on the left side.

6.

The electron configuration of an atom is $1s^22s^22p^6$ The number of electrons in the atom is

a)

3

b)

5

c)

6

d)

10

7.

Hunds rule states:

a)

lower energy orbitals fill before higher energy orbitals

b)

one electron goes into each orbital until all of them are half full before pairing up.

c)

no two electrons can be identified by the same set of quantum numbers (i.e. must have different spins).

d)

the position and the velocity of an electron cannot both be measured exactly, at the same time, even in theory.

8.

Electronegativity is...

a)

how good an atom is at attracting electrons

b)

the ability of an atom to lose electrons

c)

the energy required to remove an electron from a specific atom

d)

how easy it is to make friends.

9.

Ionisation energy is:

a)

the minimum amount of energy required to remove the outermost electron from an atom in its solid state

b)

the maximum amount of energy required to remove the outermost electron from an atom in its gaseous state

c)

the minimum amount of energy required to remove the outermost electron from an atom in its gaseous state

d)

none of the above

10.

According to the Octet Rule, atoms of elements react with each other in order to attain ____ electrons in their outermost energy level or shell.

a)

2

b)

6

c)

8

d)

10

11.

What is the correct Lewis Structure for ammonia NH3

a)

b)

c)

d)

12.

Choose the correct shape for this molecule:

a)

Bent

b)

Linear

c)

Tetrahedral

d)

Trigonal pyramidal

13.

Which of the following molecules, based on the elements present, would be most polar?

a)

HF

b)

H₂

c)

HCl

d)

HBr

14.

For the reaction, choose the CORRECT equilibrium constant, K_c.

a)

b)

c)

d)

15.

What is the Kc expression for the reaction below:
SOCl2(g) + H2O(g) ⇌ SO2(g) + 2HCl(g)

a)

$\frac{[SO_2][2HCl]}{[SOCl_2][H_2O]}$

b)

$\frac{[SO_2][HCl]^2}{[SOCl_2][H_2O]}$

c)

$\frac{[SOCl_2][H_2O]}{[SO_2][2HCl]}$

d)

$\frac{[SOCl_2][H_2O]}{\left[[SO_2\right][2HCl]}$

16.

According to Arrhenius, what is the definition of an ACID?

a)

a substance that contains hydroxide and ionizes to produce OH-

b)

a substance that contains hydrogen and ionizes to produce H+

c)

a substance that contains hydrogen and ionizes to produce OH-

d)

a substance that contains hydroxide and ionizes to produce H+

17.

if a solution has a pOH of 5.2 the [OH-] of the solution is

a)

6.3 x 10 ^-6 M

b)

7.0 x 10 ^-10 M

c)

1.58 x 10^-5 M

d)

2 x 10^-5 M

18.

If the [H₃O⁺] of a solution is 6.8 x 10^-8 M, the pH is

a)

7.17

b)

3.2 x 10^-5

c)

7.2

d)

7.62

19.

According to Bronsted-Lowry, what is the definition of an BASE?

a)

a substance that donates a hydrogen (H+) ion

b)

a substance that donates a hydroxide (OH-) ion

c)

a substance that accepts a hydrogen (H+) ion

d)

a substance that accepts a hydroxide (OH-) ion

20.

All the systems below are homogeneous equilibria EXCEPT

a)

2PCl₃ (g) + O₂ (g) ⇌ 2POCl₃ (g )

b)

FeO (s) + CO (g ) ⇌ Fe(s) + CO₂ (g )

c)

Ag⁺ (aq) + Fe²⁺ (aq) ⇌ Ag (s) + Fe³⁺ (aq)

d)

N₂O₄ (g) ⇌ 2NO₂ (g)

CHEM RACE

Total questions: 20

Worksheet time: 20mins

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