Free Printable Mass calculations

Worksheets

Mass calculations

Total questions: 27

Worksheet time: 20mins

Name

Class

Date

In order for an atom to be neutral what has to be true?

The atom has more protons than neutrons

The atom has more neutrons than protons

The atom has the same number of protons and neutrons

The atom has the same number of protons and electrons

What is the combined mass of all the protons and neutrons of an atom and is approximately equal to the number of protons and neutrons?

atomic mass

atomic number

subatomic particles

nucleus weight

What is a subatomic particle without an electric charge, located in the nucleus of an atom?

neutron

proton

electron

valence electron

Most of the mass in an atom is made up of _____________________?

protons and electrons

protons and neutrons

neutrons and electrons

electrons and quarks

What is a subatomic particle with a positive charge that is in the nucleus of an atom?

neutron

proton

electron

valence electron

How is the number of neutrons in the nucleus of an atom calculated?

Add the number of e- and p+ together

Subtract the number of e- from p+

Subtract the number of p+ from the mass number

Add the mass number to the number of e-

What is the mass number of this atom?

What is the number of protons in the nucleus of an atom that determines the chemical properties of an atom?

mass number

atomic mass

atomic number

atomic symbol

What is the atomic number of this atom?

10.

What does the C represent?

atomic mass

atomic number

element name

chemical symbol

11.

What does the 6 represent?

Atomic mass

atomic number

chemical symbol

element name

12.

Using your periodic Table, calculate the formula mass of N₂.

Answer:

(a)

13.

Using your periodic Table, calculate the formula mass of CaCO₃.

Answer:

(a)

14.

Using your periodic Table, calculate the formula mass of Mg(OH)₂.

Answer:

(a)

15.

What elements are in this compound?

Iron

Sulfur

Oxygen

all of the above

16.

How many atoms of Iron are in this formula

17.

What is the total atomic mass of Fe in this compound

55.845

111.69

32.067

15.999

18.

How many elements are in C₆H₁₂O₆?

19.

What is the smallest unit of matter? It is composed of protons and neutrons, held together in the nucleus, and electrons around the nucleus in different electron orbitals, which form an electron cloud.

cell

nucleus

atom

electron

20.

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

Mg and O

MgO

Mg and MgO

O and MgO

21.

Balance this equation...
H₂ + Cl₂ --> HCl

It is balanced

3H₂ + Cl_{2 -->}6H₂Cl

H₂ + Cl₂_{--> 2HCl}

I don't know! Oh well.

22.

Which of the following is an unbalanced equation?

CaCO₃--> CaO + CO₂

PbO₂+ 2H₂-->2Pb + H₂O

2Na+ 2H₂O-->2NaOH + H₂

CS₂+ 2O₂--> CO₂+ 2SO₂

23.

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

4Fe + 3O₂ -> 2Fe₂O₃

2 Fe + 3O₂ -> Fe₂O₆

4 Fe + O₆ -> 2Fe₂O₃

None of the options are correctly balanced.

24.

What is the law of conservation of mass?

Mass of products is more than mass of reactants

Mass of reactants is less than mass of products

Mass of reactants is equal to mass of products

25.

A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red. What is the mass of products?

Mass is less than 13 grams

Mass is equal to 13 grams

Mass is greater than 13 grams

Mass cannot be measured

26.

Predict what would happen to the mass of this chemical reaction

Cu _(s)+ O_2(g)--> CuO _{( s)}

increase

decrease

stays the same

27.

Predict what would happen to the mass of this chemical reaction

HCl _(aq)+ CuCO_3(s)--> CuCl_{2( aq) +}CO_2(g)+ H₂O _(l)

increase

decrease

stays the same

Reset

Mass calculations

Total questions: 27

Worksheet time: 20mins

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