Q3- CompSci2 Study Guide

Label the following element from the periodic table:

a

b

c

d

Element Name

Atomic Number

Chemical Symbol

Atomic Mass

The number of protons is ​ (a)   the ​ (b)   .

• equal to
• atomic number
• less than
• greater than
• chemical symbol
• atomic mass

How many protons does nickel have?

Mathematical Equivalence

ON

How many electrons does nickel have?

Mathematical Equivalence

ON

How many neutrons does beryllium have?

Mathematical Equivalence

ON

Which of the above figures best represents the depiction of an element?

• figure W

• figure X

• figure Y

• figure Z

Which of the figures above best represents the depiction of a compound?

• figure W

• figure X

• figure Y

• figure Z

When magnesium (Mg) metal is burned in the presence of oxygen gas (O₂), magnesium oxide (MgO) is produced. The properties of magnesium oxide are different from the individual properties of magnesium and oxygen because magnesium oxide is

• a solution

• a mixture

• a compound

• an element

All of the following are pure substances except…

• water (H₂O)

• air

• table salt (NaCl)

• table sugar (C₆H₁₂O₆)

What is another name for a solution?

• homogeneous mixture

• heterogeneous mixture

• substance

• compound