Science 10 Chemistry Unit Exam

When metal atoms form ions, they tend to

• gain electrons and form positive ions

• lose electrons and form positive ions

• gain electrons and form negative ions

• lose electrons and form negative ions

What does this diagram represent?

• a nickel ion

• a silicon atom

• a nickel atom

• A. an oxygen ion

Which number represents an element in the halogen family?

• 1

• 2

• 3

• 4

• 5

Which number represents an element that can be classified as a metalloid?

• 1

• 2

• 3

• 4

• 5

An experiment shows that an unknown element does not easily lose or gain electrons. Which unknown represents this element?

• 1

• 2

• 3

• 4

• 5

Which number corresponds to a metal that belongs to the most reactive group of metals on the periodic table?

• 1

• 2

• 3

• 4

• 5

Potassium hydroxide and barium chloride react to produce barium hydroxide and potassium chloride. The balanced equation for this reaction is

• KOH + BaCl₂ ——> BaOH + KCl

• K(OH)₂ + 2 BaCl ——> 2 BaOH + KCl₂

• KOH + BaCl ——> BaOH₂ + KCl

• 2 KOH + BaCl₂ ——> Ba(OH)₂ + 2 KCl

How many occupied energy levels are there in a calcium atom?

• 1

• 2

• 3

• 4

An atom has an atomic number of 19 and a mass number of 29. How many neutrons are in the atom?

• 30
• 19
• 10
• 38

Tags

NGSS.MS-PS1-1

An atom has 5 protons and 7 neutrons. What is the mass number of the atom?

• 5
• 7
• 2
• 12

Tags

NGSS.MS-PS1-1