Hydrates and MM identity

Name the following ionic compound: MgSO₄*7H₂O

• magnesium sulfate * hexahydarte
• magnesium sulfate hexahydarte
• magnesium sulfate heptahydrate
• magnesium sulfate* heptahydrate

Name the following hydrate:  NaCl * 5H₂O

• sodium chloride 
• sodium monochloride pentahydrate
• sodium chloride pentahydrate
• pentahydrate

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?

• MgCO₃ · 5H₂O
• MgCO₃ · 4H₂O
• MgCO₃ · 6H₂O
• MgCO₃ · 1H₂O

Tags

NGSS.HS-PS1-7

A hydrate of magnesium chloride is present and the following data is collected:
mass of crucible = 22.130 grams
mass of crucible + hydrate = 25.290 grams
mass of crucible and contents after heating = 23.491 grams
What is the complete formula of this hydrate?

• MgCl₂ · 7H₂O
• MgCl₂ · 11H₂O
• MgCl₂ · 6H₂O
• MgCl₂ · 13H₂O

Tags

NGSS.HS-PS1-7

What is the basic ratio that gives the lowest whole number ratio of the atoms of the elements in a compound called?

• Empirical formula

• Molecular formula

• Mole ratio

• Hydrate formula

A compound is a hydrate when it...

• is composed of only hydrogen and oxygen
• is a state of water
• traps water inside of the compound
• repels water from the compound

What is the correct chemical formula for barium hydroxide octahydrate?

• Ba(OH)₂ . 8H₂O

• Ba(OH)₂ . H₂O

• 8Ba(OH)₂ . H₂O

• Ba . 8(OH)₂

In the performance of the copper II sulfate hydrate lab a visual indicator that water was still present was

• the substance was blue

• the substance turned white

• the substance fizzed

• the substance changed temperature

Tags

NGSS.HS-PS1-2

1.  2.00 moles of a compound has a mass of 190.4 grams.

Is the compound MgCl₂ (95.2g/mol ) or AlCl₃ (133.4g/mol )?

• MgCl₂

• AlCl₃

1. A sample of a compound has a mass of 65.00 grams when 0.457 moles are present. Is the compound lithium sulfate( Li₂SO₄) 109.9g/mol or sodium sulfate (Na₂SO₄)   142.1g/mol?

• 1. Li₂SO₄

• 1. Na₂SO₄