Monache Stoichiometry Test Review

Balance this reaction: ____ HCN + ____ CuSO₄ ---->____ H₂SO₄ + ____ Cu(CN)₂

• 2,1,1,2
• 2,1,1,1
• 1,2,2,1
• 1,2,1,1

Tags

NGSS.HS-PS1-1

If the equation is balanced, what will the coefficient on Oxygen gas?
Al + O₂ → Al₂O₃

• 2
• 3
• 1
• 4

Which satement is true?

• When balancing a reaction, change the subscripts as needed. 
• Chemical reactions do not follow the law of conservation of matter.
• Products are written to the left of the arrow. 
• The coefficient represents the number of molecules present.

Tags

NGSS.HS-PS1-7

In the following chemical reaction, how many hydroxide (OH) molecules are represented?
CoBr₃+3CsOH-->  Co(OH)₃+3CsBr

• 3
• 6
• 1
• 2

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

When converting from the mass of a product to the mass of a reactant, the mass of the product is first converted to 

• the mass of the reactant
• moles of the reactant
• moles of the product
• mass of the product

If 4.0 moles of  AgNO₃ are used up, how many moles of Pb(NO₃)₂ are produced?
PbCl₂ + 2AgNO₃ → Pb(NO₃)₂ + 2AgCl

• 8.0 moles
• 2.0 moles
• 1.0 moles
• 4.0 moles

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g
• 2.6 g
• 690 g
• 45 g

Tags

NGSS.HS-PS1-7

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

What is the molar mass of CH₄?

• 16.05
• 16.04
• 16.03
• 16.02