Law of Conservation of Mass/Evidence of a Chemical Reaction

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

Number of H in 3(NH₄)₂CrO₄

• 4
• 2
• 8
• 24

How many atoms are there TOTAL in:
H₂SO₄

• 6
• 5
• 7
• 3

Tags

NGSS.MS-PS1-1

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

The blue numbers in the image below represent ________

• I don't know, and don't want to try
• coefficients
• subscripts
• none of the answers are correct

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

Tags

NGSS.MS-PS1-1

According to the law of conservation of mass, if 5 grams of Oxygen completely reacted with 10 grams of Hydrogen, how many grams of water should be produced?

• 5g
• 10g
• 15g
• 20g

Tags

NGSS.MS-PS1-5

Which equation is balanced?

• SO₂ + 2H₂--> H₂SO₄
• SO₂ + H₂O --> H₂SO₄
• 2Na + 2H₂O --> 2NaOH + H₂
• 2Na + 2H₂O --> 2NaOH + H

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5