Conservation of Mass Counting Atoms

How many Hydrogen atoms are there in 3H₂O?

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

In CO₂, how many Carbon's are there?

• 1

• 2

• 3

• infinite solution

Tags

NGSS.MS-PS1-1

In H₂O + CO₂ + O₂, how many O's are there?

• 1

• 2

• 3

• 5

Tags

NGSS.MS-PS1-1

Does this equation follow the law of conservation of mass?

• Yes

• No

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the law of conservation of mass, which statement is true?

• The atoms of the reactants and products are different

• The atoms of the reactants and products are equal

• The subscripts must be the same

• The compounds must be the same

Tags

NGSS.MS-PS1-5

Salt is combined with water to make salt water. What are the reactants?

• Salt

• Water

• Salt and water

• Salt water

Salt is combined with water to make salt water. What are the products?

• Salt

• Water

• Salt and water

• Salt water

After the reaction, how many grams will Time 2 Setup equal?

• 30 g

• 275 g

• 300 g

• 305 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If there is 200 g of reactants, how many grams of products should there be?

• Less than 200 g

• Equal to 200 g

• More than 200 g

Tags

NGSS.MS-PS1-5

Does this follow the law of conservation of mass?

• Yes, because there are the same number of atoms.

• Yes, because there are not the same number of atoms.

• No, because there are the same number of atoms.

• No, because there are not the same number of atoms.

Tags

NGSS.MS-PS1-5