Law of Conservation

Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

• 50 g

• 100 g

• 200 g

• 400 g

Which of the following describes the law of conservation of mass?

• In a reaction, atoms are created or destroyed.

• In a reaction, atoms are not lost or made.

• In a reaction, the mass of the product may be more or less than the reactants.

• In a reaction, mass never stays the same.

Tags

NGSS.MS-PS1-5

P4O10 had a mass of ​12g , and H3PO4 has a mass of 90g, accroding t the law of conservation of mass what is H2O mass? ​ ​ (a)  

• 78g

• 102

• 102g

• 90g

• 12g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

• The wood disappears.

• It stays the same chemically.

• The atoms in the wood and oxygen rearrange and form smoke and ash.

• Nothing.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products

• a total of 75g of products

• a total of 180 g of products

• None of the above

Tags

NGSS.MS-PS1-5

In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?

• 17g

• 2g

• 7g

• None of the above

Tags

NGSS.MS-PS1-5

Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:

• Producers

• Products

• Reactionaries

• Reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

4 grams of hydrogen and 32 grams of oxygen will combine to form:

• 36 grams of water

• 28 grams of hydroxide

• 32 grams of oxygen

• 36 grams of deuterium

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Which of the following best describes the Law of Conservation of Energy?

• Energy can be created or destroyed.

• Energy can be transformed from one form to another, but the total energy remains constant.

• Energy is always lost as heat.

• Energy can only be stored in chemical bonds.

Tags

NGSS.MS-PS3-5

In a closed system, if the total energy before a reaction is 100 J, what will be the total energy after the reaction according to the Law of Conservation of Energy?

• 50 J

• 100 J

• 150 J

• 0 J

Tags

NGSS.MS-PS3-5