Isotopes & Conservation of Matter

The law of conservation states that matter cannot be _______ or ________ in any chemical or physical change.

Tags

NGSS.MS-PS1-5

If 25 grams of sugar dissolves into 150 grams of water, what is the new weight of the liquid?

• 125g

• 25g

• 150g

• 175g

An Oreo cookie has a mass of 20 grams. It gets crushed into crumbs for a recipe. What is the mass of the crumbs?

• 15g

• 25g

• 20g

• 10g

Tags

NGSS.MS-PS1-5

If a chemical reaction starts with 38g, it will produce:

• a total of 38g of product

• a total of 19g of product

• a total of 40g of product

• a total of 76g of product

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

In a reaction A + B ----> C.

Reactant A has 5g and product C has 9g.

How many grams does reactant B should have?

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-5

What will have more mass when a chemical change is complete: the reactants before the chemical reaction or the product after the reaction is complete?

• The reactant will have more mass than the product.

• The product will have more mass than the reactant.

• They both will have the same mass.

• They both will lost mass after the reaction.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

If a carbon atom has 6 protons, how many neutrons are there in the isotope C-14?

• 6

• 14

• 7

• 8

In a regular carbon atom with an atomic number of 6, how many protons, neutrons and electrons will it have?

• 6 protons, 6 neutrons, and 6 electrons

• 5 protons, 6 neutrons and 6 electrons

• 6 protons, 7 neutrons and 6 electrons

• 5 protons, 5 neutrons and 5 electrons

Tags

NGSS.MS-PS1-1

Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons.

• True

• False

What is an isotope?

Tags

NGSS.HS-PS1-8