Conservation of Matter

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

• 15 grams

• 25 grams

• 20 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If reaction starts with 20g of reactants, it will produce ---

• a total of 40g of product

• a total of 10g of product

• a total of 80 g of product

• a total of 20g of product

Tags

NGSS.MS-PS1-5

How many of each type of atom are in the formula NH₃?

• 1 nitrogen, 3 hydrogen

• 3 nitrogen, 3 hydrogen

• 1 neon, 3 hydrogen

• 1 nitrogen, 3 helium

Tags

NGSS.MS-PS1-1

How many molecules are represented in the formula 3CO₂?

• 3 carbon, 2 oxygen

• 6 carbon dioxide

• 3 carbon dioxide

• 3 carbon, 6 oxygen

Tags

NGSS.MS-PS1-1

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-PS1-2

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?

• They both will have the same mass

• The product always has more mass than the reactant

• The reactant will have more mass than the product

• They both will lose mass after the reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 

• 2
• 4
• 6
• You need more information to answer this question

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• Yes
• No

Tags

NGSS.MS-PS1-5

Balance this equation:

MgCl₂ --> Mg₄ + Cl₂

• It's already balanced.

• 4 MgCl₂ --> Mg₄ + 4 Cl₂

• 4 MgCl₂ --> Mg₄ + 5 Cl₂

Tags

NGSS.MS-PS1-5

Balance this equation:

2 Li + Cl₂ --> LiCl

• 2 Li + Cl₂ --> 4 LiCl₂

• 2 Li + Cl₂ --> 2 LiCl

Tags

NGSS.MS-PS1-5