law of constant ratios

How many F atoms are in this compound?
6MgF₂ 

• 2
• 6
• 8
• 12

Tags

NGSS.MS-PS1-1

There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

• 47g
• 13g
• 23g 
• You cant tell with the given information

Tags

NGSS.MS-PS1-5

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

The number of atoms on one side of a chemical equation is equal to

• a molecule of a substance
• the amount of gas released during a chemical reaction
• the number of atoms on the other side of a chemical equation
• all of the matter that exists in the universe

Tags

NGSS.MS-PS1-5

Based on this compound Al₂(SO₄)₃ what can you conclude the charge of sulfate is?

• +2

• -2

• +3

• -3

How many hydrogen atoms are in this chemical formula: 

• 4 hydrogen atoms
• 1 hydrogen atom
• 2 hydrogen atoms
• 3 hydrogen atoms

Tags

NGSS.MS-PS1-1

The new substances formed during chemical reactions are called

• products

• reactants

• substrates

• catalysts

if the molecule of carbon dioxide consists of one atom of carbon and two atoms of oxygen, knowing that the mass of carbon is 12 and the mass of oxygen is 16, so the mass of 2 molecules of carbon dioxide equals ............... gm.

• 22

• 88

• 44

• 33

What is this emotion?

• Cool

• Hot

• Cold

• Scared

What is this emotion?

• Sad

• Happy

• Sick

• Hurt