! Law of conservation of mass

Match the following

• CH4

• Reactant

  Compound

• 2C2

• Reactant

  Element

• CO2

• Product

  Compound

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

NGSS.MS-PS1-2

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

How many elements does PbNO₃ have?

• 2
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

How many nitrogen atoms does NH₃ have?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

A chemical equation tells us 

• the reactants and the products.
• the elements that make up the reactants and the products.
• the number of atoms that make up the reactants and the products.
• All of the above.

Tags

NGSS.MS-PS1-5

What is the reactant in the following equation?
2NaHCO₃  -> Na₂CO₃  +  CO₂  + H₂O

• NaHCO₃
• Na₂CO₃
• CO₂
• H₂O

Tags

NGSS.MS-PS1-2

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

For the equation:
2H₂ +  O₂ --> 2H₂O
How much H₂O will be produced if we react 4g of H₂ and 32g of O₂?

• 4g
• 32g
• 36g
• 28g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which  of the following is a balanced equation?

• Na   +   Cl₂   -->  NaCl
• H₂  +  O₂  --> H₂O
• Ca   +   Br  -->  CaBr₂
• Na   +  F  -->  NaF

Tags

NGSS.MS-PS1-5

The number to the lower side of an element is a  (H₂O)

• Subscript
• Superscript
• Coefficient
• Charge

Tags

NGSS.MS-PS1-1