Chemical Reaction & Formula Re-Test

CH₂Cu₈ - How many Copper atoms are in this formula?

• 1

• 2

• 8

• 16

Tags

NGSS.MS-PS1-1

How many total atoms are in this formula? 3Zn₂O₃H

• 6

• 9

• 18

Tags

NGSS.MS-PS1-1

What is the subscript in this formula? 3N₂ONe

• 3

• 2

• 1

• 5

Tags

NGSS.MS-PS1-1

What is the coefficient for this formula? 9NaCl₂

• 9

• 2

• 1

• 11

Tags

NGSS.MS-PS1-1

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, changed
• None of the above

Tags

NGSS.MS-PS1-5

A chemical reaction is balanced when

• both sides have the same elements
• Both sides have the same  number of atoms
• Same subscripts
• Same coefficients

Tags

NGSS.MS-PS1-5

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

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

• yes

• no

Tags

NGSS.MS-PS1-5

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Tags

NGSS.MS-PS1-5

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2