Simple Chemical Reactions

How do you test for Chlorine gas?

• Bleaches damp litmus paper

• Makes a squeaky pop with a lit splint

• Relights a glowing splint

• Turns limewater milky

The missing numbers in sequence in this reaction to balance the equation for burning hydrogen in air are:

___ H₂ (g) + _____O₂ (g) → _____ H₂O (g)

• 4 3 2

• 2 1 2

• 1 1 1

• 1 2 1

Tags

NGSS.MS-PS1-5

Balance this equation:
MgCl₂ --> Mg₄+ Cl₂

• It's already balanced.

• 4MgCl₂ --> Mg₄+ 4Cl₂

• 4MgCl₂ --> Mg₄+ 5Cl₂

Tags

NGSS.MS-PS1-5

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.
  

Tags

NGSS.MS-PS1-5

Is the following equation balanced or unbalanced ? 
Al + O₂ --> Al₂O₃

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5

Is the following equation balanced or unbalanced ? 
N₂ +3 H₂ --> 2NH₃

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2

• 6

• 1

• 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Label 1 shows the _____________ of the equation.

• products

• reactants

• coefficients

• subscripts

Label 3 is pointing at the ____________ part of the equation.

• product

• yields

• coefficient

• subscript

In this equation, what are the products?

• glucose molecule and 6 diatomic molecules of oxygen

• 6 molecules of carbon dioxide and 6 molecules of water

• 6 molecules of carbon dioxide and 1 molecule of water

• 6 molecules of oxygen and 6 molecules of carbon dioxide

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7