Chemistry Equations

Hydrogen chloride (HCl) can be formed by the following reaction: hydrogen + chlorine → hydrogen chloride Identify the symbol equation for this reaction.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Select the option that best completes the following sentence. The law of conservation of matter states that during any chemical reaction:

• a small amount of matter is converted into energy

• the number of atoms of each element remains the same

• the total number of atoms remains the same but some atoms may switch from one element to another

• the total number of molecules remains the same

Tags

NGSS.MS-PS1-5

Identify which of the chemicals in the word equation below are compounds. potassium + water → potassium hydroxide + hydrogen

• Potassium hydroxide

• Water

• Potassium

• Hydrogen

Tags

NGSS.MS-PS1-1

Jeremy writes the following symbol equation for the reaction in the previous question: K(s)+H_2O(l)→KOH(aq)+H_2(g) Determine why this equation is unbalanced.

• There are 2 hydrogens on the reactant side and 1 oxygen on the product side

• There is K on the reactant side and KOH on the product side

• There are 2 hydrogens on the reactant side and 3 hydrogens on the product side

• There are 2 hydrogens on the reactant side and only 1 hydrogen on the product side

Tags

NGSS.MS-PS1-5

Sodium metal reacts explosively with water to produce sodium hydroxide and hydrogen gas. Determine which of the following chemical equations is balanced.

Tags

NGSS.MS-PS1-5

• replace Na on the reactant side with Na

• delete the 2 in front of the NaCl

• replace Cl with Cl

• add a 2 in front of the Na on the reactant side

Tags

NGSS.MS-PS1-5

Write the balanced symbol equation for this reaction including state symbols (s for solid, l for liquid, g for gas, aq for aqueous solution)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• 4 molecules of CH

• 4 atoms of carbon in a methane molecule

• 4 atoms of hydrogen in a methane molecule

• 4 atoms of methane

Balance this equation:
 2Li + Cl₂ -> LiCl

• 2Li + Cl₂ -> 4LiCl2

• 2Li + Cl₂ -> LiCl₂

• 2Li + Cl₂ -> 2LiCl

Tags

NGSS.MS-PS1-5

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

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5