Option C Chemistry

• 4 molecules of CH

• 4 atoms of carbon in a methane molecule

• 4 atoms of hydrogen in a methane molecule

• 4 atoms of methane

Tags

NGSS.MS-PS1-1

Identify one advantage of symbol equations compared to word equations. Symbol equations:

• are difficult to understand, so keep chemical knowledge restricted to scientists

• show exactly which elements are involved and the relative number of atoms of each

• use plain English

• show both the reactants and products

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

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

Tags

NGSS.MS-PS1-5

Describe what chemical reactions are. Imagine you're explaining it to someone who is learning about them for the first time.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When you heat calcium carbonate – a white solid with the formula CaCO3 – it breaks down to form solid calcium oxide (CaO) and carbon dioxide gas (CO2). Write a word equation (use the word "produces" instead of an arrow)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Tags

NGSS.MS-PS1-5

• Carbon

• Hydrogen

• Oxygen

Tags

NGSS.MS-PS1-5

What's the difference between a physical property and a chemical one?

• Physical properties include flammability and reactivity. Chemical properties include color and length.

• Chemical properties include boiling and melting points. Physical properties include color and length.

• Physical properties do not change the ID of the substance, like melting or boiling point. Chemical properties do change the ID of the substance, like flammability or reactivity.

• Chemical properties do not change the ID of the substance, like melting or boiling point. Physical properties do change the ID of the substance, like flammability or reactivity.

Tags

NGSS.MS-PS1-2