Click all of the following that is an example of a chemical sign.

• Color Change

• Corrosion

• Change in Temperature

• Precipitate

• Dissolving

N_2, Cl_{2, and} O₂ are all 

• diatomic molecules.
• ionic bonds.
• of equal mass.
• solids.

Tags

NGSS.MS-PS1-1

What are the seven diatomic elements?

• H_2, Cl₂, Br₂, O₂, N₂, I₂, F₂

• H₂, Cl₂, I₂, F₂, Hg₂, Br₂, Fe₂

• H_2, Cu₂, Ni₂, B₂, O₂, I₂, Fe₂

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

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction is the equation C + O₂ → CO₂?

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

Tags

NGSS.MS-PS1-2

What type of reaction is the equation 2NaCl →2Na +Cl₂?

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

Tags

NGSS.MS-PS1-2

Cu + 2Ag(NO₃) → 2Ag + Cu(NO₃)

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

Tags

NGSS.MS-PS1-2

Ca₃(PO₄)2 + 3 H₂SO₄ --> 3 CaSO₄ + 2 H₃(PO₄)

• Synthesis Reaction

• Decomposition Reaction

• Single Displacement Reaction

• Double Displacement Reaction

CxHy +O₂ --> H₂O + CO₂

• Decomposition
• Double replacement
• Combustion
• Single Replacement

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5