Select ALL that are correct:

The Law of Conservation of Mass states...

• matter cannot be created or destroyed

• matter can be created or destroyed

• matter cannot be transferred / la materia no puede ser transferida

• matter can be transferred

Tags

NGSS.MS-PS1-5

What is the little number after an element in a chemical equation called (highlighted in green)?

¿Cómo se llama el pequeño número que aparece después de un elemento en una ecuación química (subrayado en verde)?

2H₂ + O₂ --> 2H₂O

• Coefficient

• Subscript / subíndice

• Atom

• Molecule

Balance this equation:  H₂ + N₂ → NH₃

•  H₂ + 4N₂ → NH₃

•  H₂ + 3N₂ → 2NH₃

•  3H₂ + N₂ → 2NH₃

•  2H₂ + 2N₂ → 2NH₃

Tags

NGSS.MS-PS1-5

Which option is correctly balanced?

• Fe + H₂O --> Fe₃O₄ + H₂

• 3 Fe + H₂O --> Fe₃O₄ + H₂

• 3 Fe + 4 H₂O --> Fe₃O₄ + 4 H₂

• 3 Fe + 2 H₂O --> Fe₃O₄ + H₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• 4

• 12

• 9

• 24

Tags

NGSS.MS-PS1-1

In chemical reactions, a product is _________.

• any substance that is made of the greatest number of atoms

• any substance that is made from the least number of atoms

• any substance to the right of the arrow

• any substance that is to the left of the arrow

_NaF + _Br₂ →_NaBr + _F₂

• NaF + 2 Br₂ →NaBr + 2 F₂

• 2NaF + 2 Br₂ → 2 NaBr + 2 F₂
• 2 NaF + 3 Br₂ → NaBr + 2 F₂

• 2 NaF + Br₂ → 2 NaBr + F₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

(NH₄)₂Cr₂O₇ How many H are in this atom?

• 2

• 4

• 6

• 8

Tags

NGSS.MS-PS1-1

Is the following equation balanced?

Al + O₂ --> 2Al₂O₃

• Yes

• No

Tags

NGSS.MS-PS1-5

The blue numbers in the image below represent ________

• I don't know, and don't want to try
• coefficients
• subscripts
• none of the answers are correct

Tags

NGSS.HS-PS1-7