semester final f24

Balance this equation.

__CF₄ + __Br₂ --> __CBr₄ + __F₂

• 2,1,2,1

• 1,2,2,1

• 1,2,1,2

• 2,2,2,2

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• Yes
• No

Tags

NGSS.HS-PS1-7

The ____ are new substances that are created following or after a chemical reaction.

• Reactants

• Monoliths

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The large number before a molecule is called a _______________.

• Subscript

• Capital Number

• Coefficient

Tags

NGSS.MS-PS1-5

The subscript represents the number of ____________ in a chemical equation.

• Molecules

• Numbers

• Atoms

• Coefficients

Classify the following chemical reaction.

Si_(s) + 2Cl_2(g) --> SiCl_4(l)

• Composition/Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

Why must chemical equations be balanced?

• So that the equation doesn't explode

• The reaction won't happen until it is balanced

• Based on the Law of Conservation of Matter, matter cannot be created or destroyed.

• Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e

Tags

NGSS.HS-PS1-7

What does the symbol (aq) stand for?

• Aquatic

• Aqueous

• Aqua

• Aquarium