Chemical Reactions

Front

The number of atoms you begin with in a chemical reaction ...
Options: must be the same as the number of  atoms you end with, must be an even number, can be different to the number you finish with, changes depending on how much energy is formed

Back

must be the same as the number of  atoms you end with

Front

Which type of reaction is:

2 NH₃ + H₂SO₄ → (NH₄)₂SO₄

Options: Synthesis, Decomposition, Single Displacement, Double Displacement

Back

Synthesis

Front

Which type of reaction is: C₂H₄ + 3 O₂ → 2 CO₂ + 2 H₂O? Options: Synthesis, Decomposition, Single Displacement, Combustion

Back

Combustion

Front

Which type of reaction is:

2 K + MgBr₂ → 2 KBr + Mg

Options: Synthesis, Decomposition, Single Displacement, Double Displacement

Back

Single Displacement

Front

Provides evidence that a chemical reaction has occurred: dissolving, melting, formation of a gas, bending

Back

formation of a gas

Front

Which problem is balanced? Options: PbO₂ + 2H₂--> H₂SO₄, SO₂ + H₂0 --> H₂SO₄, 2Na + 2H₂O --> 2NaOH + H₂, 2Na + 2H₂O --> 2NaOH + H

Back

2Na + 2H₂O --> 2NaOH + H₂

Front

Balance this equation.
_CF₄ + _Br₂ -- _CBr₄ + _F₂

Back

1,2,1,2

Front

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have? Options: 4g, 5g, 9g, 14g

Back

4g

Front

In the reaction AB → A + B, reactant AB has 12g and product B has 5g. How many grams should product A have?

Back

7g

Front

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

Back

6 grams