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Evidence of a Reaction
Part of a Chemical Reaction
Types of reactions
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100

True or false: Chemistry is the study of matter and how matter changes with reactions.

True

100

Parts on the right side of a chemical equation is called?

Product

100

Balance and classify: NaOH(s)→Na2O(s)+H2O(g)

2NaOH(s)→Na2O(s)+H2O(g)
Decomposition

100

NaCN(aq)+HBr(aq)→NaMg(aq)+HCN(g)

NaCN(aq)+HBr(aq)→Na(Mg) it should Br(aq)+HCN(g)

200

Mention 3 evidences that indicate a chemical reaction takes place.

Gas, color, change in properties (substrate) and overall production of one or more new substances, precipitate?

200

Parts on the left side of a chemical equation is called?

Reactant

200

The type of reaction where one element or two replace each other or 2 elements trade places.

Replacement reaction

200
The minimal amount of energy needed to start a reaction.
What is activation energy?
300
This solid forms from a solution during a chemical reaction.
What is a precipitate?
300

Balance: Mg + O2 ----> MgO

2Mg + O2 ----> 2MgO

300
The type of reaction where more complex compounds are formed from simple ones.
What is a synthesis reaction?
300
True/False: The rate of a chemical reaction is independent of temperature.
What is false? Temp can change everything including the rate of the reaction.
400
True or false: a chemical reaction may be detected by observing changes in the properties of matter.
What is true?
400

chemical reactions in which the reactants absorb heat energy from the surroundings to form products is _____

Endothermic Reaction

400

Balance and Classify: Fe(s)+O2(g)→Fe2O3(s)

4Fe(s)+3O2(g)→2Fe2O3(s), Synthesis or combination

400

 Balance: Na2S(aq)+HCl(aq)→NaCl(aq)+H2S(g)

Na2S(aq)+2HCl(aq)→2NaCl(aq)+H2S(g)

500

There is a lit candle, the wax has melted down the side and hardened on your table. The type of change that the wax has gone through chemical or physical change. Which one? 

Physical change.

500

True or false.. The amount of matter in a chemical reaction changes...

False

500

Balance and Classify: HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)

Already balance & Double replacement.

500

The best evidence of Chemical reaction is?

The formation of a new substance.