1.1 Reactions and Reaction Rates Flashcards Preview

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Flashcards in 1.1 Reactions and Reaction Rates Deck (15)
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1

What is an element?

A substance containing only 1 type of atom

2

What is a compound?

2 or more elements chemically combined

3

What is a reactant?

A substance that takes part in a chemical reaction

4

What is a product?

A substance produced in a chemical reaction

5

What is ALWAYS produced in a chemical reaction?

A new substance

6

What are the 5 signs of a chemical reaction?

Gas given off

Colour change

Smell

Energy change  (temperature, light)

Solid formed

7

How can we detect energy changes in a reaction?

Using a thermometer to detect change in temp

Feeling heat given off by a reaction

Hearing sound energy

Seeing Light energy

8

How do reactions occur?

Particles of reactants collide.

( collision theory)

9

Why do reactions stop?

Particles of one of the reactants "run out"

10

What is the "limiting reactant"?

The reactant whose particles are all used up first

11

What is the "excess reactant" ?

The reactant that still has particles present when the reaction stops.

12

What is qualitative data?

Data based on judgement using the senses

13

What is quantitative data?

Data based on measurements of quantity and / or time.

14

What is meant by "independant" variable?

The thing we choose to change in an investigation

15

What is meant by " dependant" variable

The thing in a reaction that we measure as a result of the reaction

 

  • volume of gas produced
  • mass of reactants produced