Chemical reactions Flashcards Preview

S1 > Chemical reactions > Flashcards

Flashcards in Chemical reactions Deck (18)
Loading flashcards...
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

On which side of a chemical equation are reactants found?

The Left Hand Side (LHS)

6

On which side of a chemical equation are products found?

The Right Hand Side (RHS)

7

What does the "+" sign mean on the LHS of an equation?

Reacts with

8

What does the arrow mean in a chemical equation?

"To produce"

 

9

What does the + sign on the RHS of a word equation mean?

And

10

What is ALWAYS produced in a chemical reaction?

A new substance

11

What are the 5 signs of a chemical reaction?

  • Gas given off
  • Colour change
  • Smell
  • Energy change  (temperature, light)
  • Solid formed

12

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

13

What is meant by "collision theory"?

The idea that particles must collide in order to react

14

What is meant by temperature?

15

How does increasing temperature increase reaction rate?

The particles are moving faster and collide more often and with more energy.

16

How does increasing concentration increase reaction rate?

More particles in given area means that particles will collide more often.

17

How does decreasing particle size of a solid increase reaction rate?

Collision take place on the surface and the surface area is increased by decreasing particle size

18