chemistry

Question 1

Expansion:

Answer 1

Expansion: it is when the particals heat up tso much that they vibrate fast and spred out eg tking more room

Question 2

) Physical Change:

b

Answer 2

) Physical Change: A change where no new substance is produced.

Question 3

Examples of Changes
Physical Changes:

Answer 3

Examples of Changes
Physical Changes:

Melting ice
Boiling water
Breaking glass
Dissolving sugar in water

Question 4

Chemical Changes:

Answer 4

Chemical Changes:

Rusting iron
Burning wood
Baking a cake
Digesting food

Question 5

: Indicators of Chemical Change

Answer 5

: Indicators of Chemical Change
Color change
Gas production (bubbles)
Temperature change (heat/light)
Formation of a precipitate (solid)

Question 6

Changes of State
Heating Solid to Gas:

Answer 6

Palm Card 5: Changes of State
Heating Solid to Gas:

Solid to Liquid: Melting
Liquid to Gas: Boiling/Evaporation

Question 7

Cooling Gas to Solid:

Answer 7

Cooling Gas to Solid:
depsostion

Question 8

Chemical Needed for Combustion:

Answer 8

Chemical Needed for Combustion: Oxygen

Question 9

Compressibility of Gases vs. Solids/Liquids:

Answer 9

Gases are compressible because particles are far apart and can be pushed closer together.

Solids and liquids are incompressible because particles are closely packed with little space to compress further.

Question 10

Physical Changes in Recycling Aluminum:

Answer 10

Melting, casting, and solidifying

Question 11

Candle Burning:

Answer 11

Physical Change: Melting of wax

Chemical Change: Burning of wax to produce light, heat, carbon dioxide, and water vapor

Question 12

Heating Solid to Liquid:

Answer 12

sublation Particles gain energy, vibrate more, and break free from fixed positions to move past each other.

Question 13

Heating Liquid to Gas:

Answer 13

evapartoion articles gain more energy, move faster, and spread out to form a gas.

Question 14

Dissolving Solute in Solvent:

Answer 14

Solute particles spread out and mix uniformly with solvent particles.

Question 15

Expansion:

Answer 15

When a substance is heated, the particles gain kinetic energy.
This increased energy causes the particles to vibrate or move more vigorously.
As the particles move more, they tend to push away from each other, causing the material to expand.

Question 16

Contraction:

Answer 16

When a substance is cooled, the particles lose kinetic energy.
This decreased energy causes the particles to vibrate or move less.
As the particles move less, they come closer together, causing the material to contract.

Question 17

Photosynthesis:

Answer 17

Converts CO₂ and H₂O into glucose and O₂ using sunlight.
Occurs in plants.

Question 18

Resportaion

Answer 18

Converts glucose and O₂ into CO₂ and H₂O releasing energy.
Occurs in living organisms.

Question 19

b) Solution:

Answer 19

b) Solution: A mixture where a solute is dissolved in a solvent.

Question 20

Combustion:

Answer 20

C where a substance burns in oxygen, producing heat and light.
​

Question 21

Chemical Reaction:

Answer 21

Process where substances combine or break apart to form new substances.
​
Word Equation: Description of a chemical reaction using words.

Question 22

Word Equation:

Answer 22

Description of a chemical reaction using words.

Question 23

c) Photosynthesis:

Answer 23

c) Photosynthesis: The chemical process involving chlorophyll that plants use to create food.

\

Question 24

d) Combustion:

Answer 24

) Combustion: Any reaction where a substance burns in oxygen.