Exam

Question 1

What is matter

Answer 1

Anything that has mass or takes up space

Question 2

What is a substance

Answer 2

Kind of matter with uniform properties

Question 3

What is the particle theory of matter

Answer 3

1. All matter is made up of extremely tiny particles
2. Each pure substances has its own kind of particle different from the particles or other pure substances
3. Particles attract each other
4. Particles are always moving
5. When particles get heated up they move faster

Question 4

What is stability

Answer 4

The ability of a substance to remain uncharged

Question 5

What is combustibility

Answer 5

The ability or a substance to burn in air

Question 6

What is toxicity

Answer 6

The ability or a substance to cause harmful effects to plants and animals

Question 7

What is physical and chemical change

Answer 7

Physical change: Change in a substance that does not make a new substance

Chemical change: One it more new substances are produced it can’t get back original form

Question 8

What makes up an atom

Answer 8

Protons neutrons and electrons

Question 9

How did Bohr contribute to the atomic theory

Answer 9

He did the Gold foil experiment

Question 10

What is standard atomic notation

Answer 10

The chemical symbol with mass number and atomic number beside it
( atomic number = protons)

Question 11

What is the Atomic number and mass numbers

Answer 11

Atomic number Number of protons on the bottom and mass number is protons plus neutrons on top

Question 12

Who invented the modern periodic table

Answer 12

Mendeleev

Question 13

What are the trends in the periodic table

Answer 13

Group atomic radius: down a column atomic radius increases
Periodic atomic radius trend: across a period L to R atomic radius decreases
Group trend ionization energy: Down a column energy increases
Periodic trend ionization energy: Across a period L to R energy increases
Group electronegativity trend: Down column decreases
Periodic electronegativity trend: Across L to R increases

Question 14

What’s a conductor and insulator

Answer 14

Conductor conducts energy well

Insulators don’t easily allow heat, energy, light or sound to pass through it

Question 15

Molecules and atoms

Answer 15

Molecules is a group of atoms bonded together

Atoms are a basic unit of chemical elements

Question 16

What are biotic and abiotic factors

Answer 16

Abiotic factors can determine which species will survive in the given environment like soil, temperature ( things that are not alive )

Biotic factors include predation, disease, competition, parasites, consumptions and symbioses. ( things that are alive )

Question 17

Food chains and energy transferred

Answer 17

10% of energy is transferred through food chains

Question 18

What is photosynthesis, products , reactants and why is complementary to cellular respiration

Answer 18

Photosynthesis: plants and organisms use sunlight to make foods from carbon dioxide and water
Products: React carbon dioxide with water to make a sugar called glucose
Reactants: a substance that takes part in and undergoes change during a reaction
Photosynthesis is completely to cellular respiration because they both consume and create the same substances ( water glucose oxygen and carbon dioxide)

Question 19

What are producers, primary consumers, secondary consumers, tertiary and top consumers

Answer 19

Producers create food so primary eats it then secondary eats primary then tertiary eats that and then top consumer

Question 20

What is algae bloom and nitrogen cycle

Answer 20

Algae bloom: Increases in algae

Nitrogen cycles: Nitrogen is converted into multiple chemical forms, it circulates among the atmosphere