Science Quiz #1

Question 1

what are the 2 types of observations

Answer 1

quantitative and qualitative

Question 2

define qualitative observations

Answer 2

• these are made using our senses
• they are descriptive but not very accurate

Question 3

define quantitative observations

Answer 3

• these require a measuring tool or counting
• accurate, they do not depend on the person doing it observation

Question 4

what are physical properties + give examples

Answer 4

• describe the observable properties of a substance
• do not change the substance
• Examples: size (mass, volume, density) shape, state, color, smell, texture….

Question 5

define malleable

Answer 5

capable of being extended or shaped by beating with a hammer or by the pressure of rollers

Question 6

define ductile

Answer 6

able to hammered thin or stretched into wire without breaking

Question 7

define electrically conductive

Answer 7

the amount of electrical current a material can carry or it’s ability to carry a current

Question 8

define thermally conductive

Answer 8

a substance’s ability to transfer heat through a material by conduction

Question 9

define density

Answer 9

substance’s mass per unit of volume. (volume and mass)

Question 10

define melting point

Answer 10

point at which a substance will melt. ex. melting point of ice is 0 degrees.

Question 11

define viscosity

Answer 11

a measure of its resistance to deformation at a given rate

Question 12

define brittleness

Answer 12

a material that breaks or fractures easily without much deformation or stress (ex. glass, raw egg)

Question 12

define luster

Answer 12

describes how light is reflected on the surface of a mineral. ex. metals are shinny

Question 13

define insulating

Answer 13

to cover, line, or separate with a material that prevents or reduces the passage, transfer, or leakage of heat, electricity, or sound

Question 14

define opaque

Answer 14

not transparent

Question 15

define transparent and translucent

Answer 15

transparent - not see through (ex. window)
translucent - kind of see through but not fully (ex. frosted glass)

Question 16

here are some examples of physical properties!!

Answer 16

• Malleable
• Ductile
• Electrically Conductive
• Thermally Conductive
• Density
• Melting Point
• Viscosity
• Brittleness
• Luster
• Hard
• Insulating
• Magnetic
• Reflective
• Transparent
• Opaque
• Translucent
• Texture
• Powder
• Crystals
• Colour

Question 17

define chemical properties

Answer 17

• Chemical properties refer to how reactive a substance is
• How a substance reacts when mixed with another
• Observations of chemical properties are impossible without a chemical change.
• Deals with atomic or molecular structures of a substance

Question 18

define chemical properties these examples
(flammability, combustion, oxidation, reactivity)

Answer 18

flammability: how easily a vapor ignites
combustion: the product can burn
oxidation: reaction with oxygen to produce: -rust on iron or steel, grey tarnish on silver, or green stuff on old copper pennies
reactivity: how quick 2 substances react to create a new product.

Question 19

evidence of physical change

Answer 19

o Change of state
o Dissolving
o Cutting
o Breaking
o Ripping

Question 20

what is physical change

Answer 20

no new substance was made (ex. water into ice)

Question 21

what is chemical change

Answer 21

a new substance with new properties formed (ex. chemical change)

Question 22

evidence of chemical change

Answer 22

• Change in colour
• Gas forms (odour &/or bubbles)
• Change in temperature or light (change in energy)
• A precipitate (solid) forms from mixing of two
  liquids
• Change is irreversible