Science skills

Question 1

lab notebook

Answer 1

record of all lab pre-lab and lab work

Question 2

lab report

Answer 2

item developed after an experiment that is intended to present the results

Question 3

chromatography

Answer 3

set of lab techniques used to separate or analyze mixtures

Question 4

reagent or reactant

Answer 4

chemical used in chemical reactions

Question 5

when diluting acids…

Answer 5

always add the concentrated acid to water. 2/3rd water, acid, then the remainder of the water

Question 6

when cleaning up acid spills…

Answer 6

use sodium bicarbonate, baking soda, soda ash, or kitty litter, clean from outside in, sweep up clumps and dispose

Question 7

centrifuge

Answer 7

separates the components of a heterogeneous mixture by spinning it

Question 8

in a centrifuge…

Answer 8

the solid precipitate settles in the bottom and the liquid centrifugate is at the top

Question 9

scientific fact

Answer 9

an objective and verifiable obsevation

Question 10

scientific theory

Answer 10

greater body of accepted knowledge, principles, or relationships that might explain why something happens

Question 11

scientific law

Answer 11

explanation of events that always leads to the same outcome

Question 12

scientific method steps

Answer 12

identify problem or ask question, hypothesis, conduct experiment, observe, conclude

Question 13

the scientific method should lead to…

Answer 13

being peer reviewed so experiments can be reproduced to verify results

Question 14

the meter measures

Answer 14

length

Question 15

liter measures

Answer 15

volume

Question 16

gram measures

Answer 16

mass

Question 17

deka means

Answer 17

times 100 the base unit

Question 18

hecto

Answer 18

times 100 the base unit

Question 19

kilo

Answer 19

times 1000 base unit

Question 20

deci

Answer 20

1/10 of the base unit

Question 21

centi

Answer 21

1/100 the base unit

Question 22

milli

Answer 22

1/1000 the base unit

Question 23

ampere (A)

Answer 23

measures electric current

Question 24

kelvin (K)

Answer 24

measures thermodynamic temp

Question 25

candela (cd)

Answer 25

measures luminous intensity

Question 26

mole (mol)

Answer 26

measures amount of a substance at a molecular level

Question 27

an XY or scatter plot is used for

Answer 27

plotting many points

Question 28

bar charts and histograms

Answer 28

compare differences between the data collected for two variables

Question 29

pie charts are used for

Answer 29

seeing the relation of parts to a whole

Question 30

straight narrative for presenting data…

Answer 30

should not be used for numbers and quantitative measurements

Question 31

Tables are graphs

Answer 31

used to present numerical data

Question 32

random errors

Answer 32

not consistent across data sets; wildly different from the rest of the data, don’t affect average; called noise

Question 33

systematic errors

Answer 33

show up consistently, may be a result of flaws in experimental design. known as bias, affects average

Question 34

scientific notation

Answer 34

exponent is positive, move decimal to the right; exponent is negative, move decimal to the left

Question 35

mean

Answer 35

average

Question 36

median

Answer 36

middle number

Question 37

mode

Answer 37

the number that appears most frequently

Question 38

range

Answer 38

the difference between the highest and lowest numbers in a data set

Question 39

standard deviation

Answer 39

measures the dispersion of a data set or how far from the mean a single data point is likely to be