T 1, 2, 3 (intro, matter, measurements, sig figs, DA)

Question 1

reported-celery became crisp

Answer 1

observation

Question 2

then suggested…=

Answer 2

hypothesis

Question 3

sequence followed in the lab

Answer 3

define a problem
form a hypthesis
gather experimental data
conclusion

Question 4

meniscus

Answer 4

bottom of the circle thingy

Question 5

heating 20-30 and temp recorded every 2 min best graph

Answer 5

|time|temp
0. ___
2
4
etc

Question 6

investigate how reaction rate changes with change of concentration of HCL- Independent variable

Answer 6

HCl concentration

Question 7

interpret graph

Answer 7

the greater the the number of x___, the less y____

Question 8

H\/2 represent a

Answer 8

molecule

Question 9

Which statement describes a characteristic of all
compounds?

Answer 9

Compounds can be decomposed by chemical
means

Question 10

Which terms are used to identify pure substances?

Answer 10

an element and a compound

Question 11

In physical change does the chemical composition change?

Answer 11

NO

Question 12

compounds are chemically combined in a _ proprtion

Answer 12

fixed

Question 13

Using the rules for significant figures, the sum of
0.027 gram and 0.0023 gram should be expressed
as

Answer 13

0.029 gram (.027 is smallest decimal)

Question 14

difference 28.02- 28.086 sig figs

Answer 14

0.07

Question 15

Given: (52.6 cm)(1.214 cm). What is the product
expressed to the correct number of significant
figures?

Answer 15

63.9 cm2

Question 16

What is the quotient of 8.01 grams divided by
3.127 grams, expressed to the correct number of
significant figures?

Answer 16

2.56

Question 17

metric conversion saying

Answer 17

Ken’s Hairy Dog Usually Doesn’t Chase Mice
Kilo Hecto Deka Unit Deci Centi Milli

Question 18

in a calculation, you must SHOW

Answer 18

cancel units