Week 1 Quiz: Chemistry

− 7 + 20 = and (-7)(20)=

13 and -140

If 32 people out of 50 are over 6.00 feet tall, the % of people over 6.00 feet tall is....

64%

A scientific "theory" is....(Choose the 2 best answers)

a well-tested hypothesis; an explanation

A controlled test designed to determine if a hypothesis is true or false is called.....

an experiment

A student believes that a unlabeled clear liquid is methanol based upon its smell. To confirm her belief, she measures the mass and volume of the liquid and calculates its density. Identify the experiment.

finding the density

A drawing (line) that represents the relationship between 2 variables (the dependent variable and the independent variable) is called a .....

graph

The scientific method approach to problem solving (Choose all that apply)

is cyclic in nature ; allows revision of hypotheses when needed as new data is obtained

If a line shows a decrease in "y" while there is an increase in "x"......the slope would be...

negative

A student believes that a unlabeled clear liquid is methanol based upon its smell. To confirm her belief, she measures the mass and volume of the liquid and calculates its density. Identify the hypothesis.

postulating that the liquid is methanol

A student believes that a unlabeled clear liquid is methanol based upon its smell. To confirm her belief, she measures the mass and volume of the liquid and calculates its density. Identify the data.

the smell of the liquid ; measuring the volume of the sample