Exam 1: Matter, measurements, and Calculations

You are saving for a new $1226 (including taxes)laptop computer using earnings from your part-time job.At that job,you work 20 hours/week,earning $10.25/hour take home pay.If you can save 25% of all of your income,how many weeks will it take for you to save enough money?

The figure shown below is an example of what type of molecule?

A patient weights 220 lbs.A medication for this patient is supposed to be taken 3 mg per kg per day.The correct dose for this patient is 3000 mg per day.

The fact that gold does not corrode is a ______ property

Which of the following consists of a single chemical species?

Table salt,NaCl is best classified as a(n)_____ .

A molecule represented by O-O-O must be classified as

Based on data obtained in an experiment,to determine the density of a metal,the following calculation is carried out.Express the answer to the correct number of significant figures.

The limit of physical subdivision of pure H₂O is _____ .

Body density can be used to determine the amount of fat carried by an individual because the density of muscle is greater than that of fat.

A scientific model is an explanation for observed behavior.

Homoatomic pure substances are known as _____ .

Eighteen students in a class will get this question correct.If that represents 45% of the class,how large is the class?

A patient with a body temperature of 300 K would be considered as suffering from hypothermia.

The fact that iron (Fe)corrodes when exposed to water and air is a

How many significant figures are justified in a measurement of a length that is between 9 and 10 centimeters if the measuring device (ruler)has smallest divisions of 0.1 cm?

The average gestation period (length of a pregnancy)for humans is 40 weeks.If a child if born after just 36 weeks,what was the percentage of this gestation period compared to the normal length?

If a 50 gram sample of iron alloy contains 40 grams if iron,it contains 80% iron by weight.

Which of the following is not one of the five key body characteristics that provide a good assessment of a person's overall health?

On a cold winter day the weather report gives the temperature as -5.0° F.What would this temperature be if reported on the Kevin scale?