Question 1

Do the following calculation and express the answer using the correct number of significant figures.______ = (342)* (0.0012)÷ 100.0

Accepted Answer

A) 0.00410 
B) 0.0041 
C) 4.10 *10-3 
D) 0.004104

Question 2

A Celsius degree is the same size as a Kelvin degree.

Accepted Answer

A) True 
 B)False

Question 3

A particular medication is a heterogeneous mixture.Since heterogeneous mixtures are consistent throughout,this medication does not need to be shaken.

Accepted Answer

A) True 
 B)False

Question 4

If the first ingredient on the label of a cosmetic is "active ingredient",the cosmetic is also regulated as a drug.

Accepted Answer

A) True 
 B)False

Question 5

How can the volume of an irregular unknown object be measured?

Accepted Answer

A) using a ruler to measure length,width,and depth 
B) measuring the volume of water displaced by the object 
C) obtaining the mass of the object 
D) measure the radius and use V= $\pi$r2

Question 6

Which of the following is an SI unit?

Accepted Answer

A) gram 
B) liter 
C) meter 
D) calorie

Question 7

If 3333 is divided by 5.0,the answer should have two significant figures.

Accepted Answer

A) True 
 B)False

Question 8

Two pure substances A and B react to form a new pure substance C.From this,we may conclude that

Accepted Answer

A) A and B are both elements 
B) C is a compound,A and B may or may not be elements 
C) C is an element,A and B are compounds 
D) A,B,and C are all compounds

Question 9

How many significant figures are used in expressing a measurement as 0.2503 L?

Accepted Answer

A) one 
B) two 
C) three 
D) four

Question 10

Molarity (M)is calculated as:  .M would be considered a derived unit.

Accepted Answer

A) True 
 B)False

Question 11

A sample of urine is measured to have the density of 1.15 g/mL which is an indicator that there may be a medical problem.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is an example of a homogeneous mixture?

Accepted Answer

A) NaOH solution 
B) mortar (mixture of water,sand and cement) 
C) vinegar and oil salad dressing 
D) more than one response is correct

Question 13

As two clear liquid solutions are thoroughly mixed,a red solid forms.This change is most likely _____ .

Accepted Answer

A) physical. 
B) chemical. 
C) neither chemical nor physical. 
D) both chemical and physical.

Question 14

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?

Accepted Answer

A) It is an element 
B) It is a compound 
C) It is either an element or compound 
D) Impossible to predict

Question 15

A monoatomic molecule cannot be reduced to a simplier chemical.

Accepted Answer

A) True 
 B)False

Question 16

The yard is considered a derived SI unit.

Accepted Answer

A) True 
 B)False

Question 17

Express the following "generic" number in standard notation. X.XX *104

Accepted Answer

A) 0.000XXX 
B) XX,X00 
C) X,XX0 
D) 0.00XXX

Question 18

It turns out that the dark side of the moon has as a mean temperature of -280 oF.What would that the temperature be on the Kelvin scale?

Accepted Answer

A) -553 K 
B) -7 K 
C) 100 K 
D) 173 K

Question 19

If a 200 gram sample of water is partially frozen forming 40 g of ice,than 80% of the original sample is still a liquid.

Accepted Answer

A) True 
 B)False

Question 20

Over the counter (OTC)medicines are dangerous because they are not regulated.

Accepted Answer

A) True 
 B)False

Exam 1: Matter, measurements, and Calculations

Do the following calculation and express the answer using the correct number of significant figures.______ = (342) * (0.0012) ÷ 100.0

A Celsius degree is the same size as a Kelvin degree.

A particular medication is a heterogeneous mixture.Since heterogeneous mixtures are consistent throughout,this medication does not need to be shaken.

If the first ingredient on the label of a cosmetic is "active ingredient",the cosmetic is also regulated as a drug.

How can the volume of an irregular unknown object be measured?

Which of the following is an SI unit?

If 3333 is divided by 5.0,the answer should have two significant figures.

Two pure substances A and B react to form a new pure substance C.From this,we may conclude that

How many significant figures are used in expressing a measurement as 0.2503 L?

Molarity (M)is calculated as: .M would be considered a derived unit.

A sample of urine is measured to have the density of 1.15 g/mL which is an indicator that there may be a medical problem.

Which of the following is an example of a homogeneous mixture?

As two clear liquid solutions are thoroughly mixed,a red solid forms.This change is most likely _____ .

After heating,a pure substance,A,is found to produce both B and C.What can be said about the substance A?

A monoatomic molecule cannot be reduced to a simplier chemical.

The yard is considered a derived SI unit.

Express the following "generic" number in standard notation. X.XX *10⁴

It turns out that the dark side of the moon has as a mean temperature of -280 ^oF.What would that the temperature be on the Kelvin scale?

If a 200 gram sample of water is partially frozen forming 40 g of ice,than 80% of the original sample is still a liquid.

Over the counter (OTC)medicines are dangerous because they are not regulated.