PAST BOARDS

Question 1

How many significant figures does this number have: 104,000

Answer 1

3

Question 2

Convert this number to PROPER scientific notation: 0.000780 x 10^-8

Answer 2

7.80 x 10^-12

Question 3

Using proper scientific notation, how would you round the number 9.9813 x 10^-5 to two significant figures?

Answer 3

1.0 x 10^-6

Question 4

Using the rule for multiplication and division, what is the answer to this calculation: (8.090 mg)÷(0.009 mL)

Answer 4

900 mg/L

Question 5

The answer to the calculation below should be reported to how many significant figures?

[(97+19.5)÷(434.97)] =

Answer 5

2

Question 6

The law that regulates the practice of chemist and chemical technician in the Philippines

Answer 6

RA 10657

Question 7

Convert 110.00°C to °F:

Answer 7

43.333°F

Question 8

A chemist measured the mass of a wire using an analytical balance with the least count 0.001 g. The measured value should be recorded as:

Answer 8

5.320 cm

Question 9

What do we mean by ethics?

Answer 9

-Moral judgments
-Rules or standards governing a profession
-Determinants of what is right or wrong

Question 10

The study of __________, as contrasted with legal, obligations is called ethics.

Answer 10

Moral

Question 11

The study of __________, as contrasted with legal, obligations is called ethics.

Answer 11

Moral

Question 12

What do you call a conbination of two or more materials which retain their individual properties and can be separated by physical means

Answer 12

mixtures

Question 13

A polar solute usually dissolves in a polar solvent and a non polar solute dissolves in a non polar solvent. This is __________.

Answer 13

“like dissolves like” rule