CHEM110 SI SESSION 1

6. How many significant figures should there be in the answer to the following calculation:

(29.2 − 20.0)(1.790)  

             1.39

• A   1

• B   2

• C   3

• D   4

7. What is the most correct answer to the calculation shown below?

(3.8621 × 1.563) – 5.98

• a)  0.06

• b)  0.0565

• c)  0.05646

• d)  0.056462

8. If the temperature in Durban is 32°C. What is this temperature in Kelvin?

• A  7.587 K 

• B  273.4 K

• C  241.15 K

• D  305.15 K

9. The volume of 30.0 g of ethanol [C2H6O(ℓ), density = 0.789 g mL-1] is

• A   26.3 mL

• B   33.3 mL

• C   0.380 L

• D  38.0 mL

10. An ⁵⁶Fe²⁺ particle contains

• A   26 protons, 26 neutrons, and 26 electrons.

• B   28 protons, 28 neutrons, and 26 electrons.

• C   26 protons, 30 neutrons, and 24 electrons.

• D   54 protons, 56 neutrons, and 52 electrons.

13. Determine the oxidation state of oxygen in OF2.

• A   -1

• B   -2

• C  +2

• D  +1

14. What is the name of the following compound:  NaClO₂?

• A)   sodium chlorite

• B)   sodium perchlorate

• C)   sodium chlorate

• D)  sodium hypochlorite

Tags

NGSS.HS-PS1-1

15. What is the chemical formula of tin(II) phosphate?

• A TnPO

• B Tn(PO3)₂

• C SnPO₂

• D Sn3(PO4)₂

Tags

NGSS.HS-PS1-2

16. Titanium(III) carbonate is the correct name for which of the following compounds?

• a) Ti3(CO3)2

• b) Ti2CO3

• c) Ti3CO3

• d) Ti2(CO3)3

19. What is the molarity of sodium sulfate, Na2SO4 (molar mass = 142.1 g mol-1) 

if  24.3  g  of  sodium  sulfate  is  dissolved  in  enough  water to  produce  500.0  mL  of

solution?

• A  0.0342 M

• B  0.00342 M

• C 0.342 M 

• D 0.000342 M

Tags

NGSS.HS-PS1-7