CHEMICAL.CALCULATIONS FINAL XA Choose the response that includes all the iter is
ID: 694560 • Letter: C
Question
CHEMICAL.CALCULATIONS FINAL XA Choose the response that includes all the iter isted below that are pure substances ms &.ow many protons, clectrons neutrons are in"1 orange juice , occan water v. vegetable soup steam iv, oxygen LA) 48 protons, 20electrons (11) 22 protons, 24 electrons (C) 22 protons, 22 electron (D) 22 protons, 20 electros (13) i, iv (C) iv only (D) all of them are pure 9 How many sodium ions a N Co(Molar Mass (A)113 10 jons C) 1.42 10 ions 2. Which one of the following represents a chemical change? (A) boiling water to form steam (B) burning a pieee of coal (C) breaking glass (D) mixing iron filings and sand at room Ikg 2.20 lb) (A) 8.8 x 10 mg (C) 1.8 x 10 mg temperature 1 1. What mass in gram 3. 2.4 km is how many millimeters? make 500, mL of (A) 0.250g (C) 13.0 g (A) 2.4 x 103 mm (B) 2.4 10'mm (C) 2.4 x 10% mm (D) 2.4 10 mm 12. Do the arithmer to the correct r (A) 2.0192 (C) 2.019 (E) 2.01919 4. What is the symbol for the metric unit microliter? (B) CL (D) none of these (C) mL 13. The numbe significan 5. Express the number 26.7 in scientific notation (A) 2.67 ×102 (B) 2.67 x 101 (C) 2.67 x 1O (D) 26.7 4. Convert our How many significant figures are there in 1.3070 g? 6. (A) 2.8 (A) 6 (B) 5 (C)4 (D) 3 (E) 2 15. The form 7. What is the name of V2S3? (A) Vanadium(III) sulfide (B) Vanadium(II) sulfide (C) Vanadium sulfide (D) Divanadium trisulfide (C SAVANNAH STATE UNIVERSI CHEM1115Explanation / Answer
1.
Answer is option (B) ii, iv.
Steam is water in gaseous state and oxygen is pure element.
2.
Answer is option (B) burning a piece of coal.
Coal is a form of carbon and when coal is burned it produces CO2.
3.
Answer is option (C)
2.4 Km
1 Km = 1000 m
1 m = 100 cm
1 cm = 10 mm
So, 1 Km = 1000 x 100 x 10 mm = 1 x 106 mm
So, 2.4 Km = 2.4 x 106 mm = 24 x 105 mm
4.
Answer is option (A)
5.
Answer is option (C) 2.67 x 101
6.
Answer is option (B) 5
All non-zero digits are significant.
In a number with a decimal point, trailing zeros (those to the right of the last non-zero digit) are significant.
7.
Answer is option (A) Vanadium (III) sulfide.
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