1. Solve (1 point): 2.345 +3.2 2. What is the density of an object that has a ma
ID: 542411 • Letter: 1
Question
1. Solve (1 point): 2.345 +3.2 2. What is the density of an object that has a mass of 8.24 g and displaces 4.6 mL of water when submerged in water (1 point)? 3. Describe what is a homogenous mixture and give an example of one (2 points). 4. How many significant figures are in each of the following (1 point each): a) 11.500 g b) 0.003 knm c) 4.0310 L e) 3.20 x 10 5. Name and give the correct chemical symbol for three alkali metals found on the periodic table (3 point)? 6, Solve (1 point): 2.00 x 6.000 = 7. How many atoms are in 3.5 gal of water (3 points)? 8. Give the correct name for the following chemical formula FeCl, (I point)? a) FeCl b) CF c) K,SO4 d) SO, e) Co CoCl 9. If carbon has 6 protons and 7 neutrons what is the mass of carbon (Ipoint)?Explanation / Answer
1) 2.345+3.2 = 5.545
rounded off to = 5.4
2) density = mass/volume
= 8.24/4.6
= 1.79 g/ml
3) homogeneous mixture = when two or more components are mixed. if all are in the same phase.its called homogeneous.
ex: sugar solution( sugar dissolved in water)
salt solution (salt dissolved in water )
4) a) 5 significant digits
b) 1
c) 5
d) 3
5) Na = Sodium
K = Potasium
Rb = rubedium
CS = cesium
6) 2.00*6.000 = 12.0
7) mass of water = 3.5*3785.4118 (1 gal = 3785.4118 grams )
no of mol of water = 3785.4118/18
= 210.3 mol
8) a) FeCl3 = iron(III)chloride
b) CF4 = carbontetraflouride
c) K2SO4 = potasium sulphate
d) so2 = sulphur dioxide
e) CO = carbon monoxide
f) C0Cl2 = cobalt(II) chloride.
9) mass of C = 6+7 = 13
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