COMMUNITY COLLEGE OF RHODE ISLAND CHEM 1030 Quiz #1 Name 1. Organic Chemistry is

Question

COMMUNITY COLLEGE OF RHODE ISLAND CHEM 1030 Quiz #1 Name 1. Organic Chemistry is the study of 2. How many significant figures are there in 0.006710 g? 3. Classify each of the following as a chemical or physical change. A. Water boiling B. Hard boiling an egg C. Sugar dissolving D. Silver earring tarnishing 4. Which of the following is a homogeneous mixture? a) Sweat b) Chicken soup c) Hydrogen peroxide d) Stirred pond water 5. Which of the following is an example of a physical change? a) Natural gas burns in a stove b) The liquid propane in a gas grill evaporates because the valve was left open c) A bicycle frame rusts on repeated exposure to air and water d) Sodium iodide reacts with silver nitrate to give a white precipitate

Explanation / Answer

1.

Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of carbon-containing compounds.

2.

write in terms of scientific notation to get a better picture of significant figures

6.710 x 10-3 g

has 4 significant figures

digits present after decimal point is significant and zeros are not significant when present before a non zero digit

as in our case 0.00 is non significant

3.

water boiling is physical change

hard boiling of egg is a chemical change as it cannot be reversed by cooling again

sugar dissolving is physical change as when water is evaporated,sugar can be retrived back

silver earring tarnishing is a chemical change and cannot be traced back by simple cooling or any physical process

4.

homogeneous mixture is uniform in nature throughout

a) sweat

c) hydrogen peroxide

chicken soup has chicken pieces in it and hence not homogeneous

stirred pond water should have mud it that and not homogeneous

5.

(b) evaporation is physical process all others are involved with chemical process

6.

(c) law of conservation of mass

7.

all are already matched correctly

current ampere

time second

mass kilogram

8.

screening , distillation and sedimentation

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