1.) Which of the following substances does not have polar covalent bonds? CO2 ,

Question

1.) Which of the following substances does not have polar covalent bonds?

CO2 , CH4 , H2, NH3

2.) According to Bronsted-Lowry definition, which chemical in the following reaction is the acid?

HNO2 + HS- --> H2S + NO2-

3.)  According to Bronsted-Lowry definition, which chemical in the following reaction is the base?

NH3 + HNO3 --> NH4+ +NOH3-

4.) In a DNA double helix, adenine pairs with ____ and guanine pairs with ____.

a.) cystosine; thymine

b.) guanine; adenine

c.) uracil; cystosine

d.) thymine; cystosine

e.) cystosine; uracil

5.) Which of the following is not an unsaturated fatty acid?

a.) CH3CH2CH2CH2CH2CH=CHCOOH

b.) CH3CH2CH2CH=CHCH=CHCOOH

c.) CH3CH2CH2CH2CH2CH2CH2COOH

d.) CH3CH2CH2CH2CH2CH2CH2CH=CHCOOH

e.) CH3CH2CH2CH=CHCH2CH=CHCOOH

Explanation / Answer

1) H2

2) HNO2

3) NH3

4) d.) thymine;cystosine

5) c.) CH3CH2CH2CH2CH2CH2CH2COOH

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