1. For which of the following activities might you want to hire a chemist?A. testing a sample of water from a well
B. finding a comet
C. examining the structure of plant cells
D. building a garage

2. Which of the following procedures involves a physical change in one of the substances?
A. creating salt by reacting sodium metal and chlorine gas
B. allowing a nail to rust
C. building a model rocket propelled by mixing baking soda and vinegar
D. grinding chalk into a fine powde 3. You have three molecules of glucose (3C6H12O6). How many oxygen atoms do you have?
A. 1
B. 3
C. 6
D. 18

Answers

Answer 1

Answer: 1. For which of the following activities might you want to hire a chemist?A. testing a sample of water from a well

2. Which of the following procedures involves a physical change in one of the substances?
D. grinding chalk into a fine powder

3. You have three molecules of glucose (3C6H12O6). How many oxygen atoms do you have?
C. 6

Answer 2

Answer:

Question 1:

The right answer is A

Chemistry is a science of experimental nature that studies the composition of matter and its transformations.

Chemistry is thus interested in the elements that constitute matter (atoms, ions, etc.), in their properties and in the chemical bonds that can be created between them.

Question 2:

The right answer is A

Sodium chloride is an ionic chemical compound of the formula NaCl. It is more commonly called table salt or cooking salt, or simply salt in everyday language.

It is clear that it exists in the form of solid salts.

during his training, there was a physical change of sodium (metal) and chlorine (gas) into a salt.

Question 3:

This question is a little bit tricky

If we assume that the question is aimed at finding the total number of oxygen in all three molecules together, the answer is 18.

A glucose molecule is made up of 6 atoms of oxygens if we have three glucose molecules (assuming that they are bound), we multiply by 3 and this gives us 18 oxygen atoms.

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In pigs, the allele for a wavy, rough coat (R) is dominant to the allele for a soft, fine coat (r). A rough coat boar and a soft coat sow mate. They produce several litters, 50% are rough coat and 50% are smooth coat. What were the genotypes of the parents?

Answers

1. Do a pun-net square.
R r
r
r
2. The offspring would be Rr, rr, Rr, rr
3. 2 of them are heterozygous(Rr),which means they would be most likely rough coats
4. Two of them are homozygous for short hair (rr) which means they are going to be soft hair.
5. Your answer is
Rr, rr

Answer:

Genotype of rough coat boar - Rr

Genotype of soft coat sow mate - rr

Explanation:

Rough coat boar must be heterozygous with one dominant allele (R ) and one recessive allele (r )

Genotype of rough coat boar - Rr

Genotype of soft coat sow mate – rr

Now if these two parents are crossed , the offspring produced are represented in the punnet square below –

R r

r Rr rr

Thus, 50 % of the offspring’s have rough coat (Rr) and 50 % of the offspring’s have smooth coat.

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Answers

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Answers

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Answers

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Answers

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Answers

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