BIOLOGY HELP? please?

Question

WHAT IS THE CHARGE OF AN ION OF SODIUM WITH 11 PROTONS AND 10 ELECTRONS?

A. POSITIVE

B. NEGATIVE

C. NEUTRAL

D. IMPOSSIBLE TO TELL FROM THE INFORMATION GIVEN

WHAT TYPR OF MOLECULE IS A POLAR MOLECULE

A. A MOLECULE OF NaCl

B. a molecule of NaOH

C. A hydrogen molecule

d. a moleculee of water

in the formula NaOH>NA+ + OH-, which is the reactant?

a. Na

b. O

c. OH

d. NaOH

Answer 1

Ahh this is pretty much chemistry, but anyway...

Q1. A: Positive. Electrons have a relative charge of negative one, while protons have a charge of positive one (these arent the actual values but when dealing with questions such as this you only need relative charges.) An atom that hasnt become and ion has an equal amount of electrons and protons, and therefore a nuetral charge (no charge). Only electrons can move, protons are fixed. If it gains an electron, it is said to gain a negative charge, and vice versa if it loses one.

Q2. D: water. To be a polar molecule, or an electric dipole, a molecule must have a positive charge at one end and a negative at the other. While the molecule is overall electrically neutral, the two hydrogen atoms are positioned more to one end of the molecule then evenly distributed. Being negative, these two give that end a positive charge, and the oxygen atom gives the other end a negative charge. This is the reason for surface tension.

eg water is composed like this :

  O

H  H

Q3. D: NaOH. This is what is called a decomposition reaction, where one reactant goes in, and two products come out. Another example of this is taking water and using electrolysis to decompose it into hydrogen and oxygen.

Answer 2

it isn't biology, it's chemistry.

1) negative

2) d

3) Na

Answer 3

1-negative

2-d

3-na