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3 years ago

16) The mass number of an element whose atoms have 12 protons and 13 neutrons is_

Chemistry

1 answer:

Bess [88]3 years ago

6 0

The answer is c) 25 because the mass number is the # of protons and neutrons in the nucleus, therefor, 12 + 13 = 25

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Building Vocabulary

Juliette [100K]

Answer:

Explanation:

Building Vocabulary

Match each term with its definition by writing the letter of the correct definition on

the line beside the term in the left column.

5. nucleus b

6. proton f

7. neutron h

8. electron d

9. atomic number g

10. isotopes c

11. mass number a

12. energy level e

a. the sum of protons and neutrons in the nucleus of an

atom

b. the very small center core of an atom

c. atoms of the same element that differ in the number

of neutrons, but have the same number of protons

d. the particle of an atom that moves rapidly in the

space outside the nucleus

e. a specific amount of energy related to the movement

of electrons in atoms

f. the particle of an atom with a positive charge

g. the number of protons in the nucleus of every atom

of an element

h. the particle of an atom that is neutral

-. mass number a.

12. energy level e

5 0

2 years ago

Net ionic equation for Barium chloride

vaieri [72.5K]

Answer: There is one way to write it but i’ll also provide an unbalanced equation and a balanced one.

Explanation:

Unbalanced : Ba (aq) + Cl2 (aq)—-> BaCl (aq)

Balanced : 2Ba (aq) + Cl2 (aq)—> 2BaCl(aq)

3 0

3 years ago

Which is a major environmental concern for our oceans?

padilas [110]

Plastic pollution is the correct answer

3 0

2 years ago

Read 2 more answers

State what would be observed when the following pairs of reagents are mixed in a test tube.

Mandarinka [93]

Answer:

(i). C6H2COOH and Na2CO3(aq)

observation: Bubbles of a colourless gas (carbon dioxide gas)

(ii) CH3CH2CH2OH and KMnO4 /H

observation: The orange solution turns green.

[This is because oxidation of propanol to propanoic acid occurs]

(iii) CH3CH2OH and CH3COOH + conc. H2SO4

observation: A sweet fruity smell is formed.

[This is because an ester, diethylether is formed]

(iv) CH3CH = CHCH3 and Br2 /H2O

observation: a brown solution is formed.

4 0

3 years ago

An oxide and carbonate containing oxygen

exis [7]

Answer:

example of carbonate containing oxygen :

CaCO3

( calcium carbonate having 3 atoms of oxygen )

example of oxide containing oxygen :

( carbon dioxide having 2 atoms of oxygen )

5 0

3 years ago