Question

9/25/25, 9:15 am exam 1

1. part a

an atom with an atomic number of 10 and a mass number of 24 would have ________.
14 electrons
10 neutrons
14 neutrons
24 protons

1. part a

the atomic number of any atom is equal to the number of electrons in its nucleus and is written as a sub - script to the left of its atomic symbol.
true
false

1. part a

isotopes differ from each other only in the number of electrons the atom contains.
true
false

1. part a

what does ch4 mean?
this was involved in a redox reaction.
there are four carbon and four hydrogen atoms.
there is one carbon and four hydrogen atoms.
this is an inorganic molecule.

1. part a

the fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds.
true
false

1. part a

mixtures are combinations of elements or compounds that are physically blended together but are not bound by chemical bonds.
true
false

Explanation:

Question 22:

The atomic number is equal to the number of protons. For a neutral atom, the number of electrons equals the number of protons. The mass number is the sum of protons and neutrons. So neutrons = mass number - atomic number = 24 - 10 = 14.

Question 23:

The atomic number is equal to the number of protons in the nucleus, not electrons in the nucleus.

Question 24:

Isotopes differ in the number of neutrons, not electrons.

Question 25:

In the chemical formula CH₄, the sub - script 4 after H indicates there are 4 hydrogen atoms and 1 carbon atom (when no sub - script is written for C, it is assumed to be 1).

Question 26:

In a mixture, there is no chemical bonding between components, while in compounds there is.

Question 27:

This is the definition of mixtures.

Answer:

1. 14 neutrons
2. False
3. False
4. There is one carbon and four hydrogen atoms.
5. True
6. True