Which of the following does NOT show a chemical change? *
a. Change of state of matter
b. production of gas
c. Color change
d. change in size

Curdling of milk is an example of what chemical evidence?
a. formation of gas
b. change in temperature
c. evolution of heat and light
d. formation of precipitate

Lithium atomic number is 3, it has 2 electrons and 4 neutrons in its atom, what is the charge?
a. -1
b. +1
c. 0
d. neutral
A Ca2+ atom ions differ from a Ca0 in that the Ca2+ ion has
a. fewer electrons
b. more electrons
c. fewer protons
d. more protons

When an atom loses electrons, it is called a/an_______ and has a_______ charge.
a. Anion, positive
b. Cation, positive
c. Anion, negative
d. Cation, positive

Atom of sodium has an atomic number 11 and a mass number of 23. Which of the following statements is correct?
a. An atom of sodium has 11 protons, 11 electrons and 11 neutrons
b. An atom of sodium has 11 protons, 12 electrons and 11 neutrons
c. An atom of sodium has 11 protons, 11 electrons and 12 neutrons
d. An atom of sodium has 11 protons, 12 electrons and 12 neutrons

What is the mass of the atom having 53 protons and 74 neutrons?
a. 21amu
b. 74amuOption 2
c. 127amu
d. 53amu

Which Sub-atomic particles are responsible for the mass of an atom?
a. protons and neutrons
b. electrons and neutrons
c. protons and electrons
d. protons, electrons and neutrons

Explain what to do if you want to find the number of neutrons in an element
a. Use the atomic mass
b. Subtract the atomic number from the atomic mass number
c. Subtract the mass number from the atomic number
d. Use atomic number

Which of the following sub-atomic particles will have a number equivalent to the atomic number of an atom?
a. number of electrons
b. number of neutrons
c. number of orbitals
d. number of protons