Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
are positively charged
are negatively charged
have mass
travel in straight lines
Correct answer is D
Cathode rays travel in a straight line and can cast sharp shadows.
Cathode rays are negatively charged.
Electric field and magnetic field deflect cathode rays.
If an atom is represented as \( _{11}^{23}X \), which of the following deduction is correct?
it contains 12 protons
it forms a covalent chloride
its atomic number is 23
it is an alkali metal
Correct answer is D
Sodium has atomic / proton number of 11 and belongs to Group 1[alkali metals] on the periodic table
forces of attraction and repulsion are in equilibrium
gaseous molecules can occupy any available space
gaseous molecules will continue their motion indefinitely
gases can be compressed
Correct answer is C
An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.
A gas exerts pressure on its container because?
the molecules of a gas collide with the walls of the container
some of the molecules are moving faster than others
of the collisions of the molecules with each other
of the mass of the molecules of the gas
Correct answer is A
Gas pressure is the name given to the force exerted by gas particles colliding with the wall of their container.
224cm3
168cm3
112cm3
100cm3
Correct answer is B
1mole of gas at STP = 22.4dm\(^3\)
0.0075 mole of CaCO3 = xdm\(^3\)
cross multiply;
where 22.4dm\(^3\) = 22400cm\(^3\)
x * 1 = 0.0075 * 22400 → 168cm\(^3\)
the gas CO2 which evolved was gotten from CaCO3 so we use the number of moles of CaCO3 only