100 chemistry questions

 100 important chemistry questions for all exams*

1. What is the chemical symbol for gold? - Au

2. What is the first element on the periodic table - Hydrogen

3. What is the lightest element - 

Hydrogen

4. What is the heaviest naturally occurring element - 

Uranium


What is the formula for density?

Ans: Density = Mass / Volume


What is the SI unit of pressure?

Ans: Pascal (Pa)

What is the chemical symbol for iron?

Ans: Fe


What is the chemical symbol for silver?

Ans: Ag


What is the chemical symbol for sodium?

Ans: Na


What is the chemical symbol for potassium?

Ans: K


What is the chemical symbol for oxygen?

Ans: O


What is the chemical symbol for carbon?

Ans: C


What is the chemical symbol for hydrogen?

Ans: H


What is the chemical symbol for nitrogen?

Ans: N


What is the chemical symbol for chlorine?

Ans: Cl


What is the chemical formula for water?

Ans: H2O


What is the chemical formula for carbon dioxide?

Ans: CO2


What is the chemical formula for ammonia?

Ans: NH3


What is the chemical formula for sulfuric acid?

Ans: H2SO4


What is the chemical formula for table salt?

Ans: NaCl


What is the process of converting a solid directly into a gas called?

Ans: Sublimation


What is the process of converting a gas into a liquid called?

Ans: Condensation


What is the process of converting a liquid into a gas called?

Ans: Vaporization


What is the process of converting a liquid into a solid called?

Ans: Freezing


What is the process of converting a solid into a liquid called?

Ans: Melting


What is the basic unit of matter?

Ans: Atom


What is the smallest unit of an element that retains its chemical properties?

Ans: Atom


What is the total number of elements in the periodic table?

Ans: 118


What is the SI unit of energy?

Ans: Joule (J)


What is the SI unit of electric current?

Ans: Ampere (A)


What is the SI unit of temperature?

Ans: Kelvin (K)


What is the SI unit of time?

Ans: Second (s)


What is the SI unit of frequency?

Ans: Hertz (Hz)


What is the SI unit of power?

Ans: Watt (W)


What is the SI unit of charge?

Ans: Coulomb (C)


What is the SI unit of velocity?

Ans: Meter per second (m/s)


What is the SI unit of force?

Ans: Newton (N)


What is the SI unit of electric potential?

Ans: Volt (V)


What is the SI unit of resistance?

Ans: Ohm (Ω)


What is the SI unit of capacitance?

Ans: Farad (F)


What is the SI unit of frequency?

Ans: Hertz (Hz)


What is the SI unit of magnetic field strength?

Ans: Tesla (T)


What is the SI unit of magnetic flux?

Ans: Weber (Wb)


What is the SI unit of inductance?

Ans: Henry (H)


What is the SI unit of electric charge?

Ans: Coulomb (C)


What is the SI unit of luminous intensity?

Ans: Candela (cd)


What is the SI unit of radioactivity?

Ans: Becquerel (Bq)


What is the SI unit of activity (for enzymes)?

Ans: Katal (kat)


What is Avogadro's number?

Ans: 6.022 × 10^23


What is the name of the process where a solid changes directly into a gas without passing through the liquid state?

Ans: Sublimation


What is the term for a substance that speeds up a chemical reaction without being consumed in the process?

Ans: Catalyst


What is the process of separating the components of a mixture based on their boiling points called?

Ans: Distillation


What is the process of converting a solid into a gas without passing through the liquid state called?

Ans: Sublimation


What is the term for a substance that changes color in the presence of an acid or a base?

Ans: Indicator


What is the term for a substance that donates hydrogen ions (H+) in a chemical reaction?

Ans: Acid


What is the term for a substance that accepts hydrogen ions (H+) in a chemical reaction?

Ans: Base


What is the term for a solution with a pH less than 7?

Ans: Acidic


What is the term for a solution with a pH greater than 7?

Ans: Basic or alkaline


What is the term for a solution with a pH of 7?

Ans: Neutral


What is the term for a compound that contains carbon and hydrogen?

Ans: Hydrocarbon


What is the term for the process of breaking down complex substances into simpler ones by the action of heat or a catalyst?

Ans: Decomposition

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