About Chemistry

Following are some of the multiple choice questions on the Chemistry with answers that will help the students in developing their knowledge.

Chemistry MCQ

1. What is matter

  • Anything which is solid
  • Anything that takes up space and has mass
  • when something is wrong
  • none of the above

2. What is an atom

  • smallest part of the universe
  • smallest part of a substance
  • smallest part of anything
  • smallest part of water

3. Protons have ________________

  • negative charge, nucleus
  • positive charge, shells
  • positive charge , nucleus
  • neutral charge, nucleus

4. What is a carbohydrate?

  • A biological polymer that stores and transmits genetic information
  • a group of organic molecules that includes sugars, starches , and glucose
  • An oil used for your car
  • hydrocarbon that contains only single bonds

5. Mass number

  • number of protons
  • number of electrons
  • number of protons and electrons
  • number of protons and neutrons

6. What is a lipid?

  • A type of biological molecule that includes fats, oils, hormones, waxes, and components of cellular membranes
  • A carbon compound

7. What is a hydrocarbon?

  • A compound composed of carbon and water
  • A compound composed of carbon and hydrogen
  • A compound composed of carbon and oxygen
  • A compound composed of carbon and nitrogen

8. What is an organic Compound?

  • a group of molecules that contain calcium
  • A group of molecules that contain carbon-hydrogen bonds
  • A group of molecules that contain carbon
  • A group of molecules that contain water

9. Electrons

  • no charge, nucleus
  • positive charge, nucleus
  • negative charge, shells
  • negative charge, nucleus

10. Atomic Mass is the number of

  • protons and neutrons in the nucleus of an atom
  • protons and electrons in the nucleus of an atom
  • neutrons and electrons in the nucleus of an atom
  • none of the above

11. Which of the following is a compound?

  • Co
  • O2
  • C
  • CO2

12. Water is an element?

  • true
  • false

13. Which of the following is a pure substance?

  • air
  • granite
  • water
  • stainless steel

14. Atomic symbol

  • capital letter
  • lowercase letter
  • 2 capital letters
  • 2 lowercase leters

15. What are the building blocks of MATTER?

  • Atoms
  • Cells
  • Protons
  • Neutrons

16. Formaldehyde is

  • CH3CHO
  • HCHO
  • C6H5CHO
  • NONE OF THESE

17. P stands for

  • Phosphorus
  • Potassium
  • Possum
  • All of above

18. Atomic number is

  • the number of protons
  • the number of electrons
  • the number of neutrons
  • the location of an atom on the periodic table

19. N stands for

  • Nickel
  • Nitrogen
  • Ninja
  • Both A & B

20. The SI base unit for mass is the

  • gram
  • cubic centimeter
  • meter
  • kilogram

21. Silicon (Si) is in period 3 on the Periodic Table. What does this tell you about this element?

  • It is highly reactive with water.
  • It has 3 valence electrons.
  • It has 3 protons in its nucleus.
  • It has 3 energy levels/shells in its electron cloud.

22. C stands for?

  • cat
  • calcium
  • carbon
  • crypton

23. What is the mass number of at isotope that has 20 protons, 21 neutrons and 18 electrons?

  • 18
  • 20
  • 21
  • 41

24. The horizontal rows on the Periodic Table are referred to as which of the following?

  • Groups or Families
  • Periods or Rows
  • Columns or Rows
  • Valence or Orbitals

25. What charge will a sulfide ion have?

  • 3+
  • 2+
  • 2-
  • 3-

26. List the following from largest to smallest atomic radius.P, Cs, Co, Sr

  • P, Co, Sr, Cs
  • P, Cs, Co, Sr
  • Cs, Sr, Co, P
  • Sr, Cs, Co, P

27. How many valence electrons does magnesium have?

  • 1
  • 2
  • 12
  • 24

28. List the following in order of weakest to strongest ionization energy.P, Cs, Co, Sr

  • P, Co, Sr, Cs
  • Cs, Sr, Co, P
  • Sr, Cs, Co, P
  • P, Co, Cs, Sr

29. What does S stand for?

  • salt
  • sodium
  • sulfur
  • spit

30. An electron is

  • positively charged
  • neutral
  • negatively charged

31. Activation energy is

  • The energy to start a car
  • The energy needed to break down CO2
  • The energy needed to start a reaction
  • The energy used to digest food

32. Which is a chemical change?

  • Melting ice
  • A candle burning
  • Boiling water
  • frost forming inside the freezer

33. Why does electronegativity increase across a period?

  • Adding more energy levels makes the ve- further from the nucleus
  • There are more valence electrons in the outer shell
  • There are more protons  in the nucleus
  • There are less protons in the nucleus

34. Milk turning sour

  • Chemical Change
  • Physical Change 

35. Which of the following is an example of a heterogeneous mixture?

  • tap water
  • chunky peanut butter
  • orange-colored sugar water
  • gold ring

36. What is the relation between restoring force, f to the displacement q in Hooke’s law?

  • f = -kq
  • f = kq
  • f = kq2
  • f = -kq2

37. Which of these statements is true of the scientific method?

  • The steps may vary somewhat to suit the experiment.
  • Working scientists rarely use it.
  • Scientists must follow its steps exactly.
  • Scientists rarely publish results of experiments.

38. When 2.02 X 1023 is multiplied by 3.1 X 10-31, the product is

  • 6.3 X 10-8
  • 6.3 X 108
  • 6.3 X 1054
  • 6.3 X 10-54

39. The horizontal rows of the periodic table are called

  • periods
  • columns
  • groups
  • families

40. The average atomic mass for silicon will be closest to...

  • Si-28 (92% abundance)
  • Si-29 (5% abundance)
  • Si-30 (3% abundance)
  • All of above

41. If a Carbon atom has 6 protons, how many electrons will it have?

  • 2
  • 4
  • 6
  • 8

42. What is a pure substance made of two or more elements chemically combined in a set ratio. Ex: CO2 has a set ratio of 1:2, meaning for every one carbon atom there are two oxygen atoms.

  • element
  • compound
  • mixture
  • salad

43. How many protons does Carbon have?

  • 3
  • 4
  • 5
  • 6

44. If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:

  • 16
  • 32
  • 48
  • 64

45. Chalk and Vinegar

  • Compound 
  • Mixture 

46. Carbon has 4 valence electrons which means

  • it can only form bonds with carbon
  • it is stable
  • it can make ionic bonds
  • it wants to make 4 covalent bonds

47. How many valence electrons does Sulfur

  • 16
  • 32
  • 6
  • 3

48. How many valence electrons does Lithium have?

  • 1
  • 2
  • 3
  • 4

49. What is the symbol for chlorine?

  • C
  • Ch
  • Ce
  • Cl

50. Basic unit of matter - the smallest piece of matter known

  • Element 
  • Atom
  • Molecule
  • Compound

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