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Chemistry MCQ Science

Attempt now to check your rank among 11 students! 50 Questions 30 Mins

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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