About Chemistry

The study of matter and the chemicals that make up matter is the focus of the scientific field known as chemistry. Chemistry is a subfield of science. In addition to this, it discusses the characteristics of the chemicals as well as the chemical processes that they go through to produce new compounds. Atoms, ions, and molecules are the primary points of concentration in chemistry. These constituents, in turn, are responsible for the formation of elements and compounds. These chemical species have a propensity to communicate with one another through the formation of chemical bonds. It is essential to be aware that the study of chemistry also investigates the interactions that take place between different forms of matter and energy.

Relationship Between Chemistry and Other Branches of Science

The word "science" refers to the methodical investigation of the natural world, its composition, and everything that it entails. Because the natural world is so vast, the scientific community has partitioned itself into a number of subfields, each of which focuses on a particular component of the cosmos. These fields of study can be categorized into one of the following three basic divisions of the scientific discipline:

  • The Formal Sciences: The study of language disciplines that are concerned with formal systems is what is meant by "the formal sciences." Logic and mathematics are two examples of scientific fields that might be categorized under this heading. One way to think about it is as the "language of science."
  • The Natural Sciences: Involve the investigation of natural occurrences via a combination of experimentation and observation. This branch of science encompasses chemistry, physics, and biology as its subfields.
  • The Social Sciences: The study of human societies and the inter-human connections that exist inside such civilizations is what the social sciences are all about. The scientific fields of psych`ology, sociology, and economics are all examples of those that are included in this group.

Examples of Chemistry in Our Daily Lives

Around us, chemical reactions are happening all the time. There are  thousands of chemical reactions taking on in our bodies every day. All biological functions, from the digestion of food to the movement of muscles, are chemically mediated. Here are a few more instances of how chemistry affects our daily life.

  • Photosynthesis is a chemical mechanism that allows plants to produce glucose and oxygen from water, sunshine, and carbon dioxide. The entire food chain is constructed on the foundation of this process.
  • Emulsification is a chemical process that is used to make soaps and detergents that are used for cleaning. In addition, the chemical process of saponification is used to create them.

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

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
  • none of the above

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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