Chemistry Quiz 28 (25 MCQs)

Quiz Instructions:

Select an option to see the correct answer instantly.

1. He was the Greek philosopher who thought that all matter is composed of water.

2. The attraction between two molecules of the SAME substance is called _____

3. What is the meaning of Synthetic Rubber?

4. An experiment should be carried out in the fume cupboard if it involves

5. An atom has 5 protons, 7 neutrons and 5 electrons. What is the mass number of the atom?

6. Balance this equation _____ Al + _____ HCl $\rightarrow$ _____ H2 + _____ AlCl3

7. The tiny core of an atom containing most of the mass of the atom is the:

8. Properties of gases and liquids are.

9. There are _____ kinds of chemical bonds.

10. Lakium is present in the largest amount in a human body Name the element which is present in the smallest amount.

11. Energy required to remove the 1st electron from an atom.

12. Which of the following will slow down the rate of a chemical reaction

13. Ionic substances have which type of structure?

14. Any organism which is harmful or destructive for human beings, crops or useful plants is called.

15. The smallest particle of an element that retains its identity in a chemical reaction.

16. A $ free\ radical$ is _____

17. Which metal is used in fluorescent tubes, ammunition and thermometers?

18. What determines the number of protons in an atom?

19. During an endothermic reaction, energy will be _____

20. Which of the following best explains the relationship between molecules and atoms?

21. Which state of matter has a fixed shape and volume and it's molecules move very slowly?

22. The building blocks of _____ are fatty acids, which contain a carboxyl group and a hydrocarbon chain.

23. The study of compounds that do not contain carbon.

24. A change in matter in which the substances that make up the matter change into other substances with different chemical and physical properties

25. What is the atomic number of calcium (Ca)?