1. A short quiz on Basic Chemistry Make sure you read all the questions carefully!

2. If the pH of stomach acid and oven cleaner (a base) were measured, The pH of stomach acid would be above 7 and the pH of the oven cleaner would be below 7 Both would be below 7 Both would be above 7 The pH of stomach acid would be below 7 and the pH of the oven cleaner would be above 7

3. Water molecules are polar, with the Oxygen and hydrogen sides being slightly negative Oxygen and hydrogen sides being slightly positive Oxygen side slightly negative and the hydrogen side slightly positive Oxygen side slightly positive and the hydrogen side slightly negative

4. Ice floats on water because Of cohesion Its molecules are less densely packed than Those of liquid water. Ice has a higher density than water Its molecules are more densely packed than those of liquid water

5. A solution is a Uniform mixture of two or more substances Breaking of a chemical bond Chemical reaction Combination of two or more liquids

6. Isotopes are atoms of the same element with the same number of protons and The same number of neutrons A different number of electrons A different number of molecules A different number of neutrons

7. The three particles that make up an atom are Positives, negatives and electrons Neutrons, isotopes and electrons Protons, neutrons and electrons Protons, neutrons and isotopes

8. The most common elements in most living things are Oxygen, carbon, sodium and nitrogen Oxygen, carbon, hydrogen and nitrogen Oxygen, carbon, hydrogen and calcium Oxygen, carbon dioxide, hydrogen and nitrogen

9. A substance with a pH of 6 is called An acid Neither an acid nor a base Both an acid and a base A base

10. Which of the following terms describes a substance formed by the chemical combination of two or more elements in a fixed ratio? isotope nucleus enzyme compound

11. A covalent bond is formed as a result of Sharing an electron pair Transferring protons Transferring electrons Sharing a proton pair

12. The nucleus is made up of Protons and electrons Protons, neutrons and electrons Electrons and neutrons Protons and neutrons

13. Identify the reactants in the chemical reaction: CO 2 + H 2 O  H 2 CO 3 CO 2 CO 2, H 2 O and H 2 CO 3 H 2 CO 3 CO 2 and H 2 O

14. When salt is dissolved in water, water is the Reactant Solvent Solution Solute

15. A pure substance that cannot be broken down into other substances by chemical means is A compound A mixture A solution An element

16. Substances that resist a change in pH is called A buffer An indicator A base An acid

17. The substances that are present when a chemical reaction begins are: The products The buffers The reactants The results of the chemical reaction

18. A chemical bond formed by the transfer of electrons is A covalent bond James Bond An ionic bond A molecular bond

19. The smallest possible particle of an element is A molecule An atom A compound A reactant

20. Anything that occupies space and has mass is Matter Heat Electricity Energy

21. If a neutral atom has 15 protons, it must also have 15 atoms 30 electrons 15 electrons 15 neutrons

22. Most of the mass is concentrated in the Electron cloud Inner electron levels Nucleus Outer energy levels EndRepeat