Welcome to your General Science Grade 8 Unit 2
Choose the correct answer from the given alternatives
1.
What is the smallest unit of an element that retains its chemical properties?
2.
How many naturally occurring elements are there on the periodic table?
3.
Which element is essential for all known forms of life?
4.
What is the chemical symbol for gold?
5.
Which element is a noble gas and commonly used in balloons for lifting?
6.
What subatomic particles are found in the nucleus of an atom?
7.
What is the charge of an electron?
8.
How many electrons can occupy the first energy level of an atom?
9.
What is the total number of electrons in a neutral atom of oxygen (O)?
10.
What is the chemical formula for water?
11.
What type of chemical bond involves the sharing of electrons between atoms?
12.
In an ionic bond, what happens to electrons?
13.
What is the name of a positively charged ion?
14.
Which compound is formed by the ionic bond between sodium and chlorine?
15.
What is the force that holds atoms together in a molecule?
16.
In a chemical equation, what do the numbers in front of the chemical formulas represent?
17.
What is the law of conservation of mass in chemical reactions?
18.
What type of reaction involves the exchange of ions between two compounds?
19.
What is the product of the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?
20.
What is the chemical symbol for methane?
21.
In which state of matter do particles have the least amount of energy and are closely packed together?
22.
What happens to the kinetic energy of particles as a substance undergoes melting?
23.
What is the process of a gas changing directly into a solid called?
24.
Which state of matter has a definite volume but no definite shape?
25.
What is a solute in a solution?
26.
What is the universal solvent?
28.
What is the term for a solution in which no more solute can be dissolved at a particular temperature?
29.
What is the process of separating the components of a solution using differences in boiling points?
30.
What is the pH of a neutral solution?
31.
What is the common property of acids?
32.
What is the pH range of acidic solutions?
33.
What is the chemical formula for hydrochloric acid?
34.
What is the common property of bases?
35.
What is the pH range of basic solutions?
36.
Which organic compound is the main component of cell membranes?
37.
What is the monomer of proteins?
38.
What is the primary function of carbohydrates in the body?
39.
Which organic compound stores and transmits genetic information?
40.
What is the monomer of nucleic acids?
