Question

grade 10 science: diagnostic test
answer the following questions in the space provided. use the periodic table in the back cover of the text book.

1. what does whmis stand for? workplace hazardous materials information system
2. what does hhps stand for? hazardous household product symbol
3. in a chemical change, a new substance is produced.
4. the starting materials in a chemical reaction are called reactants.
5. a(n) element is a sample of matter containing only one type of atom
6. are shiny, malleable, and conduct electricity.
7. the is the core of an atom, containing most of its mass.
8. which of the following is an example of a chemical change?

a. ice freezes.
b. a car rusts.
c. sugar dissolves in a cup of coffee
d. a coffee mug shatters.
e. a cloud forms.

1. which of the following is used to organize the modern periodic table?

a. atomic number
b. atomic mass
c. number of neutrons
d. atomic size
e. state at room temperature.

1. how many protons, neutrons and electrons are there in an atom of aluminum?
2. neon is a noble gas. find it in your table.

a. what is its atomic number?
b. how many protons are there in the nucleus?
c. how many electrons does it have in its outer shell?
d. is the outer shell full?
e. what are the electrons in the outer shell called?

1. how many electrons are in each orbital for an element that has 13 electrons?
2. what are three signs that a chemical change has taken place?

Explanation:

1. WHMIS is Workplace Hazardous Materials Information System. It is a system in Canada for providing information about hazardous materials in the workplace.
2. HHPS is Hazardous Household Product Symbol. It is used to identify potentially hazardous household products.
3. In a chemical change, a new substance is produced. The starting materials in a chemical reaction are called reactants.
4. An element is a sample of matter containing only one type of atom.
5. Metals are shiny, malleable, and conduct electricity.
6. The nucleus is the core of an atom, containing most of its mass.
7. A chemical change involves the formation of a new substance. Rusting of a car is a chemical change as iron reacts with oxygen to form iron - oxide. Ice freezing, sugar dissolving, a coffee mug shattering, and cloud formation are physical changes.
8. The modern periodic table is organized by atomic number.
9. For aluminum (Al), atomic number = 13, so number of protons = 13, number of electrons = 13. Mass number of common Al isotope is 27, so number of neutrons=27 - 13 = 14.
10. Neon (Ne) has atomic number 10. a. Atomic number is 10. b. Number of protons in nucleus is 10. c. Outer shell has 8 electrons. d. Outer shell is full. e. Electrons in outer shell are called valence electrons.
11. For an element with 13 electrons (Al), electron configuration is 2 in first orbital, 8 in second orbital, 3 in third orbital.
12. Signs of a chemical change include production of a gas, formation of a precipitate, change in color, change in temperature (exothermic or endothermic).

Answer:

1. Workplace Hazardous Materials Information System
2. Hazardous Household Product Symbol
3. chemical; reactants
4. element
5. Metals
6. nucleus
7. b. A car rusts.
8. a. atomic number
9. Protons: 13, Neutrons: 14, Electrons: 13
10. a. 10; b. 10; c. 8; d. Yes; e. Valence electrons
11. 2 in first orbital, 8 in second orbital, 3 in third orbital
12. Production of a gas, formation of a precipitate, change in color