Grade 10 Science Exam

Question 1

Atoms? What are they?

Answer 1

Atoms are tiny neutral particles that make up Matter. They can’t be broken down or seen by the naked eye.

Question 2

chemical and physical properties?

Answer 2

physical properties:
- changed that don’t produce a new substance; melting.

Chemical properties:
- changes that DO create a new substance.
-colour
-odour
- gasses formed (bubbles)
-

Question 3

What is Atomic mass and Atomic #

Answer 3

Atomic # : Hoe many protons & Electrons the element has

Atomic Mass: #of Protons + # of Nutrons = Atomic Mass

Question 4

Some properties of metals and non metals.

Answer 4

Metals:
-Shiny
-good heat and electric conductors
- hard solids

Non-Metals:
-dull
- Not good heat conductors
-soft

Question 5

Metalloids

Answer 5

you can produce metalloids if you combine metal and non-metal elements.

Question 6

ions, cation, anions,
Ionic compounds

Answer 6

An atom becomes into an ion when it gains a proton or electron.

metals : Cation- gains proton; positive charge

non-metals: gain electrons; Anions- gains electrons ; Negative charge

ionic compound:
-Non-metal , metals react to form an ionic compound
-ionic compound have high melting points and dissolve in substances that conduct electricity.
- ionic compounds form these 3 dimensional structure called crystal lattice with many kinds of ions, and a fixed ratio held together by their opposite charges

Question 7

Polyatomic ions :

Answer 7

• groups of atoms that stay together with an overall charge.
  -in the group of atoms is 1 anion or cation