A
When the teacher experiments, one needs to keep him/herself safe. Write down one way he/she could do this.
Goggles or wear lab coat
hydrogen gas
When this metal is added to water, it produces hydrogen gas and metal hydroxide. It is very reactive and hydrogen gas catches fire. What is this metal?
Potassium
what word describes substances that are unreactive?
Inert
Which is the only metal to exist in liquid state at normal temperature?
Mercury
When metal burns, it releases energy. What is the word that describe the reaction that releases energy?
Exothermic
When ice is added to the beaker, it melts as absorbing energy. What is the word that describes a reaction that absorbs energy?
Endothermic
When a piece of magnesium added to hydrochloric acid, it fizzes. What is this gas and salt made during this reaction?
hydrogen gas and magnesium chloride
Which metal is more reactive than magnesium?
a. calcium
b. copper
c. gold
d. silver
How many elements are there in the periodic table?
118
This element is used to paint the gate made of iron. What is this element, and what is this called?
"DOUBLE JEOPARDY"
zinc , galvanizing
what does it form when iron rusts?
What happens when two opposite poles are near each other?
What happens when two same poles are near each other?
Attraction ; Repel
what is an advantage of using an electromagnet compared to a bar magnet, a permanent magnet?
It can be turned off
What is the chemical symbol for table salt?
NaCl
you are experimenting with three different types of metal to find out which releases the most heat: calcium, magnesium, and iron with dilute hydrochloric acid. You are using the same volume of dilute hydrochloric acid for three different types of metals. Why?
To make it a fair test/ to control the variables.
What is the equation for rusting?
Iron + oxygen + water -> iron oxide
Draw a electromagnet with all proper labels
include:
- coil of wire
- iron rod (core)
- electric wire
- energy source - electric cell/battery cell
- switch
Pick the right elements that are metal.
A. Yello powder with a low melting point
B. Pink solid which conducts heat
C. Hard, grey magnetic solid
D. Silver coloured liquid at room temperature which conducts electricity
E. Orange liquid which does not conduct electricity
F. Colourless gas
B, C, D
Which metal is the best conductor of electricity?
Silver
Write four energy types that is produced during the chemical reaction between hydrogen and oxygen.
kinetic, thermal, sound, light energy
Write 3 examples of endothermic reaction
dissolving salt in water
Water evaporation
photosynthesis
cooking an egg
baking bread
sherbet sweets dissolving in mouth
What is the reaction called between metals and oxygen
oxidation reaction
Write three ways you can make the electromagnet stronger.
- increase number of turns on the coil
- use more cells to increase current
- use soft iron core
What steady flow of electrons in one direction is called?
Electric current