CHAPTER 2 ( SCIENCE ) : Element & Compound search

Question 1

Which element was first discovered on the sun?

Answer 1

Helium

Question 2

Which element is solid at 27°C but would melt on a hot day?

Answer 2

Gallium

Question 3

Which compound is used to make a chalk that can be used on blackboards? What is the chemical formula of this compound?

Answer 3

Calcium Carbonate. Its chemical formula is CaCO3

Question 4

Which element can be found in toothpaste?

Answer 4

Fluorine

Question 5

Greenhouse gases are responsible for global warming and climate change, 3% of Greenhouse gases are made up of fluorinated gases. The remaining 97% are made out of three infamous compounds and what are their chemical formulas?

Answer 5

Carbon dioxide CO2, Methane CH4, Ozone O3

Question 6

What is the compound that can be found in baking soda? What is the chemical formula of this compound?

Answer 6

Sodium bicarbonate (NaHCO3)

Question 7

What element is the only metal to exist in liquid form? Give one use of this element.

Answer 7

Mercury. Used in thermometer to check temperature.

Question 8

Mothballs are a kind of pesticide that we keep in our wardrobe to protect our clothing from being eaten up by moths and bugs. What compound can be found in mothballs?

Answer 8

Naphthalene

Question 9

Which element can be found in swimming pools? Why can it be found there?

Answer 9

Chlorine. Its found in there because it will help to kill all the bacterias and germs.