Question 1

What is the chemical composition of water?

Accepted Answer

Water is made of two hydrogen atoms and one oxygen atom. That's why its chemical formula is H2O. It's what makes drinks refreshing and helps things grow.

Question 2

Why do we call table salt 'sodium chloride'?

Accepted Answer

Table salt is made from two elements: sodium and chlorine. When they come together, they form sodium chloride. This is what makes our food taste salty!

Question 3

What is plastic made of?

Accepted Answer

Plastic is made from tiny units called polymers that come from oil or natural gas. These polymers are shaped into all kinds of things, like toys and bottles.

Question 4

Why do things rust?

Accepted Answer

Rust happens when iron gets wet and mixes with oxygen from the air. This makes a brown, crumbly substance called iron oxide, which is what we see as rust.

Question 5

What makes up a pencil 'lead'?

Accepted Answer

The 'lead' in pencils is not really lead; it's a mix of graphite and clay. Graphite is a type of carbon that lets you draw or write on paper.

Question 6

Why is glass transparent?

Accepted Answer

Glass is made from sand, melted down and cooled quickly. The way its particles are arranged allows light to pass through, making it see-through.

Question 7

What makes soap clean things?

Accepted Answer

Soap is made from fats and oils mixed with a substance called lye. Soap has special molecules that trap dirt and oils so water can wash them away.

Question 8

What are coins made of?

Accepted Answer

Today, most coins are made from metals like copper, nickel, and zinc. These metals are mixed together and stamped into the coins we use.

Question 9

What is chocolate made from?

Accepted Answer

Chocolate is made from cocoa beans, which grow on cacao trees. The beans are processed to get cocoa solids and cocoa butter, the main ingredients in chocolate.

Question 10

Why does bread rise?

Accepted Answer

Bread rises because of a substance called yeast. Yeast makes little bubbles of gas when it eats sugar, and these bubbles make the bread puff up as it bakes.

Question 11

What are rubber bands made of?

Accepted Answer

Rubber bands are made from rubber, which comes from the sap of rubber trees. The rubber is stretchy and comes in handy to hold things together.

Question 12

What makes up a battery?

Accepted Answer

Inside a battery, there are chemicals that create electricity. There are usually two parts: one makes electrons and the other takes them, creating a flow of energy.

Question 13

What are crayons made of?

Accepted Answer

Crayons are mostly made of a wax called paraffin, mixed with color pigments. The wax makes them smooth to draw with, and the colors make pictures bright.

Question 14

Why is honey sticky?

Accepted Answer

Honey is made by bees from flower nectar. The sugars in the nectar make it thick and sticky, perfect for bees to store and people to enjoy on toast.

Question 15

What makes up ice cream?

Accepted Answer

Ice cream is made of milk, sugar, and cream, mixed together and frozen. It's whipped while freezing to make it soft and fluffy.

Question 16

Why does soda fizz?

Accepted Answer

Soda fizzes because it contains carbon dioxide gas that's mixed under pressure. When you open the can or bottle, the gas escapes and forms bubbles.

Question 17

What is rubber made from?

Accepted Answer

Rubber is made from the sap of rubber trees, which is sticky when it comes out. The sap is processed to make it strong and stretchy.

Question 18

What are paper and cardboard made of?

Accepted Answer

Paper and cardboard are made from trees. The wood is ground up into pulp, and the pulp is spread out and dried to make flat sheets.

Question 19

Why are some metals shiny?

Accepted Answer

Metals are shiny because their smooth surface reflects light. This reflection is what makes them look bright and metallic.

Question 20

What makes cheese taste different?

Accepted Answer

Cheese is made from milk using bacteria that help it turn solid. Different cheeses use different bacteria and aging processes, giving them unique flavors.

The Chemical Composition of Everyday Objects - 20 FAQs Explained Simply