What are the different types of chemical changes?

Answer 1

Physical Change:

*Milo dissolves into hot milk

*A plate is dropped and shatters

*Grass in mowed

*Metal Knife is sharpened

*Breakfast Cereal goes soggy

Chemical Change:

*Wood burns to form black charcoal

* A green tomato ripens and turns red

* Fireworks explode to form colourful light and loud sounds

* Vegetables scraps in the compost bin decompose to form rich soil

* An egg is cooked to become a white and yellow solid

Answer 2

Physical change-1.tearing paper

2.melting of water

3.evaporaion of water

4.freezing of water

5.chopping of veggies or fruits

6.cutting wood

7.glowing of bulb

8.crushing a can

9.breaking a vase

10.mixing water and oil

Chemical change-1.burning of paper

2.cooking

3.rotting

4.fireworks

5.baking

6.digestion

7.milk turning sour

8.curdling of milk

9.rusting of iron

10.lightning

Answer 3

Chemical changes include reactions like oxidation, decomposition, and combination. Oxidation involves the addition of oxygen or loss of electrons. Decomposition breaks down a compound into simpler substances. Combination reactions combine two or more substances to form a new compound.

Answer 4

There are several examples of chemical changes. Ten are the rusting of iron, burning of wood, metabolism of food, mixing an acid and a base, cooking an egg, mixing baking soda and vinegar, digesting sugar, baking a cake, electroplating a metal, and using a chemical battery.

Answer 5

Combustion:

Rapid combination of a fuel with oxygen; produces heat, light, and new substances. Examples are Gas, Oil, or coal burning in a furnace

Electrolysis:

Use of electricity to break a compound into elements or simpler compounds. Examples are breaking down water into hydrogen and oxygen.

Oxidation:

Slow combination of a substance with oxygen. Examples are rusting of an iron fence.

Tarnishing:

Slow combination of a bright metal with sulfur or another substance, producing a dark coating on the metal. Example is tarnishing of brass.

Answer 6

Hydrogen and oxygen react to give water.

2H2(g) + O2(g) -----> 2H2O(g)

Sodium hydroxide and hydrochloric acid neutralize each other.

NaOH(aq) + HCl(aq) -----> NaCl(aq) + H2O(l)

Sodium reduces water.

2Na(s) + 2H2O(l) -----> 2NaOH(aq) + H2(g)

Sodium chloride and silver nitrate undergo double displacement.

NaCl(aq) + AgNO3(aq) -----> NaNO3(aq) + AgCl(s)

Mercury(II) oxide decomposes to elements.

2HgO(s) -----> 2Hg(l) + O2(g)

Copper(II) is reduced by zinc metal.

CuSO4(aq) + Zn(s) -----> ZnSO4(aq) + Cu(s).

Methane combusts in oxygen.

CH4(g) + 2O2(g) -----> CO2(g) + 2H2O(g)

Sulfur trioxide reacts with water.

SO3(g) + H2O(l) -----> H2SO4(l)

Quicklime reacts with water.

CaO(s) + H2O(l) -----> Ca(OH)2(s)

Calcium carbonate decomposes.

CaCO3(s) -----> CaO(s) + H2O(g)

Answer 7

The three main types of chemical changes are inorganic, organic and biochemical changes. Chemical changes occur when a substance combines with another to form a new substance.

Answer 8

a) change in color

b) production of gas

c) formation of a percipitate

Answer 9

by cutting the fruits

Answer 10

Temperature, solid, color, gas