PPT: Nature of Matter: Elements, Compounds, and Mixtures | Science Curiosity Class 8 - New NCERT PDF Download

 Page 1


Nature of Matter: 
Elements, Compounds, and Mixtures
Page 2


Nature of Matter: 
Elements, Compounds, and Mixtures
What Are Mixtures?
Mixture
When two or more substances are mixed, where each substance retains its
properties, it is called a mixture.
Components
The individual substances that make up a mixture are called its components. The
components of a mixture do not react chemically with each other.
Page 3


Nature of Matter: 
Elements, Compounds, and Mixtures
What Are Mixtures?
Mixture
When two or more substances are mixed, where each substance retains its
properties, it is called a mixture.
Components
The individual substances that make up a mixture are called its components. The
components of a mixture do not react chemically with each other.
Heterogeneous Mixture
Mixtures where different components are generally
visible with the naked eye or with a magnifying device.
E x a m p l e s: Sprout salad with green gram, chickpeas,
onion, and tomato
Mixtures where components are evenly distributed and
cannot be distinguished, even with a microscope.
E x a m p l e s : Sugar dissolved in water, salt dissolved in
water
Homogeneous Mixture
Types of Mixture
Page 4


Nature of Matter: 
Elements, Compounds, and Mixtures
What Are Mixtures?
Mixture
When two or more substances are mixed, where each substance retains its
properties, it is called a mixture.
Components
The individual substances that make up a mixture are called its components. The
components of a mixture do not react chemically with each other.
Heterogeneous Mixture
Mixtures where different components are generally
visible with the naked eye or with a magnifying device.
E x a m p l e s: Sprout salad with green gram, chickpeas,
onion, and tomato
Mixtures where components are evenly distributed and
cannot be distinguished, even with a microscope.
E x a m p l e s : Sugar dissolved in water, salt dissolved in
water
Homogeneous Mixture
Types of Mixture E x a m p l e s
Mixture Type Examples Uniform or Non-uniform
Gas and gas Air Uniform
Gas and liquid Aerated water (soda water),
Oxygen dissolved in water
Uniform
Solid and gas Carbon particles in air Non-uniform
Liquid and liquid Acetic acid in water (vinegar), Oil
and water
Uniform, Non-uniform
Solid and liquid Sand and water, Seawater Non-uniform, Uniform
Solid and solid Baking powder, Alloys Uniform
Alloys like stainless steel, brass, and bronze are uniform mixtures of metals. Stainless steel contains iron,
nickel, chromium, and a small amount of carbon. Brass is a mixture of copper and zinc, while bronze is a
mixture of copper and tin.
Page 5


Nature of Matter: 
Elements, Compounds, and Mixtures
What Are Mixtures?
Mixture
When two or more substances are mixed, where each substance retains its
properties, it is called a mixture.
Components
The individual substances that make up a mixture are called its components. The
components of a mixture do not react chemically with each other.
Heterogeneous Mixture
Mixtures where different components are generally
visible with the naked eye or with a magnifying device.
E x a m p l e s: Sprout salad with green gram, chickpeas,
onion, and tomato
Mixtures where components are evenly distributed and
cannot be distinguished, even with a microscope.
E x a m p l e s : Sugar dissolved in water, salt dissolved in
water
Homogeneous Mixture
Types of Mixture E x a m p l e s
Mixture Type Examples Uniform or Non-uniform
Gas and gas Air Uniform
Gas and liquid Aerated water (soda water),
Oxygen dissolved in water
Uniform
Solid and gas Carbon particles in air Non-uniform
Liquid and liquid Acetic acid in water (vinegar), Oil
and water
Uniform, Non-uniform
Solid and liquid Sand and water, Seawater Non-uniform, Uniform
Solid and solid Baking powder, Alloys Uniform
Alloys like stainless steel, brass, and bronze are uniform mixtures of metals. Stainless steel contains iron,
nickel, chromium, and a small amount of carbon. Brass is a mixture of copper and zinc, while bronze is a
mixture of copper and tin.
Is air a mixture?
Air is a uniform mixture of mainly:
Nitrogen (78%)
Oxygen
Argon
Carbon dioxide
Water vapour
Besides these gases, air also contains dust
particles which are suspended in it. These dust
particles are not an integral part of the air and are
considered pollutants.