Is matter Around us pure - 02

Air is regarded as mixture because?

• It's pressure may vary.

• It's temperature may vary.

• Volume changes under different compositions.

• It's compositions may vary.

Tags

NGSS.MS-ESS2-6

NGSS.MS-ESS2-5

In which of the following constituents are present in the fixed ratio?

• Mixture.

• Compound.

• Solution.

• Colloid.

Brass is an example of?

• Homogeneous compound.

• Homogeneous mixture.

• Heterogeneous mixture.

• Heterogeneous compound.

When two liquids do not mix, they form two separate layers and are known as

• (a) Miscible liquids

• (b) Immiscible liquids

• (c) Saturated liquids

• (d) Super saturated liquids

brass is an alloy. It is a mixture of______

• 30% Zinc 70% copper

• 20% copper 80% nickel

• 40% iron 80% copper

• 35% gold 65% zinc

What is an element?

• A pure substance that cannot be broken down.

• Two atoms bonded together.

• Two or more different types of atoms bonded together.

• An molecule with an unequal distribution of charge.

What are atoms composed of?

• Protons and electrons.

• Protons, neutrons, and electrons.

• Neutrons and electrons.

• Ions, elements, and compounds.

Tags

NGSS.MS-PS1-1

How many H atoms are in water?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Blood and sea water are

• Blood is a mixture whereas sea water is a compound

• Blood is a compound and sea water is a mixture

• Both are mixtures

• Both are Compounds

Define a pure substance?

• A pure substance consists of a single type of particles and constant composition.

• A pure substance consists of two different types of particles with variable composition

• A pure substance consists of many types of particles and different composition