Tag: look, learn and experience

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Questions Related to look, learn and experience

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Classify which of the following pair is a compound and a mixture?

  1. Air, ocean water

  2. Water, glucose

  3. Glucose, Salt

  4. Water, air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the above examples, water is a compound and air is mixture. Water consists of oxygen and hydrogen chemically combined whereas air is a mixture which consists of oxygen, nitrogen and other gases which are only physically combined.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Define element.

  1. Can be broken down by chemical reactions into simpler substances

  2. Cannot be broken down by chemical reactions into simpler substances

  3. Maybe be broken down by chemical reactions into simpler substances

  4. Both b and c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as an element. An element is homogeneous in nature; it is a pure substance, made up of only one kind of atoms. For example, iron and silver are made of only iron and silver atoms.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Identify the compounds among the following:


(a) Milk (b) Sodium (c) Calcium Carbonate (d) Methane

  1. Milk, Calcium carbonate

  2. Sodium

  3. Calcium carbonate, Methane

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Compounds is a pure substance made up of two or more elements combined chemically in a definite (or constant) proportion by mass.


Calcium carbonate is $CaCO _3$, Methane is $CH _4$ --- Compound.

Sodium ----- Element.

Milk ---------- Mixture.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following is a compound?

  1. Baking soda

  2. Octane

  3. Hydrogen peroxide

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrogen peroxide is formed when two atoms of hydrogen form a bond with two atoms of oxygen that have bonded to each other. Octane is a hydrocarbon consisting of hydrogen and carbon. Sodium bicarbonate (baking soda) can be produced from the reaction of carbon dioxide with an aqueous solution of sodium hydroxide, which creates sodium carbonate; it is then combined with carbon dioxide molecules to produce sodium bicarbonate. All the compounds are made up of different elements and have properties different from their constituent element.