Tag: study of matter

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

Water is a  _______ made up of hydrogen and oxygen combined in the ratio ______ by volume or _______ by mass.

  1. compound, 3:2, 1:1 respectively

  2. element, 1:2, 3:1 respectively

  3. compound, 2:1, 1:8 respectively

  4. molecule, 1:1, 1:16 respectively
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is a chemical compound made up of hydrogen and oxygen combined in the ratio $2:1$ by volume or $1:8$ by mass (2 g of hydrogen combines with 16 g of oxygen).

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

The lightest and the most abundant element in the universe is:

  1. zinc

  2. hydrogen

  3. sodium

  4. mercury
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The lightest and the most abundant element in the universe is hydrogen. The percentage of hydrogen in the universe is more than $91$%.


Therefore, hydrogen is the most abundant element in the universe.

Hence, option B is correct.

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

Statement 1 : Iron is an element.


Statement 2 : It cannot be broken into smaller units and retain its physical and chemical properties.

  1. <p>

    </p><p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct
    </p>

  4. Statement 1 is not correct but Statement 2 is correct

  5. <p>Both the Statement 1 and Statement 2 are not correct</p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Iron is an element found in nature as the third most abundant element in the earth's crust.


Element is a pure substance with a single element and cannot be further divided into its constituent elements.

Hence the correct option is A.

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

True or False.


Baking soda is a compound.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Baking soda is a compound because it's composed of molecules that are all identical. It has the chemical formula $NaHCO _3$ and the chemical name sodium hydrogen carbonate. Pure baking soda is a compound, NaHCO3. But in most cases the white powder will be a mixture between $NaHCO _3$ and $Na _2CO _3$, which resulted after the decomposition of $NaHCO _3$:

$2NaHCO _3 \rightarrow  Na _2CO _3 + CO _2 + H _2O$

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

In an experiment oxygen was added to hydrogen and heated. On burning a substance containing both oxygen and hydrogen water was formed. What is this substance?

  1. Element

  2. Compound

  3. Solution

  4. Mixture
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxygen and hydrogen are two elements and when they react they must generate another compound. Their product is not a mixture and  their result is a different compound with different properties.