Compounds

Q.

Name all the 118 elements in the periodic table with their symbol, atomic mass and atomic number.

Q.

Difference between mixture and compound.

Q.

Who is known as the father of chemistry?

Q. What is the difference between atom and element?

Q.

What is the difference between molecular compound and ionic compound please explain it clearly.

Q. What is the difference between molecules and elements ?
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Q.

Give two examples of organic acid.

Q. difference between atom molecule element and compound

Q.

Which of the following is an element?

1. Water

2. Oxygen

3. Saltwater

Q.

What is the difference between elements and compounds

Q.

Which of the following is not an element?

1. Graphite

2. Germanium

3. Silica

4. Silicon

Q.

What are examples of anhydrous compounds?

Q.

What is the name for ${\mathrm{P}}_2{\mathrm{O}}_5$?

Q.

Which acid is present in grapes?

Q.

Define element, compound, and mixture with examples?

Q. Question 9
Two chemical species X and Y combine together to form a product P which contains both X and Y,
$X+Y\to P$, X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition

(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (iii) and (iv)

Q.

What are (i) Ionic compounds, and (ii) Molecular compounds?
Give two examples of each type of compounds.

Q. Why do we say that water is h2o and not oh2

Q.

Why is water considered a compound?

Q.

The smallest particle of an element or a compound that can exist on its own is called ______. (a molecule/an atom)

Q.

Write three characteristics of compounds.

Q. why do metals have lusture??

Q.

The electron configuration of phosphorus is 2, 8, 5 but the valency of phosphorus is 1- ..how?

Q. A sample of NH3 molecule irrespective of source contains 82.35% nitrogen and 17.65% hydrogen by mass. This data supports:

1. Law of definite proportions
2. Law of conservation of mass
3. Law of multiple proportions
4. Avogadro’s law

Q.

Is salt a pure substance ?

Q. Question 4 (b)
Explain the following giving examples.
b. Pure substance

Q.

Gases evolved during the thermal decomposition of mercuric nitrate $Hg(N{O}_3{)}_2$ are:

1. Nitrogen dioxide and oxygen

2. Nitrogen oxide and oxygen

3. Oxygen and nitrogen trioxide

4. Oxygen and nitrous oxide

Q.

Is diamond pure?

Q.

Identify the element which has 17 electrons and 17 protons?

Q.

Elements and compounds can be split into simpler substances.

1. True
2. False