Chemistry Trivia Quiz On Atoms And Molecules!
Are you looking for a chemistry trivia questions quiz on atoms and molecules? Atoms are building blocks of matter, and they join together to form molecules. They are made up of neutrons, protons, and electrons, which have a function to meet. A compound can be formed when molecules of different atoms are combines. See what else you know about these two by taking the quiz.
- 1.
If 92.6g of mercury reacts with 7.4g of oxygen then what will be the mass of mercuric oxide?
- A.
100g
- B.
92.4g
- C.
7.4g
- D.
7g
Correct Answer
A. 100gExplanation
92.6g=7.4g=100gRate this question:
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- 2.
If 8.4g of magnesium carbonate on heating gave 4.4g of carbon dioxide and 4.0g of magnesium oxide. These agreement are in agreement with______________
- A.
Law of constant proportion
- B.
Law of conservation of mass
- C.
Law of multiple proportion
- D.
Gay lussac's law
Correct Answer
B. Law of conservation of massExplanation
The given question involves the reaction between magnesium carbonate and heat, which results in the formation of carbon dioxide and magnesium oxide. According to the Law of Conservation of Mass, matter cannot be created or destroyed in a chemical reaction, it can only be rearranged. Therefore, the total mass of the reactants should be equal to the total mass of the products. In this case, the mass of magnesium carbonate (8.4g) is equal to the combined mass of carbon dioxide (4.4g) and magnesium oxide (4.0g), confirming the Law of Conservation of Mass.Rate this question:
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- 3.
Which of the following is one of the drawbacks of dalton's atomic theory?
- A.
Matter is made up of atoms
- B.
Atoms are indivisible
- C.
Atom is neither created nor destroyed
- D.
An element consists of only one type of atoms
Correct Answer
B. Atoms are indivisibleExplanation
As atoms are divisble - electrons protons and neutronsRate this question:
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- 4.
The molecular mass of ozone is
- A.
32 u
- B.
16 u
- C.
54 u
- D.
48 u
Correct Answer
D. 48 uExplanation
mass of O = 16 u mass of 0zone= 3 x 16 =48 uRate this question:
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- 5.
What is the symbol of sodium and copper?
- A.
N and C respectively
- B.
S and C respectively
- C.
Na and Cu respectively
- D.
Na and Co respectively
Correct Answer
C. Na and Cu respectivelyExplanation
Na =Natrium Cu= cuprumRate this question:
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- 6.
The number of atoms present in a molecule of a substance is
- A.
Molecularity
- B.
Atomicity
- C.
Valency
- D.
Reactivity
Correct Answer
B. AtomicityExplanation
The correct answer is atomicity. Atomicity refers to the number of atoms that are present in a molecule of a substance. It indicates how many atoms are chemically bonded together to form a molecule. Molecularity, on the other hand, refers to the number of molecules that participate in a chemical reaction. Valency is a measure of an atom's ability to form chemical bonds, while reactivity refers to how readily a substance undergoes a chemical reaction.Rate this question:
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- 7.
What is the valency of carbon in carbon dioxide
- A.
2
- B.
1
- C.
4
- D.
3
Correct Answer
C. 4Explanation
NUMBER OF ELECTRONS = 12 ELECTRONIC CONFIGURATION= 2,8,4 SO IT WILL REQUIRE 4 ELECTRONS TO BECOME STABLERate this question:
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- 8.
The atomic weight of nitrogen is 14. It means that
- A.
It is 14 times heavier than hydrogen atom d) None of the above Mass of Nitrogen is 14 gram
- B.
It is 14 times heavier than carbon-12 atom
- C.
It is of is grams
- D.
None of the above
Correct Answer
B. It is 14 times heavier than carbon-12 atomExplanation
ATOMIC MASS OF AN ATOM IS RELATIVE TO THE 1/12TH MASS OF CARBON - 12 ISOTOPERate this question:
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- 9.
Name the scientist who gave the atomic theory of matter
- A.
Albert Einstein
- B.
John Dalton
- C.
James Chadwick
- D.
Neils Bohr
Correct Answer
B. John DaltonExplanation
John Dalton is the correct answer because he is the scientist who gave the atomic theory of matter. Dalton's atomic theory, proposed in the early 19th century, stated that all matter is made up of tiny indivisible particles called atoms. He also suggested that atoms of different elements have different properties and combine in specific ratios to form compounds. Dalton's theory laid the foundation for modern atomic theory and revolutionized our understanding of the composition and behavior of matter.Rate this question:
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- 10.
Magnesium and oxygen combine in the ratio of 3:2 by mass to form magnesium oxide. What mass of oxygen gas would be required to react completely with 24 grams of magnesium?
- A.
16 g b) 45 g c) 12 g d) 19 g 16g
- B.
45 g
- C.
12 g
- D.
19 g
Correct Answer
A. 16 g b) 45 g c) 12 g d) 19 g 16gExplanation
MASS OF Mg = 24 G 3x = 24 x = 24/3 x= 8 HENCE 2 X x = 2 X 8 = 16 GRate this question:
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- 11.
The smallest atom of all is _________.
- A.
C
- B.
H
- C.
Cu
- D.
Na
Correct Answer
B. HExplanation
The smallest atom of all is H (hydrogen). Hydrogen is the lightest and simplest element in the periodic table, consisting of only one proton and one electron. It has the smallest atomic radius among all the elements, making it the smallest atom.Rate this question:
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- 12.
The value of Avogadro number is _______________.
- A.
9.022 x 10^23 ( ^ = THESE SYMBOL INDICATES TO THE POWER )
- B.
6.022 X 10^23
- C.
12.44 X 10^23
- D.
3.011 X 10^23
Correct Answer
B. 6.022 X 10^23Explanation
The Avogadro number is a fundamental constant in chemistry and physics that represents the number of atoms or molecules in one mole of a substance. It is approximately equal to 6.022 x 10^23, which means that there are 6.022 x 10^23 atoms or molecules in one mole of any substance. This value is widely used in various calculations and conversions in chemistry, such as determining the number of atoms in a sample or calculating the molar mass of a compound.Rate this question:
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- 13.
1 mole = ___________ mass of element.
- A.
Kilogram
- B.
Metre
- C.
Gram atomic
- D.
None of this these
Correct Answer
C. Gram atomicExplanation
The correct answer is "Gram atomic." This is because one mole is defined as the amount of substance that contains the same number of particles (atoms, molecules, ions, etc.) as there are atoms in exactly 12 grams of carbon-12. Therefore, one mole is equal to the gram atomic mass of an element, which is the mass of one mole of atoms of that element in grams.Rate this question:
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- 14.
What is the valency of nitrogen in ammonia (NH3 )
- A.
3
- B.
4
- C.
2
- D.
1
Correct Answer
A. 3Explanation
The valency of nitrogen in ammonia (NH3) is 3. This is because nitrogen has 5 valence electrons, and it needs 3 more electrons to complete its octet. In ammonia, nitrogen forms three covalent bonds with three hydrogen atoms, sharing its 3 valence electrons with them. Therefore, the valency of nitrogen in ammonia is 3.Rate this question:
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- 15.
What is the formula of lithium nitride
- A.
LiN
- B.
(LI2)3 N
- C.
Li2N
- D.
Li3N
Correct Answer
D. Li3NExplanation
The correct answer is Li3N. Lithium nitride is composed of one lithium ion (Li+) and one nitride ion (N3-). Therefore, the formula for lithium nitride is Li3N, indicating that three lithium ions combine with one nitride ion to form the compound.Rate this question:
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Mar 22, 2023Quiz Edited by
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Feb 12, 2016Quiz Created by
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