Chemistry Trivia Quiz On Atoms And Molecules!

Na =Natrium Cu= cuprum

1 mole of any substance contains Avogadro's number of entities, which is 6.022 × 10²³. This number represents the quantity of atoms, molecules, ions, or other particles present in one mole of any substance.

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.

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.

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.

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.

To determine the mass of mercuric oxide produced, we can apply the Law of Conservation of Mass, which states that the mass of the reactants equals the mass of the products. In this case, the reactants are mercury (Hg) and oxygen (O₂), and the product is mercuric oxide (HgO).

Given:

Mass of mercury (Hg): 92.6 g

Mass of oxygen (O₂): 7.4 g

To Find:

Mass of mercuric oxide (HgO)

Solution:

According to the Law of Conservation of Mass,

Mass of HgO=Mass of Hg+Mass of O2​

Mass of HgO=92.6g+7.4g

Mass of HgO=100.0g

Therefore, the mass of mercuric oxide produced will be 100.0 g.

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.

MASS OF Mg = 24 G 3x = 24 x = 24/3 x= 8 HENCE 2 X x = 2 X 8 = 16 G

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.

In carbon dioxide (CO₂), carbon forms two double bonds, one with each of the two oxygen atoms. Each double bond involves sharing two pairs of electrons, giving carbon a total of four shared electrons and thus a valency of 4 in carbon dioxide.

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.

A hydrogen atom has a mass of 1 amu, and a nitrogen atom has a mass of 14 amu, so a nitrogen atom is 14 times heavier than a hydrogen atom.

mass of O = 16 u mass of 0zone= 3 x 16 =48 u

Dalton's atomic theory stated that atoms are indivisible, meaning they cannot be broken down into smaller particles. However, later scientific advancements showed that atoms consist of subatomic particles (protons, neutrons, and electrons), proving that atoms can indeed be divided. Thus, the idea that atoms are indivisible is a drawback of Dalton's atomic theory.