Some Basic Concepts of Chemistry

Which chemical fiber, also known as 'Dacron', is used in making crease-resistant fabrics?

Which thermosetting polymer is used to make electrical switches and handles of kitchen utensils?

Chemistry plays a vital role in the production of steel, which is an alloy of which primary metal?

In a chemical reaction, the total mass of the reactants is equal to the total mass of the products. This is known as:

Which of the following elements is a non-metal?

Which statement about the particles of matter is FALSE?

Which law was validated by the experiment involving the reaction of hydrogen and oxygen to form water vapor in a 2:1 volume ratio?

The Law of Conservation of Mass was originally called the Law of Indestructibility of Matter. Which of the following best describes it?

Pure water consists of $11.11\%$ hydrogen and $88.89\%$ oxygen by mass. This is true for water from any source. This supports:

According to Dalton, an atom of Oxygen is different from an atom of Nitrogen primarily because of its:

Which of the following is a key feature of atoms as described by Dalton?

According to Dalton, all matter—whether an element, a compound, or a mixture—is composed of:

What is the molecular mass of Phosphoric acid ($H_{3}PO_{4}$)? (Atomic masses: $H = 1.0\ u, P = 31.0\ u, O = 16.0\ u$)

Determine the formula mass of Potassium Carbonate ($K_{2}CO_{3}$). (Atomic masses: $K = 39.0\ u, C = 12.0\ u, O = 16.0\ u$)

What is the atomic mass of Calcium ($Ca$)?

Which of the following is equal to the Avogadro constant?

Calculate the molar mass of Nitric Acid ($HNO_{3}$). ($H = 1, N = 14, O = 16$)

How many moles of $O_{2}$ contain $1.2044 \times 10^{24}$ molecules?

If a compound has a molar mass of $100$ g/mol and contains $40$ g of element $X$, what is the mass percentage of $X$?

What is the mass percentage of Oxygen in acetic acid ($CH_3COOH$)? (Molar mass = $60$ g/mol, $O = 16$)

What is the mass percentage of Hydrogen in acetic acid ($CH_3COOH$)? (Molar mass = $60$ g/mol, $H = 1$)

How many grams of $CO_2$ are contained in 11.2 L of the gas at STP (1 atm)?

The ratio of the mass of a product obtained to the mass expected from the balanced equation is related to:

What is the molarity of a solution containing 4 g of $NaOH$ in 1 L of solution?