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2. Which of the following describes a chemical change?

What is the charge of a hydrogen atom?

The numerical value for standard pressure of any gas is

Whenever you have equal volumes of gases at the same temperature and pressure, the volume must

A homogenous mixture can be separated by all of the following methods except

Electrons occupy all the orbitals of a given subshell singly before pairing begins. These unpaired electrons have parallel spins. This is known as: a. Building Up Principle

Which of the following does not change with change in temperature?

A device used to measure density

If the volume of the mole of gas molecules remains constant, lowering the temperature will make the pressure

If a single reactant is transformed by heat or electricity into two or more products, the type of reaction is

It is considered as derivatives of ammonia in which one or more of the hydrogens have been replaced by the alkyl or aryl group. It is characterized by unpleasant odors

It is a colorless solid capable of being cut into brilliant crystals is the hardest, must abrasive mineral known

How many moles of are present in 44.8L of at STP?

Which of the following is a binary compound?

The statement “mass is neither created nor destroyed in a chemical reaction” is known as:

Term used to denote the technology of treating a mined ore to obtain a product higher on concentration of a wanted mineral from the unwanted rock mass in which it occurs.

What pressure must be applied to 225mL of gas at 1atm to reduce its volume to 100mL?

Three grams of sulphur dissolved in 200 g of naphthalene C10H8, was found decreasing the freezing point of the solvent to 0.72 ⁰C. Find the molecular weight of the solute. (Kf C10H8 = 6.9 ⁰C/molar)

The forces that hold atoms together are called