Which of the following is not a state of matter?

Which of the following phase changes represent deposition?

Which of the following forms of mixtures has only one phase?

It is a method of separating components of a solution by heating until the solvent is evaporated and collected through condensation.

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

Any given compound always contains exactly the same proportions of elements by mass. This law is known as

Through his work on cathode-ray tubes (CRTs), who discovered the electron?

Also known as the proton number, it is the number that uniquely identifies a chemical element.

Fluorine has an atomic number of 9 and a mass number of 19. How many electrons and how many neutrons does this atom have?

Which of the following nuclear families has the same number of nucleons but different atomic numbers?

Which nuclear family best characterizes the relationship between hydrogen to deuterium?

It is a mathematical function that describes the wave-like behavior of either one or a pair of electrons in an atom.

This states that no two electrons can have the same set of four quantum numbers.

Which of the following elements is not diatomic?

From the word meaning 'derived from experiment,' it is a chemical formula expressing the combination of elements in simplest whole-number ratio of their atoms.

It is the amount of substance that contains as many elementary entities (atoms, molecules, ions, etc.) as there are exactly 12 grams of the carbon-12 isotope. (OCT 2016)

It is the number of constituent particles, usually atoms or molecules that are contained in the amount of substance given by one mole. (APR 2018)

The formula for calcium nitrate is Ca(NO3)2. What is its approximate formula weight?

How many mole is 1kg of C2 H6 O2

A silicon chip used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many silicon (Si) atoms are present in the chip?

The number of oxygen atoms in 0.50 mole of Al2(CO3)3 is

In the atmosphere, nitrogen dioxide reacts with

water to produce nitric acid, which contributes to

pollution by acid rain:

How many grams of HNO3 are produced for every

1.0mol of NO2 that reacts? The molecular weight of

HNO3 is 63.0

How much oxygen is in 15g of carbon dioxide? (APR 2018)

A white powder is analyzed and found to contain 43.64% phosphorus and 56.36% oxygen by mass. What is the compound's empirical formula? (APR 2018)

It expresses the concentration of solutions as the number of moles of solute per volume of solution in liters.

Calculate the molar concentration of a solution that contains 15g of potassium hydroxide in 225ml of solution.

A bottle of certain ceramic tile cleanser, which essentially a solution of hydrogen chloride, contains 130g of HCl and 750g of water. What is the percent by mass of HCl in this cleanser?

It is a logarithmic value expressing the molar concentration of hydronium (H3O+) in an aqueous solution.

These are chemical species that accepts an electron pair to make a new covalent bond.

31. The pH of a sample of human blood was measured

to be 7.41 at 25°C. Calculate the concentration of

hydrogen ions in this blood sample.

When temperature of an ideal gas in a rigid container increases, the pressure increases because (APR 2017)

How many moles are there in 44.8 L of oxygen gas at STP?

A mixture of gases contains 4.46 moles of Ne, 0.74 mole of Ar and 2.15 moles of Xe. Calculate the partial pressure due to Xe if the total pressure is 2.00atm at a certain temperature.

How fast are the molecules of oxygen running into the sides of your body at a room temperature of 30°C?

Calculate the ratio of the rate of diffusion of hydrogen to the rate of diffusion of oxygen. How fast does hydrogen diffuse than oxygen? Given: Density of hydrogen is 0.0899 g/L and the density of oxygen is 1.43 g/L.

Which of the following radiation contains the heaviest particles?

Which particle does not affect the atomic number of an atom? (OCT 2015)

It is a form of the mineral uraninite occurring in brown or black pitch-like masses and containing uranium. (APR 2015)

It is the minimum amount of radioactive material needed to sustain a nuclear chain reaction.