Chemistry regents review

transmutation

A change in the nucleus of an atom that converts the atom from one element to another element is called

28.56 days

Based on Table N, determine the time required for an original 100.-milligram sample of P-32 to decay until only 25 milligrams of the sample remain unchanged.

The nitrogen gas has more mass.

Compare the mass of the gas in cylinder A to the mass of the gas in cylinder B.

Silicon-30

Complete the equation in your answer booklet for the decay of phosphorus-30 by writing a notation for the missing product.

The equilibrium shifts to the left, and the concentration of Ba2(aq) decreases.

Given the equation representing a solution equilibrium: BaSO4(s) H2O Ba2(aq) SO42(aq) What occurs when Na2SO4(s) is added to this system, increasing the concentration of SO42(aq)?

C3H6

Given the formula of a compound: H H C CH C H H H What is the molecular formula for this compound?

2

Given the potential energy diagram representing a reaction: 3 (reactant/top) y g Potential Ener 2 (product/reactant) 4 (reactant/bottom) P 1 (product/bottom) Reaction Coordinate Which numbered interval represents the heat of reaction?

Carbon

Identify the element in C6H12O6 that allows it to be classified as an organic compound.

4.25%(33.968) + .75%(32.971) + 94.99%(31.972) + .01%(35.967)

In the space in your answer booklet, show a numerical setup for calculating the atomic mass of sulfur.

lower energy and greater randomness

Systems in nature tend to undergo changes toward

H-O

The bond between which two atoms is most polar?

metalloid

The element in Group 14, Period 3, of the Periodic Table is classified as a

Na2C2O4

What is the chemical formula for sodium oxalate?

anode in both types of cells

When comparing voltaic cells to electrolytic cells, oxidation occurs at the

2-7-2

Which electron confi guration could represent the electrons in a sodium atom in an excited state?

cesium

Which element has chemical properties that are most similar to potassium?

2Al(s) 6HCl(aq) → 2AlCl3(aq) 3H2(g)

Which equation represents a single replacement reaction?

2I- → I2 2e-

Which equation represents conservation of charge?

chemical

Which form of energy is converted to electrical energy in a voltaic cell?

the electrons in the fourth shell

Which part of a calcium atom in the ground state a different number of protons but the same is represented by the dots in its Lewis electron-number of neutrons dot diagram?

oxidation

Which process can be represented by a half-reaction equation?

Energy is released as a bond is formed

Which statement describes the energy and bonding changes as two atoms of fl uorine become a molecule of fluorine?

aluminum

Which substance can not be broken down by chemical means?

hydrogen bonding

Which term identifies a type of intermolecular force?

saponification and fermentation

Which terms represent two types of organic reactions?

(240.0 g - 224.2 g) X 100/16.4 g

Show a numerical setup for calculating the percent by mass of NaCl in the rock salt sample.

(500 mL)(273 K)/298 K

Show a numerical setup for calculating the volume of the gas in cylinder B at STP.