Chem final exam part 2

Elemental formula

A notation that uses the atomic symbol and sometimes a numerical subscript to denote how atoms are bonded in an element Elemental formula Chemical change Chemical properties Chemical bond

The number of times each element appears as a reactant and as a product the same

A. The purpose of coefficients in chemical equations is to make The number of molecules of reactants and products equal B. The number of times each element appears as a reactant and as a product the same C. All the subscripts within the chemical formula equal D. The equation balance by splitting the chemical formula

Chlorine

An atom of which of the following elements has the greatest ability to attract electrons? Chlorine Nitrogen Sulfur Silicon

Many more than 3 frequencies

An excited hydrogen atom is capable of emitting light of Only a single frequency Many more than 3 frequencies Up to 3 frequencies

Number of valance electrons

Atoms of elements in a group on the periodic table have similar chemical properties. This similarity is most closely related to the atom's Number of valance electrons Number of principal energy levels Atomic numbers Atomic masses

A new substance is formed when the vinegar reacts with the baking soda

Baking soda reacts with vinegar. In the reaction bubbles of carbon dioxide gas are formed. This is considered a chemical change because: A phase change takes place No new substances are formed when the vinegar reacts with the baking soda The vinegar changes its appearance A new substance is formed when the vinegar reacts with the baking soda

357

Convert 184 F to Kelvin (F=1.8 C+ 32; K= C+273) 273 189 84 184 357

Color of light

Each element when made to glow shows its own characteristic pattern of Molecular vibrations Light intensities Photons Color of light

82

Evaluate the following(4.1X105)(2.0X10-4) 8.2 8.2X10-20 82 0.82

Liquid to gas

Evaporation would be a phase change from: Liquid to gas Liquid to solid Solid to liquid Gas to liquid Solid to gas

The chemical identity of a substance is not altered during a physical change.

How is a physical change different from a chemical change? A. The physical properties of a substance are not altered during a chemical change. B. The chemical identity of a substance is not altered during a physical change. C. A physical change involves changes in chemical properties D. The chemical identity of a substance is altered during a physical change

4

How many covalent bonds can a carbon atom form? 1 2 8 5 4

One-quarter of the same materials remains

If a sample of radioactive material has a half life of 3 years, then at the end of 6 years. One-quarter of the same materials remains Half of the same materials remains All of the same materials remains The-ninth of the same materials remains

Shells

In the Bohr model of the hydrogen atom, discrete radii and energy states result when an electron circles the nucleus in an integral number of Spectral frequencies Wavelengths Shells

True

Neils Bohr invented and then popularized the planetary model of the atom True False

Decomposition

Potassium chlorate +heat --> Potassium chloride +Oxygen (2 KCl3---> 2 KCl+ 3 O2) is an example of Single Replacement Reaction Synthesis and Direct Combination reaction Double replacement Decomposition

Solid to gas

Sublimation would be a phase change from: Liquid to solid Gas to liquid Liquid to gas Solid to gas Solid to liquid

Argon

The element that has its first three shells filled to capacity, with none in the fourth shell, is Neon Argon Xenon Krypton

E= mc2

The equation that underlies energy released in nuclear fission and fusion is E= mb2 E= mc2 E= ma2

Nuclear fusion

The immense amount of energy released by the Sun is due to which of the following reactions occurring within its core? Nuclear fission Alpha decay Gamma decay Nuclear fusion

None of above

The phase in which atoms and molecules no longer move is the Gas phase Solid phase Liquid phase None of above

Velocity

The study of chemistry deals with all of the following EXCEPT Velocity Matter Changes in matter The energy changes that occur with matter

Chemistry

The study of matter and changes in matter best describes the science of: Physics Chemistry Microbiology Biology

Plasma

This state of matter naturally occurs on the surface of the sun. It consists of positively and negatively charged particles. Gas Liquid Solid Plasma

Number of times each element appears as a reactant is equal to the number of time it appears as a product

To say a chemical equation is balanced means the Number of times each element appears as a reactant is equal to the number of time it appears as a product Number of molecules of reactants and products are equal Subscripts on both sides of the reaction add up to the same number Coefficients on both sides of the reaction add up to the same number

Mass and Volume

Two items that distinguish matter are: Weight and Mass Weight and Volume Mass and Volume Mass and Velocity

Uranium

What atom has the most mass of these listed Uranium Iron All have the same mass Hydrogen

Volume

What does the instrument (Erlenmeyer flask) Mass Weight Volume

Volume

What does this instrument measure?(graduated cylinder) Volume Mass Weight

Mass

What does this instrument measure?(weigh) Volume Mass Weight

6

What is the total number of bonded electrons in NCl3 is: 8 6 13 10 9

Gain electrons and increase in size

When a metal atom combines with a nonmetal atom, the nonmetal atom will Lose electrons and increase in size Gain electrons and decrease in size Lose electrons and decease in size Gain electrons and increase in size

3121

Which four quantities are required to balance the equation? ___Fe2O3(s)+___C(s)--> ___Fe3O4(s)+___CO(g) 1315 3121 2131 5131

NO2

Which molecule has a Lewis structure that does not obey the octet rule? Cs2 NO2 N2O CCl4 PH3

Heat

Which of the following is NOT and example of matter Socks A remote Control A Telephone Heat

250.43 grams of sodium chloride

Which of the following is a quantitative measurement/observation 250.43 grams of sodium chloride The glass was cobalt blue Copper sulfate is a blue crystal The sulfur is yellow

F2(g)+FeI2(aq)-->FeF2(aq)+I2(l)

Which of the following reactions between halogens and halide salts will occur? Br2(l)+CoCl2(aq)-->CoBr2(aq)+Cl2(g) Cl2(s)+SrF2(aq)-->SrCl2(aq)+F2(g) I2(s)+MnBr2(aq)-->MnI2(aq)+Br2(g) F2(g)+FeI2(aq)-->FeF2(aq)+I2(l)

SrBr2

Which one of the compounds below is most likely to be ionic? CBr4 H2O GaAs NO2 SrBr2

SF4

Which one of the following compounds is most likely to be a covalent compound? CaCl2 Al2O3 CaSO4 SF4 KF

Cl and Mg

Which pair of elements would be most likely to form an ionic compound? Al and Mg Al and K C and S Cl and Mg Cl and I