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