Gen Chem Review
Which of these Celsius temperatures is close to typical room temperature? 22* C 37° C 98° C 72° C
22° C
At what temperature on the Kelvin scale would you feel the most comfortable? 290K 90 K 390 K 190 K
290 K
How many kilograms (kg) is 378 decigrams (dg)
3.78x10^-2 kg
Which of the following numbers contains at least one zero that is not significant? 0.0700 11.10 100.0 0.2050 70.101
0.0700
Which of the following metric relationships is incorrect? 1 gram = 10^3 kilograms 10^3 milliliters = 1 liter 1 microliter = 10^-6 liters 10 decimeters = 1 meter 1 gram = 10^2 centigrams
1 gram = 10^3 kilograms
The solution to (20.40+0.390)*999/18.813 is 1.104E3 1103.98 1.1040E3 1.1E3 1.10E3
1.10E3
The sum of 20.40+0.390+999+78.600 is equal to: 1.09839E3 1.098390E3 1.0984E3 1.10E3 1.098E3
1.10E3
Convert 6.9 kg to lb (1kg=2.205lb)
15 lbs
Express the following number to 3 significant figures using proper scientific (exponential) notation 0.00023031
2.30x10^-4
A sample of unknown liquid boils at 168°F. What is the boiling point of the liquid in Celsius? In Kelvin?
75.6°C, 349 K
Which of the following is not a nanoscale object: A protein A sugar molecule A plant cell A xenon atom
A plant cell
Which of the following pairs of compounds can be used to illustrate the law of multiple proportions? NO and NO2 ZnO2 and ZnCl2 Ch4 and CO2 H2O and HCl NH4 and NH4Cl
NO and NO2
Which of the following are incorrectly paired? Palladium, Pd Lead, Pb Phosphorus, Pr Platinum, Pt Potassium, K
Phosphorus, Pr
Which of the following pairs can be used to illustrate the law of multiple proportions? H2SO4 and H2S CO and CaCO3 KCl and KClO2 H2O and C12H22O11 SO and SO2
SO and SO2
What is the name of the element having the symbol Ag?
Silver
Choose the statement that is quantitative: A chemical compound containing lead and sulfur forms shiny, plate-like, yellow crystals A chemical compound containing copper and oxygen is red The element potassium melts at 64°C Aluminum metal is a conductor of electricity
The element potassium melts at 64°C
The Greeks proposed that matter consisted of four fundamental substances
fire, earth, water, air
Alpha particles beamed at thin metal foil may:
pass directly through without changing direction, be slightly diverted by attraction to electrons, and be reflected by direct contact with nuclei
The degree of agreement among several measurements of the same quantity is called __________. It reflects the reproducibility of a given type of measurement.
precision
"What goes up must come down" is an example of a scientific
Law
The formula of water suggests: there are two oxygen atoms and one hydrogen atom per water molecule there are two hydrogen atoms and one oxygen atom per water molecule there is twice as much mass of oxygen as hydrogen in each molecule there is twice as much mass of hydrogen as oxygen in each molecule
there are two hydrogen atoms and one oxygen atom per water molecule
Which of the following lists both an element and a mixture? Tin and brass Solid and liquid mercury oxygen and ozone milk and water
tin and brass
Which of the following statements from Dalton's atomic theory do scientists no longer believe to be true, according to modern atomic theory: Atoms are indivisible in chemical reactions Atoms are not create or destroyed in chemical reactions All atoms of a given element are identical Elements are made up of tiny particles called atoms All of these statements are true according to modern atomic theory
All atoms of a given element are identical
Which of these is a qualitative statement: Carbon has six protons Nitrogen is found as a diatomic molecule Aluminum is a silvery-grey metal Water has a freezing point of 32°F
Aluminum is a silvery-grey metal
The first chemist to perform truly quantitative experiments was:
Boyle
Which pair of properties do all gases have? Compressible; fills container completely Good conductor of heat; takes shape of container Conducts electricity well; compressible Compressible; brittle
Compressible; fills container completely
In the early 1800's, the atomic theory of matter was proposed by:
Dalton
The first people to attempt to explain why chemical changes occur were: Metallurgists physicists alchemists physicians greeks
Greeks
Which of the following describes a gas? Having no fixed volume and can change shape easily Having a fixed volume but can change shape easily Having a fixed volume and cannot change shape easily Having no fixed volume but cannot change shape easily
Having no fixed volume and can change shape easily
What is the symbol for potassium
K
The scientist who discovered the law of conservation of mass and is also called the father of modern chemistry is:
Lavoisier
Which of these statements is true about protons and neutrons? They are unstable with respect to radioactive decay They have approximately the same mass They are found in the same region of space around the nucleus as the electron They each have a charge
They have approximately the same mass