Chem exam 1
Which of the following info is not included on MSDS (SDS)?
Flammability
Chemical composition
Disposal instructions
Experiment procedures
Health hazards
Which question is NOT a testable question?
Do tomatoes have more vitamin c than apples?
What happens to your blood glucose level if you do not eat lunch?
Why do people smoke cigarettes?
Which planet is the largest?
Which objects are attracted by a magnet: a metal paper clip, copper penny or aluminum foil?
What is the purpose of a controlled variable?
To determine the effect of a new variable of a new variable on a system
To control the temperature of the experiment
To alter a system in an unknown way
To include a variable that could influence experimental results, but is not related to the hypothesized change
To influence a system in a predetermined way
Which of the following terms refers to how close an experimental result comes to the correct value?
Accuracy
Precision
Constant
Percent yield
Experimental error
The atomic number is
The number of protons plus the number of neutrons in the atom
Equal to the number of electrons plus the protons in the atom
Equal to the number of protons in the atom
Always less than the number of electrons in the atom
Equal to the number of neutrons in the atom
Which of the following regarding atomic symbols is not true?
Au is gold
Cl is chlorine
Ba is barium
S is sodium
All are true
Which of the following statements are correct? 1)the total mass of all the substances involved in a reaction must be the same before and after the reaction. 2)the experiments done in Rutherford's lab on gold foil showed that most of the mass of an atom is concentrated in a very small volume. 3)the relative mass of a proton, neutron and electron are all the same
1
2
1 and 2
2 and 3
All are correct
Elements in the same column of the periodic table in the groups labeled A tend to have similar chemical and physical properties because they all have the same number of
Total electrons
Protons plus neutrons
Valence electrons
Protons
Core electrons
A substance that can be broken down into two or more simpler substances by chemical methods is called a(n)
Ion
Mole
Mixutre
Element
Compound
Which of the following statements is NOT true? 1)the total number of protons in chlorine is 35. 2)boron would have a larger electronegativity than carbon. 3)in the series Si,Ge,Sn,Pb, lead (Pb) has the largest atomic radius.
1 and 2
1 and 3
2 and 3
1, 2, and 3
3
Which of the following is a chemical change?
Iron oxide is red
Ethanol is less dense than water
Mercury oxide decomposes into mercury and oxygen gas
Ionic compounds melt at an extremely high temperatures
None of the above
Calculate the molecular mass of calcium chloride (CaCl2)
6.05 moles
3.15 moles
1.65 moles
3.30 moles
1.21 moles
What effect would a decrease in volume have on pressure assuming that temperature and moles of gas are kept constant, according to boyle's law?
Pressure would decrease
Pressure would increase
Pressure would increase first then eventually decrease
Pressure would stay the same regardless of a change in volume
Not able to determine with the above information
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