Chem exam 1

Which of the following info is not included on MSDS (SDS)?

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?

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 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

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

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.

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

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

Which of the following statements are true? 1)density cannot be determined using the ideal gas equation. 2)the relationship between temp and vol is liner, when pressure is constant. 3)avogardo's law states that a mole of gas is 22.4 L at STP

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Chem exam 1

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