At home assignment.

Which of the following is not true?

• A particular alloy of aluminum includes 1.5% manganese and 0.1% copper. This is an example of a homogenous mixture.

• Liquid propane, C3H8, is an example of a compound.

• Ozone gas, O3, is an example of an element.

• Gazpacho is a soup with extra chopped vegetables added to the blend of vegetables. This is an example of a homogenous mixture.

Which of the following is/are not true?

• A theory cannot be disproven even when there is a new observation that conflicts with the theory.

• A chemist mixes sodium with water and witnesses a violent reaction between the two. This is best classified as an observation.

• A law summarizes a series of related observations, while a theory attempts to explain why and predicts behavior beyond the current observation.

• A hundred years ago, Svante Arrhenius suggested that the presence of heat-absorbing gases in the atmosphere might increase the average temperature of the ground. This is an example of a observation.

How many significant figures does 0.0667728000?

Which of the following is consistent with Dalton's atomic theory?

• A single molecule of a compound can form from half an atom of boron and three atoms of fluorine.

• An atom of carbon cannot be changed into an atom of neon.

• An atom of oxygen and an atom of iron cannot have the same mass.

• An atom of gold can be destroyed in a chemical reaction.

Which of the following is not true?

• law of definite proportions applies to two or more samples of the same compound while the law of multiple proportions applies to two different compounds containing the same two elements (A & B)

• In a combustion reaction, 46.0 g of ethanol reacts with 96.0g of oxygen to produce water and carbon dioxide. If 54.0g of water are produced, then 88.0g of carbon dioxide must also be produced

• If two 100.0g samples of two different compounds consisting only of carbon an oxygen have a 27.2g of carbon in one and 42.9g of carbon in the other, these compound illustrate the law of multiple proportions.

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• Two samples of a compound containing elements A and B are decomposed. The first sample produces 30g of A and 70g of B. A second sample of this compound that produces 50g of A must produce 90g of B

Which of the following is true?

• Thomson discovered that cathode rays were streams of particles with no charge called neutrons

• Thomson measured the charge to mass ratio of the protons by deflecting the cathode ray with an electric field.

• Millikan’s oil drop experiment determined the amount of negative charge on an electron.

• In Rutherford’s gold foil experiment, all the alpha particles were deflected by the surface of the gold foil and bounced back towards the source.

Calculate the following to the correct number of significant figures:

4.562 x 3.99870 x (452.6755 – 452.33)

• 6.3

• 6.303

• 6

• 6.30

A ________ is a brief statement summarizing an observation and predicts future one.

A __________ is a Tentative interpretation or explanation of an observation. Falsifiable

A ______ explains why and how nature is.