Q: A student needs to convert 0.0250 meters to micrometers. What is the correct value?

$$2.50 \times 10^4$ micrometers

Question 1

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 2

A chemist measures the mass of a sample three times and gets values of 5.12 g, 5.13 g, and 5.11 g. The true mass is 5.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following best describes a systematic error?

Accepted Answer

It consistently skews measurements in the same direction.

Question 4

Which of the following is NOT one of the seven fundamental SI units?

Accepted Answer

Gram

Question 5

A student records a measurement as 0.004560 g. How many significant figures does this value have?

Accepted Answer

5

Question 6

Which metric prefix corresponds to $$10^{-6}$$?

Accepted Answer

Micro

Question 7

Which scientist's experiment provided the first evidence for the existence of a negatively charged particle within the atom?

Accepted Answer

J.J. Thomson

Question 8

Dalton's atomic theory stated that all atoms of a given element are identical. Which experiment challenged this idea?

Accepted Answer

Discovery of isotopes

Question 9

Which of the following best describes the main finding of Rutherford's gold foil experiment?

Accepted Answer

Atoms contain a small, dense, positively charged nucleus.

Question 10

A solution is prepared by mixing 10.0 g of NaCl with 90.0 g of water. Which property of the solution is extensive?

Accepted Answer

Mass

Question 11

Which of the following statements about precision and accuracy is correct?

Accepted Answer

Precision refers to how close measurements are to each other.

Question 12

If a measurement is reported as $$2.30 	imes 10^3$ m, how many significant figures does it have?

Accepted Answer

3

Question 13

Which of the following best explains why the discovery of the electron revised Dalton's atomic theory?

Accepted Answer

It showed that atoms contain smaller subatomic particles.

Question 14

A student needs to convert 0.0250 meters to micrometers. What is the correct value?

Accepted Answer

$$2.50 	imes 10^4$ micrometers

Question 15

Which of the following is a correct statement about Democritus's contribution to atomic theory?

Accepted Answer

He proposed that matter is composed of small, indivisible particles called atomos.

Question 16

A laboratory balance consistently reads 0.05 g higher than the true mass. What type of error is this?

Accepted Answer

Systematic error

Question 17

Which of the following best describes the main revision to Dalton's atomic theory after Rutherford's experiment?

Accepted Answer

Atoms contain a small, dense nucleus.

Question 18

Which of the following is the correct order of metric prefixes from largest to smallest?

Accepted Answer

Kilo, Centi, Milli, Micro, Nano

Question 19

Which experiment measured the charge of the electron?

Accepted Answer

Millikan's oil drop experiment

Question 20

A compound contains 2 atoms of hydrogen and 1 atom of oxygen. According to Dalton's atomic theory, what is the ratio of hydrogen to oxygen atoms in this compound?

Accepted Answer

2:1

Fundamental Concepts in General Chemistry: Properties, Measurement, and Atomic Theory

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