Chemistry Quiz Prep

How many significant numbers are there in 0.000020

• 7

• 5

• 0

• 2

Answer explanation

0.000020 ONLY has 2 significant numbers as leading zeroes are NEVER significant and trailing zeroes are ONLY significant if there is a decimal present. - Tobi

1.0 x 10⁷ has how many significant figures?

• 7

• 2

• 4

• 1

Answer explanation

1.0 x 10⁷ has ONLY two significant figures as when calculating significant figures when in scientific notation you only look at the M value. (Fun fact even after converting it to standard form it will have the SAME amount of significant figures)

______ is how CLOSE a measurement is to its true or accepted value.

Answer explanation

Accuracy is how CLOSE a measurement is to its true or accepted value.

_______ how CLOSE measurements of the same item are to each other.

Answer explanation

Precision is how close measurements of the same item are to each other.

Accuracy and Precision are the SAME thing.

• True

• False

Answer explanation

Accuracy and Precision are INDEPENDENT of each other. (E.g. 3 Arrows can be close in proximity but completely miss the bullseye.)

Which correctly describes the image?

• Accurate & Not Precise

• Accurate & Precise

• Not Accurate & Precise

• Not Accurate & Not Precise

Answer explanation

The Image is both accurate and precise as the x-marks are very close to the bullseye and they are also very close together.

Which correctly describes the image?

• Accurate & Not Precise

• Accurate & Precise

• Not Accurate & Precise

• Not Accurate & Not Precise

Answer explanation

The image is precise but not accurate as while they are far from the bullseye they are still very close together.

Which correctly describes the image?

• Accurate & Not Precise

• Accurate & Precise

• Not Accurate & Precise

• Not Accurate & Not Precise

Answer explanation

The image is accurate but not precise as while they are close to the bullseye they are still far apart.

Which correctly describes the image?

• Accurate & Not Precise

• Accurate & Precise

• Not Accurate & Precise

• Not Accurate & Not Precise

Answer explanation

The image is not accurate and not precise as they are far from the bullseye as well as far apart.

There are ___ meters in a deka(da)meter

(Number form, no commas)