Chemistry - Ch#1 TEST

What is the SI unit of the temperature?

• Kelvin

• Celsius

• Fahrenheit

• Joule

What is the SI unit of the mass?

• mole

• gram

• kilogram

• pound

What is the kinetic energy of a car (m = 1.30 x 10³ kg) running at 100 km.hour^-1?

• 1.81 x 10⁴ J

• 5.02 x 10⁵ J

• 1.00 x 10⁶ J

• 5.02 x 10⁸ J

How many significant figures do you have in the number 0.0002030?

• 3

• 4

• 7

• 8

What is the result of this calculation: 0.236 x 3.658?

• 0.86

• 0.863

• 0.8632

• 0.8633

What is the conversion of 1 pm in meter?

• 10^-9 m

• 10^-10 m

• 10^-12 m

• 10^-15 m

What aspect of scientific measurement inherently includes uncertainty?

• Exact counts of item

• Measurments that involve estimation of decimals

• Conversion between metric units

• Stated definitions of units

When a chemist uses dimensional analysis to convert from grams to moles, which of the following principles is being applied?

• The scientific method

• The principle of uncertainty in measurment

• The mole concepts and molar mass conersion factor

• Caculated numerical results independent of units

Which scenario best illustrates a quantitative observation in the scientific method?

• Identifying the color of a chemical

• Inferring a chemical reaction has occured

• Measuring a compound's boiling point

• Predicting the outcome of an experiment

A chemist records the mass of a compound as 5.487 g, which includes known and estimated digits. What term best describes the 7 in this measurement?

• Accurate digit

• Significant figure

• Indeterminate number

• Metric unit