Chemistry Basics

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Questions and Answers

What is the term for a mixture that has a uniform composition?

Pure substance

Compound

Heterogeneous mixture

Homogeneous mixture (correct)

What is the correct symbol for the element iron?

Fe (correct)

Which of the following states of matter is NOT significantly compressible?

Liquids

Gases

Solids (correct)

Plasma

A sample of osmium has a mass of 21.8 g and a density of 22.6 g/cm3. What is its volume?

0.965 cm3 Signup and view all the answers

What is the temperature in Celsius for a temperature of 302 K?

28.85 °C Signup and view all the answers

What is the term for how close a measured number is to the true value?

Accuracy Signup and view all the answers

What is the term for the number of digits in a measured value that are known to be reliable?

Significant figures Signup and view all the answers

What is the correct formula to convert temperature from Celsius to Kelvin?

T(K) = t(°C) + 273.15 Signup and view all the answers

What is the mass of a block of osmium that measures 1.01 cm × 0.233 cm × 0.648 cm, given its density is 22.6 g/cm³?

6.75 × 10−3 g Signup and view all the answers

How many significant figures are in the number 0.00430?

3 Signup and view all the answers

What is the result of the multiplication 6.3 × 3.25, reported to the proper number of significant figures?

20.5 Signup and view all the answers

An object accelerates from rest to a speed of 700 m/s in 2.75 min. What is its rate of acceleration in m/s²?

1.16 × 10⁵ Signup and view all the answers

What is the correct result of the addition 12 + 1.2 + 0.12 + 0.012, reported to the proper number of significant figures?

13 Signup and view all the answers

What is the physical state of matter that has a specific volume but no specific shape?

Liquid Signup and view all the answers

What is the symbol for the element lead?

Pb Signup and view all the answers

What is an example of a solution?

A small amount of salt dissolved in water Signup and view all the answers

What is the chemical symbol for elemental potassium?

K Signup and view all the answers

What is the SI unit of velocity?

m/s Signup and view all the answers

What is the unit of force in the SI system?

Newton Signup and view all the answers

What is the temperature of 25°C in Kelvin?

298 K Signup and view all the answers

What is the density of a sphere if it sinks in liquid mercury?

Less than 13.6 g/cm^3 Signup and view all the answers

What is the mass of a piece of silver with a volume of 23.6 cm^3 and density 10.5 of Mg/m3 ?

248 g Signup and view all the answers

What is the mass of 30.5 mL of a liquid with a density of 2.67 g/cm^3?

0.081 Kg Signup and view all the answers

What is the unit of momentum in the SI system?

kgm/s Signup and view all the answers

Study Notes

Mixture Types

A homogeneous mixture has uniform composition and properties throughout
A heterogeneous mixture has non-uniform composition and properties throughout
A compound has atoms of different elements chemically bonded together
A pure substance has a fixed composition and properties
Solid, liquid, and gas are states of matter

Element Symbols

The symbol for sodium is Na
The symbol for tin is Sn
The symbol for iron is Fe
The symbol for neon is N
The symbol for bromine is Br
The symbol for potassium is K
The symbol for lead is Pb

Physical Properties

Density is an intensive property that does not depend on the amount of substance
Temperature is an intensive property that does not depend on the amount of substance
Mass is an extensive property that depends on the amount of substance
Boiling point and freezing point are intensive properties that do not depend on the amount of substance
Accuracy refers to how close a measured number is to the true value
Precision refers to how close a measured number is to other measured numbers

Temperature Conversions

T(K) = t(°C) + 273.15
1 °C = 1.8 °F + 32
1 K = -272.15 °C

Density Calculations

Density = mass / volume
Volume of a cube = side length × side length × side length
Mass of a cube = density × volume

Unit Conversions

1 nanometer = 1000 picometers
1 kilogram = 1,000,000 milligrams
1 meter per second = 3.6 kilometers per hour

Other Concepts

Absolute zero is 0 K or -273.15 °C
Momentum is defined as the product of mass and velocity
The SI unit for force is the Newton, which is kg·m/s²
The SI unit for velocity is m/s

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Description

Test your knowledge of fundamental chemistry concepts, including mixtures, elements, and states of matter. Questions cover basic definitions, properties, and classifications.