Chemistry- Exam 1 Chapter 1 and Chapter 2

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What is chemistry?

What is chemistry?

• the study of the composition, structure, and reactions of matter

• the study of matter

What is matter?

• another word for all the substances that make up our world

What are chemicals?

• substances that have the same composition and properties wherever found

  • ex. toothpaste is a combination of many chemicals

Which of the following contains chemicals? A. sunlight/ B. fruit/ C. milk/ or D. breakfast cereal (multiple choice)

• B, C, and D contain chemicals

Convert 2,400 to scientific notation

• 2.4 × 1000= 2.4 ×10 ³

Convert 0.00086 to scientific notation

• 0.00086= 8.6/ 10,000= 8.6 × 10^-4

How many kg= _____ grams?

• 1kg= 1000 grams

How many kg = _____ lbs?

• 1kg= 2.20lbs

How many grams equal ____ lb?

454 grams= 1 lb

How do you convert Celsius to Kelvin?

• add 273 to Celsius degrees to get Kelvin

What are the SI units for volume, mass, length, and temperature?

• volume= cubic meter/ m³

• mass= kilogram/ kg

• length= meter/ m

• kelvin= K

What are measured numbers?

• they are numbers obtained when you measure a quantity such as your height, weight, or temperature

How do you write a measure number?

• observe the numerical values of the marked lines

• estimate the value of the number between the marks

  • the estimated number is the final number in your measured number

What are significant figures?

• in a measured number, they are all the digits, including the estimated digit

• they are used to represent the amount of error associated with a measurement

• are all nonzero digits and zeros between digits

• are NOT zeros that act as placeholders before digits

• are zeros at the end of a decimal

How do you measure volume?

How do you measure mass?

What are equalities?

What are conversion factors for the equality?

What is density?

How to calculate density?