Chemistry Unit 1 Branches of Chemistry Periodic Table

Chemistry Unit 1

Branches of Chemistry/ Periodic Table Metric Conversion/ Density Accuracy Precision and Error Physical and Chemical Properties/ Changes Matter 10 10 10 20 20 20 30 30 30 40 40 40 50 50 50

Question 1 - 10 • What are the vertical columns on the periodic table called?

Answer 1 – 10 • Groups/Families

Question 1 - 20 • What is the name for the branch of chemistry that focuses on the study of carbon compounds?

Answer 1 – 20 • Organic Chemistry

Question 1 - 30 • How many periods are on the Periodic Table?

Answer 1 – 30 • 7 Periods

Question 1 - 40 What are the names of the following elements? • Na • K • W • As

Answer 1 – 40 Na → Sodium K → Potassium W → Tungsten As → Arsenic

Question 1 - 50 • What are the horizontal rows on the periodic table called?

Answer 1 – 50 • Periods

Question 2 - 10 • How many grams are in 250 mg?

Answer 2 – 10 • 0. 250 g

Question 2 - 20 • How many m. L are in 1 k. L?

Answer 2 – 20 • 1, 000 m. L

Question 2 - 30 • What is the density of an object that has a mass of 15 g and a volume of 7. 5 m. L?

Answer 2 – 30 • 2 g/m. L

Question 2 - 40 • What is the volume of an object that has a mass of 25 g and a density of 50 g/m. L?

Answer 2 – 40 0. 5 m. L

Question 2 - 50 The density of tin is 15. 65 g/cm. What is the mass of a block of tin that measures 2. 00 cm x 8. 00 cm x 4. 50 cm?

Answer 2 – 50 • 1, 126. 8 g

Question 3 - 10 • Draw a target to show measurements that are precise but not accurate.

Answer 3 – 10

Question 3 - 20 • Define accuracy.

Answer 3 – 20 • A measure of how clue a measurement is to the “true” value.

Question 3 - 30 • A student measure the mass of an object to be 2. 54 g. The true mass of the object is 2. 97 g. Calculate the student’s percent error?

Answer 3 – 30 • 14. 49 %

Question 3 - 40 • A student makes 5 measurements for the length of an object. The measurements are 2 cm, 2. 3 cm, 1. 9 cm, 2. 1 cm, and 2 cm. The actual length of the object is 2 cm. Describe the student’s accuracy and precision.

Answer 3 – 40 • The student is both precise (the measurements are close together) and accurate (the measurements are close to the true value).

Question 3 - 50 • Define precision.

Answer 3 – 50 • A measure of how close a set of measurements are to one another.

Question 4 - 10 List a physical property of the object shown below.

Answer 4 – 10 Liquid Shiny Pourable etc.

Question 4 - 20 • Is burning paper a physical or chemical change? Explain your choice.

Answer 4 – 20 • Chemical change because a new substance is being created.

Question 4 - 30 Which of the following is a chemical property? • Freezing point • Melting point • Hardness • Ability to react with water

Answer 4 – 30 • Ability to react with water.

Question 4 - 40 Which of the following is a chemical change? • Ripping paper • Freezing water • Cooking food • Melting ice

Answer 4 – 40 • Cooking food

Question 4 - 50 • Define intensive and extensive properties.

Answer 4 – 50 Intensive property → Depends on the type of matter Extensive property → Depends on the amount of matter

Question 5 - 10 • Define heterogeneous mixture and give one example.

Answer 5 – 10 A combination of two or more substances that does not have a uniform composition. Example: Chicken soup Salad Oil and Water

Question 5 - 20 • Define homogenous mixture and give one example.

Answer 5 – 20 A combination of two or more substances that has a uniform composition. Example: Salt water Koolaid

Question 5 - 30 • In how many physical states does water commonly exist? List and describe the phases.

Answer 5 – 30 3 Solid → Ice Liquid → Water Gas → Water Vapor

Question 5 - 40 • What is another name for a homogeneous mixture?

Answer 5 – 40 • Solution

Question 5 - 50 • Draw the Phase Change Diagram for water and label the processes happening at the plateaus (flat portions).

Answer 5 – 50