Chemistry Study Guide Review 2015

Two Cubes of Aluminum Property Same or Different Material Mass Volume Density Same Different Same

Cube A is copper and Cube B is pine Property Same or Different Material Mass Volume Density Different Same Different

Cube A is copper and Cube B is pine Property Same or Different Material Mass Volume Density Different

Which is a pure substance and which is a mixture?   air:   helium:   oxygen:   CO 2 :   water:   chocolate milk:   sugar dissolved in water: mixture Pure substance- element Pure substance- compound Mixture

Identify which tool is used to measure each property:   mass:   length:   volume (liquid or irregular solid): Triple beam balance Ruler Graduated Cylinder

Draw a ball-and-stick model for each of the following compounds: H 2 O NH 4 FeO 2

Identify the units of the measuring tool. ToolUnits Triple Beam Balance Ruler Graduated Cylinder g cm mL OR cm 3

Given the chemical formula for sodium acetate (NaC 2 H 3 O 2 ), answer the following questions: a. How many molecules are present? b. What do the symbols represent? c. Identify the name for each symbol below. Na: _____________________ C: _____________________ H: _____________________ O: ______________________ 1 elements sodium carbon hydrogen oxygen

d. d. How many atoms of each element are there? d. d. If the formula was 3NaC 2 H 3 O 2, which of the above answers would change? Explain. Given the chemical formula for sodium acetate (NaC 2 H 3 O 2 ), answer the following questions: Sodium: Carbon Hydrogen: Oxygen: The # of Molecules AND the # of atoms of each element would be multiplied by 3

Identify each as a chemical or physical change.   rust forming on a railing:   sugar dissolving in water:   water evaporating:   wood burning: Chemical Change Physical Change Chemical Change

Two different objects are investigated by a group of students. They measured the mass and volume of each bar and recorded the results in the table below. ObjectMassVolume A120 g100 cm 3 B85 g100 cm 3 Calculate the density of each bar of soap. A: 1.2 g/cm 3 B: 0.85 g/cm 3

  Draw and label the positions of the objects in a container of water.   Explain why you drew each object in the position selected. A: 1.2 g/cm 3 B: 0.85 g/cm 3 Soap A is MORE dense than water so it FLOATS and Soap B is LESS dense than water so it SINKS.

You want to determine the density of a rectangular eraser. a. a. What two properties are used to determine density? b. b. Describe how you measure the properties identified in a. Identify any tools that would be used. a. a. Explain how the measurements you described in part b can be used to determine the density of the eraser. Mass & Volume Mass- TBB & Volume- ruler Mass/Volume = Density