Measuring Physical Properties

NAME:______Block ______No:______Measuring physical properties Calculating density of liquids Gps: Scsh2: students will use standard safety practices for all classroom laboratory and field investigations. Scsh4: students will use tools and instruments for observing, measuring, and manipulating scientific equiipment and materials. ** we will be solving density problems using lab data, graphing the data and interpretating the data. Safety: students must wear goggles, apron, and closed toed shoes at all times in the lab. Long hair should be tied back securely and long sleeves rolled up.

Follow all lab safety rules as stated in your safety agreement and any verbal rules given by your teacher. Part 1: density of a liquid

Apparatus: 100 milliliter graduated cylinder, triple beam balance, distilled water.

Procedure: 1. Measure the mass of a 100 ml graduated cylinder. Record your mass in the data table to the nearest 100th of a gram (.01 grams) this is very important. If you think the mass is exactly 40 grams it should be recorded as 40.00 grams. Record this as the mass of the empty graduated cylinder.

2. Fill the graduated cylinder exactly ½ full with distilled water. Record the exact volume of water in your data table to the nearest 10th of a milliliter (.1 milliliter). If you think the volume is exactly 10 milliliters it should be recorded as 10.0 milliliter. Record this as the volume of distilled water.

3. Measure the mass of the graduated cylinder and distilled water. Record the mass in the data table to the nearest 100th of a gram. (.01 grams). Record this as mass of graduated cylinder and distilled water.

4. Subtract the mass of the empty graduated cylinder from the mass of the graduated cylinder and the distilled water. Record this as the mass of distilled water.

5. Repeat steps 2 - 4 using different volumes of distilled water. For trial 2 fill the graduated cylinder so that it is about 1/4 full. For trial 3 fill the graduated cylinder until it is about 3/4 full and for trial 4 till the graduated cylinder until it is full. Do not fill it above the highest mark.

6. Calculate the density of the water for each trial.

7. Calculate the average density of the water.

8. Ask the teacher for the accepted value for the density of water and then calculate the percentage of error for the experiment. NAME:______Block ______No:______DENSITY OF A LIQUID DATA TABLE

TRIAL # 1 TRIAL #2 TRIAL # 3 TRAIL #4 1/4 1/2 3/4 4/4 full Mass of empty graduated cylinder (1) Mass of cylinder and water (3) weigh the cylinder Mass of water alone (4) take (3)- (1)= Volume of water (2) read cylinder

Density of water d=m/v

AVERAGE DENSITY OF ALL TRIALS ______

ACCEPTED DENSITY OF water.______

ACCURACY OF MEASUREMENTS

% ERROR =