Density and Percent Error You’ll love it!. What is this Density Business? Density – a ratio of mass per volume. It is how we measure how compact or “squished.

Slides:

Advertisements

Similar presentations

Advertisements

The density of a material can easily be calculated if we are given the mass and volume of a sample.

Calculations Involving Density

The mass of a sample of material can easily be calculated if we are given the density and the volume.

Calculating Density. 1. What is Density? a. What is the same about these objects?

A Look at Density and How to Calculate It

If objects are the same size they will have the same density. Different materials have different densities. Density is made up of two other measurements.

Chapter 2 “Scientific Measurement” Standards for Measurement Accuracy vs. Precision Significant Figures.

Chapter 2 Section 3 Using Scientific Measurements.

DERIVED UNITS Combining measurements to describe physical properties.

Unit 3 Jeopardy Calculations and problem solving..

“The Density Equation” Mass (g) Volume (mL or cm 3 ) Density (g/mL or g/cm 3 )

1. Which is more dense, water or wood? How do you know? 2. Which is more dense, 1 pound of lead or 100 pounds of lead? Wood, if it sinks in water. SAME!

Daily Science (Aug) 1. Convert 3.56 m into dm 2. Convert 113 lbs into g (438 g in 1 pound) 1. Convert 1.65 km into inches (1 in = 2.54 cm)

Laboratory Calculations

Chem Lab #2 Volume & Density. Pre Lab: Page 1 I Purpose – Measure the volume of a quantity of water in 3 different graduated cylinders. – Determine the.

Accuracy and Precision. Remember these definitions? ► Accuracy – a description of how close a measurement is to the true value of the quantity measured.

Density Calculation Students will be able to use the “Magic Triangle” to solve density problems.

Introduction to Matter Lecture: Calculating Density.

Acids and Bases Titration of Vinegar

SPI Density What is density?  Density is the amount of matter (mass) you have crammed in a given space (volume) Reminder: mass is how much matter.

By Study Helper. Calculating Density The answer is volume, mass, or density Definitions

20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt Those.

Density Equation m V d SymbolVariableUnits dDensityg/cm 3 or g/mL mMassgrams VVolumecm 3 or mL.

DENSITY How to measure and calculate. REVIEW  Density is the amount of matter in a given area  We calculate it by _ Mass_ Density = Volume Common units:

Calculating Density Worksheet Review.  1. How close the particles are in a substance. Or how much mass fits in a certain space.  2. Density is “owned”

DOR: Conversions II 1) 100 FT/SEC TO CM/HOUR 2) 6000 L/MIN TO GALLONS/HOUR.

Percent Difference Calculations How do experimentally determined values compare to actual values?

Unit 2 MATH OF CHEMISTRY 2.6 Are scientists always 100% correct? AIM: How do we calculate percent error ? DO NOW: Please answer the following question.

Calculations Involving Density Calculating Density from Mass and Volume.

Density Notes. What is density? How much mass is in a volume How much matter is in a given space How compact particles are in a space Which is more dense?

SOL Review 1.  Accuracy: measure of how close a measurement comes to the actual true value  Precision: measure how close a series of measurements are.

Earth Science September 7th DO NOW: Write a sentence which explains how the terms “senses,” “observations,” and “inferences” relate to each other. Then,

Chapter 1: The World of Earth Science. Density is defined as the mass of an object per unit volume. It is the relationship between the mass and volume.

Therefore, different densities. Formula Triangle Cover up the thing you want to calculate and the formula will appear! M VD.

Density Lab Density = Mass/Volume. Density of Blocks – Same type, different sizes ItemMass (g) Length (cm) Width (cm) Height (cm) Volume (cm3) Density.

Density. Take a look at the two boxes below. Each box has the same volume. If each ball has the same mass, which box would weigh more? Why?

Unit 1 Review Measurements.

Density Density: the ratio of the mass of an object to its volume.

DENSITY And BUOYANCY.

DENSITY Density is defined as mass per unit volume. It is a measure of how tightly packed and how heavy the molecules are in an object. Density is the.

Warm-Up: Percent Error

Unit 2- Measurements- Accuracy Precision % Error

What is Density? The ratio between the mass of an object and the volume of the same object In other words, it tells you how much matter an object has within.

Warm-Up Perform the following calculations and write your answer with the proper number of sig figs. (1.79 g) / (3.7 mL) = (432.0 cm) x (120 cm) = (2.

Density Chapter 2.

Physical Science Density Challenge 2

Understanding Density

Objectives Calculate the density of a sample using mass and volume.

MEASUREMENT Part4.

Characteristic physical properties

MEASUREMENT Unit Conversions.

Volume and Density.

Accuracy and Precision

Keep at it, you will figure it out!!

A Look at Density and How to Calculate It

Uncertainty in Measurement

3.4 Density More Calculations!.

Accuracy and Precision

DENSITY Density is defined as mass per unit volume. It is a measure of how tightly packed and how heavy the molecules are in an object. Density is the.

Accuracy and Precision

Presentation transcript:

Density and Percent Error You’ll love it!

What is this Density Business? Density – a ratio of mass per volume. It is how we measure how compact or “squished together” something is. Less density More density

Which is more compact? So which has a larger density?

Now with MATH! Density = mass ÷ volume What is the density of something with a mass of 15g and a volume of 5.2mL? mDVmDV D = 15g = 2.9 g/mL 5.2mL

UNITS!! I’m dividing mass (g) by volume (mL), and neither of those units cancel out!! So what do I do? KEEP THEM! The unit for density is g/mL or g/cm 3. These are the same thing…

You Do Two! What is the density of something with a mass of 8.3g and a volume of 21.4mL? What is the density of an object with a volume of 30mL and a mass of 60g? D = 8.3g ÷ 21.4mL = 0.39 g/mL D = 60g ÷ 30mL = 2 g/mL

What If I Know Density?? What is the mass of something with a volume of 25mL and a density of 2g/mL? Cover up the one you NEED on the triangle. Then solve! m = D x V = 2g x 25mL mL mDVmDV = 50g

You Do Two What is the volume of an object with a density of 0.8 g/mL and a mass of 12g? What is the mass of an object with a volume of 12cm 3 and a density of 1.8 g/cm 3 ? mDVmDV V = m = 12g = 15mL  20mL D 0.8 g/mL m = D x V = 1.8g x 12cm 3 = 22g cm 3

Percent Error Percent Error - how far off your measurement is from the true value. % error = | your result - true value | x 100 % true value Absolute value: Pretend it’s positive even if it’s not x 100% x 100 in your calculator and write a % at the end of your answer.

See it in Action! You get a mass of 13.5g in lab. The true value is 15.2g. What is the percent error? % error = | your result - true value | x 100 % true value = |13.5 – 15.2| x 100% 15.2 = 11.18% = 1.7 x 100% 15.2

You Do Two You get 14.8mL, but the true value is 10.4mL. What is the % error? You get 58cm 3, but the true value is 65cm 3. What is the % error? | | x100% = 4.4 x100% = 42.31% | | x100% = 7 x100% = 10.77% 65 65

Now for Lab! You need: –Goggles (cabinet in the back) –Apron (bottom drawers) –Pencil –Calculator