1-3 Density “Think About It” Which is heavier? Which is denser? Explain density in your own words. 1 pound.

Slides:

Advertisements

Similar presentations

Errors in Measurements Class measurements for the density of gold (in g/mL) Group 117.8Group Group 218.0Group Group 317.9Group

Advertisements

CHEMISTRY 1211 Chapter 1. CHEMISTRY WHAT IS IT? SCIENCE DEALING WITH THE COMPOSITION AND ENERGY OF MATTER AND THE CHANGES IN COMPOSITION AND ENERGY THAT.

Significant Figures. 1.All nonzero digits are significant. Example: 145 (3 sig figs) 2.Zeroes between two significant figures are themselves significant.

Using Scientific Measurements.

Measurements: Every measurement has UNITS.

Density. What is It? Derived unit which shows the mass per unit of volume More dense materials are “heavier” than less dense materials Density compares.

Data analysis (chapter 2) SI units and the metric system ▫Base units  Time (sec)  Length (m)  Mass (kg)  Temperature (Kelvin)  Derived base units.

MeasurementsandCalculations. Numbers Numbers in science are different than in math. Numbers in science always refer to something grams 12 eggs.

Starter 1.How would you record the following measurements? How many sig figs? a.b. 2.Count the sig figs in the following measured values: a

Measurements: Every measurement has UNITS.

Pre-AP Chemistry: Unit 1: Test Review

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

Using Scientific Measurements. Uncertainty in Measurements All measurements have uncertainty. 1.Measurements involve estimation by the person making the.

Chapter 2 Section 3 Using Scientific Measurements.

And Problem Solving in Chemistry Precision and Accuracy Significant Figures % error Measurement Density.

measured certain digits. last digit is estimated, but IS significant. do not overstate the precision 5.23 cm cm Significant Figures (Sig Figs) (uncertain)

Scientific Notation and Significant Figures Chemistry and Society Fall 2006 Giddy-up!

Math and Measurement. Significant Figures Significant Zeros 1.Leading zeros are never significant 2.Trailing zeros only count if there’s a decimal point.

CHEMISTRY the study of matter MATTER anything that has mass and has volume.

DENSITY… Will it sink or float??. Why do some things float… … and other things sink?

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!

Numbers There are two kinds of numbers in the world: exact: – example: There are exactly 12 eggs in a dozen. – example: Most people have exactly 10 fingers.

Significant Figures Density % Error. Significant Figures  The number of digits reported in a measurement.  All the known digits plus one estimated value.

Using the scale below, measure and write down how long the arrow is. Significant Figures - Introduction There is a level of uncertainty in our.

Introduction to Matter Lecture: Calculating Density.

Chapter 2 Measurements and Calculations Or It all adds up!

Practice ABC Temperature conversions 270 K _____ C 345 K_____ C 50 C _____ K -30C _____ K Known value is 7.5ml Describe.

Significant Figures. Significant Digits or Significant Figures We must be aware of the accuracy limits of each piece of lab equipment that we use and.

Ch 5 How to take measurements and make proper calculations We will deal with many types of measurements and calculations throughout the year. The types.

Chemistry Chapter 2D Uncertainty in Measurement. Uncertainty  Represents how well a measurement was made  Science is ‘peer reviewed’  We don’t just.

Significant Figures Homework: Working with Numbers handout # 1 – 13 Significant Figures handout #

PSC1341 Chapter 1 Definitions Physical Science: any of the natural sciences (as physics, chemistry, and astronomy) that deal primarily with nonliving.

Relating mass and volume Notes, p Which is heavier: 1 pound of lead or 1 pound of feathers? SAME: Both weigh 1 lb.

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.

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

Bell work What does density tell you about an object?

Relating mass and volume. Which is heavier: 1 pound of lead or 1 pound of feathers? SAME: Both weigh 1 lb.

Chemistry Math in Chemistry Unit. How wide is our universe? 210,000,000,000,000,000,000,000 miles (22 zeros) How would you use this number in a calculator?

Relating mass and volume

Using Scientific Measurements.

BELL RINGER Consider the burning of gasoline and the evaporation of gasoline. Which process represents a chemical change and which represents a physical.

Significant Figures Sig Figs.

Lesson Objectives Know how perform mathematical operations using significant figures.

Significant Figures Box and Dot Method.

Measurements and Significant Figures

Rules for Determining Significant figures

CH. 1 - MEASUREMENT I. Units of Measurement.

Relating mass and volume

Chemistry I Chapter 5 Review

OPENING ROUTINE A material will float on the surface of a liquid if the material has a density less than that of the liquid. Given that the density of.

Intensive and Extensive Properties

Warm up: Mass of Object g Volume of Water 12.5 mL

And Calculating with Significant Digits

WARM UP (for NOTES) 1. Which is more dense, water or wood?

Using Scientific Measurements.

Scientific Measurement

Scientific Measurement

Determining if an object will float or sink

Analyzing Data Chemistry Chapter 2.

Significant Figures or Digits

(Characteristic property)

Accuracy, Precision, Percent Error, Significant Figures and Rounding

Unit 2: Physics Sc 3200.

Chemistry Measurement Notes

Viscosity Is the resistance to flow Is an Intensive Property Example:

2.b Using Scientific Measurements

2.3 Using Scientific Measurements

Significant Figures (Sig figs)

Significant Figures Overview

Presentation transcript:

1-3 Density “Think About It” Which is heavier? Which is denser? Explain density in your own words. 1 pound

1-3 Density 1.What is density? 2.How do you measure density? 3.How is accuracy & precision related to your measuring device & measurements? 4.How do you calculate density from measured data? 5.Is density an intensive or extensive property?

1. What is density? Definition: Equation: Units:

Density: Will it sink OR will it float? SINKFLOAT

2. How do you measure density? SOLIDLIQUID MASS VOLUME

3. How is accuracy and precision related to your measuring device and measurements? Precision: Accuracy: –% Error

4. How do you calculate density from measured data? What is the volume of a metal piece that has a mass of 3.25 g and a density of 1.82 g/mL? Round to 3 significant figures.

[Significant Figures] Captive zeros are significant Leading zeros are NOT significant Trailing zeros are NOT significant unless there is a decimal in the number

Calculating Density

You have the same volume of A & B, but A’s density is larger. What do you know about their masses? You have the same mass of A & B, but A’s density is larger. What do you know about their volumes?

5. Is density an intensive or extensive property? INTENSIVEEXTENSIVE