Scientific Method
Energy
Measurements
Significant Figures
Specific Heat
100

What is a hypothesis?

A reasonable and testable explanation for observationbs

100

What is energy?

The ability to do work

100

What is accuracy?

How close a measurement is to the true or actual value

100

Leading zeroes and trailing zeroes without a decimal are always __________________________

Not significant

100

What is heat?

The energy transferred between objects that are at different temperatures

200

What is an independent variable?

It is what is being tested or changed during the experiment

200

What does the Law of Conservation of Energy state?

Energy cannot be created or destroyed - it can only change forms

200

What is precision?

How close several measurements are to each other

200

Nonzero numbers, captive zeroes, and trailing zeroes with a decimal are always _____________________

significant

200

Heat always travels from _______ to ________

warm to cool

high heat to low heat

300

What is a dependent variable?

It is what is being measured at the end of an experiment; it depends on the independent variable

300

Give an example of an energy conversion using an everyday example

Ex. plugging in a lamp turns electrical energy into light energy

Ex. eating food turns chemical energy into mechanical or kinetic energy

Ex. pulling back and releasing an arrow turns potential energy to kinetic energy

Other examples are acceptable

300

What is 1.34 x 10-5 written in standard form (normal numbers)?

0.0000134

300

How many significant figures are in the number 12,040 ?

4

300

What is temperature?

The average kinetic energy of a substance

400

What is the difference between a scientific theory and a natural law?

A theory is a well-tested explanation of events while a law is description of events that has never been disproven

400

Give an example of an endothermic reaction

Ex. melting an ice cube

Ex. baking a cake

Ex. photosynthesis

Any example when heat is absorbed

400

What is 6,470,000 written in scientific notation?

6.47 x 106

400

Answer the following in the correct number of significant figures:

7.502 + 0.0009

7.503

(remember: when adding or subtracting, only pay attention to the number of decimal places)

400

Calculate the heat energy required for the following: (HINT: Pay attention to significant figures)

10.0 grams of water with a heat capacity of 4.184 J/gC are heated from 80oC to 100oC.

q = mCAT

q = (10 grams)(4.184 J/gC)(100-80)

q = (10 grams)(4.184 J/gC)(20)

q = 836.8 J

With correct significant figures: q = 800 J

500

What are the 6 steps of the scientific method in order?

Observe and Question

Research

Hypothesize

Experiment

Analyze Data and Form Conclusions

Report Results

500

Give an example of an exothermic reaction

Ex. a fire

Ex. digestion

Ex. freezing water

Any example where heat is released is ok

500

What is 3.5081 x 103 written in standard notation (normal numbers)?

3,508.1

500

Answer the following in the correct number of significant figures:

7.502/0.0009


8,000

(remember: when multiplying or dividing, pay attention to the total number of significant figures)

500

What is specific heat?

The quantity of the energy as heat that must be transferred to raise the temperature of 1 gram of a substance by 1 Kelvin

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