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Physical or Chemical Property? Odor

Odor is a physical property. You can observe it without the presence of a chemical reaction. You can smell coffee without observing a chemical reaction.

Pure substance or Mixture? 24K gold

Pure substance 24K indicates all gold atoms Any other carat is an alloy (14K)

0K or 0°C Which is colder?

Zero Kelvin, that’s absolute zero

Homogeneous or Heterogeneous Mixture 5% vinegar solution?

Homogeneous Mixture You can only see one phase (uniform composition)

C p tin=.228J/g°C C p copper=.388J/g°C Which contains more heat: 1g of tin heated 1 degree or 1g of copper heated 1 degree?

Copper If the temperature raised a degree it must have absorbed.388J

State the Law of Conservation of Energy.

Energy cannot be created or destroyed, only transferred.

Name at least 5 types of energy.

ChemicalNuclear KineticPotential SoundSolar ElectricalLight Heat

Endothermic or Exothermic Baking bread?

Baking bread is an endothermic reaction Energy is absorbed into the bread. Energy is needed for the “rising” to occur.

The energy given off when bonds are broken is an example of __________.

Chemical Energy

Which particle model has more kinetic energy? Which is an element? a. b.

There is less order so this one has more K.E. This is the element.

Briefly describe the heat transfer when someone gets into a cold swimming pool.

Heat from your body is transferred into the colder pool. Cold is NOT transferred to your body.

Chemical or physical change Dissolving sugar?

Physical change No change in composition occurs

Exothermic or Endothermic? Condensation

Exothermic Condensation is gas to liquid… there is less energy in a liquid than a gas, so energy must have been released.

One base unit is the meter. Give an example of a modified base unit.

Any base unit with a metric prefix. Ex. Millimeter,mm

This type of change indicates a chemical reaction. What is it? *note-movie is off the top of the screen to hide the answer. Mute before playing

A precipitate $200 for color change answer only

An inactive sugar pill is a ____________. It helps determine whether the subjects mind was the independent variable

placebo

In this type of experiment, it is unknown to the researcher whether the subject is receiving a placebo or an active drug.

A double-blind experiment

Sleep studies were done on women who were having nightmares. It was found that they were all eating Ben and Jerry’s Ice Cream 10 minutes before bed. What is the dependent variable?

The occurrence of nightmares The IV effects the DV.

Researchers found a correlation between males age and high death rates. What variable would be changed for the control group?

Either: Males above age 24 Females age 15-24

Males age tend to have higher mortality rates due to their risky behaviors. Name 3 other variables that would affect the dependent variable.

Distance traveled to school/work, parents, type of food they eat, genetics, disease, bad luck

Explain the difference between mass and weight.

Mass is the amount of matter. Weight is the force produced by gravity acting on mass.

Define kinetic energy then define potential energy.

K.E.- the energy of motion. P.E.- the energy of position; stored energy

Which term describes the energy that is transferred between two objects?

Heat describes the energy that is transferred between two objects.

Define specific heat capacity.

Specific heat capacity is the amount of energy that is required two raise 1 gram of a substance 1°C.

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Fill in the blanks with terms. In scientific experiments, the ______ effects the _____.

The independent variable effects the dependent variable.

Convert 155K to °C

155K – = °C

What is this an example of?

A heterogeneous mixture.

Name 4 characteristics of a gas.

Compressible, High K.E., Variable volume, Variable shape Free to flow

Using the definitions of temperature, average, and evaporation explain how it is possible for an ice cube to evaporate in the freezer.

Temperature is the average K.E. of a substance. In this case, average means some particles are moving faster than average (some slower). The faster particles have enough energy to break free from the surface (evaporation).

Say and spell your teacher’s name

Czyryca

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