Homework 10 Objective 3

Objective 3:

1. The four properties of acids are that they conduct electricity, they are sour tasting, they reacts with a base, and they react with active metals.
2. The four properties of bases are they conduct electricity, they are bitter tasting, they react with acids, and they feel slippery on skin.
3. Most liquid acids will turn blue limtus paper pink, it doesn't affect red. Bases turn red litmus paper blue.
4. Maybe the food would be sour tasting if it contained acid because one of the characteristics of acid is that it tastes sour.
5. There are chemicals in the fertilizer and it could get into cuts on your hands. Also, it's for plants. not humans, those type of chemicals can irritate your skin.

Citations:
http://plaza.obu.edu/corneliusk/ps/chem/a_b.pdf
http://wiki.answers.com/Q/How_can_you_use_litmus_paper_to_distinguish_an_acid_from_a_base
http://homegarden.me/why-is-it-wise-to-wear-gloves-when-spreading-fertilizer-in-a-garden/
http://answers.yahoo.com/question/index?qid=20080508201726AAJBckx

Homework 10 objective 2

Objective 2

1. Concentration is the measure of how much of one substance in another substance. To concentrate a solution, you put more solute in a solvent. The units for measuring concentration are molarity, normality, and weight. So to measure the concentration you need to find the ratio of the solvent to the solute.
2. You can figure out what a substance is because of its solubility. You can use the characteristic of solubility to know how much of a substance can be dissolved in a solvent. If you know the solubility of a solvent, then you know how much of a solute can be added until the solvent is at its maximum concentration.
3. The three factors that affect the solubility are temperature, pressure, and the type of solvent.
4. High temperature, or heat, is required to break the bonds that hold the molecules together. Solubility depends on heat.
5. You can do tests on the substance to see how much of something can be dissolved in it. This will help you identify the substance, if you already know the solubility.
Citations:
http://en.wikipedia.org/wiki/Concentrationhttp://web.viu.ca/krogh/chem311/units%20of%20concentration.pdfhttp://wiki.answers.com/Q/Why_is_solubility_useful_in_identifying_substanceshttp://answers.yahoo.com/question/index?qid=20080821184932AACBLG2http://en.wikipedia.org/wiki/Solubilityhttp://answers.yahoo.com/question/index?qid=20081226161840AAPfmkg

Homework 10 objective 1

Objective 1

1. A solution is a homogeneous mixture of 2 substances. A colloid is a substance evenly dispersed throughout another substance. A suspension is a homogeneous fluid that has solid particles that are too large for sedimentation.
2. When a solution forms, the particles of a solute leave each other and become surrounded by the particles of the solvent.
3. The boiling point of a solvent increases when a solute is added because a solution has a higher boiling point than a pure solvent. The freezing point decreases too.
4. You have made a solution because the particles dissolve.
5. A solute increases the boiling point because a solution has a higher boiling point than a pure solvent. It also lowers the freezing point.

Citations:
http://en.wikipedia.org/wiki/Solution
http://en.wikipedia.org/wiki/Suspensions
http://en.wikipedia.org/wiki/Colloids
http://wiki.answers.com/Q/What_happens_to_the_solute_particles_when_a_solution_forms
http://www.animations.physics.unsw.edu.au/jw/freezing-point-depression-boiling-point-elevation.htm
http://en.wikipedia.org/wiki/Boiling-point_elevation

Forgot Objective 4

Oops! I forgot Objective 4! Here it is.

Objective 4:

1. A change in temperature causes matter to change state.
2. As the thermal energy in something increases the particles start going crazy and bouncing all around. If it's a solid, then it turns into a liquid. If it's a liquid, (like boiling water) then it turns into a gas.
3. When the matter is changing state, the temperature is being put into the process of the change, so it stays the same. When the matter is not changing state. the energy is being put into raising the temperature.
4. A solid changes state because when it gets heated up, the particles start moving around and heating up.The thermal energy causes it to melt.
5. The potato will generate steam and the steam might a really high pressure inside the potato so it might explode.

Citations:
http://wiki.answers.com/Q/Why_does_the_temperature_of_matter_remain_the_same_while_the_matter_changes_state
http://wiki.answers.com/Q/Why_should_you_poke_holes_in_a_potato_before_baking_it

homework 9 objective 5

Objective 5

1. Heat engines turn thermal energy into mechanical energy.
2. An external combustion engine performs conduction as it heats up a different object as its work. An internal combustion engine is powered by radiation because they are fueled by fire/combustion. They both turn heat into energy that can fuel the automobiles.
3. Internal combustion engines are used more frequently because they deliver power better and they weigh less than external combustion engines.
4. The refrigerator takes the hot air out, verses what we think, putting cold air in.
5. The compressor compresses the gas in the refigerator. This causes the temperature to rise. So, the heat-exchanging coils allow the refrigertant to disperse the hot air.

Citations:
1.http://wiki.answers.com/Q/Why_is_a_car_engine_an_internal_combustion_engine_rather_than_an_external_combustion_engine  
2. http://home.howstuffworks.com/refrigerator2.htm

Homework 9- objective 3

Objective 3:

Homework 9

Objective 3

Objective 3:

1. The three types of heat transfer are conduction, convection, and raditation.
2. Heat goes from cold to hot. The cold air is not let out, the hot air is let in.
3. Conductors let energy and heat go through it, and insulators don’t let energy and heat pass through.
4. Copper would be a better conductor because it lets the heat and energy go through easily.
5. I would build a fire because then the hot air would be given off. This is an example of radiation because the objects are not touching. Then I would build a tent because this would keep the body heat inside the tent. This is also an example of radiation because the objects aren’t touching.

Citations:
http://www.tapinsulation.com/heat.html

Homework 9- objective 2

Objective 2:

Homework 9

Objective 2

1. The temperature sensor of the thermometer is on the end bulb.
2. The Celsius scale is the most simple scale, it is from 1 degree for freezing and 100 degrees for boiling. The Fahrenheit scale is 32 degrees for freezing and 212 for boiling. The Kelvin scale is a boiling point is 373 K and a freezing point of 273 K. The difference in Kelvins is that it has absolute zero. This is when all matter stops moving.
3. 41 degrees Fahrenheit.
4. 460 degrees Celsius
5. 50 K
Citations:
http://www.wbuf.noaa.gov/tempfc.htmhttp://www.metric-conversions.org/temperature/celsius-to-fahrenheit.htm