Unit Conversions
In order to cancel out unwanted units, what must happen?
The undesired unit must be found in both the numerator AND denominator.
Give an example of a physical change and a chemical change.
Answers may vary.
Physical - crumbling paper, smashing a can, ice melting, molding clay
Chemical - digestion, cooking, rotting, rusting, chemical reactions
Idenitfy 5 different natural disasters.
Floods, tornados, wildfires, droughts, earthquakes, tsunamis, volcanic eruptions, hurricanes
What protects us from solar radiation?
Our ozone layer protects us from solar radiation.
What kind of energy are organisms constantly emitting into their surroundings?
Thermal energy
How many atoms are in a mole?
6.022 x 1023
Explain the difference between a physical change and a chemical change?
Physical change - a change in a substance's phyiscal properties (form, looks, denisty, etc.)
Chemical change - a change in a substance's chemical makeup/identity/composition
Explain the difference between weathering, erosion, and deposition.
Weathering - the breaking of rc=ock into sediment (smaller rocks)
Erosion - the movement of sediment (caused by gravity, wind, water, animals, etc.)
Deposition - the settling of sediment in a particular spot
How do astronauts combat the loss of muscle and bone mass while in space?
They must exercise, more specifically, weightlift.
Explain why biodiversity is important within an ecosystem.
1. Bounce back - after an ecosystem suffers major harm, the organisms that reside in that ecosystem all do their part to help the ecosystem recover. Many hands make light work.
2. Food availability - if an organism has multiple food sources, it doesn't have to worry about going extinct if one of those said food sources goes extinct
TRICKY TRIPLE: "6.022 x 1023 atoms = 1 mole" is named after which scientist?
Avagadro
Energy is transferred via consumption.
Why should we NOT pollute our watersheds?
Watersheds feed water into several different bodies of water, including aquifers, which is where we get our drinking water from. Polluted aquifers can be bad for the humans and animals that drink from them as well as the plant life sprayed with it.
What are two problems that lack of gravity can astronauts while in space?
1. bone and muscle mass loss
2. inability (or limited ability) to control movement
3. lack of oxygen since the oxygen molecules would all just float away
TRICKY TRIPLE: How is it that we are able to perceive when a stimulus has knocked us out of homeostasis?
Our 5 senses are responsible for our perception of the stimuli in our enviornment.
How many atoms are in 10 moles of gold?
60.22 x 1023 atoms
Identify and explain any 3 types of energy.
Answers may vary.
Kinetic - the energy of motion
Potential - energy based on position or shape
Mechanical - a combination of potential and kinetic
Thermal - heat energy
Chemical - the energy stored in bonds within molecules/compounds
Solar - heat and light energy from the sun
What are two characteristics of planet Earth that make it habitable?
Presence of water
Presence of oxygen
Presence of ozone layer
Presence of magnetosphere
Identify the function of 3 tools needed for manned space travel.
Answers may vary:
- space suit (protection from debris, radiation, and cold temperature)
- space helmet/oxygen tank (provides oxygen for breathing)
- tethers/velcro (need to decrease the likelihood of floating off into space)
- communication devices (...enough said)
- spaceship (transports astronauts to space)
Bristol pinches Avyan's so Avyan yelps and punches Bristol.
What is the stimulus and response?
Identify the type of stimulus and response.
Answers may vary.
TRICKY TRIPLE:
2 mol H2 + 1 mol O2 ---> 2 mol H2O
If we were to use the above equation to solve a unit conversion problem, we would set the reactants and products equal to eachother. Why is that?
2 mol H2 = 1 mol O2 = 2 mol H2O
The Law of Conservation of Mass
Mass is neither created nor destroyed, it simply changes form. To show that mass was not created or destroyed and that it changed form, chemical equations are balanced and the reactants and products are set equal to eachother.
What are the 4 signs of a chemical reaction, and give an indicator of each?
Gas formation - bubbling, odor production, smoke
Solid formation - spontaneous solidification, hardening without freezing
Color change - appearance of unexpected color, disappearnace of color
Energy change - heat, sound, or light production, absorption of heat
Identify a natural disaster and a tool used for its identification.
Answers may vary.
DAILY DOUBLE: If humans were to colonize anoher planet (because we're likely going to mess this one up for future generations), which planet would it be and why?
Mars:
1. proximity to Earth
2. distance from the sun (it's cold on Mars but not as cold as Jupiter)
3. evidence of water in the form of ice
4. rocky planet
DAILY DOUBLE: Explain whether the stimuli we receive, be it internal or external, is to our benefit or to our detriment.
The stimuli we receive are to our benefit, even if the stimuli are uncomfortable. They let us know that something in our internal and/or external environment is amiss, and the problem needs to be addressed.