IV vs DV vs Constant
What is a constant variable?
What state of matter has the most tightly-packed particles?
Solids
Phase change-Liquid->solid
Freezing
From where do plants directly get energy?
The sun
What is a producer? What do producers put into the air/water?
An organism, usually a plant, that takes in the sun for its energy to make food. They put oxygen into the air/water they live.
What is an independent variable?
An independent variable is what the scientist changes directly in an experiment.
Why does liquid water take the shape of a cup it is poured into, but solid ice cubes do not?
Because it has an indefinite shape
What is the phase change called when liquid turns into gas?
Vaporization or evaporation
Mr. Scott has a beaker full of 10g of water without a top. After two days, there was 8g of water left.
What most likely happened to the water?
Evaporation.
What is the role of a decomposer in a food web?
Decomposers return nutrients to the soil after breaking down dead organisms.
What is a dependent variable?
What the scientist measures that depends on the IV in an experiment.
What state of matter's particles slide past each other?
Liquid
Is energy increasing or decreasing from liquid->gas?
Increasing
I fill two equal sized boxes with two different things. Box A is filled with rocks and Box B is filled with feathers.
Compare the volume and mass of the boxes.
What is the original source of energy in all ecosystems?
The sun
Which of these words means the same thing as a constant?
I. Different
II. Similar
III. Same
III
Make the three hand gestures for solid, liquid, and gas.
Must mime all three correctly with their hands.
Solid-two closed fists vibrating
Liquid-two closed fists brushing past each other
Gas-crazy fists
A cool can of soda was set on a table on a hot summer day. A student observed water vapor in the air forming water droplets on the outside of the soda can. What phase change occurred? What happened to the energy as it went from water vapor to water droplets?
Condensation, because gas cooled into a liquid. Energy decreased.
Experiment-Mr. Scott puts 100g of ice into a closed container then melts it. What is the final mass?
Final mass is 100g.
Read the text below and tell me the producer, primary consumer, secondary consumer, and decomposer.
Fruit trees use sunlight to produce oxygen and glucose. Toucans and monkeys eat the fruit from the trees in which they live. Jaguars and eagles get their energy source from the toucans and monkeys. There are also a lot of worms that live in the moist soil, which return energy from dead plants and animals back to the soil for plants to use.
PC-Toucan and/or monkey
SC-Jaguars and/or eagles
Decomposer-Worms
What is the IV in the following experiment: Two plants are grown with or without soil, but placed in identical amounts of water and sunlight.
Amount of soil/with or without soil
Rank solid, liquid, and gas by their amount of energy (most to least).
1. Gas
2. Liquid
3. Solid
Going from a gas to a solid, are you adding or removing energy? (Think heat.)
Explain.
Removing, because removing thermal energy (heat) makes something colder, and a gas is the warmest, then liquid, then solid.
Describe the differences between solid, liquid, and gas particles. (Think how they look, can use hand motions)
Solids have tightly-packed particles, liquids have loosely-packed particles that slide on each other, and gases have particles all over the place (or use correct hand motions).
Describe the flow of matter and energy in an ecosystem, beginning with producer and ending with what a decomposer does.
A producer starts the cycle by taking in energy from the original source, the sun, then is eaten by the primary consumer. After, the primary consumer is eaten by the secondary consumer. Eventually, some of the primary consumers, secondary consumers, and producers die and are broken down by decomposers who return the nutrients to the soil to be used by producers.