Food Chains
This is where the first item in a food chain receives it's energy from
What is the sun?
Baking a cake is an example of what kind of change and why?
What is a chemical change, because the chemical reactions that take place during being heated, cause a new substance to be formed.
Chuck was chopping wood. When he was done, he had 25kg of firewood. This is the amount of wood that he had before he chopped it
What is 25kg?
What is a 'constant' in a scientific experiment?
What is something that stays the same (does not change) throughout the course of the experiment.
(Ex: the amount of water you would feed to a plant if you were testing different light types for plant growth.)
The Law of Conservation of Matter states that
What is matter cannot be created or destroyed. The mass of an object never changes, no matter how the parts are rearranged.
True or False
A dead animal is a decomposer.
What is False?
Mixing baking soda and vinegar (like in our classroom lab) and dropping an Alka-Seltzer tablet in water both create a new substance, indicating a chemical reaction. What evidence did we see that proves this to be true?
What is the production of visible bubbles, a clear indication of a chemical reaction and the formation of a new substance (carbon dioxide gas) when the two combine!
Draw a bar graph to display the data:
Ms. Smith was making chocolate milk. What is the mass of the chocolate milk?
Milk:450 g
Chocolate Powder: 15 g
Mass of Chocolate Milk: _________?
What is 465 g AND displays an appropriate bar graph?
What is a variable in a scientific experiment?
What is any factor or condition that can change or be manipulated, allowing scientists to observe its effect on other aspects of the experiment
(Example: The type of light a plant received if I was trying to see which light gives a plant the most growth in a period of time, the variables would be: a lamp, the sun, uv light, red light, etc)
This would be how a scientist could separate salt from water
What is
1) use a small screen to stop the flow of the salt
or
2)use evaporation where we could boil the water and the salt would stay
This is the name for the item in a food chain that receives their energy from the sun AND give an example.
What is a producer?
What is algae, plants, grass, etc
The definition of a physical change
What is the form or appearance of the matter will change, but a new substance will not be formed.
Give a scenario when this type of line graph would be fitting to display the data
What is (answers will vary, but should be a time when something started at 0 growth and then skyrocketed)
2 runners want to see who can run the fastest,
Which of these does NOT provide a 'fair' testing environment:
1) They race at the same time of day
2) They are exactly the same height
3) One runs on sand and one runs on pavement
Matter is
What is anything that has mass and takes up a shape?
The arrows in a food chain point towards _________
What is who is receiving the energy?
Baking Soda dissolving in water is like
a) the air around us?
OR
b) coffee creamer being stirred into coffee?
WHY?
What is a - the air around us because the matter is still there, it is just too small to be seen.
B is not correct because we can still see the creamer, even when it is stirred into the coffee.
Give a scenario when this line graph would be appropriate to display your data
What is (Answers will vary: example: amount of rain in a month, etc)
These are examples of a chemical change:
raking leaves
nail rusting
popsicle melting
burning firewood
What are: a nail rusting and buring firewood
(The changes are irreversible)
True or False
A screen would work to separate all three items when sand, pebbles, and larger rocks
False. The screen would separate the sand from the pebbles and rocks, but the pebbles and rocks would still be together.
These are examples of decomposers:
(Must give at least 2 to receive all points)
What are: bacteria, worms, fungus (mushrooms and mold), slugs, flies, termites, dung beetles, etc
This is how we know when a new substance has been formed in a scientific experiment?
What is the new property is different than the original substances?
We know a new substance is formed in a chemical reaction when observable changes occur, such as a change in color, the production of a gas (bubbles), the formation of a solid precipitate, a change in temperature, or a noticeable odor, all indicating that the original substances have rearranged their atoms to create something new with different properties
This type of graph is used to show a comparison of items
while
this type of graph is used to show change over time
What is a bar graph and a line graph?
If I was trying to figure out which material was the best insulator, what would I need to keep constant for the experiment to be 'fair'?
What is (answers will vary)
The type of liquid
The amount of liguid
The temperature of the testing room
Boiling water is a physical or chemical change?
What is a physical change?