Vocabulary
What is anything that has mass and takes up space
Matter
What does the C stand for in CER? What does it do in the scientific explanation?
Claim - it answers the question (first sentence of explanation)
Why must we use models to learn about atoms/molecules?
They are too small to be seen/they are on the nanoscale
Every graph should have this so the person reading the graph knows exactly what it is about
Why should we use data tables?
To organize/present data from investigations/experiments
What is a molecule made up of?
Atoms
What does the R stand for in CER? What does that do in the scientific explanation?
Reasoning
The reasoning helps to connect the evidence with the claim
What happens to the molecules of a substance when it dissolves?
They break apart/separate/the solvent pulls the molecules apart
If a line graph has a positive trend, describe how the line is moving on the graph.
The line is increasing/going up
What two variables are presented in data tables?
The independent variable and dependent variable
What is a property? List 3 different examples of properties.
A property is used to describe a substance
Ex. (but not limited to) color, taste, texture/hardness, smell, solubility, weight
When sugar dissolves in water, we can no longer see the sugar and it seems to "disappear". What are two different ways to prove that the sugar is still in the water?
Taste, we could evaporate the water, mass would be the same when the sugar is added as well as after the sugar dissolves
Order these from smallest to largest: substance, atom, mixture, molecule
atom --> molecule --> substance --> mixture
If I were to make a line graph for plant growth over 5 weeks, which axis would the week number go on? (x-axis or y-axis)
X-axis
A data table shows the plant height as follows:
day 1 - 2cm
day 2 - 5cm
day 3 - 8cm
Predict the height of the plant on day 4.
11cm (the pattern this plant height followed was +3cm for each day)
What is a controlled variable?
Controlled variable - factor that is kept the same throughout the entire experiment/kept the same every test trial
Options (or close to): (1) answers a question, (2) written for an audience, (3) uses scientific language, (4) describes something that is hard to observe, (5) uses evidence from investigations/text
In our simulation looking at how different molecules stick together, what were the two features that the simulation made clear helped the molecules to stick together?
The shape (the molecules fit together like a puzzle piece) and a high attraction
Sketch a quick bar graph (with labels) for the following data:
Favorite video game:
Roblox - 2, Fortnite - 3, Minecraft - 1, Other - 2
Must have a title: Favorite Video Game
Must have axis labels: x-axis is the type of video game and y-axis is the number of votes/number of people
Must have labelled bar reaching the correct number of votes
If I were to conduct an experiment measuring the time it took for ice cubes to melt in different light conditions, which is the dependent variable?
Dependent variable - the time it took for the ice to melt (meaning the independent variable is the lighting conditions)
Dependent variable - what we are measuring in an experiment
What is the difference between a solute and solvent? Give an example of each.
A solute - the substance getting dissolved (ex. salt)
A solvent - the substance doing the dissolving (ex. water)
solid - vibrate (can't move much at all); liquid (bounce off each other), gas (spread far apart and move quickly)
we could use a reference book/model/complete an experiment that uses water in all states (i.e., we start with liquid water and apply heat/freeze it)
3 different types of molecules
1. Which graph is the best for comparing amounts in different categories?
2. Which graph is the best for showing different groups of a whole?
3. Which graph is the best for comparing trends over time?
(options are pie chart, bar graph, line graph)
1. Bar graph
2. Pie chart
3. Line graph
What is the independent variable? Which column on a data table would this variable most likely be found in (i.e., first/left/right most/last/middle)?
The independent variable is what we are intentionally changing in an experiment. It is most likely found in the left column (the first).