Elements
Temperature at which substances changes from a solid into a liquid
Melting point
2. all particles are in motion (moving)
3. there is some space between any two particles
4. heating up matter gives the particles more energy and lets them move faster
The best form of separation for sand and rocks
Sieving
What is the formula for concentration
percent concentration = volume of solute / volume of solvent X 100
Define ethics
Decisions or actions in science that involve doing what is right and fair.
Pure substances consisting of a single type of atom
Element
Tightly packed particles
Solid
To separate nickel from dirt and mulch, we use which separation technique
Magnetic separation
You have 5 mg of salt and 20 ml of water. What is the concentration?
25%
Define intercultural consideration
Ways that scientists show respect for different cultures.
A substance (solid) that will dissolve in a solvent
Solute
No fixed shape (takes shape of container) but fixed volume
Liquids
Why would we use filtration? Provide an example
To separate an insoluble solid from a pure liquid or solution. Example salt from water
13.5 g
When scientists develop new technologies, how can they ensure the technologies are used responsibly and ethically?
Fair
sustainable
Honesty
Point at which no more solute can dissolve in a solution
Saturation
Little to no attraction between particles
Gases
Provide the best order to separate these substances. Justify why.
Water, sand, salt, little rocks, nickel
1. magnetic
2. sieving
3. filtration
4. evaporation
If you wanted to make a solution less concentrated, what could you do? Why would this work?
Scientists are developing a new medicine; they consult with local Aboriginal communities about different techniques and resources (plants) that have been used in the past. What can the scientists do to consider the communities they spoke with?
Acknowledge where they got the information
Respect the groups they spoke with
Changing in state from a solid into a gas without becoming a liquid
Sublimation
Only wiggling and vibration
Solids
Define distillation
uses of evaporation and condensation to separate substances. Evaporated liquid is captured and condensed back into liquid form.
You completed an experiment with 10 separate cups of water each with 10 ml in it. The first cup receives 1 tablespoon of hot chocolate solute, the fifth cup receives 5 tablespoons of hot chocolate, and the tenth cup receives 10 tablespoons of hot chocolate. Explain the trend. What cup of hot chocolate would you want for a chocolatey cup of cocoa
Trend as you add more solute of chocolate to each cup, the concentration increases.
You would want cup 10.
Why is it important for scientists to work with people of different cultures and communities?
It allows for different perspectives to be included and learned from. Cultures have been around for a long time (1000s of years) and have a lot of knowledge and different perspectives on a variety of topics.