Show:
States of Matter
Separating
Change
Doing Science
Burning
100
Answer: Solid, Liquid, gas
What are the states of matter?
100
One thing we can use to separate solids of different sizes from each other.
What is a colander or a sieve?
100
the matter can change and then be returned to its original state.
What is a reversible change?
100
A way to test a hypothesis, see what happens when...
What is an experiment?
100
The 'matter' that is used up in burning.
What is fuel?
200
The three states of matter that water can be in.
What is water, ice, steam or vapor?
200
The action of removing very fine particles of a solid from a liquid
What is filtering?
200
Name two examples of reversible changes that can be found in the kitchen.
Ms. J will determine.
200
What is a scientist most interested in when doing an experiment? what is her purpose for doing it?
A scientist is most interested in what happens in the experiment (her results and data), in what she observes because it gives her new information and something to think about.
200
The element or part of air that is needed for something to burn.
What is oxygen?
300
Name five substances that are liquid at room temperature.
Ms.J will decide.
300
Give two examples of substances we filter in the kitchen.
What is coffee and tea?
300
These are other names for reversible and irreversible changes
What is physical change (reversible)? What is chemical change (irreversible)?
300
What is needed for something to burn?
Fuel, Oxygen, a source of heat/ light.
400
It starts as a solid, becomes a liquid in water, and stays behind as crystals if the water evaporates.
What is salt or sugar?
400
If we have filtered the water so that it is not longer muddy looking - should we filter it more and what kind of filter should we use?
Yes- there may be micro- organisms - so small we cannot see them- that could make us sick. We should use a filter that has holes so small we cannot see them o catch the micro-organisms.
400
Name three clues that a chemical change has occurred.
Rusting, bubbling or fizzing, burning, color change, hardening, etc.
400
When we did the dissolving jelly experiment, what had to be kept the same, what was different and why?
Everything had to be the same except for ONE thing for each group for each time they did the steps- each group had ONE thing that was different - that they changed for each step. This was so we could see if how that one thing changes the dissolution time.
400
What does burning produce?
Burning produces water, carbon dioxide, heat/ light and sometimes ash or soot
500
It was thought to be a substance long ago but now we know it is not. In its presence substances change states of matter and/or even become something completely new.
What is fire?
500
Describe - in order - how to separate the following mixture: small wood chips, salt, iron filings, some medium sized leaves and sand.
First remove the leaves by hand. Sieve out he small wood chips. Use a magnet to get out the iron filings. Mix the remaining sand and salt with water to dissolve the salt. Filter out the sand. Let the water evaporate.
500
When we make tea, the water bubbles as we heat it and changes color when we add the tea leaves- two clues that a chemical change has occurred. Explain why making tea is NOT a chemical change.
A chemical change means that the substance we end up with is not the same as what we began with. When we make tea, the tea only dissolves in the hot water. It is tea at the start and tea at the end.
500
What experiment could we try to determine if three unknown white powdered solids are the same thing or different? How would this help us?
We could try dissolving them in water and then let the solutions sit and then evaporate. If and how they dissolve and what happens after they dissolve would give us lot of information about the solids.
500
How did we realize that burning something (like a candle) needs oxygen and produces carbon dioxide and water?
When we burned the candle, Ms. J put a beaker over it. It eventually went out. This was because the candle used up all of the oxygen in the beaker - leaving only carbon dioxide. We also saw the condensation(of water) inside the beaker.