Definitions
Parts of an Atom
Mixtures and Solutions
Density = mass/volume
How dense are you?
100
The amount of matter in an object.
Density
100
A __________ is in the center of an atom and has a positive charge.
Proton
100
Mixture or Solution? Tossed salad
Mixture - the parts of the salad can be separated. Even the dressing!
100
Iron Block : Mass 20g Volume 2cm3 What is the density?
Density = 10
100
Which item is more dense: an elephant or a rock?
A rock! Even though an elephant is bigger and weighs more, the rock has more molecules shoved tightly together.
200
The smallest particle of an element.
Atom
200
A ____________ is in the center of an atom and has no electrical charge.
neutron
200
Mixture or Solution? chocolate chip cookies
Solution - once it is baked, you can never separate the flower from the sugar and so on.
200
Textbook: Mass 600g Volume 120 cm3 What is the density?
Density = 5
200
Which item is more dense: a baseball or a ball of clay the same size?
The ball of clay. The two items are the same size but the clay would weigh more meaning it has more density.
300
Elements combine to form a(n)________________.
Compound
300
The entire center of an atom is called its ________________.
nucleus
300
Mixture or Solution? Dry Salt and Pepper in a bowl
Mixture - it may take time and patience but it is possible to separate them back into two different piles
300
Baseball Mass 329g Volume 94 cm3 What is the density?
Density = 3.5
300
You mix a salad dressing together. The oil floats to the top while the vinegar sinks to the bottom. Which liquid is more dense?
Vinegar - The oil is less dense so it sits on top of the vinegar.
400
A solution is _______________ if it has a large amount of solute compared to the amount of solvent.
concentrated
400
A ______________ travels around an atom and has a negative electrical charge.
electron
400
Mixture or Solution? Iron and Sand
Mixture - Just wave a magnet about them and the iron will stick to the magnet leaving the sand behind.
400
Ball of Clay Mass 418.5 Volume 93cm3 What is the density?
Density = 4.5
400
Which item is more dense: a plastic mixing bowl or a metal mixing bowl of the same size?
Metal Bowl - metal bowls usually weigh more than plastic bowls so if they are the same size then the one with more weight is more dense.
500
A solution is __________________ if it contains all the solute that can be dissolved at one time.
saturated
500
The smallest particle of an _______________ is called an atom.
element
500
Mixture or Solution? Sugar in water
Solution - Sugar dissolves and becomes part of the water. You can no longer distinguish between the water and the sugar grains.
500
Cell Phone Mass 48.75 Volume 15 cm3 What is the density?
Density = 3.25
500
Which item is less dense: oxygen or helium?
Helium - helium balloons float higher and higher because they are lighter and less dense than the oxygen in the air.
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