Density
The equation for Density is:
What is Density = Mass / Volume?
These two terms refer to the temperature where a substance transitions between being a solid and a liquid.
What are freezing (liquid to solid) and melting (solid to liquid) points?
Static electricity is produced by...
What is friction?
If something is magnetic, it is made of...
What is iron?
If a substance is soluble, this means that...
What is: It dissolves into a liquid?
A stainless steel stirring spoon has a mass of 16 grams and a volume of 2 cubic centimeters. Its density is...
What is 8 grams per cubic centimeter?
This state of matter has particles which move the most (have the most energy).
What is a gas?
If George wants to design a new pair of oven mitts, he should be careful to use an _______________. One example of a material he could use would be:
What is insulator? (Also, rubber?)
Two magnets with the same charge will ______ one another.
What is repel?
The term for the liquid used to dissolve particles is...
What is "Solvent?"
A brick has a volume of 50 cubic centimeters and a mass of 100 grams. The density of the brick is...
What is 2 grams per cubic centimeter?
What is a liquid?
Georgiana is trying to buy a CD from a shady guy. He claims he has a rare CD that can sell for hundreds of dollars, but that he will sell it for only $35. Georgiana isn't sure that the CD is real. She knows that CDs are really fancy painted plastic, not metal. These feel a little too heavy, but she isn't sure. To avoid being scammed she could test the CD by...
What is running an electric current through the CD (because metal will conduct electricity, but the correct plastic will not)?
Why does an old penny stick to a magnet, but a modern dime fall?
What is: because old pennies contain iron, but dimes do not?
This refers to a combination of a liquid and dissolved particles evenly distributed and unable to be seen.
What is a solution?
A piece of chalk has a density of 1.5 grams per cubic centimeter. It broke into four pieces with volumes of 2.6 cubic centimeters, 4.1 cubic centimeters, 3.32 cubic centimeters, and 4.98 cubic centimeters. When all the pieces are collected together and put onto a scale, the mass of the chalk is...
What is 22.5 grams?
Ice is less dense than liquid water because...
What is: The water molecules trap air in between themselves as they freeze, expanding and becoming less dense?
A circuit with no gaps or breaks in it is called...
What is a closed circuit?
An electromagnet is formed by...
What is sending electricity through a coil of soft metal?
Jeffrey prepares an experiment to determine the identity of an unknown substance. He determines that it must be one of the following materials: sand, salt, iron, or wood. He finds that the substance stays cool to the touch even when placed in the window for a long time. When he drops a fridge magnet next to the bowl, the substance does not react. However, when his cousin, Jamie, spills water into the bowl, it begins to dissolve. The most likely identity of the substance is:
What is sugar? (Insulator, non-magnetic, soluble)
Charlotte prepares a cup of ice water. Ice has a density of 0.92 grams per cubic centimeter. Liquid water has a density of 1.01 grams per milliliter. She carefully adds 7 ice cubes, and 2.4 milliliters of water to the glass. If the ice cubes each measure 2 cubic centimeters, the total mass of the ice water in Charlotte's glass is about...
What is 15.3 grams?
The process by which a gas changes to become a liquid is called...
What is condensation?
Matt is trying to charge his phone, but his pet rabbit, Darling, chewed the cord apart. He has the following supplies: tooth floss, thread, a plastic straw, a rope cord, a piece of wire, and a tube of superglue. He might try to fix his charger by:
Could he connect the broken wires of the charger together using the conductive metal wire, then glue it into the plastic straw to insulate the current?
*Note: DO NOT DO THIS. YOU WILL ELECTROCUTE YOURSELF.*
Due to an accident at the kinetic sand factory, Josie received the wrong product. Instead of sand, her bag was full of different particles mixed together. She wants to separate the particles into small bags based on type. To do so, she uses science to sort out the particles. She could...
Describe an experiment based on scientific principles. It could go something like:
Use magnets to separate out metal shavings and bits. Place the particles in water to see which sink or float to separate them by density. Dissolve them in solvents, then boil the solvent to isolate the particles. Heat the particles to see if some have lower melting points.
Doing these three things will help a soluble substance dissolve more/faster?
What are: Increasing temperature, stirring the solvent, and making the solute particles smaller (increasing surface area)?