Magnets
Static
Electromagnetism
Mixture/Pure Substances
LCM/SOM/Properties
100
As distance increases between two objects, magnetic force ____________________.
decreases
100
Rubbing balloon on hair creates static charge due to the movemovent of electrons from _____ to _____.
hair to balloon
100
Current-carrying wires produce __________ fields
magnetic
100
Which is an example of a heterogenous mixture?
air c. chocolate milk
salt water d. fruit loops cereal with milk
fruit loops cereal with milk
100
Copper is used in electrical wiring and pots and pans to cook with. What property would best explain why?
conductivity because it is a physical property
200
As objects get closer together, what happens to the magnetic force?
increases
200
A positively charged rod comes near a metal sphere. What happens to the electrons on the sphere?
They move closer to the rod.
200
An electromagnet with twenty coils attracted more paper clips than one with 10 coils. Why?
Magnetic force increases with an increase in the number of wire turns
200
Pure Substance
200
The chemical equation shows only the reactants and one product.
2AlO → ? + O2
How many Aluminum (Al) atoms must be present in the products?
2
300
If you break a magnet is half, what happens to the poles?
Each piece gains a pole and 2 magnets are formed.
300
A negatively charged rubber rod touches an aluminum metal pie pan. How do the negative charges distribute themselves on the pie pan?
They spread out evenly on the surface
300
What will allow an easy flow of electrons?
conductors
300
Daniella wrote a table comparing pure substances and mixtures. What's wrong:
Wrong: Mixtures are chemically combined
300
Which of the following describes this reaction?
1. reaction between two compounds that results in a different compound.
2. reaction between two elements that results in a compound.
2. reaction between two elements that results in a compound.
400
The magnetic north points to geographic _____.
South pole
400
Which process charges a conductor by bringing it close to, but not touching, another charged object, followed by grounding?
induction
400
What are the THREE ways to make an electromagnet stronger?
increase: core, coils, power
400
Dirt is added to Beaker X and salt is added to Beaker Y. After combining, which statement is true of these mixtures?
1. Beaker X is heterogeneous Beaker Y homogeneous
2. Beaker X is homogeneous Beaker Y heterogeneous
Beaker X is a heterogeneous mixture and Beaker Y is homogeneous.
400
. How could you compare two compounds by using a chemical property?
Which one is more soluble in water.
Which one has a darker color.
Which one is more combustible.
Which one is more combustible.
500
Which situation is false?
the north pole of a magnet attracting iron filings
the south pole of a magnet repelling iron filings
the south pole of a magnet repelling iron filings
500
The move farther apart.
500
Magnetic compasses often mess up when near electrical power lines. Why?
- Too much power could prevent the compass from working well
Power lines produce a magnetic field that could prevent the compass from working well
Power lines produce a magnetic field that could prevent the compass from working well
500
Pure Substance of molecules.
500
Which statement is true about the Law of Conservation of Matter?
The products keep all chemical properties of the reactants.
The reactants have the same mass as the products.
The reactants have the same mass as the products.