Chemistry 1
The 17th row on the periodic table contains these elements
Halogens
Static electricity can be described as
An imbalance of electrical charge on the surface of an object
Static means that the electrons are not constantly flowing
What is pollution?
Pollution is the release of toxic chemicals into the environment.
Pure elements contain how many atoms
one
Why do we use lightning rods?
Provide a safe path for lightning to follow to the ground.
This group of elements can be described as the most stable on the periodic table
Noble gases
The first two laws of electrical charge are: like charges repel, opposite charges will attract. What is the third law?
Charged and neutral objects are attracted to each other
Why does bioaccumulation not negatively affect organisms lower on the food chain?
Organisms lower on the food chain aren’t affected because the concentrations of chemicals they see are much lower.
What is denser, water or ice?
Ice
Why is a short circuit dangerous?
It will cause a sudden and dramatic change in electrical resistance. It can cause a fire, or damage to the components of the circuits.
The change of gas to solid is called
deposition
What is the difference between charging by temporary induction, compared to charging by permanent induction
- Temporary induction is when a charged object is brought near a neutral object, but no contact is made.
-Connecting an object to a large body, like the earth, can remove the charge(grounding).
What does CHIPPO stand for
Climate change, habitat loss, invasive species, pollution, population, overharvesting
This group of elements are rarely found in their elemental form and are often compounds with the alkali metals
Halogens
What is the difference between AC and DC
DC:
A flow of electrons in one direction through an electric circuit
Electrons move from the negative terminal and come back through the positive terminal.
AC:
Electrons move back and forth, alternating their direction in an electric circuit.
Alternate current is produced by generators at electric generating stations.
Transformers allow the voltage to change, so the electrons are more/less charged depending on at which point of the circuit they are at.
This is an admixture of metals or a metal combined with one or more other elements.
an alloy
Who invented Voltaic cells?
1800: Alessandro Volta, Italian physicist
How do animals and oxygen/carbon dioxide interact?
Animals breathe in oxygen to survive and release carbon dioxide (cellular respiration)
Freezing point, density, melting point, and boiling point are called this type of property.
Characteristics Physical properties
What is the definition of potential difference, and what is it measured in?
The difference in electrical potential energy per unit charge is measured at 2 different points.
It's measured in volts
This physicist discovered the neutron in the nucleus of the atom
If the first and third lights on a parallel circuit stop working, will the second still work?
Yes
Why is sunlight important for the biosphere?
Sunlight is important for the biosphere because it warms the atmosphere, evaporates water, produces winds, and keeps Earth’s surface warm. Sunlight is also needed for photosynthesis. Life exists in the biosphere because of the things provided by the Sun.
the fourth shell of the contains a maximum of how many neutrons
32
Why do we use AC current to power the school?
Because, Transformers allow the voltage to change, so the electrons are more/less charged depending on at which point of the circuit they are at.