science Flashcards
what causes lightning
the negative charged at the bottom of a cloud are attracted to the positive charges on the ground .
what is static electricity
term referring to electric charges that are stationary, or at rest
how do you find the number of neutrons
atomic mass - number
how do you find the valance electrons
atomic number - group number . If the atomic number is too small then that is the number of valance electrons
what is contact
Electrons get passed from one object to the other when they touch
what induction
Electrons in the object move away or towards another charged object that is placed close to it.
term referring to matter having an excess of electrons (a negative charge) or a deficiency of electrons (a positive charge)
charged
a property of matter having an excess of electrons (a nega¬ tive charge) or a deficiency of electrons (a positive charge)
electric charge
term referring to electric charges that are stationary, or at rest
static electricity
term referring to matter having neither a negative nor a positive electric charge
neutral
a material that does not allow electric charges or heat to move freely on or through it
insulator
a material that allows electric charges or heat to move freely on and through it
conductor
a law stating that like electric charges repel and unlike electric charges attract
Law of Attraction and Repulsion
charge carried by protons
positive charge
what causes lightning
when the amount of charge becomes too much in the clouds the air is not in a position to hold onto the charge .
The negative charges at the bottom of the cloud attract to the positive charges on the ground .
why isnt it safer in a field
because there is no conductor in a field for the electricity to move through so if you get struck the electricity is moving througout your body
how does an electroscope charge by induction
iSince opposites attract, a countless number of negatively charged electrons are drawn upwards towards the top of the electroscope.
what is an electric charge
a form of change either positive or negative that exerts an electric force
a pure substance that is made up of 2 or more elements that are chemically combined .
compound
is tomato soup a homogenous or a heterogenous mixture ?
homogenous because it looks like one thing yet is a mixture of different things
a homogenous mixture mixture is also known as a mechanical mixture
false , heterogenous mixtures would be a good example of a mechanical mixture because it doesn’t look like one substance
what does the particle theory of matter state ?
- all matter is made up of small particles
- these particles have an attraction force between them
- When particles are heated they move faster
is a mixture of different and easily distinguishable materials
heterogenous mixture
what is current electricity
Electric current is the movement of electrons through a wire. Electric current is measured in amperes (amps) and refers to the number of charges that move through the wire per second.
For plants to make seeds , the pollen from the _____– of one flower needs to fertilize the ovule of another flower.
Anther .
4 critters that are pollinators
bees , flies , hummingbirds and , moths and bats
