Physical Science Flashcards
what are the three changes in matter ?
boiling, condensation, evaporation
what are the two different types of mixtures?
homogeneous and heterogeneous
what does homogeneous mixture mean?
you can not see the different parts of the mixture. ex, coffee, creamer
what does heterogeneous mixture mean?
you can see the different parts of the mixture. ex, chicken noodle soup
values less than 7 on a ph scale are…
acidic
values greater than 7 on a ph scale are…
alkaline (base)
what is the smallest part of an element?
atom
what are electrons?
negatively charged particles
what are nuetrons? where are they located?
neutrally charged particles that are located in the atoms nucleus
what are protons? where are they located
positively charged particles that are located in the atoms nucleus.
what is an atomic number?
how an element is identified. it’s the number of protons in the nuclei
do groups on a periodic table go vertically or horizontal?
vertical
what is the smallest particle in a chemical element or compound?
molecule
what are ions?
charged elements or molecules that have lost or gained one or more electrons
what is an isotope?
two or more forms of the same element that have the same number of protons but different neutrons
what is density?
the amount of matter an object has to its volume
what is kinetic energy?
object is in motion
what are the different types of energy?
mechanical, electrical, chemical and thermal
what does mechanical energy do?
objects in motion
what does electrical energy do?
moves through wires
what does chemical energy do?
reaarangment of moecular structure
what does thermal energy do?
moving particles by heat
what is heat transfer?
the exchange of thermal energy between physical systems
what are the three different types of heat transfer?
convection, conduction, and radiation
what is convection? think of convection oven
transfer of heat by the movement of warmed matter
what is conduction?
transfer of hear from particle to particle
what is radiation heat?
transfer of hear from elctromagnetic waves
how many different types of circuits are there?
2
what is a series circuit?
components are arranged end to end
what is a parallel circuit?
a circuit with branches that allows multiple applications to happen at one time
what are good conductors for electricity ?
wire, metal, water
cloud-to-ground lightning occurs between what?
opposite charges between thunderstorm cloud or between cloud and ground
what does dependent variable mean?
what is being measured
what does independent variable mean?
what is being tested, what is being manipulated
