Chemistry
is the type of change that happens when chemical bonds break and new bonds form (or a new substance)
what is a chemical change?
they are chemicals that act as biological catalysts by speeding up reactions in living things
what are enzymes?
is the type of plate boundary where the sea-floor spreading occurs
what is divergent?
is a group of elements that does not form compounds with other elements
what are the noble gases?
is the element that comprises most of the mass of the sun
what is hydrogen?
is an example of a chemical change
what is burning something? or formation of a gas, a new color, heat is produced, light is produced...
is the SI unit for force
what is Newton?
is the organelle where the cellular respiration takes place
what is the mitochondria?
is the maximum number of valence electrons that an element can have
what is 8?
is the tide with the least difference between consecutive low and high tides.
what is a neap tide?
is the only sure evidence for a chemical reaction
what is a new substance?
is the term used for describing a model of the universe in which Earth is at the center of the revolving planets and stars
what is geocentric?
is the moon phase in which a lunar eclipse happens
what is a full moon
is the most abundant metalloid in Earth's crust
what is silicon?
Is the number of waves that pass a given point in a certain amount of time.
what is frequency?
the substances listed on the left side of a chemical equation
what are the reactants?
Earth's atmosphere is composed of about 78 percent of this element
what is nitrogen?
is an example of a greenhouse gas
what is carbon dioxide?
Na2O has how many atoms of Sodium?
what is 2?
They are loose collections of ice , dust , and small rocky particles whose orbits can be very long.
what is a comet?
it says : matter is not created nor destroyed
what is the law of conservation of mass?
it has the longest wavelength in the electromagnetic spectrum
what is radio waves?
is the unit used to measure distance in space
what is an astronomical unit?
is the name of the compound with the following chemical formula: KF
what is potassium fluoride?
Term describing a model of the solar system in which Earth and the other planets revolve around the sun
what is heliocentric?