Science -The Basics
This is a possible, testable explanation for one or more observations or a a suggested, testable answer to a question.
What is a hypothesis?
A state of matter that has no definite shape but has a definite volume.
What is a liquid?
This is the center of an atom.
What is the nucleus?
This a a force of attraction between different kinds of molecules so that they stick together?
What is adhesion?
This is a chemical reaction that releases energy to its surrounding.
What is an exothermic reaction?
This is an observation that is measurable such as amount, height, length, weight, etc.
What is quantitative observation?
This is the smallest particle of an element.
What is the atom?
This is a subatomic particle that has negative charge and that is found outside the nucleus of an atom.
What is a electron?
What is a electron?
Atoms with a positive charge are called this.
What is a cation?
This is a chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light.
What is a combustion reaction?
This is an investigation in which all variables except one remain the same.
What is a controlled experiment?
This is a substance that is dissolved in a solution.
What is a solute?
This is the sum of the protons and neutrons in the nucleus of an atom.
What is mass number?
These are chemical bonds formed between opposite charged ions.
What are ionic bonds?
This is a measurement used to count atoms, ions or molecules and is also known as Avogadro’s Number.
What is a mole?
This is the prefix, number and symbol for a kilogram.
What is Kilo, 1000, K?
This is a homogeneous mixture made by dissolving one substance in another.
What is a solution?
This is an electron that is in the highest energy level or furthest from the nucleus.
What is a valence electron?
These are substances that undergo a chemical change.
What are reactants?
This is a chemical change in which one element replaces a second element in a compound.
What is a single replacement reaction?
A concise statement that summarizes the results of many observations and experiments.
What is scientific law?
This is a ratio of the mass of the substance to the volume of the substance.
What is density? D=M/V
These are atoms of an element with the same number of protons but different number of neutrons.
What are isotopes?
These numbers appear before a formula in a chemical equation to show the relative proportions of each reactant and product.
What is a coefficient?
This is a chemical reaction that breaks down compound into simpler parts.
What is a decomposition reaction?