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TLC Chemistry Test 2

TermDefinition
Atoms The smallest parts of an element that retains the chemical properties of an element.
Matter Anything that takes up space is composed of matter including atom and molecules.
Elements A type of pure substance that can't be changed into a simpler substance. It is also only made up of one type of atom.
Protons Positively charged molecules located in an atoms nucleus.
Electrons Negatively charged particles that orbit around the nucleus.
Democritus The first person to come up with the idea of atoms and to state that atoms are indivisible. He also said that dividing an object a multiple times will eventually lead you to an atom.
Dalton He proved Democritus's theory and he also added that atoms are to small to be seen with the naked eye.
Rutherford He used the gold foil experiment and found that atoms had a nucleus.
Thompson He was the scientist who came up with the plum pudding experiment to prove that electrons are negatively charged.
Bohr He stated that electrons orbited around the atoms nucleus. He also created the correct model of the atom.
Compound A type of substance that is composed of two or more elements that are chemically combined. It is only able to turn into a simpler substance by a chemical change.
Mixture A substance that is composed of two or more different physically combined and they keep there own physical properties.
Heterogeneous Mixture A mixture that is not the same throughout the mixture and the components of the mixture can be distinguished with the naked eye.
Homogeneous Mixture A mixture that retains the same physical properties throughout the mixture and can't be visually distinguished with the naked eye.
Physical Properties A property that can be studied and observed without changing the matter being studied.
Color (Physical Property) The color of a pigment in a substance.
Density (Physical Property) The property that describes the relationship between an objects mass and its volume.
Melting Point The temperature at which a pure substance melts.
Boiling Point The temperature at which a pure substance boils.
Chemical Properties Properties that can only be noticed when they undergo a change in chemical composition.
Ability to Burn A chemical process that involves an object or substance reacting quickly to oxygen and producing light and heat.
Ability to Rust A chemical process that involves an object or substance reacting slowly with oxygen.
Physical Changes When a substance changes from one state of matter to another and the composition of the object has not changed.
Changes in State of Matter When a substance changes from one state of matter to another.
Changes in Size or Shape When a substance changes from one size or shape to anothe
Chemical Changes The result of the formation of one or more new substances with new physical and chemical properties.
Color Change A chemical change in which a substance changes color the chemical making of a substance might have changed.
Temperature Change When a substance is combined with another substance there might be an increase or decrease in temperature.
Formation of a Precipitate A chemical change in which two substances are combined and a solid or a precipitate is formed.
Formation of a Gas A chemical change in which solids or liquids are combined they might form gas bubbles.
Period A horizontal row on the periodic table.
Atomic Number The atomic number represents the number of electrons and protons. Elements are arranged numerically by atomic number on the periodic table.
How to find the amount of neutrons Round the atomic weight to the nearest whole number. Subtract the atomic number from the rounded atomic weight.
Families Families are groups with similar properties.
Groups Columns on the periodic table.
Properties of Metals Luster- having shiny surface Conductors -heat and electricity to flow through them easily Malleable- the ability to be hammered into different shapes Ductile- the ability to be pulled into a wire like shape High Density- heavy for its size
Properties of Non-Metals Brittle- breaks easily Nonconductors- heat and electricity do not flow through them easily Dull- it lacks luster
Metalloids Elements that have the properties of metals and non-metals The metalloids are Boron, Silicon, Germanium, Arsenic, Tellurium, Polonium
Chemical Symbols They show the atoms of the elements composing a substance. Th first letter is always capitalized. No elements has the same symbol.
Subscript They show the number of each kind of atom in the compound.
Covalent Bonds A bond that contains two nonmetallic atoms.
Ionic Bonds A bond that contains one metallic atom and one nonmetallic atom.
Law of Conservation of Matter It states that the amount of matter doesn’t change during a chemical reaction the order is just rearranged. Another interpretation of the law is that matter can neither be created nor destroyed, but can be changed in form.
Yield The arrow that is used to distinguish between the reactants and products in an equation.
Reactant Substances that are broken apart or combined in a chemical reaction.
Product New substances that are formed in the chemical reaction.
Coefficient The number that comes before the chemical formula and shows the number of particles that participate in the reaction.
Acids An acid is something that falls between 1-6 on the pH scale.
pH Scale The pH scale is a tool that is used to measure how acidic or basic a solution is.
Base A base is a solution that falls between 8 and 14 on the pH scale.
Neutral Solution A neutral solution is not an acid or a base because on the pH scale it falls on 7.
Atoms have _____,________, and _______ protons neutrons electrons
The______ of the atom is located in the_____ with electrons moving in random patterns in the space around the nucleus. nucleus center
_______ can be separated by physical means such as filtration, sifting, or evaporation. Mixtures
_______ can only be made into simpler substances (elements) by chemical changes. Compounds
____ have a sour taste Acids
_____have a bitter taste Bases
If the indicator __________ turns a milky white when added to a substance, the substance is an acid. phenolphthalein
If the indicator phenolphthalein turns a ________when added to a substance, the substance is a neutral solution. light pink
If the indicator phenolphthalein turns a dark pink when added to a substance, the substance is ________. Bsae
_______ strips will turn varying shades of color ranging from a dark red to represent zero and a dark blue to represent 14. pH
Blue litmus paper turns red when the solution is an _____. Acid
____________ turns blue when the solution is a base. Red litmus paper
____________ are located on the right side of the yield sign. products
___________ are located on the left side of the yield sign reactants
If no subscript is shown then that means there is only ____ of that element one
The boiling point of pure water is ______°F or 100°C. 212
The melting point of pure ice is ________°F or 0°C. 32
Created by: RahJon