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Wood Science Midterm Flash Cards
Terms in this set (100)
A _______ is a possible explanation for a problem using what you know and what you observe.
A(n) _______ occurs when what the scientist expects changes how the results are viewed.
A(n) ______ represents an idea, event, or object in order to help people better understand it.
Graphing data can help you to recognize ________.
The application of scientific knowledge to benefit people is _______.
The amount of space occupied by an object is it's ______.
A testable prediction is a(n) _______.
When designing an experiment, the first step is to ________.
State the problem
A standard for comparison that helps to ensure that the experimental result is caused by the condition being tested is the _______.
A factor that changes in an experiment from manipulation of the independent variable is the _______.
A factor that does not change in an experiment is the ________.
An organized process used to gather observations and test a hypothesis is a(n) _______.
A statement that describes what happens in a nature is a __________.
An explanation of an event that is based on repeated observations and experiments is a _______.
The correct symbol for the SI unit of temperature is ________.
The type of graph that would be used to show how some fixed quantity is broken down into parts is a ________.
In a graph, the variable on the horizontal axis is the _______.
A unit of measurement that is obtained by by combining other units is a _________ unit.
Matter with no definite volume and no definite shape is a ____________.
A gas-like mixture with no definite volume or shape that is made up of positively and negatively charged particles is a _________.
Matter that has a definite volume and a definite shape is a ___________.
Matter in which particles are arranged in repeating geometric patterns is a ___________.
The most common state of matter in the universe is ________.
As a sample of matter is heated, it's particles ___________.
Move more quickly
Matter that has a definite volume but no definite shape is a
Matter in which the particles are free to move in all directions until they have spread evenly throughout their container is a _____________.
All substance are built form ___________
About __________ elements are found on Earth
A(n) __________ is a homogeneous mixture of particles so small they cannot be seen without microscopes and will never settle to the bottom of their container.
A(n) _________ is a mixture that settles upon standing.
A(n) ___________ is a mixture that does not scatter light.
Any characteristic of a material that you can observe without changing the identity of the substances that make the material is a(n) __________.
A change in size, shape, or state of matter is called a(n) ___________ change.
The process for separating substances in a mixture by evaporating a liquid and recondensing it's vapor is called _____________.
A(n) ___________ is not homogeneous.
The scattering of light by colloids is called ____________.
The Tyndall effect
Smoke is an example of a ___________.
Three examples of physical changes are ____________.
Boiling of water, bursting of a balloon, and melting of a candle.
The color of ink is a ___________.
When two or more substances are combined so that each substance maintains it's own properties, the result is a(n) _________.
When gasoline is burned in an engine, _________.
New substances are formed
__________ is another name for a homogeneous mixture.
A(n) _________ is matter that is composed of one type of atom.
The smallest piece of an element that still retains the properties of the element is a(n) __________.
The nucleus of an atom is __________ charged.
Neutrons have ________ charge.
Electrons have ________ charge.
Protons have ________ charge.
Each energy level of an atom has a maximum number __________ it can hold.
Dot diagrams are used to represent ___________.
Particles of matter that make up protons and neutrons are ___________.
A chemical symbol represents the _________ of an element.
Horizontal rows of the periodic table are called __________.
Atoms of the same element with different numbers of neutrons are called __________.
Elements in groups 3 through 12 are called __________.
A certain atom has 26 protons, 26 electrons, and 30 neutrons. It's mass number is ___________.
The process by which a solid changes directly to a gas without first becoming a liquid is called __________.
Different forms of the same element that have different properties because of different atom arrangements are called ____________-.
At room temperature, most metals are ___________.
An allotrope of carbon that is hard and is often ised in jewelry is ________.
Metals can be used as wire because they are ___________.
Substances that conduct an elect current only under certain conditions are most likely to be ______________.
The elements in group 3 through 12 of the periodic table are the _____________.
A group of elements that have two electrons in it's outer energy level is the ________________.
Alkaline earth metals
Copper, sulfur, and oxygen are examples of ___________.
A chemical __________ tells what elements a compound contains and the exact number of the atoms of each element in a unit of that compound.
H2O is also known as ______________.
A chemical __________ is the force that holds atoms together in a compound.
A charged particle is known as a(n)
The attraction that forms between atoms when they share electrons is known as a(n) __________ bond.
What is the correct formula for magnesium nitrate?
How many potassium atoms and how many oxygen atoms are there in a binary compound made from these two elements.
Two potassium and one oxygen
What is the correct formula for magnesium oxide is?
What is the correct name for K2SO4?
A group of atoms that act together as one charged atom is a _____________.
In chemical formulas, the number of atoms in a unit of the compound is shown by numbers called _____________.
Numbers to the left of formulas for reactants are called ___________.
A(n) _____________ chemical equation has the same number of atoms of each element on both sides.
Substances that prevent certain chemical reactions are called _________________.
When one element replaces another element in a compound, the reaction is a ____________ reaction.
Each substance to the right of the arrow in a chemical equation is a ___________.
A chemical reaction in which the energy released is primarily in the form of heat is ______________.
A substance that speeds up a chemical reaction without undergoing a permanent change itself is a(n) __________.
Numbers that precede symbols and formulas in a chemical equation are called _____________.
A chemical reaction in which two or more substances combine to form another substance is a __________ reaction.
The breaking down of a substance into two or more substances is ______________.
If energy in the form of heat is required for a chemical reaction to take place, the reaction is ______________.
An example of a balanced chemical equation is ____________.
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare with the mass of the reactants?
The masses are equal.
What type of reaction is shown in the chemical equation NH3+HCI,--->NH4CI?
In a solution, the substance that is being dissolved is the ____________.
__________ is the maximum amount of a solute that can be dissolved in a given amount of solvent at a given temperature.
Increasing the surface area of a solid ____________.
Increases the speed of dissolving.
Which of the following types of solutes dissolves well in water?
A solution that contains all the solute it can at a given temperature is called _____________.
A strong base __________ in solution.
When a strong acid dissolves in water, __________ the acid molecules dissolve into ions.
A substance that produces H+ ions in solution is a(n) ______________.
A substance that produces OH_ ions in solution is a(n) ______________.
A compound formed in solution from the negative ion of an acid and the positive ion of a base is a _____________.
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