In the laboratory, volumes of liquid are usually measured with a
What is a graduated cylinder
100
A summary of what you have learned from a scientific experiment is called a
What is a conclusion
100
Each group in the periodic table has its own characteristic properties based on the number of
What are valence electrons
100
Anything that has mass and takes up space is considered
What is matter
100
A material used to increase (speed up) the rate of a chemical reaction is a
What is a catalyst
200
The formula to calculate density
What is M/V
200
A statement that describes what scientists expect to happen every time under a particular set of conditions and has been proven is a
What is a scientific law
200
The atomic number is the number of
what are protons
200
The smallest particle of an element is called an
What is an atom
200
A chemical reaction that absorbs energy in the form of heat is described as
What is endothermic
300
The measurement of how much matter an object contains is its
What is mass
300
During an experiment, if you purposely change the temperature to test a hypothesis, the temperature is called the
What is the manipulated (independent) variable
300
A row across the periodic table is called a
What is period
300
Electrons involved in bonding between atoms are named this
What are valence electrons
300
A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be
What is balanced
400
The volume of an irregular object (like a rock) can be measured by
What is water displacement
400
An answer to a scientific question or a possible explanation for a set of observations is called
What is a hypothesis
400
A typical atom of sodium has 11 protons, 12 neutrons, and 11 electrons. What is the atomic mass of sodium?
What is 23
400
In an atom, the number of protons equals the number of
What is electrons
400
The only thing that ALWAYS takes place in a chemical reaction
What is the formation of a new substance
500
The measurement of how much mass is contained in a given volume is called
What is density
500
Convert the following: 635.76 cm = __________m
What is 6.3576 m
500
The noble gases helium, neon, argon and krypton are all located in group or family 18 of the periodic table. What can you predict about these elements, based on their group?
What is they are nonreactive
500
What happens when chemical bonds break and new bonds form?
What is a chemical change
500
Increasing the concentration of a reactant in a chemical reaction will