Chemistry is defined as the study of the composition and structure of materials and...?
the changes in matter
100
What is an atom?
the smallest unit of an element that maintains the properties of that element
100
The reason for organizing, analyzing, and classifying data is...?
to find relationships among the data
100
What is quantity?
something that has magnitude, size, or amount
100
The law of conservation of mass follows from the concept that....?
atoms are indivisible
200
The branch of chemistry that is concerned with the identification and composition of material is...?
analytical chemistry
200
What is a reactant?
Physical means that can be used to separate
200
Quantitative observations are recorded using...?
numerical information
200
What is hypothesis?
a testable statement
200
Experiments with cathode rays led to the discovery of the...?
electron
300
What is basic research?
Basic research is carried out for the sake of increasing knowledge.
300
What is a nonmetal?
an element that is a poor conductor of heat and electricity
300
A plausible explanation of a body of observed natural phenomena is a scientific...?
a.) law
b.) theory
c.) principle
d.) all of the above
b.) theory
300
What is a significant figure?
any digit in a measurement that is known with certainty plus one final digit, which is somewhat uncertain or is estimated
300
Isotopes of an element contain different numbers of....?
nuetrons
400
Applied research is....?
a form of systematic inquiry involving the practical application of science
400
What is physical properties?
a characteristic that can be observed or measured without changing the identity of the substance
400
Which of these is not an example of unit...?
a.) weight
b.) gram
c.) teaspoon
d.) kilometer
a.) weight
400
What is SI?
the measurement system accepted worldwide
400
All isotopes of hydrogen contain...?
one proton
500
Physical means can be used to separate?
mixtures
500
What is heterogeneous?
not having a uniform composition throughout
500
The number of grams equal to 0.5 kg is...?
500.
500
What is percent error?
a value calculated by subtracting the experimental value from the accepted value, dividing the difference by the accepted value, then multiplying by 100
500
The total number of protons and neutrons in the nucleus of an atom is its...?