(T/F) Compounds are formed when atoms of more than one element combine.
What is true?
100
JJ Thompson used this piece of apparatus to discover the electron.
What is a cathode ray tube?
100
This law states that atoms are neither created or destroyed in a chemical reaction.
What is the Law of Conservation of Matter?
100
If 99% of an isotope of element X has a mass of 4 amu and the other 1% of element X is an isotope that has a mass of 2amu. Tha average atomic mass would be closest to
A) 3 B) 2 C) 4 D) 1
What is "C"?
200
He discovered the charge of an electron.
Who is Robert Millikan?
200
(T/F) An compound always has a constant composition
What is true?
200
Rutherford "shot" helium nuclei at gold foil. These nuclei are known as ..
What are alpha particles?
200
Nitrogen monoxide has a nitrogen: oxygen mass ratio of 14:16. This is an example of this law.
What is the law of Conatant Composition or Definite Proportions?
200
This pair constitutes isotopes of the same element
A) 12/6 X and 14/6 X
B) 12/6 X and 12/7 x
What is "A"?
300
He dicovered the nucleus with "Gold Foil"
Who is E. Rutherford?
300
Dalton said that all atoms of the same element are identical but he was unaware of the existance of these.
What are isotopes?
300
Milikan did this experiment o determine tha charge of an electron.
What is the "Oil Drop Experiment"?
300
The ratio of oxygen in NO & NO2 is 1:2.
What is the Law of Multiple Proportions?
300
Wavelength is _____ proportional to energy
What is inversely proportional?
400
This scientist discovered 2 elements: Ra & Po
Who is Marie Curie?
400
Dalton said that atoms are not changed by chemical reactions. Later we discovered that atoms can change in this type of reaction.
What is a nuclear reaction.
400
JJ Thompson's model is known as the...
What is the "Plum Pudding Model"?
400
Which of the following exhibits the law of multiple proportions. A) Co & CO2 B) CO & CO2 C) CO2 & NO2
What is "B"?
400
Energy and Frequency are __________ proportional.
What is directly proportional?
500
This scientist put the electrons in specific energy levels or orbits.
Who is Niels Bohr?
500
(T/F) Dalton said that atoms combine in simple whole # ratios.
What is true?
500
When you make a belief statement based on indirect observations.
What is an inference?
500
Atomic Mass Units (amu's) are this "kind " of mass.
What is relative?
500
Which is in order of increasing frequency?
A) gamma, U.V, Visible, I.R., Radio
B) Microwave, U,V. X-ray
C) Gamma, I.R., U.V.