Matter and Change
Measurements and Calculations
Atoms the Building Blocks of Matter
Conversions
Calculations and SI Prefixes
100
Define chemistry
What is "The study of the composition, structure, and properties of matter, the processes that matter undergoes, and the energy changes that accompany these processes."
100
What is the difference between weight and mass?
What is "mass is the same regardless of gravity, weight depends on the force of gravity.
100
Write one method of designating isotopes?
What is "Nuclear Symbol or Hyphen Notation"
100
What is the mass of 1.5 mol of sodium?
What is " 24.5 grams "
100
How many neutrons are present in an atom of tin that has an atomic number of 50 and a mass number of 119?
What is "69 neutrons"
200
What device was used in the process of discovering the electron ? And by who?
What is J.J Thompson used an object called the cathode ray to discover the electron.
200
What was the significance of a cathode-ray tube?
What is "Cathode-ray tubes supplied evidence of the existence of electrons, which are negatively charged subatomic particles that have relatively little mass."
200
What the most common isotope of Hydrogen?
What is "Protium"
200
What is the mass in grams of copper with 3 mol?
What is " 3mol * 63.55g/mol = 190.65 g of copper "
200
Which of the following masses is the largest, 0.200g, 0.02kg, 20mg, or 2000micrograms?
What is "0.02kg"
300
Which of the following is a heterogeneous mixture? a. sugar b. sugar in water c. samples of nitrogen and oxygen in the same container d. samples of argon and iron in the same container
What is "samples of argon and iron in the same container."
300
a theory differs from a hypothesis in that a theory...
What is " has been subjected to experimental testing"
300
What is molar mass?
What is "The mass of one mole of a pure substance"
300
How many moles of carbon are in a 28 gram sample?
What is "2.33 mol"
300
A measurement of 23456mg converted to grams equals...
What is "23.465 grams"
400
Magnesium reacts with Hydrochloric acid to produce magnesium chloride and hydrogen gas. The reactants in this rxn are...
What is " magnesium and hydrochloric acid."
400
All measurements in science have some degree of ...
What is "uncertainty"
400
What are the primary components of an atom and their charges, as well as their respective locations?
What is "The primary components of an atom including the following: protons(with a positive charge), neutrons (with a neutral charge), and electrons(with a negative charge). The protons and neutrons are considered to be located in the nucleus, while the electrons are viewed to settle outside the nucleus in an outer cloud/region."
400
Which atom has more neutrons, potassium-40, or argon-40?
What is "Argon-40 has 22 neutrons (40-18=22), and potassium-40 has 21 neutrons (40-19=21), so Argon-40"
400
A metal sample has a mass of 45.65 grams, a volume of 16.9 cm cubed, what is its density?
What is "2.7 g/cm cubed"
500
We know that air is a mixture and not a compound because...
What is "it's composition can vary"
500
Which of the following is not part of the scientific method? a. making measurements b. introducing bias c. making an educated guess d. analyzing data
What is " introducing bias "
500
A chemical compound always has the same elements in the same proportions by mass regardless of the source of the compound. This is a statement of...
What is "the law of definite proportions"
500
What is the mass of 1.2 x 10^23 atoms of phosphorous?
What is "6.17 grams"
500
A recipe for18 cookies calls for 1 cup of chocolate chips. How many cups of chocolate chips are needed for 3 dozen cookies? What kind of proportion, direct or indirect, did you use to answer this question?
What is "2 cups, direct proportion"
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