That two elements can react to form more than one compound, but a fixed mass of one element will react with masses of the other element in small, whole number ratios is stated in the: Select the correct answer below: law of conservation of matter law of conservation of energy law of definite proportions law of multiple proportions
Dalton's theory views a chemical change as: Select the correct answer below: a loss of mass a gain of mass a rearrangement of atoms a transformation of atoms of one element to atoms of another element.
Dalton's atomic theory served to explain: Select the correct answer below: the law of conservation of matter the law of definite proportions the law of multiple proportions all of the above
Whose view that matter is infinitely divisible was considered correct for most of the last two millennia? Select the correct answer below: Democritus Einstein John Dalton Aristotle
Which of the following is true according to Dalton's atomic theory? Select the correct answer below: Atoms cannot be created or destroyed. Atoms of the same element will have differing sizes and masses. Elements can consist of many types of atoms. All of the above are true.
According to Dalton, atoms are all: Select the correct answer below: indivisible identical in size divisible identical in mass
Given the following reaction: 8CO + 17H2 → + . Which of the following are products that do not violate any of Dalton's postulates? Select the correct answer below: CH18 + 8H2O CH + HO CH10 + H2O C8H18 + 8H2O
Given a reaction in which one tin atom that is bonded to two oxygen atoms reacts with 4 hydrogen atoms, which of the following products do not violate any of Dalton's postulates? Select the correct answer below: A tin atom and 2 molecules containing two hydrogen atoms bonded to one oxygen atom Two tin atoms A tin atom and 6 molecules containing two hydrogen atoms bonded to one oxygen atom none of the above
A sample of an unknown substance contains 1.0 grams of copper and 0.558 grams of chlorine, while a different sample of that same substance contains 2.0 grams of copper and 1.116 grams of chlorine. Which law does this observation demonstrate? Select the correct answer below: the law of definite proportions the law of multiple proportions it demonstrates both of the above laws it does not demonstrate any law
One 100 g sample comprised of molecule (A) is made up of 57.1 g of oxygen and 42.9 g of carbon. Another 100 g sample comprised of molecule (B) is made up of 72.7 g oxygen and 27.3 g carbon. How does the oxygen to carbon mass ratio for molecule A compare to the oxygen to carbon mass ratio for molecule B? Select the correct answer below: 1 : 2 1 : 3 3 : 4 2 : 2
Which two subatomic particles would have a combined unit charge of 0 ? Select the correct answer below: proton, neutron proton, positron neutron, electron electron, proton
What did Ernest Rutherford's work uncover? Select the correct answer below: the existence of an electron the fundamental charge the mass of an electron an improved model of the atom
Millikan utilized specific numerical data gathered by: Select the correct answer below: J.J. Thomson John Dalton Ernest Rutherford all of the above
Use the image below to answer the question that follows. Which of the following correctly identifies A in the image above? Select the correct answer below: protons neutrons electrons nucleus
Which of the following was Robert A. Millikan able to determine, either from his own work, or by building on the work of J. J. Thomson? Select all that apply. Select all that apply: The existence of an electron The charge of an electron. The mass of an electron The model of an atom with a small, positively charged nucleus.
In Ernest Rutherford's gold foil experiment, why did alpha particles sometimes ( 1 in 8,000 ) fly violently in a random direction? Select the correct answer below: The negative alpha particles were perfectly aligned to strike a nucleus The alpha particles move erratically naturally The positive alpha particles were perfectly aligned to strike a nucleus none of the above
The charges on the proton and electron are typically measured in: Select the correct answer below: volts amperes coulombs daltons
The prefix "sub" in subatomic tells us that subatomic particles are: Select the correct answer below: particles made of atoms the basic building blocks of atoms particles of similar size to atoms particles that power nuclear submarines
Which of the following is used to abbreviate an element or an atom of a given element? Select the correct answer below: the mass number the atomic mass the chemical symbol the atomic number
Which of the following is the chemical symbol for carbon monoxide? The carbon monoxide compound contains one carbon and one oxygen atom. Select the correct answer below: CO co Co cO
Which of the following are chemical symbols that correspond to elements found on the periodic table above? Select all that apply. Select all that apply: O He F Ua
How many carbon atoms are there in the empirical formula corresponding to C10H22O2? Provide your answer below:
Two molecules with the same structural formula must have: Select the correct answer below: the same types of atoms but in any number the same number of atoms but of any type the same type of atoms in precisely the same number no correlation
Molecules that have the same structural formula will have the same: Select the correct answer below: empirical formulas molecular formulas molecular masses all of the above
Cyclobutane consists of 4 atoms of carbon and 8 atoms of hydrogen. What is cyclobutane's empirical formula? Please write the empirical formula using subscripts where needed. Provide your answer below:
A molecule of dinitrogen tetroxide consists of 2 nitrogen atoms and 4 oxygen atoms. What is dinitrogen tetroxide's empirical formula? Provide your answer below:
The structural formula for a molecule is different from its molecular formula in that: Select the correct answer below: The structural formula is used as an abbreviation for the names of compounds. The structural formula uses chemical symbols and numbers. The structural formula shows how the atoms are connected. All of the above.
Use the image below to answer the question that follows. What information is provided by the structural formula for propane shown above? (Select all that apply). Select all that apply: the type of atoms in propane the number of atoms in propane how the atoms are connected in propane a 3-D representation of the atoms in propane
When comparing lithium, sodium, and potassium to calcium, strontium, and barium, early chemists noticed that: Select the correct answer below: the elements in the first list are much less reactive the elements in the first list are much more reactive these all have identical reactivity these are all completely unreactive
When comparing lithium, sodium, and potassium to calcium, strontium, and barium, early chemists noticed that: Select the correct answer below: the elements in the first list are much less reactive the elements in the first list are much more reactive these all have identical reactivity these are all completely unreactive
The periodic table is arranged by increasing: Select the correct answer below: reactivity atomic mass atomic number number of neutrons
Which of the following is a correct statement about different elements that are in the same group in the periodic table? Select the correct answer below: They have the same atomic number. They have different chemical properties. They are in the same column of the periodic table. They are in the same row of the periodic table.
Which of the following is NOT true of Mendeleev? Select the correct answer below: He organized the periodic table in order of increasing mass. He left blank spaces in the periodic table for the possibility of undiscovered elements. He organized his table in rows and found that related elemental properties were near each other vertically. He discovered elements of the transition metal periods only.
Which of the following is true regarding the periodic table? Select the correct answer below: Mendeleev's periodic table predicted the existence of undiscovered elements. Dmitri Mendeleev's periodic table was soon replaced by Lothar Meyer's. The periodic table was first organized by decreasing atomic mass. All of the above are true.
Which of the following scientists published tables with the elements arranged according to increasing atomic mass? Select all that apply. Select all that apply: John Dalton Dmitri Mendeleev Lothar Meyer Antoine Laurent Lavoisier
The idea that elements exhibit recurring properties is called: Select the correct answer below: recurrence chemical law periodic law none of the above
Another word for period is: Select the correct answer below: series group section family
The atomic masses on the periodic table are listed in: Select the correct answer below: atomic mass units grams picograms pounds
The symbol Po refers to: Select the correct answer below: potassium phosphorus polonium plutonium
The section of the periodic table that consists of ten groups is called the: Select the correct answer below: metals nonmetals transition metals actinides
Which element is an example of a halogen? Select the correct answer below: neon iodine xenon beryllium
The lanthanides and actinides belong between: Select the correct answer below: the alkaline earth metals and the transition metals the alkali metals and the alkaline earth metals the halogens and the noble gases the pnictogens and the chalcogens
Elements in group 2 are: Select the correct answer below: metalloids metals nonmetals all of the above