Chem Fundamentals
The statement that cannot be considered a scientific hypothesis:
What is "Every human being has a soul?"
The element not paired with its correct symbol?
What is P, Potassium?
*Should be K, Potassium!
Antimony has an atomic number of 51 and a mass number of 121. How many electrons does this stable, uncharged atom contain?
What is 51?
Determine the density of an object that has a volume of 4.5 mL and a mass of 19.5 g.
What is 4.333 g/mL?
In the periodic table, the elements are arranged in ________.
What is "order of increasing atomic number?"
The physical state in which matter has a specific shape and a specific volume:
gas
solid
liquid
plasma
What is a solid?
The noble gas from this list of elements:
What is Xenon (Xe)?
In order for the element of magnesium (Mg) to achieve a full octet of electrons (8 valence electrons) or a noble gas configuration of electrons, how many electrons must it lose to become an ion?
What is 1 electron?
The temperature in Hooksett may get up to 59oF. What is that in Celsius?
oC = (oF - 32) / 1.8
What is 15oC?
Of the choices below, which one is not an ionic compound?
What is PCl5?
The one that is a physical change:
~dissolution of a penny in nitric acid
~the formation of polyethylene from ethylene
~the condensation of water vapor
~the rusting of iron
~a burning candle
What is "condensation of water vapor?"
The metal from this list of elements:
What is Sodium?
How many valence electrons does an atom of chlorine have?
What is 7?
If 40.27 g of sucrose, C12H22O11, are dissolved in enough water to make a 0.10 L solution, what is the molarity? [M = moles/L]
What is 1.2 M?
Which has a greater mass?
What is "1 atom of iron?"
Classify each choice as either element, compound, heterogeneous mix, or homogeneous mix:
Air: homogeneous mix
vegetable salad: heterogeneous mix
sugar: compound
argon gas: element
The subatomic particle that causes isotopes of Sr-87 and Sr-90 to have different uses and masses.
What is a neutron
If sodium (Na), that forms a +1 cation, forms an ionic bond with sulfur (S), that forms a -2 anion, the chemical formula with both will be...
What is Na2S
Which length is larger? Use dimensional analysis to defend your choice (or rather, change all the units to be the same):
What is 4500 cm?
When the equation
NH3 + O2 -> NO + H2O
is balanced with the smallest set of integers, the sum of the coefficient is?
What is 19?
Rank the types of visible light in order of increasing energy: yellow, blue, violet, green, red, orange.
What is Red, Orange, Yellow, Green, Blue, Violet?
What are the three types of subatomic particles found in all elements? What are the major differences between them (charge, location, and relative mass)?
protons: positive charge, in center nucleus, mass of 1 amu
neutrons: neutral charge, in center of nucleus, mass of 1 amu (similar to proton)
electrons: negative charge, outside of nucleus, very small mass compared to others.
Explain the differences between ionic, covalent, and metallic bonds (what types of elements are commonly in these bonds and how are the electrons dealt with for each). Give an example of each.
Ionic bonds transfer electrons, made of metal and nonmetal elements, CaCl2.
Covalent bonds share electrons, made of nonmetals only, CO2.
Metallic bonds have a sea of non-localized electrons that are shared by all, made of metals only, Cu.
The number of oxygen atoms in 40. grams of sulfur dioxide, SO2?
What is 7.5 x 1023 oxygen atoms?
___ C2H4 + ___ O2 -> ___ CO2 + ___ H2O
After balancing the chemical reaction above, the grams of CO2 are produced from 3.0 grams of C2H4 and excess O2.
What is 9.4 g CO2?