Chem Exam 1
A piece of aluminum weighing 10.0 grams is placed into a graduated cylinder that has an initial volume (before immersion) of 35.0 mL. After immersion, the volume on the cylinder reads 38.7 mL. What is the density of the metal sample?
2.70 g/ml
How many different elements are in the compound C6H12O6
3
Which of the following represents the SMALLEST quality of mass?
4ng ;
How many atoms of Oxygen (O) are in ONE molecule of H3OCIO4?
5
Which is NOT a volume measurement?
5.6 cubic milligrams
If a neutral element has the following chemical symbol, how many electrons are in carbon-13?
6
Which statement best describes an element?
A material consisting of only one type of atom
What does the following element description actually mean? 238 U 92
A uranium atom with 92 protons and 146 neutrons
Which atom is smallest?
Be
Which of the following elements are in the same group as silicon (Si)?
C (calcium)
What is the name of S2O3?
Disulfur Trioxide
Which of the following statements describe an isotope?
Element with the same number of protons but a different number of neutrons
Which element has the atomic number 9?
F (fluorine)
Which of the following pair of elements would have similar outermost electron configurations and therefore the most similar properties?
F, Cl
Elements that are in the same ______ have a tendency to have very similar chemical properties due to periodic trends?
Group
Which element is a non-metal
I
If you remove two protons and two neutrons from a gold atom (Au), what new element is formed (if any)?
Ir
Which of the following does NOT describe a neutron
It has a positive charge equivalent but opposite of an electrons
What is an atomic orbital?
It is a probability cloud that shows the probable location of an electron within a given atom
Which of the following provides the minimum amount of protection you need to block the following form of radiation? Gamma
Lead suit
Which neutral element does the following electron configuration correctly describe? 1sup/down 2sup/down 2pup/downx3 3sup/down
Mg
What is a diatomic element?
Molecule composed of two of the same type of atoms
Which neutral element does the following abbreviated electron configurations correctly describe? 1s^2 2s^2 2p^6
Ne
What is the element or ion that has 15 protons, 18 neutrons, and 18 electrons?
P-3
Which atom is is largest?
Rb
Which of these is not a metal?
Selenium (atomic # 34)
If you remove two protons and two electrons from a sulfur atom (S), what new element is formed?
Si
What is the name of the following compound NaF?
Sodium Fluoride
What is the name of the following compound SF3?
Sulfur Trifluoride
How are energy and frequency related?
The higher the frequency the higher the energy
How are the frequency and wavelength related?
The higher the frequency the lower the wavelength
Which of the following best describes a gas?
The molecules are moving quickly and are widely spaced
Which of the following can be classified as matter?
sand, water, perfume, and ice cream (all of the above)
Chemistry is the study of
matter and transformations of matter
What neutral element has the following abbreviated electron configuration? 1s2 2s2 2p6 3s2 3p5=17
Cl;
If you remove 2 neutrons and three electrons from a chromium atom the new element or ion that is formed is?
Cr+3
If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element?
15 N 7
If each of the following are energy level diagrams, which shows a correct arrangement for an atom with five electrons?
1Sup/down 2Sup/down 2Pup
Sort the following UNFILLED orbitals by energy, lowest to highest
1s,2p,3s,4s,3d,5s
What is the electron configuration of Mg?
1s2 2s2 3s2 2p6 which is the same as 1s2 2s2 2p6 3s2
Which of the following elements are in the same period as magnesium (Mg)?
Cl