Chemisty
A molecule is a
a neutral group of atoms held together by covalent bonds
A molecule is a:
a neutral group of atoms held together by covalent bonds
A chemical bond resulting from the electrostatic attraction between positive and negative ions is called a(n)
ionic bond
A chemical bond resulting from the electrostatic attraction between positive and negative ions is called a(n):
ionic bond
The electrostatic attraction between ____ forms an ionic bond.
ions
A 5 gram object that sinks in salt water will have a volume:
less than 5 mL
When chemical compounds form, valence electrons are those that may be:
lost, gained or shared
An example of an extensive property of matter is:
mass, volume, temperature
An example of an intensive property of matter is
melting point, density
A group of many atoms held together by covalent bonds and has a charge is known as a
molecular formula
An ionic compound is usually formed between a metal and a:
nonmetal
Elements to the upper right side of the "staircase/zig-zag" have properties most associated with
nonmetals
Ions
positively and negatively charged atoms
The wave with the lowest frequency on the EM spectrum is:
radio
Because a few positively charged particles bounced back from the foil, Rutherford concluded that such particles were:
repelled by densely packed regions of positive charge.
A family or a group of elements is expected to have:
similar chemical and physical properties
A chemical bond results from the transfer or sharing of:
valence electrons
periodic table groups
vertical columns
The independent variable would be:
volume
As the atomic number of the metals of Group 1 increases, the ionic radius
increases
In the modern periodic table, elements are ordered according by
increasing atomic number
A scientist finds an atom of chlorine that has gained an extra electron. What is the charge of that atom?
-1
Convert 55 mm to Km. What would be the answer's exponent if written in scientific notation?
-5
Convert 12 nanometers (nm) to decimeters (dm). What is the answer's exponent?
-7
23 grams of sodium is reacted with chlorine to produce sodium chloride (table salt). If 58 grams of sodium chloride was produced, how many grams of chlorine must have reacted?
35 g
In the NaCl crystal, each Na + and Cl - ion has clustered around it ____ of the oppositely charged ions.
4
Alpha
4/2 He
In scientific notation, 0.00005 would be:
5 x 10^-5
What is the ionic charge of elements in the alkali family?.
+1
A scientist finds an atom of carbon that has lost 4 electrons. What is carbon's charge?
+4
Beta
0/-1 e
According to the graph, the density of water would be:
1 g/mL
A graduated cylinder is initially filled with water to the 15 mL mark. An irregularly shaped object is placed in the graduated cylinder. The water rises to the 27 mL mark. The volume of the object is:
12 mL
An isotope of Sodium has a mass of 24. How many neutrons are in this isotope?
13
The mass of an object with a volume of 10 mL and a density of 2g/mL would be:
20g
Divide 1.05 x 10-6 by 2.77 x 10-5
3.79 x 10^-2
Convert 30,000 Kilometers (Km) to Megameters (Mm)
30
The number of valence electrons in Group 17 or 7A Halogen elements is
7
The number of valence electrons in Group 7A or 17 Halogen elements is:
7
What family has the lowest electronegativity and lowest ionization energy?
Alkali Metals
periodic table families
Alkali metals, Alkali Earth metals, Boron family, Carbon family, Nitrogen family, Oxygen family, Halogen family, and Nobel gases family. The bottom row has the Lanthanide series and the Actinide series.
Isotopes
Atoms of the same element that have different numbers of neutrons
Halogens
Contains nonmetals, 7 valence electrons in it's outermost energy level. Very reactive
valence electrons
Electrons on the outermost energy level of an atom
True/False: An object with a mass of 100 grams and a volume with 22 mL would FLOAT in water
False
What element has an ending electron configuration of 3d6?
Fe
What describes the splitting of an atom's nucleus to release energy?
Fission
What process occurs in the sun in which hydrogen atoms combine to form sunlight?
Fusion
alkali metals
Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
The elements that border the zigzag line in the periodic table are
Metalloids
Na-24 produces what isotope after undergoing beta decay?
Mg-24
What is the formula for Magnesium Chloride?
MgCl2
What would be the formula for Magnesium Chloride?
MgCl2
What would be the name for NaNO3?
Sodium Nitrate
What family has the highest overall ionization energy but virtually zero electronegativity?
Noble Gases
Polonium 215 would produce what isotope after undergoing alpha decay? (you should work this out on paper, instead of staring blankly at the screen!)
Pb- 211
What form of Uranium is fissile and is capable of undergoing a chain reaction?
U-235
Gallium would have a noble gas electron configuration of
[Ar]-4s2-3d10-4p1
Gallium would have a noble gas electron configuration of:
[Ar]4s 2 3d 10 4p 1
Which of the following are Intensive Properties of Matter?
boiling point, density, color
The nucleus of an atom has all of the following characteristics EXCEPT that it:
contains nearly all of the atom's volume.
As you move left to right from gallium through bromine, the atomic radii will:
decrease
A graph which plots mass (y) vs. volume (x) would have a slope that represents:
density
A chemical bond results from the mutual attraction of the nuclei of atoms and
electrons
The light from a hot/excited gas would be expected to produce which of the following spectra?
emission spectrum
For an electron in an atom to change from the ground state to an excited state, what must happen?
energy must be absorbed.
metals and nonmetals
form ionic bonds
As you move left to right from gallium through bromine, atomic radii
generally decreases
The three primary colors of light are red, blue and:
green
gamma rays
high-energy electromagnetic waves emitted from a nucleus as it changes from an excited state to a ground energy state
independent variable
x-axis
dependent variable
y-axis