Chemistry Unit 1
How is the measurement 0.000065 cm written in scientific notation?
6.5 x 10^-5cm
Periodic table families
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A numerical result is said to have same precision if
it has a small number of significant figures
Elements in a group of column in the periodic table can be expected to have similar
properties
What is the mass number of deuterium?
2
The elements in group 1 are also known as the
alkali metals
The measurement 0.020 L is the same as
2.0 x 10^-2L
# of significant figures in measurement 2010 cm is
3
The average distance between the Earth and the moon is 386.000 km. Expressed in scientific notation, this distance is written as
3.86 x 10^5
Example of four significant figures
30.00
If the mass number of nitrogen is 15 and its atomic number is 7 how many neutrons does this atom of nitrogen have?
8
Calcium and Beryllium belong to
Alkali Earth Metals
Potassium and sodium belong to
Alkali metals
Is Nitrate a cation or anion?
Anion
Consider electronegativity, the ability of a nucleaus to hold on to or attract an electron. Looking at a period, where is the electronegativity highest?
At the right
Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing...
Atomic Mass
What is true according to modern atomic theory?
Atoms of the same element may have different masses.
Which of the following is not a physical change?
Burning
Which of the following is an intensive property of matter?
Desnity
Which of the following example of heterogeneous mixture?
Granite and seawater
What does NaCl (aq) look like?
It looks like water
The formula and charge of the Nitrate Polyatomic ion is
NO3^-1
What is the formula for the hydroxide polyatomic ion?
OH
Which of the following is an example of a homogenous mixture?
Orange Juice
Rutherford's experiments led him to conclude that atoms contain massive central regions that have
Positive charge
What is the formula for sulfate polyatomic ion?
SO4
Which of these is a measure of the amount of material?
True: Mass False: Density, weight, volume
A measurement that closely agrees with an accepted value is best described as
accurate
Which of the following is an extensive property of matter?
Volume
It is easy to determine whether a substance is a metal if the substance is
a good electrical and heat conductor
A horizontal row of blocks in the periodic table is called
a period
A homogenous mixture is also called
a solution
The graph of two variables that are directly proportional to one another is
a straight line
A metal solution is an
alloy
All atoms of the same element have the same
atomic number
The density of an object is calculated by
dividing its mass by its volume
Experiments with cathode rays led discovery of the
electron
A physical change occurs when a
glue gun melts a glue stick.
Across a period in the periodic table, atomic radii
gradually decrease
The vertical columns on the periodic table are called
groups
The liquid state of matter can be described as
having a definite volume but not a definite shape
The most characteristics property of the noble gases is that they are
largely unreactive
Compared to the alkali metals, the alkaline earth metals are
less reactive
Matter includes all of the following except
light
A state of matter in which a material has no definite shape but has a definite volume is the_______
liquid state
Isotopes are atoms of the same element that have different
masses
The average atomic mass of an element is the average of the atomic masses of its
naturally occurring isotopes
A nuclear particles that has about the same mass as a protons, but with no electrical charge is called a
neutron
Argon, krypton, xenon are
noble gases
According to Dalton's atomic theory, atoms
of each elements are identical in size, mass, and other properties
The most common form of hydrogen has
one neutron
In Rutherford's experiments most of the particles
passed through foil
The atomic number of oxygen, 8, indicates that there are eight
protons in the nucleus of an oxygen atom.
Metalloids are often
semiconductors
The two most important properties of all matter are
taking up space and having mass
Mendeleev predicted that the spaces in his periodic table represented
undiscovered elements
What is the solvent in NaF (aq)
water