Midterm review

Total number of significant digits
1000
Answer: 1
Total number of sig figs in 0.00230
Answer: 3
Solve and answer in correct sig figs:
3.90g + 14.1000g=
Answer: 18.00g
Which set is more precise?
a: 2.0,2.1, 2.2
b:2.000, 2.090,2.080
b:since it goes further past the decimal
Definition of accuracy?
Ability to hit the target
Definition of precision?
Ability to duplicate
State the correct unit for each:
mass, temp, length
kg (kilogram), K (Kelvin), m (meter)
Define control:
The group or population in the experiment which is used for comparison.
Identify the IV and DV.
If the concentration of sugar is higher then then more flies will be attracted.
IV: Concentration of sugar
DV: Number of flies
Define constant:
Anything else in an experiment that must be kept the same or it becomes an introduced variable
Number of protons, electrons, and nuetrons in a nuetral atom of carbon.
6,6,6
Use your periodic table to state the number of protons, electrons, and neutrons in Br.
p+= 35
e= 35
n=45
Use your periodic table to state the number of protons, electrons, and neutrons in Mn.
p+= 25
e= 25
n=30
Use your periodic table to state the number of protons, electrons, and neutrons in Cr-51
p+=24
e= 24
n= 27
Which element has 20 protons and 21 neutrons?
Ca-41
Which neutral element has 25 electrons and 29 neutrons?
Mn-54
Use your periodic table to state the number of protons, electrons, and neutrons in Mg +2
p=12
e= 10
n= 12
Use your periodic table to state the number of protons, electrons, and neutrons in I -1
p= 53
e= 54
n= 74
Name the type of element in Group I.
Alkali metals
Name the type of element in Group 14 with a p2 outer electron configuration.
Silicon
Which energy level is being filled in transition metals?
d
Write the electron configuration for P.
1s2 2s2 2p6 3s2 3p3.
Write the electron configuration for Gold.
[Xe] 6s1 4f14 5d10
Identify the element. [Xe] 6s2 4f14 5d4
Tungsten
Identify the element. [Kr] 5s2 4d2
Zirconium
Name the elements in Group 17.
Halogens
What type of charge to alkali earth metals tend to acquire?
+2
What type of charge does oxygen tend to acquire?
-2
Which noble gas configuration will the sulfur ion match?
Argon
Which noble gas configuration will the ion for sodium match?
Neon
Which form of electromagnetic radiation has greater energy, green or ultraviolet?
UV
Which form of electromagnetic radiation has greater speed, blue or radio?
Neither, they have the same speed.
Which form of electromagnetic radiation has higher wavelength, microwave or gamma ray?
Microwave
What causes elements to create colors when burned?
Electrons emitting a photon of light as it releases the energy when falling back down to a lower energy level.
How many valence electrons does potassium have?
1
How many valence electrons does chlorine have?
7
What is the outer electron configuration for alkali metals?
s2
Explain the role of positive and negative ions.
Cations (+) and anions (-) occur when elements give or take electrons in order to have more stable electron configurations. As charged particles they are more likely to bond and in ratios that represent their charges.
Name the geometry and bonding angles for SO3
trigonal planar, 120 degree
Name the geometry and bonding angle for water.
Bent, 109.5degree
Predict the type of bond between two fluorine atoms.
nonpolar covalent
Predict the bond type between Li and F
ionic
If Hydrogen en=2.1 and f en=4.0 the bond type is.
Polar covalent
Which type of bond shares electrons?
covalent
What is the pattern down a group for
electronegativities and atomic size.
lower, larger
What is the pattern going from left to right across a period for atomic size.
Tends to decrease.
Write the formula for dinitrogen pentaoxide.
P2O5
Which type of bonding uses prefixes to name the compounds?
Covalent
Write the formula for aluminum oxide.
Al2O3
Write the formula for copper II oxide.
CuO
x

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