Periodic Table Trends
What is the trend of increasing atomic radius on the periodic table?
Atomic radius increases from right to left, and from top to bottom
What are the properties of solids?
fixed volume and shape, molecules are slow moving and tightly packed together
What group does Be belong to?
Alkaline earth metals (Group 2)
The temperature of a chemical reaction in a laboratory is recorded as 25.0°C. Convert this temperature to Kelvin.
298.15 K
What is 140 in scientific notation?
1.4 x 102
Does Rubidium or Caesium have a larger atomic radius?
Caesium
Oil and water is an example of?
Heterogeneous mixture
Describe what properties Kr would have.
Non-metal: brittle, poor conductors, dull, low melting point
A weather report states that the temperature outside is 95.0°F. Convert this temperature to Celsius.
35.0°C
What is 0.578 in scientific notation?
5.78 x 10-1
Does Cl or F have a higher ionization energy?
Flourine
Cooking an egg is an example of what kind of change?
Chemical change
What element does 1s22s22p63s23p64s23d104p3 represent?
Arsenic
A sample of an element contains two isotopes: Isotope A has a mass of 10.012 amu and makes up 20% of the sample, while Isotope B has a mass of 11.009 amu and makes up 80% of the sample.
Calculate the average atomic mass of the element in this sample.
10.81 amu
What is 7,890,000 in scientific notation?
7.89 x 106
Arrange the following elements in order of decreasing atomic radius: Potassium (K), Sulfur (S), Neon (Ne), and Calcium (Ca).
Potassium (K) > Calcium (Ca) > Sulfur (S) > Neon (Ne)
True or false: The chemical composition of a cake is the same before and after baking in the oven
False
How many protons, neutrons and electrons would Ne-21 have?
Protons: 10
Neutrons: 11
Electrons: 10
A newly discovered element, X, has two naturally occurring isotopes:
Isotope X-108 has a mass of 108.2 amu and an abundance of 65.4%.
Isotope X-110 has a mass of 110.3 amu and an abundance of 34.6%.
Calculate the average atomic mass of element X.
108.89 amu
What is 0.00003012 in scientific notation?
3.012 x 10-5
Arrange the following elements in order of increasing first ionization energy: Sodium (Na), Phosphorus (P), Oxygen (O), and Aluminum (Al).
Sodium (Na) < Aluminum (Al) < Phosphorus (P) < Oxygen (O)
Describe the difference between pure substances and mixtures. Give an example of each.
Pure substances have a chemically fixed composition (ex: elements or compounds)
Mixture are when two or more substances are physically mixed but not chemically combined (ex: heterogenous or homogeneous)
What is the noble gas electron configuration of Selenium? Draw the orbital diagram as well.
[Ar] 4s2 3d¹⁰4p4
Stainless steel is an alloy with the following composition:
Iron (Fe) 72.0%, Chromium (Cr) 18.0%, Nickel (Ni) 10.0%
If you have a 4.00 g sample of stainless steel, what is the mass of iron (Fe) in the sample?
2.88 g of iron
What is 45,000,000,000 in scientific notation?
4.5 x 105