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)
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 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 200 g sample of water is heated, and its temperature rises from 25.0 °C to 45.0 °C. The specific heat capacity of water is 4.18 J/g·°C. How much heat energy is absorbed by the water?
16,720 J
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 chemist has 50.0 g of water at its boiling point (100°C). The heat of vaporization of water is 40.79 kJ/mol. How much heat is required to completely vaporize this sample of water?
113.3 kJ
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), Nitrogen (N), and Calcium (Ca).
Potassium (K) > Calcium (Ca) > Sulfur (S) > Nitrogen (N)
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
Imagine you’re conducting an experiment in a high school chemistry lab. You have a 100.0 g sample of water at an initial temperature of 25.0 °C. You decide to heat the water using a portable heater that delivers a total of 500.0 J of energy. After heating, you plan to use this water to brew tea, and you want to ensure it's at the perfect temperature for steeping your favorite blend.
Calculate the final temperature of the water after adding the heat. (The specific heat of water is 4.18 J/g∙°C.)
26.2 °C
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.
Pure substances have a chemically fixed composition
Mixture are when two or more substances are physically mixed but not chemically combined
What is the electron configuration of copper?
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰
A researcher has 2.0 g of each of the following substances: Copper (specific heat = 0.385 J/g∙°C), Ethanol (specific heat = 2.44 J/g∙°C), Aluminum (specific heat = 0.897 J/g∙°C), Iron (specific heat = 0.450 J/g∙°C), and Ice (specific heat = 2.09 J/g∙°C).
What is 45,000,000,000 in scientific notation?
4.5 x 105