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Identifying Element from Number of Protons and Neutrons.An unknown element which has 120 protons and 174 neutrons
What will be the likely charges of elements with an electron arrangement of 2,8,8,2 and an element with an electron arrangement of 2,8,18,7 when they form ions?
Which of the elements are likely to be metals?Which elements are gases at STP?
Describe how to find the oxidation states of various elements.Describe the octet rule and the difference between metals and non-metals,
How Many Elements Occur Naturally?This posting gives a clear answer to a common question for High School students:
Pressure and Dalton's Atomic Theory.Hydrogen gas is contained in a one-liter vessel at "STP"(0 degrees Celsius and 1 Std. Atm.).
In such a reaction what does the word stoichiometry mean?Describe the chemical structures of:- Ammonium hydroxide
Write the formula for the compounds. Side note: What is the best way to learn how to name these things?
Draw the lewis structure and indicate the direction of the bond dipole for C-F and Si-S.Which of the following species is smaller: I or I-? why?
Predict how valence electrons would pair up in the AsO4-3 ion.Predict the bond angles in SbCl3 and BH3.
Atomic Theory and Bonding Problem Set.Draw the lewis structure and indicate the direction of the bond dipole for C-F and Si-S.
What happens when a puddle evaporates?What happens when you get a cut or scrape?
What fundamental law does this experiment demonstrate?How is this law explained by Dalton's atomic theory?
What is the symbol for the element that has 28 protons?How many neutrons are in an element of 243Pu?
What is the average atomic mass of zinc according to the following data? Use four decimal places in your answer, do not include units.
When two atoms join together, they form a(n) a. Isomer b. Isotope c. Covalent bond d. Molecule
Reactions and Fractures.In addition, what does reaction B tell you about the type of molecule H2CO3 is?
Determine if the functions below are odd, even or neither.
What is the value of ?H° (in kJ) for the reaction described below? Assume the reaction is performed at 25°C.
Calculate deltaS standard for the sublimation of CO2. The enthalpy of sublimation is delta H^0=25.23 kJ/mol at 195K.
In a free radical reaction, the following step would be categorized as: CH3 + Br ----------> CH3Br
A 10.0-liter vessel contains 5.0 atm of CO and 3.0 atm of NO2 at 25°C. How much heat (in Joules) will be liberated if this is allowed to react to completion.
You are given 10.0 grams of a mixture of NaNO3 and KF. You dissolve this mixture in 100.0 grams of water, and the temperature rises by 1.02°C.
A system that cannot exchange either matter or energy with its surroundings is called an _______________ system.
Which one of the following processes results in a decrease of the entropy of the system?