Question

(I have a chemistry study guide that confuses me, anything will help!!!)

2) Pure Chemistry is defined as

4) An example of physical properties of a substance is

8) The maximum number of d orbitals in a principal energy level are

9) Elements that are characterized by the filling of p orbitals are classified as

11) Cations are formed by

12) Compared with the electronegativities of the elements on the left side of a period, the electronegativities of the elements on the right side of the same period tend to be ____(lower/higher)

19) The empirical formula of a substance that is 53.5% C, 15.5% H, and 31.1% N by weight is

20) The percent composition of chromium in BaCrO4

1) The element chromium has four naturally occurring isotopes. Use the relative abundance of each to calculate the average atomic mass of chromium.
Cr=4.34%, Cr=83.79%, Cr=9.50% and Cr=2.37%

2) Write down the electron configuration for the chloride ion and sulfide ion

3) Calculate the percent by mass of hydrogen in aspirin, C9H8O4

4) Describe the shapes and relative energies of the s, p, d, and f atomic orbitals

5) Explain how atoms (ions) are held together in an ionic bond. Give an example of an ionic compound

6) A 500-g sample of Al2 (SO4)3 is reacted with 450 g of Ca (OH)2. A total of 596 g of CaSO4 is produced. What is the limiting reagent in this reaction, and how many moles of excess reagent are unreacted? ( Full credit will be given for this question as this topic was skipped)

7) Predict the precipitate that forms when aqueous solutions of silver nitrate and potassium chloride react to form products in a double-replacement reaction. Include a discussion of how to write the complete chemical equation describing this reaction.

8) Compare and contrast Dalton’s atomic theory with JJ Thompson’s Plum pudding model.

9) How many liters of O2 are needed to react completely with 45.0 L of H2S at STP?

10) The diameter of a carbon atom is 0.000000000154 m. What is this number expressed in scientific notation?

11) Explain what is meant by VSEPR theory. Give an example of how VSEPR theory can be applied to predict the shape of a molecule.

12) What is the quantum mechanical model?

Answer 1

4) Example of physical properties: colour, Smell, texture, boiling and melting point density and viscosity.

11) Cations are formed when positively-charged ions and anions negatively-charged ions are formed when a metal loses electrons, and a nonmetal gains those electrons. The electrostatic attraction between the positives and negatives brings the particles together and creates an ionic compound, such as sodium chloride.

12) Quantum mechanical model: The Quantum Mechanical Model. ... The quantum mechanical model of the atom uses complex shapes of orbitals (sometimes called electron clouds), volumes of space in which there is likely to be an electron.

Hope these helped!