Writing aim and conclusions in a report

Aim 1. To determine the mole ratio of barium chloride to water in a hydrated barium chloride that BaCl2: H2O. Measure the mass before heating. Use heat For hydrate, and To find the mass of water measured after heating, and subtract the two masses to get mass of water. To convert mass ...

Atomic theory of matter

Please see attachment Question 27 The atomic and mass numbers for four different atoms are given below. Which two are isotopes of the same element? Atom Atomic Number Mass Number A 100 257 B 101 257 C 101 260 D 102 259 A and B B and C B and D C and D Question 30 Descr...

Energy Shell

For the following atoms in their ground state, determine the number of electrons in each energy shell. If there are no electrons in the particular energy shell, leave that answer box blank. (Please see attached file

Analysis of Atomic Radius variation with Z and period

03.03 Periodic Trends: Assignment Details For this assignment, you will be creating two graphs to show the trends of atomic radius across the periods and down a group on the periodic table. Then you will use your graph and what you have learned in the lesson to answer questions. Part I: Atomic Rad...

Properties of your chosen element

you are going to investigate an element of your choice. Once you have chosen and researched your element, you will create a presentation using powerpoint or Word document . Your presentation should include the following information: • the element's name and the origin of its name • the element...

Covalent and Ionic Bonding

Research the answers to the following questions on the internet and write your answers in your own words. For each answer, include the address of the web site (or title and author of a book or article) that you used to help you answer the question. 1. Which type of compound usually has higher mel...

Decomposition and Synthesis Reactions

Question 1 (Essay) Write the complete balanced equation for the reaction between barium metal (Ba) and nitrogen gas (N2). You do not need to make the subscripts smaller; just write them out as regular numbers. For example: N2. Question 2 (Multiple Choice) Which of the following is a p...

Plant Growth Experiment

Katherine wants to investigate if the time of day a plant is watered affects the growth of the plant. She hypothesizes that a plant watered in the morning will grow faster than a plant watered at other times of the day. Identify the specific independent and dependent variables that will be invol...

Graphing: Solubility

Unit 3 Methods: Solutions Graphing: Solubility Question Answer What do the numbers on the y-axis represent? What does each curve on the graph represent? Which substances show increasing solubility with increasing temperature? Which substances show decreasing solubility with increasin...

Voltaic Cell EMF: numerical problems

1. Using data in Appendix E, calculate the standard emf for each of the following reactions: (a) H2(g) + F2(g) → 2 H+(aq) + 2 F-(aq) (b) Cu2+(aq) + Ca(s) → Cu(s) + Ca2+(aq) (c) 3 Fe2+(aq) → Fe(s) + 2 Fe3+(aq) (d) 2 ClO3-(aq) + 10 Br-(aq) + 12 H+(aq) → Cl2(g) + 5 Br2(l) + 6 H2O(l) 2. U...

Redox Reactions and Voltaic Cell

Complete and balance the following equations, and identify the oxidizing and reducing agents. (Recall that the O atoms in hydrogen peroxide, H2O2, have an atypical oxidation state.) (a) NO2-(aq) + Cr2O72-(aq) → Cr3+ (aq) + NO3-(aq) (acidic solution) (b) S(s) + HNO3(aq) → H2SO3(aq) + N2O(g) (...

Electrode Potential

Measurements on the open-circuit cell as the figure shown below (see attached) indicate that when the partial pressure of H2 is 0.9 atm and that of HCl is 0.01 atm, the electromotive force is E = 0.011V at T=298.15K. Calculate the standard potential, E. Note: Faraday constant (F) = 96.485*10^3 C...

Acid-Base Reactions, Buffer and Thermodynamics

I am stuck on a few chemistry questions. Please help. 17.16) Use information from Appendix D to calculate the pH of (a) a solution that is 0.250 M in sodium formate (HCOONa) and 0.100 M in formic acid (HCOOH); (b) a solution that is 0.510 M in pyridine (C5H5N) and 0.450 M in pyridinium chloride (...

Le Chateliers Principle Lab

Observations: 1 1mL Ba(NO3)2 + 0.5mL K2CrO4 + drops HCl? + drops NaOH? "Ba(NO3)2=clear and colourless Ba(NO3)2 + K2CrO4= yellow turbid solution (precipitate) HCl= clear yellow solution (precipitate dissolved) NaOH= yellowish turbid solution (precipitate returns by neutralizing acid) " 2 1mL B...

Kinematics: Rate Law and Rate Constant

Consider the reaction of peroxydisulfate ion S2O8 ^2 - with iodide ion (I-) in aqueous solution: S2O8^2-(aq) + 3I-(aq)  2SO4 ^2-(aq) + I3-(aq) At a particular temperature the initial rate of disappearance of S2O8^2- varies with reactant concentrations in the following manner: Experiment [S2O8...

Molar Mass of Iron(III) Oxide

What is the molar mass of iron(III) oxide? Include a step-by-step procedure for calculating molar mass, accompanied by an explanation.

The Enthalpy Change of a Chemical Reaction

The following are the givens from the experiment: Experiment 1: Measuring the Calorimeter Constant Temperature of the Calorimeter = 21.5C Temperature of Calorimeter after adding the water from the flask from bath= 39.2C Experiment 2: Enthalpy Change of a Chemical Reaction (3 Trials) Trial ...

Molar Volume of an Ideal Gas Lab

Part 1 The following are the givens from the experiment: Initial Experiment with 10mL- 6 M HCl and 0.25g Zinc Initial Teperature = 21.5C Initial Pressure = 1.00atm After adding 0.25g Zinc - The solution reacted Pressue = 1.69atm Temperature = 27.3C Volume in Syrenge = 92.2mL Volume in Flask...

Lab: Empirical Formula of Copper Oxide

Step 1 = 5g of copper sulfate pentahydrate added to 50mL beaker Mass of beaker & contents = 90.000g Step 2 = add 30mL water to copper sulfate pentahydrate mass= 120.000g Step 3 = Add 10mL 6M Sodium Hydroxide Observed that the mass increased to 131.273g Mass of empty test tube = 27.400g Mass...

Solubility Ranking

Rank the following molecules in order from most soluble in water to least soluble in water: methane, hexanol, propane?

Why Equilibrium is Favored in One Direction

Show mathematically by using equilibrium constants that the reaction between OH- and the weak acid goes only to the right. This question is illustrated more clearly and in detail in the attachment. Please look at the attachment for the complete formulation of the question.

Net Ionic Equation for NaOH + Hcl

Please assist with writing the balanced formula equation and the net ionic equation for the reaction of sodium hydroxide with hydrocholoric acid. formula equation: ______________________ net ionic equation: ______________________.

Drawing structures for alkanes

Organic Chemistry Part IV 1- Draw a structure for each alkane. A- 2,2-dimethylpentane B- 3-isopropylheptane 2- What is the name of the following organic compound? CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 Spell out the name of the compound. 3- What is the name of the following organic compoun...

Molecular formulas for alkanes

Organic Chemistry Part III 1- Consider the alkane shown in the model. A- What is the molecular formula for the alkane shown in the model? Express your answer as a chemical formula. B- Name the alkane shown in the model. Express your answer as the IUPAC name. C- Draw the structure of the cycl...

Five Radioactivity and Nuclear Chemistry Questions

1- An injection containing 10.0pg 10 5 B was injected into a patient suffering from a brain tumor. The patient was irradiated by a neutron gun at the site of the tumor. Calculate the amount of energy released in megaelectronvolts given that 931 MeV is released for each 1 amu mass defect. To calculat...

Radioactivity and Nuclear Chemistry Discussion

1- BNCT relies on the initial targeting of tumor cells by an appropriate chemical compound tagged with 10 5 B , which preferentially concentrates in tumor cells. During the irradiation of the tumor site by neutrons ( 1 0 n ) the 10 5 B absorbs a low-energy neutron ( 1 0 n ), and it ejects an en...

Problems About Radioactivity and Nuclear Chemistry

1. At 8:00 a.m., a patient receives a 58-mg dose of I -131 to obtain an image of her thyroid. If the nuclide has a half-life of 8 days, what mass of the nuclide remains in the patient at 5:00 p.m. the next day? (Assume no excretion of the nuclide from the body). Express your answer using two signif...