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 ...
Please see attachment
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
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
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...
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...
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...
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...
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...
Unit 3 Methods: Solutions
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...
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) (...
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...
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 (...
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:
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)
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...
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
Step 3 = Add 10mL 6M Sodium Hydroxide
Observed that the mass increased to 131.273g
Mass of empty test tube = 27.400g
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.
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: ______________________.
Organic Chemistry Part IV
1- Draw a structure for each alkane.
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...
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...
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...
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...
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...