-
Which of the following is an example of a conversion from electrical energy to sound energy? microphone radio generator windmill
$35.00
Chemistry
Waiting for answer
-
All of the following are indicators of chemical change except… a. Change in color b. Production of a gas c. Formation of a precipitate d. All of the above are indicators of chemical change
$12.00
Chemistry
Waiting for answer
-
Pb(NO3)2 (aq) + 2KI (aq) ——> PbI2 (s) + 2KNO3 (aq) what type of reaction the following chemical equations represent.
$12.00
Chemistry
Waiting for answer
-
For the reaction 2HNO₃ + Mg(OH)₂ ---> Mg(NO₃)₂+2H₂O how many moles of magnesium nitrate are produced from 143.2 grams nitric acid, HNO₃?
$15.00
Chemistry
Waiting for answer
-
Use kinetic-molecular theory to describe what happens when an ice cube or icicle melts. Include how energy is involved and what happens to the motion of the water molecules
$15.00
Chemistry
Waiting for answer
-
Complete this equation for the dissociation of na2co3(aq). omit water from the equation because it is understood to be present.
$10.00
Chemistry
Waiting for answer
-
A sealed vessel initially contains only CO2 and CaCO3 if the temperature remains at 215K and the volume remains at 1.6L while the reactions occurs will the pressure increase decrease or remain the sam
$10.00
Chemistry
Waiting for answer
-
What weight of NaOH is needed to prepare 5.00x10^2 ml of a 0.100 M solution? The formula weight of NaOH is 39.997 g/mol.
$20.00
Chemistry
Waiting for answer
-
Scientists measure the time between the arrival of an earthquake's _______ and _______ waves to help determine the distance between the recording seismograph and the earthquake epicenter.
$10.00
Chemistry
Waiting for answer
-
If a pure r isomer has a specific rotation of –147.0°, and a sample contains 61.0% of the r isomer and 39.0% of its enantiomer, what is the observed specific rotation of the mixture?
$12.00
Chemistry
Waiting for answer
-
What is the half-life of a first-order reaction if it takes 4.8 ´ 10-3 seconds for the concentration to decrease from 1.33 m to 0.51 m?
$20.00
Chemistry
Waiting for answer
-
Winds are generated by pressure differences in the atmosphere. Which factor is directly responsible for these pressure differences in the atmosphere? A) The day–night cycle on Earth B) Uneven landfo
$15.00
Chemistry
Waiting for answer
-
In the following reaction, 451.4 g of lead reacts with excess oxygen forming 312.5 g of lead(II) oxide. Calculate the percent yield of the reaction.
$35.00
Chemistry
Waiting for answer
-
what acids are in caffeine, nicotine, p-amino benzoic acid, aspirin, linoleic acid, vitamin c, ibuprofen, acetaminophen, histamine, safrole, glucose fructoe, sucrose, cortisone, cysteine
$10.00
Chemistry
Waiting for answer
-
1. What is the cause of the Coriolis effect? A: Changes in wind direction B: Earth's Rotation C: Relative Humidity D: Koppen Zone 2.Which Term is given to the amount of water that is in any specific a
$15.00
Chemistry
Waiting for answer
-
According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?
$35.00
Chemistry
Waiting for answer
-
A mass of 0.630 g of nacl is dissolved in 525 g of water. part a calculate the molality of the salt solution.
$20.00
Chemistry
Waiting for answer
-
A sample in a 1 cm cuvette gives an absorbance reading of .558. if the absorptivity for this sample is 15000L/(mol.cm), what is the molar concentration?
$35.00
Chemistry
Waiting for answer
-
If you had only 25 g of KOH remaining in a bottle, how many milliliters of 7.0 %(w/v) solution could you prepare?
$10.00
Chemistry
Waiting for answer
-
A chemist who studies water samples did a demonstration of how to test for lead in water. She added a clear solution of potassium iodide to a clear solution of lead nitrate. Then a yellow swirling sol
$15.00
Chemistry
Waiting for answer
-
Describe the sequence of adding ingredients to make the recipe for condensed tomato soup. To mix the ingredients, you have an industrial-sized vat with a capacity of 800 L. You also have the ability t
$12.00
Chemistry
Waiting for answer
-
I need a lab repot. Please check these attatch files first.
$10.00
Chemistry
Answered
-
Read this article and fill up the sheet.
$10.00
Chemistry
Answered
-
I need help with question 3, 4, 5, 6,9
$10.00
Chemistry
Waiting for answer
-
What are some patterns we can use in order to predict reactivity in elements based on the periodic table?
$10.00
Chemistry
Waiting for answer
-
When will the following thermodynamic terms of formation be equal to zero? Delta H f S f Delta G f
$10.00
Chemistry
Waiting for answer
-
hydrolysis reaction that produces Propanol
$10.00
Chemistry
Waiting for answer
-
Please read those three pages of article and Write summary and finish some questions.
$10.00
Chemistry
Answered
-
Reaction of 1-butanol with NaNh2
$10.00
Chemistry
Waiting for answer
-
qestion of P-block
$10.00
Chemistry
Waiting for answer
-
Chemistry
$10.00
Chemistry
Waiting for answer
-
CHEM LAB ESSAY
$20.00
Chemistry
Answered
-
drawing shape (with net dipole) and dipole moment
$10.00
Chemistry
Waiting for answer
-
Chem assignment
$10.00
Chemistry
Answered
-
how do i convert 4.95×1022 zinc atoms to grams
$10.00
Chemistry
Waiting for answer
-
CHEM ( ACID AND BASE)
$25.00
Chemistry
Answered
-
help
$10.00
Chemistry
Waiting for answer
-
How do you compare intermolecular forces?
$10.00
Chemistry
Waiting for answer
-
Science questions
$12.00
Chemistry
Waiting for answer
-
Dimensional analysis
$10.00
Chemistry
Waiting for answer
-
CHEM
$10.00
Chemistry
Answered
-
Average atomic mass, help please.
$10.00
Chemistry
Waiting for answer
-
phase diagrams
$10.00
Chemistry
Waiting for answer
-
Freundlich adsorption isotherm: Physical Chemistry
$10.00
Chemistry
Answered
-
Reading Assignment (CHEM)
$10.00
Chemistry
Answered
-
Passing ch3br in agcn
$10.00
Chemistry
Answered
-
chemistry
$10.00
Chemistry
Waiting for answer
-
calculating mole ratio
$10.00
Chemistry
Waiting for answer
-
biochemistry Literature
$10.00
Chemistry
Waiting for answer
-
You have gas! Well, you have a 450.0 mL sample of gas in a flexible container at 298.15 K. If you heat the gas to a temperature of 315.15 K, what is the new volume in liters (L)?
$10.00
Chemistry
Waiting for answer