Posted in Chemistry

Please login to view the answer

Login
Join us

Related Questions

Posted in Chemistry

For a scientific theory to be valid, it must allow?

Please login to view the answer

Login
Join us

Posted in Chemistry

The pressure inside an an automobile tire is 44.0 pounds per square inch on a warm summer day (44.0 degree Celcius). Calculate the tire pressure in the same tire on a very cold day (-35.0 degree celcius) assuming that no air escapes from the tire

Please login to view the answer

Login
Join us

Posted in Chemistry

Is it possible for three or more elements to form a solid solution? Explain your answer.

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

Is it possible for three or more elements to form a solid solution? Explain your answer.

Please login to view the answer

Login
Join us

Posted in Chemistry

Which of the following pairs of reactants is not correctly listed with its product solution? A. Strong acid-strong base reactants—more acidic solutions B. Weak base-strong acid reactants— more acidic solutions C. Strong base-strong acid reactants—neutral solutions D. Weak acid-strong base reactants— more basic solutions

Please login to view the answer

Login
Join us

Posted in Chemistry

If 12.6 grams of iron (III) oxide react with 9.65 grams of carbon monoxide to produce 7.23 g of pure iron, what are the theoretical yield and percent yield of this reaction? Be sure to show the work that you did to solve this problem. unbalanced equation: Fe2O3 + CO yields Fe + CO2

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

According to the periodic table, which statement correctly describes the change from a neutral atom of an element to its ion?

Please login to view the answer

Login
Join us

Posted in Chemistry

A piece of unknown metal with mass 68.6 g is heated to an initial temperture of 100°C and dropped in 84 g of water (with an initial temperture of 22°C) in a calorimeter. The final temperture of the system is 52.1°C. The specific heat of water is 4.184 J/g*°C. What is the specific heat of the metal? A. 0.171 B. 0.343 C. 1.717 D. 3.433

Please login to view the answer

Login
Join us

Posted in Chemistry

How much greater is the pressure at the deepest part of the ocean compared to that found at sea level? 10 times 100 times 1,000 times 1,000,000 times

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

Most scientific questions are developed from

Please login to view the answer

Login
Join us

Posted in Chemistry

10pts Body Systems Interactions WebQuest Choose 7 out of the following 10 situations and use the Internet to research and write an answer to the two questions. Remember to write the answers in your own words and to cite the sources of your information. Copying materials will result in a zero for the assignment. What two (or more) systems are involved in this process? How are they involved? Situations Playing a video game Getting energy to sit through class by eating cereal and a banana Going through puberty Touching a hot pan and yanking your hand away Jumping up and down Drinking water on a hot day Sneezing Blushing Hitting your head on the top of the car as you get into it Breathing harder during a jog For Example: Delivery of oxygen to the blood Answer: The respiratory system draws in oxygen-filled air from the environment through the nose and trachea to the lungs. In the tissues of the lungs, blood vessels cover the tiny air sacs called alveoli. Here, the oxygen is exchanged with the carbon dioxide being dumped by the blood. As part of the circulatory system, the heart pumps the blood to the lungs, and then to the rest of the body through arteries and veins, to deliver the oxygen to all the cells and pick up the carbon dioxide.

Please login to view the answer

Login
Join us

Posted in Chemistry

Calculate the speed of sound wave with a frequency of 20hz and a wave length of 3.00m

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

A little kitten jumps from a tree and hits the ground 2.6 seconds later.with this information calculate the cat’s velocity right before it hits the ground

Please login to view the answer

Login
Join us

Posted in Chemistry

This answer is incorrect.

Please login to view the answer

Login
Join us

Posted in Chemistry

A fictitious element X is composed of 10.0 percent of the isotope 55X, 20.0 percent of the isotope 56X, and 70.0 percent of the isotope 57X. Calculate the weighted atomic mass of element X to the nearest tenth.

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

How do I calculate the standard enthalpy change for the following reaction at 25 °C ? MgCl2(s)+H2O(l) –> MgO(s)+2HCl(g)

Please login to view the answer

Login
Join us

Posted in Chemistry

Calculate the number of calories present in a chocolate chip cookie that contains 16 g carbohydrate, 3 g protein, and 7 g fat. Express your answer to one significant figure and include the appropriate units.

Please login to view the answer

Login
Join us

Posted in Chemistry

Suppose 1.1854g of copper(II) sulfate pentahydrate is heated to drive off the water of crystallization. Calculate what mass of water would be expected to be released from the salt.

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

An irregularly shaped solid which has a mass of 10.283g was placed in a graduated cylinder containing an inert liquid. The initial volume of liquid was read as 6.26mL. The solid was completely submerged in the liquid and the total volume of the liquid plus solid was read as 8.89mL. Calculate the density of the solid.

Please login to view the answer

Login
Join us

Posted in Chemistry

Consider the generic reaction between reactants A and B: 3A+4B→2C If a reaction vessel initially contains 9 mol A and 4 mol B, how many moles of A will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.) How many moles of B will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.) How many moles of C will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.) Express your answer using two significant figures.

Please login to view the answer

Login
Join us

Posted in Chemistry

Three compounds containing potassium and oxygen are compared. Analysis shows that for each 1.00 g of O, the compounds have 1.22 g, 2.44g, and 4.89 g of potassium respectively. Show how these data support the law of multiple proportion.

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

Theoretically, how many moles of carbonic acid will be produced by 3.00 g sample of NaHCO3?

Please login to view the answer

Login
Join us

Posted in Chemistry

Write electron configurations for these atoms and ions, and comment on the result. a.) Ar b.) Cl- c.) S2- d.) P3-

Please login to view the answer

Login
Join us

Posted in Chemistry

A student added 25.0 uL of a solution of magnesium chloride to a microcentrifuge tube along with a color changing indicator, and titrated with 1.00 x 10−2 M EDTA to the endpoint. The color change occurred at 21.7 uL. What was the [Mg₂+]?

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

Two solutions, initially at 24.69°C, are mixed in a coffee cup calorimeter (Ccal = 105.5 J/°C). When a 200.0 mL volume of 0.100 M AgNO3 solution is mixed with a 100.0 mL sample of 0.100 M NaCl solution, the temperature in the calorimeter rises to 25.16°C. Determine the DH°rxn, in units of kJ/mol AgCl. Assume that the density and heat capacity of the solutions is the same as that of water. a. -78 kJ/mol AgCl b. -25 kJ/mol AgCl c. -64 kJ/mol AgCl d. -32 kJ/mol AgCl e. -59 kJ/mol AgCl

Please login to view the answer

Login
Join us

Posted in Chemistry

What is the mass in grams of 6.022×1023 atoms of mass 16.00 amu?

Please login to view the answer

Login
Join us

Posted in Chemistry

In an exactly.200M solution of benzoic acid, a monoprotic acid, the [H+] = 3.55 × 10–3M. What is the Ka for benzoic acid?

Please login to view the answer

Login
Join us

Online Tutors To Help You

Posted in Chemistry

1.You have three elements, A, B, and C, with the following electronegativity values: A = 0.9 B = 3.0 C = 3.5 You react the elements to form the substances AB, AC, and BC. Answer the following questions: •What type of substance is AB? What types of bonds are present? Explain your answer. •What type of substance is AC? What types of bonds are present? Explain your answer. •What type of substance is BC? What types of bonds are present? Explain your answer. •If any of the substances are ionic compounds, which element is the cation and which is the anion? Explain your answer.

Please login to view the answer

Login
Join us

Posted in Chemistry

When a solution of barium nitrate and a solution of copper (II) sulfate are mixed, a chemical reaction produces solid barium sulfate, which sinks to the bottom, and a solution of copper (II) nitrate. Suppose some barium nitrate is dissolved in 120.00 g of water and 8.15 g of copper (II) sulfate is dissolved in 75.00 g of water. The solutions are poured together, and a white solid forms. After the solid is filtered off, it is found to have a mass of 10.76 g. The mass of the solution that passed through the filter is 204.44 g. What mass of barium nitrate was used in the reaction?

Please login to view the answer

Login
Join us

Posted in Chemistry

An atom of selenium (Se) forms a monatomic ion. Which of the following ions does is most likely form? Possible answer choices: Se^2+ Se^6- Se^6+ Se^2-

Please login to view the answer

Login
Join us

Online Tutors To Help You