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25,963 Answered Questions for the topic chemistry

Chemistry

01/30/24

Consider an ionic compound

Consider an ionic compound, M*X_{2} composed of generic metal M and generic, gaseous halogen X.• The enthalpy of formation of M*X_{2}*is*Delta * H_{1} ^ 2 = - 997kJ / m * ol• The enthalpy of... more

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Chemistry

01/30/24

calculate the amount of H2 formed?

1.6 mol Zn and 7.6 mol HCl react according to the equation Zn + 2 HCl −→ ZnCl2 + H2 . If the limiting reactant is Zn, calculate the amount of ZnCl2 formed. Answer in units of mol.Calculate the... more

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Chemistry

01/30/24

The specifi heat of a certain

The specific heat of a certain type of cooking oil is 1.75J /(g-^ C). How much heat energy is needed to raise the temperature of 2.48 kg of this oil from 23 deg * C 191 °C?I tried and got 729.12,... more

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Chemistry

01/30/24

Calculate the moles of O atoms in 0.603g of Ca(NO3)2. Round your answer to 3 significant figures.

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Chemistry

01/30/24

How many particles are represented by 22.9g H2O?

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Chemistry

01/29/24

Rate Laws and Method of Initial Rates

Consider the following rate law:How does the rate change when the concentration of [BrO3-] is doubled (all other concentrations remain the same)?I am confused on this problem, as when I try this... more

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Chemistry Biochemistry Organic Chemistry

01/28/24

Ascorbic acid in vitamin c tablet

We are doing a lab about vitamin C and titration of it. I have questions regarding this but the second question threw me off by asking for the moles of ascorbic acid in the erlenmeyer flask.What am... more

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Chemistry

01/28/24

Reverse osmosis

In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. Assume seawater has a colligative molarity of 1.10 M, and you want to... more

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Chemistry Organic Chemistry

01/28/24

1H NMR Spectroscopy

How many unique 1H NMR signals exist in the spectrum of 2,4-dimethylhexane?

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Chemistry

01/28/24

A graduated cylinder contains 24.0 mL of water. What is the new water level after 38.2 g of silver metal with a density of 10.5 g/mL is submerged in the water?

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Chemistry

01/26/24

What is the volume of 1.8 mol of O2 at STP

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Chemistry

01/25/24

ionic bonding question

Confused with question: Calculate the force of attraction (in N) between a cation with a valence of +1 and an anion with a valence of -3, the centers of which are separated by a distance of 9.8... more

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Chemistry

01/25/24

What is the final temperature of a system?

What is the final temperature of a system if 10.00 g of gold at 90.0°C is placed in 10.00 g of water at 28.00°C? The molar heat capacity of gold is 25.41 J/(mol · °C) and the heat capacity of water... more

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Chemistry

01/25/24

Calculate the enthalpy change per mole of H2SO4 in the reaction.

A 103.2 mL sample of 1.00 M NaOH is mixed with 51.6 mL of 1.00 M H2SO4 in a large Styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temperature... more

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Chemistry

01/25/24

Use this information and the additional information provided to calculate the ΔH°f of NaHCO3.

When 39.0 g NaHCO3 decomposes, the change in energy is-30.0 kJ. Use this information and the additional information provided to calculate the ΔH°f of NaHCO3.The Hf values are given belowH2O(l) =... more

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Chemistry

01/25/24

What is the temperature change of the skillet?

Exactly 18.4 mL of water at 31.0 °C is added to a hot iron skillet. All of the water is converted into steam at 100.0°C. The mass of the pan is 1.10 kg and the molar heat capacity of iron is 25.19... more

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Chemistry

01/24/24

If the maximum speed of the emitted photoelectrons is 3.87 × 10° m/s, what wavelength of electromagnetic radiation s surface and caused the ejection of the photoelectrons?

wavelength = m

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Chemistry Math

01/24/24

General equations as functions (proportional, inverse, or linear)

Identify each of the following general equations as functions that are: proportional, inverse, or linear In the following functions "x" and "y" are variables (x is the independent variable; y is... more

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Chemistry Algebra 1

01/21/24

Chem 1 - Units conversion problem

In the United States, water used for irrigation is measured in acre-feet. An acre-foot of water covers an acre to a depth of exactly 1 ft. An acre is 4840 yd2. An acre-foot is enough water to... more

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Chemistry Math Science Geometry

01/21/24

Displacement Question

Answer the following questions about path A in the figure. A city block is a square of l= 115 m on each side.Total Distance Traveled in meters: 460Magnitude of Displacement in meters: 363.7What is... more

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