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Chemistry

Guest

Combustion of 7.54 g of liquid benzene (C6H6) causes a temperature rise of 50.3°C in a constant-pressure calorimeter that has a heat capacity of 6.27 kJ/°C. What is ∆H for the following reaction? C6H6 (l) + O2 (g) → 6CO2 (g) + 3H2O (l)

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Chemistry

Cody Nguyen

What is the compound name for the ion chemical formula AgBr?

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Chemistry

Cheyenne Newton

Which principal energy level of an atom contains an electron with the lowest energy?

A) n=1

B) n=2

C) n=3

D) n=4

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Chemistry

Raymond Nielsen

Are erasers made from rubber?

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Chemistry

Randall Ashley

The specific heat of nickel is 0.44 J/g*⁰C. How much energy needed to change the temperature of 95.4g of nickel from 32⁰C to 22⁰C. Is the energy absorbed or released?

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Chemistry

Riley Sexton

What compound do the ions Al3 + and O2 - form

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Chemistry

Cross

Draw every stereoisomer for 1,2-difluoro-1,2-dimethylcyclopentane. use wedge-and-dash bonds for the substituent groups, and be sure that they are drawn on the outside of the ring, adjacent to each other. the skeletal structure of one molecule is included to indicate the proper format; modify the x/'s on the given structure to create the first stereoisomer.

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Chemistry

Guest

Suppose an ice cube weighing 36.0 g at a temperature of 10°C is placed in 360 g water at a temperature of 20°C. Calculate the temperature after thermal equilibrium is reached, assuming no heat loss to the surroundings. The enthalpy of fusion of ice is Hfus 6.007 kJ mol 1, and the molar heat capacities cP of ice and water are 38 and 75 J K 1 mol 1, respectively.

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Chemistry

Kinsley Olsen

Why can't all the mixtures be classified as solutions?

A. Not all mixtures are heterogeneous

B. Not all mixtures are homogeneous

C. Not all mixtures have solutes and solvents

D. Mixtures are made of only one substance.

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Chemistry

Boston

Which of the following is a homogeneous mixture? A) Molten ironB) Stainless steelC) Trail mixD) Water

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Chemistry

Guest

State the general relationship between temperature of the water and the amount of the salt that will dissolve in the water

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Chemistry

Alvin Cuevas

Consider a triprotic acid like phosphoric acid or citric acid. which expression correctly describes the relative magnitudes of the three ka equilibrium constants?

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Chemistry

Linda Escobar

If 14g of ethene reacts with excess amount of steam to give 17.25g of ethanol what is the percentage yield

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Chemistry

Saul Collier

The electrical conductivity of an aqueous solution depends on the concentration of which particle in the solution

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Chemistry

Emely Woodward

What changes in physical properties can be used as evidence that a chemical reaction has occured?

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