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Chemistry

Guest

For an alloy containing 50% cu and 50% ni, calculate the amounts of solid s and liquid l presents at 1300c. show that the total nickel content in the solid and liquid phases adds up to 50%. (5')

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Chemistry

Guest

Why science can answer some questions, but not others

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Chemistry

Maxim Mann

Calculate the theoretical yield of ammonia produced by the reaction of 100g of H2 gas and 200g of N2 gas

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Chemistry

Kallie Rivas

Balance the following chemical equation.

Mg + N2 → Mg3N2

A. 3 Mg + N2 → Mg3N2

B. 3 Mg + 2 N2 → Mg3N2

C. 6 Mg + 2 N2 → 3 Mg3N2

D. Mg + N2 → Mg3N2

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Chemistry

Malakai Reeves

Which of the following correctly categorizes the following infectious agents?

1. Viruses-living; bacteria-living

2. Viruses-nonliving; bacteria-nonliving (this answer choice is wrong)

3. Bacteria-nonliving; viruses-living

4. Bacteria-living; viruses-nonliving

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Chemistry

Van

A student wants to compare how easily a metal and a plastic spoon of the same temperature can transfer thermal energy. Which of the following activities should the student perform?

Measure the effort required to bend each spoon.

Place an ice cube on each spoon and record the rate of melting of the cubes.

Place the spoons at room temperature and record the change in temperature of each.

Measure the change in weight of the spoons after placing them in the freezer for a few minutes.

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Chemistry

Sergio Roth

What is the molar mass of a compound?

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Chemistry

Alonzo Meza

an element has an isotope with a mass of 203.973 amu and and abundance of 1.40%. another isotope has a mass of 205.9745 amu with an abundance of 24.10%. a third isotope weighs 206.9745 amu and is 22.10%, and the fourth isotope weighs 207.9766 amu and an abundance of 57.40. calculate the average atomic mass and identify the unknown element.

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Chemistry

Delaney Marquez

How can the use of biotechnology lead to an increase in soil conservation practices?

a.

Biotechnology use can lead to a decrease in pesticide and herbicide use, maintaining soil quality.

b.

Biotechnology use can lead to soil compaction, preventing erosion.

c.

Biotechnology use can increase the amount of management required for agriculture, increasing the likelihood of the practice of soil conservation.

d.

All of the above

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Chemistry

Nicolas Hurst

The table shows the properties of some organic compounds.

Compound A: has only carbon and hydrogen atoms.

Compound B: has a nitrogen atom

which statement best identifies compounds A and B?

a) compound a is an ether and compound b is an alcohol

b) compound a is an alcohol and compound b is an ether

c) compound a is a hydrocarbon and compound b is an amine

d) compound a is an amine and compound b is a hydrocarbon

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Chemistry

Yuliana Frey

How to calibrate a burette

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Chemistry

Todd Weeks

What is the meaning of semipermeability?

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Chemistry

Brogan Hunter

What is the oxidation number of oxygen in HSO4-?

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Chemistry

Abdullah

Which statement about Clinton s impeachment is true?

A. Clinton s impeachment was supported by the majority of Americans.

B. The impeachment charges were based on fraud found during the Whitewater investigation.

C. It was clear from the beginning of the impeachment trial that there were not enough votes in the Senate to convict.

D. Most congressional Democrats were convinced that the charge of perjury met the standard required by the Constitution for impeachment

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Chemistry

Zhang

The value of partition function at 0 k should be

a. zero

b. infinity

c. 1

d. 10^25

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