Chemistry » Page 28

Chemistry

Jaylynn Mccann

Which is an unreliable source?

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Chemistry

Keith Dunlap

Lilah runs 6m/s. how long will it take her to run 42 meters

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Chemistry

Braelyn Leblanc

A substance that forms a vapor is generally in what physical state at room temperature?

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Chemistry

Dania Burke

Standard pressure is 101.3 KPa, which is equal to 760. o mmHg. If gas has a pressure of 545 mmHg, what is its pressure in KPa to the proper number of significant figures?

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Chemistry

Deborah Baird

What is the name of the element with a valence electron configuration of 4s^2

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Chemistry

Bianca Riley

How many hours is 10:00 am to 4:45 pm?

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Chemistry

Karsyn Marshall

If you sprayed an air freshener, where would the highest concentration of air freshener be found?

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Chemistry

Cody Salinas

For each molecule below, specify the polarity of the bonds and the overall polarity of the molecule.? Are the bonds for each one polar or non polar? Are the molecules for each one polar or non polar? BeCl2 O3

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Chemistry

Tatum Leonard

The characteristics of a certain gas are listed in the table.

Characteristics of a Gas

Characteristic Description

Compound

Chlorine gas

Condition

STP

Mass

3.2 grams

What is the expected density of the above sample of gas?

03.16 g/L

1.58 g/L

1.21 g/L

1.03 g/L

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Chemistry

Kaden

Determine which decay process is being described in each case. the atomic number deceases by one, and the atomic mass is unchanged. the atomic number decreases by two, and the atomic mass decreases by four. the atomic number increases by one, and the atomic mass remains unchanged.

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Chemistry

Easton Castaneda

What kind of changes occur between atoms when substances undergo chemical reactions?

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Chemistry

Greta Nelson

What is the most stable part of the periodic table of elements

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Chemistry

Dwayne Vaughan

2. A solution of potassium cyanide, KCN, is made by dissolving 3.2 g of KCN in water. When this solution reacts with excess hydrochloric acid, HCl, it produces 0.30 g of poisonous hydrogen cyanide gas, HCN.

KCN + HCl - > KCl + HCN

(a) Calculate the theoretical yield of HCN.

hCalculate the percent yield of HCN.

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Chemistry

Toodles

Which is correct for kinetic particle theory. (It can be all correct or 2 of them correct)

A. In a solid, the particles are close together

B. All particles move at a constant speed

C. The higher temperature, the faster the particles move

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Chemistry

Leonidas Barrett

At what temperature will 6.21 g of oxygen gas exert a pressure of 5.00 atm in a 10.0-L container?

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