Chemistry » Page 5

Chemistry

Nolan Ward

Which of he following compounds is always part of an aqueous solution

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Chemistry

Lorelai Hunter

Which of the following reaction is NOT a step in the formation of sodium chloride

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Chemistry

Harper Benton

Potassium permanganate (KMnO4) reacts with hydrochloric acid (HCl) to form potassium chloride (KCl), manganese chloride (MnCl2), water (H2O), and chlorine gas (Cl2). The balanced chemical equation is 2KMnO4 + 16HCl → 2KCl + 2MnCl2 + 8H2O + 5Cl2. Select the correct ratios of each of the following substances.

KMnO4:KCl =

HCl:H2O =

KMnO4:Cl2 =

HCl:MnCl2 =

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Chemistry

Patience Lamb

A mixture of He

, N2

, and Ar

has a pressure of 13.6

atm at 28.0

°C. If the partial pressure of He

is 1831

torr and that of Ar

is 997

mm Hg, what is the partial pressure of N2

?

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Chemistry

Kaitlynn Hernandez

Na and ci are chemical (symbols, formulas).

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Chemistry

Bear

9 of 2

Which is an example of an Arrhenius base?

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Chemistry

Kamden

What is the molecular formula for the compound with a formula mass of 58.12 and an empirical formula of c2h5?

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Chemistry

Malik

List three liquids used in thermometers

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Chemistry

Daniela Grimes

How come a pufferfish has spines?

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Chemistry

Landry

Copper (i) ions in aqueous solution react with nh3 (aq) according to

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Chemistry

Corinne Conner

Is tamarind a natural indicator? Give reasons.

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Chemistry

Demetrius Warren

Describe how surface currents would be affected if earth did not rotate

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Chemistry

Clara Mclaughlin

Estimate the heat released when ethene (CH2=CH2) reacts with HBr to give CH3CH2Br.

Bond enthalpies are:

C--H : 412 kJ/mol; C--C : 348 kJ/mol

C=C : 612 kJ/mol; C--Br : 276 kJ/mol;

Br--Br : 193 kJ/mol; H--Br : 366 kJ/mol.

a) 470 kJ/mol b) 200 kJ/mol c) 58 kJ/mol d) 1036 kJ/mol e) 424 kJ/mol

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Chemistry

Jamie Peterson

A 12.5 g sample of granite initially at 82.0 oc is immersed into 25.0 g of water that is initially at 22.0 oc. what is the final temperature of both substances when they reach thermal equilibrium? (specific heat capacity of water = 4.18 j/g. oc and specific heat capacity of granite = 0.790 j/g. oc)

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Chemistry

Underwood

Calcium has three different isotopes. One has a mass of 35 amu; another has a mass of 41 amu; and another has a mass of 40 amu. Calculate the average atomic mass of calcium.

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