04/23/19

The pH of a solution is 4, what should be the change in hydrogen ion concentration of the solution if its pH is to be increased to 5?
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04/23/19

Which element has the chemical symbol Na?
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04/23/19

What element begins with Z?
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04/23/19

pressure of ideal gas
What is the pressure of 10.5 mol of an ideal gas if it is at 75 Celsius and occupies a volume of 2.25 L?
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04/23/19

If a gas occupies 3.6L at a pressure of 1.00atm, what will it's volume be at a pressure of 2.5atm
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04/23/19

In the reaction 2KClO3(s) --> 2KCl(s) + 3O2(g) If 22.4 L of oxygen at STP are needed, how many moles of KClO3 must be decomposed?
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04/22/19

Which type of Bond
Predict the type of bond that would be formed between each of the following pairs of atoms: AtomsBond Type N and S _________ionic polar covalent nonpolar covalent H and H _________ionic polar... more
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04/21/19

How do you separate enantiomers?
There are some stereochemical reactions that result in the presence of enantiomers. When moving forward with a practical organic synthesis, how does one usually separate them in order to continue... more
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04/07/19

or the following equilibrium, if Ksp=5.2×10−12,

or the following equilibrium, if Ksp=5.2×10−12, what is the molar solubility of cadmium(II) carbonate?CdCO3(s)↽−−⇀Cd2+(aq)+CO2−3(aq) Report your answer in scientific notation with the correct... more
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04/07/19

How many grams of methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas?
A. 3.2 gramsB. 3.6 gramsC. 4.0 gramsD. 6.0 grams
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04/05/19

What is the enthalpy of the reaction as written?
When 0.690 g of sodium metal is added to an excess of hydrochloric acid, 7170 J of heat are produced. What is the enthalpy of the reaction as written?
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04/05/19

Order of Boiling Point
Arrange the following in decreasing order of Boiling point1. 3-Pentanol2. n-Pentane3. 2,2- Dimethylpropanol4. n-Pentanol
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04/03/19

Using the equation below, if we want 1.85 grams of CO2 how many moles of O2 will we need to react w/ excess CH4? CH4 + 2 O2 → CO2 + 2 H2O
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04/03/19

Which structure represents (R,Z)-5-methylhept-2-ene?
Which structure represents (R,Z)-5-methylhept-2-ene? https://imgur.com/a/p35gQbk
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04/01/19

Chemistry 102 UIUC heat capacity problem
a small statue, made of an unknown metal, weighs 500 g. this statue at room temperature (24.00 C) is placed in a beaker containing 1.00 L (1000 g) of 100.00 C water is allowed to sit until the... more
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03/31/19

chemistry question
A weather balloon is filled with 180.0 L of He and launched from sea level (T = 20.0°C, P = 755 torr). The balloon is designed to continue its ascent to an altitude of 30.0 km where it bursts,... more
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03/31/19

Calculate the percent water in iron(II) sulfate heptahydrate
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03/31/19

Empirical formula?

A compound is formed when 0.300 moles of barium combine with 0.600 moles of chlorine. What is the empirical formula for this compound?
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03/29/19

A 50.16 g sample of a substance is initially at 23.2 °C. After absorbing 2729 J of heat, the temperature of the substance is 196.3 °C. What is the specific heat (SH) of the substance?
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03/26/19

What is the percent strength (w/w) of a drug if 50mg of a drug is added to 150mg of diluent?
Pharmacy Technician calculations question
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03/22/19

How many liters of H 2 would be formed at 624 mm Hg and 14 ∘ C if 21.0 g of zinc was allowed to react?

How many liters of H2 would be formed at 624 mm Hg and 14 ∘C if 21.0 g of zinc was allowed to react?
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03/22/19

Using the standard heats of formation that follow, calculate the standard enthalpy change for the following reaction. 2NH3(g) + 3N2O(g)4N2(g) + 3H2O(g)

Using the standard heats of formation that follow, calculate the standard enthalpy change for the following... more
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03/21/19

Chemistry chem chem chem..!1
What volume of a 6.0M solution of NaOH would be required to neutralize 135.0mL of a 0.50M solution of HCI?
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03/21/19

Chemistry chemi$try
200.0L of a solution of H2SO4 of an unknown concentration is titrated with a 2.4-M solution of KOH. If it takes 124mL of KOH to reach the endpoint, what is the concentration of H2SO4?
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03/21/19

CHEMISTRY CHE,M CHEM
How much of a 1.4 M solution of NaOH will neutralize 250.0mL OF HNO3 with a molarity of 3.5M?
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