11/23/20

Need an answer to this chemistry problem. Thank you!
A chemist ran a particular reaction at different temperatures to determine the activation energy of the reaction. The plot of his data displayed the following linear regression. Determine the... more
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11/23/20

Please help!!!!!
Determine the rate law and the value of the rate constant (k) from the data given below. Include units on the rate constant.   Experiment [A] (M) [B] (M) Initial rate (M/s) 1 0.50 0.60 2.0 x... more
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11/23/20

Determine the mass of 1.57 kmol sulfure trioxide .

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11/23/20

For each of the following, indicate if the number of half-lives elapsed is:
For each of the following, indicate if the number of half-lives elapsed is:1. one half-life2. two half-lives3. three half-lives a sample of Ce-141 with a half-life of 32.5 days after 32.5 days a... more
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11/23/20

Which two elements should have exactly two unpaired 4d electrons?

Which two elements should have exactly two unpaired 4d electrons?
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11/22/20

What is the pressure of a gas (in torr)
What is the pressure of a gas (in torr) that undergoes isothermal expansion from 312 torr in a balloon of volume 1.61 L to a new volume of 3.56 L?
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11/22/20

please help on this questions

1.At what temperature was thermal equilibrium reached? How long did it take to arrive at this temperature?2.How does the temperature change within the first 60 seconds of the experiment? Within the... more
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11/22/20

what is the difference in energy
A 100 g sample of a hypothetical metal alloy (specific heat capacity = 0.406 J/g•°C) is cooled in an ice bath (assume the metal reaches the freezing point of water). It is dried and placed in a... more
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11/22/20

What is the molarity of a hydrochloric acid (HCl) solution if 20.0 mL of 0.0952 M sodium hydroxide (NaOH) is needed to neutralize 10.5 mL of the acid solution?
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11/22/20

How many bonds can sodium, magnesium, calcium, and chlorine each form? What type of bond is each element?
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11/21/20

How might you separate all of the dyes on one piece of chromatography paper?
If you are presented with an analyte that comprises a complex mixture of several dyes and you determine that one solvent provides good separations for one group of dyes but poor separation for... more
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11/21/20

a. If 2.9 x 1024 molecules of hydrogen gas reacts with excess nitrogen gas, what volume of NH3 should be produced
Balanced chemical equation: 2 NH 3 (g] → N2(g]+3 H2(g)b. If 88.5 L of ammonia gas is trapped and measured, what is the percent yield of ammonia in this equation
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11/21/20

What is the molecular formula of the compound that contains 39.45% K, 12.12% C, and 48.43% O and has a molecular mass of 396.44 g/mo
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11/21/20

In an experiment to determine the % of water (by mass) in hydrated CuSO4, the following data was recorded:
mass of evaporating dish 21.35g mass of evap dish and hydrated CuSO4  22.35g mass of evap dish and anhydrous CuSO4  21.99g  Find the % of water in the hydrate
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11/21/20

What is the energy value
A 2.5 g sample of a pretzel is burned completely. The heat it gives off is used to heat 45 g of water from 22 °C to 51 °C. What is the energy value of the pretzel in kcal/g? 
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11/21/20

What ion/atoms are isoelectronic?
SeleniumMagnesiumBromineNitrogenKryptonZincBarium IronBromideBarium cationIron (III)Selenide
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11/21/20

to raise the temperature
 How many calories are required to raise the temperature of 198 grams of water from 38 °C to 92 °C? 
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11/21/20

what is the specific heat of this metal object in J/g °C?

A metal object with a mass of 21 g is heated to 100 °C and then transferred to a calorimeter containing 57 g of water at 22 °C. If the water and metal object reach a final temperature of 27 °C,... more
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11/21/20

Help me work out density please!!
If you dissolve 52.5 g of salt in 3.45 l of water, what is the density of that solution of salty water? In this particular example, assume that the total volume doesn’t change when salt is added to... more
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11/21/20

In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy
Based on ion sizes, arrange these compounds by their expected lattice energy.Note that many sources define lattice energies as negative values. Please arrange by magnitude and ignore... more
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11/21/20

errors question
what kind of error is this: Not being consistent in determining what a drop of indicator ishuman errorrandom errorsystematic error
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11/21/20

What shape will a molecule have if there are 2 bonding electron pairs and 1 non-bonding electron pair around a central atom? What is the orbital hybridization on the central atom?
What shape will a molecule have if there are 2 bonding electron pairs and 1 non-bonding electron pair around a central atom?  What is the orbital hybridization on the central atom?
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11/21/20

i need help on chemistry

Does the amount of energy released or absorbed by the system increase or decrease as the amount of CaCl2 is increased (from reaction 1 to reaction 2)? Explain.
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11/21/20

help on chemistry

How does the temperature change within the first 60 seconds of the experiment? Within the last 60 seconds?
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11/20/20

i need help please

At what temperature was thermal equilibrium reached? How long did it take to arrive at this temperature?
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