25,963 Answered Questions for the topic chemistry

Chemistry

12/07/24

The vapor pressure of water at this temperature is 18.0 mm Hg.
A common way to produce hydrogen gas in the laboratory is to place ametal such as zinc in hydrochloric acid. A single replacement reactionproduces hydrogen gas. Suppose a student carries out this... more
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Chemistry

12/06/24

Two 20.0g ice cubes at -20C are placed into 275g water at 20C. Assuming no energy in transferred to or from the surroundings, what is the final temperature of the water after all the ice melts?
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Chemistry

12/05/24

Platinum NEED ANSWERED ASAP
how many electrons are in an ion of your atom after losing or gaining ve-
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Chemistry

12/04/24

Identify the best and two worst structures that were drawn for N3- (select three overall)
The inflation of an air bag when a car experiences a collision occurs by the explosive decomposition of sodium azide, Na3, which yields nitrogen gas that inflates the bag. The following resonance... more
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Chemistry

12/04/24

Find the grams of the reactants at equilibrium and Find the initial grams of ammonia
Given Nitrogen gas + Hydrogen gas react to make ammonia at EQ. Kc and molarity of AMMONIA are given at equilibrium. You have to use the Kp concert to Kc and the given molarity to find X in a rice... more
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Chemistry

12/02/24

Calculate the pH of this solution.

Calculate the pH of this solution. Round to the nearest hundredth.pOH = 3.45
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Chemistry Biology

12/01/24

Cell respiration and photosynthesis
1.Why is much needed in substrate linked reactions molecules such as NAD and FAD?2.In the electron transport chain to what is useful that the oxygen acts as a final electron acceptor?3.And how... more
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Chemistry

11/27/24

If I have 0.0017 mol Mg on the reactant side of the following equation, how many moles of H2 would be produced? Mg (s) + 2 HCl (aq) → Mg Cl2(aq) + H2 (g)
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Chemistry

11/27/24

Determine Molar Solubilty
Given solubility product of PbBr2 is 4.45*10^-6, determine molar solubility in a 0.318 M Pb(NO3)2 solution.
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Chemistry

11/25/24

what is delta h
Limestone stalactites and stalagmites are formed in caves by the following reaction: A* (aq) + 2HCO3 (aq) → CaCO3(s) + CO2(g) + H20(l) If 1 mol of CaCO forms at 298 K under 1 atm pressure, the... more
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Chemistry Biology

11/24/24

IB Biology HL 2, How do you do the calculation of uncertainty for independent and dependent variables obtaiend without a measuring tool/apparatus?
For an essay assessment in biology, I need to calculate my uncertainty for my independent and dependent variable. However, my independent variable is vocal technique (mixed voice, head voice, chest... more
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Chemistry

11/24/24

How to calculate molarity from a solution’s concentration and volume?
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Chemistry

11/24/24

Concentration Question
A product gives the instructions to use 1mL of product per L of water. Using this ratio, calculate the concentration of Cu2+ (in mol/L) that the product must have to achieve the desired 1ppm Cu2+.
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Chemistry

11/21/24

How to get ion size using Debye-Huckle question
Given the activity coefficients for an ion with z = 2 in solution as a function of the ionic strength. Find the ion size, α, of this species. ie Given data is Ionic Strength and Activity Coefficient
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Chemistry Science

11/21/24

Hi! So for this question my teacher is saying that 4 bars into the circle is correct. Can anyone explain why?
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Chemistry

11/19/24

Thermodynamics question
What would be the final temperature of the system if 28.4 g of lead at 136 degrees C is dropped into 24.7 g of water at 5.77 degrees C in an insulated container. The specific heat of lead is 0.128... more
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Chemistry

11/19/24

Chemistry pre-Lab 12
a. Balance the following reaction in an acidic solution. Fe2+ + Cr2O7^2- → Fe3+ + Cr3+b. When a 0.80 g sample of an unknown Fe2+ salt is titrated with 0.0285 M K2Cr2O7, it is found that 59.2 mL of... more
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Chemistry

11/19/24

Thermochemistry Exercises 11
A piece of metal (34.9 g) was heated to 95.0 degrees Celsius and then added to 550-g water having an initial temperature of 28.2 degrees Celsius. If the final temperature of the water and the metal... more
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Chemistry

11/19/24

Thermochemistry Pre-Lab 10
A. A sample of 0.72 g of Al is reacted with 17.0 mL of 2.4 M KOH. Which one is the limiting reagent?2Al (s) + 2KOH (aq) + 6H2O (l) → 2KAl(OH)4 (aq) + 3H2 (g)B. Calculate the theoretical yield of... more
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Chemistry

11/18/24

Quantitative Analysis Chemistry

Calculate [HY3−] in a solution prepared by mixing 10.00 mL of 0.0335 M VOSO4, 9.90 mL of 0.0335 M EDTA, and 10.00 mL of buffer with a pH of 4.00. At ph 4 Values of αY4- for EDTA at 25°C and μ =... more
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Chemistry

11/17/24

Thermochemistry Experiment 8 Excercises
A 19.80 mL solution of NaOH is required to titrate 0.6014 g KHP. How many mL of this NaOH solution required to titrate 25.0 mL of 0.10 M HCL solution? Show work!
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Chemistry

11/17/24

Thermochemistry Pre-Lab Assignment 11
A 56.3-g sample of water was heated to 51.2 C and added to 45.8 g of 20.3 C water in a calorimeter. Assume that no heat was lost to the surroundings including the calorimeter. Assume that no heat... more
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Chemistry

11/17/24

Add a child to my account

The email on file is mine and I'm the one to decide which tutor to go with. How do I add my child so they can be in contact with the tutor themselves?Do they each have to open accounts? We're in... more
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Chemistry

11/17/24

Could someone please help me?
Using the following balanced equation: 4K + O2 → 2K2O How many grams of potassium oxide (K2O) are formed from 8.1 g of oxygen (O2) reacting with excess potassium?
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Chemistry

11/16/24

Can someone please help me?
Using the balanced chemical equation: H2 + Cl2 → 2HClHow many grams of hydrochloric acid (HCl) are produced from 2.7 g of chlorine (Cl2) reacting with excess hydrogen? 
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