A chemist determined by measurements that 0.045 moles of calcium participated in a chemical reaction. Calculate the mass of calcium that participated in the chemical reaction. Be sure your answer has the correct number of significant digits.

Q: Calculate the pH of the following solutions.  - 0.10 M pyridine

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Q: Calculate the pH of a 0.859 M NaF solution. Assume Ka(HF) = 1.0 x 10-4

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Q: What are the reaction products of (R)-3-methylcyclohexene in the reaction sequence of hydroboration-...

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Q: Show a possible mechanism for the following reaction 1) EtMgBr (excess) 2) H20 Et OH Me ..Me "CI "Et...

A: Answer: This is characteristic reaction of epoxide compounds where ring opening is taking place in b...

Q: The compound potassium cyanide is a strong electrolyte. Write the reaction when solid potassium cyan...

A: When strong electrolyte is added to water , it breaks into its corresponding ions . equation is give...

Q: What is the pH of a 0.159 M aqueous solution of ammonium perchlorate, NH4ClO4 ? pH =  This solutio...

A: Given, Concentration of ammonium perchlorate (NH4ClO4) aqueous solution = 0.159 M   

Q: Magnesium hydroxide is poorly soluble in pure water but dissolves quite well in pH 7.0 buffer. This ...

A: We would first write solubility equation of Magnesium hydroxide and use the significance of buffer s...

Q: Describe the formation of metal complex with octahedral geometry using all the orbitals of same ener...

A: The formation of an octahedral complex using the orbitals of same energy level.    Since you have as...

Q: 2. The pH of a solution is 3.4. Calculate [H,O for this solution

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Q: Liquid octane (CH;(CH,) CH,) reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (...

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Q: What is the change in volume for a system under a constant 2 atm pressure that releases 807 J of hea...

A: given :-  heat released = 807 J  constant pressure = 2 atm  change in internal energy = -300.5 J  1 ...

Q: A chemical engineer is studying the following reaction: HCH;CO,(aq)+CH,NH,(aq) → - CH;CO,(aq)+CH;NH(...

A: Qc and Kc are calculate the same way, but Qc is used to determine which direction a reaction will pr...

Q: Determine the pH at the equivalence (stoichiometric) point in the titration of 44.27 mL of 0.138 M m...

A: Given data : Concentration of morphine = 0.138 M Volume of morphine = 44.27 mL Concentration of HCl ...

Q: How does ammonia, dimethylglyoxime (DMG), and 8-hydroxyquinoline (8HQ) interact with your cations, l...

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Q: Use the table of solubility rules for ionic compounds in water to predict whether each of the follow...

A: • The given ionic compounds are -      NaI , PbS , AgCl , LiCl , FeO and KOH    • We need to determi...

Q: Which beaker contain a bas in PH 1 PH 6 PH 7 PH 12 1) 2) 3) 4) O A. Beaker 1 and7 O B. Beaker 2 O C....

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Q: Give ONE (1) example each for natural and synthetic polymers.

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Q: "Synthesis gas" is a mixture of carbon monoxide and water vapor. At high temperature synthesis gas w...

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Q: Write the balanced net ionic equation for the precipitation of iron(II) carbonate from aqueous solut...

A: In a precipitation reaction, two aqueous solutions are reacted to produce a salt that is insoluble i...

Q: Mercury is an environmental pollutant because it can be converted by certain bacteria into the very ...

A: This problem is solved by the unitary method. Given mass of mercury is 241 tons and 1.9% of this amo...

Q: A 12.3 g sample of an alloy of Mg and Al produces 1.66 mol of H2 when added to excess HCI. What perc...

A: Given, Mass of the sample = 12.3 g  Mass of H2 gas produced = 1.66 mole  What is the percentage of M...

Q: What is the IUPAC name for the following compound?

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Q: The carbon chlorine bond in chloromethane (CH3Cl) has a bond distance of 178 pm.  Assuming a 100% io...

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Q: The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quant...

A: According to Pauli Exclusion principle no two electrons in an atom can have the same four quantum nu...

Q: Write at least two reactions that show enthalpy. State the reactants and the products of the reactio...

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Q: calculate the frequency of a photon emitted by a hydrogen atom when an electron makes a transition f...

A: Calculate frequency of photon....

Q: HBr (excess) peroxides

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Q: A bicyclist is stopped at the entrance to a valley, as sketched below: A E B Where would the bicycli...

A: Answer: This question is based on energy conservation, which suggests that energy can not be created...

Q: To make a buffer from a mixture of HF and NaF that has a pH = 3.35 what must the ratio of (F^-/HF) b...

A: a buffer of a weak acid and its conjugate base, HF and NaF. given, pH = 3.35 Ka = 7.2 x 10-4

Q: In a study of the decomposition of hydrogen iodide on a gold surface at 150 °C HI(9)-Va H2(9) + V½ I...

A: We have to study the units and determine the order of reaction along with rate constants.

Q: b) Please draw a reasonable mass spectrum for the following compound of formula C4H100 (MW = 74). Fo...

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Q: One mixes AgNO3 and NaCl. A precipitate forms. That precipitate is: a) AgNa    b)  NO3Cl    c)  AgCl...

A: Precipitation Reaction : The chemical reaction occurring in an aqueous solution where two ionic bond...

Q: The combustion of propane may be described by the chemical equation   C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(...

A: Balance chemical equation :  C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(g)  Given data : Mass of propane = 14.7 g  ...

Q: (i) Identify the different enthalpy changes and construct the Born-Haber cycle for the formation of ...

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Q: Gaseous ammonia chemically reacts with oxygen (0,) gas to produce nitrogen monoxide gas and water va...

A: Given :-  NH3(g) + O2(g) → NO(g) + H2O(g)  No.of moles of O2 = 0.700 mol  To calculate :-  No.of mol...

Q: 4. During the process of freezing, what do you know about changes in the temperature and entropy of ...

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Q: (b) What are oxidative addition and reductive elimination steps in a catalytic eycle?

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Q: When an equilibrium mixture of A(aq) and B(ag) is placed in a hot water bath, the solution turns blu...

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Q: Arrange the following compounds in order of decreasing reactivity for a nucleophilic substitution re...

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Q: Calculate the mass of Kr in a 8.57 L cylinder at 96.6 °C and 4.48 bar. mass: g

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Q: What weight of KCN is equivalent to 30.00 mL of AGNO3 solution containing 15.00 g/liter (a) by the V...

A: In the given problem, the amount of KCN that will be equivalent to 30.00 mL of AgNO3 solution having...

Q: (a) Discuss the stepwise mechanism for the hydrogenation of alkenes using Willkinson's catalyst by t...

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Q: deoxyribonucleic acid is a Model

A: In this question we have to identify the X-ray diffraction and the discovery of the structure of deo...

Q: Part A Nitric oxide reacts with chlorine gas according to the following reaction: 2 NO (g) + Cl2 (g)...

A: The given chemical reaction is as equilibrium and the reaction is as follows: 2NOg + Cl2g ⇌ 2NOClg A...

Q: EXERCISE 3.2 Predict the structures of the following ions. Include a description of distortions from...

A: Dear student, since you have asked a question which has multiple subparts according to guidelines we...

Q: For each chemical reaction listed in the first column of the table below, predict the sign (positive...

A: Entropy is the randomness constituent. Let us discuss the increase and decrease in entropy. 

Q: What mass of AI, O, is produced when 19.0 L of O, gas react with Al at 506 K and 5.25 atm. 4 Al(s) +...

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Q: For the following reaction, 126 grams of silver nitrate are allowed to react with 27.9 grams of copp...

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Q: 4. Rank the following Acids from strongest to weakest a) K, = 4 x 106 b) pK, = 3.8 C) K, = 2 x 10-3 ...

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Q: At a certain temperature, the equilibrium constant K for the following reaction is 1.3: CL(e) + CHCI...

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.