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Step2247 [10]
4 years ago
7

Because many substances dissolve in water, it is considered a universal solvent. which property of water explains this phenomeno

n?

Chemistry
1 answer:
MatroZZZ [7]4 years ago
5 0
Here we go, this is from an essay I once wrote, hope it helps.

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Calculate the reaction quotient Qp for the following redox reaction: 14H+ + Cr2O72- + 6Cl- ----> 2Cr3+ + 3Cl2 + 7H2O The reac
stich3 [128]

Answer:

Value of Q_{p} for the given redox reaction is 1.0\times 10^{-8}

Explanation:

Redox reaction with states of species:

14H^{+}(aq.)+Cr_{2}O_{7}^{2-}(aq.)+6Cl^{-}(aq.)\rightarrow 2Cr^{3+}(aq.)+3Cl_{2}(g)+7H_{2}O(l)

Reaction quotient for this redox reaction:

Q_{p}=\frac{[Cr^{3+}]^{2}.P_{Cl_{2}}^{3}}{[H^{+}]^{14}.[Cr_{2}O_{7}^{2-}].[Cl^{-}]^{6}}

Species inside third braket represent concentration in molarity, P represent pressure in atm and concentration of H_{2}O is taken as 1 due to the fact that H_{2}O is a pure liquid.

pH=-log[H^{+}]

So, [H^{+}]=10^{-pH}

Plug in all the given values in the equation of Q_{p}:

Q_{p}=\frac{(0.10)^{2}\times (0.010)^{3}}{(10^{-0.0})^{14}\times (1.0)\times (1.0)^{6}}=1.0\times 10^{-8}

7 0
3 years ago
Which of the following lends itself to the use of a descriptive method? a. Jonathan would like to develop a hypothesis regarding
Marianna [84]

Answer:

a. Jonathan would like to develop a hypothesis regarding the role of parental expression of affection in reducing toxic stress in early childhood.

Explanation:

A descriptive method is commonly known as a research method for describing the properties or features of the research area being investigated. Descriptive research is usually conducted by studying the trends of the phenomenon without changing the value of any variable in the system. Thus, the correct answer is option a.

7 0
3 years ago
What volume of DI water, in mL, must you use to dissolve 30.0 g of NaOH in order to make a 1.25 M solution? mL (round to whole n
jeka57 [31]

Answer:

600mL

Explanation:

Molarity of a solution (M) = number of moles (n) ÷ volume (V)

number of moles = mass/molar mass

Molar mass of NaOH = 23 + 16 + 1

= 40g/mol

mole = 30/40

n of NaOH = 0.75mol

Using Molarity = n/V

V = number of moles ÷ molarity

V = 0.75 ÷ 1.25

V = 0.6L

In milliliters (mL), the volume of NaOH will be 0.6 × 1000

= 600mL

4 0
3 years ago
Describe the energy transformation when a match burns.
devlian [24]
The burning of a match is an exothermic reaction. Heat is being released as a result of the reaction.
3 0
4 years ago
Which of the solutions below will have the lowest ph? 0.10 m hbr 0.10 m hf 0.25 m hc2h3o2?
taurus [48]
PH value of 0.10 m of HBr, a strong acid. 
When dissolved in water it gives H+ and Br-, so H+ is the concentration.  
pH = - log H+) => pH = - log (0.10) = -(-1) = 1 
HF and HC2H3O2 are weak acids. They both will have pH value greater than 1 as they ionize in solution.
8 0
4 years ago
Read 2 more answers
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