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2 years ago

Give one example of erosion. SCIENCE

Chemistry

1 answer:

strojnjashka [21]2 years ago

4 0

Answer: a rock being in one place over a long time and eventually wearing away

Explanation:

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Sufficient strong acid is added to a solution containing na2hpo4 to neutralize one-half of it. what will be the ph of this solut

Ivahew [28]

Assuming that the initial pH is pHi.
The initial concentration of [OH-] is
[OH]- = 10^(14 - pHi)

Since half of the Na2HPO4 is neutralized, the concentration of [OH-] will be reduced to half. The new pH will be
[OH-]/2 = 10^(14 - pHi)/2 = 10^(14 - pH)
14 - pHi - log 2 = 14 - pH
In terms of pHi,
pH = pHi + log 2

3 0

3 years ago

4. What is the specific heat of iron, if it requires 1050 J of heat energy to raise the temperature of

Sholpan [36]

Answer:

0.4589J/g°C

Explanation:

Heat energy = 1050J

Mass of iron = 220.0g

Initial temperature (T1) = 10°C

Final temperature (T2) = 20.4°C

Heat energy = mc∇T

Q = mc∇T

Q = heat energy

M = mass of the substance

C = specific heat capacity of the substance

∇T = change in temperature = T2 - T1

Q = m×c×(T2 - T1)

1050 = 220 × c ×(20.4 - 10)

1050 = 220c × (10.4)

1050 = 2288c

c = 1050 / 2288

C = 0.4589J/g°C

The specific heat capacity of iron is 0.4589J/g°C

4 0

3 years ago

Read 2 more answers

You have 500,000 atoms of a radioactive substance. After 2 half-lives have past, how many atoms remain?

Aleonysh [2.5K]

Answer:

125000

Explanation:

Because it is halved and halved again.

3 0

2 years ago

Read 2 more answers

Write the balanced equation for the reaction of aqueous Pb ( ClO 3 ) 2 with aqueous NaI . Include phases. chemical equation: Wha

Citrus2011 [14]

<u>Answer:</u> The mass of lead iodide produced is 9.22 grams

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of NaI = 0.200 M

Volume of solution = 0.200 L

Putting values in above equation, we get:

$0.200M=\frac{\text{Moles of NaI}}{0.200}\\\\\text{Moles of NaI}=(0.200mol/L\times 0.200L)=0.04moles$

The chemical equation for the reaction of NaI and lead chlorate follows:

$Pb(ClO_3)_2(aq.)+2NaI(aq.)\rightarrow PbI_2(s)+2NaClO_3(aq.)$

By Stoichiometry of the reaction:

2 moles of NaI reacts produces 1 mole of lead iodide

So, 0.04 moles of NaI will react with = $\frac{1}{2}\times 0.04=0.02mol$ of lead iodide

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of lead iodide = 461 g/mol

Moles of lead iodide= 0.02 moles

Putting values in above equation, we get:

$0.02mol=\frac{\text{Mass of lead iodide}}{461g/mol}\\\\\text{Mass of lead iodide}=(0.02mol\times 461g/mol)=9.22g$

Hence, the mass of lead iodide produced is 9.22 grams

6 0

3 years ago

Other oils, such as car oil and vegetable oil, also consist largely of bonded carbon and hydrogen atoms. Would you predict that

grigory [225]

Answer:

Car oil and vegetable oil will mix well with gasoline

Car oil and vegetable oil will not mix with water.

Explanation:

Car oil and vegetable oil will mix well with gasoline

Car oil and vegetable oil will not mix with water.

This is because of the rule of solubility. According to this rule, like substances will only dissolve like substances. In essence, a polar compound will only dissolve another polar compound. A non-polar compound will dissolve only in a non-polar solvent.

Water is polar and oil is non-polar. The cannot mix.

Gasoline is non-polar and will dissolve oil which is also non-polar .

7 0

3 years ago