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2 years ago

What causes water to runoff

Chemistry

2 answers:

Nadusha1986 [10]2 years ago

8 0

Answer:

Explanation:

Runoff occurs when there is more water than land can absorb so it would be C.

Alika [10]2 years ago

3 0

Answer:

Explanation:

The sun heats up earths surface

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Dissolving 16 g of urea (MW= 60 g/mol) in 39 g of water produces 42.3 ml of solution. Determine the molarity of this solution

Genrish500 [490]

Hey there!:

Molar mass urea = 60 g/mol

Number of moles of solute:

moles solute = mass solute / molar mass

moles solute = 16 / 60

moles solute => 0.2666 moles of urea

Volume in liters:

42.3 mL / 1000 => 0.0423 L

Therefore:

Molarity = moles of solute / volume of solution

Molarity = 0.2666 / 0.0423

= 6.302 M

Hope that helps!

8 0

2 years ago

Chemistry! Help! Please!

Ratling [72]

Question 1

The correct answer is a.

Explanation

The relationship between $pH$ and $pOH$ is given by

$pH + pOH = 14$ , We can use $pH=-log[H^+]$ and $pOH= -log[OH^-]$ . In a we are given the concentration of [OH] and so we use that to find the pOH, then from pOH we can find the pH.

$pOH= -log [2.4 \times 10^-^2] = 1.62\\\\pH = 14 - 1.62= 12.38$

$b.pH=-log(1.53 \times 10^-^2) = 1.82$

c. HCl is a strong acid so it dissociates to 0.0001 $H^+$ and 0.0001 $Cl^-$ , hence

$pH= -log[0.0001] = 4$

$d.pOH= -log [4.4 \times 10^-9] = 8.36\\\\pH= 14- 8.36 = 5.64$

$a.[OH^-] = 2.4 \times 10^-^2$ has a pH 12.36 which is greater than 7

Question 2

The correct answer is d $O_2(g)$ .

Explanation

This is because solids and liquids do not appear in the equilibrium constant expression. Since $K= \frac{[products]}{[reactants]}$ .

For the equation

$2PbS_(_s_) + 3O_2_(_g_) + C_(_s_) \implies 2Pb _(_s_) + CO_2_(_g_) + SO_2(_g_)$

$K= \frac{[CO_2][SO_2]}{[O_2]}$

Question 3

The correct answer is c

In a molecule the oxidation number are assigned to get the sum of a neutral charge or ion. The overall charge of $SO_4^2^-$ is -2 and in all its compounds oxygen has -2 charge, hence

$S+ 4O = -2\\S+4(-2)=-2\\\implies S= -2 +8 = +6$

Question 4

The correct answer is b. An oxidising agent must gain electrons in a reaction, thus it is the one that undergoes reduction.In order find out what is being reduced we write half reactions for molecules that change their state. $Ag^+$ and $K^+$ are spectactor ions in this reaction.

$Cl_2 + 2e \implies 2Cl^-\\\\NO_2 +H_2O \implies NO_3 +2H^+ +2e\\\\H^+ + OH^- \implies H_2O\\$

In the chloride half reaction $Cl_2$ gains electrons to become $Cl^-$ ions.

Question 5

The last element D is correct. When a nucleus decays by beta emission it produces a daughter nucleus that has same mass number but different atomic number. Therefore beta-decay will have equation

$\frac{187}{75} Re \implies \frac{187}{76} Os + \beta$

Question 6

The correct answer is a. A beta particle is an electron because it has a charge of -1 and has same mass as an electron, while a positron is a particle with the same mass as an electron but with a positive charge.

4 0

3 years ago

If a car produces 88 grams of co2 how many grams of o is used up in the reactionin c2h6o o2

Lera25 [3.4K]

B. (4.0 mol C2H6O) x (3/1) = 12 mol O2

C. Supposing all the C in the CO2 came from ethanol: 
(88 g CO2) / (44.00964 g CO2/mol) x (3/2) x (31.99886 g O2/mol) = 96 g O2 

D. (125 g C2H6O) / (46.06867 g C2H6O/ mol) x (2/1) x (44.00964 g CO2/mol) = 
239 g CO2 

(125 g C2H6O) / (46.06867 g C2H6O/ mol) x (3/1) x (18.01532 g H2O/mol) =

7 0

2 years ago

The solubility of a sample will ____________ when the size of the sample increases.

devlian [24]

The solubility of a sample will decrease when the size of the sample increases.

When the Size of sample is bigger, it means there is more particles that make up that sample so the amount of solvent to dissolve the sample will also be in the greater amount. Thus, when the sample size increases the solubility decrease. We can also say that size of sample and solubility are inversely proportional to each other.

8 0

2 years ago

What do weather and climate have in common? (3 points) a .Both affect average ocean temperatures.b. Both are averages measured o

aleksandrvk [35]

Answer:

Explanation:

4 0

3 years ago