If 6.75 g of NaOH are dissolved in 50.00 g of water and the temperature increases
from 20.5°C to 47.8 °C.
a. Is this an example of an endothermic or exothermic reaction?
b. What is the q for the reaction? (Remember since the NaOH dissolves in water add the
masses to get the m)
C. How many moles of NaOH are dissolved?
d. What is the AH for the reaction?

Answer:

A. Soil erosion will increase.

Option A is correct. Increase in wind speed will increase the rate of erosion.

The process of eroding, transferring, and depositing tiny particles as well as nutrients from the top layer of soil is known as soil erosion by wind.

In arid and semiarid regions, wind-driven soil erosion is a serious issue that impedes the environmental sustainability of animal husbandry and agriculture and threatens ecological security.

A wind that is blowing at 30 mph will erode at a rate that is more than 3 times faster than a wind that is blowing at 20 mph. As soil moisture rises, wind erosion declines. For instance, dry soil erodes approximately 1.3 times more quickly than soil with just enough moisture to support plant life.

Learn more about soil erosion;

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Answer:

12

Explanation:

because that plot and the iron

Answer:

A. Heat and pressure

Explanation:

Answer:

Explanation:

here to give other person brainlist

Answer:

the relation between Kp and Kc is

[tex] \colorbox{red}Kp=Kc{[RT]}^{∆n}[/tex]

where

∆n=no.of moles of gaseous product - no.of moles of gaseous reactant in the balanced chemical equation.

R=universal gas constant

T=temperature.

Answer:

100 J of energy are needed to heat the copper from 20∘C to 80∘C .

Answer:

You check whether the PH level changes when you add little amounts of strong acid or base. If you see that there is little to no change in the PH, then it is a buffer solution.

Hope that answers your question

Explanation:

Answer:

When the sun's rays strike Earth's surface near the equator, the incoming solar radiation is more direct (nearly perpendicular or closer to a 90˚ angle). Therefore, the solar radiation is concentrated over a smaller surface area, causing warmer temperatures.

Explanation:

Answer:For atoms and molecules, the width of spectral lines is governed mainly by the broadening of the energy levels of the atoms or molecules during interactions with surrounding particles and by the broadening of the spectral lines as a result of the Doppler effect.

Explanation:

Answer:

potassium cyanide

Explanation:

while eye medications do harm your immune system it is not enough to kill someone. criminals mainly used potassium cyanide because it was cheap. it serves as a substitute for ethanol.

Answer:

186.3g

Explanation:

4.5moles of K₂CO₃  is in 1000ml

? moles of K₂CO₃ is in 300 ml

(4.5 × 300)/ 1000 = 1.35 moles of K₂CO₃

1 mole of K₂CO₃ = (39 × 2) + 12 + (16 × 3) = 78 + 12 + 48 = 138g

1.35 moles of K₂CO₃  = ?

= (1.35 × 138)/1 = 186.3g

Answer: The volume of tank is 17.5 L.

Explanation:

Given: Mass of methane = 173 g

Pressure = 15.1 atm

Temperature = 298 K

Molar mass of methane is 16.04 g/mol.

Therefore, moles of methane are calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{173 g}{16.04 g/mol}\\= 10.78 mol[/tex]

Now, ideal gas equation is used to calculate the volume as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\15.1 atm \times V = 10.78 mol \times 0.0821 L atm/mol K \times 298 K\\V = \frac{10.78 mol \times 0.0821 L atm/mol K \times 298 K}{15.1 atm}\\= 17.5 L[/tex]

Thus, we can conclude that volume of the tank is 17.5 L.

Answer:5.1L

Explanation:

Answer:

b

Explanation:t not sure

Answer:

c

Explanation:

Answer:

They become a supernova

Explanation:

answer:

a supernova happens and it's quite a beautiful thing. a supernova happens when a star runs out of fuel (hydrogen) and once there isn't any fuel left the star begins to collapse and the outer layer explodes into a supernova. cool right? ( now not all stars explode into supernovas just the red giants. some other stars just fade away.)

explanation:

https://www.sciencefocus.com/space/how-do-stars-die/

good luck :)

i hope this helps

brainliest would be highly appreciated

have a nice day!

Answer:

According to the b word, this is the answer

Explanation:

Learning a periodic table is more important as it is systematically arranged to give a lot of information about the elements and the way they relate to each other in various ways. Moreover, chemistry is all more about chemical elements. Hence a good understanding of the chemical elements will discover more about chemistry.

Answer:

2.3 * 10^-5

Explanation:

Recall that the solubility of a solute is the amount of solute that dissolves in 1 dm^3 or 1000cm^3 of solution.

Hence;

Amount of calcium oxalate = 154 * 10^-3/128.097 g/mol = 1.2 * 10^-3 mols

From the question;

1.2 * 10^-3 mols dissolves in 250 mL

x moles dissolves in 1000mL

x = 1.2 * 10^-3 mols * 1000/250

x= 4.8 * 10^-3 moldm^-3

CaC2O4(s) ------->Ca^2+(aq) + C2O4^2-(aq)

Hence Ksp = [Ca^2+] [C2O4^2-]

Where;

[Ca^2+] = [C2O4^2-] = 4.8 * 10^-3 moldm^-3

Ksp = (4.8 * 10^-3)^2

Ksp = 2.3 * 10^-5

Answer:

the order of vibrational frequency is:

C ≡ N > C=N > C=S > S-C

Explanation:

The bond's vibration frequency is determined using the following equation:

[tex]\zeta = \dfrac{1}{2 \pi c}\sqrt{\dfrac{k}{\mu}}[/tex]

where;

reduced mass[tex]\mu = \dfrac{m_1m_2}{m_1+m_2}[/tex]

velcoity of light = c

force constant = k

The frequency of vibration, on the other hand, is inversely proportional to the atom's mass, because the heavier the atom, the lower the frequency.

In addition, the value of a bond's stretching frequency rises as the bond's intensity rises. As a result, the frequency is as follows:

triple > double > single

The reduced mass [tex](\mu)[/tex] of C-N bond.

[tex]\mu = \dfrac{m_1m_2}{m_1+m_2}[/tex]

[tex]\mu = \dfrac{12*14}{12+14} \\ \\ \mu = 6.46[/tex]

The reduced mass of C-S bond;

[tex]\mu = \dfrac{m_1m_2}{m_1+m_2}[/tex]

[tex]\mu = \dfrac{12\times 32}{12+32} \\ \\ \mu = 8.72[/tex]

Thus, the order of vibrational frequency is:

C ≡ N > C=N > C=S > S-C

Answer:

They have low humidity and low levels of precipitation.

Explanation:

Both the desert and the tundra are two extreames, one is really hot while the other is really cold. Deserts only receive less than 300 mm of rain each year. While the tundra receives 150 to 250 mm of precipitation each year, including melted snow. Which is less than the majority of the world's deserts.

Answer: They have low humidity and low levels of precipitation.

Explanation:

Differences: Tundra's are extremely cold, and doesn't get much rain.

Differences: The Dessert is Extremely hot and doesn't get rain.

Explanation: There is already our answer here, If we compare there differences the we will find our answer. This is what I found as the same "doesn't get rain." And we know that precipitation is rain so your answer would be precipitation. Your answer: They have low humidity and low levels of precipitation.

Answer:

[tex]296.05\ \text{K}[/tex]

Explanation:

[tex]m_w[/tex] = Mass of water = 100 g

[tex]c_w[/tex] = Specific heat of water = [tex]4.184\ \text{J/g K}[/tex]

[tex]m_c[/tex] = Mass of copper = 20 g

[tex]c_c[/tex] = Specific heat of copper = [tex]0.385\ \text{J/g K}[/tex]

[tex]\Delta T_w[/tex] = Temperature change in water = [tex](T-295)[/tex]

[tex]\Delta T_c[/tex] = Temperature change in cooper = [tex](353-T)[/tex]

T = Final temperature of the system

The heat balance of the system is given by

[tex]m_wc_w\Delta T_w=m_cc_c\Delta T_c\\\Rightarrow 100\times 4.184\times (T-295)=20\times 0.385\times (353-T)\\\Rightarrow 418400\left(T-295\right)=7700\left(353-T\right)\\\Rightarrow 418400T-123428000=2718100-7700T\\\Rightarrow T=\frac{1261461}{4261}\\\Rightarrow T=296.05\ \text{K}[/tex]

The final temperature of the water is [tex]296.05\ \text{K}[/tex].

The final temperature of the water when placed in a calorimeter is 296.05K

HOW TO CALCULATE FINAL TEMPERATURE:

Where;

Learn more at: https://brainly.com/question/10987564?referrer=searchResults

Answer:

Well 4 in H2SO4 would be called Sulfuric Acid

Explanation:

The Reason why its called by its name because the form lua is called this its because its a colorless Acid that burns it also has dissolving metals and other stuff inside of it. it has another name called oil of vitriol. hopefully this helps ^^!

Answer:

No, no precipitate is formed.

Explanation:

Hello there!

In this case, since the reaction between silver nitrate and sodium acetate is:

[tex]AgNO_3(aq)+NaC_2H_3O_2(aq)\rightarrow AgC_2H_3O_2(s)+NaNO_3(aq)[/tex]

In such a way, we can calculate the concentration of silver and acetate ions in the solution as shown below, and considering that the final total volume is 50.00 mL or 0.0500 L:

[tex][Ag^+]=\frac{20.00mL*0.077M}{50.00mL}=0.0308M[/tex]

[tex][C_2H_3O_2^-]=\frac{30.00mL*0.043M}{50.00mL}=0.0258M[/tex]

In such a way, we can calculate the precipitation quotient by:

[tex]Q=[Ag^+][C_2H_3O_2^-]=0.0308*0.0258=7.95x10^{-4}[/tex]

Which is smaller than Ksp and meaning that the precipitation does not occur.

Regards!

Answer:

0.628 M.

Explanation:

In order to solve this problem we need to keep in mind the definition of molarity:

We are given both the number of moles and the volume of solution, meaning we can now proceed to calculate the molarity:

Answer:

Choose three different light levels, and place four identical plants under each light level to observe the light’s effect on multiple plants.

Explanation:

Answer:

Advantage: Very low fuel costs.

Advantage: Produces no polluting gases.

Disadvantage: Large-scale accidents can be catastrophic.

Disadvantage: Public perception of nuclear power is negative.

Explanation:

Learn more about nuclear energy here:

https://brainly.com/question/15186766

#SPJ2

Explanation:

Consider matrix A.

What is the inverse of A? Fill in the missing elements in the matrixs.Consider matrix A.

What is the inverse of A? Fill in the missing elements in the matrixs.

(2) 2.

Explanation:

2Al + 3CuSO4 → Al2(SO4)3 + 3Cu

Hence, now yet it's balanced chemical equation.

Answer: New volume of the solution is 100 mL.

Explanation:

Given: [tex]V_{1}[/tex] = 3 mL,     [tex]M_{1}[/tex] = 200 M

[tex]M_{2}[/tex] = 6 M,     [tex]V_2[/tex] = ?

Formula used to calculate the new volume of solution is as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]

Substitute the values into above formula as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}\\200 M \times 3 mL = 6 M \times V_{2}\\V_{2} = \frac{200 M \times 3 mL}{6 M}\\= 100 mL[/tex]

Thus, we can conclude that new volume of the solution is 100 mL.