Calculate AH for the following reaction.
C2H4(g) + H2(g) → C2H6(g)
(ΔHf° for C2H4(g) = 52.5 kJ/mol; ΔHf° for C2H6(g) = -84.7 kJ/mol)
a. -137.2 kJ
b. -32.2 kJ
c. 32.2 kJ
d. 137.2 kJ

Answer:

It is caused by currents of electricity that flow in the molten core.

Answer:

true

Explanation:

ever heard of "plant perspiration"?

Answer:

2.1648562314118083

Explanation:

1 mole = 74.09268.

We assume you are converting between grams Calcium Hydroxide and mole.

Plus you will need to round up the number for answer

Answer:

The average speed is 553.27[tex]\frac{km}{hour}[/tex]

Explanation:

Speed is the physical magnitude that shows and expresses the variation in position of an object and as a function of time. In other words, the speed relates the distance traveled by an object in the unit of time.

The average speed is the quotient of the space traveled by an object and the time it takes to cover the path:

[tex]speed=\frac{distance}{time}[/tex]

In this case:

So, replacing in the definition of speed:

[tex]speed=\frac{3,043 km}{5.5 hours}[/tex]

Solving:

speed= 553.27[tex]\frac{km}{hour}[/tex]

The average speed is 553.27[tex]\frac{km}{hour}[/tex]

Answer:

it's a double displacement reaction

Explanation:

The percentage of fluorine in the given compound is 49%.

The given compound;

CaF₂

The molecular mass of the given compound is calculated as follows;

CaF₂ = (40) + (19 x 2)

        =   40  +  38  

        =  78 g/mol

The mass of fluorine in the given compound = 38 g/mol

The percentage of fluorine in the given compound is calculated as follows;

[tex]= \frac{38}{78} \times 100\%\\\\= 48.7 \%\\\\\approx 49\%[/tex]

Thus, the percentage of fluorine in the given compound is 49%.

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Answer:

Positive acceleration involves speeding up, while negative acceleration involves slowing down.

Explanation:

I am so sorry if I was wrong!

Answer:

no just no

Explanation:

Answer:

Kidneys •_•

Hope this helped <3

Answer:

a. more mosquitos more malaria

b. DDT worked to keep malaria numbers down by killing mosquitos

c. silent spring's great PR campaign got it banned and with the help of the EPA it was banned almost worldwide and if it was not banned manufacturing it stopped

d. it will continue to increase and 100s of millions of dead will be stacked even higher from malaria

Explanation: it is a tragedy, not sure if that is what you were given to read but that is the side that is rarely told

the birds all dying was not correct, it is not a cartcinogen, it doesn't poison the ocean

here is an interesting quote that is rather telling about how some with power make their decisions

My own doubts came when DDT was introduced for civilian use. In Guyana, within two years it had almost eliminated malaria, but at the same time the birth rate had doubled. So my chief quarrel with DDT in hindsight is that it has greatly added to the population problem.

– Alexander King, cofounder of the Club of Rome, 1990

Absolutely horrific, he is saying that the problem with DDT is that it saved lives

Answer:

Chromosomes threads of DNA that make up a twisty, coiled shape. DNA strands carry genes, and traits are influenced by the genes that people get from their biological parents.

Explanation:

I got this from goggle ...

Answer:

7

Explanation:

Answer:

gvapor or gas to liquid

Explanation:

water which collects as droplets on cold surface when humid air is in contact with it

Answer:

Explained below.

Explanation:

- Redox reaction is defined as any type of chemical reaction whereby the oxidation number of a participating chemical atoms/elements undergo changes.

- The atom that is oxidized is the one that has an increase in it's oxidation number.

- The atom that is reduced is the one that has a decrease in its oxidation number.

- The reducing agent is defined as the atom that is oxidized.

- The oxidizing agent is defined as the atom that is reduced.

Answer:

Explanation:

From your question you’ll have to assumethat the temperature is constant,since you do not have an initial temperature.

If thats the case thrn you can use;

P1V1=P2V2 to calculate the second volume.

P1=1200 torr

P2=760 torr

V1 = 20.4L

The volume occupied by 20.4 liters of Carbon dioxide (CO₂) at 1200 Torr when it is at Standard temperature pressure is 32.21 L.

Volume of gas can be calculated by arranging the ideal gas equation as:

P₁V₁ = P₂V₂, where

P₁ = given pressure = 1200 Torr

V₁ = given volume = 20.4 L

P₂ = standard pressure = 760 Torr

V₂ = to find?
Here, we consider the moles and temperature of gas is constant, on putting all these value on the above equation we get:

V₂ = (1200 × 20.4) / 760 = 32.21 L

Hence, 32.21 L is the required volume.

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Answer: C.  It is reduced.

Explanation:

Answer:

C

Explanation:

Because it is reduced.

Answer:

butane

Explanation:

Answer:

its C

Explanation:

Wind turbines work on a simple principle: instead of using electricity to make wind—like a fan—wind turbines use wind to make electricity. Wind turns the propeller-like blades of a turbine around a rotor, which spins a generator, which creates electricity.

Answer: I wanna say B

Explanation:

It makes the most scenes out of all of those answers let me know if im right:)

Answer:

it is c

Explanation:

the number of electrons in the outermost shell of an atom determines its reactivity

Answer:

A

Explanation:

An unbalanced force is your answer.

Answer:

I would say C and D

Explanation:

Hope this helps my good friend :)

According to the forces of attraction, the phase changes that occur at the same temperature are vaporization and condensation, melting and vaporization ​.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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#SPJ6

Answer:

falseeee a female has two X's and the male has XY

Explanation:

learned this in biology last year

Answer: sand, silt, and clay.

Answer:

97.9

Explanation:

m= n*M

M CaCl2= 40+ 35.5*2= 110

m= 0.89*110= 97.9

The mass of the given mole of [tex]CaCl_2[/tex] is required.

The mass of the given compound is 98.78 g.

Molar mass of [tex]CaCl_2[/tex]

[tex]M=40.078+35.453\times 2=110.984\ \text{g/mol}[/tex]

n = Number of moles = 0.89 mol

Mass is given by

[tex]m=Mn\\\Rightarrow m=110.984\times 0.89\\\Rightarrow m=98.78\ \text{g}[/tex]

The mass of the given compound is 98.78 g.

Learn more:

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Answer:

Rubber

Explanation:

Answer:

copper

Explanation:

Answer: The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic, in which

Explanation:

Answer:

The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic.

Answer:

316.08g

How many moles Al2O3 in 1 grams? The answer is 0.0098076450122103. We assume you are converting between moles Al2O3 and gram. You can view more details on each measurement unit: molecular weight of Al2O3 or grams This compound is also known as Aluminium Oxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Al2O3, or 101.961276 grams. Note that rounding errors may occur, so always check the results.

Answer:

False

Explanation:

Humans and plans do it as well

Answer:

False

Explanation:

Cellular respiration takes place in the cells of all organisms. It occurs in autotrophs such as plants as well as heterotrophs such as animals.