which element was used by the ancient egyptians, in the form of borax, to make mummies?​

Answer:

-2070 kJ

Explanation:

Answer:

reaction between oxygen and hydrocarbon is combustion

The compound would most likely be the reactants in a combustion reaction is oxygen and hydrocarbon.

Those reaction in which a fuel will change into a water molecule and carbon dioxide gas, in the presence of oxygen is known as combustion reaction.

Combustion reaction will represent as:

CₓHₙ + O₂ → H₂O + CO₂, where

CₓHₙ is a hydrocarbon which gets oxidized in the presence of oxygen oxidant.

Hence option (2) is correct i.e. oxygen and hydrocarbon.

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Answer:

The is 4. Like with many things about our planet it is caused by Humans and Nature, I belive because droughts can be caused by humans and nature.

Explanation: Humans cut trees down trees , which trigger droughts to happen. Also because when humans cut a widespread of trees down just for fuel, it can potentially reduce the soil's ability to hold water ... triggering droughts to happen. But also droughts can happen just by nature.

The reaction in the chemical cell has been best classified as the redox reaction. Thus, option B is correct.

The reaction cell or the voltaic cell has been the one that has been able to convert electrical energy into chemical energy. In the chemical cell, electrical energy has been provided to the cell for bringing the chemical change.

The chemical change has been brought by the oxidation and reduction of the elements with the application of electric current. The reaction that has been based on the oxidation and reduction of the elements has been termed the redox reaction.

Thus, the reaction in the chemical cell has been best classified as the redox reaction. Thus, option B is correct.

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Answer: A

Explanation: i took the test

Answer:

Balanced equations and mole ratios

In general, mole ratios can be used to convert between amounts of any two substances involved in a chemical reaction.

Explanation:

yw

Answer:

ask your mom and your family

Explanation:

tell your mom that she sucks

Answer:

yqujsbr

Explanation:

hejsudh2ihdg4 they t sjh5c4uSvreju5 aur bd84kskythddok6vr for

Answer:

The great age of continental rocks results from their inability to be subducted. ... We also know that the increase in age of ocean crust away from ocean basins results from creation of new sea floor at the MORs, with destruction of older sea floor at ocean trenches, which are often located near continental margins.

Explanation:

The age of the ocean crust used as evidence for plate tectonics because older ocean crust is being melted back into the mantle at divergent boundaries.Older ocean crust is being melted back into the mantle at divergent boundaries. Therefore, option A is correct.

Plate tectonics is a theory because it supplies an explanation of why and how segments of the earth displace and make earthquakes and mountains and volcanos.

This states why ocean floor rocks are generally less than 200 million years old whereas the oldest continental rocks are more than 4 billion years old.

The great age of continental rocks effects from their inability to be subducted. We also know that the addition in age of ocean crust away from ocean basins results from activity of new sea floor at the MORs, with destruction of older sea floor at ocean trenches.

Thus, option A is correct.

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Your question is incomplete, most probably your question was

Why is the age of the ocean crust used as evidence for plate tectonics?

A Older ocean crust is being melted back into the mantle at divergent boundaries.Older ocean crust is being melted back into the mantle at divergent boundaries.

B There are striations on the ocean crust where the continental crust moved over the top of it.There are striations on the ocean crust where the continental crust moved over the , top of it.

C Ocean crust is older than continental crust so it shows that the continents are younger.Ocean crust is older than continental crust so it shows that the continents are , younger.

D New ocean crust is being formed at underwater divergent boundaries pushing away older crust.

Answer:

False

Explanation:

Not all of it but some of it. Hope this helps! (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

Answer:

Fossils are traces of organisms that lived in the past. When fossils are found, they are analyzed to determine the age of the fossil. The absolute age of the fossil can be determined through radiometric dating and determining the layer of rock in which the fossil was found.

Explanation:

Answer:

I will go for a heterogeneous mixture

Explanation:

alloy is basically a mixture

Answer:

option d is right

Explanation:

More precipitation occurs near the equator because it is a tropical area. Mountains receive less than 15 inches of rain per year while the equator area receives a lot of rain. This is due to the very hot weather.

The climate around the equator will have more precipitation because it is very hot.

thats the answer

2 Ca + 2H2O ⇒ 2 Ca(OH)2 + H2

Explanation: number of atoms of every element

Need to be equal in both sides

The right ratio of chemicals for the balanced chemical equation is  2Ca + 2H₂O ⇒ 2 Ca( OH )₂ + H₂.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

Because mass cannot be generated or destroyed, according to the rule of conservation of mass, a chemical equation must always be in balance.

A chemical equation must be balanced. This is so that it can convey how many moles are reacting and creating. The amount of electrons that are transferred from one substance to another is also indicated. An equation that balances or is balanced also describes how energy is changed.

Thus, the balanced chemical equation is  2Ca + 2H₂O ⇒ 2 Ca( OH )₂ + H₂.

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Answer:

277.0g of CO₂ is theoretical yield

Explanation:

In the reaction, 2 moles of C₄H₁₀ react with 8 moles of CO₂.

To solve this question, we must convert the volume of the C₄H₁₀to moles. Then, using the chemical reaction, find the moles of CO₂ produced and its mass as follows:

PV = nRT

Assuming STP conditions:

P = 1atm

V = 35.5L

n are moles

R = 0.082atmL/molK

T = 273.15K

Replacing:

n = PV/RT

n = 1atm*35.25L / 0.082atmL/molK*273.15K

n = 1.574 moles C₄H₁₀

Assuming all these moles are converted in CO₂ (theoretical yield), the moles of carbon dioxide are:

1.574 moles C₄H₁₀ * (8mol CO₂ / 2mol C₄H₁₀) = 6.295 moles CO₂

And the theoretical yield in mass is:

6.295 moles CO₂ * (44.01g / mol) =

Explanation:

CH4, methane is a non polar compound whereas CH3Cl is a polar compound because of presence of electronegative element chlorine. Hence, there is a net dipole moment in case of CH3Cl( Chloromethane). This causes CH3Cl to exhibits dipole-dipole intermolecular force of attraction, which is absent in CH4. Therefore, Chloromethane has a lower vapor pressure when compared to methane.  

The given question is incomplete. The complete question is:

A brick has a mass of 4.0 kg and the earth has a mass of [tex]6.0\times 10^{27}g[/tex] Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of bricks? Round your answer to 2 significant digits. How many moles of bricks have a mass equal to the mass of the Earth? Round your answer to 2 significant digits.

Answer: The mass of 1 mole of bricks is [tex]2.4\times 10^{27}g[/tex]

2.5 moles of bricks have a mass equal to the mass of the Earth

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

Mass of 1 brick = 4.0 kg = 4000 g     (1kg=1000g)

Thus mass of 1 mole of brick or [tex]6.023\times 10^{23}[/tex] bricks will be = [tex]\frac{4000g}{1}\times 6.023\times 10^{23}=2.4\times 10^{27}g[/tex]

The mass of 1 mole of bricks is [tex]2.4\times 10^{27}g[/tex]

Now [tex]2.4\times 10^{27}g[/tex] will correspond to = 1 mole of bricks

[tex]6.0\times 10^{27}g[/tex] will correspond to =[tex]\frac{1}{2.4\times 10^{27}}\times 6.0\times 10^{27}=2.5moles[/tex]

2.5 moles of bricks have a mass equal to the mass of the Earth

Answer:

True

Explanation:

Answer:

barium sulfate

Explanation:

Answer:

[tex]M=0.0513M[/tex]

Explanation:

Hello!

In this case, since the molarity of a solution is computed by dividing the moles of solute by the volume of solution, we notice we first need the moles of KHP as shown below:

[tex]n=0.5237g*\frac{1mol}{204.22 g} =0.00256mol[/tex]

Next, the volume in liters:

[tex]V=50.0mL*\frac{1L}{1000mL}\\\\V=0.0500L[/tex]

Thus, the molarity turns out to be:

[tex]M=\frac{n}{V}\\\\M=\frac{0.00256mol}{0.05000L} \\\\M=0.0513M[/tex]

Best regards!

Answer:

B I think I am pretty sure

Answer:

air presure pushes things and the wind is a gust of air

Explanation:

In H4SiO4, the mole ratio of carbon to hydrogen to oxygen is the same as described in the question. Therefore H4SiO4 is the empirical formula

I hope this helps you!!

Explanation:

total atoms = 18 + 6 + 24= 48 atoms

Answer:

720 divided by 2 answer is 556 so answer per is 3.32.3

Explanation:

Answer:

The volume of  5.0 g CO  2  is  2.6 L CO  2  at STP

Explanation:

STP

STP is currently  

0

∘

C

or  

273.15 K

, which are equal, though the Kelvin temperature scale is used for gas laws; and pressure is  

10

5

.

Pascals (Pa)

, but most people use  

100 kPa

, which is equal to  

10

5

.

Pa

.

You will use the ideal gas law to answer this question. Its formula is:

P

V

=

n

R

T

,

where  

P

is pressure,  

V

is volume,  

n

is moles,  

R

is a gas constant, and  

T

is temperature in Kelvins.

Determine moles

You may have noticed that the equation requires moles  

(

n

)

, but you have been given the mass of  

CO

2

. To determine moles, you multiply the given mass by the inverse of the molar mass of  

CO

2

, which is  

44.009 g/mol

.

5.0

g CO

2

×

1

mol CO

2

44.009

g CO

2

=

0.1136 mol CO

2

Organize your data

.

Given/Known

P

=

100 kPa

n

=

0.1136 mol

R

=

8.3145 L kPa K

−

1

mol

−

1

https://en.wikipedia.org/wiki/Gas_constant

T

=

273.15 K

Unknown:  

V

Solve for volume using the ideal gas law.

Rearrange the formula to isolate  

V

. Insert your data into the equation and solve.

V

=

n

R

T

P

V

=

0.1136

mol

×

8.3145

.

L

kPa

K

−

1

mol

−

1

×

273.15

K

100

kPa

=

2.6 L CO

2

rounded to two significant figures due to  

5.0 g

Answer link

Doc048

May 18, 2017

I got 2.55 Liters

Explanation:

1 mole of any gas at STP = 22.4 Liters

5

g

C

O

2

(

g

)

=

5

g

44

(

g

mole

)

=

0.114

mole

C

O

2

(

g

)

Volume of 0.114 mole  

C

O

2

(

g

)

= (0.114 mole)(22.4 L/mole) = 2.55 Liters  

C

O

2

(g) at STP

that temperature is saturated.

Answer:

C. Aqueous Solutions

General Formulas and Concepts:

Aqueous Solutions'

Explanation:

Water is the universal solution that solvents are dissolved in. Whenever anything is dissolved in water, it will be an aqueous solution.

Strong ionic solutions dissolve into their ions when dissolved in water.

Weak acids and bases don't fully dissociate in water.