In an endothermic reaction, the energy of
the surroundings is
than the energy of
the system

Answer:

11

Explanation:

3 + 8 = 11

20 character minimum, here you go.

Answer:

1.    6.116x1024 Molecules of H2O

2.    13400 L

3.    8.001x1024 Molecules of Mg3(PO4)2

4.    572 g.

5.    1.017x1025 Molecules of N2

6.    7.24 g

.7.     6980 g. of Al(OH)3

8.    3H2 + N2    => 2NH3

9.    S8 + 8O2   => 8SO2

10.  Ni(ClO3)2→     NiCl2   +  3O2

11.  C2H4      +      3O2→      2CO2      +     2H2O

12.  2KClO3→      2KCl      +      3O2

13.  Cu(OH)2   +   2HC2H3O2→     Cu(C2H3O2)2      +     2H2O

14.  C3H8      +      5O2→      3CO2      +      4H2O

15.  191 g of CO

Answer:

C. they both eat and grow a lot, i hope it helps

Answer:Its claim 2

Explanation:claim 1 says All of the atoms are destroyed but atoms cant be destroyed.Claim 3 might seem correct but is not.

Answer:

31.25

Explanation:

The half life is 5.3 years

This means that 1.2 of the orginal matter is left after every 5.3 years.

To find this, divide 26.5(total years) by 5.3(hald life)

This gets you 5.

This is how many times half life occurs, or how many times the total mass is split in half.

This can be though of 1/2^5th power

Or

1/32

Now, lets mutliply this by the 1000 total mass:

1000*1/32

=

31.25g

This is your answer!

Hope this helps!

Answer:

Pressure of dry gas = 722.6 mmHg

Explanation:

From the question given above, the following data were obtained:

Measured pressure = 745 mmHg

Water vapor pressure at 24.0 °C = 22.4 mmHg

Pressure of dry gas =?

The pressure of dry gas can be obtained as follow:

Measured pressure = pressure on dry gas + water vapor pressure

745 = pressure of dry gas + 22.4

Collect like terms

Pressure of dry gas = 745 – 22.4

Pressure of dry gas = 722.6 mmHg

Answer:

0.8 mL

Explanation:

Use the formula M1V1 = M2V2.

Plug the values in.

5(V1) = 0.02(200)

5V1 = 4

V1 = 0.8 mL

Hope this is right, correct me if I'm wrong!

The 3.13 g of K would be needed to completely react with the remaining [tex]Cl_2[/tex].

To determine which reactant is limiting, we need to calculate the amount of product that can be formed from each reactant and compare them. The reactant that produces less product is the limiting reactant, since the reaction cannot proceed further once it is consumed.

The balanced chemical equation for the reaction between solid potassium and chlorine gas is:

2 K(s) + [tex]Cl_2[/tex](g) -> 2 KCl(s)

From the equation, we can see that 2 moles of K react with 1 mole of [tex]Cl_2[/tex] to form 2 moles of KCl.

First, we need to convert the masses of K and [tex]Cl_2[/tex] into moles:

moles of K = 15.20 g / 39.10 g/mol = 0.388 mol

moles of [tex]Cl_2[/tex] = 2.830 g / 70.90 g/mol = 0.040 mol

Now, we can use the mole ratio from the balanced equation to calculate the theoretical yield of KCl from each reactant:

Theoretical yield of KCl from K: 0.388 mol K x (2 mol KCl / 2 mol K) = 0.388 mol KCl

Theoretical yield of KCl from [tex]Cl_2[/tex]: 0.040 mol [tex]Cl_2[/tex] x (2 mol KCl / 1 mol [tex]Cl_2[/tex]) = 0.080 mol KCl

We can see that the theoretical yield of KCl from K is 0.388 mol, while the theoretical yield of KCl from [tex]Cl_2[/tex] is 0.080 mol. Therefore, the limiting reactant is [tex]Cl_2[/tex], since it produces less product.

To determine how much more of the limiting reactant would be needed to completely consume the excess reactant, we can use the stoichiometry of the balanced equation.

We know that 1 mole of [tex]Cl_2[/tex] reacts with 2 moles of K to produce 2 moles of KCl. Therefore, the amount of additional K needed to react with the remaining [tex]Cl_2[/tex] can be calculated as follows:

moles of K needed = 0.040 mol [tex]Cl_2[/tex] x (2 mol K / 1 mol [tex]Cl_2[/tex])

                                = 0.080 mol K

This means that 0.080 moles of K would be needed to completely consume the remaining [tex]Cl_2[/tex]. We can convert this to a mass by multiplying by the molar mass of K:

mass of K needed = 0.080 mol K x 39.10 g/mol

                              = 3.13 g K

Therefore, The 3.13 g of K would be needed to completely react with the remaining.

Example verification:

Suppose we had an additional 0.50 g of [tex]Cl_2[/tex] in the reaction. Would all of the K be consumed, or would there still be excess K?

Moles of additional [tex]Cl_2[/tex] = mass of [tex]Cl_2[/tex] / molar mass of [tex]Cl_2[/tex]

Moles of additional [tex]Cl_2[/tex] = 0.50 g / 70.90 g/mol

Moles of additional [tex]Cl_2[/tex] = 0.0070 mol

The theoretical yield of KCl that can be formed from the additional [tex]Cl_2[/tex] is:

0.0070 mol [tex]Cl_2[/tex] x (2 mol KCl / 1 mol [tex]Cl_2[/tex]) x (74.55 g KCl / 1 mol KCl) = 1.04 g KCl

Therefore, the total amount of KCl that can be formed from all of the [tex]Cl_2[/tex] is:

5.95 g + 1.04 g = 6.99 g

The amount of K that would be needed to completely consume all of the [tex]Cl_2[/tex].

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Answer: 6.01

Explanation:

Answer:

In my Opinion

Explanation:

False. There's no pulley system or activity in a knife.

Answer:

A. Alkene

Explanation:

Alkenes are a class of hydrocarbons characterized by the possession of a carbon to carbon double bond (=) in their structure. This means that C=C is the functional group of alkenes. Alkenes have the general formula; CnH2n.

Based on the structure in the attached image, the structure can be identified to be an ALKENE because it possess a C=C functional group. Specifically, the IUPAC name of the structure is 1,2- dimethyl ethene.

Answer:

The activated complex

Explanation:

The activated complex are the species that exists maximum in every energy profile of a reaction.

Activated complex is nothing but an intermediate state of reactants formed during its conversion from a reactant to product state in coarse of reaction.

The activated complex is formed at the maximum energy level in the reaction path. And this difference between energy of the activated complex and the energy of the reactants is only known as activation energy

Answer: The brightness of light is related to intensity or the amount of light an object emits or reflects. Brightness depends on light wave amplitude, the height of light waves. Brightness is also somewhat influenced by wavelength.

Explanation:

Answer:

[tex]Ksp=[Ni^{2+}][CN^-]^2\\\\Ksp=[Ag^+][OH^-][/tex]

Explanation:

Hello there!.

In this case, for this equilibrium problem, it turns out firstly necessary to write the chemical equations for the solubilization of both nickel (II) cyanide and silver hydroxide as shown below:

[tex]Ni(CN)_2(s)\rightarrow Ni^{2+}(aq)+2CN^-\\\\AgOH(s)\rightarrow Ag^+(aq)+OH^-[/tex]

Thus, by means of the law of mass action we set up these equilibrium expressions as shown below:

[tex]Ksp=[Ni^{2+}][CN^-]^2\\\\Ksp=[Ag^+][OH^-][/tex]

Best regards!

Answer:

[tex]V_2=8.4L[/tex]

Explanation:

Hello there!

In this case, according to the definition of the Boyle's law, which describes de pressure-volume behavior as an inversely proportional relationship, it is possible for us to write:

[tex]P_1V_1=P_2V_2[/tex]

Thus, since we are given the initial pressure and temperature, and the final pressure, we are able to calculate the final volume as shown below:

[tex]baV_2=\frac{P_1V_1}{P_2}\\\\V_2=\frac{8.0L*1.013bar}{ 0.968bar}\\\\V_2=8.4L[/tex]

Regards!

Answer:

Attached below

Explanation:

Attached below is the required diagrams

From the attached diagram ; Compounds 1 and 2 are achiral ( i.e. stereoisomers aren't possible here )

Compound 3 : ( 1S, 2R ) - 1 - chloro-2-methylcyclopropane

Compound 4: ( 1R , 2S ) - 1- chloro-2-methylcyclopropane

Compound 5: ( 1R, 2R ) - 1 - chloro-2-methylcyclopropane

Compound 6: ( 1S, 2S ) -1- chloro-2- methyl cyclopropane

Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.

The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

Geocentric model is any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.

This model is  often named Ptolemaic model after its most famous supporter, the Greco-Roman astronomer Ptolemy.

The geocentric is often referred to as the Medieval view of the universe and it dominated thinking into the early modern age.

Therefore, The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.

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Answer: 5) combustion is the answer.

Explanation: Combustion is reaction with oxygen.

Answer:

the correct answer is option A

Answer:

13%

Explanation:

Answer:

Ethanol

Explanation:

Answer:

Alcohol remains liquid at lower temperatures, but also vaporizes at lower temperatures (compared to water), so it is suitable for thermometers that operate over a lower temperature range, such as outdoor thermometers.

Explanation:

Hope it helps to you :) <3<3

Answer:

The final volume will be "70.08 mL".

Explanation:

The given values are:

Molar mass,

M1 = 548 nM

or,

     = [tex]5.48\times 10^{-7} \ M[/tex]

M2 = 484 nM

or,

      = [tex]4.84\times 10^{-7} \ M[/tex]  

Volume,

V1 = 61.9 mL

V1 = ?

By using the expression, we get

⇒ [tex]M1\times V1=M2\times V2[/tex]

or,

⇒            [tex]V2=\frac{M1\times V1}{M2}[/tex]

By substituting the values, we get

                    [tex]=\frac{5.48\times 10^{-7}\times 61.9}{4.84\times 10^{-7}}[/tex]

                    [tex]=\frac{339.212}{4.84}[/tex]

                    [tex]=70.08 \ mL[/tex]

Answer:

it's very easy and simple answer u can't do it

Answer:chemical formula of acetic acid is  or

so, molecular mass of acetic acid = 2 × atomic mass of C + 4 × atomic mass of H + 2 × atomic mass of O

= 2 × 12 + 4 × 1 + 2 × 16

= 24 + 4 + 32

= 60g/mol

given mass of acetic acid = 22g

so, no of moles of acetic acid = given mass/molecular mass

= 22/60 ≈ 0.367

so, number of moles of acetic acid is 0.367mol

number of molecules in 0.367 mol of acetic acid = 6.022 × 10²³ × 0.367

= 2.21 × 10²³

Explanation:

Answer:

dryhnjkftglqawghbnjsdfmkpohbgfddfvgb

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 0.4 \ mol \ HCl}}[/tex]

Explanation:

Molarity is concentration measured in moles per liters. It is the number of moles of solute per liters of solution. The formula is:

[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}}[/tex]

We know the solution of HCl has a molarity of 0.5 molar and there are 0.8 liters of solution.

The moles of solute or HCl are unknown, so we can use x. Now, we can substitute all known values into the formula.

[tex]0.5 \ mol \ HCl /L = \frac {x}{0.8 \ L}[/tex]

Since we are solving for the moles of solute (x), we must isolate the variable. It is being divided by 0.8 liters. The inverse of division is multiplication, so we multiply both sides by 0.8 L.

[tex]0.8 \ L *0.5 \ mol \ HCl /L = \frac {x}{0.8 \ L} *0.8 \ L[/tex]

[tex]0.8 \ L *0.5 \ mol \ HCl /L=x[/tex]

The units of liters (L) cancel.

[tex]0.8 * 0.5 \ mol \ HCl= x[/tex]

[tex]0.4 \ mol \ HCl=x[/tex]

This solution contains 0.4 moles of HCl.

Answer:

112.9-kJ

Explanation:

Example;

To find the energy, you should follow the following rule :

Q= mass * latent heat of vaporization

Q= m * l

Q= 50g * 2260 J/g

Q= 113000 J

Answer;

The heat of vaporization of water is 2257-J/g - each grams must release 2257-J of thermal energy. When water condenses its temperature remains constant.  

Q = m x Hv ===> 50-g x 2257-J/g = 112,850-J = 112.9-kJ