BROOO PLEASE HELP ME ​

The energy diagram shows the changes in energy during a chemical reaction.

Which statement best describes the total energy change of the system?

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Reaction progress

• A. The products have higher potential energy, and energy is

absorbed.

B. The reactants have higher potential energy, and energy is

B. The reactants have higher potential energy, and energy isabsorbed.

C. The products have higher potential energy, and energy is released.

D. The reactants have higher potential energy, and energy is released.

Liquids have fixed volume but no fixed shape. ...

Liquids flow from higher to lower level.

Liquids have their boiling points above room temperature, under normal conditions.

Answer:

ddddddddddddedewxdedww

Explanation:

ddddddddddddddddddddddd

Answer:

True

Explanation:

it does! because of the angle between Saturn and Earth and the Sun.

Hope this helps plz hit the crown :D

Answer:

8.8g of CO₂ could be produced

Explanation:

The reaction of combustion of butane, C₄H₁₀, is:

C₄H₁₀ + 13/2O₂ → 4CO₂ + 5H₂O

We need to find moles of butane and oxygen to obtain the limiting reactant. With moles of limiting reactant and the chemical equation we can determine moles of CO₂ and maximum mass that could be produced:

Moles butane -Molar mass: 58.12g/mol-

2.9g * (1mol / 58.12g) = 0.050 moles butane

Moles Oxygen -Molar mass: 32g/mol-

18.5g * (1mol / 32g) = 0.578 moles oxygen

For a complete reaction of 0.050moles of butane are needed:

0.050moles of butane * (13/2mol O₂ / 1mol butane) = 0.325 moles of oxygen

As there are 0.578 moles, the limiting reactant is butane and moles of carbon dioxide produced are:

0.050moles of butane * (4mol CO₂ / 1mol butane) = 0.20 moles of CO₂

The maximum mass that could be produced is - Molar mass: 44g/mol-:

0.20 moles of CO₂ * (44g/mol) =

Answer:

The heat energy required to boil 94.15 g of ethanol is 77.7679 kJ.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three.

If the relationship between the magnitudes is direct, the following formula must be followed:

a ⇒ b

c ⇒ x

Then: [tex]x=\frac{c*b}{a}[/tex]

It is called "heat of vaporization" to the energy necessary to change 1 gram of substance in solid state, to liquid state, without changing its temperature. In this case, the heat of vaporization of ethanol is 0.826 kJ / g, that is, 0.826 kJ of energy is required to change 1 gram of substance from solid state to liquid state. The thermal energy required to boil 94.15 g of ethanol can be calculated using the following rule of three: if 0.826 kJ is required to change 1 gram of ethanol, to change 94.15 grams, how much energy does it require?

[tex]energy=\frac{94.15 grams*0.826 kJ}{1 grams}[/tex]

energy= 77.7679 kJ

The heat energy required to boil 94.15 g of ethanol is 77.7679 kJ.

The heat energy in joules required to boil the ethanol is 77.77 kJ.

The given parameters;

The heat energy in joules required to boil the ethanol is calculated as follows;

[tex]Q = m\times \Delta H_{vap}[/tex]

Q = 94.15  x  0.826

Q = 77.77 kJ

Thus, the heat energy in joules required to boil the ethanol is 77.77 kJ.

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Answer:

True

Explanation:

Nouns are words we use to name everything that surrounds us, for example, people, animals, places, things, etc.

Concrete nouns are nouns we use to name things we can detect by our senses (sight, hearing, taste, smell, and touch). The given sentence contains two concrete nouns - friend and speech.

Abstract nouns are nouns we use to name things that are not concrete, things we can't detect by our senses, for example, qualities, feelings, concepts, ideas, etc. The given sentence contains one abstract noun - democracy.

12 grams of carbon are still present, and 4 grams of hydrogen.

The mass of 6.022 10 23 atoms, molecules, or formula units makes up one mole of a substance, which is known as the molar mass. This value is given in grams per mole. The primary distinction between the two is the fact that molar mass provides the mass of a mole of a certain material. In contrast, molecular weight refers to a substance's molecule's mass.

A mole of CH4 weighs 16 grams.

32 grams is divided by 32 to get 2 moles.

1 mole of CH4 molecules have been eliminated, leaving just 1 mole behind (1 mole = 6.022 1023 gone).

Therefore, 12 grams of carbon are still present, and 4 grams of hydrogen.

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Answer:

D. 2 NO3(aq)+Ca2+

Explanation:

Reaction of calcium nitrate and potassium phosphate produce calcium phosphate and potassium nitrate. The net ionic equation for this is written as : [tex]3 Ca^{2+} (aq) +2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s)[/tex]. Thus option C is correct.

What is double displacement reaction?

In a double displacement reaction, two species or groups in reactant side are displaced in the products.

In a balanced chemical equation, all the reactants have to be in proper stochiometric ratio and the states of all species are mentioned in brackets.

In an ionic equation all the ions and charges are balanced both side and the number of each elements on both side too. The net ionic equation represents the formation of a solid product from its ions.

The balanced molecular equation and complete ionic equation are written for the given  reaction below:

[tex]3 Ca (NO_{3})_{2} (aq)+ 2K_{3} PO_{4} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s) + 6 KNO_{3}(aq)[/tex]

[tex]3 Ca^{2+} (aq) +6 NO_{3}^{-} + (aq)+ 6K^{+} + (aq) 2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s) + 6 NO_{3}^{-} (aq)+ 6K^{+} (aq)[/tex]

Now when the same species on both side is cancelled, then the net ionic equation is written as:

[tex]3 Ca^{2+} (aq) +2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s)[/tex]

Therefore, the correct et ionic equation is option c.

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Answer:

Thermal energy

Explanation:

When gasoline, coal, batteries and logs are all burn they transform chemical energy to thermal energy.

The chemical energy is the energy held between chemical chains and bonds within an atom.

Answer: dresser table

Explanation:

table can that to

Answer:

90.4 mL

Explanation:

Step 1: Given data

Step 2: Calculate the final volume of the gas

According to Boyle's law, the volume of a gas is inversely proportional to the pressure. We can calculate the final volume of the gas using the following expression.

P₁ × V₁ = P₂ × V₂

V₂ = P₁ × V₁ / P₂

V₂ = 721 mmHg × 113 mL / 901 mmHg

V₂ = 90.4 mL

Answer:

Silver Ag will be the limiting reagent.

Explanation:

The balanced reaction is:

2 Ag(s) + H₂S(g) ⇒ Ag₂S(s) + H₂(g)

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate in the reaction:

Being:

the molar mass of the compounds participating in the reaction is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate:

If you have 175g of H₂S, you can apply the following rule of three: if by stoichiomatry 34 grams of H₂S react with 215.74 grams of Ag, 175 grams of H₂S with how much mass of Ag does it react?

[tex]mass of Ag=\frac{175 grams of H_{2}S* 215.74 grams of Ag}{34 grams of H_{2}S}[/tex]

mass of Ag= 1,110.43 grams

But 1,110.43 grams of Ag are not available, 300 gra s are available. Since you have less mass than you need to react with 175 grams of H₂S, silver Ag will be the limiting reagent.

Mass of iron sulfide obtained : 22 g

Reaction

Fe+S⇒FeS

8 grams of sulfur and 28 grams of iron are taken for the reaction

mol of Fe(Ar=56 g/mol) :

[tex]\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{28}{56}\\\\mol=0.5[/tex]

mol of S(Ar=32 g/mol) :

[tex]\tt mol=\dfrac{8}{32}=0.25[/tex]

Limiting reactant ⇒ S(smaller mol ratio), excess reactant : Fe

mol of FeS based on limiting (S) ⇒0.25(mol ratio from equation = 1 : 1)

Mass FeS(MW=88 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=0.25\times 88\\\\mass=22~g[/tex]

Answer:

hydrogenation

Explanation:

Liquid vegetable oils are converted to solid fats such as margarine by a process known as hydrogenation.

Commercial production of margarine requires the hydrogenation of liquid oil at a relatively high temperature and pressure and in the presence of a catalyst. During the process, a solid catalyst (usually, nickel) is added to a preheated liquid vegetable oil before the dispersion of the hydrogen gas. The polyunsaturated vegetable oil, thus, becomes saturated or partially saturated in the process. The quality of the final product depends on the degree of hydrogenation or saturation.

The process of hydrogenation turns liquid vegetable oils into solid fats like margarine. therefore, the correct option is option B.

Unsaturated molecules undergo a chemical reaction called hydrogenation in which hydrogen gas is added. Unsaturated fats and oils are frequently transformed into saturated forms, which makes them more stable and solid at room temperature. Margarine, shortenings, and other solid fats are frequently made using this method. In order to increase stability, decrease reactivity, or change the physical and chemical properties of organic compounds, hydrogenation can also be employed to diminish or eliminate double or triple bonds in such molecules.

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Your question is incomplete but most probably your full question was,  

Electronic configuration of x will be1s² 2s² 2p⁶ 3s² 3p⁶ 4s² and electronic configuration of y will be 1s² 2s² 2p⁴.

Given,

Atomic number of x = 20

Atomic mass = 40

Atomic number of y = 8

Atomic mass of y= 16

Electronic configuration, sometimes referred to as electronic structure or electron configuration, is the arrangement of electrons in orbitals that surround an atomic nucleus.

A standardized notation is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital. For instance, the electronic structure of carbon, which has an atomic number of 6, is 1s² 2s² 2p².

So, According to the question-

As we already know that atomic number equals number of electrons.

Hence,

Electronic configuration of x = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Electronic configuration of y = 1s² 2s² 2p⁴

The given question is erroneous , the correct question should be-

Elements x and y are represented as x: atomic number 20, atomic mass 40 and y: atomic number 8 , atomic mass 16 for each of the elements write the electronic configuration using the s, p, d and f notations.

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​

Answer:

I Believe it is 4 orbitals s,p,p,p or aka sp^3

Explanation:

Answer:

Four because its hybridization is SP3 which means one s and three p orbitals combine to form hybrid orbitals

Explanation:

Answer:54.82%

Explanation:

Percentage of carbon = mass of carbon in that compound/ mass of the compund *100

216/394*100 = 54.82%

Answer: 311kpa

Explanation:

Explanation:

1. The three factors are;

- Increasing the surface area of the reactants

- Using a catalyst

- Increasing temperature

2. Raising the temperature of a reaction mixture is the same as increasing the kinetic energy of the reacting molecules.

3. This reaction is an exothermic reaction. In exothermic reaction, the temperature of the system (mixture) decreases while that of the surroundings increases.

4. Reactions that releases energy to the surroundings are exothermic reactions.

5. All the options is an example of exothermic process because heat is being removed from the system except;

B. Evaporation of water - This is because it must absorb heat from the surroundings making it endothermic.

Answer: The energy of the infrared radiation is [tex]19.8\times 10^{-21}J[/tex]

Explanation:

The relationship between wavelength and energy of the wave follows the equation:

[tex]E=\frac{hc}{\lambda}[/tex]

E= energy

[tex]\lambda [/tex] = wavelength of the wave  =[tex]1.0\times 10^{-5}m[/tex]

h = Planck's constant  = [tex]6.626\times 10^{-34}Js[/tex]

c = speed of light = [tex]3\times 10^8m/s[/tex]

[tex]E=\frac{6.626\times 10^{-34}Js\times 3\times 10^8m/s}{1.0\times 10^{-5}m}[/tex]

[tex]E=19.8\times 10^{-21}J[/tex]

Thus energy of the infrared radiation is [tex]19.8\times 10^{-21}J[/tex]

Answer:

the answer is C ( i hope your teacher explains

Answer:

1000

1/100,000

1000000000000000

1/100

70,000

Answer:

The number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in the number of electrons in all shells of an element is represented in the periodic table as the element's atomic number.

Explanation:

I hope that helps

Atoms gain or lose electrons to become stable by achieving octet in their valence shell. The number of electrons lost or gain is dependent upon the number of valence electrons.

The vertical columns in periodic table is called groups and the horizontal rows are called periods. A group contains elements with same number of valence electrons and similar chemical and physical properties.

According to octet rule, atoms when achieve 8 electrons in their valence shell become stable. Thus when atoms have extra electrons or deficient of electrons will lose or gain electrons to attain octet.

Metals in the left side of periodic table are all electropositive and will lose their extra valence electron. Whereas, non-metals are electron - deficient  needs to gain electron into their valence shell.

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Moles of gas=19.75

The gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

V=150 L

P=4.2 atm

T=389 K

[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{4.2\times 150}{0.082\times 389}\\\\n=19.75[/tex]

The new volume = 542.6 ml

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

V₁=591 ml

T₁=20+273=293 K

T₂=-4+273=269 K

[tex]\tt V_2=\dfrac{V_1.T_2}{T_1}\\\\V_2=\dfrac{591\times 269}{293}\\\\V_2=542.6~ml[/tex]

Answer:

is there anyway u could ut it in diffrent words i do not unders stand

Explanation:

Answer:

I'd say it would be; A. Faster in Bath 1 as molecules collide more frequently in Bath 1 than Bath 2

Explanation:

I'm currently taking the FLVS exam... If I get it wrong then I'll edit asap!

Yep! I got it right. I'll provide a screenshot...