What is the answer to this I need help please

Answer:Ethyne

Explanation:

Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom. Since both carbon atoms are linear in shape, all four atoms lie in a straight line.

2-nonyne molecule is an alkyne. Hence, option B is correct.

Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon-to-carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.

Ethyne is more commonly known under the trivial name acetylene. It is the simplest of the alkynes, consisting of two carbon atoms connected by a triple bond, leaving each carbon able to bond to one hydrogen atom.

Since both carbon atoms are linear in shape, all four atoms lie in a straight line.

Hence, option B is correct.

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Answer:

D

Explanation:

The indivisibility of an atom was proved wrong an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions......

hope i helped

pls mark brainliest,,,,,thanks

John Dalton was the chemist that gave the theory of atoms. His atomic model was incorrect as he said that the atoms cannot be further divided, but they are made of smaller particles. Thus, option D is correct.

Dalton's atomic model stated that all matter is composed of atoms that are made of elements with identical properties and mass. He further stated the formation of the compounds from the molecules.

In the theory, he stated that atoms cannot be divided further and are indivisible. This was proven wrong as the atoms are composed of sub-atomic particles namely, electrons, neutrons, and protons.

Therefore, the statement that atoms are indivisible in Dalton's atomic theory is incorrect.

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Answer:best

Explanation:

Best

Answer:

22.6881 Grams of CO

Explanation:

Fe2O3 + 3CO = 3CO2 + 2Fe

Ratio

1:3 = 3:2

How many grams of CO are needed to produce 30.2 grams of Fe

Fe2O3 Molar mass: 159.69 g/mol

CO Molar mass: 28.01 g/mol

Fe Atomic mass: 55.845

Ok so our end result is 30.2 Grams of Fe, we have 2 Fe so we have 15.1 Grams per Fe

15.1/55.845 = 0.27

So then we multiply this by 3 as we we know the ratio and get get 0.81 required as this is 3CO.

So we need 0.81 Moles of CO so we need 22.6881 Grams of CO.

Answer:

Aluminum ion

Explanation:

I used Google tbh but it has a higher charge then a regular Aluminum atom

Answer:

The answer is 2C8H18 + 25O2 → 16CO2 + 18H2O .

(Correct me if I am wrong)

Answer:

The atom with one outer most electron is sodium

The atom with two outermost electrons is magnesium

The atom with five outermost electrons is phosphorus

Explanation:

A dot structure of an atom shows the number of electrons present on the outermost shell of that atom. In order words, a dot structure shows the valence electrons present on the valence shell of an atom.

Sodium has an atomic number of 11, hence the electrons are arranged in three shells in the following order 2,8,1. This implies that one electron is present on it's outermost shell.

Magnesium has an atomic number of 12. Its electrons are arranged in shells in the order; 2,8,2. Hence, two electrons are present in its outermost shell.

Phosphorus contains 15 electrons(atomic number of 15), these electrons are arranged in shells in the order 2,8,5. Hence there are five outermost electrons present in phosphorus.

Answer:

1 dot sodium

2 dots Magnesium

7 dot Fluorine

5 dot Phosphorus

Explanation:

Answer:

60g/mol

Explanation:

By using nucleon numbers given on the periodic table, the mass of 1 mole of each element is:

C= 12g

H= 1g

O= 16g

Since molar mass is the sum of the masses of each element present in the compound,

Molar Mass (Mr) = 12+3(1)+12+16(2)+1 = 60g/mol

Answer:

polar covalent bond

Explanation:

Answer:

It's an homogeneous Mixture

hehe

Answer:

7.0

Explanation:

second question is 4.90 third question is 3.0 fourth question is 6.6

Answer:

The first answer is 4.6 cm + 2.35 cm =  7.0  cm

The second answer is 8.45 cm – 3.55 cm =  4.90  cm

The third answer is 1.2 cm × 2.54 cm = 3.0  cm^2

Then the last answer is 6.6 cm^3 ÷ 1.00 cm^2 =  6.6  cm

I hope this helps, Its correct on edge 2020 :)

Answer:

[tex]\large \boxed{\text{4.21 mol}}[/tex]

Explanation:

We must do the conversions :

mass of Zn ⟶ moles of Zn ⟶ moles of ZnO

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:     65.38

              Zn + … ⟶ ZnO  + …

m/g:   275

(a) Moles of Zn

[tex]\text{Moles of Zn} = \text{275 g Zn}\times \dfrac{\text{1 mol Zn}}{\text{65.38 g Zn}} = \text{4.206 mol Zn}[/tex]

(b) Moles of ZnO

The molar ratio is 1 mol ZnO:1 mol Zn

[tex]\text{Moles of ZnO} =\text{4.206 mol Zn} \times \dfrac{\text{1 mol ZnO}}{\text{1 mol Zn}} = \text{4.21 mol ZnO}\\\\\text{The reaction produces $\large \boxed{\textbf{4.21 mol}}$ of ZnO}[/tex]

Answer:

91kj/mol;no

Explanation:

Took this before I gotchu.

What is the ΔG, and will this reaction be spontaneous in the forward direction? 91 kJ/mol; no

Gibbs is a free number of power converters

In the active and frequent use of the Gibbs free energy change equation, ΔG is calculated from the fixed values ​​that scientists can measure: the enthalpy and entropy changes of the reaction, and the temperature at which the reaction occurs.

joules

measured in joules in SI) is the maximum amount of non-expansion work that can be extracted from a closed system (one that can exchange heat and work with its surroundings, but no matter) at fixed temperature and pressure. This maximum can be attained only in a completely reversible process.

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Answer:

Yes because magnesium has a more negative reduction potential than aluminum.

Explanation:

The single factor that will determine whether a battery with magnesium as anode and aluminium as cathode will work or not is the respective electrode potentials of the two elements.

Recall that in a battery, oxidation occur at the anode and reduction occurs that the cathode. The reduction potential shows the ease with which a metal is reduced or oxidized. The substance with the most negative reduction potential will function as the anode while the substance with the less negative electrode potential will function as the anode.

The reduction potential of Magnesium is -2.37 V while that of aluminum is -1.66 V. This implies that magnesium must function as the anode and aluminum as the cathode in order to have a spontaneous electrochemical process in the cell.

Answer:

N2 Covalent

CCl4 Covalent

SiO2 Covalent

AlCl3 Covalent

CaCl2 Ionic

LiBr Covalent

Explanation:

With covalent bonds, there is a sharing of electron pairs between the atoms.

With ionic bonds, there is complete transfer of valence electrons between atoms. Formed by the interaction of a metal with a non-metal.

Where:

Electrons aren't transferred in covalent bonds.

Protons aren't  transferred in covalent bonds

Protons aren't shared in covalent bonds

N3-

C4+

Cl-

Si4+ = Metal

O2- = Non-metal

Al3+ = Metal

Li+ = Metal

Ca2+ = Metal

Br  1-, 1+, 5+ = Halogen

N2 = N3- and N3- Covalent

CCl4 = C4+ and Cl- x4 Covalent

SiO2 = Si4+ and O2- x 2 Metal with non metal Covalent

AlCl3 = Al3+ and Cl- x 3 Covalent Though this one is complex as to why because it seems like it should be ionic

CaCl2 = Ca2+ and Cl- x 2 Metal with non-metal Ionic

LiBr = Li+ and Br- Covalent as neither is a non-metal

Answer:

10.41 mL of concentrated 12 M HCl (aq) is needed to prepare a 250mL of 0.5 M HCl solution

Explanation:

Dilution is the procedure to prepare a less concentrated solution from a more concentrated one. The amount of solute does not vary, but the volume of the solvent varies. More solvent is added and the concentration of the solute decreases, as the volume of the solution increases.

In this case it is fulfilled:

Vi * Ci = Vf * Cf

Vi = initial volume

Ci = initial concentration

Vf = final volume

Cf = final concentration

Being:

Replacing:

Vi*12 M= 0.250 L* 0.5 M

Solving:

[tex]Vi=\frac{0.250 L*0.5 M}{12 M}[/tex]

Vi= 0.01041 L= 10.41 mL

10.41 mL of concentrated 12 M HCl (aq) is needed to prepare a 250mL of 0.5 M HCl solution

Answer:

C-Atoms of the reactants rearrange to form a new substance

Explanation:

Answer:

The answer is A.

Explanation:

B. is called a physical reaction

And C. is just a rearrangement.

Answer:

Output voltage = 600 V

Explanation:

Using the transformer equation which simply states that the ratio of the secondary to primary voltages in a transformer equals the ratio of the number of loops in their coils.

Number of input turns/Number of output turns = Voltage of input/voltage of output

10/50 = 120V/voltage of output

Voltage of output = 120 V/0.2

Voltage of output = 600 V

Answer: C. Based in previous data, ten hurricanes may occur in the year 2013.

Explanation:

Inference can be explained as conclusion made from an existing evidence or facts. Option C, best fits an inference statement.

Answer:

C

Explanation:

because everything looks like opinions

Answer:

The name of the hotel can be the Red dust hotel. And the theme could red and rocky

Explanation:

The final temperature of a mixture of 100g of water at 20°C and 50g of water at 50°C is 30°C.

The amount of heat lost by the hotter sample = The amount of heat gained by the cooler water sample

The amount of heat gained by the cooler water sample is: -

Q1₁= m₁c(T – T₁)

The amount of heat lost by the hotter water sample is: -

Q₂ = m₂c(T₂ - T)

Q₁ = Q₂

m₁c(T – T₁) = m₂c(T₂ - T)

T = (m₁T₁ + m₂T₂)/(m₁+ m₂)

Let the final temperature of the mixture of 100g of water at 20°C and 50g of water at 50°C be T.

m₁ = 100g

T₁ = 20°C

m₂ = 50g

T₂ = 50°C

The final temperature of water = (100*20+50*50)/(100+50)

= (2000+2500)/(150)

=4500/150

=30°C

Therefore , the final temperature of a mixture of 100g of water at 20°C and 50g of water at 50°C is 30°C.

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Answer:

It is 1.76 tons under the weight limit.

Explanation:

12.65

-10.89

= 1.76

Answer:

Reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.RT

Explanation:

Answer:

1) Increase temperature

2) Decrease temperature

3) Increase concentration of reactants

4) Increase pressure

5) Decrease pressure

Explanation:

Le Chatelier's Principle Fundamentals states that a chemical reaction at equilibrium that undergoes changes to pressure, temperature, or concentration, this will cause the equilibrium to shift in the opposite direction to offset the change.

1) Increase temperature

2) Decrease temperature

3) Increase concentration of reactants

4) Increase pressure

5) Decrease pressure

Answer:

The criteria listed in order of importance are;

1) To be inflated in the event of a collision in order to protect the occupants of the front of the vehicle

2) To be able to withstand the load of the breaking force of the occupants in the front seat of the vehicle during a collision

3) To be relatively tough so as to resist being torn on impact with a sharp object

The constraints listed in order of importance are;

1) How is the model design able to sense a collision that requires the airbag to be inflated

2) The uncertainty of the load the airbag will withstand upon collision

3) The possible hazard that could be caused by the gas used to inflate the airbag

4) The usage/interaction tendency between the vehicle occupant and the airbag system

Explanation:

In order to produce an effective design, it is important to be able to foresee the possible deficiencies of an idea so as to be able to mitigate the problems before an actual incident happens.

The criteria that should be considered include:

It should be noted that when designing an engineering solution, there are some criteria and constraints that must be considered in order to achieve the objective of the engineering solution.

Some of the criteria that should be considered include the fact that it should be inflated in the event of a collision, the ability to withstand the impact of the braking force of the occupants, durability, etc.

The constraints listed include how the model design is able to sense a collision that requires the airbag. The possible hazards that can be caused by the gas. Also, it's vital to consider the interaction tendency between the airbag and the occupants of the vehicle.

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Answer:

Fuels made from oil mixtures containing large hydrocarbon molecules are not efficient as they do not flow easily and are difficult to ignite. Crude oil often contains too many large hydrocarbon molecules and not enough small hydrocarbon molecules to meet demand. This is where cracking comes in

Explanation: