Help please ! ASAP neeeeeed and answerrrrrr

Answer: Hello your question is incomplete attached below is the complete question with the missing diagrams

a) The angle = 120°

  hybridization = sp2

b)  The angle = 120°

  hybridization = sp2

Explanation:

a) using VSPER to predict bond angles

Given that there is the presence of 1 double bond to C and 2 single bonds one to C and one to H around the marked atom which equals 3 sets of electrons surrounding the central atom.

hence according to VSPER theory the angle = 120° while the Hybridization = sp2

b) Using VSPER to predict bond angles at marked atom

Given that there is  There is 1 double bond to C and 2 single bonds to the different C atoms respectively around the marked atom, which makes 3 sets of electorns surrounding the central atom

hence according to VSPER theory the angle = 120° while the Hybridization = sp2

Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite.

Answer:

380

Explanation:

I couldn't find the answer anywhere so this is the correct answer. I got it graded.

Answer:

Explanation:

THE BEST ANSWER IS CCC

Answer:

[tex]H _{3}O {}^{ + } [/tex]

Hydroxonium ion

Answer:

0.188mol

Explanation:

Using the formula as follows:

mole = mass/molar mass

Molar mass of hypomanganous acid, H3MnO4 = 1(3) + 55 + 16(4)

= 3 + 55 + 64

= 122g/mol

Mass of H3MnO4 is given as 22.912 g

Hence;

moles = 22.912 ÷ 122

number of moles = 0.188mol

Answer:

C. An electron has a high probability of being in certain regions.

Explanation:

In the electron cloud model, there are no electron-orbits around the nucleus but a cloud. This cloud has various densities with respect to distance from the nucleus. The most dense region of the cloud (which is the region close to the nucleus) is where electrons has the highest probability of existence.

The model explains that an electron a greater chance of being in the region closer to the nucleus. Thus, an electron has a high probability of being in certain region of the cloud about the central nucleus. And an electrostatic force exists between the nucleus and the electrons.

Answer:

c

Explanation:

Answer:

subscript is 3

Explanation:

the  subscript is the number that is slightly lower than a # which in this case it's O

this indicates that there's 3 oxygen atoms

Answer:

the answer is 1 ‍♀️

Explanation:

Answer:

D; the pollen sticks to the stigma

Explanation:

When a flower is pollinated, the pollen sticks to the stigma. However, it is not always pollinated by insects (birds and other factors can as well), pollen can be transferred from different flowers (as long as they're the same species) and pollination doesn't stick to the anther.

Answer:

d

Explanation:

because when pollution occurs than the insects move to the flower to sick nectar and then pollan giains stuck in the insect body

Answer:

true

Explanation:

Answer:

Each photon has a specific amount of energy​

Explanation:

Answer:

Yes

Explanation:

Due to pollution, greenhouse gasses, etc

Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.

Answer:

1.25 moles of magnesium chloride are produced

Explanation:

Based on the reaction:

Mg(s) + 2HCl (aq) → MgCl₂(s) + H₂(g)

1 mole of magnesium, Mg, reacts with 2 moles of hydrochloric acid, HCl, to produce 1 mole of magnesium chloride, MgCl₂ and 1 mole of hydrogen gas.

To solve this question we have to tak, from the chemical equation:

2 mol HCl = 1mol MgCl₂

That means, the moles of MgCl₂ produced from 2.50mol HCl are:

2.50 mol HCl * (1mol MgCl₂ / 2mol HCl) =

Answer:

V₂ = 0.5 L

Explanation:

Given that,

Initial volume, V₁ = 2.5 L

Pressure, P₁ = 350 kPa

New pressure, P₂ = 1750 kPa

We need to find the new volume if the temperature remains constant. The mathematical relation between P and V is :

[tex]P\propto \dfrac{1}{V}\\\\or\\\\\dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}[/tex]

Where

V₂ is new volume

So,

[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{350\times 2.5}{1750}\\\\V_2=0.5\ L[/tex]

So, the new volume is equal to 0.5 L.

Answer:

[tex]1 \: ml = \frac{1}{1000} l \\ 7.65 \times {10}^{5} \: ml = \frac{7.65 \times {10}^{5} }{1000} \\ = 765 \: l[/tex]

Answer:

The scientific method attempts to minimize the influence of bias or prejudice in the experimenter. Even the best-intentioned scientists can't escape bias. ... That's the job of the scientific method. It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results.

Answer:

to get used to them

Explanation:

you have to practice them so that they can get into your head

Answer:

96.3g is the actual yield from this reaction

Explanation:

Have been 113g...

The percent yield of a reaction is defined as one hundred times the ratio between actual yield (Our incognite) and the theoretical yielf (113g). The equation is:

Percent yield = 85.22% = Actual Yield / 113g * 100

0.8522 = Actual Yield / 113g

0.8522*113g =

96.3g is the actual yield from this reaction

Answer:

96.3

Explanation:

Just took the test

Answer:

103.98 kpa

Explanation:

Pv= nRT

Where

P= pressure of the system=

n= number of moles= 3 moles

T= temperature= 250 K

Volume of the container= 60 liters

R= 0.0821L.atm/K.mol

Substitute the values

Pv= nRT

P= nRT/ V

= (3×0.0821×250)/60

= 1.026 Atm

1atm= 101325 Pascal

1.026 atm= X

= 103984 pasca

Convert to kilopascal

= 103984 pasca /1000

= 103.98 kpascal

Given :

An aqueous solution of 30g of salt in 80g of water.

To Find :

The % mass of the salt.

Solution :

Mass percentage of the salt is given by :

[tex]Mass \ \% = \dfrac{Mass \ of \ salt}{Mass \ of \ salt + Mass \ of \ water}\\\\Mass \ \% = \dfrac{30}{30 + 80 }\times 100 \%\\\\Mass \ \% = 27.27\ \%[/tex]

Hence, this is the required solution.

Answer:

a. Creative solutions are often needed to solve technical problems.

Explanation:

Science in itself is a voyage of discovery. Scientific investigators focusing on various issues are often working hard to find creative solutions to complex technical problems.

In order to find solutions to all these problems bedeviling humanity, scientific investigators must be quite creative. Creativity is always at the bedrock of finding solutions to the complex technical problems of the world which happens to be the ultimate goal of science.

Hence, creativity is indispensable in scientific investigation and creative solutions are often needed to solve technical problems.

Answer:

a. Creative solutions are often needed to solve technical problems

Explanation:

Scientific investigation is the process using the scientific method which consists of empirical techniques in obtaining answers to question raised and used for driving the investigation

The scientist carrying out the investigation into the new area, is therefore required to be creative in adapting the available resources in answering the questions based on the scientific method

Answer:

Increased the concentration

Explanation:

Complete Question

Open the simulation by pushing the play button.  Begin by dragging the concentration tester overto the liquid and add drink mix until the concentration reaches approximately 2.oo mol/L.  This means there are 2.00 moles of the drink mix in 1 Liter of the solution. Add more drink mix until you notice a color change. Have you increased or decreased the concentration? (Higher number means a higher concentration).

Solution

Drink mix is basically the solute which is added to solvent i.e water.

The higher is the amount of drink mix in the solvent, the higher is the concentration of the solute and hence darker is the color of the drink.

Hence, in the case the concentration of the drink has been increased.

Answer:

CD is oxidised

and

Au is reduced

hope helps u

Answer:

NaHCO3(s) → NaOH(s) + CO2(g)

Explanation:

A balanced chemical equation is that in which the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side.

Based on the following equation below, each atom on the reactant side matches the ones on the product side, hence, the equation is said to be balanced. The balanced equation is as follows:

NaHCO3(s) → NaOH(s) + CO2(g)

Answer:

b

Explanation:

b

Answer:

n = 2.18 moles

Explanation:

Given that,

Mass = 127.5g

Molar mass of NaCl = 58.44 g/mol

We need to find the number of moles. We know that,

No. of moles = Given mass/molar mass

Put all the values,

[tex]n=\dfrac{127.5\ g}{58.44\ g/mol}\\\\n=2.18\ moles[/tex]

Hence, there are 2.18 moles of 127.5g of NaCl.

Answer:

A they share two covalent bonds

Answer:

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Answer:

[tex]\boxed {\boxed {\sf 1290 \ g \ PI_3}}[/tex]

Explanation:

We want to convert from moles to grams, so we must use the molar mass.

The molar mass is the mass of 1 mole of a substance. It is the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units (amu).

We are given the compound PI₃ or phosphorus triiodide. Look up the molar masses of the individual elements.

Note that there is a subscript of 3 after the I in the formula. This means there are 3 moles of iodine in 1 mole of the compound PI₃. We should multiply iodine's molar mass by 3, then add phosphorus's molar mass.

Use the molar mass as a ratio.

[tex]\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]

We want to convert 3.14 moles to grams, so we multiply by that value.

[tex]3.14 \ mol \ PI_3 *\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]

The units of moles of PI₃ cancel.

[tex]3.14 *\frac {411.687262 \ g \ PI_3}{ 1 }[/tex]

[tex]1292.698 \ g\ PI_3[/tex]

The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tens place.

The 2 in the ones place tells us to leave the 9.

[tex]1290 \ g \ PI_3[/tex]

3.14 moles of phosphorous triiodide is approximately equal to 1290 grams of phosphorus triodide.