In the Lewis symbol for a fluorine atom, there are __________ paired and __________ unpaired electrons.

Answer:

from producers to consumers

Explanation:

Energy is transferred between organisms in food webs from producers to consumers. The energy is used by organisms to carry out complex tasks. The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants

Short answer, don't know but i'm sure the answer is up here

A mixture of heptane and 1-propanol  easily dissolved using DEGS because diethylene glycol sussinate (C8H14O6) 1 propanol easily dilutes and retain surface.

Generally, a mixture speaks to the joining of two different substance in other to achieve a different substance or something combining or becoming matched.

In conclusion, SE-30  is  neutral in nature, DEGs is a stationary phase containing a non-volatile liquid phase. It also includes polar group OH types,

Hence, using Hydrogen bonding it can easily bind  1-propanol.

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Answer:

B

Explanation:

The particles move freely

Answer:

To investigate the effect of changing the conditions on the rate of a reaction.

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g

The volume of hydrogen gas produced can be measured using a gas syringe.

Method:-

- Support a gas syringe with a stand, boss and clamp.

- Using a measuring cylinder, add 50 cm3 of dilute hydrochloric acid to a conical flask.

- Add a 3 cm piece of magnesium ribbon to the flask. Immediately connect the gas syringe and start a stop clock.

- Record the volume of gas produced every 5 seconds. Continue timing until no more gas is given off.

- When the reaction is complete, clean the apparatus as directed by your teacher.

- Repeat steps 1 to 5 with different concentrations of hydrochloric acid.

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A. The percentage yield of gold chloride is 58%

B. The number of mole of Al produced is 40 moles

2Au + 3Cl₂ → 2AuCl₃

Molar mass of Au = 197 g/mol

Mass of Au from the balanced equation = 2 × 197 = 394 g

Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol

Mass of Cl₂ from the balanced equation = 3 × 71 = 213 g

Molar mass of AuCl₃ = 197 + (3×35.5) = 303.5 g/mol

Mass of AuCl₃ from the balanced equation = 2 × 303.5 = 607 g

We'll begin by determining the limiting reactant

From the balanced equation above,

394 g of Au reacted with 213 g of Cl₂

Therefore,

39.4 g of Au will react with = (39.4 × 213) / 394 = 21.3 g of Cl₂

From the above, both Au and Cl₂ are limiting reactant.

Next, we shall determine the theoretical yield.

From the balanced equation above,

394 g of Au reacted to produce 607 g of AuCl₃

Therefore,

39.4 g of Au will react to produce = (39.4 × 607) / 394 = 60.7 g of AuCl₃

Thus, the theoretical yield of AuCl₃ is 60.7 g

Finally, we shall determine the percentage yield.

Actual yield = 35.2 g

Theoretical yield = 60.7 g

Percentage yield =?

Percentage yield = (Actual / Theoretical) × 100

Percentage yield = (35.2 / 60.7) × 100

Percentage yield = 57.99%

Percentage yield ≈ 58%

Balanced equation

2Al₂O₃ → 4Al + 3O₂

From the balanced equation above,

2 moles of Al₂O₃ produced 4 moles of Al

Therefore,

20 moles of Al₂O₃ will produce = (20 × 4) / 2 = 40 moles of Al

Thus, 40 moles of Al were obtained from the reaction.

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The values of  enthalpy change, entropy change and  temperature all determine the spontenity of a reaction.

A sponteanous reaction is one which has the change in free energy as negative. We know that ΔG = ΔH - TΔS. The spontenity of a reaction depends on;

i. enthalpy change

ii. entropy change

iii. temperature

Since the values in the qestion are not given, the question is incomplete and we can not obtain a numerical value in order to decide the sponteanity of the reaction.

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The genetic constitution of an individual, group, or class.

Explanation:

transmission of mechanisms of inherited characteristics of organisms

Answer:a trait that can be passed down is within your gens Evan if you don’t show the trait you still have the ability to pass it down

Explanation:

Answer:

10.77

Explanation:

The relationship between pH and pOH is

pH + pOH = 14

Plugging in the pOH makes

pH + 3.23 = 14

And solving for pH by subtracting 3.23 on both sides

pH = 10.77

Answer:

It is called "tobacco juice"

Explanation:

When a grasshopper is picked up they spit the brownish liquid known as "tobacco juice." They use it as some sort of defense mechanism to protect them from attacks by predators.

Hope this helps:)...if not then sorry for wasting your time and may God bless you:)

A

Explanation:

What cell structure is best represented by the image?

A.

a permeable exoskeleton

B.

a waterproof nuclear envelope

C.

a non-permeable cell wall

D.

a selectively permeable membrane

[tex] \text{V}_1 = 50 \text{ml }\\ \text{T}_1 = 200 \text{K} \\ \text{V}_2 = ? \\ \text{T}_2 = 400 \text{K}[/tex]

[tex] \text{The Value of V}_2[/tex]

[tex]\frac{ \text{V}_1}{ \text{T}_1} = \frac{ \text{V}_2}{ \text{T}_2}[/tex]

[tex] \frac{50}{200} =\frac{ \text{V}_2}{400} \\ \\ \fbox{cross multiplying} \\ \\ \implies 200 \times V_2 = 50 \times 400 \\ \\ \implies V_2 = \frac{50 \times 400}{200} \\ \\ \implies V_2 = \frac{50 \times \cancel{ 400} { \: \: \: }^{2} }{ \cancel{200}} \\ \\ \implies V_2 = 50 \times 2 \\ \\ \implies V_2 = 100[/tex]

[tex] \therefore \implies V_2 = 100 \text{ml}[/tex]

Answer:

it gives plants life and plants give us oxygen

As the redeposited minerals build up after countless water drops, a stalactite is formed. If the water that drops to the floor of the cave still has some dissolved calcite in it, it can deposit more dissolved calcite there, forming a stalagmite. Speleothems form at varying rates as calcite crystals build up. They are formed from condensation inside a cave, dripping off the ceiling.

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The percent yield shows the extent to which the reactants are converetd into products . The limiting reactant is used up in the reaction.

A limiting reactant is the reactant that is in the least amount in the system.  Now;

Number of moles of Fe =  12.21 g/56 g/mol = 0.22 moles

Number of moles of O2 = 13.54 g/32 g/mol = 0.42 moles

Balanced reaction equation;

3Fe(s) + 2 O2(g) = Fe3O4(s)

If 3 moles of Fe reacts with 2 mole of O2

0.22 moles of Fe reacts with  0.22 moles * 2 mole/3 moles = 0.15 moles

Hence, Fe is the limiting reactant

If 3 mole of Fe produces 1 mole of  Fe3O4(s)

 0.22 moles  of O2   produces   0.22 moles * 1 mole/3 moles of  Fe3O4(s) = 0.1073 moles

Mass of  Fe3O4(s) =0.1073 moles  * 232 g/mol =16.9 g

Number of moles of excess reactant = 0.42 moles - 0.15 moles = 0.27 moles

Mass of excess reactant = 0.27 moles * 32 g/mol = 8.64 g

percent yield = 15.88 g/16.9 g * 100/1

= 93.4%

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Answer:

The answer is It recognizes specific common pathogens. :)

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Based on the fact that only herbicide was used to grow the corn, this means that the resistance type of the corn are caterpillars.

Herbicide are chemicals used to control and kill weeds that could hinder crop production while insecticides are chemicals used to control insect pests.

According to this question, a field of corn was grown with 250 L/ha herbicide and no insecticide. This means that only herbs or weeds are being controlled on the field.

Therefore, it can be said that the corn plants are the type that are resistant to caterpillars, which are examples of insects.

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Answer:

becl2

Explanation:

because

a it has incomplete outer

b it accept electron pair

The sequence of coal from lowest to highest based on organic carbon contained within is peat, lignite, sub-bituminous, bituminous, anthracite.

This is a fossil fuel which is usually black in color and a combustible sedimentary rock.

There are different types of coal with the amount of organic carbon contained within from lowest to highest being shown above.

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The true statements is that nerve cells do not look like skin cells because they make up different organs and have different functions.

Cells are the basic functional and fundamental unit of any living organism.

Each and every cells that are present inside the body have same DNA, but they all have different function and different structures. As nerve cells are present only in the brain and spinal cord part and skin cells are present all over the body.

Hence both the cells are different as they have different functions.

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Answer:

By definition, and this is what Avogadro's constant tells you, 1 mole of nickel must contain 6.022⋅1023 atoms of nickel.

Explanation:

ppm = mg/l = mg/kg

32 mg / 20 kg = 1.6 ppm

The concentration in ppm of sodium fluoride in tap water is 1.6 ppm.

ppm is  an abbreviation for parts per million. It can also be expressed as  milligrams per liter of a solution.It is a measurement which is equal to mass of a substance per unit volume .

One ppm is equivalent to the absolute fractional amount which is multiplied  by a million . It is a best way to describe smaller concentrations in a mixture such as that of gases,liquids or solids . It is a ratio of two quantities   which have  the same unit. In its full form ppm is expressed as one in a million part.

Depending on the substance being measured 1 ppm is expressed in many different ways, out of which preferred ways are microliters per liter , milligrams per liter and micrograms per liter.

For the given problem, concentration in ppm is found out as, since ppm is miiligrams  per liter the concentration is found out as follows:32 mg/20 kg (since kilograms  and liters  are  equivalent) =1.6 ppm

Thus, the  final concentration of sodium fluoride in tap water  which is fluorinated is 1.6 ppm.

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In a reaction involving sodium metal and chlorine gas, the amount of sodium metal required to react with 0.950 grams of chlorine gas would be 0.62 grams

From the balanced equation of the reaction:

2Na (s) + Cl2 (g) ---------> 2NaCl (s)

The mole ratio of Na to Cl2 is 2:1.

Mole of 0.950 grams of chlorine gas = 0.950/70.906

                                                             = 0.0134 moles

Equivalent mole of Na = 0.0134 x 2 = 0.0268 moles

Mass of 0.0268 moles Na = 0.0268 x 22.99

                                           = 0.62 grams

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Answer:

C

Explanation:

Amps measure the flow of Electrons

Answer:

C

Explanation:

is c

Answer:    

I am sure it is the reaction will shift right towards the

product

Explanation:

The Animal meat contains Vitamins, proteins and carbohydrates and many more,

The other food group includes various minerals, (like copper, Calcium, Sodium, Phosphorus, selenium, cobalt, iron, zinc etc) various Amino acids, Fatty acids, water and albumin

The sources of vitamin like B12 are animals, and vegetarian should consume plant based supplements to fulfill the need of essential macromolecules!

[Side note: Meat consumption is secondary cause of increasing global warming Go vegan!]

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Chemical weathering formed is due to acids formation when atmospheric and volcanic gases mix with water.

Chemical weathering is a type of weathering that involved weakening and disintegration of rock by chemical reactions like acid reactions and so on. These reactions include oxidation, hydrolysis, and carbonation. These processes lead to formatiom or destruction of minerals, thus changing the nature of the rock's mineral composition.

Therefore, Chemical weathering is due to acids formed when atmospheric and volcanic gases mix with water.

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