Please help!
Three sections of the periodic table are labeled A, B, and C in the image below.

Which of the following statements is most likely true for an element present in section A?

It is dull and brittle.
It is malleable and ductile.
It is a liquid at room temperature.
It is a poor conductor of electricity.

The cell notation is [tex]Pb_{(s)}[/tex]  [tex]Pb^{2+} _{(aq)}[/tex] ║[tex]Cu^{+2}_{aq}[/tex]  [tex]Cu_{(s)}[/tex] and the cell potential is 0.464

The reaction occurred while losing of hydron is known as oxidation reaction

We can also tell that the reaction occurred while gaining of oxygen atom is known as oxidation reaction.

The reaction occurred while gaining of hydrogen is known as reduction reaction or we can say that the reaction occurred while losing oxygen atom is known as reduction reaction

An electrochemical cell's cell potential is defined as the difference in potential between two half cells. The electrons' capacity to go from one half cell to the other is what causes the potential difference. As a result of the chemical reaction being a redox reaction, electrons can travel across electrodes.

Calculating the Cell potential

E°cell  = E°(reduction) - E°(oxidation)

           = 0.34 - (-0.0124)

           = 0.464

Hence the cell potential is 0.464

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Answer:

c or d

Explanation:

it says it was playing classic music

In this case, the control group or control variable is the greenhouse where the plants are grown in silence, as this group does not receive any music treatment. Therefore, the correct answer is A.

Variables can be defined as any characteristics, number or a quantity that can be measured . It is also  called as a data item . It is called as variable because it can vary and can also have  wide variety of values.

There are 3 types of variables 1) manipulated variable where the condition is specified, 2) responding variable which is dependent on the manipulated variable 3)controlled variable which does not change.

In this experiment, the control group is the group that does not receive the experimental treatment and serves as a basis for comparison.

Thus, the correct answer is A , the silent greenhouse.

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Answer:

Explanation:

Solution

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2 molL

−1

Explanation :

Concentration =

Volume of solution

Moles of solute

We assume that potassium nitrate dissolves in the given volume of solvent without gross change in volume.

Concentration =

101.10gmol

−1

404g

2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.

According to the research, fatty acids, which are long molecules in the form of a hydrocarbon chain, are a component of lipids.

They are hydrophobic and water-insoluble molecules that are formed from the esterification of alcohols with fatty acids.

Lipids are a vital part of the diet of living beings since many vitamins are assimilated in the presence of certain lipids and many fatty acids are essential for animal metabolism.

Therefore, we can conclude that according to the research,  fatty acids, which are long molecules in the form of a hydrocarbon chain, are a component of lipids.

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Answer: D

Explanation:

Reduction involves the gaining of electrons.

However, charge must be balanced, and this is not the case for choice B, but it is the case for choice D

Answer:

C. Ketones and aldehydes

Explanation:

they are both carbonyl functional group

they both have a carbon-oxygen double bond

testosterone is an example of a ketone

formaldehyde is an example of a aldehyde

opentextbcca

wikipedia

Answer:

Ketones and Aldehydes

Explanation:

i just took tha test

Answer:

the answer is hormone

Explanation:

because it is

Answer:

a

Explanation:

from pH of 0-6 is acidic and 7 is neutral above 7 is basic or alkali

The amount of carbon flux in the atmosphere will be 3.3 GtC/yr

The carbon flux in the atmosphere can be calculated by:

1. Removing the amount of carbon that leaves the atmosphere from the amount that enters the atmosphere.

2. Adding the amount of carbon released by fossil fuel burning.

Thus,

Carbon flux = 211.6 - 213.8 + 5.5 = 3.3 GtC/yr

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The substitution product that is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.

A substitution product is a product that is gotten from a reaction in which a group of reactants is replaced by another group in the reaction.

Therefore, the substitution product is supposed to be favoured. The product with retention of configuration is expected to predominate slightly because the leaving group blocks the nucleophile.

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Answer:

See below

Explanation:

Tap water, bottled water and lake water are all examples of FRESH WATER and likely have the same specific gravity  ( or density) .

Ocean water is SALT WATER ....and depending on HOW MUCH salt is in the water, it can be quite a bit denser than fresh water ...which will allow the golf ball ( which is less dense)   to float .

Answer:

frequency = 2.07 x 10¹³ Hz

Explanation:

To find the frequency of the photon, you need to use the following equation:

E = hv

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> v = frequency (Hz)

Since you have been given values for two of the variables (in the correct units), you can plug them into the equation and simplify to find the frequency.

E = hv                                                       <----- General Equation

E = (6.626 x 10⁻³⁴ J*s)v                           <---- Plug in Planck's Constant

1.37 x 10⁻²⁰ J = (6.626 x 10⁻³⁴ J*s)v        <----- Plug in energy (given)

2.07 x 10¹³ = v                                        <----- Divide both sides by 6.626 x 10⁻³⁴

Explanation:

saliva contains and amylase which randomly hydrogen all the one is equal to 4 glycosidic bonds of stars except it's out most bones and those next the branches on the hand glycogen being a highly branched molecule it is evident that amylase won't be a good animal eyes to digest it due to physical structure constance

Gravity increases as the mass of either object increases.

Gravity is the force by which a planet or other body draws objects toward its centre. The force of gravity keeps all of the planets in orbit around the sun.

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

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Moles of benzene

moles of CCl_4

Now

[tex]\\ \rm\Rrightarrow \chi_{C_6H_6}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{\chi_{C_6H_6}}{\chi_{sol^n}}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{0.8}{0.8+0.2}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{0.8}{1}[/tex]

[tex]\\ \rm\Rrightarrow 0.8[/tex]

Answer:

smallest whole number ratios of atoms

Rank the gases Ar, N2, CH4, and C2H6 in order of increasing density at STP.

ans : CH4

Answer:

C.proust

Explanation:

Proust's law of definite proportions.

The law of definite proportions was first put forward by the French chemist Joseph Louis Proust in 1779. The discovery that mass was always conserved in chemical reactions was soon followed by the law of definite proportions, which states that a given chemical compound always contains the same elements in the same proportions by mass.

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Answer:

12.9 g O₂

Explanation:

To find the mass of oxygen gas produced, you need to (1) convert grams KClO₃ to moles KClO₃ (via molar mass from periodic table values), then (2) convert moles KClO₃ to moles O₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles O₂ to grams O₂ (via molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to match the given value (33.0 g).

Molar Mass (KClO₃): 39.098 g/mol + 35.45 g/mol + 3(15.998 g/mol)

Molar Mass (KClO₃): 122.542 g/mol

2 KClO₃ ---> 2 KCl + 3 O₂

Molar Mass (O₂): 2(15.998 g/mol)

Molar Mass (O₂): 31.996 g/mol

33.0 g KClO₃           1 mole                 3 moles O₂            31.996 g
--------------------  x  -------------------  x  -----------------------  x  ------------------  =
                               122.542 g          2 moles KClO₃            1 mole

=  12.9 g O₂

The most likely reason why the potato chunks gained mass is that water entered the potato cells.

The process of Osmosis allows water to pass through the semi-permeable membrane of potato cells.

This happens when the potato cells have less water than the material around them which then leads to water entering the cells to balance the water concentration.

The potato cells will expand and have more mass as a result.

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The velocity of the avalanche is 0.04 miles / sec. If the avalanche lasted for 97 seconds and travels 4.5 miles,

Velocity is a vector expression of the displacement that an object or particle undergoes with respect to time .

The standard unit of velocity magnitude (also known as speed ) is the meter per second (m/s). Alternatively, the centimeter per second (cm/s) can be used to express velocity magnitude.

Given ;

Formula used ;

Velocity = Distance / Time

Therefore,

Velocity =  4.5 miles / 97 sec

              = 0.04 miles / sec

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Answer: [tex]\text{CH}_{4}+2\text{O}_{2} \longrightarrow \text{CO}_{2}+2\text{H}_{2}\text{O}[/tex]

Explanation:

The unbalanced equation is

[tex]\text{CH}_{4}+\text{O}_{2} \longrightarrow \text{CO}_{2}+\text{H}_{2}\text{O}[/tex]

Balancing this equation, we get:

[tex]\boxed{\text{CH}_{4}+2\text{O}_{2} \longrightarrow \text{CO}_{2}+2\text{H}_{2}\text{O}}[/tex]

Answer:

I think its vaccines

Answer:

An energy change occurs during the breaking and forming of bonds.

Explanation:

Answer:

An energy change occurs during the breaking and forming of bonds.

Explanation:

Energy changes occur when bonds are broken or formed.

When a bond is formed, energy is released.

When a bond is broken, energy is stored.

Edge 2022

Thermochemical Reactions Quiz answer

Answer:

8800  cm / s

Explanation:

There are 100 cm / m

  so:    88 m/s  * 100 cm / m =   8800 cm/s  

                     ( see how the 'm' cancels out and you are left with cm /s ?)

Explanation:

Distillation is the separation of mixture of two liquids which differ in boiling point. Through Distillation vapour that is formed spread thoroughly in our environment

Answer:

A) photon

Explanation:

hope it helps and give brainliest if its correct

Answer:

Explanation: