What is the problems in the HYDROELECTRIC?? Please tell me I will mark you !!!!

Answer: I'm guessing but I think this is the answer and also what I put in mine sorry if wrong

Explanation: I think it's "B.- Slightly Acidic" srry if it's too late-

Answer:

23 : 80

Not sure

No time for pictures

Answer:

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Answer:

Electrons

Explanation:

The reaction rate with mass of the tablet being 1000 mg and volume of water 0.200 L is

(i) If Reaction time is 34.5 sec – 145 mg / L / sec is the reaction rate

(ii) If Reaction time is 28.9 sec – 173 mg / L / sec is the reaction rate

(iii) If Reaction time is 23.1 sec – 216 mg / L / sec is the reaction rate

Given that, Mass of tablet = 1000 mg

                  Volume of water = 0.200 L

We need to find the reaction rate

We know that, Reaction rate =  \(\frac{mass of tablet / volume of water}{reaction time}\)

(i) Reaction rate if reaction time is 34.5 sec = \(\frac{1000 / 0.200}{34.5}\) = 145 mg / L / sec

(ii) Reaction rate if reaction time is 28.9 sec = \(\frac{1000/0.200}{28.9}\) = 173 mg / L / sec

(iii) Reaction rate if reaction time is 23.1 sec = \(\frac{1000/0.200}{23.1}\) = 216 mg / L / sec

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carbon tetrahydride: CH₄

there are 4 atoms H in 1 mole CH₄

N = n x No

No = avogadro's = 6.02 x 10²³

number of molecules CH₄:

= 0.25 x 6.02 x 10²³

= 1.505 x 10²³ molecules

for 4 atoms of H:

= 4 atoms/molecules x 1.505 x 10²³ molecules

= 6.02 x  10²³ atoms

Answer:

Number of moles of hydrogen gas produced when 15.3 g of sodium reacts with water = 0.333 moles of hydrogen gas

Explanation:

The reaction between sodium metal and water is given by the chemical equation below:

2Na(s) + 2H₂O(l) ------> 2NaOH(aq) + H₂(g)

From the equation of reaction above, 2 moles of sodium reacts with 1 mole of water to produce 2 moles of sodium hydroxide and 1 mole of hydrogen  gas.

mole ratio of sodium and hydrogen gas is 2:1

molar mass of sodium =23 g/mol:

number of moles of sodium present in 15.3 g = mass/molar mass

number of moles of sodium present in 15.3 g = 15.3 g/ 23 g/mol = 0.665 moles

number of moles of hydrogen gas produced = 0.665 * 1/2 = 0.333 moles

Therefore, number of moles of hydrogen gas produced when 15.3 g of sodium reacts with water is 0.333 moles

ANSWER

The initial volume of the acid is 260mL

EXPLANATION

Given that;

The final volume of the ethanoic acid is 4.5L

The final concentration of the ethanoic acid is 1.0 mol/L

The initial concentration of the ethanoic acid is 17.4 mol/L

Follow the steps below to find the volume of the ethanoic acid

Step 1; Apply the dilution formula

Step 2; Substitute the given data into the formula

Therefore, the initial volume of the acid is 260mL

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 18.015 g

volume = 15 cm³

We have

\(density = \frac{18.015}{15} \\ = 1.000833333...\)

We have the final answer as

Hope this helps you

Explanation:

mass = moles × molar mass

0.25 moles × (2 × 16g/mol) = 8 g of O2

Plugging these values into the formula, we find that HCl has the lowest average speed, followed by O2, and then H2 with the highest mass average speed. Therefore, the order of increasing average speed is HCl, O2, and H2.

The average speed of a gas is directly proportional to its temperature and inversely proportional to its molar mass. At the same temperature, lighter gases will have higher average speeds than heavier gases. H2 has the lowest molar mass among the three gases and thus the highest average speed. O2 has a higher molar mass than H2 but lower than HCl, and therefore it has a moderate average speed. HCl has the highest molar mass among the three gases and thus the lowest average speed.

To determine the order of increasing average speed, we can use the formula for the average speed of gas particles, which is given by: Average speed = √(8 * R * T) / (π * M)
where R is the gas constant, T is the temperature in Kelvin, and M is the molar mass of the gas.
For HCl, O2, and H2, we can calculate their average speeds at 298 K using their molar masses:
- HCl: 36.5 g/mol
- O2: 32 g/mol
- H2: 2 g/mol.

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Answer:

53.5 N?

Explanation:

34.77 Joules of work is done on the backpack.

Work-done on any body can be calculated as:

W = F × x, where

F = force

x = displacement or distance

In the question, given that

Force to lift a backpack = 53.5 N

And distance = 0.65 m

Now work-done is calculated as:

W = 53.5 × 0.65 = 34.77 Joules

Hence, 34.77J of work is done.

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Answer:

have one delocalised electron

Explanation:

The elements which are  present of left side of periodic table have similar chemical properties.

Periodic table is a tabular arrangement of elements wherein elements are arranged according to their atomic numbers. It consists of seven horizontal rows called periods  and eighteen vertical columns called groups .

Elements in the same group have similar chemical properties as they have same number of valence electrons. While, electrons in the same period have different valence electrons as electrons are added to same shell and hence have  a little variation in chemical properties.

It is called periodic as properties repeat after an interval of certain electronic configuration. Elements are divided in four blocks depending on their properties.

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Answer

4.76 mol Fe

Procedure

Consider the following balanced equation and determine the limiting reagent using the coefficients method

2Al(s) + Fe₂O3(aq)--> Al2O3(aq) + 2Fe(s)

The lowest amount is the one produced by the iron (III) oxide therefore that is the limiting reagent and 4.76 mol of Fe is the max amount that can be produced of Iron.

Nitrogen transmutes to form an isotope of oxygen. The superscript for oxygen is 17

The subscript for hydrogen is 1

Cobalt-59 accepts a neutron to form a new isotope. The subscript for cobalt is 27

Answer:

Oxygen = 17

Hydrogen = 1

Cobalt = 27

Explanation:

As you get farther from the disturbance that caused them, the amplitude of the water waves is found to decrease.

The term wave refers to a disturbance that transfers energy. While it is true that waves could travel from outer space, that is not the prerequisite upon which they are classified as waves thus the statement that; "X-rays, ultraviolet light, and gamma rays all can travel through interplanetary space, so they are examples of waves" is false.

As you get farther from the disturbance that caused them, the amplitude of the water waves is found to decrease.

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The final temperature of the two substances after they are allowed to reach thermal equilibrium will be closer to the initial temperature of substance B.

This is because the specific heat capacity of substance B is two times that of substance A, meaning it takes twice as much energy to change the temperature of substance B by one degree. Additionally, the mass of substance A is four times the mass of substance B, meaning it has more thermal energy to transfer to substance B.

When the two substances are brought together and allowed to reach thermal equilibrium, the thermal energy will transfer from the substance with the higher temperature to the substance with the lower temperature until they are at the same temperature. Since substance B has a higher specific heat capacity and a lower mass, it will require more thermal energy to reach the same temperature as substance A. Therefore, the final temperature of the two substances will be closer to the initial temperature of substance B.

In conclusion, the final temperature of the two substances after they are allowed to reach thermal equilibrium will be closer to the initial temperature of substance B due to its higher specific heat capacity and lower mass.

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Answer:

I think its pollution?

To determine the most likely untrue statement, more information about the nature and properties of the samples is required.

Based on the information provided, it is difficult to determine which statement is probably not true without additional context or details about the samples. However, I can explain what each statement means:
a) NOT Sample #2 was darker: This statement suggests that Sample #2 was not darker than Sample #1.
b) NOT Sample #2 had more intense flavors: This statement implies that Sample #2 did not have more intense flavors compared to Sample #1.
c) NOT Sample #1 was less expensive: This statement indicates that Sample #1 was not less expensive than Sample #2.
To determine the most likely untrue statement, more information about the nature and properties of the samples is required.

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In order to examine many details inside cells, an electron microscope can magnify objects by approximately 500,000 times. A variety of electron microscopes exist. Nanoparticles and atoms can be observed using a transmission electron microscope.

The quantum mechanical model, which draws on concepts from Schrödinger, Pauli, Heisenberg, and other thinkers, is the appropriate one for atoms. It takes a lot of various things into account. Theoretically sound, it is the most frequently accepted model. A more accurate depiction of the structure of atomic clusters, where surface atoms vibrate more intensely than inside atoms, has been revealed thanks to new technology created by physicists to examine atomic vibration in microscopic particles.

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The organization of cells happens in the following way, firstly cells are organized into tissues, which are organized into organs, organs are organized into organ systems, which form your whole body.

The biological organization exists at all levels in organisms. It can be seen at the smallest level, in the molecules which are made up of such things as DNA and proteins, to the largest level, in an organism such as the blue whale (largest mammal on Earth). Similarly, single-celled prokaryotes and eukaryotes demonstrate the order in which their cells are arranged.

Single-celled organisms like amoeba are free-floating and independent living. Their single-celled "bodies" can carry out all the processes of life, such as metabolism and respiration, without any help from other cells. Other single-celled organisms, such as bacteria, can group and form a biofilm. A biofilm is a large group of bacteria that sticks to a surface and makes a protective coating to cover itself. Biofilms can show similarities to multicellular organisms. Division of labor is the process in which one group of cells does a single job (such as making the "glue" that sticks the biofilm to the surface) while another group of cells carries out another job (such as taking in nutrients).

Multicellular organisms execute their life processes through the division of labor. They consist of specialized cells that do specific jobs. However, biofilms don't come under multicellular organisms and are instead called colonial organisms. The difference between a multicellular organism and a colonial organism is that individual organisms from a colony or biofilm can, if separated, survive on their own, while cells from a multicellular organism (e.g., liver cells) cannot.

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The student should weigh out 0.856 grams of \(KIO_3\) to make the solution.

The volume of a solution can be calculated by multiplying its concentration by the amount of solute present. This implies that if the volume and concentration of the solution are known, the mass of the solute can be calculated.

The amount of \(KIO_3\) needed to make a 0.05 M solution of \(KIO_3\) is found using the formula below:

C = n/V

where:

V = Volume of \(KIO_3\)

n = moles of \(KIO_3\)

C = Concentration of \(KIO_3\)

Since the concentration of \(KIO_3\) is known to be 0.05 M and the volume is 80 ml, the moles of \(KIO_3\) can be calculated:

0.05 M = n / 0.080 L

=> n = 0.004 moles

The molar mass of \(KIO_3\) is 39.1 g/mol + 126.9 g/mol + 3(16.0 g/mol) = 214.0 g/mol.

Hence, the mass of \(KIO_3\) to weigh out is:

m = n x M

=> m = 0.004 moles x 214.0 g/mol = 0.856 g

0.856 grams of \(KIO_3\) is needed to make the solution.

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The correct answer is C. A television

Explanation:

Plasma is a particular state of matter that differs from liquid, solid, and gas because plasma is a gas but contains mainly particles that have lost their electrons or ions. This makes plasma have properties other states do not have. Additionally, plasma is now widely used in technologies, including televisions, this is because plasma is used in thousands of small containers to create the images in a Tv. This leads to high quality and precise images. Therefore, the commercial technology that commonly uses plasmas is a television.  

Answer:

c

Explanation:

edge

If ethanol was used to measure the density of the irregular objects, it would not have affected the results at all.

The volume of irregular objects is obtained by displacement method. A known volume of a liquid is measured out and added to a measuring cylinder.

The irregular solid is now added to the set up and the change in volume is noted. This change in volume corresponds to the volume of the object.

If the mass of the irregular object has been previously determined, the density of the object is:

Density = mass/volume

The kind of liquid (ethanol or water) used to determine the density does not affect the results.

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Answer:

360mmHg is the correct answer in its units

Answer: C and D

Explanation:

liquid water For example, the limited temperature range of liquid water (0°C–100°C) severely limits its use. Aqueous solutions have both a lower freezing point and a higher boiling point than pure water.

How hot (or energetic) a substance or radiation is can be quantified by a physical value called temperature.

There are three different types of temperature scales: those like the SI scale that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron in a body; those that only rely on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by actual empirical properties of particulates rather than by theoretical principles.

Temperature is gauged using a thermometer. It is calibrated using a variety of temperature scales that historically defined themselves using various reference points and thermometric materials. The most widely used scale is the Celsius scale, previously called as "centigrade."

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The resistance of a nickel silver wire that is 25 cm long and has a cross-sectional area of 0.05 m² is 0.000425 Ω (or 4.25 × 10⁻⁴ Ω).

The formula for calculating the resistance of a wire is:R=ρL/ATo find the resistance of a nickel silver wire that is 25 cm long and has a cross-sectional area of 0.05 m², we will need to use the formula.

R = ρL/A

Where R is resistance, ρ is resistivity, L is the length of the wire, and A is the cross-sectional area.

We are also given the following constants:

Resistivity of nickel silver = 8.5 × 10⁻⁸ Ωm

Length of wire = 25 cm

= 0.25 m

Cross-sectional area of wire = 0.05 m²

Now we can substitute the given values into the formula and solve for R:

R = (8.5 × 10⁻⁸ Ωm) × (0.25 m) / (0.05 m²)R

= 0.000425 Ω or 4.25 × 10⁻⁴ Ω

Therefore, the resistance of a nickel silver wire that is 25 cm long and has a cross-sectional area of 0.05 m² is 0.000425 Ω (or 4.25 × 10⁻⁴ Ω) (to 3 significant figures).

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