i have an science question and i don’t know how to do it, Which math function can be used to find the time an object moved if you have the
speed?

Answer:

a charge on a solar battery cell

Answer:

Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions.

Explanation:

Answer:

Explanation:

A testable question is the one which can be answered using experiment and research. A non-testable question is the one which cannot be answered using experimental trials.

Example:

Non-testable: Which is more better ice-cream or chips?

Testable: Which is more better nutritionally ice-cream or chips?

Here, in the non-testable question no parameter was given for comparision and analysis hence, it cannot be tested experimentally. Whereas, in the testable question nutritional quality is to be compared between the two food items.

Answer:

gas

Explanation:

it makes a gas there

The amount of energy released would be 1917.96 kJ.

We can start by calculating the number of moles of methane used up in the reaction:

Number of moles = mass / molar mass

molar mass of CH4 = 12.01 + 4(1.01) = 16.05 g/mol

Number of moles = 38.0 g / 16.05 g/mol = 2.37 mol (rounded to two decimal places)

Next, we can calculate the total energy released by the combustion of this amount of methane:

Energy released = energy released per mole x number of moles

Energy released = 808 kJ/mol x 2.37 mol = 1917.96 kJ (rounded to two decimal places)

Therefore, if you used up 38.0 g (or 2.37 mol) of methane in 5 minutes, you would have released approximately 1917.96 kJ of energy.

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Answer:

Explanation:

The pressure required can be found by using the formula for Boyle's law which is

\(P_1V_1 = P_2V_2\)

Since we are finding the required pressure

\(P_2 = \frac{P_1V_1}{V_2} \\\)

From the question we have

\(P_2 = \frac{6 \times 1200}{200} = \frac{7200}{200} = \frac{72}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

36.8%

Explanation:

Ferrous sulfate has the composition 36.8% Fe, 21.1% S and 42.1% O.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 56 × 3.5

We have the final answer as

Hope this helps you

Answer:

we need we need to calculate normality of solution to find out gram equivalent of solution

To prepare 50 ml of a solution, containing 5 grams/liter of salt, the amount in grams of salt we need is 0.25 grams.

To prepare 50 ml of a solution containing 5 grams/liter of salt, we need to use the following formula:

Mass of salt = volume of solution x concentration of solution

Mass of salt = 50 ml x 5 g/L

Convert the volume to liters:

50 ml ÷ 1000 ml/L = 0.05 L

Substitute the values into the formula:

Mass of salt = 0.05 L x 5 g/L

Mass of salt = 0.25 g

Therefore, we need 0.25 grams of salt to prepare 50 ml of a solution containing 5 grams/liter of salt.

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The amount of diamine silver chloride = 8.87 g

Given

10 g AgCl

1.00 L of 0.100 M NH3

Required

the amount of diamine silver

Reaction

AgCl + 2 NH₃ → [Ag(NH₃)₂]Cl

mol AgCl :

= mass : MW

= 10 g : 143,32 g/mol

= 0.0698

mol NH₃ :

= M x V

= 0.1 x 1

= 0.1

NH₃ as a limiting reactant

mol [Ag(NH₃)₂]Cl based on NH₃ :

= 1/2 x mol NH₃

= 1/2 x 0.1

= 0.05

Mass diamine silver :

= 0.05 x  177.3822 g/mol

= 8.87 g

They would all have the same atomic number but they would have different mass numbers.

Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei. Since the number of neutrons affects the atomic mass of an element, isotopes of the same element can have different masses.

Isotopes of an element have the same number of protons, which determines the element's atomic number. Isotopes can have different physical and chemical properties due to their different masses.

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Answer:

The fly cells must be compared with human cells

Explanation:

Dr. Gracia's aim is the development of a potential cancer treatment. Remember that the treatment is meant for human beings.

Usually, the pre-clinical trials of the treatment is carried out on other organisms and the success rate is evaluated before trial on humans.

If protein W has been effective on flies, its effect on human cells should also be diligently compared before conclusions are drawn regarding the therapeutic effects of protein W.

The option that best describes how to correct the Wiliam error, is The third result, should state that the kinetic energy of the ejected electrons depends only on the frequency of the photons. Correct answer: letter D.

Since, the best way to correct Wiliam's error is to edit the third result to state that the kinetic energy of the ejected electrons depends only on the frequency of the photons. This can be done by replacing the existing sentence with the new sentence, or simply adding it as an additional statement.

The photoelectric effect, first explained by Albert Einstein in 1905, is the phenomenon in which electrons are emitted from the surface of a metal when light of a certain frequency, or energy level, is shone upon it.

The photoelectric effect was first observed by William Hallwachs in 1887. Hallwachs observed that when light was shone on a metal, an electric current was produced. This current was proportional to the intensity of the light and independent of its frequency, leading him to conclude that the energy of the light was being transferred to the electrons in the metal.

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Answer:410.6 g

Explanation:

The standard Gibb’s Free Energy for the reaction \(Ag_2O\) (s) + 2 \(HNO_3\) (aq) → 2 \(AgNO_3\) (s) + \(H_2O\) (l) is -508.46 kJ/mol.

To calculate the standard Gibbs free energy change, we need to use the following equation:

ΔG° = ΣnΔGf°(products) - ΣnΔGf°(reactants)

where ΔGf° is the standard Gibbs free energy of formation of the compound and n is the stoichiometric coefficient of the compound in the balanced chemical equation.

We can look up the values of ΔGf° for each compound involved in the reaction and plug them into the equation:

\(Ag_2O\) (s): ΔGf° = -31.05 kJ/mol

\(HNO_3\) (aq): ΔGf° = -207.13 kJ/mol

\(AgNO_3\) (s): ΔGf° = -124.64 kJ/mol

\(H_2O\) (l): ΔGf° = -237.13 kJ/mol

Note that the standard Gibbs free energy of the formation of elements in their standard state is zero.

Using the stoichiometric coefficients from the balanced chemical equation, we have:

ΔG° = (2 mol)(-124.64 kJ/mol) + (1 mol)(-237.13 kJ/mol) - (1 mol)(-31.05 kJ/mol) - (2 mol)(-207.13 kJ/mol)

ΔG° = -508.46 kJ/mol

Therefore, the standard Gibbs free energy change for the reaction is -508.46 kJ/mol.

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Answer:

even though the particles of a liquid are moving, they are attracted to each other so they don't spread far apart to become a gas.

Explanation:

"but some do when they evaporate"

In liquids, the particles are allowed to move freely rather than the solid. The gaseous particles can move more freely than liquids.

In liquids, the particles are placed randomly and thus are allowed to move freely but they do not become a gas as liquids are slightly less compressible than gases.  Even though the particles of a liquid are moving, they are attracted to each other so they don't just spread far apart to become a gas.

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Answer:

D.  Helium

Explanation:

By definition, the atomic number of an element is the number of protons in its nucleus.  2 protons mean atomic number 2:  Helium.

As the number of protons and electrons are  same in an atom,helium atoms all have 2 protons.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer: To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above. Use uppercase for the first character in the element and lowercase for the second character.

Explanation:

The mass of a mole of methane molecules is approximately 2.66 x 10^(-23) grams.

To find the mass of a mole of methane (CH4) molecules, we need to calculate the molar mass of methane and then multiply it by Avogadro's number.

The molecular formula of methane (CH4) tells us that it consists of one carbon atom (C) and four hydrogen atoms (H). To calculate the molar mass, we add up the atomic masses of each element.

Carbon (C) has an atomic mass of approximately 12.01 amu, and hydrogen (H) has an atomic mass of approximately 1.01 amu.

Molar mass of methane (CH4) = (1 x Carbon atomic mass) + (4 x Hydrogen atomic mass)

                            = (1 x 12.01 amu) + (4 x 1.01 amu)

                            = 12.01 amu + 4.04 amu

                            = 16.05 amu

Now, to convert the molar mass from atomic mass units (amu) to grams, we use the given conversion factor:

1 amu = 1.6606 x 10^(-24) grams

Molar mass of methane in grams = 16.05 amu * (1.6606 x 10^(-24) grams/amu)

                            ≈ 2.66 x 10^(-23) grams

Therefore, the mass of a mole of methane molecules is approximately 2.66 x 10^(-23) grams.

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Answer: Extensive!

Explanation:

At the point in the titration where 354 ml of 0.21 M HCOOH was added to 126 ml of 0.9 M NaOH, the pH is approximately 1.67.  

To find the pH at the point in the titration where 354 ml of 0.21 M HCOOH was added to 126 ml of 0.9 M NaOH, we can use the following steps:

Write the balanced chemical equation for the reaction between formic acid and sodium hydroxide:

HCOOH(aq) + NaOH(aq) → O(l) + CO(g) + NaOH(aq)

Use the volume of the unknown acid solution (354 ml) and the volume of NaOH solution needed to neutralize it (126 ml) to find the concentration of formic acid:

[HCOOH] = [HCOOH] x V

[HCOOH] = 354 ml x 0.21 M

[HCOOH] = 77.6 mM

Use the molarity of the formic acid and the volume of NaOH solution to find the concentration of NaOH:

[NaOH] = [NaOH] x V

[NaOH] = 126 ml x 0.9 M

[NaOH] = 115.6 mM

Use the concentrations of the acid and base to find the stoichiometric equation for the reaction:

[HCOOH] = [NaOH] x (1 + [HCOOH]/[NaOH])

[HCOOH] = 77.6 mM x (1 + 77.6 mM/115.6 mM)

[HCOOH] = 80.4 mM

Use the balanced stoichiometric equation and the volumes of the acid and base to find the change in volume of the solution during the titration:

ΔV = [HCOOH] x V_initial - [HCOOH] x V_final

ΔV = 80.4 mM x 354 ml - 80.4 mM x 126 ml

ΔV = 1284 ml - 1056 ml

ΔV = 228 ml

Finally, use the change in volume to find the volume of NaOH solution needed to neutralize the formic acid:

ΔV_NaOH = -ΔV

ΔV_NaOH = -228 ml

ΔV_NaOH = 228 ml

V_NaOH = -228 ml

V_NaOH = 228 ml

Therefore, at the point in the titration where 354 ml of 0.21 M HCOOH was added to 126 ml of 0.9 M NaOH, the pH is approximately 1.67.  

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Balance the neutralization reaction of phophoric acid with magneium hydroxide  is 2 H₃PO₄ + 3 Mg(OH)2 ⇒ Mg₃(PO₄)₂ + 6H₂O

This reaction is known as a neutralization reaction because the acid and base react to form a salt and water by-products. Phosphoric acid reacts with  magnesium hydroxide to produce Magnesium phosphate and water.

A chemical reaction is balanced when there are equal amounts of each element on both sides of the equation.

Therefore, balance the neutralization reaction of phosphoric acid with magnesium hydroxide  is 2 H₃PO₄ + 3 Mg(OH)2 ⇒ Mg₃(PO₄)₂ + 6H₂O

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For a solution containing a non-volatile solute, the proper formula to describe Raoult's law is Psolute = Posoulte. Xsolute

According to Raoult's law, the vapour pressure of a non-volatile solute solution is equal to the mole fraction of the pure solvent's vapour pressure at that temperature.

According to Raoult's law, a solvent's partial vapour pressure in a solution (or mixture) is equal to or the same as the pure solvent's vapour pressure times the mole fraction present in the solution.

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Answer:

The First layer is the troposphere. The troposphere is what we live in. It creates weather for us. Second layer is the Stratosphere. You will find the ozone layer in it. The ozone layer helps protect us from ultraviolet radiation (UV) from the sun. In fact, the ozone layer absorbs most of the UV radiation the sun sends to us. Life as we know it wouldn't be possible without this layer of protection. Third layer is Mesosphere. The Mesosphere is very important for earth's protection. The mesosphere burns up most meteors and asteroids before they are able to reach the earth's surface. Fourth layer is Thermosphere. The Thermosphere absorbs the sun radiation making it very hot.

Explanation: I don't know if you include this one but the fifth layer is the Exosphere. Although the exosphere is the most distance layer of earth's atmosphere it is the layer that is the planet's first line of defense against the sun's rays. It is also the first layer to come into contact and protect the earth from meteors, asteroids, and cosmic rays.

Answer:

Explanation:

The really interesting characteristic of the atmosphere is that each layer has a different temperature range. That is truly incredible when you list them.

The first layer is the troposphere. It is the layer closest to the earth's surface. It is 12 km high and goes from 15oC to - 56oC

The next layer is the Stratosphere. It is 38 km above the  Troposphere and the temperature goes from -56 to -2.5

The third layer is Mesosphere. It is 40 km above the Stratosphere and the temperature goes from -2.5 to -86.5

The next layer is the Thermosphere.  It is 710 km above the Mesosphere. It goes from - 86.5 to 1200o C So this goes from - 100 roughly to + 1200. That is a massive distance. It speaks wonders of how balanced this planet really is.

The final layer is the Exosphere. It goes up to 3000 km. The temperature is consistently at 1200oC

What I don't understand is how you get the layers from a 13 answer of something. What is the first name of the particle? That would seem to have nothing to do with this answer. Please explain because this was a good deal of work that might be for nothing. Mind you the answer is very interesting.

Answer:

Mass of atom is the sum of it protons and electrons. In a neutral atom, the amount of electrons is the same as its protons.

23 electrons = 23 protons (assuming its neutral)

23 Protons + 25 Neutrons= 48 atom mass.

Remember, an electrons mass is so insignificant (About 1/1836 of a protons mass) that it doesn't really play a part in an atom's mass. Therefore, the atom's mass is 48.