Guys help I got 22 minutes left please

Answer:

Explanation:

The properties that are observed or measured without changing the composition of matter are called physical properties.

color, Temperature, Texture are the physical properties as the composition of matter remains the same.

On the other hand, Radioactivity, Flammability and Reactivity comes under chemical property as during the chemical reactions there might be some changes in the properties.

Answer:

prokaryotic

Explanation:

I got it right

Answer:

I believe it's either a or b but I'm pretty sure that it's a

Answer:

Explanation:

Using H-H equation for the NaH2O4/Na2HPO4 buffer:

pH = pKa + log [Na2HPO4] / [NaH2PO4]

Where pKa of this buffer is 7.198, [Na2HPO4] = 0.058M = moles [NaH2PO4] = 0.042M = moles

Replacing:

pH = 7.198 + log [0.058M] / [0.042M]

Initial pH = 7.34

Now, NaOH reacts with NaH2PO4 as follows:

NaOH + NaH2PO4 → Na2HPO4 + H2O

That means, the moles of NaOH are additional moles of Na2HPO4 and subtracted moles of NaH2PO4.

The moles of NaOH added:

1.0mm³ = 1.0x10⁻³L * (10mol / L) = 0.01 moles

NaH2PO4:

0.042mol - 0.010mol = 0.032moles

Na2HPO4:

0.058mol + 0.010mol = 0.068moles

Replacing in H-H equation:

pH = 7.198 + log [0.068M] / [0.032M]

Final pH = 7.53

Change in pH = 7.53 - 7.34

The change in pH is 0.19 units

Given that the enthalpy change ΔH for the reaction is negative, energy is released during the reaction (Option D)

From the data given above, we can see that the enthalpy change (ΔH) for the reaction is negative.

This simple means that heat energy is lost to the environment.

Therefore, we can conclude that the during the reaction, energy is released (Option D)

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Answer:

D in addition to the original sample. In a file cabinet, she finds a paper labeled "Electrochemistry Activity" which lists five metals: zinc, aluminum, magnesium, silver and tin She is not able to find anything that identifies which metals correspond to which letters. She makes some quick observations, summarized below.

Explanation:

Answer:

90g

Explanation:

I hope this helps plz give brainliest ! :D

Answer:

Ethanol

Explanation:

This is not an redox reaction because the oxidation number of Oxygen atom is not changing.

Answer:

Mechanical energy

Explanation:

Given that,

Potential energy of an object is given by :

P = mgh

The kinetic energy of an object is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex]

Where

m is mass

h is height

v is velocity of the object

The sum of potential and kinetic energy is equal to total energy or the mechanical energy.

Hence, if air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body is equal to mechanical energy.

Answer:

Reaction will move rightwards.

Explanation:

Hello there!

In this case, according to the proposed question, it turns out possible for us to  figure out the effect of the addition of silver nitrate, by using the following representative equation for the formation of the silver chloride precipitate:

[tex]Ag^+(aq)+Cl^-(aq)\rightleftharpoons AgCl(s)[/tex]

Now, due to the addition of silver nitrate, we will be actually adding silver ions to the solution, which means that, in terms of the Le Ch atelier's principle, the reaction will shift to the right towards the formation of more silver chloride precipitate.

Best regards!

Answer:

Two Helium atoms

If two carbon atoms underwent fusion (of 600 million kelvin) you would get two helium atoms.

Answer:

I think B but I'm not sure.

Answer: Amplitude of the light wave impacts brightness; the wavelength is what impacts/is associated with color.

Answer:

There was no reaction

Explanation:

1.Did a reaction occur? Explain your answer. If a reaction occurred, also provide a possible chemical equation describing the reaction.

When a reaction occurs, the initial moles of each species decreases to produce a determined product. If the initial moles of reactant = final moles there was no reaction:

Initial moles A:

0.100L * (1.0mol / L) = 0.100 moles A

Final moles A:

0.200L * (0.5mol / L) = 0.100 moles A

Initial moles B:

0.100L * (1.0mol / L) = 0.100 moles B

Final moles B:

0.200L * (0.5mol / L) = 0.100 moles B

As the moles in the beginning = Moles after the mixture

There was no reaction

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the electronic configuration of Nb²⁺ is [Kr]4d³.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The atomic number of Nb is 41. The electronic configuration of Nb is [Kr] 4d⁴ 5s¹. The electronic configuration of Nb²⁺ is [Kr]4d³. Nb²⁺ also has an odd number of valence electrons. The superscripts represents the number of electrons in each orbitals.

Therefore, the electronic configuration of Nb²⁺ is [Kr]4d³.

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Answer:

The answer is C

Explanation:

I did it on edge

Answer:

correct answer is d)

Explanation:

This answer demonstrates law of conservation of mass because the mass of the products is equal to the mass of reactants with the help of the coefficients which is the process known as balancing. This answer also includes the correct formulas, as Br is a gas so it MUST be written as Br2. hope this helps:)

2Al(s) + 3Br2(1) - 2AlBr3(s) is the  correct formulas and demonstrates conservation of mass.

Every action has an equal and opposite response, states Newton's Third Law. This indicates that any force applied to an item will have an equal and opposite-directed response force of the same magnitude. A force pair is the collective name for these connected forces.

Each individual object will have a different force pair with each other object in systems of numerous objects where all things interact. In the case of charged particles, the charge of each object will dictate the direction of each force in the force pair.

Similar charges will cause particles to repel one another by directing their forces away from one another. With their forces pointing in the same direction, particles with opposing charges attract one another.

Therefore, 2Al(s) + 3Br2(1) - 2AlBr3(s) is the  correct formulas and demonstrates conservation of mass.

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Answer:

Temperature is a common type of controlled variable. If a temperature is held constant during an experiment, it is controlled. Other examples of controlled variables could be an amount of light, using the same type of glassware, constant humidity, or duration of an experiment.

Explanation:

Answer:

You will need 12.0 moles of F₂

Explanation:

Based on the chemical equation, 2 moles of AlF₃ are produced when 3 moles of F₂ are added in an excess of Al.

Using this expression: 2mol AlF₃ = 3mol F₂ we can find the moles of F₂ as follows:

8.00 mol AlF₃ * (3mol F₂ / 2mol AlF₃) =

Answer:

[tex]\boxed {\boxed {\sf 39.13 \ Liters}}[/tex]

Explanation:

We want to find the new volume given the temperature, so we use Charles's Law. This states the volume of a gas is directly proportional to the temperature. The formula is:

[tex]\frac {V_1}{T_1}=\frac{V_2}{T_2}[/tex]

We know the original volume is 20.0 liters and the temperature is 23.0 degrees Celsius. The temperature changes to 45.0 degrees Celsius, but we don't know the new volume. Substitute the known values into the formula.

[tex]\frac {20.0 \ L}{23.0 \textdegree C}=\frac{ V_2}{45.0 \textdegree C}[/tex]

We are solving the new volume, so we need to isolate the variable V₂. It is being divided by 45.0 degrees Celsius. The inverse of division is multiplication, so we multiply both sides by 45.0 °C.

[tex]45 \textdegree C *\frac {20.0 \ L}{23.0 \textdegree C}=\frac{ V_2}{45.0 \textdegree C}* 45 \textdegree C[/tex]

[tex]45 \textdegree C *\frac {20.0 \ L}{23.0 \textdegree C} = V_2[/tex]

The units of degrees Celsius cancel.

[tex]45 *\frac {20.0 \ L}{23.0}= V_2[/tex]

[tex]39.1304348 \ L=V_2[/tex]

If we round to the nearest hundredth, the 0 in the thousandth place tells us to leave the 3.

[tex]39.13 \ L \approx V_2[/tex]

The new volume of the balloon is approximately 39.13 Liters.

Answer:

The volume of the solution is 0.305 liters.

Explanation:

Molar mass is the amount of mass that a substance contains in one mole. The molar mass of K₂Cr₂O₇ is 294 g / mole. Then you can apply the following rule of three: if by definition of molar mass 294 grams of the compound are contained in 1 mole, 180 grams are contained in how many moles?

[tex]moles=\frac{180 grams*1mole}{294 grams}[/tex]

moles= 0.61

Molarity is a measure of the concentration of a substance that is defined as the number of moles contained in a certain volume. So, the molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

[tex]molarity=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case:

Replacing in the definition of molarity:

[tex]2 M=\frac{0.61 moles}{volume}[/tex]

Solving:

[tex]volume=\frac{0.61 moles}{2 M}[/tex]

volume= 0.305 liters

The volume of the solution is 0.305 liters.

Answer:

The plants in the northern and southern states during the summer receive the most sunlight and experience a growth period.

Explanation:

The plants in the northern and southern states during the summer receive the most sunlight and experience a growth period because in the summer season, plants receive more solar radiation as compared to winter season. Plant needs more solar radiation for higher growth. Photosynthesis is the process which helps the plant to produce more vegetation and this will only happens when the sunlight is high so we can say that summer season enables the plant to have more vegetative growth.

Answer: b

Explanation none

i made this up dont listen to me

Answer:

hey here is the answer to your question.

Explanation:

1) Write a balanced equation for the reaction occurring. (*Iron occurs in a few different oxidation states, but I will assume we're referring to Fe(II) or Fe2+)

Fe + CuSO4 -> Cu + FeSO4

2) Calculate the number of moles of each reactant.

Fe: 1.924 g * (1 mol / 55.85 g) = 0.03455 mol Fe

CuSO4: 0.1363 L * (0.0750 mol / 1 L) = 0.01022 mol CuSO4

3) Determine the limiting reactant. Because we have fewer moles of copper(II) sulfate and are reacting both reactants in a 1:1 ratio, we will run out of copper(II) sulfate first, making it the limiting reactant.

4) Convert moles of the limiting reactant to moles and grams of product of interest.

0.01022 CuSO4 (1 mol Cu / 1 mol CuSO4 ) (63.55 g Cu / 1 mol Cu) = 0.6495 g Cu

Answer:

See Explanation

Explanation:

The reactivity of a metal towards water depends on the position of the metal in the electrochemical series. Metals that are high up in the series do react violently and spontaneously with water. Metals that are lower in the series are sometimes unreactive in water.

Hence, potassium reacts very rapidly with water to yield KOH and hydrogen gas while gold does not react with water.

SO2 react with water to form sulphuric acid hence SO2 is called an acid anhydride.

The reaction occurs in the following steps;

2SO2(g) + O2(g) ------->2SO3(g)

SO3(g) + H20(l) ------>H2SO4(aq)

Answer:

done

Explanation: