Answer correctly for brainliest

only answer the question with the 4 choices in the middle

Answer:

D

Explanation:

The number of representatives depends on the population size. A state with fewer residents will have less representatives than a state with more residents.

Answer:

40.27% Bromide in the original sample

Explanation:

The reaction of bromide ion, Br- with Pb(NO3)2 is:

2 Br- + Pb(NO3)2 → PbBr2(s)

Where the precipitate produced is PbBr2

To solve this question we must find the moles of PbBr2 filtered using its mass. Twice these moles we can find the moles of Br- and its mass. Percent bromide is:

Mass Bromide / Mass Sample (0.5014g) *100

Mass PbBr2:

1.7895g - 1.3258g = 0.4637g PbBr2

Moles -Molar mass: 367.01g/mol-

0.4637g PbBr2 * (1mol / 367.01g) =

0.001263 moles PbBr2 * (2mol Br / 1mol PbBr2) = 0.002527 moles Br

Mass Br -Molar mass: 79.904g/mol-

0.002527 moles Br * (79.904g / mol) =

0.2019g Br

Percent Bromide:

0.2019g Br / 0.5014g * 100 =

Answer:

A I think

Explanation:

Answer:

Difference in temperature

Explanation:

According to thermodynamics, heat transfer occurs when heat from a high temperature reservoir moves to a low temperature reservoir. For heat to be transferred, the two objects should have different temperatures with one having more temperature than the other. Heat transfer in solids is by conduction, in fluids is by convection and by radiation.

Answer:

B, No reaction will occur

Explanation:

Copper as compared to lead is less reactive. This is the reason when  lead is added to copper nitrate solution, it replaces the copper and itself combines with nitrate to form lead nitrate aqueous solution

Lead + Copper(II) nitrate → Copper + Lead (II) nitrate

The same is not the case when the reaction is revered i.e Cu is added to Pb NO3 solution.

Hence, option B is correct

Answer: Water is a much better conductor of heat than air. So when you are surrounded by water, energy can flow from your body (conduction of heat) much more quickly than it would if you were surrounded by air at the same temperature.

Answer:

Explanation:

Não sei desculpa

Answer:

Molarity = moles ÷ liters

to get moles of NaBr divide grams of NaBr by its molar mass (mass of Na + mass of Bromine)

Na = 22.989769

Br = 79.904

molar mass of NaBr = 102.893769

6.6g ÷ 102.893769 = 0.064143826 moles of NaBr

0.064143826 moles ÷ 0.60 liters = 0.1069 molar concentration or 11 %

Answer:

The answer is C = 9.52

Explanation:

I took the test

The pOH of a solution that has a pH of 4.48 at 25°C is 9.52. Details about pH can be found below.

pH refers to the power of hydrogen in a substance while the pOH refers to the power of hydroxyll ions. The pH of a solution ranges from 0 - 14 indicating the strength of acidity and alkalinity.

The relationship between the pH and pOH in a solution is given as follows:

pH + pOH = 14

According to this question, a solution at 25 degrees celsius has a pH of 4.48. The pOH of the solution is calculated as follows:

4.48 + pOH = 14

pOH = 14 - 4.48

pOH = 9.52

Therefore, the pOH of a solution that has a pH of 4.48 at 25°C is 9.52.

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hallo! heres you answer

^Extrusive igneous rocks are formed from the cooling lava that flows above the crust and Intrusive Igneous rocks are formed within the earth's interior.^

is the correct one because

-Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. ... Intrusive rocks have a coarse grained texture.

- Extrusive Igneous Rocks: Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth's surface.

Answer:

a 52 Joules

Explanation:

Specific heat capacity of Au = 0.13 J/g° C

mass = 4 gram

initial temperature = 0° C

final temperature = 100° C

We are to determine the amount of energy absorbed

Using the formula:

Q = mcΔθ

Q = 4 × (0.13) J/g° C ×(100-0)

Q = 52 Joules

Answer:

Branched chain

Cycloalkane

Straight chain

Explanation:

Answer: proton and neutron

Explanation:

They both have the mass of 1

Answer:

E) the K+ ions are attracted to the partially positive hydrogen atoms of the water molecule. D) the K+ ions are attracted to the partially negative oxygen atoms of the water molecule. Water is a polar solvent and hexane (C6H14) is a nonpolar solvent. Which of the following correctly describes the solubility of the solute? A) weak electrolyte.

Explanation:

Answer:

It’s answer #2

Explanation:

I only know this because i just got it wrong

The correct structural formula for the acid that is poured into the beaker is CH₃COOH.

Acetic acid is also called ethanoic acid. It is form as a byproduct of fermentation. It forms vinegar. Vinegar is 4 to 6% acetic acid with water.

It is widely used in homes as cleaning agent, in cooking, washing etc.

Thus, the correct option is 2, CH₃COOH.

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Answer:

d and e

Explanation:

We have 5 solutions with different molar concentrations, that is, the quotient between the number of moles of solute and the liters of solution. This can be expressed as mol/L or M. The most dilute would be the one having the less number of moles of solute per liters of solution, that is, solution d or e, which have the same concentration. If we order them from the most diluted to the most concentrated, we get:

d = e < a < b < c

Answer:

The value becomes 0.0821 L-atm/K⁻¹-mol⁻¹.

Explanation:

The value of gas constant is 0.0821.

We know that, the ideal gas law is as follows :

[tex]PV=nRT\\\\R=\dfrac{PV}{nT}[/tex]

Where

P is pressure

V is volume

T is temperature

In order to use the Ideal Gas Constant of 0.0821, the units are follows :

Volume = Litre (L)

Pressure = atm

Amount = mol⁻¹

Temperature = K⁻¹

So, the value becomes 0.0821 L-atm/K⁻¹-mol⁻¹.

Answer:

::Due to the iron inside the earth.

Explanation:

Imagine a sphere of Iron, as big as two-third the size of the moon and as hot as 5700 Kelvin. That is the Earth’s core.

The iron core isn't in its liquid form even at that temperature because it is crushed under immense gravity. This core is surrounded by 2000 km of other metals like iron and nickel which are in their molten state.

The temperature is not the same at every point in this molten layer. The hotter and less dense matter rises up, and the warm denser matter sinks. This causes convectional currents in the interior of the Earth.

Because of the Earth’s spin, there is a force that established called the Coriolis force which causes swirling whirlpools here too.

This flow of molten metals produces electric currents which generate self-sustaining magnetic fields. And as a result of the Coriolis force, all these combined effects add up to produce one big magnetic field engulfing the Earth aligned in one direction.

Answer: The balanced equation is [tex]V_{2}O_{5} + 5Ca \rightarrow 2V + 5CaO[/tex].

Explanation:

A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.

For example, [tex]V_{2}O_{5} + Ca \rightarrow V + CaO[/tex]

Here, number of atoms on reactant side are as follows.

The number of atoms on product side are as follows.

In order to balance this equation, multiply Ca by 5 on reactant side. Multiply V by 2 and CaO by 5 on product side. Therefore, the equation can be rewritten as follows.

[tex]V_{2}O_{5} + 5Ca \rightarrow 2V + 5CaO[/tex]

Now here, number of atoms on reactant side are as follows.

The number of atoms on product side are as follows.

Since, there are same number of atoms on both reactant and product side. So, the equation is now balanced.

Thus, we can conclude that the balanced equation is [tex]V_{2}O_{5} + 5Ca \rightarrow 2V + 5CaO[/tex].

Answer:

A. In the Presense of a base

Explanation:

Just took the test from Edgunuity

Phenolphthalein turns pink in color in the presence of a base. Therefore, option A is correct.

Phenolphthalein is a chemical compound that is often used as an acid-base indicator. It is colorless in acidic solutions and pink or red in basic solutions.

Phenolphthalein is often used in titrations to determine the endpoint of a reaction between an acid and a base. It can also be used as a laxative or in forensic investigations to test for the presence of blood.

Phenolphthalein has a chemical formula of C₂₀H₁₄O₄ and is synthesized by reacting phthalic anhydride with phenol in the presence of a strong acid catalyst. It is also used as a pH indicator. phenolphthalein has been found to have potential health benefits, such as reducing the risk of cancer, improving digestion, and reducing inflammation. Therefore, option A is correct.

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A bimolecular reaction can be kinetically first order in behaviour provided one of the reactants is taken in such a large excess that its concentration may hardly change. Such a reactant will not contribute to the order. Thus, a bimolecular reaction will be of first order. These reactions are known as pseudo chemical reactions.

Answer:

Expensive and low storing capacity.

Explanation:

The storing of renewable energy is a big challenge for us because this renewable energy can't be stored for a long due to expensive and low storing capacity. There are two challenges about the storing of renewable energy is that the battery are very expensive and can store very less amount of energy which makes unable to store the renewable energy. The scientists should make a storing device which is not too much expensive and has more storage capacity.

Answer:

I think the answer is C. D. And F.

Explanation:

I’m sorry if I’m wrong :(

Answer:

I think the answer is BCD and maybe F

Explanation:

Answer:

1.91 atm

Explanation:

Step 1: Calculate Henry's constant (k)

A gas has a solubility (C) of 2.45 g/L at a pressure (P) of 0.750 atm. These two variables are related to each other through Henry's law.

C = k × P

K = C/P

K = (2.45 g/L)/0.750 atm = 3.27 g/L.atm

Step 2: Calculate the pressure required to produce an aqueous solution containing 6.25 g/L of this gas at constant temperature.

We have C = 6.25 g/L and k = 3.27 g/L.atm. The required pressure is:

C = k × P

P = C/k

P = (6.25 g/L)/(3.27 g/L.atm) = 1.91 atm

Answer:

Number of moles =20

Number of molecules present = 20 multipled by avogadro's number.

Answer:

extreme/high

low

minerals

Explanation:

When Magma forms within the mantle what is the most often result? The most often result of this is high temperatures, and low pressure.

Answer:

1 mole.

Explanation:

1.6x10^23 = NA = 1 mole of any substance.