preform the following mathematical operation, and report the answer to the correct number of significant figures
1.235 x 2.65 = ?

Answer:

To remedy the stability problem, Bohr modified the Rutherford model by requiring that the electrons move in orbits of fixed size and energy.

Answer:

One of the purposes of the Marshall Plan was to aid nations in economic recovery from WWII.

Explanation:

The Marshall Plan aided the defeated Axis powers because that's one of the reasons it was created, The Marshall Plan was supposed to rehabilitate the economies of the 17 western and southern European countries in order to create stable conditions for democracy to continue.

Answer: Empirical formula, CH; Molecular formula, C2H2

Explanation:

The amount of maximum mass of ethyl alcohol that could we boil with 1000 J of heat, starting from 20°C is 7.08 grams.

Mass of the ethyl alcohol will be calculated by using the below equation as:

Q = mcΔT, where

On putting all these values, we get

m = 1000 / (2.42)(58.37) = 7.079 = 7.08g

Hence required mass of ethyl alcohol is 7.08grams.

To know more about absorbed heat, visit the below link:
https://brainly.com/question/16559442

#SPJ4

Answer:

Hydrogen

Explanation:

These are what hydrogen isotopes look like

Answer:

D

Explanation:

2-bromopropanoic acid is optically active because it contains chiral carbon bonded with 4 different atom ( CH3,H,COOH,Br).

Answer:

10moles

Explanation:

mole ratio = 8:16

therefore

1 mole Li2S forms 2 moles Li

when 5 moles Li2S reacts

5 moles Li2S = 5 x 2 moles Li

= 10 moles Li

Answer: 1.14 M

Explanation:

500 mL is equal to 0.5 L.

So, the molarity is (0.570)/(0.5) = 1.14 M

The balanced symbol equation for Solid potassium fluorine gas → solid potassium fluoride is 2 K + F₂ → 2 KF ⁻.

The reactants are on the left side of the arrow in a balanced equation, while the products are on the right.

The moles in a compound are indicated by the number in front of the chemical formula. Subscripts indicate the number of atoms in a single molecule (numbers below an atom).

Thus, the balanced equation is 2 K + F₂ → 2 KF ⁻.

Learn more about balanced equation

https://brainly.com/question/7181548

#SPJ4

P=nRT/V

P ≈ 1/V = decreasing volume

P ≈ T = increasing temperature

P ≈ n = adding one more mole of helium

Atmospheric gases can be liquefied by applying pressure and lowering temperature.

The IUPAC name of the compound is propanal and acetone.

Propanal is also called propanaldehyde, and it is an aldehyde which has one double bond and oxygen.

Acetone is a ketone. Ketones have functional group of R2CO.

Thus, the IUPAC name of the compound is propanal and acetone.

Learn more about propanal and acetones

https://brainly.com/question/25702257

#SPJ1

3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]

The minimum frequency needed to cause electron ejection is referred to as the threshold frequency.

The energy carried by the incident light is E=hf

Where h is the Planck constant and f is the frequency of the light. The threshold frequency is the frequency that corresponds to the minimum energy needed to eject the electrons from the metal, so if we substitute the threshold frequency in the formula, we get the minimum energy the light must have to eject the electrons:

E=hf

h=6.63 x [tex]10^{-34}Js[/tex]

f=5.65 x [tex]10^{14}s^{-1}[/tex]

E=6.63 x [tex]10^{-34}Js[/tex] x 5.65 x [tex]10^{14}s^{-1}[/tex]

E= 3.745 x [tex]10^{-19}J[/tex]

Thus, 3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]

Learn more about threshold frequency here:

https://brainly.com/question/9172394

#SPJ4

Answer:

it looks smaller for sure ^_^

Answer: It is either through the addition of energy by heat and the transition to a more energetic state or from the removal of energy by heat and the transition to a less energetic state.

Explanation:

Answer:

During phase changes, matter changes from one phase to another one, either through the addition of energy by heat or transmission or the removal of energy with the same process.

Explanation:

Answer:

2S02 + O2 ---> 2SO3

Its balanced now as Reactants = Products.

Answer:

all of the above

Explanation:

chlorophyll in found in virtually all photosynthetic organisms

The partial pressure of carbon dioxide is 75 torr.

Dalton's theory of gas states that total pressure of the mixture of gas sample is equal to the sum of the partial pressure of all the gases present in that sample.

Given that,

On putting values, we get

Partial pressure of carbon dioxide = 825 - (600 + 150) = 75 torr

Hence Partial pressure of carbon dioxide is 75 torr.

To know more about Dalton law, visit the below link:

https://brainly.com/question/9211800

#SPJ4

The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.

Time required for the whole radioactive decay of any substance will be calculated by using the below link:

T = (n)(t), where

Initial mass of Carbon-14 = 120g

Final mass of Carbon-14 = 112.5g

Left mass = 120 - 112 = 7.5g

Number of required half life for this will be:

4 half lives are required, now on putting values we get

T = (4)(5730) = 22,920 years

Hence required time for the decay is 22,920 years.

To know more about radioactive decay, visit the below link:

https://brainly.com/question/24115447

#SPJ1

Answer:

B

Explanation:

Answer:

False

Bouyant force = volume of displaced fluid * density of fluid

The species that is the conjugate acid is HC₂H₃O₂(aq). The correct option is d.

Conjugates acids are those acids which are made when an acid donates a proton to a base according to Bronsted Lowry theory.

In other words, we can say that it is an acid with hydrogen ion. An example is  water (base) reacting with an acid to form the hydronium ion (conjugate acid).

Thus, the correct option is d, HC₂H₃O₂(aq).

Learn more about conjugate acid

https://brainly.com/question/12883745

#SPJ4

89.74% is the percentage yield of the product. Hence, option D is correct.

The percentage can be calculated by dividing the value by the total value and then multiplying the result by 100.

Given data:

Actual yield of product = 2.80 g

Theoretical yield = 3.12 g

Percent yield = ?

Formula:

Percent yield =  [tex]\frac{\;actual \;yield \;X \;100}{theoretical \;yield}[/tex]

by putting values in the formula,

Percent yield =[tex]\frac{2.80 g X 100}{ 3.12 g}[/tex]

Percent yield = 89.74%

Hence, option D is correct.

Learn more about percentages here:

https://brainly.com/question/20758645

#SPJ1

An aqueous solution contains the following ions Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ and more than one precipitate will form are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

Precipitate is the insoluble compound which is present at the bottom of any chemical reaction in the solid state.

If in an aqueous solution Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ ions are present then:

Hence precipitates are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

To know more about precipitates, visit the below link:

https://brainly.com/question/2437408

#SPJ4

There are several things that would happens,if all of the fossil fuels were used.The most important is in bold,but I made a quick list below to note.<3

-War Would Break Out

-The Earth's Climate Would Be Far From Safe & Would Cause A Huge Decrease In Population

-A Huge Portion Of The World Would Be Living In Poverty

-Failing Economies

-A Worthless Planet

-Also want to not that it is almost impossible to run out of fossil fuels, but if we do,it won't be thousands of years in the future.

I HOPE THIS HELPS! & and good luck on your assignment.

Answer:

The answer is B. sound; light

Explanation: