Question: What is the specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0°C?

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Answer:

[tex] \boxed{ \sf \: R_f \: value \: of \: sample \: 1 =0.3142}[/tex]

In Analytical Chemistry chromatography is widely used for the separation of samples.

In the given diagram, mixture of 8 samples are separated on the basis of their polarity, the distance travelled by solvent is 35 mm, distance travelled by sample 1 is 11 mm & similarly distance travelled by sample 2,3,4,5,6,7 are 15,31,4,22,25,33 in mm respectively.

Rf Value: Rf value is retention factor which tells about relative absorption of each sample & range of Rf value is 0-1.

Formula to calculate Rf value is

[tex] \sf R_f \: value = \frac{distance \: moved \: by \: sample}{distance \: moved \: by \: solvent} [/tex]

Now, solving for Rf value of sample 1

Given:

Distance moved by sample 1 = 11 mm

Distance movedby solvent = 35 mm

To find:

Rf value of sample 1 = ?

Solution:

Substituting the given data in above formula,

[tex] \small \sf R_f \: value = \frac{distance \: moved \: by \: sample \: 1}{distance \: moved \: by \: solvent} \\ \small \sf R_f \: value = \cancel\frac{11 \: mm}{35 \: mm} = 0.3142[/tex]

[tex] \small \boxed{ \sf \: R_f \: value \: of \: sample \: 1 =0.3142}[/tex]

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Answer:

C20

Explanation:

Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions. Example: Carbon

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. It can be decomposed into simpler constituents using chemical reactions.

Example: Carbon monoxide.

Thus chemical symbol represents an element is C20

Pretty sure this is what you're looking for.

Answer:

17.51M

Explanation:

first we make out what we've been given .

Mass of ethanol= 91.9g

volume of water = 481.0ml

volume of solution= 597.5ml

density of water = 1.0g/ml

density of ethanol= 0.789g/ml.

firstly find the volume of ethanol since the total volume of the solution is 597.5ml and we've been given the volume of water which is 481.0ml , we subtract the volume of water from the volume of the solution , to find out the volume of ethanol .

volume e =597.5ml - 481.0ml

= 116.5ml

Then we find the molecular mass of ethanol , which is 45.04g/mol .

then we find the number of moles of ethanol .

n=mass /molar mass

=91.9g/ 45.04g/mol

=2.04mols .

Then convert the volume from milliliters to liters , by dividing by a 1000 .

v= 116.5/1000

=0.1165L

since we have our number of moles and volume , we can now find the molarity . which is

M=n/v

= 2.04mols /0.1165L

= 17.51M .

The answers of every subquestion is given below:

Percent yield of the reaction is the percent ratio of actual yield to the theoretical yield.It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%.

The theoretical yield is the amount predicted by a stiochiometric calculation based on the number of moles of all reactants present.

This calculation assumes that only one reaction occurs and that the limiting reactant reacts completely.

The actual yield is the quantity of a product that is obtained from a chemical reaction.

          2 C₆H₁₀ + 17 O₂ ⇒ 12 CO₂ + 10 H₂O

1. When you do this calculation for 35 grams of C₆H₁₀, you find that 113 grams of CO2 will be formed.

When you do the calculation for 45 grams of oxygen,You find that 43.7 grams of CO2 will be formed.Because 43.7 grams is the smaller number forming 43.7 grams of product.

2. Oxygen is the limiting reagent

3. 21.4 grams of C₆H₁₀ will be left over.

4.  80.1%

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The pOH of pure water at 40 degree C is 6.8, then the hydronium ion concentration in pure water at this temperature is 6.3 × 10⁻⁸M.

Relation between the pH and pOH will be represented by the following equation:

pH + pOH = 14

Given that, pOH of water = 6.8

Then pH will be pH = 14 - 6.8 = 7.2

We know that, pH = -log[H⁺]

[H⁺] = [tex]10^{-pH}[/tex]

[H⁺] = [tex]10^{-7.2}[/tex] = 6.3 × 10⁻⁸M

Hence concentration of hydronium ion at that temperature is 6.3 × 10⁻⁸M.

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Answer:

232.92K

Explanation:

The initial temperature of the argon is 232.9K.Calculation of the initial temperature:Since V₁  = 5dm³P₁  = 0.92atmT₂ = 30°CV₂ = 5.7LP₂ = 800mmHgHere we have to applied the gas lawP1V1/T1 = P2V2/T2Here p, v, and T are pressure, volume and temperature respetivelyAnd, 1 and 2 depict the initial and final states.Now we need to converttemperature to K and pressure into atmSo, it be like T₂  = 30°C  = 273 + 30 = 303KP₂  =  800mmHg;        760mmHg  = 1 atmSo, = 800/760 = 1.05 atmNow0.92*5 /T = 1.05*5.7/303So, the temperature is 232.92K

Answer:

3 g

Explanation:

new mass = (1/2)^n * original mass

where n = number of half lives

(1/2) ^2 * 12

= 3 g

Answer: +5

Explanation:

The oxidation number of potassium is +1, and the oxidation number of oxygen is -2. So, for the compound to have a charge of 0, the oxidation number of chlorine must be +5.

Answer:          gugygy

Explanation:

When aqueous sodium phosphate reacts with aqueous copper(ii) sulfate then the formation of Cu₃(PO₄)₂ precipitate and aqueous solution of sodium sulfate takes place.

Double displacement reactions are those reactions in which two elements are displaced within the reaction.

Given chemical reaction is:

Na₃PO₄(aq) + CuSO₄(aq) → Cu₃(PO₄)₂(s) + Na₂SO₄(aq)

In the above reaction sodium and copper ions are displaced between each other by which Cu₃(PO₄)₂ precipitate and aqueous solution of sodium sulfate is formed.

Hence in the above reaction precipitate of Cu₃(PO₄)₂ is formed.

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Explanation:

The balanced equation is CH4(g)+2O2(g)→CO2(g)+2H2O(g) In the burning reaction, methane (CH₄) reacts with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O): CH₄ + 2 O₂ → CO₂ + 2 H₂O This reaction obeys the law of conservation of mass because nothing was created or destroyed just rearranged

Answer:

Reactants: CH4

                   O2

Products: CO2

                 H20

Explanation:

Because i got it right on edge

Answer:

Keep the pace of 5 C up until you get to about 60 C. Than Measure the totl amount of heat added to the factor of these numbers.

Explanation:

Answer:

3 DIFFERENT ELEMENTS

Explanation:

H - Hydrogen

S- Sulfur

O- Oxygen

Therefore there are 3 elements

Work done is the exchange of heat from the system and the surrounding. The final volume of the gas in the system is 2.45 L.

Work done is the product of the pressure and the change in the volume of the gas in the system. The formula for work done is given as,

[tex]\rm w = -P\Delta V[/tex]

Given,

Initial volume = 5.35 L

Work done = 588 J

Pressure = 2.00 atm

Work done in joules is converted to L atm as, 588 joules = 5.80 Litres-atmosphere

Substituting values in the above equation:

[tex]\begin{aligned}\rm w &=\rm -P(V_{f} - V_{i})\\\\5.80 &= \rm - 2 (V_{f} - 5.35))\\\\5.80 - 10.7 &= \rm -2V\\\\&= 2.45\;\rm L\end{aligned}[/tex]

Therefore, 2.45 L is the initial volume of the gas.

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Answer:

recycle and dispose of trash properly

minimize use of fertilizer

use environmentally friendly modes of transportation

scientists say creating marine refuges where fishing, mining, and recreating are off limits, make the reefs healthier, and so more resilient

The value of concentration of H₃O⁺ of the polyprotic acid solution 0.140M H₃C₆H₅O₇ is 2.1×10⁻⁴M.

Ka is the acid dissociation constant which shows its value in the equilibrium condition.

Given chemical reaction with ICE table is:

                          H₃C₆H₅O₇   →   C₆H₅O₆⁻   +   H₃O⁺

Initial:                    0.140                 0                  0

Change:                    -x                   +x                 +x

Equilibrium:         0.140-x                x                   x

Ka for the acid = (x)(x) / (0.140-x)

For the H₃C₆H₅O₇ acid value of Ka = 3.2 × 10⁻⁷

We can neglect the value of x from the term 0.140-x, as x is vey small as compared to 0.140 so that equation becomes,

3.2 × 10⁻⁷ = x² / 0.140

x = 2.1×10⁻⁴M

Hence the concentration of H₃O⁺ is 2.1×10⁻⁴M.

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Answer:

Eating tomatoes is one of the best things you can do. These beautiful, red fruit not only

thrill your taste buds and brighten your plate, they help fight disease. Studies show that

people who eat tomatoes, and lots of them, lower their risks of cancer because

tomatoes contain lycopene, a powerful antioxidant. -Tomatoe Farmers of America.

A. Is the bias negative or positive

B. What words, phrases or sentences made the paragraph biased or not biased?

Answer:

Candy Tomatoes are a low calorie fruit that is high in fiber. Their sweet flavour is a result of the high sugar content, but is balanced by the nutrition and health benefits provided by vitamin C, potassium, lycopene, and antioxidants.

Explanation:

Yeah it is good for people who didn't like the taste of tomato.

Answer:

2.00 Cups

Explanation:

This question isn't really possible without the density of the sugar, you can pack it tighter like if you have sugar cubes for example, but a quick search gives a density of 1.59 g/mL, so that what I will use.

Let's get the number of grams of sucrose (molar mass 342.3 g/mol) we have by taking 342.3 g/mol * 0.880 mol. Moles cancel and we get 301.224 grams of sucrose.

Now we just need to take the density, there is one mL for every 1.59 grams of sucrose, so we will take (301.224 g)/(1.59 g/mL). grams cancel and we are left with 478.94616 mL.

The question asked for cups (I'm assuming US cups) though, so let's convert by dividing by 240 to give us 1.995609 cups. Or when we round to sig figs we get 2.00 cups.

Answer:

The answer is C: They are a key ingredient found in household bleach

CaCl₂+2AgNO₃⇒Ca(NO₃)₂+2AgCl

mole CaCl₂: 3.5 g : 111 g/mole = 0.032

mole AgNO₃: 6.39 g : 170 g/mole = 0.038

mole: coefficient

CaCl₂: 0.032 : 1 = 0.032

AgNO₃: 0.038 : 2 = 0.019

AgNO₃ smaller= limiting reactant, then CaCl₂ = excess reactant

Answer:

See below

Explanation:

goes down....turns more acidic   as HCl is added to water

Answer:

Decrease

Explanation:

There will be a decrease in the pH of the water solution.

The molality of a solid solution containing 867 g of aluminum and 14.9 g of copper is 0.27 mol/kg.

The molality of a solution is a way to express the concentration of the solute in a given mass of solvent.

Molality of solution is given by the formula given below:

In the given solid solution, aluminium is the solvent while copper is the solute.

Mass of solvent = 867 g = 0.867 Kg

Moles of solute = mass/molar mass

molar mass of copper = 64.0 g

moles of solute = 14.9/64 = 0.233 moles

Molality of solution = 0.233 mol/0.867 kg = 0.27 mol/kg.

Therefore, the molality of a solid solution containing 867 g of aluminum and 14.9 g of copper is 0.27 mol/kg.

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The conclusion which can be drawn from the results that more ice added caused a greater change in temperature.

Temperature of any substance will change if some amount of energy is absorbed or released by that substance in the form of heat.

If in simple water, we add some amount of ice then energy or heat from the whole mixture will released as a result of which temperature of the water decreases. And decrease in temperature will depend on the amount of added ice.

Hence, more ice added caused a greater change in temperature.

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The reactants are Option C , dilute hydrochloric acid and magnesium which turns methyl orange from red to orange .

Indicators are substances that change colour when they are added to acidic or alkaline solutions.

Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory.

Methyl orange in an acidic medium turns Red or orange , Yellow in neutral medium and Yellow in akaline medium .

Phenolphthalein in an acidic medium turns Colourless , Colourless in neutral medium and Pink in akaline medium .  

Magnesium reacts with hydrochloric acid to produce hydrogen gas

Mg (s) + 2 HCl (aq) → MgCl₂ (aq) + H₂ (g)

In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium.

So the solution is acidic and therefore when methyl orange are added to a reaction mixture methyl orange turns from red to orange

Therefore the The reactants are Option C , dilute hydrochloric acid and magnesium which turns methyl orange from red to orange and H₂ gas is produced .

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Answer:

The pressure if the volume becomes 6.8L would be 4.19atm

Explanation:

Boyle's law:

P1 V1= P2 V2

P1 = 0. 6 atm

P2 = ?

V1 = 47. 5 L

V2 = 6. 8 L

P2 = 0.6 × 47.5 ÷ 6.8

P2 = 4.19 atm

The pressure if the volume becomes 6.8L is 4.19atm

Answer:

The Clean Water Act and the Endangered Species Act.

Explanation:

mining operations must follow these regulations or else they will not be able to use the land

Answer:

Answer: (b) F

Explanation:

Sodium has 1, magnesium has 2 and Aluminium has 3 electrons in its outermost shell whereas Fluorine has 7 electrons in its outermost shell hence Fluorine does not lose electrons easily.

The electronic configuration of fluorine is 2,7.

Fluorine is the ninth element with a total of 9 electrons.

The first two electrons will go in the 1s orbital.

The next 2 electrons for F go in the 2s orbital.

The remaining five electrons will go in the 2p orbital. Therefore the F electron configuration will be 1s22s22p5.