The answer is the specific heat of the gold is 0.129 J/gC .
What is Calorimetry ?It is an experimental method that allows one to calculate the heat change in a chemical process.
Calorimeter is just a reaction vessel. It could be a foam cup, a soda can, or a commercially available bomb calorimeter
Where q represents the heat change in the reaction, the calorimeter and the water. Since you are only measuring temperature, you will need to calculate the heat using it.
The change in heat of the gold is given by:
[tex]\rm q_{gold} = m c_{gold}\Delta T[/tex]
[tex]=78 \times c_{p}\times (175-38.18)[/tex]
The change in heat of the water is given by:
[tex]\rm q_{water} = mc_{p}\Delta T[/tex]
m is the mass of water in the calorimeter in grams,
and delta T is the change in temperature.
where [tex]\rm c_{p}[/tex] is the specific heat of water, which is 4.184 J/gC
mass of water = 25 g of water.
Temperature T₁ = 25°C
Final Temperature = 38.18 °C
Difference between temperature = 13.18 °C
[tex]\rm q_{water} = 25 \times 4.18\times 13.18[/tex]
For a Foam Cup Calorimeter
[tex]\rm q_{water} = q_{cal}\\\\\\\rm 25\times4.18\times13.318 = 78 \times c_{p}\times (175-38.18)\\\\\\On \;solving\; this \;we \;get \;c_{p} = 0.129[/tex]
Therefore the the specific heat of the gold is 0.129 J/gC
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What is the molality of a solid solution containing 867 g of aluminum and 14.9 g of copper?
The molality of a solid solution containing 867 g of aluminum and 14.9 g of copper is 0.27 mol/kg.
What is the molality of a solution?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:
Molality = moles of solute/kilogram of solventIn 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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Calculate [h3o ] of the following polyprotic acid solution: 0. 140 m h3c6h5o7
The value of concentration of H₃O⁺ of the polyprotic acid solution 0.140M H₃C₆H₅O₇ is 2.1×10⁻⁴M.
What is Ka?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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Different amounts of ice was added to several samples of water. The results are shown in the table. Which conclusion can be drawn from the results? A) more ice added caused a greater increase in temperature B) more ice added caused a greater change in temperature C) the final temperature of all the samples was the same D) the initial temperature was responsible for the temperature differences
The conclusion which can be drawn from the results that more ice added caused a greater change in temperature.
Why temperature of substance changes?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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Convert 0.880 moles of sucrose to cups of sugar
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.
I will give Brain list and lot of points
Answer: gugygy
Explanation:
2. Which of the following elements does not lose an electron easily? (a) Na (6) F (c) Mg (d) Al
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.
Aqueous sodium phosphate plus aqueous copper(ii) sulfate
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.
What is double displacement reaction?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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A solution has a [OH-] of 1 x 10^-12 M. What is the [H3O+] of the solution?
Please look at image. the green colored blocks indicate the..
A. alkali metals
B. alkaline metals
C. noble gases
D. halogens
A gas occupies 47.5 Lat 0.6 atm.
What is the pressure if the volume becomes 6.8 L?
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
in this equation, 2kclo3 = 2kcl + 3o2
whats the oxidation number of cl in 2kclo3
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.
The pOH of pure water at 40 oc is 6.8. What is the hydronium concentration, [H30 ], in pure water at this temperature
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.
What is the relation between pH and pOH?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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If a rock sample originally contained 12 g of uranium 235, how much will be left after 2 half lives?
Answer:
3 g
Explanation:
new mass = (1/2)^n * original mass
where n = number of half lives
(1/2) ^2 * 12
= 3 g
Suppose 3.5g of calcium chloride reacts with 6.39g of silver nitrate.
How many moles of calcium nitrate would be produced?
Balanced Equation =
Limiting Reactant =
Excess Reactant =
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
name two regulations that mining operations must follow to reduce the impact they have on the environment?
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
PLEASE SOMEBODY EXPLAIN THIS :(((
Answer:
[tex] \boxed{ \sf \: R_f \: value \: of \: sample \: 1 =0.3142}[/tex]
Explanation:In Analytical Chemistry chromatography is widely used for the separation of samples.
In thin layer chromatography, the mixture of components are separated on the basis of their polarity. The solvent solution(mobile phase) that we use are non polar & silica gel( TLC paper made of/stationary phase) are polar.Consider the mixture we have taken consist of two samples having large polar difference.Due to opposite nature of silica gel(polar) & solvent solution (non polar) the movement become easy & due to capillary action solvent solution rise to the top.The mixture of sample we have taken, the sample have less polarity have high peak or they travel more distance than that of more polar sample when they dipped into the solution.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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A sample of argon has a volume of 5.00 L and the pressure is 0.920 atmIf the final temperature is 303.15 Kthe final volume is 5.70 Land the final pressure is 800mm Hg, what was the initial temperature of the argon?
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
Which of the following is not a function of coral reefs?
Answer:
The answer is C: They are a key ingredient found in household bleach
A few drops of methyl orange are added to a reaction mixture. during the reaction, a gas is produced and methyl orange turns from red to orange. what are the reactants?
a- aqueous sodium hydroxide and ammonium chloride
b- aqueous sodium hydroxide and calcium carbonate
c- dilute hydrochloric acid and magnesium
d- dilute hydrochloric acid and aqueous sodium hydroxide
*please tell the correct answer and its reasoning.
The reactants are Option C , dilute hydrochloric acid and magnesium which turns methyl orange from red to orange .
What are Indicators ?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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Use the following equation to answer questions : 2 C6H10 + 17 O2 12 CO2 + 10 H2O a) If I do this reaction with 35 grams of C6H10 and 45 grams of oxygen, how many grams of carbon dioxide will be formed? b) What is the limiting reagent? ___________ c) How much of the excess reagent is left over after the reaction is finished? d) If 35 grams of carbon dioxide are actually formed from the reaction, what is the percent yield of this reaction?
The answers of every subquestion is given below:
What is percentage yield ?
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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How can we prevent coral reefs from dying in the first place?
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
Consider the chemical equation of the combustion of methane. Sort the components of the chemical equation according to whether they are reactants or products. ch4
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
A solution is prepared by adding 91.9 g of ethanol, ch3ch2oh, to 481.0 ml of water. the final volume of the solution is 597.5 ml. assuming the density of water is 1.0 g/ml and the density of ethanol is 0.789 g/ml, calculate the molality of the ethanol in the solution.
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 .
11. How much heat is required to raise the temperature of a 25 gram block of wood from
20 °C to 25 °C?
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:
is tomato candy good for people who didn't like the taste of tomato
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.
I need help with this is for today
from the energy diagram shown to the right.
A) What species has an energy of 250 k)?
b) Calculate to
c) Calculate H
d) Is the overall reaction endothermic or
exothermic?
As hcl(g) is added to water , the ph of the water solutiuon
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.
How many DIFFERENT ELEMENTS are in this compound?
H2SO4
Answer:
3 DIFFERENT ELEMENTS
Explanation:
H - Hydrogen
S- Sulfur
O- Oxygen
Therefore there are 3 elements
A gas has an initial volume of 5. 35l. What is the final volume if 588j of work is done on the gas by a constant external pressure of 2. 00atm?
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.
What is work done?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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Which chemical symbol represents an element?
O H2O
O C20
O H₂CO3
O CO
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.
