Answer:
+2
Explanation:
I am first with correct answer
Answer:
the oxidation state of iron in FeC2O4 is +2
PPLEASSEEE HELLPPP!!
Answer:
1.8 × 10² J
Explanation:
Step 1: Given data
Mass of the rock (m): 20 gInitial temperature: 10 °CFinal temperature: 29 °CSpecific heat capacity of granite (c): 0.48 J/g.°CStep 2: Calculate the amount of heat absorbed (q)
We will use the following expression.
q = m × c × ΔT
q = 20 g × 0.48 J/g.°C × (29 °C - 10 °C) = 1.8 × 10² J
PbO2 + 4HCl --- PbCl2 + Cl2 + 2H2O who buys electrons and who loses electrons?
Answer: Electrons are taken up by [tex]PbO_2[/tex] and they are lost by [tex]HCl[/tex]
Explanation:
Redox reaction is defined as the reaction in which oxidation and reduction take place simultaneously. It is also called the reaction where the exchange of electrons takes place.
An oxidation reaction is defined as the reaction in which a chemical species loses electrons takes place. In this reaction, the oxidation state of a substance gets increased.
A reduction reaction is defined as the reaction in which a chemical species gains electrons takes place. In this reaction, the oxidation state of a substance gets reduced.
For the given chemical reaction:
[tex]PbO_2+4HCl\rightarrow PbCl_2+Cl_2+2H_2O[/tex]
The half-reactions for this redox rection follows:
Oxidation half-reaction: [tex]2HCl\rightarrow ClO_2 + 2e^-[/tex]
Reduction half-reaction: [tex]PbO_2+2e^-\rightarrow PbCl_2[/tex]
Hence, electrons are taken up by [tex]PbO_2[/tex] and they are lost by [tex]HCl[/tex]
It took 10.40 mL of a NaOH solution to neutralize 0.307 g of KHP. What is the molarity of the NaOH solution
Answer:
0.144 M
Explanation:
First we convert 0.307 g of KHP (potassium hydrogen phthalate, KHC₈H₄O₄) into moles, using its molar mass:
0.307 g ÷ 204.22 g/mol = 0.0015 mol KHP1 mol of KHP reacts with 1 mol of NaOH, that means that in 10.40 mL of the NaOH solution there were 0.0015 moles of NaOH.
Now we calculate the molarity of the NaOH solution:
10.40 mL / 1000 = 0.0104 LMolarity = 0.0015 mol / 0.0104 L = 0.144 MExplain why the coefficients on the left side of the equation don’t necessarily equal the coefficients on the right side of the equation. Is this possible if mass is being conserved?
Answer:
Explanation:
Short answer: Yes.
The coefficients may not be conserved, but mass always has to be. Take this equation as an example
2 Mg3P2 ===> 6Mg + P4
There is a 2 on the left side and 6 and 1 on the right. I hope you mean that the coefficient 2 is not equal to 7.
But let's look a little closer. You have to look at the molecular structure of the left and right side.
2Mg3P2 has 6 Mgs and 4 Ps on the left side.
6Mg is on the right. They are free standing.
P4 has 1 molecule consisting of 4 Ps.
Everything balances.
This is a terrific question to be asking. You need to understand the internal balance numbers vs the molecular ones on the out side.
That sounds like a bit of gobbledygook and it takes a bit of study.
2 Mg3P2 means that Mg3P2 is written twice.
Mg3P2 ==> "3 Mg2+ + 2P3+ and there is another one written the same way.
Mg3P2 ==> "3 Mg2+ + 2P3+
Electronegativity _____ from top to bottom on the periodic table.
No links please :)
Give an example where handpicking is used for separation. (1)
Answer:
If you want to separate black grapes from the mixture of black and green grapes, then you will simply pick black grapes using your hands from the mixture. In this way you are actually using handpicking separation method.
Explanation:
Consider four different samples: aqueous LiBr, molten LiBr, aqueous LiF, and molten LiF. Current run through each sample produces one of the following products at the anode: liquid bromine, fluorine gas, or oxygen gas. Match each sample to its anodic product from aqueous LiBr, Molten LiBr, aqueous LiF, and molten LiFA. Liquid bromine,
B. Fluorine gas,
C. oxygen gas
Answer:
Following are the solution to the given question:
Explanation:
Please find the matching in attached file.
During the electrolysis of Molten LiBr : Li is reduced and Br are oxidized .
Lithium Metal is produced at the Cathod during the electrolysis of Molten LiBR .
In the aquous LiBr : In aquous LiBr potential of Li is greater than the of water then Li is reduced to produce solid Li ion. As well As aqueous LiF ( electrolysis)and Molten LiF electrolysis produce the gas.
aqueous LiF: Oxygen gas.
Molten LiF : Flourine gas.
Calculate the pH of a solution whose H3O+ concentration is 2.1 x 10-3 M. Is the solution acidc, basic, or neutral?
a
The pH of the solution is 2.7 and the solution is acidic.
b
The pH of the solution is 13.3 and the solution is acidic.
c
The pH of the solution is 13.3 and the solution is basic.
d
The pH of the solution is 2.7 and the solution is basic.
Answer:
Option A, The pH of the solution is 2.7 and the solution is acidic
Explanation:
As we know,
pH = - log [H3O+]
Substituting the given values, we get
pH = - log [2.1 x 10-3 M]
pH = - (-2.678)
pH = 2.678 or 2.7
The solution is acidic as pH value is less than 7
Hence, option A is correct
What is the pH of a solution with a hydrogen ion concentration of 1.3X10^-11?
-11.1
-0.11
-10.9
-1.3
Answer:
11,1
Explanation:
-log(1.3x10^-11)
The pH of a solution with a hydrogen ion concentration of 1.3X10^-11 is -11.1. Therefore, option A is correct.
What do you mean by the pH ?The potential of hydrogen ion concentration is referred to as pH. a way to gauge how basic or acidic a material is. The pH scale represents from 0 to 14.
A pH value of 7 is considered neutral on this scale, which implies it is neither acidic nor basic. It is more than acidic if the pH value is below seven, and more basic if the pH value is above seven.
The pH can control the presence of nutrients, biological processes, microbial activity, and chemical behaviour.
Given:
Hydrogen ion concentration = 1.3X10^-11
pH = -log [H+]
pH = -log(1.3x10^-11)
pH = -11.1
Thus,-11.1 is the pH of a solution with a hydrogen ion concentration of 1.3X10^-11, option A is correct.
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if you were conducting an experiment with pepsin which has an optimal enzymatic actigity at ph 2.3, wat buffer would be the best choice
Answer: One with a pKa of 1.9
Hope this helps <3
P.S Fun Fact~~
There are only two words in the English language that have all five vowels in order: "abstemious" and "facetious."!
Answer:
Explanation: Is there choises? H3PO4 / NaH2PO4 buffer with equal concentrations would form a buffer solution pH = 2.15
1. How did the change of stress (adding or removing reactants or products) cause a shift in the equilibrium system of your solutions? Use data to support your answer. Make sure you discuss all four stress changes: a. Adding a reactant b. Adding a product c. Removing a reactant d. Removing a product
Answer:
If reactant or product is removed, the equilibrium shifts to make more reactant or product, respectively, to make up for the loss.
If the reactant or product is removed, the equilibrium shifts to make more reactant or product, to make up for the loss.
Which or the following will most likely happen if the pancreas does not produce sufficient insulin?
Answer:
C. Blood sugar increases b/c insulin lowers blood sugar when it rises too high
Explanation:
Insulin is highly needed by body to regular sugar levels (primarily to lower it when sugar levels rise up). I remember it like this "in" sulin means this hormones "pushes" the sugar inside the cells so that sugar level in the blood comes back to normal.
Therefore, if there is not enough insulin produced by pancreas, blood sugars will rise which can be fatal. That's why some diabetic patients take insulin shots to regulate their blood glucose levels.
What is the colour change when universal indicator is added to a solution containing potassium
in water?
Answer:. Dark purple
(b). Orange yellow
(c). Red
Explanation:
Which of these is NOT a producer in the coral reef ecosystem? *
1. phytoplankton
2. sea grass
3. microalgae
4. coral
Answer:
option number 4. 'coral'
Explanation:
-
How many liters of wine can be held in a wine barrel whose capacity is 22.0 gal?
Question 2 options:
0.172 L
5.81 L
5810 L
83.3 L
0.000172 L
Answer:
83.3 L
Explanation:
Step 1: Given data
Capacity of the wine barrel (V): 22.0 gal
Step 2: Calculate how many liters of wine can be held in the barrel
To calculate the number of liters of wine that can be held in the barrel, we need to convert 22.0 gal to liters. We will use the conversion factor 1 gal = 3.79 L.
22.0 gal × 3.79 L/1 gal = 83.3 L
In a calorimeter that contains water and an unknown metal, 100 grams of water
absorbs 4562.3 J of heat energy. How much heat energy does 15 grams of the metal
transfer to the water
a 4562.4 j
b 68434.5 j
c not enough info given
d 5244.5
1) If a chemist has a 5.50 M solution of HCl, how many mL of acid will they need to add to how many mL of water in order to create 20.0 mL of 1.5 M HCl
Answer:
5.4 mL of acid need to be added to 14.6 mL of water.
Explanation:
We can calculate how many mL of acid are needed by using the C₁V₁=C₂V₂ formula:
5.50 M * V₁ = 1.5 M * 20.0 mLV₁ = 5.4 mLThen we calculate how many mL of water have to be added in order to reach 20.0 mL:
20.0 mL - 5.4 mL = 14.6 mLThus, 5.4 mL of acid need to be added to 14.6 mL of water.
Why is carbon used to date things that were once living?
A. Carbon is not toxic to living things.
B. The half-life of carbon depends on age.
C. The amount of carbon is easy to measure.
D. Living things take in carbon from food.
Answer:
a - carbon is not toxic to living things
Explanation:
The reason carbon dating works is that the fresh carbon-14 gets mixed in with the rest of the carbon in the atmosphere and, since it's chemically identical to regular carbon, gets worked into whatever is presently absorbing atmospheric carbon
What kind of phase transition will occur when energy is continuously supplied to a solid sample?
A. Freezing
B. Ionization
C. Melting
D. Evaporation
Answer:
melting
its true believe it you sheep
How much energy is required to vaporize 2 kg of copper? Use the table below
and this equation: Q = mLvapor-
Answer:
9460 kj
Explanation:
just did it
A metal has a mass of 35.4 g and volume 3.11 ml. Find the density of this metal
Answer:
11.4
Explanation:
Density = Mass / Volume
Density = 35.4 / 3.11
Density = 11.38263666
As there are more number of digits after the decimal, you can round it to 3 significant figure.
Now, your value will be:
Density = 11.4
Measure the initial temperature of the water to the nearest 0.1°C. Record in the data table.
Initial Temp. of Metal
Initial Temp. of water
Initial Temp. of Both
Subtract to find the temperature changes for the water and the metal
Water
Metal
The heat capacity of the metal is calculated using the formula:
Heat capacity = quantity of heat/(mass * temperature difference)What is temperature?
The temperature of a substance is the degree of hotness or coldness of that substance.
Temperature difference between substances enables heat flow.
Heat flows from hot to cold bodies.
In the given experiment, to determine the heat capacity of a metal, the temperature difference is obtained by substracting the initial and final temperatures.
The heat capacity of the metal is then calculated using the formula:
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200 grams of iron (III) chloride reacts with ammonium carbonate [(NH4)2CO3] in the following equation.
FeCl3 + (NH4)2CO3 ---------> NH4Cl + Fe2(CO3)3
_ mole(s) of iron (III) carbonate [Fe2CO3)3] is/are produced in the balanced equation.
a
4
b
1
c
3
d
2
Answer:
0.616 moles of Fe₂(CO₃)₃ are produced when 200 g of FeCl₃ react
b. 1.
Explanation:
The balanced reaction is:
2FeCl₃ + 3(NH₄)₂CO₃ → 6NH₄Cl + Fe₂(CO₃)₃First we convert 200 grams of FeCl₃ into moles, using its molar mass:
200 g ÷ 162.2 g/mol = 1.23 mol FeCl₃Then we convert 1.23 moles of FeCl₃ into moles of Fe₂(CO₃)₃, using the stoichiometric coefficients of the balanced reaction:
1.23 mol FeCl₃ * [tex]\frac{1molFe_2(CO_3)_3}{2molFeCl_3}[/tex] = 0.616 mol Fe₂(CO₃)₃The closest answer would be option b. 1.
Explanation:
[tex]FeCl₃ + (NH₄)₂CO₃ → NH₄Cl + Fe₂(CO₃)₃[/tex]
first balance the chemical equation
[tex]2FeCl₃ + 3(NH₄)₂CO₃ → 6NH₄Cl + Fe₂(CO₃)₃[/tex]
2 mole. 3 mole. 6mole. 1mole
2*162g of FeCl₃ produce 236 g of Fe₂(CO₃)₃
200g of of FeCl₃
produce 236/(2*162)*20=145.68 g of Fe₂(CO₃)₃
1 mole of Fe₂(CO₃)₃=236g
145.68g of Fe₂(CO₃)=1/236*145.68=}0.61mole
closest answer is b 1
b.1mole(s) of iron (III) carbonate [Fe2CO3)3] is/are produced in the balanced equation
What is the specific heat of a metal if 17.5 g metal has a temperature increase of 26.8 °C when 570.4J of energy are added to it?
Answer:
1.22 J/g.°C
Explanation:
Step 1: Given data
Mass of the metal (m): 17.5 gTemperature increase (ΔT): 26.8 °CAdded energy (Q): 570.4 JStep 2: Calculate the specific heat of the metal (c)
A metal absorbs heat and, as a consequence, its temperature increases. We can calculate its specific heat using the following expression.
c = Q / m × ΔT
c = 570.4 J / 17.5 g × 26.8 °C = 1.22 J/g.°C
Which is a fossil fuel?
O A. Coal
O B. Biomass
O C. Geothermal
O D. Nuclear
Answer:
coal
Explanation:
fossil fuels are formed by natural process.
Coal is the fossil fuel. A is correct.
Fossil fuels are non renewable source of energy that means once they get finished we will not be able to use them. Hence it is very important for us to find an alternate like a renewable source of energy like sunlight so that we will not have to depend on these fossil fuels and will not have to tolerate the pollution happening by them as well.
Given options are-
A. Coal
B. Biomass
C. Geothermal
D. Nuclear
Therefore, Coal is the fossil fuel. A is correct.
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An aqueous solution contains 0.30 M potassium cyanide. One liter of this solution could be converted into a buffer by the addition of:
Answer:
Hydrocyanic acid, HCN.
Explanation:
A buffer is defined as the aqueous mixture of a weak acid and its conjugate base. Or a weak base and its conjugate acid. In the problem, we have a solution of potassium cyanide. The conjugate acid of potassium cyanide is hydrocyanic acid. A weak acid with pKa = 9.89.
That means, to convert the solution into a buffer we must add:
Hydrocyanic acid, HCN.define photo electric effect
Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
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Which area of chemistry best links the use of titanium and plastics in artificial bone and joint replacements?
A) environmental chemistry
B) materials chemistry
C) agricultural chemistry
D) physical chemistry
Answer:I think it’s material chemistry
Explanation:
Answer:
Material chemistry.
Explanation:
Artificial bone and joint replacements is not environmental, it does not have anything to do with farming or such things, and physical chemistry has to do with chemical reactions which is not going on. This leaves materials chemistry.
which is best illustrated by Watson and Crick's ball and stick model of dna
Answer:
Here is your Answer.......
Explanation:
The Watson and Crick's ball-and-stick model of DNA best illustrates the role of creativity in scientific discovery
Which of the following is the correct set up AND answer to convert 6.25 x
1032 atoms of Copper to grams of Copper?
Answer:
Explanation:
How many mols do you have?
1 mol = 6.02 * 10^23 atoms
x mol = 6.25 * 10 ^32 atoms
1/x = 6.02*10^23 / 6.25 * 10^32 Cross multiply
6.02 * 10^23 * x = 1 * 6.25 * 10^32 Divide by 6.02 * 10^23
x = 6.25 * 10*32/ 6.02 ^10^23
x = 1.038 * 10^9 mols which is quite large.
Find the number of grams. (Use the value for copper on your periodic table. I will just use an approximate number.)\
1 mol of copper = 63 grams.
1.038 * 10^9 mols of copper = x
1/1.038 * 10^9 = 63/x Cross multiply
x = 1.038 * 10^9 * 63
x = 6.54 * 10^10 grams of copper.