Answer:
The molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution. To calculate the molarity of a solution, you divide the moles of solute by the volume of the solution expressed in liters.
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.
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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How does the rate of formation of o2 compared with the rate of formation of h2o and the rate of hydrogen peroxide consumption
The rate of formation of water and the decomposition of hydrogen peroxide is double as compared to rate of formation of oxygen.
What is chemical reaction?The chemical reaction is given as the reaction of the reactants in the process to form the new compound.
The chemical reaction with the decomposition of hydrogen peroxide is:
[tex]\rm 2\;H_2O_2\;\rightarrow 2\;H_2O\;+\;O_2[/tex]
The rate of formation of water is given to be double the rate of formation of oxygen as 2 moles of water formed with 1 mole of oxygen.
The rate of disappearance of hydrogen peroxide is double with formation of oxygen as for decomposition of 2 moles of hydrogen peroxide, 1 mole of oxygen is formed.
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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
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.
Please look at image. the green colored blocks indicate the..
A. alkali metals
B. alkaline metals
C. noble gases
D. halogens
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.
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
For which part of the engineering process would the use of statistics to
analyze data about a new drug test be helpful?
O A. Making a plan
a
B. Identifying a need
O C. Testing the solution
D. Evaluating the results
Answer:
D
Explanation:
While evaluating you will notice if it works or not
100 POINTS!!!
What coefficient must I add to the product to balance the following equation?
La2O3 + 3H2O --> La(OH)3
A: 2
B: 3
C: 1
D: it is balanced as it
Coefficient A: 2 must be added to the product to balance the equation.
What is a chemical equation?a chemical equation is a representation of elements taking part in chemical reactions.in a chemical reaction, all elements are written with their physical state.Law of a chemical equationThe mass of the reactant side is always equal to the mass of the reactant side.
To balance the chemical equation coefficient is added to make the number of atoms equal on both sides.
La₂O₃+ 3H₂O => 2La(OH)₃
Left-hand side of atoms is equal to right-hand side La=2
O=6
H =6
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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
Which factor helped to first drive plants to live on land?
greater access to sunlight on land
lack of competition in the water
greater access to water on land
lack of turgor pressure in the water
A factor which helped to first drive plants to live on land is: A. greater access to sunlight on land.
The chemical reaction for photosynthesis.In Science, photosynthesis is a light-dependent process and it is typically represented by the following chemical reaction:
Carbon dioxide + water + light energy ⇒ sugar + oxygen
Based on the chemical reaction above, we can infer and logically deduce that light energy (sunlight) obtained from the Sun is a very important factor for photosynthesis.
Consequently, greater access to sunlight on land became a factor which helped to first drive plants to live on land.
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Answer:
it is A step by step
Explanation:
I will give Brain list and lot of points
Answer: gugygy
Explanation:
How is star stuff connected to the sun?
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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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?
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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A solution has a [OH-] of 1 x 10^-12 M. What is the [H3O+] of the solution?
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.
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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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:
What is the mass percent when 96 grams of NaCl is dissolved in 255 grams of water
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
A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. which is the symbol of this nuclide? superscript 19 subscript 21 upper k. superscript 21 subscript 19 upper k. superscript 40 subscript 19 upper k. superscript 19 subscript 40 upper k.
The symbol of the radioactive nuclide given the data is superscript 40 subscript 19 upper K (⁴⁰₁₉K)
Composition of atomsAn atom is composed of sub-particles which include
Proton Neutron Electron How to represent an atomThe symbol of an atom showing its atomic number and molar mass can be represented as follow
ⁿₓA
Where
n is the mass number x is the atomic number A is the symbol How to represent the symbol of the nuclei Mass number (n) = 40Atomic number (x) = 19Symbol (A) = K Representation =.?ⁿₓA => ⁴⁰₁₉K
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Answer:
c
Explanation:
edge
(C=12.01 amu, H=1.008 amu, O=16.00 amu)
[?] g/mol CH20
CH₂O = C + 2.H + O
= 12.01 + 2 x 1.008 + 16
= 30.026 amu = 30.026 g/mol
Lake Michigan holds 1.3 x 1015 gallons of water. If just Chicago removed water from the
lake and it never rained again, how many days would the water last? Chicago uses 1.2 x 109
gallons of water /day
1,300,000,000,000,000 gallons
Show work
1.3 x 10¹⁵ : 1.2 x 10⁹ = 1.083 x 10⁶
Answer:
1.3x 10 15 gallons of water / 1.2x 10 9 gallons/day=
1.1x 10 6 gallons/day
Explanation:
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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Find the number of CoCl2 units present in a 0.78 mol sample.
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Here we go ~
1 mole of [tex] \sf{ COCl_2} [/tex] has 6.022 × 10²³ molecules of the given compound.
So, 0.78 mole of [tex] \sf{COCl_2} [/tex] will have ~
[tex]\qquad \sf \dashrightarrow \: 0.78 \times 6.022 \times 10 {}^{23} [/tex]
[tex]\qquad \sf \dashrightarrow \: \approx4.7 \times 10 {}^{23} \: \: \: molecules[/tex]
