Answer:
Explanation:
Becasue to mqk esure of your studies
What is the pH when the hydrogen ion concentration is 1 x 10-3 M?
O a. 3.3
O b. 4
O c. 2.7
O d. 2
O e. 3
Answer:
e. 3
Explanation:
In order to solve this problem we need to keep in mind the definition of pH:
pH = -log[H⁺]As stated by the problem, the hydrogen ion concentration, [H⁺], is 1x10⁻³ M.
As all required information is available, we now can calculate the pH:
pH = -log(1x10⁻³ M)pH = 3The correct option is thus e.
Matter is never created or destroyed.
Lesson 5.04
Question 7 options:
True
False
Rachard is studying a sample of a substance. The sample is in a large, triangle-shaped flask. Rachard moves the sample to a small, rectangular container. Both containers are closed. Below is an image of the containers used by Rachard. She notices that the shape and the volume of the substance both change when the sample is moved. In which state of matter is the substance?
This is an riddle.
I’m lighter than what I am made of and more of me is hidden than is seen. What am I?
Whoever answers correctly gets brainly.
Answer: The answer is Iceberg
Answer:
Is it an iceberg?
Explanation:
it floats in water
and you can only see the tip of an iceberg
Hope this helps! :)
Have a great weekend!!
How many grams of KNO3 must be dissolved to
create 7.25L a 0.200M solution?
Answer:
146.6 g
Explanation:
First we calculate how many KNO₃ moles are there in 7.25 L of a 0.200 M solution, using the definition of molarity:
Molarity = moles / litersMolarity * liters = moles0.200 M * 7.25 L = 1.45 molesThen we convert 1.45 moles of KNO₃ into grams, using its molar mass:
1.45 mol * 101.103 g/mol = 146.6 gFill in the blank: The bonds in an ionic compound________
electrons.
Answer:
Ionic bonding is the complete transfer of valence electron
Explanation:
In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
how can we reduce air pollution
Answer:Ways to Reduce Air Pollution
Riding a bike or walking instead of driving.
Taking a bus or carpooling.
Buying a car that has greater fuel efficiency.
Turning off lights and appliances when they are not in use.
Using energy efficient light bulbs and appliances.
Buying fewer things that are manufactured using fossil fuels.
Explanation: no explanation
The density of a 25.0% HCl solution (by mass) is 1.05 g/mL, what is the molality of the solution?
(MW HCI: 36.46g/mol, H2O: 18.015g/mol)
a. 9.60 m
b. 6.86 m
c. 7.20 m
d. 9.14 m
e. None of the above
Answer:
[HCl] = 14.7M in HCl
Explanation:
Definition of Molarity (M) = moles solute / Liters of Solution
Given 25.0% HCl (aq) => 25g HCl/100g Solution => ? moles HCl/Liter Solution
Convert 25g HCl to moles = moles solute
moles HCl => moles HCl = 25g HCl / 18.015g HCl/mole HCl = 1.387732 mole HCl = 1.4 moles HCl (2sig.figs.)
Determine Liters of Solution as follows:
Given 25% HCl Solution => 25g HCl/100 g Solution
100 g Solution = (100 g solution) / (1.05 g Solution/ml Solution )
= 95.2381 ml Solution x 1 Liter Solution/1000 ml Solution
= 0.0952 Liters Solution
Apply above mole and volume data to definition of mole.
∴Molarity = moles solute / Liters solution
= 1.4 moles solute (HCl)/0.0952 L solution
= 14.7 Molar in HCl(aq)
Hello I need help please
Answer:
The concentration of an acid in a solution can be determined by making an acid-base titration. To do this, a known volume of the acid solution is gradually added alkali solution whose concentration is known, until a neutral pH is reached.
Explanation:
it refers to the length of the entire path the object travelled
Answer:
Path length is the overall distance traveled following the path of where the object travel. ... Displacement is the distance from the starting point of the object to its final point irregardless where it travels.
Draw the most stable form of the organic products formed in the reaction of ethyl acetate and ethyl benzoate. Ethanol can be excluded from the answer.
Answer:
Please find the solution in the attached file.
Explanation:
Will Mark Brainliest.
1. Analysis of a hydrate of iron(III) chloride revealed that in a 10.00g sample of hydrate, 6.00 g is anhydrous iron(III) chloride and 4.00 g is water. Determine the formula and the name of the hydrate.
Answer:
FeCl₃ . 6H₂O, BRAINLIST PLZ
Explanation:
1) The chemical formula of iron(III) chloride is FeCl₃ (the oxidation number of Fe is 3+, and the oxidation number of Cl is 1-).
2) The formula that you are lookin for the hydrate is of the type FeCl₃ . n H₂O, where n is the number of water molecules per each unit formula of Fe₂O₃.
3) Find the mass of anhydrous FeCl₃ by difference:
mass of FeCl₃ = mass of the sample - mass of the water in the sample
mass of FeCl₃ = 5.49g - 2.20 g = 3.29 g
4) Convert the mass of FeCl₃ in number of moles
number of moles = mass in grams / molar mass
molar mass of FeCl₃ = 55.845 g/mol + 3×35.453 g/mol = 162.204 g/mol
number of moles = 3.29 g / 162.204 g/mol = 0.0203 mol FeCl₃
5) Convert the mass of water in number of moles:
molar mass of water = 18.015 g/mol
number of moles of water = mass in grams / molar mass = 2.20 g / 18.015 g/mol = 0.122 moles H₂O
6) Find the mole ratio of water to iron chloride:
0.122 mol water / 0.0203 mol iron chloride = 6.01 ≈ 6
Therefore, the complete formula of the hydrate is FeCl₃ . 6H₂O,
What are the characteristics of acids and bases, and some examples of each? (20%)
Answer:
Acid :
1) they are sour in taste
2) if we put litmus paper in an acid they turn blue litmus to red and ( red litmus paper colour doesn't change )
3) acids use to react with metals
4) it releases hydrogen (H+) when dissolved in water
5) example : Hydrochloric acid , sulphuric acid , nitric acid etc..
base :
1) they are bitter in taste
2) and the red litmus paper trunes to blue and ( red litmus paper colour doesn't change )
3) it doesn't react with metals
4) it releases hydroxide (OH+) when dissolved in water
5 example : sodium hydroxide, potassium hydroxide etc...
When CO2(g) is put in a sealed container at 730 K and a pressure of 10.0 atm and is heated to 1420 K , the pressure rises to 24.1 atm . Some of the CO2 decomposes to CO and O2.
Calculate the mole percent of CO2 that decomposes.
Express your answer using two significant figures.
Answer:
48%
Explanation:
Based on Gay-Lussac's law, the pressure is directly proportional to the temperature. To solve this question we must assume the temperature increases and all CO2 remains without reaction. The equation is:
P1T2 = P2T1
Where Pis pressure and T absolute temperature of 1, initial state and 2, final state of the gas:
P1 = 10.0atm
T2 = 1420K
P2 = ?
T1 = 730K
P2 = 10.0atm*1420K / 730K
P2 = 19.45 atm
The CO2 reacts as follows:
2CO2 → 2CO+ O2
Where 2 moles of gas react producing 3 moles of gas
Assuming the 100% of CO2 react, the pressure will be:
19.45atm * (3mol / 2mol) = 29.175atm
As the pressure rises just to 24.1atm the moles that react are:
24.1atm * (2mol / 19.45atm) = 2.48 moles of gas are present
The increase in moles is of 0.48 moles, a 100% express an increase of 1mol. The mole percent that descomposes is:
0.48mol / 1mol * 100 = 48%
Experiment 41 Advance Study Assignment: Preparation of Aspirin 1. Calculate the theoretical yield of aspirin to be obtained in this experiment, starting with 2.0 g of salicylic acid and 5.0 mL of acetic anhydride (density
Answer:
The theoretical yield of aspirin is 2.61g
Explanation:
The balanced equation is
Salicylic acid + Acetic anhydride ---> Acetylsalicylic acid + Acetic acid
Number of moles salicylic acid = (2.0g) / (138 g/mol) = 0.0145 mol
Mass of acetic anhydride = (1.08g/ml ) * (5.0 mL) = 5.4g
Number of moles of acetic anhydride = 5.4g / (102g/mol) = 0.0529 mol
As we can see in the reaction equation
1 mol of acetic anhydride produce 1 mol aspirin
OR
0.0145 mol salicylic acid produces 0.0145 mol aspirin.
Mass of aspirin produced = 0.0145 mol * (180.157g/mol)
The theoretical yield of aspirin is 2.61g
How many hydrogen atoms are in 89.5 g of
C6H6 ?
Answer in units of atoms.
Solution :
Molar mass of [tex]C_6H_6[/tex] is :
M = 6×12 + 6×1 g
M = 78 g
78 gram of [tex]C_6H_6[/tex] contains [tex]6.022 \times 10^{23}[/tex] molecules.
So, 89.5 gram of [tex]C_6H_6[/tex] contains :
[tex]n = 6.022 \times 10^{23} \times \dfrac{89.5}{78}\\\\n = 6.91 \times 10^{23}[/tex]
Now, from the formula we can see that one molecule of [tex]C_6H_6[/tex] contains 2 hydrogen atom . So, number of hydrogen atom are :
[tex]h = 2\times 6.91 \times 10^{23}\\\\h = 1.38 \times 10^{22}\ atoms[/tex]
Hence, this is the required solution.
Which statement about the half-life of a radioactive sample is true?
A. It is an exact measure of the decay of an individual atom.
B. It measures the tendency of a radioisotope to decay radioactively.
C. It is affected by the concentration of the radioactive substance that is present.
D. It can be calculated based on neutron number.
Answer:
The correct answer is - B. It measures the tendency of a radioisotope to decay radioactively.
Explanation:
The half-life of the radioactive sample is the time it takes to decay to its half amount of the unstable nuclei of its initial amount. It is radioactively decays to its half value or in simple words, it takes the time to decay an unstable nuclei to decay to its half value.
It can take milliseconds to million years to disintegrate the different unstable nuclei of a radioactive substance to disintegrate its half amount to a stable substance.
Answer:
B. It measures the tendency of a radioisotope to decay radioactively.
Explanation:
Chem Hnrs EDGE 2021
An empirical formula calculation gives a molar ratio of 1.0 oxygen, 4.8 hydrogen, 4.1 carbon and 1.8 nitrogen. If the molecular mass is approximately 200 amu, what is the molecular formula
Answer:
[tex]C_8H_{10}O_2N_4[/tex]
Explanation:
Hello there!
In this case, according to the given information about the empirical formula of this compound, we can infer that these mole ratios can be rounded to the following whole numbers in order to find the empirical formula:
[tex]C_4H_5ON_2[/tex]
Whose molar mass is 97.09 amu and thus, the ratio of the molecular to the empirical molar mass is:
[tex]200/97.09=2.1[/tex]
Which is almost a factor of 2; and therefore, the resulting molecular formula is:
[tex]C_8H_{10}O_2N_4[/tex]
Regards!
A student is creating a model of space and wants to include the Earth, the Milky Way galaxy, the universe, and the
solar system. How should the student scale the components of the model to make an accurate model? Select the
FOUR statements that apply.
A)
The universe should be the largest component of the model.
B)
The Earth should be a smaller component within the solar system.
C)
The solar system should be scaled smaller than the Milky Way galaxy.
D)
The solar system should be larger than the Earth but not larger than the
Milky Way
E)
The Milky Way should be larger than the Earth but smaller than the solar
system.
Answer:
the solar system should be larger than earth but not larger than the milky way
The universe is made of billions of galaxies, stars, planets, satellites of these planets dark matter and other small objects. Universe being the largest in the model and then milky galaxy in which the solar system is one component and the smallest in the model is earth.
What is galaxy?Galaxy is a group of stars, dust and dark matter connected with a gravitation pull. The Universe is made of billions of galaxies in which the one which is near to the earth is called milky-way.
There are number of planets in the universe and some of them are not identified yet. The solar system is a group of planets which revolving around the sun.
Earth is one planet in the solar system. Galaxies are bigger than solar system. Thus in the model earth being the smaller component and solar system smaller than milky way.
Universe be the largest in this model containing all these galaxies, solar system and planets. Hence the options A, B,C and D are correct.
To find more about galaxies, refer the link below:
https://brainly.com/question/24836631
#SPJ2
A solution of carbon tetrachloride and acetic acid (CH3COOH) that is 50% carbon tetrachloride by mass is boiling at 98.6 °C. The vapor is collected and cooled until it condenses to form a new solution. Calculate the percent by mass of carbon tetrachloride in the new solution.
Answer:
The percent by mass of carbon tetrachloride in the new solution is 72.6
Explanation:
Molecular weight of Carbon Tetrachloride is 154 g/mol
Molecular weight of CH3COOH is 60g/mol
Mass fraction of CCl4 is 0.5
Mass fraction of CCl4 is (0.5/154)/{(0.5/154) + (0.5/60)}
Mass fraction of CCl4 is X = 0.2803 and Y = 1-X
As per Raoul’s law
Y Pt = X * P1
Pt = X * P1 + YP2
Pt = 0.2803 * 1377 + (1-0.2803) * 519
Pt = 759.557 torr
Substituting the given values we get
Y1 = X1P1/Pt
Y1 = 0.2803 * 1377/759.557
Y1 = 0.508
Mass fraction
(0.508)(154)/{( (0.508)(154)) + (1-0.508)(60)}
= 0.726 = 72.6 %
2.Sodium hydroxide reacts with hydrochloric acid. NaOH(aq) HCl(aq) ----> NaCl(aq) H2O A Flask contains 20.00 mL of 0.1030 M HCl. What volume of 0.2010 M NaOH must be added to just neutralize the acid
If 50mL of 0.15M calcium sulfide is added to 30mL of 0.35M ammonium carbonate, how many grams of precipitate will form
Answer:
0.750 g
Explanation:
The reaction that takes place is:
CaS (aq) + (NH₄)₂CO₃ (aq) → CaCO₃ (s) + (NH₄)₂S (aq)First we calculate how many moles of each reactant were added, using the given volumes and concentrations:
CaS ⇒ 50 mL * 0.15 M = 7.5 mmol CaS(NH₄)₂CO₃ ⇒ 30 mL * 0.35 M = 10.5 mmol (NH₄)₂CO₃Given that they react in a 1:1 ratio, and that there are less CaS moles than (NH₄)₂CO₃ moles, CaS is the limiting reactant.
7.5 mmoles of CaS will produce 7.5 mmoles of CaCO₃.We now convert 7.5 mmol CaCO₃ into mg, using its molar mass:
7.5 mmol * 100 mg/mmol = 750 mgFinally we convert 750 mg to g:
750 mg / 1000 = 0.750 gWhich type of fuel uses combustion to produce energy?
O A. Hydroelectric
B. Nuclear
O C. Biomass
D. Geothermal
Answer:
nuclear im not sure but the chances of the answer getting correct is high
How many hydrogen atoms are present in 3.42 kg of C3H7NH2(l)?
Answer:
Explanation:
From the given information:
mass = 3.42 kg = 3420 g
molar mass of [tex]C_3H_7NH_2[/tex] = 59 g
Number of moles of [tex]C_3H_7NH_2 = \dfrac{mass (in gram) }{molar mass}[/tex]
Number of moles of [tex]C_3H_7NH_2 = \dfrac{3420 \ g }{59 \ g}[/tex]
= 57.966
number of hydrogen atoms present = [tex]n \times N_A[/tex]
where;
[tex]N_A = avogadro's \ constant = 6.022 \times 10^{23}[/tex]
number of hydrogen atoms present [tex]=9 \times 57.966 \imes 6.022 \times 10^{23}[/tex]
[tex]\mathbf{= 3.14 \times 10^{26}}[/tex]
What is the value of delta G at 292 for a reaction in which deltaH = 92 kj/mol and delta S= 2.38 kj/mol K
Answer: The value of [tex]\Delta G[/tex] is -602.96 kJ/mol at 292 k for a reaction in which [tex]\Delta H[/tex] = 92 kj/mol and [tex]\Delta S[/tex] = 2.38 kj/mol K.
Explanation:
Given: Temperature = 292 K
[tex]\Delta H[/tex] = 92 kJ/mol
[tex]\Delta S[/tex] = 2.38 kJ/mol
Formula used to calculate the value of [tex]\Delta G[/tex] is as follows.
[tex]\Delta G = \Delta H - T\Delta S[/tex]
Substitute the values into above formula as follows.
[tex]\Delta G = \Delta H - T\Delta S\\= 92 kJ/mol - (292 K \times 2.38 kJ/mol K)\\= 92 kJ/mol - 694.96 kJ/mol\\= - 602.96 kJ/mol[/tex]
Thus, we can conclude that the value of [tex]\Delta G[/tex] is -602.96 kJ/mol at 292 k for a reaction in which [tex]\Delta H[/tex] = 92 kj/mol and [tex]\Delta S[/tex] = 2.38 kj/mol K.
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Explanation:
Simply multiply the # of moles of O2 by a molar ratio to give the # of moles of MgO:
#moles O2 × (2 mol MgO/1 mol O2) = # moles of MgO
where the quantity inside the parenthesis is the molar ratio between MgO and O2.
What is metal's state memory?
structural formula for alkene with double bond st carbon 2 that shows no trans -cis isomerism C6H12
Answer:
Explanation:
Read up on this:
https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_The_Basics_of_GOB_Chemistry_(Ball_et_al.)/13%3A_Unsaturated_and_Aromatic_Hydrocarbons/13.02%3A_Cis-Trans_Isomers_(Geometric_Isomers)
I think the answer is going to structure of 2-methyl-2-pentene.
If 45.6 g of Fe2O3 reacts with excess water, how much heat is required?
Explanation:
I
have not yet learnt chemistry so sorry
Answer:
350
Explanation:
The diameter of a circle is 17 cm. Find its circumference in terms of \piπ.
Answer: sorry I didnt know the answer it wont let me get off
Explanation: