Answer:
KOH molar mass = 39 + 16 + 1 = 56g
To make 1 L of 1M soln needs 56g KOH
To make 500mL 1M needs 56/2 = 28g
To make 500mL 0.2M needs 28 x 0.2gn:
CAN SOMEONE PLEASE HELP ME I would appreciate it so much
Lab:Charles Law Data
If 1.0 mol of N2 and 3.0 mol of H2 in a closed container initially at STP react completely in the reaction shown below, then the final pressure in the flask will be ________ atm at 273 K.
Answer:
[tex]p_f=0.5atm[/tex]
Explanation:
Hello!
In this case, since the reaction between nitrogen and hydrogen produces ammonia:
[tex]N_2+3H_2\rightarrow 2NH_3[/tex]
We can compute the volume of the container by using the ideal gas law at STP (1 atm and 273.15 K):
[tex]V=\frac{4.0mol*0.08206\frac{atm*L}{mol*K}*273.15K}{1atm}=89.7L[/tex]
Next, since nitrogen and hydrogen are in a 1:3 mole ratio, we understand all the nitrogen and hydrogen are consumed and only ammonia remains at the end of the reaction in the following amount:
[tex]n_{NH_3}=1.0molN_2*\frac{2molNH_3}{1molN_2} =2.0molNH_3[/tex]
Thus, the final pressure turns out:
[tex]p_f=\frac{2.0mol*0.08206\frac{atm*L}{mol*K}*273.15K}{89.7L}\\\\p_f=0.5atm[/tex]
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How many grams of KOH are required to prepare 500. mL of 0.450 KOH solution?
Answer:
KOH molar mass = 39 + 16 + 1 = 56g
To make 1 L of 1M soln needs 56g KOH
To make 500mL 1M needs 56/2 = 28g
To make 500mL 0.2M needs 28 x 0.2gn:
Explanation:
The weight of KOH are required to prepare 500. mL of 0.450 KOH solution is 12.6 gm
What is Molarity ?Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol/dm³ in SI unit.
Molar mass of KOH = 39 + 16 + 1 = 56g
To make 1 L of 1M soln needs = 56g KOH
To make 500mL 1M needs 56/2 = 28g
To make 500mL 0.450 M needs = 28 x 0.450
= 12.6 gm
Therefore, The weight of KOH are required to prepare 500. mL of 0.450 KOH solution is 12.6 gm.
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An atom is defined as the smallest part of an element that...?
Answer:
takes part in a chemical reaction
Explanation:
An atom is defined as the smallest part of an element that takes part in a chemical reaction.
When chemicals react, they simply exchange their atoms and recombine to form compounds where the atoms inside of them have a stable configuration.
In a chemical reaction, atoms are not broken down to simpler forms. Chemical reactions do now break down atoms. By losing, sharing or gaining of electrons, atoms simply form compounds and molecules.
12. What kind of mixture is formed when oil is mixed with water?
A. Solution B. Water c. colloids D. suspension
Answer:
C. Colloids
Explanation:
Because these two mixtures don't mix
Answer:
D. suspension
Explanation:
I took this assignment the other day and made a 100
Why series fatty acid carbons seen in double from?
For an aqueous solution of sucrose (C12H22O11), determine: (a) the molarity of 3.30 L of a solution that contains 225.0 g of sucrose M (b) the volume of this solution that would contain 4.30 mole of sucrose L (c) the number of moles of sucrose in 1.00 L of this solution mol C12H22O11
Answer:
a) Molarity = 0.199M
b) 21.6L of solution
c) 0.199 moles of sucrose in 1L
Explanation:
a) Molarity is the ratio of moles of solute (sucrose) in volume of solution (3.30L):
Moles sucrose -Molar mass: 342,3g/mol-:
225.0g * (1mol / 342,2965g) = 0.6573 moles
Molarity = 0.6573 moles / 3.30L
Molarity = 0.199Mb) 0.199M means 0.199 moles in 1L. 4.30 moles are in:
4.30 mol * (1L / 0.199mol) = 21.6L of solution
c) By definition, there are 0.199 moles of sucrose in 1L. This is the meaning of 0.199M
HOW TO CALCULATE MOLARITY:
The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume. That is:Molarity (M) = no. of moles ÷ volumeQUESTION A:
Molar mass of C12H22O11 = 342.3 g/molno. of moles = 225g ÷ 342.3g/mol = 0.66molMolarity of sucrose = 0.66mol ÷ 3.30L = 0.2MQUESTION B:
Volume = no. of moles ÷ molarityVolume = 4.30 mol ÷ 0.2M = 21.5LQUESTION C:
no. of moles = molarity × volume no. of moles = 0.2M × 1Lno. of moles = 0.2molLearn more at: https://brainly.com/question/8732513?referrer=searchResults
Type your answer in decimal form. Do not round.
2/5 tons = pounds
When determining a body's mass, the most popular units to employ are pounds (lb) and kilograms (kg). For correct trade, engineering, and scientific study, accurate conversion between these two is therefore crucial. Here 2/5 tons is 881.84 pounds.
Scales are used in numerous ways to determine a body's weight or mass. To measure various items of various sizes, various sorts of scales are utilized. As the measure of an object's weight, pounds are used. In Britain, this style of weighing in pounds is typical. Additionally, it can be written as Lb or Lbs.
Here 1 tons = 2204.62 pounds
Thus 2/5 tons = 2/5 × 2204.62
2/5 tons = 881.84 pounds
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Andy rides a a speed of 8 miles per hour. How far does he ride in 3 hours?
Answer:
The answer is 24 miles.
Explanation:
Every hour he rides 8 hours. If he rides for three hours you can take 8 miles x 3 hours which is 24 miles.
The speed of the riding is 8 miles/hours . Within a time of 3 hours Andy will go for a distance of 24 miles.
What is speed?Speed is a physical quantity which measures the distance covered per unit time. The rate of speed is called velocity both having the units m/s, km/hr, miles/hr etc.
Speed is directly related to the distance covered. As the speed increases, distance covered by the object also increases. Whereas as the time increases, distance covered will decreases.
Given the speed of ride = 8 miles/s
time = 3 hours.
Distance = speed × time.
= 8 miles/ hr × 3 hours
= 24 miles.
Therefore, Andy will reach out a distance of 24 miles within 3 hours when ride with a speed of 8 miles/s.
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at what temp does h2o melt
Answer:
32 degrees fahrenheit
Explanation:
Which three types of reactions yield a product that is a chemically bonded combination of reactants? replacement, polymerization, decomposition polymerization, decomposition, oxidation decomposition, synthesis, replacement oxidation, synthesis, polymerization
Answer:
oxidation, synthesis, polymerization
Explanation: I took the test
The three types of reactions are product that is a chemically bonded combination of reactants are oxidation, synthesis, polymerization
A chemical reaction is often described as when two or three elements are combined together to form a compound. The product of oxidation, synthesis, polymerization are simply said to chemically bonded because they are composed of different reactants (elements) that are combined together to form another.Conclusively, we can therefore say that the three types of reactions are product that is a chemically bonded combination of reactants are oxidation, synthesis, polymerization
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Using your periodic table, determine the electron configuration of Barium ion, Ba+2
Answer:
im pretty sure the electron configuration of the barium ion Ba+2 is [Kr]5s24d105p6
Explanation:
250 ml glass of lemon juice contains 20 grams of sugar. How much sugar is in 500 ml bottle
-flemon juice?
[0.5) * BS
0.5 Points)
There is 40 g of sugar in a 500 ml bottle of lemon juice
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
the concentration of sugar in lemon juice :
[tex]\tt \dfrac{20~g}{250~ml}=0.08~g/ml[/tex]
So for 500 ml juice :
[tex]\tt 500\times 0.08=40~g~sugar[/tex]
Please help, im really confused. ill mark brainliest
Answer:
Fossils of the same animals have been found on South America and on Africa.
Africa and South America look as if they could be fit together perfectly (they almost can!)
Explanation:
Basically, the idea is that South Africa and Africa were once the same landmass. The same animals lived in that landmass, but when they broke off, then the animals were on different continent, yet they came from the same place.
what are tiny cell structures that carry out specific functions within the cell?
Answer: organelles
Explanation:
Similar to the way your stomach, lungs, and heart have different functions in your body, each organelle has a different function within the cell.
Before you can find the mass, what do you need
to know?
Answer:
you need to know what you're finding the mass of.
Explanation:
This is just one example. There are probably more out there, but this is one thing my parents taught me. Hope this helps, and tell me if I'm wrong!
According to Boyle’s law, when the pressure of a gas increases at constant temperature, its volume
Answer:
reduces
Explanation:
According to Boyle's law, when the pressure of a gas increases at constant temperature the volume reduces.
Boyle's law states that "the volume of fixed mass of a gas is inversely proportional to the change in pressure if the temperature is constant".
It suggests that at constant temperature, if pressure increases, temperature reduces.Mathematically, it is expressed as;
P1 V1 = P2 V2
P and V are pressures
1 and 2 are initial and finals state.
Boyle's law is stated for the ideal gas at a constant temperature. According to Boyle's law, with an increase in pressure, the volume of the gas decreases.
What is an ideal gas?The ideal gas is given as the gas in which the interatomic collisions are zero, and the changes are produced with the collisions to the walls.
Boyle's law is stated as the gas is at a constant temperature. According to the ideal gas, the pressure and volume are inversely related.
With the increase in pressure, the volume of the gas decreases and vice versa.
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A scientist wants to determine the best light wavelength for growing plants. He grows plants in four test groups as shown in the table below. What, if anything, was wrong with the experiment? A. He should only grow one plant in each group.
B. He should only change the wavelength of light for each group.
C. He should add a control group with a CO2 level of zero ppm and a light intensity of zero percent.
D. There is nothing wrong with the experiment.
Answer:
where is the table..............
Answer:
B
Explanation:
I just took the test.
Sketch the graph of y = 4 x squared + 32 x + 15 using your graphing calculator. What are the x-intercepts of this graph? a. (-5, 0) and (3.5, 0) c. There are no y-intercepts b. (-2.5, 0) and (-2, 0) d. (-0.5, 0) and (-7.5, 0) Please select the best answer from the choices provided A B C D
Answer: d.) x= -7.5 x= -0.5
Explanation: correct on edge 2021
Si, C, Ni which one is higher in ionization energy?
Answer:
I hope your having a good day, here is the answer to your following question:
C is the most highest energy...i just looked at a Periodic Trends — Ionization Energy
If i get it Right give brainlest
Explanation:
A material that consists of only one type of element or compound.
Answer:
Pure substance
Explanation:
A material that consists of only one type of element or compound is regarded as a pure substance.
A pure substance has the following properties;
All the parts are the same throughout i.e. they are homogenousThey have a definite composition. They cannot easily be separated or broken down into simpler substances by physical means. Separation by physical methods is not easyThey have unique sets of properties.Compounds and elements are pure substances too.
In Rutherford's Gold Foil Experiment, he discovered ? O neutrons O Protons O nucleus O electrons 4 5
Answer:
Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.
Choose the formula for ammonium.
ΝΗ,
b NH3
C
(NH)3N
Answer:
NH4+ will be ammonium, NH3 is ammonia which is the conjugate base of ammonium.
Explanation:
What best describes the reactants and products in a reaction at equilibrium?
more reactants form than products
they form at equal rates
more products form than reactants
they form equal amounts
Answer: they form at equal rates
Explanation:
By definition, at equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction.
Are bonds broken or formed, throughout each phase change present on a heating
curve?
Answer:
sipi
Explanation:
Suppose you are a chemical engineer working with a client who produces toothpaste.The client wants to add a blue stripe with mint flavor to the toothpaste.What questions would you ask to begin to address the design problem?
Answer:
Explanation:
I would ask him why would he want to add the blue stripe?
why would he want to add the blue stripe in tooth paste? I would ask
What is composition of a toothpaste?A toothpaste is composed of many ingredients like surfactants, abrasive agent, thickening agent, flavors, humectants, solvent, buffer, color, fluoride etc.
Surfactant provide foam, helps to spread the toothpaste throughout the mouth, have detergent action, example is sodium lauryl sulphate.
Abrasive agents have cleaning action like calcium carbonate, calcium phosphate etc.
Thickening agents act as a binder which prevent ingredients from spreading include natural gum, seaweed colloids etc.
Humectants helps to retain water which helps the paste to drying out such as glycerol, sorbitol etc.
Solvents act as a carrier of other ingredients of the toothpaste which makes it flowable and provide hydration.
Buffer is added to stop the toothpaste from being acidic such as trisodium phosphate, sodium citrate etc.
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5. Rust (Fe2O3) is produced when iron (Fe) reacts with oxygen (O2). Calculate the number
of grams of rust produced when 12 gram of iron react with oxygen.
Answer:
mole ratio = Fe:O2 = 2 : 3
36 grams of iron = how many moles?
well, 36/56 = 0.64 moles
multiply this by 1.5 =0.96 moles
this * 16 =15.43 grams
According to stoichiometry and balanced chemical equation of iron and oxygen 17.15 g of rust is produced when 12 g iron reacts with oxygen.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
The balanced chemical equation for formation of rust when iron reacts with oxygen is,
4 Fe + 3 O₂[tex]\rightarrow[/tex] 2 Fe₂O₃
223.36 g of iron produces 319.38 g of rust
∴ 12 g iron will produce 12×319.38/223.36= 17.15 g of rust.
Therefore, 17.15 g rust is produced from 12 g iron when it reacts with oxygen.
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What is a male reproductive organ?
Answer:
Organs of the male productive system are the scrotum, spermatic ducts, sex glands, and penis. They coinside to produce sperm, gametes, and semen.
Explanation:
I payed attention in health <3 nah jk I am an expert of all things man
xoxo, your highness...What else is produced during the replacement reaction of silver nitrate and potassium sulfate? 2AgNO3 + K2SO4 Ag2SO4 + ________
Answer:
c
Explanation:
Answer:
c
Explanation:
Hi, I could really use your help. The question is Which of the products would you anticipate being formed in the least molar quantity? That is, which of the products (1, 2, or 3) is the minor product? Explain your choice. HINT: Consider the intermediates formed.
Answer:
Number 1 will be in the lowest molar quantity b/c formation of 1st order products are more difficult to form than secondary (#2) or tertiary (#3) substitution products.
Explanation:
In general, if a substitution occurs such that it is attached to a carbon that's attached to only one carbon, it is referred to as a primary carbon substitution. If a substitution occurs on a carbon that is attached to two (2) carbons, it is a secondary carbon substitution. Finally, if a substitution occurs such that it is attached to a carbon that's attached to three (3) carbons it is a tertiary substitution. Typically, primary substitution products follow an Sn2 type reaction pathway. Such requires the formation of only one intermediate that difficult to form as compared to 2° or 3° intermediates. Once formed, however, they will be very unstable and proceeds to product very quickly. Such produce very low product yield. The intermediates for 2° and 3° form more easily and are more stable in the reaction environments. An example is tertiary butyl halogens (e.g., t-butyl chloride) follow and Sn1 type reaction pathway forming a tertiary carbocation which then reacts with a nucleophile of choice and forms much higher yields than the 1° carbon substitution reactions. Suggest reviewing Sn2 and Sn1 substitution reactions.