Answer:
The reactants and products in a chemical reaction contain the same atoms, but they are rearranged during the reaction. As a result, the atoms end up in different combinations in the products. This makes the products new substances that are chemically different from the reactants.
Explanation:
1A) What is the pH of a solution that was 0.75 M acetic acid? Ka for acetic acid is 1.7x10-5. (Note: 0.75 M is the initial concentration of acetic acid.)
Set up an ICE table for HC2H3O2(aq)+ H2O (l) C2H3O2-(aq) + H3O+(aq). Remember to cross out any solid or liquid compounds.
1B) Plug the “Equilibrium” (E) terms into the Ka expression:
It appears at first as though you will need to use the quadratic formula to solve for x because the numerator is squared and the denominator is not. However, there is a simple trick that can fix the algebra for these problems. Since Ka is so small, it can be assumed that x is also incredibly small. If x is very small, then 0.75-x will effectively remain 0.75. The “rule of 1000” says that as long as the initial concentration of the acid is at least 1000x larger than the Ka, you can make this assumption. 0.75 is 44,000x larger than 1.7x10-5, so the assumption is valid.
1C) Now that you know the equilibrium concentration of H+, calculate the pH.
Answer:
Answer:
4.921.
Explanation:
It is an acidic buffer solution;
∵ pH = pKa + log[salt]/[acid].
∴ pH = - log(1,8 x 10⁻⁵) + log[0.75/0.50] = 4.745 + 0.1761 = 4.921.
Explanation:
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. pH is a unitless quantity. Therefore, the pH of a solution that was 0.75 M acetic acid is 4.921.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
pH of acetic acid= pKa + log[salt]/[acid]
pH of acetic acid = - log(1,8 x 10⁻⁵) + log[0.75/0.50]
= 4.745 + 0.1761
= 4.921
Therefore, the pH of a solution that was 0.75 M acetic acid is 4.921.
To learn more about pH, here:
brainly.com/question/27945512
#SPJ2
Polonium-218 undergoes beta decay, converting a neutron into a proton. Then the daughter isotope undergoes another beta decay, again converting a neutron into a proton. Which equation correctly describes this process? Use the periodic table link from the tools bar to answer the question.
Answer: [tex]^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e[/tex] is the correct equation for beta decay.
Explanation:
When a beta particle, that is, [tex]^{0}_{-1}e[/tex] is emitted in a radioactive decay then it is known as beta decay.
Therefore, beta decay of Polonium-218 is as follows.
[tex]^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e[/tex]
Therefore, we can conclude that [tex]^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e[/tex] is the correct equation for the given beta decay.
Answer:
A
Explanation:
The top dudes answer summed up.
PLEASE HELP I REALLY CANT FAIL THIS. THIS DETERMINS IF I PASS MY GRADE. What are the most basic building blocks of all organisms?
OA.
blood
ОВ.
tissue
OC.
cells
OD
organs
Answer:
Cells are the basic building blocks of living things.
Explanation:
So the answer is cells because it is composed of trillions of cells, all with their own specialised function. Cells are the basic structures of all living organisms.
I hope this helps you pass and humble yourself you will get to it, you got this!!!
Answer:
Cells are the most basic building blocks
Explanation:
Tissues are made out of cells. Organs are made out of tissues.
Li(OH) --> Li2O + H20
Answer:
2Li(OH)-->Li2O+H20
Explanation:
There are 2Li, 2H and 2O on each side
The current model of the atom suggests that ?
Answer:
i dont see the model bro
Explanation:
Answer:
The current model of the atom shows an atom that is mostly empty space. In the center is a small nucleus made of protons and neutrons.
Explanation:
On a distance-time graph, the slope of the line indicates the ________ of the object
Answer:
Speed
Explanation:
On a distance - time graph, the slope of the line indicates the speed of the object.
Speed is the rate of change of distance with time.
Speed = [tex]\frac{distance}{time}[/tex]
Now, the slope is the change in distance with the change time which is commensurate with the speed equation.
For a displacement - time graph, the slope is the velocity.
Therefore the slope of a distance - time graph is its speed.
PLEASE HELPPPPPPPPPPPPPPPP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE LOL
PLEASE WRITE IN YOUR OWN WORDS
1. After your body breaks food down, what are three things that can happen to the atoms from your food? *
2. Would you be able to get energy from food if there weren’t chemical reactions in your body? Why or why not? *
Answer:
1 Once proteins, fats and carbohydrates are digested, absorption takes place in the small intestine.
2 if we eat food we get energy, but if there weren't chemical reaction in your body nothing happens.
Explanation:
1 Most of the digestion occurs in the first part of the small intestine while the absorption of broken down nutrients, water, vitamins, and minerals occurs in the rest of it.
What is the cost in dollars for the nails used to build a fence 80 meters long if it requires 30 nails per meter? There are 40 nails per box at a cost of 75 cents per box
Answer:
4500 cent
Explanation:
From the question, we were told that
a fence 80 meters long requires 30 nails per meter.
1 metre fence = 30 nails
Then 80 meters long= ( 30 × 80)
= 2400 nails
Which means a fence 80 meters long will require 2400 nails in total.
We need to find the cost in dollars for the nails to build a fence 80 meters long.
We know that 40 nails per box will cost 75 cents per box.
(2400 nails/40 nail per box)= 60 box
Then 60 box will be needed to complete the fence.
the cost in dollars for the nails to build a fence 80 meters long= (60 box × 75 cent per box)=4500 cent
In the equation shown, what are the reactant(s)?
CsHot 0,7H2O+CO2
C=1
H = 8 H=2
0 = 2
C=3
O=3
wie
O C3H8
What is the number of electronsin hydrogen
Answer:
There's only one electron in hydrogen.
Answer:
Hydrogen contain 1 electron
Explanation:
Multiple Choice
Over time, a particular plant has developed a longer stamen. Which of the following is a possible advantage of having a longer stamen?
A. A longer stamen could ensure that an insect brushes against an anther and picks up pollen.
B. A longer stamen could ensure that the flower produces more nectar.
C. A longer stamen could ensure that pollen could reach the ovary and fertilize the egg.
D. A longer stamen could ensure that the developing flower is well protected.
Answer:
A) A longer stamen could ensure that an insect brushes against an anther and picks up pollen.
Explanation:
The stamen will provide easier access to the pollen.
Hope this helps :)
If pure argon gas were mixed with pure hydrogen gas would the two elements react with each other?
Answer:
No, the two substances will not react with each other
Explanation:
We already know that argon belongs to group 18 in the periodic table. Members of this group are commonly referred to as noble gases. So, we can say that argon is a noble gas.
One characteristic of noble gases is that they possess a filled outermost shell, they have a complete octet of electrons. As a result of this, they hardly participate in chemical reactions since they have already attained the stability that arises from having a complete octet of electrons.
Hence, argon will not react with hydrogen.
What kinds of shapes can carbon based molecules form?
Answer:
Straight chains, branched chain and rings.
Explanation:
Hope this helps :)
Answer/Explanation:
Carbon based molecules tend to form in chain like patterns. So, carbon molecules could/would form a chain that branches out, a chain that travels in a straight or constant direction, and a chain that connects into a loop style.
Using the balanced chemical equation below. 2Al2O3 --> 4Al + 3O2 How many moles of oxygen are produced if 11.0 mol of Al are produced?
Answer:
8.25 moles of oxygen will be produced.
Explanation:
Given a balanced chemical equation;
2Al₂O₃ ------> 4Al + 3O₂
from the balanced chemical equation above, 3 moles of Oxygen are produced when 4 moles of Aluminum are produced.
4 moles of Al --------> 3 moles of Oxygen
11 moles of Al --------> ?
[tex]= \frac{(3 \ moles \ of \ O_2) \ \times \ (11 \ moles \ of \ Al)}{4 \ moles \ of \ Al} = 8.25 \ moles \ of \ O_2 \\\\[/tex]
Therefore, 8.25 moles of oxygen will be produced.
Please help i'm failing these are three different questions because I got no more points
How does the relative distance and length of year of outer planets compare with those of inner planets?
When compared with inner planets, the outer planets are relatively farther from the sun and have a longer year.
When compared with inner planets, the outer planets are relatively farther from the sun and have a shorter year.
The outer planets are relatively closer to the sun and have a longer year than the inner planets.
The outer planets are relatively closer to the sun and have a shorter year than the inner planets.
Which of the following is the correct order of these objects based on their distance from the sun, starting with the object closest to the sun?
Earth, asteroid belt, Saturn, Neptune, Mercury
Mercury, Earth, asteroid belt, Saturn, Neptune
Neptune, Mercury, asteroid belt, Earth, Saturn
Saturn, Neptune, Mercury, Earth, asteroid belt
What is a main difference between Earth and Jupiter?
Group of answer choices
Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.
Earth is an inner planet with a relatively long distance from the sun, while Jupiter is an outer planet with a relatively short distance from the sun.
Earth is an outer planet with a gas surface composition, while Jupiter is an inner planet with a solid rock surface composition.
Earth is an outer planet with a relatively short distance from the sun, while Jupiter is an inner planet with a long distance from the sun. PLEASE HELP
Answer:
This is just what I think Im sorry if it's wrong
Explanation:
The outer planets are relatively closer to the sun and have a longer year than the inner planets.
Mercury, Earth, asteroid belt, Saturn, Neptune
Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.
What are the pros and cons of cloning a mammoth?
Answer:
List of Pros of Cloning
They could have a positive impact on the environment. ...
They would help us understand them better. ...
They can help us protect species that are close to extinction. ...
It makes us feel better for driving most of these species into extinction. ...
List of Cons of Cloning
We will be bringing back a species into an environment totally different from the one they lived in.
It puts the conservation of currently endangered species way back.
What are genes that have been changed called?
i dont get it, what am i supposed to do?
Answer:
It appears to be
replacementExplanation:
I did that question.
A student places a small stone with a mass of 5 g into a graduated cylinder containing 50 mL of water. With the stone in the graduated cylinder, the water rises to 75 mL. What is the density of the stone? a. 0.07 g/mL b. 0.20 g/mL c. 5.00 g/mL d. 125.00 g/mL
Answer:
0.20 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
volume = final volume of water - initial volume of water
volume = 75 - 50 = 25 mL
From the question we have
[tex]density = \frac{5}{25} = \frac{1}{5} = 0.2 \\ [/tex]
We have the final answer as
0.20 g/mLHope this helps you
What are the horizontal rows on the periodic table numbered 1-7 called?
Answer: They're called Periods
periods of the periodic table
A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it neared the pile, the magnet started attracting small pieces of iron from the pile. Which of these statements best describes the contents of the pile?
The question is incomplete, the complete question is;
A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it neared the pile, the magnet started attracting small pieces of iron from the pile. Which of these statements best describes the contents of the pile?
F. It is a homogeneous mixture of iron and sulfur. G. It is a heterogeneous mixture of iron and sulfur. H. It is a compound that contains both iron and sulfur. I. It is a compound that can be separated by magnetism.
Answer:
G. It is a heterogeneous mixture of iron and sulfur.
Explanation:
A heterogeneous mixture is one that does not have a uniform composition throughout.
We must recall that a mixture is any combination of substances that do not chemically react together and are separable by physical means.
Having said this, it is clear that I can separate the iron from sulphur by simple magnetic (physical) means. Hence, it is a heterogeneous mixture of iron and sulfur.
Answer:
It is a heterogeneous mixture of iron and sulfur.
Explanation:
Of all chlorine atoms, 75.771% are chlorine-35. Chlorine-35 atoms have
a mass of 34.96885 amu. All other chlorine atoms are chlorine-37 and
these have a mass of 36.96590. Calculate the average atomic mass of
chlorine?
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The average atomic mass is 35.5g.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
Substituting the given values
Average atomic mass=( 34.96885 amu ×75.771% )+( 36.96590 amu × 24.3%)
Average atomic mass=35.5g
Therefore, the average atomic mass of chlorine is 35.5g.
To learn more about mass, here:
https://brainly.com/question/28704035
#SPJ2
What was the same about the atoms of the eggium
plzzz help me out as I was not in class and I missed the lesson
Answer:
Well why didn't you do it? Have a great day and I am so sorry for wasting your points I don't need them. I hope someone helps!! ;)
Explanation:
Compare and Contrast Fossil Fuel and
Sedimentary Rock Formation. (How are they similar and how are they different?)
Answer:
The small sediments that break off are eroded and deposited. The deposited sediment then goes through the processes of compaction and cementation to create sedimentary rock. Fossils from dead plants and animals are found in sedimentary rock. ... Over time, fossils are changed into fossil fuels.
Explanation:
please mark me as brainliest
A sample of a compound containing only carbon and hydrogen was burned to produce 1.36g of water and 5.22g of carbon dioxide. Calculate the empirical formula of the compound?
Answer:
[tex]C_4H_5[/tex]
Explanation:
Hello!
In this case, since the combustion analysis provides us the yielded mass of both water and carbon dioxide, as the sources of hydrogen and carbon in the hydrocarbon, we are able to compute the moles of each via the following mole-mass relationships:
[tex]n_H=1.36gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{2molH}{1molH_2O}=0.151molH\\\\n_C=5.22gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.119molC[/tex]
Now, we divide those moles by the fewest ones (those of carbon) in order to compute their subscripts in the empirical formula:
[tex]C: \frac{0.119}{0.119} = 1 \\\\H:\frac{0.151}{0.119} = 1.27[/tex]
However we need whole numbers, that is why we multiply each subscript by 4 to get 4 for carbon and 5.08 ≅ 5 for hydrogen:
[tex]C_4H_5[/tex]
Best regards!
Metallic bonds are:
A. bonds holding together atoms with very different
electronegativities.
B. bonds holding together a metal and a nonmetal.
C. bonds holding together two atoms of different kinds of metal.
D. bonds holding together two atoms of the same kind of metal.
Answer:
D. bonds holding together two atoms of the same kind of metal.
Explanation:
Metallic bonds are very special kinds of interatomic forces that holds metals together and confers such unique properties on them.
The formation of this bond type is favored by large atomic radius, low ionization energy and a large number of electrons in the valence shell.
The metallic bond is usually an attraction between the positive nuclei of all the closely packed atoms in the lattice and electron cloud jointly formed by all the atoms by losing their outermost shell electrons. This is as a result of low ionization energy.Select the answer that lists the radiation waves in order of increasing
energy
Gamma rays, Infrared, Radio waves
O Radio waves, X-rays, Ultraviolet
O
Visible light, Infrared, X-rays
O Microwaves, Ultraviolet, X rays
Answer:
Concept: Radiology & Chemistry
Energy waves are judged based on their wave length, which is measures from one "hump" to the next In order from least to greatest, aka increasing: Radio Waves, infrared waves, visible light, UV, x-Ray, and GammaGive brainlist and rate positivelyPLEASSSSSSSSSE HELPPPPP
Answer:
3 g of H₂
Explanation:
The balanced equation for the reaction is given below:
Cr₂O₃ + 3H₂ —> 2Cr + 3H₂O
Next, we shall determine the masses of Cr₂O₃ and H₂ that reacted from the balanced equation. This can be obtained as follow:
Molar mass of Cr₂O₃ = (52×2) + (16×3)
= 104 + 48
= 152 g/mol
Mass of Cr₂O₃ from the balanced equation = 1 × 152 = 152 g
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 3 × 2 = 6 g
SUMMARY:
From the balanced equation above,
152 g of Cr₂O₃ reacted with 6 g of H₂
Finally, we shall determine the mass of H₂ needed to covert 76 g of Cr₂O₃. This can be obtained as follow:
From the balanced equation above,
152 g of Cr₂O₃ reacted with 6 g of H₂.
Therefore, 76 g of Cr₂O₃ will react with = (76 × 6) / 152 = 3 g of H₂
Thus, 3 g of H₂ is needed to convert 76 g of Cr₂O₃.
The amount of gas (in terms of moles, mass, and
molecules)
Answer:
was constant
Explanation:
Good luck! :)
Answer:
B. was constant