Answer:
True I think..-
Explanation:
Sorry if it's wrong.-
Chelsea adds a 65% acid solution to 25 milliliters of a solution that is 30% acid. How much of the 65%
acid solution should be added to create a solution that is 40% acid?
Answer:
10 ml
Explanation:
The concentration of the acid solution Chelsea adds to the 25 milliliters of 30% acid solution = 65%
The concentration of the acid solution Chelsea requires = 40%
The volume, X, of the 65% acid solution required is given as follows;
65% × X + 30% × 25 = 40% × (25 + X)
As fractions, we have;
0.65 × X + 0.3 × 25 = 0.4 × (25 + X)
0.65·X + 7.5 = 10 + 0.4·X
0.65·X - 0.4·X = 10 - 7.5
0.25·X = 2.5
X = 2.5/0.25 = 10
X = 10 ml
The volume of the 65% acid that should be added to create a solution that is 40% acid = 10 ml.
the action force always acts in the ____ direction as the reaction force
Answer:
opposite
Explanation:
Newtons law explains that for every action force there is an equal and opposite reaction.
What is the process by which new oceanic crust is added?
A Seafloor Spreading
B) Earthquakes
C) Trenches
D) Plate Tectonics
Answer: A
Explanation:
Answer:
A.Seafloor spreading
Explanation:
help :(
If 4.7 moles of oxygen gas are allowed to react with 3.9 moles of iron according to the following equation:
4 Fe + 3 O2 → 2 Fe2O
How many moles of Fe2O3 can be formed?
Moles of Fe₂O₃ formed : 1.95
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
[tex]\tt 4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
We find the limiting reactant from the ratio of the mole and the reaction coefficient
Fe ⇒ 3.9 : 4 = 0.975
O ⇒ 4.7 : 3 = 1.56
Because the ratio of Fe is smaller, then Fe becomes the limiting reactant
Reaction
4Fe + 3O₂ ⇒ 2Fe₂O₃
mol Fe₂O₃ from mol of Fe as limiting reactant
mol ratio Fe₂O₃ : Fe = 2 : 4, then mol Fe₂O₃ :
[tex]\tt =\dfrac{2}{4}\times 3.9=\boxed{\bold{1.95}}[/tex]
Why don't molecular compounds conduct electricity when dissolved in water?
Answer:
Ionic compounds conduct electricity when dissolved in water, because the dissociated ions can carry charge through the solution. Molecular compounds don't dissociate into ions and so don't conduct electricity in solution.
Help please if you can answer this first I'll give you the brainliest
Answer:
1. gas
2. false
Explanation:
How many atoms of aluminum (Al) are contained in 3.73 moles of alumni
Number of atoms : 2.245 x 10²⁴
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
n= 3.73 moles
Number of atoms :
[tex]\tt 3.73\times 6.02\times 10^{23}=\boxed{\bold{2.245\times 10^{24}}}[/tex]
A meteorologist uses a weather map to explain an upcoming change in weather. The map shows a blue line with triangles approaching a red line with semicircles. Based on the map, which weather prediction is most valid? (1 point) A a significant drop in temperature will occur across the area. B There is no chance of precipitation in the forecast. C Warm temperatures will replace cold temperatures. D Humidity levels will rise.
Answer:
Option C: Warm temperatures will replace cold temperatures.
Explanation:
In a weather map, a warm front is depicted with a red line and red semi circles while a cold front is depicted with a blue line and blue triangles.
Now, we are told that the map shows a blue line with triangles approaching a red line with semi-circles. This means that the cold front is approaching the warm front.
Now a warm front is simply defined as the transition zone where warm air mass gradually replaces a cold air.
Thus, it means the weather map depicts the fact that warm temperature is replacing cold temperature.
Thus; Option C is correct.
Answer: 1: A cold front moved into the area. 2: It would actually be A. A significant drop in temperature will occur across the area. 3: Movement of large air masses. 4: “A Strong Cold Front Threatens the Region”. 5: a meeting of two air masses with major differences in temperature and moisture.
Hope you got 100 because of this!
a student is using colored beads to make a model of aluminum sulfate, Al2(SO4)3.
Aluminum atoms are represented by green beads, sulfur atoms by blue beads, and
oxygen atoms by yellow beads. What combination of beads should the student use for
the model?
The combination of beads should the student use for the model :2 green, 3 blue and 12 yellow
the modelFurther explanationIn the chemical formula of a compound there are numbers:
1. The number indicates the number of atoms written after the element symbol
2. The number after the parentheses represents the number multiplied by the number of atoms in parentheses.
3. The number before the chemical formula shows the number of molecules behind it, which is usually used in equations
To calculate the beads needed to make a model, we must count the number of atoms of the Al₂(SO₄)₃ molecule
In the Al₂ (SO₄) ₃ molecule there are 3 atoms : Al, S, and O
1. Number of Al atoms: 2 2. The number of atoms S = 3 x 1 = 3 3. The number of atoms O = 4 x 3 = 12So the combination of beads
2 green(for Al), 3 blue(for S) and 12 yellow(for O)
Answer:
2 blue, 3 yellow, and 12 green
Explanation:
which statement describes what happens inside
a liquid thermometer that shows an increase in
temperature?
a. the volume of the liquid decreases because
of an increase in kinetic energy.
b. the movement of the particles decreases
because of a decrease in kinetic energy. .
c. the volume of the liquid increases because
the movement of the particles decreases.
d. the movement of the particles increases
because of an increase in kinetic energy.
Answer:the volume of the liquid increases
Explanation:
Convert each measurement into scientific notation. For example, 8.73 Ms is the same as 8.73 x 106 because the “M” stands for 106
107pg
(I'm assuming I have to convert the 107pg but I am unsure of how to answer this)
Answer:
[tex]107pg = 107 \times {10}^{ - 12}g =1.07 \times {10}^{ - 10} g\\ because \: pico, \: p = {10}^{ - 12} .[/tex]
If you were to decrease thermal energy, what would happen to the particles?
Answer: Explanation:
You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster (increased kinetic energy). Particles get farther apart (increased potential energy).
3
1 point
1
Select ALL of the true statements
An atom of a given element will still be that element if the number of protons changes
Atoms are mostly made of empty space
An atom of a given element will still be that element if the number of electrons changes
OOGOOO
An atom of a given element will still be that element if the number of neutrons changes
Electrons have a negligible mass compared to the rest of the atom
The atoms mass comes mostly from the neutrons
Previous
Answer:
Not 100% sure but...
Explanation:
I know that the second, third and fifth one are correct, not sure if there are any more.
How many molecules are in 1.35 mol of CS2
Answer:
There are there are 8.13-10^25
Explanation:
N(CS2)= 1.35* (times) 6.02-10^ 25= 3.13-10^25 molecules
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of moles of CS[tex]_2[/tex] = 1.35 mol
Substituting all the given values in the above equation, we get
number of atoms/molecules= 1.35 × 6.022×10²³
number of atoms/molecules=8.12×10²³ molecules
Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
To know more about mole, here:
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Autism is a disability that results from a disorder in the central nervous system. It has been speculated that the increasing number of cases of autism in recent years is due to the increase in the number of vaccinations given to young children. What might be another possible explanation for this phenomenon?
Answer:
Explanation:
As described in the question, autism is a disability that arises from a disorder in the central nervous system which is actually characterized by abnormality in the brain structure and then function. Autism is known for symptoms such as challenges with communication and interaction and some obsessive behaviors. While there is generally no known scientific cause for autism but trends have suggested that vaccination in young children causes autism.
However, genes could also be involved in this phenomenon because there have been reports of unusual genetic sequence in children that have autism. Hence, there is a possibility that vaccination actually triggers this genetic sequence which is then expressed as autism in the children.
Please note this isn't a scientific fact and just a possibility as requested in the question.
The elements least likely to form bonds are found in which group? 15 16 17 18
Answer:
i think 15 but dont get mad if not (❁´◡`❁)
Explanation:
Answer:
The answer is 18
Explanation:sorry if im wrong TwT
Which of the following is the best structure for CH2O2? Explain your reasoning.
Answer:
I'm guessing structure 1
Answer:
no
Explanation:
no
g. I am present in meteorites and in the sun. When pure, I am a strong, lustrous, white metal, with a low
density. I have excellent corrosion resistance. I burn in air and am the only element that burns in
nitrogen. I am marvelous in fireworks. What am I, and what is my symbol?
I think the answer should be titanium, the symbol is Ti.
is sandy, silt, or clay loam better? and why?
why hot water is hot on touching?
Thermal Energy
When a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.
1. Based on its location, which element would you predict has chemical properties most
similar to argon (Ar)?
A. Chlorine (CI)
C. Nitrogen (N)
B. Helium (He)
D. Aluminum (Al)
Answer:chlorine
Explanation:
It’s the answer on the big test
in one to 2 sentences explain how a stimulus to one type of receptor might be percieved as a simulus to another type of receptor in people who have synesthesia???
HELP
Synesthetes — or people who have synesthesia — may see sounds, taste words or feel a sensation on their skin when they smell certain scents.
I don't know if this helps at all, but i hope it does.
A hiker tries to prepare a hard-boiled egg on the high slopes of Mount Everest. The base camp is located 5,300 meters above sea level. The hiker observes that the water begins to boil at 82⁰C, much lower than the 100⁰C needed to cook the raw egg. He hopes that just leaving the egg in the boiling water longer will let the egg cook. Will he have hard-boiled eggs for breakfast?
Answer:
He will not have hard-boiled eggs for breakfast
Explanation:
The given parameters are;
The elevation at which the base camp of the hiker is located = 5,300 meters
The boiling point of water at the elevation of the base camp = 82°C
The temperature required to cook the raw egg = 100°C
Therefore, we have;
The temperature of the boiling water at the given elevation of the base camp 82°C < The temperature required to cook the raw egg 100°C
Therefore, the eggs will not be hard boiled.
The hiker won't have hard-boiled eggs for breakfast as a result of the
boiling point of water being less than 100⁰C.
The boiling point decreases with an increase in altitude. The hiker was at
5,300 meters above sea level which made the boiling point of water to be
decreased to 82⁰C.
Since the water isn't able to achieve the boiling point of 100⁰C, then the raw
egg won't be hard boiled for breakfast.
Read more on https://brainly.com/question/25725550
Put the following scientists in order of their discoveries: 1. Dalton, 2. Bohr, 3. Rutherford, 4. Democritus, 5. Thomson
Please help me I really need the answer
List 3 properties of solids. Do the same for liquids and gases.
Answer:
GAS .assumes the shape and volume of its container
particles can move past one another
.compressible
lots of free space between particles
.flows easily
particles can move past one another
LIQUID assumes the shape of the part of the container which it occupies
particles can move/slide past one another
.not easily compressible
little free space between particles
.flows easily
particles can move/slide past one another
SOLID .retains a fixed volume and shape
rigid - particles locked into place
.not easily compressible
little free space between particles
.does not flow easily
rigid - particles cannot move/slide past one another
Which element would you expect to have the largest radius based on the Periodic Table?
Lead
Selenium
Chlorine
Answer:
Lead
Explanation:
As you move down the periodic table, the elements get larger and gain additional electron shells, increasing the radius. In order, they are on the table as Chlorine, Selenium, Lead.
how are electrons arranged in elements with atomic numbers 1 through 10?
Answer:
See explanation
Explanation:
For elements with atomic numbers 1-10, the arrangement of electrons is as follows; 1s 2s 2p.
These elements are found in the second period that commences at lithium and ends in neon.
The ten electrons that may be found in the atoms of these elements are arranged in orbitals as shown above.
Johnny wanted to paint the ceiling of his room to show the stars of the Milky Way galaxy. What color(s) should he use?
Answer:
He should use black a light purple brown, tan, blue, and just a tiny bit of pink!
Hope this helps!!
Explanation:
If Johnny wanted to show the brightness of the stars, he should use blue, light blue, yellow, orange, red, and white.
What is Milky way??The Milky Way is a huge collection of stars, dust and gas .
The Milky Way is seen as a mostly flat, irregularly-shaped feature that stretches from side to side The Milky way is the mixture of the colors as blue , yellow , orange and white so that it express the appearance of brightness of stars , dust and gasHence , Johnny should use blue, light blue, yellow, orange, red, and white.
Learn more about milky way below
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Infer what the term “biogeochemical cycles” means. How do you think the term relates to a food chain?
Answer: Biogeochemical cycles are usually described with box models.
Explanation: Matter flows through trophic levels and elements are recycled among ecosystems using biogeochemical cycles. As nutrients move through ecosystems, the compounds they form are usually transformed.
a student collected data about how different fertilizers affect a plant growth. which type of graph should they use to show the data? PLS HELP ASAP :C worth 100 points lol
Answer:
I think they should use a bar graph
Explanation:
Because if they use a bar graph they could mark each of the different kind of fertilizer and they could easily see which one affected it the most, either good or bad, by the looking at the heights of the bars to determine your conclusion.
Hi there!
:bar graph:
If they use a bar graph they could mark each of the different kind of fertilizer and they could see easier to tell which one affected it the most, by looking at the heights of the bars to determine the answers.