Answer:
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Explanation:
this is what i found hope it helps :)
Answer:
Sound is a form of energy which is caused due to the vibration of an object.
HELP ME PRETTY PLS PLS HELP ME FAST
Answer:
The producer is the grass, and energy flows from the mouse to both the snake and the owl.
Explanation:
The producer is usually defined as a "Producers, also known as autotrophs, make their own food.". Thus, the grass is the producer of the food web provided.
The energy also flows from the mouse to the snake and the owl, as the mouse has two arrows that lead away from it, leading both to the snake and the owl.
Hope this helps.
a chemist dissolves 0.564 moles of manganese (IV) oxide (MnO2) in water, and adds enough water to make 0.510 L of solution. Calculate the molarity of the solution.
Answer:
The molarity of the solution is 1.1 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity is a measure of the concentration of that substance that is defined as the number of moles of solute divided by the volume of the solution.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex]
In this case
number of moles of solute= 0.564 molesvolume= 0.510 LReplacing:
[tex]molarity=\frac{0.564 moles}{0.510 L}[/tex]
Solving:
molarity= 1.1 [tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 1.1 [tex]\frac{moles}{liter}[/tex]
A solution contains 2.38 g of magnesium
chloride, MgCl2, in 500 cm3 of solution.
(a) Calculate the number of moles of
magnesium chloride in 500 cm3 of the
solution.
(b) What is the concentration of
(i) magnesium chloride in mol/dm3;
(ii) chloride ions in g/dm3?
Answer:
a. 0.0250 moles MgCl2
b. i. 0.0500mol MgCl2 / dm3
ii. 3.54g Cl-/dm3
Explanation:
a. In 500cm3, the mass of MgCl2 (Molar mass: 95.211g/mol) is 2.38g. The moles are:
2.38g * (1mol / 95.211g) = 0.0250 moles MgCl2
b. The dm3 are (1000cm3 = 1dm3):
500cm3 * (1dm3 / 1000cm3) = 0.500dm3
Concentration is:
0.0250 moles MgCl2 / 0.500dm3
i. 0.0500mol MgCl2 / dm3
ii. Moles Cl-:
0.0250 moles MgCl2 * (2mol Cl- / 1mol MgCl2) = 0.0500 moles Cl-
Mass Cl- -Molar mass: 35.45g/mol-:
0.0500 moles Cl- * (35.45g / mol) = 1.77g of chloride ions
1.77g Cl- / 0.500dm3:
3.54g Cl-/dm3
Un gas a una temperatura de 38°C, tienen un volumen de 21 Lts Litros. ¿Qué volumen tendrá si la temperatura sube a 67°C?.
Answer:
. ¿Qué
Explanation:
Hope you have a great day
A sample of carbon tetrachloride (CCI) contains 3 moles of the substance. How many atoms are there in the sample?
O 1.806 x 1024
05
0 15
O 9.03 x 1024
Answer:
Number of atoms =1.806×10²⁴
Explanation:
You have the number of moles of Carbon tetrachloride which is n=3
And you are looking for number of atoms that are in the sample, which are represented by the letter "N"
The formula that has both number of moles(n) and number of atoms(N) is written as n=N/Na
Na is called the Avogadros number and it is equal to 6.08×10²³, it never changes(it is a constant)
So you will substitute the number of moles and the avogadros number to you formula, and the only unknown will be the number of atoms which you are looking for
n=N/Na3=N(6.02×10²³)N=1.806×10²⁴ atoms of CClNB: N does not represent the number of atoms only. It may also represent the number of particles or molecules...
A sample of a certain isotope has an initial activity of 40,000 cpm. After 24.8 days, the activity is 2500 cpm. What is the half life of the isotope?
Answer:
6.2 days
Explanation:
initial activity = 40,000 cpm
one half-life = 20,000 cpm
two half-lives = 10,000 cpm
three half-lives= 5,000 cpm
four half-lives = 2500 cpm
24.8 days/4 half-lives = 6.2 days/ half-life
A sample of an unidentified compound contains 29.84% sodium, 67.49% chromium, and 72.67% oxygen. What is the compound's empirical formula? If the molar mass of the molecular formula is 523.96 g/mol, find the molecular formula.
Empirical Formula:
Molecular Formula:
Answer:
i would help i just dont know sorry
Explanation:
How does the uneven hearing of earth cause convection currents to form?
PLEASE ANSWER:)
Answer:
Because of the tilt of Earth on its axis, Earth's surface and atmosphere are unevenly heated by the Sun. Convection currents form in the atmosphere as warmer air rises and cooler air sinks.
Uneven hearing of earth cause convention currents to form because the Earth's surface and atmosphere are unevenly heated by the Sun
Do the middle one, will give brainliest
Answer:
it answer is (B)
the formula of toluene is C6H5CH3
it consists of a benzene ring with methyl group attached to it
A molecule
B compound
C atom
D element
Answer:
D. Element.
Explanation:
Atoms form elements. Elements form molecules. Molecules form compounds.
What do electrons Do in ionic bond? Do they transfer from metals to no metals or nonmetal to metals?
Answer:
electrons get transfered from metals to non metals in the formation of ionic bond.
metals have the tendency to lose electrons whereas non metals tend to stabilize by gaining electrons.
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state
compare with the temperature at the end of the change?
Temperature vs. Time
140
120
100
Temperature (°C)
ВО
80
40
20
Time (min) →
The temperature is always lower
The temperature is always the same.
The temperature is usually lower
O The temperature is usually higher
O
Answer:
always the same
Explanation:
e2020
metamorphic rocks result from the
A) cooling and solidification of molten magma
B) compression and cementation of soil particles
C) recrystallization of rocks
D) erosion of rocks
Which of the following could be predicted using Dmitri Mendeleev's periodic
table?
A. Number of neutrons
B. Atomic number
C. Atomic mass
D. Isotope number
The atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.
What is the Periodic Table?The Periodic Table of elements is an arrangement of elements in groups and periods based on increasing atomic number.
The first periodic table of elements was designed by Mendeleev.
The arrangement was based on increasing atomic mass of elements.
Therefore, atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.
Learn more about Periodic Table at: https://brainly.com/question/15987580
If 85.0 grams of ethanol reacts, how many grams of carbon dioxide are produced?
Answer:
162.4g of CO2 are produced
Explanation:
The combustion of ethanol, C2H5OH, occurs as follows:
2C2H5OH + 7O2 → 4CO2 + 6H2O
Where 2 moles of C2H5OH produce 4 moles of CO2.
To solve this question we need to convert the mass of ethanol to moles. Then, the moles of ethanol to moles of CO2 using the balanced reaction and to mass:
Moles C2H5OH -Molar mass: 46.07g/mol-
85.0g * (1mol / 46.07g) = 1.845 moles C2H5OH
Moles CO2:
1.845 moles C2H5OH * (4mol CO2 / 2mol C2H5OH) = 3.69 moles CO2
Mass CO2-Molar mass: 44.01g/mol-:
3.69 moles CO2 * (44.01g/mol) =
162.4g of CO2 are producedWhat is the pH of a solution with a 3.2 × 10−5 M hydronium ion concentration
4.3
4.5
11
12
Answer:
4,5
Explanation:
-log(H+)=-log(3,2x10^-5)=4,49
The pH of the solution will be 4.49
What is pH?A solution's acidity or alkalinity is determined by the concentration of hydrogen ions in the solution. Typically, the pH scale ranges from 0 to 14. Acidic aqueous solutions with a pH will be less than 7 at 25°C are acidic, while basic or alkaline aqueous solutions with a pH will be more than 7 considered basic or alkaline.
The pH formula can be represented as:
pH = -log[[tex]H_{3}O[/tex]]
Calculation of pH is shown as:
It is given that the , [tex][H_{3}O^{+} ][/tex] = 3.2 × [tex]10^{-5} M[/tex].
Now, put the value of given data in pH formula.
pH = -log[3.2 × [tex]10^{-5} M[/tex]]
pH = -log[3.2] -log[[tex]10^{-5} M[/tex]]
pH = -0.5051b+5 log 10 (log 10 = 1)
pH = 4.49
Therefore, the value of pH will be 4.49.
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how many moles are there in a 3.00M solution when you have 1.78L
(reply if you know the answer or get reported) How many atoms are there in 5 grams of silicon?
Similarly, for one gram atomic weight of silicon with atomic weight of 28 grams, one mole of silicon still contains 6.022 × 1023 silicon atoms.Answer:
Explanation:
hope it helps
give me 3 facts and 3 superstitious about the moon
Facts:
1. The Moon has no atmosphere
2. The Moon has quakes
3. The Moon is a dusty ball of rock, measuring 3,476km in diameter
Superstitions :
1. Gazing too long at the full moon will bring out one’s inner lunatic.
2. The waxing of a new moon is the best time for sowing seeds, weddings, childbirth, new projects and travel.
3. It is bad luck to see the new moon, for the first time of the night, through glass or tree branches.
Hope this helps and if it does, don't be afraid to give my answer a "Thanks" and maybe a Brainliest if it's correct?
What should Peru do to improve science?
Answer:
scientists say the country has many home advantages for good research,but it desperately needs more government interest
8. Skin cancer is a disease that occurs when skin cells grow in an uncontrolled way. It can be caused by UV
light, which can alter the genetic sequence of skin cells. Which choice below best describes how UV
light might cause skin cancer?
a. UV light changes the genetic code that makes the proteins in the skin cell. The new code
changes the structure and function of these proteins. When the proteins that control cell
growth change in a way that makes them no longer work, cancer is the result.
b. UV light changes the shape of the proteins in the skin cells. These proteins change the
genes in the cell. This makes the cell grow uncontrollably resulting in cancer.
C. UV light makes skin cells grow faster. Overtime, the skin cells adapt to the UV light by
growing faster and faster. Eventually they grow so fast that their growth is no longer
controlled, this results in cancer.
d. None of the above.
Answer:
Explanation:
I think none of the above, because when caused by a UV light it damages the cells. And if enough builds up overtime it causes uncontrollable growth and leads to skin cancer.
Hope that helped? It might be another answer honestly.
Help down below, thanks! <3
(03.05 LC)
Which of the following increases the concentration of OH negative ions?
1.Acid
2.Base
3.Water
4.Salt
Please, I need help with this problem.
4. Cell size is limited by the
(a) amount of cytoplasm.
(b) cell's ability to get rid of wastes.
(c) the size of the nucleus.
(d) the size of the plasma membrane.
Answer:
Maybe it's (a) amount of cytoplasm ...
hope its right
Why does water appear blue?
Answer:
Explanation:
Water is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see.
A solution at 25 degrees Celsius has a pOH of 6.42. What is the pH of this solution?
0.842
3.80
5.59
7.58
You must go to the mountain or apraturakados to answer this question. It will be a daring adventure, but the journey will be worth it. Good luck, student.
The actual answer is 7.58, sorry...
When A solution at 25 degrees Celsius has a pOH of 6.42. So here the pH of the solution is 7.58.
Calculation of the pH of the solution?Since we know that
pH + pOH = 14
here
pOH is 6.42
So,
pH = 14 - pOH
= 14 - 6.42
= 7.58
hence, When A solution at 25 degrees Celsius has a pOH of 6.42. So here the pH of the solution is 7.58.
Learn more about pH here: https://brainly.com/question/17487735
PLEASE HELP !
(In the column for the other reactants and/or products indicate whether they increase, decrease, or stay the same.)
Chemical Reaction:
A (g) + B (g) ←→ 3C (g)
Blue ← → Clear, Colorless
WHAT ARE THE:
Stress , Equilibrium Shift (right or left) , A (g) , B (g) , C (g) , What color?
1. Add A
2. Add B
3. Add C
4. Remove A
5. Remove C
Answer:
See Explanation
Explanation:
We must remember that when a constraint such as a change in concentration, pressure or temperature is imposed on a reaction system in equilibrium, the equilibrium position will shift in such as way as to cancel the constraint.
If more of A or more of B is added to the system, the equilibrium position will shift towards the right and the solution becomes clear and colorless.
If C is added to the system, the equilibrium position will shift towards the left and the solution colour turns blue.
If A is removed from the system, the equilibrium position is shifted towards the left and the solution once again turns blue.
If C is removed from the system, the equilibrium shifts towards the right and the solution turns clear and colorless
You are working in the lab, how many grams of solute you need to make 200.0 g of 3.4% of solution?
Answer:
6.8g of solute are needed
Explanation:
Percent by mass, (w/w%) is defined as the mass of solute in 100g of solution. A solution that is 3.4% contains 3.4g of solute in 100g of solution. That means to make 200g of solution are required:
200g solution * (3.4g solute / 100g solution) = 6.8g of solute are needed
Infer: Why might a zone of upwelling be a good place to fish?
First lets define upwelling
Upwelling- a rising of seawater, magma, or other liquid
In this case, you would be looking at a river, lake, ocean, or other body of water good for fishing.
You'd want to look for a place with upwelling because when there is a rise of water, the sea creatures within it will rise too. So the fish in the bottom of a lake for example would be brought up to the surface of the water or near the surface which is where your fishing rod is trying to grab the fish.
I hope this helps! Don't be afraid to reach out with any further questions!