Answer:
If it loses to electrons the net charge will be +2. If the atom instead gains 4 electrons, the net charge will be -4.
Explanation: When an atom loses electrons( which are negatively charged), it turns into a cation. This means since there is more protons(which are positively charged) than electrons, the charge is positive. The charge is positive and than the number of electrons lost. It is the exact opposite for gaining electrons.
Which of the following is true of a buffered solution? Group of answer choices All of these are true The solution resists any change in its [H+]. The pH of the solution will not change much even if a concentrated acid is added. Any H+ ions added will react with a conjugate base of a weak acid already in thye solution. The pH of the solution will not change much even if a strong base is added.
Answer:
All of these are true
Explanation:
A buffer solution in chemistry is a solution that resists changes in pH when an acid or base is added to it. It is a solution that contains a weak acid and its conjugate base (anion) or a weak base and its conjugate acid.
A buffer is able to resist a change in pH due to the conjugate base and conjugate acid of the weak acids and bases contained in them respectively. The conjugate base/acid are present in an equilibrium quantity with their acid/base counterparts and help to neutralize or react with any additional H+ or OH- from an acid or base added to their solution.
However, when a strong acid or base is added to the buffer solution, there is only a slight change which practically does not change the pH of the solution.
Hence, all of the above options about a buffered solution is true.
On seeing the given options, it is clear that all the options are correct.
What is a buffer?A solution, which resists the change in pH upon the supplementation of an acidic or basic components is known as a buffer.
The following are the characteristics of buffer:
It exhibits a definite pH and it sustains it, that is, it prevents the change in pH or hydrogen ion change. A very slight modification in pH takes place at the time of the addition of small concentration of concentrated base or acid. When a small concentration of strong acid is added to the buffer solution, then the concentration of hydrogen ions enhances in the solution and will react with the conjugate base of the weak acid to maintain the concentration of hydrogen ion in the weak acid-salt buffer solution. When a small concentration of strong base is supplemented to a weak acid-salt buffer then hydrogen ions reacts with the hydroxide ions to produce neutral water and to sustain the equilibrium as per the principle of Le-Cha-telier, the dissociation of weak acid takes place in order to sustain the concentration of hydrogen ions in the buffer solution and thus pH is maintained.Thus, all the given statements are true.
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PLEASE HELP The basic units of measurement for volume, length, and weight in the metric system are the?
Answer:
it looks like the answer that your looking for is B.
Answer:
B may be the answer.
Explanation:
is a force created by the water that is displaced by an object.
Answer:
Buoyancy.
Explanation:
Buoyancy is a force created by the water that is displaced by an object. It is directly proportional to the amount of water that is being displaced by an object.
Hence, the greater the amount of water an object displaces; the greater is the force of buoyancy pushing the object up.
The buoyancy of an object is given by the formula;
[tex]Fb = pgV\\\\But, V = Ah\\\\Hence, Fb = pgAh[/tex]
Where;
Fb = buoyant force of a liquid acting on an object.
g = acceleration due to gravity.
p = density of the liquid.
v = volume of the liquid displaced.
h = height of liquid (water) displaced by an object.
A = surface area of the floating object.
The unit of measurement for the buoyancy of an object is Newton (N).
Is benzene a compound ?
Answer:
Yes
It is an organic chemical compound
Its formula is [tex]C_6H_6[/tex]
Explanation:
A person walks at 2 km/h for four hours. What is their displacement?
Answer:
4km
Explanation:
which of the following is an acid-base indicator? Hydrochloric acid
Sodium hydroxide
Water
Phenolphthalein
Pls help!!
Convert 2.09 x 10° micrograms to decagrams.
Answer:
0.000209 decagrams
Explanation:
You calculate 2.09 x 10 micrograms, then you divide that answer by 100,000 to get your final answer. Thus ending up with 0.000209 decagrams.
Can someone please fill those green boxes for me
(open the image)
Answer:
1. The behaviour of molecules in different phases of matter represents a balance between the kinetic energies of the molecules and the attractive forces between them. All molecules are attracted to each other. At the same time, all molecules are in constant motion, and their kinetic energies increase with the temperature.
2. When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ... Solids, liquids and gases all expand when heat is added.
Explanation:
Why can't astronomers take a picture of a black hole?
Gravity is so strong that even light cannot escape a black hole.
The nearest black hole is too far away to be seen.
There is no way to detect the locations of black holes.
Black holes are too large to photograph.
Answer:
a
Explanation:
To solve this we must be knowing each and every concept related to black hole. Therefore, the correct option is option A among all the given option.
What is black hole?A huge star's demise can result in the formation of a black hole. Such a star's core gravitationally collapses inward onto itself near the end of its existence when its internal thermonuclear fuels run out, destroying the star's outer layers in the process.
The dying star is compressed to a point with zero volume or infinite density known as the singularity by the heavy burden of component matter crashing in from all directions. Astronomers can't take a picture of a black hole because gravity is so strong that even light cannot escape a black hole.
Therefore, the correct option is option A.
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The following are halogens except
a. fluorine
b. iodine
c. chlorine
d. phenol
Answer:
i think this is [d. phenol]
The correct answer:
Phenol
[tex] \large{ \boxed{ \bf{ \color{green}{Option \: D}}}}[/tex]
Phenol is a compound, While other are elments found under the 17th group, and popularly known as Halogens.
Explore more:-The name halogen comes from the Greek words "hals", meaning "salt", and "gen", meaning "to make."The halogens are a group of elements in the periodic table. They are located to the right of the other nonmetals and to the left of the noble gases.The halogens include the five elements fluorine, chlorine, bromine, iodine, and astatine. They make up column 17 of the periodic table.They have seven valence electrons in their outer shell.They all exist as diatomic molecules (two atoms) when in their pure form.Simple compounds that contain halogens are called halides.━━━━━━━━━━━━━━━━━━━━
Question 3(Multiple Choice Worth 1 points)
(01.01 LC)
Which of the following is usually done first in the scientific method of investigation?
O Do research on a particular topic
O Ask a question based on an observation
O Construct a hypothesis to be tested
O Test with an experiment
Answer:
Do research on a Particular topic
Answer:
Do research on a particular topic
Using the Fick equation, calculate cardiac output if a person is consuming 1.41 L O2/min, has an arterial O2 content of 190 ml O2/L, and a venous O2 content of 25 ml O2/L.
Answer:
Cardiac output (CO) = 8.54 l / min
Explanation:
Given:
Oxygen consumption (V) = 1.41 l O2/min
Oxygen in arterial (Ca) = 190 ml O2/L = 0.19 l O2/L
Oxygen in venous (Cv) = 25 ml O2/L = 0.025 l O2/L
Find:
Cardiac output (CO)
Computation:
Cardiac output (CO) = V / (Ca - Cv)
Cardiac output (CO) = 1.41 / (0.19 - 0.025)
Cardiac output (CO) = 8.54 l / min
The basic living unit of all organisms is the- A. Organ B. Tissue C. Organ System D. Cell
Answer:
D:Cells
Explanation:
A cell is a the smallest unit of a living thing. A living thing whether made up of one cell which is Bacteria and a living thing whether made up of many cells which is Humans
Answer:
[tex] \boxed{ \bold{ \huge{ \bold{ \blue{ \sf{cell}}}}}}[/tex]
Option D is the correct option
Explanation:
[tex] \underline{ \bold{ \underline{ \huge{ \sf{cell}}}}}[/tex]
The bodies of all plants and animals are made up of basic units. These basic units are called cells . Cells carry out different life activities like respiration , growth , digestion, excretion etc. All living organisms are made up of cells. Cells are like the bricks of a house. Cells are also called the building blocks of organisms. They are known as the basic structural and functional units of life . They are the smallest unit of life. Cells were discovered by an English Scientist Robert Hooke in 1665 AD . Cells are very small. We cannot see them with our names eyes. We use an instrument called microscope to see them. The shapes of cells vary. However, cells may be oval , round , tabular, branched , cylindrical or irregular in shape. Similarly , the size can vary from very small to large. Usually, the diameter of cells ranges from 0.5 micron to 151 microns.
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The mass of an object is measured to be 55.6 g. Its volume is measured to be 48.5 mL.
What is the object's density? Show the work.
Answer:
1.15 g/mL
Explanation:
The following data were obtained from the question:
Mass (m) = 55.6 g
Volume (V) = 48.5 mL
Density (D) =?
Density is simply defined as the mass of the substance per unit volume of the substance. It is represented mathematically as:
Density (D) = mass (m) /volume (V)
D = m/V
With the above formula, we can obtain the density of the object as follow:
Mass (m) = 55.6 g
Volume (V) = 48.5 mL
Density (D) =?
D = m/V
D = 55.6/48.5
D = 1.15 g/mL
Therefore, the density of the object is 1.15 g/mL
1. A force of 52 N acts upon a 4 kg block sitting on the ground. Calculate the acceleration of the
object.
A force of 52 N acts upon a 4 kg block sitting on the ground. The acceleration of the object is 13 m/s².
What is an acceleration ?The rate at which velocity changes is called acceleration. Acceleration typically indicates a change in speed, but not necessarily. An item that follows a circular course while maintaining a constant speed is still moving forward because the direction of its motion is shifting.
An object's motion is altered by a net force; the larger the net force, the greater the acceleration. To accelerate at the same rate as less massive objects, higher net forces are needed.
The formula F=ma connects force and acceleration. The letters "F," "m," and "a" stand for force, mass, and acceleration, respectively. A push or pull that one object can apply to another is known as force. The pace at which an object's speed changes is known as acceleration.
Formula for acceleration is
a = f / m
Acceleration = force / mass
= 52N / 4kg
= 13 m/s²
Thus, The acceleration of the object is 13 m/s².
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Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
15.67 - 6.943 = [?]
Answer:
8.73
Explanation:
when you are adding or subtracting numbers, the sigfig (significant figure) is based on how many numbers after the decimal. with this info, we can see that 15.67 has 2 sigfigs and 6.943 has 3 sigfigs. when you subtract normally, you would get 8.727, which has 3 sigfigs, so you would round the last 7 up to get 8.73 with 2 sigfigs!
also it is to 2 sigfigs because we know that we go by the least number of sigfigs. hope this helped!
C20H42 = 2C4H8 + 2C2H4 + ?
Answer:
C8H18
Explanation:
To be honest I feel like there is more than one answer but this is the answer I got. You calculate how much is left of carbon and hydrogen in order to balance the equation on the left. Once you got the value you just put it into a polynomial structure and you will get the answer above.
fractional disstilation
Answer:
separation of a liquid mixture into fractions differing in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column.
separation of a liquid mixture into fractions differing in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column.
Explanation:
In the malate aspartate shuttle, glutamate is converted to _________ in the mitochondria while aspartate is converted to ___________ in the cytosol.
Answer:
α-ketoglutarate; oxaloacetate
Explanation:
In the malate aspartate shuttle, glutamate is converted to α-ketoglutarate in the mitochondria by the enzyme glutamate dehydrogenase while aspartate is converted to oxaloacetate in the cytosol by the enzyme aspartate aminotransferase.
An important enzyme in the malate aspartate shuttle, is malate dehydrogenase. In the shuttle system, it is present in the mitochondria and in the cytosol and catalyzes the enzymatic reaction in opposite direction.
how many significant figures does 507.2m have?
Answer: 4
Explanation:
the significant figures are 5 0 7 and 2
Answer: 4
Explanation:
To find the significant digits we have few methods.
METHOD 1--Count from left to right
A number that has a decimal point, count digits from the first number from the left that isn't zero.
METHOD 2--Count from right to left
A number that doesn't have a decimal point, count digits from the first number from the right that isn't zero.
-----------------------
It is obvious that 507.2 has a decimal point, so we count from left which we will start with 5.
5, 0, 7, 2
There are 4 digits.
Hope this helps!! :)
Please let me know if you have any question or need any further explanation
which particle determines the nuclear charge?
answer:
atomic number
the same chemical element is characterized by the number of protons in the nucleus that determines the total positive charge.
what is the periodic table of elements
Answer:
[tex]\large \boxed{\mathrm{view \ explanation}}[/tex]
Explanation:
The periodic table of elements is a table consisting of elements arranged by atomic number and properties. There are a total of 118 elements discovered.
Answer:
Periodic table of element is the tabular display of chemical elements which are arranged by atomic numbers, electron configuration and recurring chemical properties
Explanation:
Calculate the amount of solvent needed to prepare 50g of 10% solution of Tincture iodine. Name the solvent.
Answer:
Calculate the amount of solvent needed to prepare 50g of 10% solution of tincture Iodine.
Name the solvent
Explanation:
sodium
Hope it is helpful.....
why is methane the simplest alkane?
The force of gravity is stronger on Earth than it is on the planet Mars. If an astronaut travels to Mars, what will happen to her mass when she arrives? The mass of the astronaut will increase on Mars. The mass of the astronaut will decrease on Mars. The mass of the astronaut will be equal to her weight on Earth. The mass of the astronaut will stay the same as it is on Earth.
If an astronaut travels to Mars, the mass of the astronaut will decrease on Mars when she arrives. The correct option is B.
What is the force of gravity?The force of gravity is a force that is responsible for the presence of everything object and human in their place. It gives weight to an object. Without gravity, everyone will be floating in the air.
The force of gravity is different in different places. Like on the earth, there is a strong force of gravitation. On the moon, there is the less gravitational force. In mars, there is less gravitation force than on earth.
Because there is less gravitational force on Mars than on the earth, so the weight of the astronaut will be lower on Mars than on the earth.
Thus, the correct option is B. The mass of the astronaut will decrease on Mars.
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Question 4
4. Organic chemistry is chemistry that studies carbon containing
substances.
True
False
Answer:
true
Explanation:
in which order did the events formings our solar sytem occur
Answer:
The solar nebula spun faster and faster and flattened into a rotating disk. Most of the gas was pulled toward the center, where it became hot and dense, forming the Sun.
Explanation:
true or false: after glassware is heated it
should be allowed to cool to
room temperature slowly.
Answer:
True
Explanation:
Glasswares are glass-made substances that cannot be done without in the laboratory. They are used to hold and store chemicals, conduct chemical reactions etc. Common glasswares include conical flask, beakers, test tubes, volumetric flasks, pipette etc.
These glasswares are sometimes used to hold chemicals that needs to be heated, making the glasswares hot as well. Since they are made of glass materials, they are very fragile and must be handled carefully. One of the precautions when handling a glassware is that after hearing, they must be allowed to cool down slowly at room temperature in order to avoid breakage. Hence, the statement is TRUE.
what two elements in the sun mostly made of
The sun is made up of two main elements, hydrogen and helium.
Hydrogen makes up about 92% of all of the atoms in the sun while helium makes up about 7.8%. Oxygen, carbon, neon and nitrogen make up most of the remaining 0.2%.Which of the following is a property of a pure substance?