Answers
Answer:
I'm pretty sure is a mixture
Related Questions
What is the main hitch or problem in getting fusion to occur?
Answers
Answer:
working with intense pressure and heat
Explanation: you would you have to work with intense pressure and heat in order to fuse two hydrogen nuclei together to create helium isotopes.
Answer:
The main problem is achieving ignition to start the reactions. Fusion reactions can occur only at extremely high temperatures.
Explanation:
1. A force of 52 N acts upon a 4 kg block sitting on the ground. Calculate the acceleration of the
object.
Answers
Formula: a= f/m
Acceleration = force/ mass
Acceleration = 52N / 4kg
Acceleration = 13 m/s^2
I HOPE THIS HELPED :)
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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When centrifuging an anticoagulated tube the liquid at the top of the tube will be:__________.
Answers
Answer:
The resulting liquid at the top is the plasma.
Explanation:
This question seeks to compare the difference between the methods of preparation of plasma and that of serum.
To obtain serum from a blood sample, the blood sample is collected in a plain bottle (usually red capped) and the blot is allowed to clot by leaving it standing/alone for about 15 - 20 minutes after collection. This clotted blood is then centrifugated at 2000 - 3000 revolution per minutes (rpm) for 10 minutes. The liquid at the top after centrifugation here is the serum.
In preparing plasma, the blood sample is collected in a bottle that has anticoagulant like the EDTA bottle (which contains an anticoagulant called EDTA) and then inverted slightly about 7 times to allow the EDTA mix with the blood. This blood sample is then centrifugated at 2000 - 3000 for 15 mins. The resulting liquid at the top is the plasma.
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.
Answers
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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A block of wood has a mass of 180 grams it is 10.0cm long, 6.0cm wide and 4.0cm thick what is it’s volume and density
Answers
Answer:
Density = 0.75 g/cm³Explanation:
Density of a substance is given by
[tex]Density(\rho) = \frac{mass}{volume} [/tex]From the question
mass of the wood = 180 g
Since the wood is a cuboid we can find the volume using the formula
Volume = length × width × height
From the question
length = 10cm
width = 6 cm
height = 4 cm
Volume = 10 × 6 × 4 = 240 cm³
Substitute the values into the above formula and solve for the Density
That's
[tex]Density(\rho) = \frac{180}{240} \\ = \frac{3}{4} [/tex]We have the final answer as
Density = 0.75 g/cm³Hope this helps you
in which atom is the number of protons equal to the number of neutrons?
Answers
Answer:
neutral
Explanation:
The basic living unit of all organisms is the- A. Organ B. Tissue C. Organ System D. Cell
Answers
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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List the four states of matter, from top to bottom, in order of decreasing energy.
Answers
They are. solids liquids gases and plasma. and fift one in man made.
Questions
1.
What is diffusion?
2
Explain the process of osmosis with the help of examples.
3.
Define the term 'active transport'.
State the difference between active transport and diffusion.
Answers
Answer:
Explanation:
1. diffusion is a physical process when there is random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
2. Osmosis is the diffusion of water where molecules of water move passively (without energy) from high concentration to low concentration. eg: the way water rushes into a sponge.
3. Active transport moves particles from low to higher concentration. The difference between diffusion and active transport is diffusion does not require energy (eg: oxygen moving from the airways to the lungs - there is very little oxygen in the lungs but lots in the air). whereas active transport does require energy (eg: when plants take up nutrients from the soil. The soil does not have a large concentration of nutrients, but the plant does)
In the malate aspartate shuttle, glutamate is converted to _________ in the mitochondria while aspartate is converted to ___________ in the cytosol.
Answers
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 zeroes in 0.0079 are significant digits
Answers
Answer:
None
Explanation:
Numbers can only be significant in three ways.
1) Non-zero numbers
2) Zeroes between non-zero numbers
3) Trailing zeroes in a decimal. Only counts if there is a decimal point.
Since the zeroes are not trailing or located between two non-zero digits, there are no zeroes in 0.0079.
There are three zeros in the 0.0079 significant number value and they are not significant too.
What are significant figures?The significant figures are the minimum numbers from zero to nine and which are use to represent the number which results are uncertain and cannot be round off.
Starting zeros are not significant, decimal is not a significant figure, ending zeros ae also not significant and ending zeros without decimal is not a significant figure.
Therefore, there are three zeros in the 0.0079 significant number value and they are not significant too.
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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.
Answers
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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Determine the volume in cm3 of 7.2 x 10-4 m3 ?
Answers
Answer:
The volume of [tex]7.2\times 10^{-4}\ m^3[/tex] is equal to 720 cm³.
Explanation:
We know that,
1 m = 100 cm
We need to convert [tex]7.2\times 10^{-4}\ m^3[/tex] to cm³.
Also,
1 m³ = 10⁶ cm³
To convert [tex]7.2\times 10^{-4}\ m^3[/tex] to cm³, the step is as follows :
[tex]7.2\times 10^{-4}\ m^3=(7.2\times 10^{-4}\times 10^6 )cm^3\\\\=720\ cm^3[/tex]
So, [tex]7.2\times 10^{-4}\ m^3[/tex] is equal to 720 cm³.
What is the volume in milliliters, of a sample of helium that has a mass of 1.73 x 10^-3g given that the density is 0.178 47g/L
Answers
Given :
Mass of helium sample , [tex]m=1.73\times 10^{-3}\ g[/tex] .
Density of helium , [tex]\rho=0.178\times 10^{-3} \ g/cm^3[/tex] .
To Find :
The volume in millilitres .
Solution :
Density is given by , [tex]\rho=\dfrac{m}{V}[/tex]
So , volume is , [tex]V=\dfrac{m}{\rho}[/tex]
Putting given values in above equation we get :
[tex]V=\dfrac{1.73\times 10^{-3}}{0.178\times 10^{-3}}\ ml\\\\V=9.72\ ml[/tex]
Therefore , volume of sample of helium is 9.72 ml .
Hence , this is the required solution .
The volume of sample in milliliters is 9.72 mL .
Given data:
The mass of sample is, [tex]m=1.73 \times 10^{-3} \;\rm g[/tex].
The density of the helium sample is, [tex]\rho = 0.17847 \;\rm g/L =0.17847 \times 10^{-3} \;\rm g/cm^{3}[/tex].
The given problem is based on the concept of density. The density of any substance is equal to the mass per unit volume of the substance. The expression is given as,
[tex]\rho =\dfrac{m}{V}\\\\\\V =\dfrac{m}{\rho}\\\\\\V =\dfrac{1.73 \times 10^{-3}}{0.17847 \times 10^{-3}}\\\\V =9.72 \;\rm mL[/tex]
Thus, we can conclude that the volume of sample in milliliters is 9.72 mL .
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What errors tend to lead to pseudoscience?
Answers
Answer:
Some errors includes:
- Having contradictory information
- Exaggerated and false cliams
- Reliance on bias rather than facts
- etc
Explanation:
Pseudoscience is a non-science that falsely portrays itself as real science. It does so by copying parts of real science or ignoring sections of the scientific method within an investigation. Even a tiny mistake can turn a scientific explanation into a pseudoscientific claim.
For example, if a group of scientists want to know if students prefer the taste of a particular type of soda, they must control all factors in their experiment except for the students' sense of taste. If they conduct their tests on students and allow them to see the color of the soda they are testing, then their results are unreliable. There is bias in their results. They would not be able to claim any preference for one soda or another because students may have picked a soda based on its color, not its taste.
Chromatography separates a solution based on differences in how its components _____ in different phases of matter.
Answers
Answer:
Affinities
Explanation:
Chromatography is a laboratory technique used for separation of mixture.
In chromatography, the separation is based on different affinities of components in different phases of matter (mobile phase and stationary phase). Different chemical species have different affinities that is the electronic property of the chemical species and form bond with stationary phase.
Hence, the correct option is "Affinities".
how many orbitals are in the first energy level? A. 3 B.4 C.2 D.1
Answers
Answer:
One orbital
Explanation:
There is only one orbital in the first energy level of any atom of an element.
What is energy level?Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.
Energy of the stationary state is given as E= -R
1/n² where R
is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.
They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.
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which of the following is an acid-base indicator? Hydrochloric acid
Sodium hydroxide
Water
Phenolphthalein
Answers
can someone help me on this please ?
Answers
24. What volume of a 0.0200M calcium hydroxide is required to neutralize 35.00 mL of 0.0500M nitric acid
Answers
Answer:
THE VOLUME OF 0.200M CALCIUM HYDROXIDE NEEDED TO NEUTRALIZE 35 mL of 0.050 M NITRIC ACID IS 43.75 mL.
Explanation:
Using
Ca VA / Cb Vb = Na / Nb
Ca = 0.0500 M
Va = 35 mL
Cb = 0.0200 M
Vb = unknown
Na = 2
Nb = 1
Equation for the reaction:
Ca(OH)2 + 2HNO3 --------> Ca(NO3)2 + 2H2O
So therefore, we make Vb the subject of the equation and solve for it
Vb = Ca Va Nb / Cb Na
Vb = 0.0500 * 35 * 1 / 0.0200 * 2
Vb = 1.75 / 0.04
Vb = 43.75 mL
The volume of 0.02M calcium hydroxide required to neutralize 35 mL of 0.05 M nitric acid is 43.75 mL
The volume of 0.0200 M calcium hydroxide that would be required to neutralize 35.00 mL of 0.0500 M nitric acid will be 43.75 mL
From the equation of the reaction:
[tex]Ca(OH)_2 + 2 HNO_3 ---> Ca(NO_3)_2 + 2 H_2O[/tex]
The mole ratio of calcium hydroxide to nitric acid is 1:2.
Mole of nitric acid = molarity x volume
= 0.0500 x 35.00/1000
= 0.00175
Thus, the mole of the calcium hydroxide can be calculated as:
0.00175/2 = 0.000875
Volume of calcium hydroxide = mole/molarity
= 0.000875/0.0200
= 0.04375 L
= 43.75 mL
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is a force created by the water that is displaced by an object.
Answers
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).
Amylose is _____ chain of _________ units connected by _________ bonds. Cellulose is _________ chain of _________ units connected by _________ bonds.
a. e | D-fructose |
b. L-glucose |
c. B-1,6-glycosidic |
c. a-1,4-glycosidic |
d. a-1.6-glycosidic |
e. B-1,4-glycosidic |
f.a branched |
g. an unbrached |
h. L-fructose
Answers
Answer:
The options to the question is incomplete, it should contain
D-glucose
1. Amylose- Unbranched, D-glucose, a-1,4-glycosidic
2. Cellulose- Unbranched, D-glucose, B-1,4-glycosidic
Explanation:
Amylose is one of the two polymeric components of starch, the other being amylopectin. Amylose is a polymer, made up of glucose monomers. In the structure of amylose, it is a linear (unbranched) chain of D-glucose subunits connected by α-1,4-glycosidic bonds.
On the other hand, cellulose is another polymer of glucose that makes up the cell wall of plant cells, conferring rigidity on it. It is a complex carbohydrate made up of many glucose units. Cellulose is an unbranched (linear) chain of D-glucose units connected by B-1,4-glycosidic bonds.
Answer: The options are incomplete .
The correct one is D-glucose .
A. Amlyose is Unbranched, D-glucose,
connected by -1,4-glycosidic bond.
2. Cellulose is Unbranched chain D-glucose, connected by B-1,4-glycosidic bond
Explanation:
AMYLOSE is a polysaccharide that is made up of D glucose units which is connected by alpa 1, 4 glycosidic bond. It has a tight helical structure. It is a resistant starch that is not easily digested . It is an important animal digestive storage.
Cellulose is a polysaccharide also made up of D glucose and connected by beta 1,4 glycosidic bonds. cellulose . It is the major composition of plant cell walls. It give rigidity and strength to the cell wall.
Which of these steps would most likely be part of a lab procedure?
Write a hypothesis to answer a question.
Write a title at the top of a completed lab report.
Record the time to complete a chemical reaction.
Create a question on the cause of a chemical reaction.
Answers
Answer:
the answer is C
Explanation:
Record the time to complete a chemical reaction
The step that will be part of a lab procedure is; "Record the time to complete a chemical reaction."
A lab procedure refers to something that is done in the laboratory as part of an experiment.
If we look at the options carefully, we will notice that the only thing that is part of a laboratory experiment is "Record the time to complete a chemical reaction."
This action can be carried out in a live lab procedure.
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Convert 1.25 kg into grams
Answers
Since we are going from a larger unit to a smaller unit, we multiply.
So we multiply 1.25 by the conversion factor, which is 1,000.
This gives us 1,250 grams
fractional disstilation
Answers
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:
What is the death dependent variable?
Picture
Answers
Answer:
Dependent and independent variables are variables in mathematical modeling, statistical modeling and experimental sciences. Dependent variables receive this name because, in an experiment, their values are studied under the supposition or hypothesis that they depend, by some law or rule (e.g., by a mathematical function), on the values of other variables. Independent variables, in turn, are not seen as depending on any other variable in the scope of the experiment in question; thus, even if the existing dependency is invertible (e.g., by finding the inverse function when it exists), the nomenclature is kept if the inverse dependency is not the object of study in the experiment. In this sense, some common independent variables are time, space, density, mass, fluid flow rate[1][2], and previous values of some observed value of interest (e.g. human population size) to predict future values (the dependent variable)[3].
Of the two, it is always the dependent variable whose variation is being studied, by altering inputs, also known as regressors in a statistical context. In an experiment, any variable that the experimenter manipulates[clarification needed] can be called an independent variable. Models and experiments test the effects that the independent variables have on the dependent variables. Sometimes, even if their influence is not of direct interest, independent variables may be included for other reasons, such as to account for their potential confounding effect.
Explanation:
When the pressure of a confined gas is doubled at a constant temperature, the volume of the gas is reduced by half, this statement is an example of______
Answers
Answer:
Boyle's Law
Explanation:
Boyle's Law states that the volume of a gas is inversely proportional to the pressure of the gas at constant temperature so if the pressure goes up then the volume goes down and vice versa
By definition of Boyle's law, when the pressure of a confined gas is doubled at a constant temperature, the volume of the gas is reduced by half, this statement is an example of Boyle's law.
Definition of ideal gasBut first it is neccesary yo know that an ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other.
Gases in general are ideal when they are at high temperatures and low pressures.
Gas lawsOn the other side, the gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature, and moles.
Boyle's lawFinally, Boyle's law is one of the gas laws that relates the volume and pressure of a certain amount of gas kept at constant temperature.
Boyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant.
This means that if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.
In summary, when the pressure of a confined gas is doubled at a constant temperature, the volume of the gas is reduced by half, this statement is an example of Boyle's law.
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https://brainly.com/question/4147359?referrer=searchResultsPLEASE HELP The basic units of measurement for volume, length, and weight in the metric system are the?
Answers
Answer:
it looks like the answer that your looking for is B.
Answer:
B may be the answer.
Explanation:
7 When carbon is heated in a limited supply
of oxygen, a gas is obtained
(a)What is the name of this gas?
Write an equation for this reaction
IdState two physical properties of the gas
State niso uses of the gas
je)The gas is said to be poisonous. Why?
8(a) Using diagrams and equations, describes
how you would prepare samples of carbon
(ID oxide from - (1) Carbon (IV) oxide and
other reagents () Ethanedioic acid and
other reagents
Answers
Answer:
please mark my answer brainliest
Explanation:
its carbon monoxide
.....
Answer:co
Explanation:the compounds is carbon monoxide and it is found in fired coal it is poison for a human and it may cause death .
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In a list of the densities of common materials, the one density that might not seem reasonable is _____.
Select one: a. 0.45 g/mL
b. 35 885 g/mL
c. 1.000 g/mL
d. 2.54 g/mL
Which of the following has the greatest density?
Select one: a.
a rock
b. oil
c. oxygen
d. ice
Answers
Answer:
1. b
2. a
Explanation:
1. The density of an object represents the mass per unit volume of the object. A density of 0.45 g/mL means that 1 mL of the object weighs 0.45 g, 1.000 g/mL means 1 mL weighs 1 g, etc.
A density of 35,885 g/mL means that 1 mL of the object weighs 35,885 g. This is a ridiculously high amount of weight for an object with a volume of 1 mL and seems not reasonable. It is highly unlikely that such a substance exists in nature.
2. Considering the fact that only rock would sink in water of all the substances from a - d, it thus means that rock would have the greatest density. Oil, oxygen, and ice will all float on water, meaning that they are less dense than water.