Atoms in a metallic substance are held together by a force called the metallic bond.
What is metallic bonds?The metallic bond is a force that holds the atoms of a metallic substance together. In such a solid, atoms are closely spaced. The outermost electron shell of each metal atom often overlaps with a large portion of its close neighbors.Metallic chemical bonds are created by the electrostatic attraction of conduction electrons and positively charged metal ions. It is possible to imagine free electrons being shared among positively charged ion structures.Ions with opposing charges electrostatically attract one another to form ionic bonds, sometimes referred to as electrovalent bonds, in chemical molecules. A bond of this type is formed when the valence (outermost) electrons of one atom are irreversibly transferred to another atom.Ionic bonding, a type of chemical bonding that involves the electrostatic attraction between two atoms or ions with radically different electronegativities, is the primary interaction in ionic compounds.To learn more about metallic bonds refer to:
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6. The function of the general adaptation syndrome (GAS) is to...
a) Return the body to a state of homeostasis.
b)
Enable the body to deal with increasing amounts of stress.
c) Increase the body's awareness of the stress response.
d) Change the body's response to stress.
Explanation:
C) increase body's awareness of the stress response
The function of the general adaptation syndrome (GAS) is to:
d) Change the body's response to stress.
The general adaptation syndrome (GAS) is a three-stage model that describes how the body responds to stress. The first stage is the alarm reaction, which is when the body releases hormones such as cortisol and adrenaline in response to a perceived threat. The second stage is the resistance stage, which is when the body tries to adapt to the stressor. The third stage is the exhaustion stage, which is when the body's resources are depleted and it can no longer cope with the stressor.
The function of GAS is to change the body's response to stress so that it can better cope with future stressors. This is done by increasing the production of stress hormones, such as cortisol, and by increasing the body's ability to use glucose for energy.
So the answer is (d) Change the body's response to stress.
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a microwave has a length of 20mm what is its frequency
As stated in the preceding statement 20 mm microwaves operate at a frequency of 15 GHz.
How is frequency determined?There are several ways to quantify frequency, including Counting: The number of times a recurring event occurs within a given time period is counted, and the number is then divided by the duration of the time period to determine the frequency of the occurrence.
Briefing:λ= 20 mm = 20×10⁻³ m
v=3 x 10⁸ m /s (In a vacuum, all electromagnetic waves move at the speed of light, which is 3 x 10⁸ m /s.)
3 x 10⁸ m /s= f × 20×10⁻³ m
3 x 10⁸ m /s÷20×10⁻³ m= f
1.5×10¹⁰ Hz= 15×10⁹ Hz= 15 GHz
20 mm microwaves have a 15 GHz frequency.
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How much heat must be absorbed by a 17.0 g sample of water to raise its temperature from 25.0 oc to 53.5 oc?
The heat absorbed by a 17.0g sample of water to raise its temperature from 25°C to 53.5°C is 2034.
The heat absorbed by the water is :
Q = mCΔT
here : Q = amount of heat absorbed ( in joules)
m = mass of the given sample ( in grams)
C = specific heat capacity of the given sample
[ for water, specific heat capacity is 4.2 [tex]\frac{J}{gC}[/tex]
ΔT = change in temperature ( final temperature - initial temperature)
calculation:
Q = 17 × 4.2 × ( 53.5 - 25.0 )
Q = 2034.9J
result :
The heat absorbed by the sample is 2034.9 J
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What is the difference between a nucleus in Biology and Chemistry?
Answer:
:)
Explanation:
The nucleus in biology is usually referring to that of
living cells found in organisms in which contains DNA whereas the nucleus in chemistry is usually referring to that of atoms in which contains subatomic particles such as the proton and neutron.
A radioactive element has a half life of 10 days how many days would it take for 1000 grams of it to decay to 125 grams
A radioactive element has a half life of 10 days then there are 7 days would it take for 1000 grams of it to decay to 125 grams .
Calculation ,
radioactive element has a half life = 10 days ( given )
Kt = 0.069
K = 0.069 / t
K = 0.069 / 10 days = 0.0069
Kt = ㏑a/a-x
where ,
a = concentration of radioactive element at time 0 = 1000 grams
a-x = concentration of radioactive element at time t = 125 grams
Putting the value of a , a- x and K in equation ( i ) we get ,
0.0069 × t = ㏑1000 grams/125 grams = ㏑8 = 2.07
t= 2.07 / 0.0069 = 7 .05 days or 7 days
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The number 6 that he put in from of the O2, CO2, and H2O is called a:
superscript
coefficient
subscript
The number 6 that he put in from of the [tex]O_{2}[/tex] , [tex]CO_{2}[/tex] , and [tex]H_{2} O[/tex] is called a coefficient .
So , second option is correct one .
In chemistry, coefficient is a number used in chemical equations, simply as a prefix of chemical formula to define the number of molecules reacting and creating in a reaction. This is similar to how in mathematics, coefficient is the number used in front of a variable.
When dealing with concentration terms in a chemical equation, coefficients are crucial to the equation's stability. In order to ensure that the law of conservation of mass is being obeyed, we add coefficients to the equation to make it balanced.
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One reason that explains the need for the isomerization step in the citric acid cycle is that _
One reason that explains the need for the isomerization step in the citric acid cycle is that citrate is a tertiary alcohol, which cannot be oxidized.
Citric acid cycle is the main source of energy for a living organism.
Citrate is isomerized to isocitrate by dehydration and rehydration. The enzyme aconitase catalyzes this step (see picture below).
Tertiary carbon (3°) withy hydroxyl group (-OH) is attached to three other carbons.
Tertiary carbon cannot be oxidized, while secondary carbon in isocitrate can. Isocitrate is secondary alcohol.
Secondary carbon (2°) is attached to two other carbons.
Primary carbon (1°) is attached to only one carbon.
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What is the force used with a centrifuge to rapidly separate the precipitate from the liquid?.
Centrifugal force (centripetal acceleration) is used with a centrifuge to rapidly separate the precipitate from the liquid.
What is a centrifuge?
According to particle size and density, medium viscosity, and rotor speed, particles suspended in a liquid are separated using a centrifuge. Gravitational forces within a solution cause particles with densities greater than the solvent to sink and those with densities less than the solvent to float to the top.
Using the centrifugal force to separate particles found in a solution, centrifugation is a mechanical technique for separation. Depending on the size, shape, density, and rotor speed of the particles, different groups are created.
Thus, A centrifuge is used to quickly separate the precipitate from the liquid using centrifugal force (centripetal acceleration).
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How is phosphorylation of glyceraldehyde 3-phosphate in the payment phase of glycolysis different from phosphorylation of glucose in the preparatory phase?
In the preparatory phase of glycolysis, two molecules of ATP are invested and the hexose chain is cleaved into two triose phosphates. During this, the phosphorylation of glucose and its conversion to glyceraldehyde-3-phosphate take place. During this phase, the conversion of glyceraldehyde-3-phosphate to pyruvate and the coupled formation of ATP take place. Because Glucose is split to yield two molecules of D-Glyceraldehyde-3-phosphate, each step in the payoff phase occurs twice per molecule of glucose.
Glyceraldehyde 3-phosphate dehydrogenase Simultaneous oxidation and phosphorylation of G3P produce 1,3-bisphosphoglycerate (1,3-BPG) and nicotine adenine dinucleotide (NADH).
The divalent cation also affected the response of the enzyme from the endosperm and shoots to adenine nucleotides and inorganic pyrophosphate.
This phase is also called the glucose activation phase. In the preparatory phase of glycolysis, two molecules of ATP are invested and the hexose chain is cleaved into two triose phosphates. During this, the phosphorylation of glucose and its conversion to glyceraldehyde-3-phosphate take place. Steps 1, 2, 3, 4, and 5 together are called the preparatory phase.
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If an automobile air bag has a volume of 11.6 ll , what mass of nan3nan3 (in gg ) is required to fully inflate the air bag upon impact? assume stp conditions.
22.3 g of NaN₃ are required to fully inflate an airbag of 11.6 L at STP.
To find the mass, the given data was,
Volume = 11.6 Liters
What is decomposition reaction?A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
In airbags, sodium azide decomposes to form sodium and nitrogen gas, which inflates the bag. The decomposition reaction is:
2 NaN₃ ⇒ 2 Na + 3 N₂
We can calculate the mass of NaN₃ needed to produce 11.6 L of N₂ at STP, using the following relations.
At STP, 1 mole of N₂ occupies 22.4 L.The molar ratio of N₂ to NaN₃ is 3:2.The molar mass of NaN₃ is 65.01 g/mol.Substituting all the known values to find the volume,
11.6 × ( 1 / 22.4) × ( 2/3) × ( 65.01 / 1)
= 22.4 g.
22.4 g of NaN₃ are required to fully inflate an airbag of 11.6 L at STP.
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When an ionic compound is added to water, the will be attracted to the partially positive h atom of water and the will be attracted to the partially negative o atom of water. As the compound dissolves the ions separate from each other, or.
Answer:
Ionic compounds dissolve in water because the water molecules hydrate the ions.
Explanation:
To dissolve an ionic compound, the water molecules must be able to stabilize the ions that result from breaking the ionic bond.
They do this by hydrating the ions.
Water is a polar molecule. It has a permanent dipole.
The
O
atom has a partial negative charge, and the
H
atoms have a partial positive charge.
When an ionic compound is added to water, the anion is attracted to partially positive hydrogen atom of water and cation is attracted to partially negative oxygen atom of water.
What is an ionic compound?Ionic compound or electrovalent compound is a type of compound which is formed between the two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.
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body systems chart & functions can someone help me I will give brainlest
Answer:
System:
Integumentary System
Major structures:
epidermis, dermis, hypodermis, associated glands, hair, and nails.
Functions:body temperature regulation, cell fluid maintenance, synthesis of Vitamin D, and detection of stimuli.
Assciated diseases:
Acne. What is acne? ...
Alopecia Areata. What is alopecia areata? ...
Atopic Dermatitis. What is atopic dermatitis? ...
Epidermolysis Bullosa. What is epidermolysis bullosa? ...
Hidradenitis Suppurativa (HS) ...
Ichthyosis. ...
Pachyonychia Congenita. ...
Pemphigus.
System:
Muscular system:
Major structures:
skeletal, smooth, and cardiac muscle.
Functions:
Muscles, attached to bones or internal organs and blood vessels, are responsible for movement
Asscoiated dieseases:
Musculoskeletal Disorders. Muscle Strain. Tendinitis. Carpal Tunnel Syndrome.
Neuromuscular Disorders. Muscular Dystrophy. Myasthenia Gravis. Parkinson's Disease. Feature: Human Biology in the News.
System: Skeletal
Major structures:
hydrostatic skeleton, exoskeleton, and endoskeleton.
functions:
It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals.
Associated diseases:
Osteoporosis. This common disease occurs when bones become weak due to changes in bone mineral density and mass, causing a higher risk for fractures. ...
Fracture. ...
Scoliosis. ...
Paget's disease. ...
Osteoarthritis. ...
Rheumatoid arthritis. ...
Gout. ...
Bursitis.
System:
Nervous System
Major structures:
he central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
Functions:
transmits signals between the brain and the rest of the body, including internal organs.
Associated diseases:
Infections, such as meningitis, encephalitis, polio, and epidural abscess
System:
Endocrine system
Major structures:
hypothalamus.
pituitary.
thyroid.
parathyroids.
adrenals.
pineal body.
the ovaries.
the testes.
Functions:
Makes hormones that control your moods, growth and development, metabolism, organs, and reproduction.
Associated diseases:
Acromegaly.
Adrenal Insufficiency & Addison's Disease.
Cushing's Syndrome.
Cystic Fibrosis link.
Graves' Disease.
Hashimoto's Disease.
System:
Circulatroy system
major structures:
the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic
Functions:
carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
Associated diseases:
Aneurysms. Aneurysms are weak spots in the walls of your arteries that can expand like a balloon. ...
Arrhythmias. ...
Blood pressure conditions. ...
Cardiomyopathy. ...
Congenital heart disease. ...
Heart failure. ...
Heart valve disease. ...
High cholesterol.
THERE FINALLY HOPE THIS HELPS :)))
Explanation:
What mass of oxygen is required to react with calcium to produce 44.8 g calcium oxide?
The mass of oxygen required to react with calcium to produce 44.8 g of calcium oxide is 12.79 grams.
The reaction between Calcium and Oxygen produces calcium oxide which is represented as
2Ca + O2 = 2CaO
According to the above reaction
1 mole of O2 produces 2 moles of CaO
Or 112 grams of CaO is produced by 32 grams of O2
1 gram of CaO is produced by 32/112 grams of O2
Hence 44.8 g of CaO is produced by 32/112 x 44.8 = 12.79 grams of O2
Therefore, the mass of oxygen required to react with calcium to produce 44.8 g of calcium oxide is 12.79 grams.
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A+gaseous+mixture+of+o2+and+n2+contains+38.8+%+nitrogen+by+mass.+what+is+the+partial+pressure+of+oxygen+in+the+mixture+if+the+total+pressure+is+465+mmhg+?
A gaseous mixture of O₂ and N₂ that contains 38.8% nitrogen by mass, with the total pressure of 465 mmHg, has a partial pressure of oxygen of 270 mmHg.
The total pressure of an ideal gas mixture is the sum of the partial pressures of the gases in the mixture.
total pressure = 465 mmHg
m(N₂) = 38.8 g; mass of the nitrogen
n(N₂) = m(N₂) ÷ M(N₂)
n(N₂) = 38.8 g ÷ 28 g/mol
n(N₂) = 1.385 mol; amount og nitrogen gas
m(O₂) = 61.2 g; mass of oxygen gas
n(O₂) = m(O₂) ÷ M(O₂)
n(O₂) = 61.2 g ÷ 32 g/mol.
n(O₂) = 1.9125 mol; amount of oxygen gas
Using Dalton's law:
p(O₂) = (1.912 mol / 1.912 mol + 1.385 mol) × 465 mmHg
p(O₂) = 270 mmHg; pressure of the oxygen gas
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What is the density of an object that weighs 30.73 g that when added to a graduated cylinder filled with 50.0 ml of water, if the final volume is 60.7 ml?
The density of the object that weighs 30.73 g is: 2.87 g/ml
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
m = 30.73 gv1 = 50.0 mlv2= 60.7 mlv(total)=?d=?Calculating the total volume we get:
v(total)= v2 - v1
v(total)= 60.7 ml - 50.0 ml
v(total)= 10.7 ml
Applying the density formula, we get:
d = m/v
d = 30.73 g/ 10.7 ml
d = 2.87 g/ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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You are holding two balloons of the same volume. One balloon contains 1. 0 g of helium. The other balloon contains neon. What is the mass of neon in the balloon?.
The mass of neon in the balloon is 5.045 grams.
m(He) = 1.0 g; mass of balloon with helium
M(He) = 4.0 g/mol; molar mass of helium
M(Ne) = 20.18 g/mol; molar mass of neon
m(Ne) = ?; mass of balloon with neon
If the balloons have the same volume, mass of the balloons depand on molar mass of gases.
m(He) / m(Ne) = M(He) / M(Ne)
1.0 g / m(Ne) = 4.0 g/mol / 20.18 g/mol
m(Ne) = 20.18 g / 4.0
m(Ne) = 5.045 g; mass of balloon with neon
Mass is a fundamental measure of the amount of matter in the object.
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i have to do a presentation on my favorite element on the periodic table. which element is the easiest to use?
Answer: Oxygen or Nitrogen
Explanation:
We know the most about these elements because both of these elements are some of the most abundant on Earth.
Suppose the beam consists of neutrons (mc2 = 939565413 ev) with the same wave length. What is the kinetic energy of each neutron?
The kinetic energy of each neutron will be 1.953 × 10⁻¹⁹ Joules.
The formula of kinetic energy can be given as :
kinetic energy = 1/2 mv²
The formula of momentum is given as :
p = mv.....eq.1
So, combining both formulas, we can write :
K.E. = m²v²/2m = p²/2m..... eq.2
According to de Broglie, we know that,
λ = h/mv ( p=mv ), (λ = wavelength)
so, p = h/λ..... eq.3
In continuity with the eq...2
K.E. = p²/2m = (h/λ)²/2m = h²/2λ²m
h = 6.626 × 10⁻³⁴ Joule.seconds
mc² = 939565413 ev (given)
m × (3 × 10⁸)² = 939565413 × 1.60218 × 10⁻¹⁹
m = 1.673 × 10⁻²⁷kg
Again,
Kinetic energy = h²/2λ²m
= 6.626 × 10⁻³⁴/ 2 × (2.592 × 10⁻¹¹)² × (1.673 × 10⁻²⁷)....eq.4
After solving the above equation 4, we get :
K.E. = 1.953 × 10⁻¹⁹ Joules.
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WILL GIVE BRAINLIEST
A student measures the mass of a bag of sand to be 9,321 g. What is the bag's mass
in kg?
Answer: 9.321 kg
Explanation:
1,000 g=1 kg
9,321 g * 1 kg/1,000 g=
9,321 * 1/1,000=
9,321/1,000=9.321 kg
Balance the following chemical equation (if necessary): c3h8(g) o2(g) ---> co2(g) h2o(g)
The Balanced equation is:
[tex]C_3H_8 (g) + 5O_2 (g) \rightarrow 3CO_2 (g) + 4H_2O (g)[/tex]
A balanced equation of a chemical reaction is said to be so if both the products and the reactants have the same number of atoms and total charge for each component of the reaction. In other words, either side of the chemical reaction have an equal balance of mass and charge.
The inclusion of stoichiometric coefficients to the products and reactants is necessary to have balanced equations. This is significant because an equation must adhere to the laws of conservation of mass as well as constant proportions, meaning that both the reactant and product sides of the equation must include the same quantity of atoms of each element.
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What is (are) the product(s) in this reaction?
Answer: A
Explanation:
The arrow points towards what the finishing product is when you combine them, So H2CO3 would be the product.
I'm not amazing at this because I learned it 2 years ago lol, but that's my best educated guess. I hope it works!!
Curtis wanted to measure the volume of a rock using the method shown above. Which of the
following Sl units should he use?
A. grams
B. meters
C. milliliters
D. kilometers
Answer:
A. grams
Explanation:
Grams and milliliters are used to measure mass while meters and kilometers are used to measure distance. The mass of an object is the volume of it. Milliliters are used for liquids while grams are used for solids. Hence, grams is the answer.
The phenomenon of waves changing direction as they approach the shoreline is known as ________.
The phenomenon of waves changing direction as they approach the shoreline is known as Wave refraction.
What is wave refraction?Refraction is the change in direction of waves as they move between materials with different properties. In Physics, when the speed changes the direction of wave passes from one medium to the another medium.Like wise, Water waves are refracted as they move from deep water to shallow water. Water waves travel faster in deep water than in shallow water.The wave refraction gets the changes in direction as it slows down because of reaching the shore line. In shallower water near the coast, waves slow down because of the force exerted on them by the seabed.
And the phenomenon of waves changing in the direction as they approach the shoreline is known as Wave refraction.
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What+mass+of+nh3+is+required+to+produce+125+g+of+no2+if+the+percentage+yield+for+the+reaction+is+67.2%?+enter+your+answer+in+grams+and+without+units.
The mass of ammonia is 68.74 grams.
Balanced chemical equation for reaction of ammonia and oxygen:
4NH₃ + 7O₂ → 4NO₂ + 6H₂O
m(NO₂) = 125 g; the mass of nitrogen(IV) oxide
n(NO₂) = m(NO₂) ÷ M(NO₂)
n(NO₂) = 125 g ÷ 46 g/mol
n(NO₂) = 2.72 mol; amount of nitrogen(IV) oxide
From the chemical equation: n(NO₂) : n(NH₃) = 1 : 1
n(NH₃) = 2.72 mol
the percentage yield = 67.2% ÷ 100%
the percentage yield = 0.672
m(NH₃) = n(NH₃) × M(NH₃) ÷ the percentage yield
m(NH₃) = 2.72 mol × 17 g/mol ÷ 0.672
m(NH₃) = 68.74 g; mass of ammonia
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Help, please!! Been stuck on this question. Is it only neutral?
Answer:
neutral
Explanation:
.....................
What is the difference between a suspension and a solution?
a. A suspension is more concentrated than a solution.
b. A suspension is less concetrated than a solution
c. A suspension is heterogeneous while a solution is homogeneous
d. A suspension is homogeneous while a solution is heterogeneous.
plss answer correctly
Answer:
C
Explanation:
Solutions are mixtures that are homogeneous while suspensions are mixtures that are heterogeneous.
A compound consists of three times as many moles of chlorine as unknown metal m. Metal m contains 23 electrons and 31 neutrons when it forms this compound. What is the mass number of m?.
The mass number of metal M is 57.
Molecular formula of a compound is MCl₃, because chlorine has oxidation number -1 and metal +3.
Chlorine atom has atomic number 17 (17 protons and 17 electrons). When it gains one electron, it becomes chlorine anion Cl⁻ (negative charge), with 17 protons (positive electric charge of +1e elementary charge) and 18 electrons (negative one elementary charge).
Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.
As a cation, metal has 23 electrons, and as an atom three electrons more 26. It has 26 protons.
The mass number (A) is sum of the number of protons and the number of neutrons in atom.
N(n°) = 31; number of neutrons in metal atom
N(p⁺) = 26; number of protons in metal atom.
A = N(n°) + N(p⁺)
A = 31 + 26
A = 57; the mass number of metal
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How does an increase in the temperature of a chemical reaction affect the reaction rate? the reaction rate decreases. the reaction rate increases. the reaction rate does not change.
The reaction rate increases with increase in Temperature.
The average velocity of the particles increases as the temperature rises. These particles' average kinetic energy is likewise raised. As a result, because the particles move faster and encounter more reactant particles, they will collide more frequently. However, this is only a small portion of the rationale for the rate hike. Just because particles collide more frequently is not guarantee that the reaction will occur.
The main impact of increasing the temperature is that more of the particles that collide will have the necessary energy to collide effectively. In other words, more particles will have the activation energy required.
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92. Round the answer for each problem to the correct
number of significant figures.
a. (7.31 × 104) + (3.23 × 10³)
b. (8.54 x 10-3) - (3.41 x 10-4)
c. 4.35 dm x 2.34 dm x 7.35 dm
d. 4.78 cm + 3.218 cm + 5.82 cm
e. 38,736 km + 4784 km
The correct significant figures are;
a. (7.31 × 10⁴) + (3.23 × 10³) = 7.633 x 10⁴
b. (8.54 x 10⁻³) - (3.41 x 10⁻⁴) = 8.199 x 10⁻³
c. 4.35 dm x 2.34 dm x 7.35 dm = 74.81565 dm³
d. 4.78 cm + 3.218 cm + 5.82 cm = 13.818 cm
e. 38,736 km + 4784 km = 43,520 km
What is significant figures?Significant figures are used to establish the number which is presented in the form of digits.
Solution of the given problems in correct significant figures;
a. (7.31 × 10⁴) + (3.23 × 10³) = 76,330 = 7.633 x 10⁴
b. (8.54 x 10⁻³) - (3.41 x 10⁻⁴) = 8.199 x 10⁻³
c. 4.35 dm x 2.34 dm x 7.35 dm = 74.81565 dm³
d. 4.78 cm + 3.218 cm + 5.82 cm = 13.818 cm
e. 38,736 km + 4784 km = 43,520 km
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I need help asap! It’s the scale model of the solar system project on science.
A scale model of the solar system can be defined as the small representation of the real solar system. A scale model mimics the real solar system with the sun at the center and nine planets revolving around the sun.
What benefits can scale models have for those studying the solar system?
Using this scale model, it is possible to comprehend space distances, the sizes of the planets and the sun in relation to one another, space travel periods, and the separation of the planets from one another as they orbit the sun.
What is Astronomical Unit(A.U.)?Approximately 93 million miles or 150 million kilometers between Earth and the Sun. The Astronomical Unit (A.U.) is the name given to this distance because it is so significant to humans living on Earth. One astronomical unit separates the Earth from the Sun.
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