(đ) is answer of question.
Explanation:
However, the brightness of a star depends on its composition and how far it is from the planet. Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.
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Astronomers measures the luminosity of stars by determining the magnitude of brightness and distance from earth.Thus option C is correct.
What is luminosity?Luminosity of a star is the total amount of energy radiated by them to a distance. The luminosity vary from star to star based on the distance to them.
Luminosity is basically measured in terms of brightness as observed from the earth. Stars will make a group in certain shapes and certain number called constellation. The overall brightness can be then higher for each constellation.
Astronomers define the brightness of stars by the apparent distance from the earth whereas the absolute magnitude is defined is terms of standard distance of 32.6 light years. Hence, the option C based on distance and brightness is correct.
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Element X has two isotopes. One has a mass of 45.0 amu and is 45.0% abundant. The other has a mass of 47.0 amu and is 55.0% abundant. What is the average atomic mass of element X?*
0 46.1 amu
O 36.5 amu
0 43.8 amu
0 48.9 amu
The average atomic mass of element X that has two isotopes (one of 45.0 amu mass and 45% abundance and the other of 47.0 amu mass and 55.0% abundance) is 46.1 amu (option 1).
The average atomic mass (A) of element X can be calculated as follows:
[tex] A = m_{1}\%_{1} + m_{1}\%_{1} [/tex] (1)
Where:
m₁: is the mass of isotope 1 = 45.0 amu
m₂: is the mass of isotope 2 = 47.0 amu
%₁: is the abundance percent of isotope 1 = 45.0 %
%₂: is the abundance percent of isotope 1 = 55.0 %
Hence, the average atomic mass is (eq 1):
[tex] A = m_{1}\%_{1} + m_{1}\%_{1} = 45.0 amu*45.0\% + 47.0 amu*55.0\% = 45.0 amu*0.45 + 47.0 amu*0.55 = 46.1 amu [/tex]
Therefore, the average atomic mass of element X is 46.1 amu (option 1).
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A sunflower turns toward the sun to absorb the greatest amount of energy. What type
of behavior is this?
A Dormancy
B Phototropism
C Hibernation
D Gravitropism
Answser:
This sunflower must be a young one because a sunflower turns toward the sun when they are young. Once they mature they will prematurally stay facing east. with this knowledge we can exclude some of tghe answers and leave the correct one remaining. It is not C becasue sunflowers do not hibernate. They lay dormante in the winter waiting for their seeds to pop out during the spring. it is not D becasue Gravitropism is a form of facing towards or away from the pull of gravity. It is nopt A because it is to simalir to Hidernation. Dormancy is staying dormant during cool temputure and ect. So our answer must be B because Phototropism is the condition that a plant growes toward light. this is why bannanas are curved and why trees grow up. So your your answer is B Phototropism.
how do you determine the thermal energy of an object
Answer:
An object's thermal energy is dependent upon its temperature and mass. The higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy
Contrast the cause of the attraction in ionic bonds
and metallic bonds.
which reagents are appropriate to carry out the conversion shown?
A reagent us a chemical substance applied in a chemical reaction to bring about a change in the chemical reaction process. The reagent that is appropriate to carry out the conversion is Ethanol (CH3CH2OH).
Organic Reactions are reactions taking place in organic compounds and they can take various forms such as electrophilic addition reaction or nucleophilic substitution reactions.
From the assumed diagram below, the reaction takes place in an unimolecular nucleophilic reaction SN1 mechanism in which a racemic mixture produce an organic compound and an enantiomer.
For the reaction to take place, the best organic reagent to us is known as ethanol (CH3CH2OH). This is because the organic reagent is a solvent that acts as a Nucleophile.
In the reaction, bromine (Br) is the leaving group, after it detaches from the racemic compound, it forms a carbonation in which the Ethanol CH3CH2OH attacks at the carbonation site.
Therefore, we can conclude that the Reagent necessary to carry out the conversion is Ethanol (CH3CH2OH)
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Please help serious answers only
Answer:
Neptune and Saturn although Neptune isn't on there so just Saturn.
hope it'll help ya out!
Need help with #1 and #2
Answer:
To calculate half life, divide original value by 2.
1.
FOUR HALF LIVES = divide original value by 2, 4 times.
40÷ 2 = 20
20 ÷ 2 = 10
10 ÷ 2 = 5
5 ÷ 2 = 2.5g
2. AFTER TEN DAYS (TWO HALF LIVES)
140 ÷ 2 = 70
70÷ 2 = 35g
AFTER TWENTY DAYS (FOUR HALF LIVES)
140 ÷ 2 = 70
70 ÷ 2 = 35
35 ÷ 2 = 17.5
17.5 ÷ 2 = 8.75g
14. A gas in a 400 ml flask exerts pressure of 81.0 kPa at 25.0°C. If the gas
was in a 250 ml container at a pressure of 101 kPa, the temperature would be
a) - 124 °C
b) - 41.2°C
c) 20.0°C
d) 232 °C
Answer: B would be the correct answer
Explanation: You will need to use P1V1/T1=P2V2/T2
So
P1= 81.0kPa /101 =0.799atm
V1=0.4L
T1=25.0C +273.15K= 298.15K
P2= 101kPa /101 = 1atm
V2=0.25L
T2= ?
T2=P2V2T1/P1V1
(1.0atm)(0.25L)(298.15K)/(0.799atm)(0.4L) =233.22K-273.15=-39.92C
Convert 19 rabbits into jackalopes, given that 5 rabbits = 8 hares and 10 hares = 13 jackalopes.
Answer:3 9 jackalopes
Explanation: given that five rabbits are equal to eight hares and ten hares are also equal to thirteen jackalopes:
19 rabbits =31 hares by (19×8)/5 so 31hares =39 jackal by 31×13/10
A sample of aluminium has a mass of 54 gram. What is the mass of the same number of magnesium atom.
Answer:
48g of Magnesium.
Explanation:
We know that:
Mole=given mass/molar mass
Then, moles of aluminum = 54/27 = 2.
A/c to question ,
For 2 moles of magnesium it's mass is 2×24=48g.
Hence, the required mass for same number of magnesium atoms is 48g.
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Drag the item from the item bank to its corresponding match.
These are the elements or compounds that enter into a chemical reaction.
drag an
These are the substance(s) formed in a chemical reaction.
drag an
These are the reactants in the chemical equation C6H1206 +602 --> 6CO2 + 6H20
drag an
These are the reactants in the chemical equation 6 CO2 + 6H2O --> C6H1206 + 6 02
drag and
These are the reactants in the chemical equation 2 H2 + 02 --> 2 H2O
These are the reactants in the chemical equation 2 H2O --> 2 H2 + O2
Answer:
These are the elements or compounds that enter into a chemical reaction: Reactants
These are the substance(s) formed in a chemical reaction: Products
These are the reactants in the chemical equation C6H1206 +602 --> 6CO2 + 6H20: C6H1206 and 602
These are the reactants in the chemical equation 6 CO2 + 6H2O --> C6H1206 + 6 02: 6 CO2 + 6H2O
These are the reactants in the chemical equation 2 H2 + 02 --> 2 H2O: 2H2 and O2
These are the reactants in the chemical equation 2 H2O --> 2 H2 + O2: 2H2O
Someone pls help me I will make you brain
Answer: B
Explanation:
In a beaker, 300 grams of water at 80°C cools down to 20°C. Assume all the heat from the water is absorbed by 100 cubic meters of air, with a mass of 100.000 grams . What is the temperature change in the air?
Answer:
mass of water, mw = 300g = 0.3kg
∆Tw = (80 - 20) °C
volume of air, va = 100m³
mass of air, ma = 100g = 0.1kg
∆Ta = ?
H = mc∆T
Hw = mwcw∆Tw
Hw = 0.3*4200*60
Hw = 75600J
Hw = 75.6 kJ
All the above heat energy got absorbed by air,
that is; Ha = 75600J
since it's given that the heat was absorbed by a specific amount of volume of air
then specific capacity of volume of air is
then,
ca = Ha × density
ma temp
then,
Ha = vaca∆Ta
where, ca = volumetric heat capacity of air = 0.012kJ/m³°C
75.6kJ = 100m³ × 0.012kJ/m³°C × ∆Ta
75.6 = 1.2/°C × ∆Ta
∆Ta = 63°C
63°C is the temperature change in air.
answer pls asap!!!!!!
Answer:
im going to go with letter c
Explanation:
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Explanation:
Physical change is a change in which there is no change in the chemical arrangement and thus there is no redistribution of atoms. No new substances are formed. There is only change in size, shape and phase etc.
[tex]H_2O(l)[/tex]→[tex]H_2O(g)[/tex]
Chemical change is a change in which there is change in the chemical arrangement and thus there is redistribution of atoms. which leads to formation of new substances.
[tex]2Na+Cl_2[/tex]→[tex]2NaCl[/tex]
¿De que ha dependido el rapido avance en el desarollo de nuevos materiales basados en formas alotropicas del carbon?
Answer:
ano pong topik po yan
I need help with this can you help me?
Answer:
This is the answer but I'm sure from all answers. I hope my answer help you.
Pleaseee helppp!! Pleaseee
Answer:
10CO²+4H²O
Explanation:
that Brainliest me pls
show your work
5.62m =_______ cm
5310mL=_______L
85mg=_______g
2.54L=_______mL
455g= _______kg
5500mm=_________m
0.00045 m=_________cm
Answer:
5.62•100=562cm
5310mL/1000=5.310L
85mg/1000=0.085g
2.54L•1000=2540mL
455g/1000=0.455kg
5500mm/1000=5.500m
0.00045m•100=0.045cm
Explanation:Whenever the units increase, you divide. (LLS)
Whenever the units decrease, you multiply. (SSL)
what does the theory of plate tetonics state
Answer:
Plate tetonics theory is the idea that different tectonic plates, are constantly moving and changing the surface of our Earth. They can move in three ways, convergent, divergent, and transform. Seafloor Spreading is like an example of divergent movement. When the plates diverge from each other it can create various changes such as creating a new sea floor. You can use seafloor spreading as an example of the plate tetonics theory.
Explanation:
Type the formula "H2" into the Reactants box. What is the molar mass of hydrogen gas, H2?
The molar mass of hydrogen gas H₂ is 2.016 grams.
What is molar mass?The mass of a substance divided by its concentration, expressed in grams per mole (g/mol), is known as its molar mass.
Mass is the quantity of matter in a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.
The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
M = m /n
M = molar mass
m = mass of a substance (in grams)
n = number of moles of a substance
The mass of hydrogen is 1
The number of moles of hydrogen is 6.022 x 10²³
Hydrogen gas has a molar mass of 2.016 grams per mole. When two hydrogen atoms join forces to create a molecule with the formula H2, hydrogen gas is created.
Therefore, the molar mass of hydrogen gas H₂ is 2.016 grams
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Land can also be called:
A) Money and/or profit
B) Natural Resources
C) Human Resources
ANSWER ASAP PLZ???????????????????????????????????
Answer:
The answer should be A
Explanation:
Answer:
Leaving a Copper penny in vinegar until it turns green
Explanation:
the others are physical changes. when copper penny is put in vinegar, a reactive oixde layer is formed which is green in colour. namely, Cu(II) acetate.
The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.
Why does a food web have more biodiversity?
Answer:
Biodiversity is important to the stability of food webs because it increases the complexity of interactions between organisms and makes them better :')
URGENT!!!!!
The reaction of aluminum with chlorine gas is shown.
2Al+3Cl2⟶2AlCl3
How many units of aluminum chloride (AlCl3) can be produced from 30 aluminum atoms?
number of AlCl3 units: _________________
The number of units of aluminum chloride (AlCl₃) that can be produced from 30 atoms of aluminum (Al) is 30 units
The balanced equation for the reaction is given below:
2Al + 3Cl₂ — > 2AlCl₃
From the balanced equation above,
2 atoms of Al reacted to produce 2 units of AlCl₃.
With the above information, we can determine the number of units of AlCl₃ that can be produced by the reaction of 30 atoms of Al. This can be obtained as follow:
From the balanced equation above,
2 atoms of Al reacted to produce 2 units of AlCl₃.
Therefore,
30 atoms of Al will also react to produce 30 units of AlCl₃.
Thus, 30 units of AlCl₃ were obtained from the reaction.
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In a population, exponential growth
can lead to a lack of resources,
which causes the population
numbers to decline. This is an
example of:
A. a positive feedback loop
B. a negative feedback loop
C. the first law of thermodynamics
D. the second law of thermodynamics
о
Exponential growth can lead to decreasing the population size, which represents an example of a NEGATIVE feedback loop. This control mechanism (negative feedback) is common in nature.
Negative feedback is a homeostatic self-regulatory process by which the output of a given system is fed back in order to reduce its internal fluctuations.
In a negative feedback, an amplified output from the system (e.g., in this case, a sudden increased population size) leads to its self-inhibition.
This control mechanism (negative feedback loop) helps to maintain the homeostatic balance of the entire system in order to reach a set point.
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what type of nuclear
Answer:
fussion
your welcome
Which of the following pairs of elements could NOT react to form an ionic compound ? Check all that apply
Co and Br
C and O
K and F
Ag and O
Answer:
Ag and o
Explanation:
because they are not metals but not metals
Which layer or layers of Earth provide the heat and energy that fuels convection?
The layer of Earth which provide transfer from the white core to the lithosphere that fuels convection is the mantle.
What is the Mantle layer?A mantle can be described as a layer inside a planetary body bounded above a crust and below a core. Mantles are composed of rock or ice and are usually the largest massive layer of the planetary body.
The mantle layer of the earth is a layer of silicate rock between the crust and the outer core. The mass of the mantle of 4.01 × 10²⁴ kg which is 67% of the mass of the Earth. It's a thickness of 2,900 kilometers making up about 84% of Earth's volume.
The mantle layer is predominantly solid, but it behaves as a viscous fluid. At mid-ocean ridges, partial melting of the mantle produces oceanic crust, and at subduction zones, partial melting of the mantle produces continental crust.
The temperatures range of the mantle from 200 °C at the upper boundary with the crust to 4,000 °C at the core-mantle boundary. The convection of the mantle is a chaotic process, the mantle transfers heat that fuels convection.
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Which of the following are products of combustion?
liquid and solid water
newly discovered elements
additional atoms
heat and light
The answer option which are products of combustion is: D. Heat and light.
In Chemistry, there are five (5) main types of chemical reaction and these include;
Combination reaction.Double-replacement reaction.Decomposition reaction.Single-replacement reaction.Combustion reaction.A combustion reaction can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
An example of a combustion reaction is the burning of forest trees and plants.
In conclusion, the products of combustion are heat and light.
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Answer:
heat and light
Explanation:
Explain how heat gets transferred?
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation.