Answer:
D. an ecosystem
Explanation:
An ecosystem is a community of living organisms (biotic factors) interacting with one another and their physical environment (abiotic factors). In an ecosystem, energy is transferred in a unidirectional manner from one organism to another when they feed on one another. For example, energy is transferred to a goat when it feeds on a plant.
Hence, this system in which energy transference occurs between the community of organisms is an ECOSYSTEM. The transfer of energy is one of the interactions between living organisms.
please help balance this equation
_B2Br6 + _HNO3= _B(NO3)3+_HBr
Answer: B2Br6 + 6HNO3 → 2B(NO3)3 + 6BrH
Equation
B2Br6+HNO3=B(NO3)3+HBr
B=2 B=1
BR=6 BR=1
H=1 H=1
N=1 N=3
O=3 O=9
ANSWER
B2Br6 + 6HNO3 → 2B(NO3)3 + 6BrH
B=2 B=2
BR=6 BR=6
H=6 H=6
N=6 N=6
O=18 O=18
HOPE THIS HELPS
A car moved 60 m East and 90 m West. What is the distance? *
the answer would be 150 m because you just add 60 and 90
which example is not an organic compound
Answer:
I think Methane.
Mark me as brainliestWhich two planets are the largest? Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Answer:
Jupiter and Saturn are the two biggest planets
True or False. Weather patterns in the US moves from the West to East across the
country.
Answer:
North America) than in the tropics. Since low pressure systems spin in a counterclockwise fashion, winds move from the west to the east, propelling weather systems to the east. Another MAJOR factor that drives weather systems in the U.S. is that the Jet Steam moves from West to East across North America.
Explanation:
I hope this helped
(Sorry If it didn't)
answer number 12 for me
Answer:
I believe its F: 2.55
Explanation:
I know I'm very late, positive you're past this question, I'd hope at least.
13. What physical property is characteristic of all of the elements in the group located in the
rightmost column of the periodic table?
A.
very high melting point
B.
gas state at room temperature
C. good conductor of electric current
D. extremely brittle solid at room temperature
Answer:
B. gas state at room temperature
Explanation:
Which of the following is the correct Lewis dot structure for F2?
Answer:b
Explanation:
Correct dot
Which element, when combined with Fluorine, would form an COVALENT compound?
A.Lithium
B.Iron
C.Phosphorus
D.Sodium
Answer:
Explanation:
A covalent compound is a compound formed by covalent bonds. A covalent bond is formed between two atoms where electrons are shared between the two atoms. This forms a molecule.
What determines whether two elements will form a covalent compound or not is the number of valence electrons present in each of the elements.
Fluorine will form a covalent compound with phosphorous because fluorine has 5 electrons in its outermost shell. It needs 3 more to become stable.
Phosphorous also has 5 valence electrons. It needs 3 more to become stable.
What happens is that 3 atoms of FLuorine combine with one atom of Phosphorus, sharing the valence electrons between themselves. This leads to the formation of the PF3 molecule.
Both the Phosphorous and the Fluorine are now stable.
Answer: Phosphorus
Explanation: since both are non-metals they would both create a covalent bond.
If 1.25 g of water is heated from 20.0 degrees Celsius to 45.0 degrees Celsius and has a specific
heat of 4.18 J/gC, how much heat energy does it contain?
Answer: Heat energy contained by water is 130.625 J.
Explanation:
Given: Mass = 1.25 g
Specific heat = [tex]4.18 J/g^{o}C[/tex]
Initial temperature = [tex]20.0^{o}C[/tex]
Final temperature = [tex]45.0^{o}C[/tex]
Formula used to calculate heat energy is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass of substance
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\= 1.25 g \times 4.18 J/g^{o}C \times (45.0 - 20.0)^{o}C\\= 130.625 J[/tex]
Thus, we can conclude that heat energy contained by water is 130.625 J.
How is our sense of vision like our sense of smell?
Answer:
Since previous studies had shown that the brain's visual center lights up with activity when someone does a purely smell-related task, a group of researchers set out to test what these two senses have to do with each other. ... The electric current startles that area of the brain into extra activity.
2. (a) Solid calcium oxide was taken in a container and water was added slowly to it:
(i) Write the observation.
PLS ANSWERR
Explanation:
(i) Two observations made in the experiment are:-
(a) Temperature is raised due to the vigorous reaction.
(b) It is an exothermic reaction, heat is observed.
(ii)
quicklime
CaO
(s)+
water
H
2
O
(l)⟶
CalciumHydroxide
Ca(OH)
2
+Δ(heat)
∴ Calcium Hydroxide is produced.
4. A typical human consumes 2500 Kcal of energy during a day. This is the equivalent to 10,450,000 J. Say you decided to run stairs all day. Given that there are: 24 hours / day • 60 minutes / hour • 60 seconds / minute = 86,400 seconds / day How much energy, in Joules, would you burn in climbing stairs all day?
Answer:
The amount of energy that would be burnt in climbing stairs all day is approximately 52,738,560 Joules
Explanation:
The question is with regards to an experiment with details that can be obtained from the U Oregon website
The given parameters of the question are;
The energy consumed by a human each day = 2,500 kcal = 10,450,000 J
The required parameters obtained from U Oregon website are;
The average weight of a student, W ≈ 60 kg × 9.81 m/s² = 588.6 N
The average time it takes a student to run up a flight of stairs = 5.4 s
The height of the stairs, h = 0.2 m × 28 = 5.6 meters
Therefore, we get;
Work done in climbing up the stares = W × h = 588.6 N × 5.6 meters = 3,296.16 J
The height the student can climb in a day is given as follows;
The time of 1 day in seconds, t = 86,400 s
The height the student climbs in 5.4 s = 5.6 m
∴ Vertical velocity, [tex]v_y[/tex] = 5.6 m/(5.4 s) = (28/27) m/s
The vertical height the student climbs in a day, [tex]h_{(v \, all \, day)}[/tex] = [tex]v_y[/tex] × t
∴ [tex]h_{(v \, all \, day)}[/tex] = (28/27) m/s × 86,400 = 89,600 m
The work done all day = W × [tex]h_{(v \, all \, day)}[/tex] = 588.6 N × 89,600 m = 52,738,560 J
The amount of energy in joules that would be burnt in climbing stairs all day = The work done all day = 52,738,560 Joules
Cecilia finds this cell under the microscope:
How does she know it is an animal cell?
A It does not have a cell wall.
B It has a cell membrane.
C It has a nucleus.
D It is round.
Answer:
all of the above options is correct because animal cell have all the mention features.
hope it helps you have a great day keep smiling be happy stay safe ☺️
Should couples wanting to start a family undergo genetic testing to minimize risk to their offspring
Answer:
Yes
Explanation:
The genetic testing is also called as the DNA testing. It is mainly used for identifying the changes in the DNA sequence or the chromosomes structure. It can also measure the results in the genetic changes.
Couples those who are planning to start a family should go for a genetic testing so as to minimize a risk in the upbringing or growth of their offspring. By doing a genetic testing a couple can well know the conditions of the baby that could affect them. The result from a genetic testing can help to plan better before starting a family. Therefore, it is advisable for couples to go for a genetic testing so that they plan better by knowing the conditions.
Galaxies are made of billions of?
Planets
Nebulas
Stars
Meteors
If 1.5 moles of NaC₂H₃O₂ are dissolved in 750g of water, what is the molality of this solution?
2.0m
1.5m
2.6m
0.9m
Answer:
2m.
Explanation:
molality = no.of moles of solute ÷ mass of solvent in kg
molalty = 1.5 moles ÷ 0.75 g
= 2m
Meera added blue copper sulphate crystals to some water in a beaker.
The copper sulphate dissolved in the water.
1 give one way meera could see that the copper sulphate had dissolved in the
Answer:
The solid crystals disappeared
Explanation:
When a soluble solid solute is added to water, the solid solute disappears after a little while. The disappearance of this solute indicates that the solute has been dissolved in water.
In this case, blue copper sulphate crystals are added to water, the blue crystals disappear leaving only a blue solution. The disappearance of these blue copper sulphate crystals indicates that the substance has dissolved in water.
A bottle of Hydrogen Peroxide is labeled 9.5% by volume. How many milliliters of H2O2 are in 480.00ml bottle of this solution
Answer:
45.6 millilitres of hydrogen peroxide are in 480.00 mL of 9.5% by volume hydrogen peroxide solution
Explanation:
A percentage solution of Hydrogen peroxide is a volume per volume percentage solution. This means that each given percentage solution is expressed as a given mL of the substance found in 100 mL of solution.
A 9.5 percentage hydrogen peroxide solution contains 9.5 mL of hydrogen peroxide in 100 mL of solution.
Millitres of hydrogen peroxide found in 480.00 mL of solution = 9.5/100 × 480 mL = 45.6 mL
Therefore, 45.6 millilitres of hydrogen peroxide are in 480.00 mL of 9.5% by volume hydrogen peroxide solution
Why does such a small decrease in pH mean such a large increase in acidity?
Answer:
pH is an index of how many protons, or hydrogen ions (H+) are dissolved and free in a solution. The pH scale goes from 0 to 14. A fluid with a pH of 7 is neutral. Below 7, it is acidic; above 7, it is alkaline.
The more below or above 7 a solution is, the more acidic or alkaline it is. The scale is not linear—a drop from pH 8.2 to 8.1 indicates a 30 percent increase in acidity, or concentration of hydrogen ions; a drop from 8.1 to 7.9 indicates a 150 percent increase in acidity. Bottom line: Small-sounding changes in ocean pH are actually quite large and definitely in the direction of becoming less alkaline, which is the same as becoming more acidic.
If you think about it, we use descriptive words like this all the time. A person who stands 5’5” tall and weighs 300 pounds isn’t thin. If he loses 100 pounds, he still won’t be thin, but he will be thinner than he was before he went on the diet. (And we are more likely to comment that he’s looking trimmer than to say he’s not as fat as he used to be.)
Which substance is an ionic solid? A. LiCl B. HCl C. Ne D. Fe
Answer:
A. LiCl
Explanation:
Lithium chloride is an ionic compound but it also has some covalent character due to the very small size of lithium metal.
Ionic solids are formed between a metal and a nonmetal. Among the given options, option A, LiCl is an example of ionic solid formed from lithium metal and chlorine.
What is ionic solid?Ionic compounds are formed between metals and non-metals. Metals are electron rich and easily loss electrons. Non metals are mostly electron deficient and gain electron from metals.
Lithium is an alkali metal with one valance electron. Cl is 17th element with 7 valence electrons. Cl needs one more electron to achieve octet. Li donates its valence electron to Cl, and gains a positive charge and Cl gains a negative charge by accepting the electron.
The opposite charges between the atoms gets attracted electrostatically forming ionic bond between them and the compound LiCl results. HCl is a covalent compound. Ne and Fe are pure metals and not ionic solids. Hence, option A ic correct.
Find more on ionic solids:
https://brainly.com/question/29629371
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Explain why uranium must be enriched to be used in a nuclear power plant.
Answer:
The nuclear fuel used in a nuclear reactor needs to have a higher concentration of the U 235 isotope than that which exists in natural uranium ore. U235 when concentrated (or "enriched") is fissionable in light-water reactors (the most common reactor design in the USA).
Explanation:
11.
The picture shows sand used to make a model of a galaxy. In the model, each grain of
sand best represents
A.
B.
a comet
a black hole
an asteroid
C.
D.
a star
Answer:
D
Explanation:
I took that.
2. Which type of energy is centered around breaking the bonds between elements in a compound?
Nuclear
Chemical
Electrical
Elastic
which chemical reaction absorbs energy?
A. photosynthesis
B. explosion
C. current produced by a battery
D. combustion of fuels
E. activated hand warmers
Answer:
A is your answer
Which of these hydrocarbons is a ketone? Check all that apply.
Answer:
The answer is below
Explanation:
Ketone is a class of organic compounds which has a carbonyl group such that the carbon atom is covalently bonded to an oxygen atom, while the remaining two bonds are to other carbon atoms or hydrocarbon radicals.
Ketones are highly reactive hydrocarbons, they can be gotten from the oxidization of secondary alcohols. Ketone are used for medicinal applications.
The third option is the ketone
it’s the the last 2 choices
~I will give the brainliest~
How does temperature affect the rate constant for a reaction?
A. increasing temperature exponentially increases the rate constant
B. increasing temperature linearly increases the rate constant
C. increasing temperature exponentially decreases the rate constant
D. increasing temperature linearly decreases the rate constant
E. temperature has no effect on the rate constant
Which elements are in the compound hydrochloric acid?
A. Helium and carbon
B. Hydrogen and carbon
C. Helium and chlorine
D. Hydrogen and chlorine
Answer:
D. Hydrogen and chlorine
Explanation:
Answer:
d
Explanation:
hydrogen and chlorine
is the compound of hydrochloric acid
eeeeeeeeeeeeeeeeeeeeeeeeeeeee
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
Have a nice day!
Answer:
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
give the other person brainliest
have a good day :)
Explanation:
Where do CFCs come from?
A:spray cans
B :fire extinguishers
C:Air conditioner
D: manufacturing foams
Or all above
Answer:
all of the above
Explanation:
Answer:
All of the above
Explanation:
Prior to the montreal CFC production ban, all of these products released CFCs into the atmosphere. Some old air conditioner still release CFC so please be sure to dispose of them as CFC kills the ozone layer.