Answer:
If an object falls from one point to another point inside a gravitational field, the force of gravity will do positive work on the object, and the gravitational potential energy will decrease by the same amount
What is the role of a consumer in the flow of energy through a food chain?
Answer:
The role of consumers in an ecosystem is to obtain energy by feeding on other organisms and sometimes transfer energy to other consumers. Changes that affect consumers can impact other organisms within the ecosystem.
Explanation:
Hope this helped Mark BRAINLIEST!!!!
Consumers are organisms that obtain energy by eating other organisms. Consumers may consume either producers or other consumers. Consumers include animals.
What is food chain ?A food chain is a network of links in a food web that begins with producer organisms and ends with an apex predator, detritivore, or decomposer species.
A food chain also demonstrates how organisms are related to one another through the food they consume. Each trophic level is represented by a different level of a food chain.
Producers can produce their own food and energy, but consumers are not the same. Consumers are living things that must hunt, gather, and eat their food.
Thus, Consumers must eat in order to gain energy, or they will perish. Omnivores, carnivores, herbivores, and decomposers are the four types of consumers.
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what is the k expression for this reaction? plz help !
Answer:
K = [HI]² / [H₂] [I₂]
Explanation:
To write the expression of equilibrium constant, K, it is important that we know how to obtain the equilibrium constant.
The equilibrium constant, K for a given reaction is simply defined as the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient. Thus, the equilibrium constant is written as follow:
K = [Product] / [Reactant]
Now, we shall determine the equilibrium constant for the reaction given in the question above. This can be obtained as illustrated below:
H₂(g) + I₂(g) —> 2HI (g)
K = [HI]² / [H₂] [I₂]
If a gas is 0.8L at 900 mm Hg and 400K, what is the new pressure if the volume decreases to 0.5L and 300K?
Answer:
The new pressure of the gas is 1080 mmHg
Explanation:
The general equation provides a way to calculate the relationship between changesnp in volume, temperature and pressure of a given mass of gas.
The general gas equation is given as P1V1/T1 = P2V2/T2
Where P1 is initial pressure of gas
V1 is initial volume of gas
T1 is initial temperature of gas
P2 is final pressure of gas
V2 is final volume of gas
T2 is final temperature of gas
From the given question, P1 = 900 mmHg, V1 = 0.8 L, T1 = 400 K, P2 = ?, V2 = 0.5 L, T2 = 300 K
Making P2 subject of the general gas equations:
P2 = P1V1T2/V2T1
P2 = (900 × 0.8 × 300) / (0.5 × 400)
P2 = 1080 mmHg
Therefore, the new pressure of the gas is 1080 mmHg.
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Answer:
The object is moving with uniform acceleration
Explanation:
Acceleration is defined as the change of speed with time. Hence, we define acceleration as ds/dt.
The slope of a speed/time graph gives us the acceleration of the moving object.
An object is said to move with uniform acceleration when the speed increases by equal amounts in equal time intervals as in the straight line speed/time graph shown in the question
A wood-burning stove is used to heat the air in a small room.
What types of heat transfer are involved?
First the burning wood inside the wood stove gives off radiation heat and transfers it into the air inside the wood stove. This hot air then heats up the metal that the wood stove is made of; the metal is heated through conduction heat transfer.
The heat of the burning wood spread in the small room via radiation and convection.
What is convection?Convection can be described as the transfer of heat from one place to another due to the movement of fluid. Convective heat transfer involves the combined processes of conduction and advection.
Gases and liquids are not good conductors of heat under normal temperature and pressure conditions, but they can easily transfer heat.
The convection takes place other through diffusion or advection but does not take place in solids, because there is no movement of its constituent particles happens. The diffusion of heat that occurs in solids is known as thermal conduction.
Heat transfer that takes place between a surface and a liquid that is in contact with the surface is known as convection heat transfer. Therefore, the heat of the wood-burning stove spread in the entire room through radiation and convection.
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help please, How much water would you need to add to the 10 grams of sodium hydroxide to make 100 grams of the 10% solution?
Answer:
90
Explanation:
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Given the following electronic configurations, identify how many valence electrons each atom has.
A=
Element
Electron Configuration
Number
of
Valence
Electrons
B =
C=
Sodium
(Na)
152 2s 2p 3s
А
DONE
Oxygen (0)
1s 2s 2p
B
Iron (Fe)
1s 2s 2p 3s 3p 452
306
С
Answer:
sodium=atomic number 11 it electronic configuration is ,K=2, L=8,M=1 Valence is 1
oxygen= atomic number 8 it electronic configuration is K=2, L=6 Valence is 2
iron= atomic number 26 it electronic configuration is K= 2 L= 8,M=8 N=6 Valence 2
Answer: A=1
B=6
C=8
Explanation:
Fe2O3(s) + H2(g) = Fe(s) + H2O(l)
jenny does the experiment above and is able to produce 595 grams of iron. how many liters of hydrogen gas would she need to accomplish this?
Explanation:
[tex]molar \: mass \: of \: iron = 56 \: g \\ 56 \: g\: are \: weighed \: by \: 1 \: mole \: of \: iron \\ 595 \: g \: will \: be \: weighed \: by \: ( \frac{595}{56} ) \: moles \\ = 10.625 \: moles \: of \: iron \\ from \: equation : \\ 1 \: mole \: of \: iron \: is \: formed \: by \: 1 \: mole \: of \: hydrogen \\ 10.625 \: moles \: will \: be \: produced \: by \: (10.625 \times 1) \: moles \\ = 10.625 \: moles \: of \: hydrogen \\ at \: s.t.p : \\ 1 \: mole \: = \: 22.4 \: litres \\ 10.625 \: moles \: = (22.4 \times 10.625) \\ = 238 \: litres \\ \\ or \: at \: r.t.p : \\ 1 \: mole \: = 24 \: litres \\ 10.625 \: moles \: = \: (10.625 \times 24) \\ = 255 \: litres[/tex]
What is the mass of 2.053 moles of silver nitrate?
Answer:
Explanation:
Silver nitrate grams to moles
1 grams Silver Nitrate is equal to 0.0058867472248402 mole
Which of the following is not a renewable source of energy?
1.) geothermal
2.) coal
3.) solar
4.) wind
2. Coal
It is non renewable energy source.
Answer: the answer would be coal
Explanation: hoped this helped!
If you dilute 250 mL of 6.4 M lithium acetate solution to a volume of 750 mL, what will the concentration of this solution be?
List 3 characteristics of mechanical waves.
Answer:
transverse, longitudinal, and surface waves.
Explanation:
there you go
What are the two groups the animal kingdom is divided into?
Answer:
Taking the animal kingdom as an example, we can see that it is split into two clear groups: Invertebrates - animals without a backbone. Vertebrates - animals with a backbone.
Explanation:
PLEASE HELP ASAP!!
WHAT IS THE CYCLE OF OZONE IN THE STRATOSPHERE?
A. UV splits an oxygen molecule into two oxygen atoms, which combine with a oxygen molecule to create ozone.
B. An ozone molecule splits into an oxygen molecule and an oxygen atom.
C. An ozone molecule forms from and then splits into two oxygen molecules and two oxygen atoms.
D. A & B
URGENT: Identify the subatomic particles that determine the atomic number of an element.
Answer:
the number of protons determines the atomic number
Explanation:
Ex. Aluminum has 13 protons, so it's atomic number is 13
hope this helps :)
What is displacement?
Answer: the moving of something from its place or position:
Explanation: hopes this helpe D:
Answer:
its a reaction where an atom or a set of atoms gets displaced get taken over by another atom
Explanation:
which of the following examples where molecules are slightly far apart
A.rock
B.water
C.smoke
D.plasma ball
Answer:
in my opinion I think is D you don't have to choose it
Anyone know this question
Balancing Equations help (please explain)
Answer:
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction.
Explanation:
correct name for Ti(SO4)2?
Answer:
Titanium(IV) Sulfide
Explanation:
Which of the following is not a covalent compound?
NH3
PbSO4
C6H12O6
OCl2
Answer:
PbSO4 is not a covalent compound.
Explanation:
PbSO4 is an ionic compound.
What pairs will form IONIC bonds?
Choices are :
A.) Na and F
B.) Mg and Ge
C.) C and O
D.) N and N
Which property would most likely be the same when comparing two random samples of copper?
A mass
O B. volume
OC weight
OD. density
Answer:
melting point and conductivity
Explanation:
as long as both samples are copper, it will melt at the same time, aswell as conduct electricity the same.
Consider the following reaction: 2 SO2(g) + O2(g) → 2SO3(g)
If the initial rate of change for sulfur dioxide is -2.00 M/min, what is the initial rate of change of oxygen?
A) -4.00 M/min
B) -1.00 M/min
C) 4.00 M/min
D) 1.00 M/min
Answer:
B) -1.00 M/min
Explanation:
Based on the reaction:
2 SO2(g) + O2(g) → 2SO3(g)
2 moles of SO2 are consumed per mole of O2 producing 2 moles SO3
In the problem, the sulfur dioxide has a rate of change of -2.00M/min. As the moles of oxygen that reacted are half the moles of SO2, its rate of change is halved, that is:
B) -1.00 M/minWhat the answer I’m on a midterm and can’t seem to find it help
Answer:
Sorry I’m not rlly sure but maybe the 2nd or the last
Explanation:
A buffer solution is prepared by adding NaC2H2O2 to a solution of HC2H2O2 (acetic acid). HC2H3O2(aq) = H+ (aq) + C2H302 - (aq) What happens if KCl is added
Answer:
pH is not been modified. No changes.
Explanation:
Our buffer is made of acetic acid, a weak one and the salt from its conjugate base, sodium acetate.
NaC₂H₃O₂ → Na⁺ + C₂H₃O₂⁻
The acetate anion can make hydrolisis in water to produce acetic acid again.
C₂H₃O₂⁻ + H₂O ⇄ C₂H₃O₂H + OH⁻ Kb
KCl is neutral salt. When we dissociate it:
KCl → K⁺ + Cl⁻
Both ions come from a strong base and a strong acid. They won't make hydrolisis in water because they are conjugate weak acid and base
K⁺ + H₂O ← KOH + H⁺
Cl⁻ + H₂O ← HCl + OH⁻
These reactions can't be possible.
That's why it doesn't occur anything in our buffer, this salt does not give OH⁻ or H⁺ to medium to modify pH
what if the solubility of KNO3 at 60 celsius?
A. 28 grams of KNO3
B. 38 grams of KNO3
C. 45 grams of KNO3
D. 108 grams of KNO3
Answer:
D. 108 grams of KNO3(Potassium nitrate)
uummm....In the chemical reaction 3H2 + N2 --> 2NH3 , how many moles of NH3 will be produced if 4 moles of nitrogen react?
Answer:
8moles
Explanation:
1 mole of N2 gives 2 moles of NH3
4 moles of N2 gives>( 4*2)/1
= 8moles of NH3
PLEASE HELP I AM BEGGING YOU!!!!!!!!
A box is pushed at a constant speed of 1.5 m/s for 12 seconds using a force of 50 Newtons across the floor. Calculate the distance the box travelled using. *
Answer:
Distance = 18 meters
Explanation:
Given the following data;
Force = 50 N
Speed = 1.5 m/s
Time = 12 seconds
To find the distance travelled;
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex]
Making distance the subject of formula, we have;
Distance = speed * time
Substituting into the formula, we have;
Distance = 1.5 * 12
Distance = 18 meters
Additionally, to find the workdone;
Workdone = force * distance
Workdone = 50 * 18
Workdone = 900 Joules