Answer:
Explanation:
Decomposers get nutrients and energy by breaking down dead organisms and animal wastes. Through this process, decomposers release nutrients, such as carbon and nitrogen, back into the environment. These nutrients are recycled back into the ecosystem so that the producers can use them.
Would you expect the heterogeneous method to give a higher percent nickel or a lower percent nickel than the homogenous method? Explain your answer.
(From the Quantitative Determination of Nickel in a Compound By Gravimetric Analysis lab)
Answer:
Heterogeneous method
Explanation:
In general, a gravimetric method of analysis consists
of the following steps:
Weighing and dissolving the sample in the proper solvent.
Carrying out a sequence chemical reactions to obtain a suitable product.
Determining the mass of the product
Calculating the composition of the sample rom mass of product and information about the original sample.
Precipitates obtained by heterogeneous methods are often difficult to filter and are always contaminated by adsorbed and occluded impurities which ultimately increase the percentage yield of nickel due to occluded impurities.
why do you think the experimenter conducted this experiment in a lab rather than in the natural world, where this phenomenon was first observed?
Answer:
The experimenter observed this experiment in a lab rather than natural world because it might be dangerous to the atmosphere if he does the experiment in the natural world and it was still an hypothesis so that's why he did it in the lab.
What is a good description of potential energy? (1 point)
energy of reaction
stored energy
energy of motion
conserved energy
please help me asap!!
Answer:
I think the answer is stored energy
Explanation:
The energy that an item has stored inside it as a result of its location in relation to a zero point is known as potential energy. If an item is placed at a height above the zero height, it has gravitational potential energy. A good description of potential energy is stored energy.
What is potential energy ?Potential energy is the power that an item may store due to its position in relation to other things, internal tensions, electric charge, or other circumstances.
The energy released during a chemical reaction is known as chemical potential energy. It is the energy that was accumulated before chemical fusion. Crackers, a charged battery, etc. are a few examples.
Potential energy has a simple definition, It is a type of energy that possesses the ability to perform work but is not now performing work or exerting any force on any other things. In other words, potential energy concerns object positions rather than object movements.
Thus, option B is correct.
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A standard weight used to calibrate balances has a mass of 100.00 g and a volume of 12.0 mL. What is the density of this standard weight in g/mL?
88.0 g/mL
8.33 g/mL
0.12 g/mL
7.33 g/mL
Answer:
The answer is 8.33 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 100 g
volume = 12 mL
We have
[tex]density = \frac{100}{12} = \frac{25}{3} \\ = 8.333333...[/tex]
We have the final answer as
8.33 g/mLHope this helps you
6) Andy has left a bucket of smelly cheese porridge to cool down in the
Kitchen
a) Claire and Dagmar are sitting in the next room. Explain how the smell spreads to Claire's nose by diffusion.
hello!can anyone help?
Explanation:
the air particales are always moving so it also takes the smell of the chesse with it and sreads everywhere in the house.
6. Since the valves act as the doors of the heart, what might happen if these
doors do not close?
Answer:
If the valves of the heart do not close, the blood will flow backwards. Blood will escape back into the chambers rather than flowing forward through the heart or into an artery.
Explanation:
13. Based on the type of elements in the compound, are there ionic or covalent?
a. KCI
b. NO2
C. Cao
d AIF3
e. HF
f. NBr3
g. MgBr2
Answer:
c
Explanation:
Answer:
《●《HOPE IT HELPS YOU 》●》
ANS--> (C)
how would it affect your results if you use a wet Erlenmeyer flask instead of a dry one when transferring your acid solution from a volumetric pipette? pls someone answer pls
Explanation:
Your results would be effected because there is a possibility that the water and chemical substance added into the flask will combine, possibly creating a reaction, either making the solution stronger or weaker, or possibly just messing up your experiment in one go.
For example:
If I paint a picture, and I have a cup that I use in order to put paint in, but the cup is wet and I put my paint in it, my paint will become more liquefied due to the fact water has been added to it, messing the paint up.
Which specific reaction can turn iron molten (liquid) as soon as it is formed?
Answer:
Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)
Explanation:
Iron is extracted in a blast furnace. The temperature inside the blast furnace goes a s high as 2000 degrees centigrade.
The iron III oxide ore fed into the furnace reacts with carbon II oxide obtained by the reduction of carbon IV oxide by coke yielding liquid iron and carbon IV oxide
what is the molecular mass of Au
Answer:
196.96657 u
Explanation:
He is chemical symbol for which element
A)helium
B)hafnium
C)hassium
D)hydrogen
Answer:
it is helium so A.........
He is the chemical symbol for Helium.
How many moles are in 75.0 grams of K2S?
Answer:
0.6802 mol
Explanation:
1 grams K2S = 0.00907 mol
0.00907 x 75 = 0.6802 mol
Some household cleaners come in concentrations stronger than necessary for basic cleaning jobs. Jeremy followed the instructions on a cleaning bottle and mixed enough cleaner with 4.0 L of water to form a 1.0 M cleaning solution. After testing his cleaning solution, he decided he should double to concentration for a tough stain. Jeremy added the same amount of cleaner and then added another 4.0 L of water to his bucket. Did Jeremy succeed in making a more concentrated solution? Explain why or why not. *
Answer:
no he just repeated the steps and made more of the same cleaner my guy
Explanation:
The majority of the mass of the atom is located in the___
Answer:
Nucleus
Explanation:
Since electrons are 1/1840 of the weight of a proton or a neutron, all of which are in the nucleus, scientists often don't include them.
1. Which of the following substances are elements? Explain
how you determined your answer.
(a) bronze
(b) tin
(C) chromium
(d) solder
(e) propane
(f) arsenic
(g) nickel
Substances that can be regarded as elements are;
Tin
Chromium
Arsenic
Nickel .
Chemical elements can be regarded as substance that are required to form compounds in chemical reactions.The elements in this question are Tin ,Chromium ,Arsenic ,Nickel, i can know this by checking the periodic table which gives the arrangements of all elements.Solder, Bronze can be regarded as alloy because it contains more than one metal element. Propane is a compound.Therefore, periodic table contains all the elements.
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Mercury has a density of 13.6 g/mL. What is the volume occupied by 112.0 grams of mercury?
Answer:
The answer is 8.24 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 112 g
density of mercury = 13.6 g/mL
We have
[tex]volume = \frac{112}{13.6} \\ = 8.23529411...[/tex]
We have the final answer as
8.24 mLHope this helps you
Which formula represents hydrofluoric acid?
HFO
H2F
HFO 4
HF
Answer:
it's HF
Explanation:
Scientific experiments are specially designed to evaluate explanations for an observed phenomenon. A student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student will carry out the experiment using two identical plants that will only spend different amounts of time in sunlight. All other aspects necessary for growth will remain identical for each. In the experiment described, what would be the amount of water given to each plant?
Answer:
This question lacks options, the options are:
a. an observation
b. a dependent variable
c. an independent variable
d. a control
The answer is D. Control
Explanation:
According to the question, a student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student keeps all other variables needed for the plants' growth in this experiment the same/identical. These variables kept identical by the student is called CONTROL OR CONSTANT.
One of the CONTROL is the amount of water given to each plant. The amount of water given to the two plants being tested must be the same. Hence, WATER in this experiment is a CONTROL VARIABLE.
Note that, the independent/manipulable variable is the amount of time spent in sunlight while the dependent/measurable variable is the growth of the plants.
Answer:
The answer is D control
Explanation:
(PLS HELP WORTH 50 POINTS)
Click or tap the storage container to transfer the displaced water to the 500 mL graduated cylinders, and determine
how much water was displaced by the football. Record this volume in Table B.
Answer:
there would be 4,300mL of diplaced water
for this all your expected to do is to add all of the volume in the containers together.
The gravitational force acting on an object is also called the object's _____. A) mass B) weight C) density D) volume
Answer:
B) weight
Thats it no explanation
Answer:
B) weight
Explanation:
Weight is gravity's pull on an object. This would change if you went to the moon. Gravitational
Mass is the amount of the object. This would stay the same if you went to the moon. Non-gravitational
Bob rides his motorcycle with a constant speed of 116 km/h. How far can he travel in 1 hour?
Answer:
116 km/h
Explanation:
We know that km/h means Kilometers an hour. And if this is constant, then he will travel 116 km/h.
Given its reactive nature, oxygen is essential to cellular metabolic reactions. Peroxisomes use oxygen to break down fatty acids. In doing so, they use oxygen to remove hydrogens from fatty acid chains, yielding hydrogen peroxide (H2O2). Cells also routinely release potentially destructive molecules, such as superoxide (O2) in signaling, self-defense, or as a metabolic side product. Superoxide combines with hydrogen peroxide to make an even more destructive molecule called a hydroxyl radical. Therefore, the removal of these two reactants is a routine "housekeeping" chore within the cell. Which enzyme is used to prevent hydrogen peroxide accumulation in the peroxisome?
Answer:
Catalase
Explanation:
These reactive oxygen specie or free radicals that cause damage or injury to cells also lead to oxidative stress if unchecked by antioxidants. As suggested in the question, there are several enzymes that act as antioxidants in mitigating the effects of these reactive oxygen specie or free radicals. These enzymes include catalase, superoxide dismutase and glutathiones (such as glutathione s-transferase).
The enzyme that however prevents the accumulation of hydrogen peroxide (H₂O₂) in the peroxisome is catalase. Catalase is an enzyme that is present in the peroxisome; it (catalase) detoxifies/acts on H₂O₂, converting it (H₂O₂) into water and oxygen.
A change that produces matter with a different composition is a _______ change.
A change that produce matter with a different composition is a chemical change.
The Law of Conservation of Mass says that mass
can neither be
nor
A .Gained, lost
B. Created, destroyed
C. Started, ended
D. Opened, closed
Answer:
B
Explanation:
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
Which is true about the transfer of electrons? Metals tend to gain electrons to form positive ions. Metals tend to lose electrons to form positive ions. Nonmetals tend to gain electrons to form positive ions. Nonmetals tend to lose electrons to form negative ions.
Answer:
Metals tend to lose electrons to form positive ions.
How significant is the use of scientific investigation? Explain
Answer:
Explanation:
Scientific investigations produce evidence that helps answer questions and solve problems. If the evidence cannot provide answers or solutions, it may still be useful. It may lead to new questions or problems for investigation. As more knowledge is discovered, science advances.
C Give two reasons why the formation of aluminium by electrolysis is very
expensive:
Answer:
It is expensive, largely because of the amount of electricity required in the extraction process. Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis.
Is it possible for the sun to burn out tomorrow? Why or why not?
Answer:
It is and isn't possible at the same time.
Explanation:
Stars form when enough hydrogen collects in one place that the sheer gravitational attraction of the mass to itself causes thermonuclear fusion to commence. Unlike a nuclear bomb, the reaction doesn’t last for milliseconds, but for billions of years, as convection currents carry fresh supplies of unfused hydrogen into the reaction zone, and as heavier, already fused material undergoes fusion again, starting a stepladder of elemental construction, building the table of elements from hydrogen up toward iron as far as conditions will allow. So basically, the sun doesn’t burn all at once for the same reason a candle doesn’t: It relies on convective processes to freshen its fuel supply
The first organisms to appear on Earth did not need?
a.
oxygen.
c.
cells.
b.
nitrogen.
d.
chemicals.
PLZ HURRY
I already know that the answer is NOT D.
Answer:
d
Explandation:
Answer:
A.
Explanation:
Because the first organism was bacteria and bacteria does not need oxygen to grow
According to the big bang theory, which describes the universe before the actual big bang occurred? Multiple, cold, dense points, each larger than the sun multiple, hot, dense points, each smaller than an atom single, cold, dense points larger than the sun single, hot, dense points smaller than an atom
Answer:
The correct answer is hot, dense points; each smaller than an atom
Explanation:
The big bang theory was proposed to suggest the expansion of the universe by describing the origin of all components of the universe and it's planetary bodies. It suggested that the whole universe was in a state of high temperature and highly dense points (which were smaller than atoms) but continuously expanded by cooling down which gave rise to the formation of subatomic particles, atoms e.t.c.
Answer:
Its D on edge 2021
Explanation:
just took the test