Chemistry High School

Help pls I don’t know the answer

Answers

Answer 1

Answer:

The first one is correct.

Explanation: Eh Are you cheating on quiz?

Related Questions

2LiBr Pb(NO3)
2 → PbBr2 2LiNO3

Answers

Is this a complete question?

An organism that makes or creates their own food?

A. Consumer
B. Producer
C. Decomposer

Answers

I think producer

option is A

Answer:

B. Producer

Explanation:

A producer is normally a type of plant which is food for the animals. Decomposers are things that decompose dead living things into nutrients and etc. Consumers are the ones who normally feed on producers in the food web and are small animals.

What experimental evidence led Rutherford to conclude the following: (a) The nucleus of the atom contains most of the atomic mass. The nucleus of the atom contains most of the mass since only a collision with a very dense, massive object would cause an alpha particle to be the source. (b) The nucleus of the atom is positively charged. The positive alpha particles their initial flight indicating that the nucleus of the atom is also positively charged. (c) The atom consists of mostly empty space. Most alpha particles pass through the gold foil leading to the conclusion that the atom is mostly empty space.

Answers

Answer:

See Explanation

Explanation:

The experiment of Ernest Rutherford involved the bombardment of a thin gold foil with alpha particles from a radioactive source. A zinc sulphide screen was used to follow the movement of the alpha particles.

It was discovered that most of the alpha particles followed a straight path through the gold foil. Some of them were scattered through large angles and few were even scattered in the backward direction.

Since alpha particles were heavier than electrons, they must have been deflected by very strong forces.

These experimental evidences led to the conclusions stated in the question.

please help me with these questions, im not understanding :(

Answers

Answer:

this is all the answers i hope you have a good day

Explanation:

may i please have a branlliests

What is the herbivore in the following food chain: algae → fish → herons?

Answers

Answer:

algae

Explanation:

fish and herons arent herbivores

Herbivores are typically tagged as animals that feeds directly on the plants in a food chain.

In the given food chain, Fish is the herbivore

As stated, Fish in the food chain is the herbivore as it feeds directly on the plants. The algae in this case is the producer. While the herons are the carnivore that feeds directly on the flesh of the fish but indirectly on the algae.

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What do you predict might happen if groundwater sources around the world continue to be depleted faster than they are restored?
I'll mark brainliest!

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Pumping groundwater faster than it can recharge can lead to dry wells, especially during droughts.
Hope this helps!

while in another country, you should always find out the voltage that is used in that counrrg

Answers

Answer:

Yes I agree

Explanation:

SO2 +
Li2Se →
SSe2 +
Li20
Type of Reaction:

Answers

We want to take inventory of the right and left side

Right: S=1 O = 2 Li = 2 Se= 1

Left: S= 1 Se=2 Li= 2 O=1

Lets balance out each side because we see we are off by 1 oxygen on the left

Add a coefficient of 2 on the Li2O

Add a coefficient of 2 on the right Li2Se

Now we have So2+ 2Li2Se ---> SSe2+ 2Li2O

The equation is already balanced, assuming that there is supposed to be a yields symbol between 2Li2Se and SSe2.

To find out whether or not this equation is balanced, make a little T-chart with the left side of the equation on one side and the left on the other. Next to each element, write down the amount they start off with and make changes as you add coefficients.

Hope this helps!

How is enthalpy related to the spontaneity of a reaction?
A. AH=0 contributes to spontaneity.
B. AH<0 contributes to spontaneity.
C. AH> 0 contributes to spontaneity.
D. AH does not affect spontaneity.

Answers

Answer:

Explanation:

Gibb's free energy change(∆G) and Standard electrode potential of electrochemical (Ecell) determine the spontaneity of a reaction.

when ∆G > 0, the reaction is not spontaneous

∆G < 0, the reaction is spontaneous

∆G = 0, the reaction is in equilibrium

when Ecell > 0, the redox reaction is spontaneous

Ecell < 0, the redox reaction is not spontaneous

Ecell = 0, the redox reaction is in equilibrium.

ΔH < 0 contributes to spontaneity.

What is a spontaneous reaction?A spontaneous reaction is one that takes place naturally under a certain set of circumstances. The general entropy, or chaos, of the system increases in the presence of spontaneous reactions.

How can we determine if a reaction is spontaneous or not?

We can determine it by calculating Gibb's free energy.

How do we calculate Gibb's free energy?

It is calculated by the formula:

ΔG = ΔH - TΔS

ΔG is the change in Gibb's free energy,ΔH is the change in the enthalpyΔS is the change in entropy.

How does ΔG tells if a reaction is spontaneous or not?If ∆G > 0, the reaction is not a spontaneous reaction∆G < 0, the reaction is a spontaneous reaction∆G = 0, the reaction is in equilibrium

How does ΔH contribute to the spontaneity of the reaction?For a reaction to be a spontaneous reaction, ∆G < 0.Consider a reaction, ΔG will be calculated as ΔH - TΔSIf ∆H < 0 then the ΔH - TΔS will be a lesser value ( more negative) than it would have been when ∆H = 0 or ∆H > 0.Therefore ∆H < 0 contributes to spontaneity.

To learn more about ΔH, spontaneous reaction, enthalpy, and entropy here,

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Think about a wooden chair and a balloon. What do these two objects always have in common?

Both are made of atoms.

Both have the same physical properties.

Both are made of the same kind of atom.

Both are made of the same number of atoms.

Answers

Answer:

both are made of atoms. .

Answer:

Both are made of atoms.

Explanation:

What is the gravitational potential energy of a box that is 2.9 m off the ground and a mass of 12.5 kg? * 20 points

Answers

Answer:

362,5J

Explanation:

formula for calculating Gravitational Potential Energy is mass×gravitational field strength ×height

12.5×10×2.9=362,5J

A solution of 12M HCl is diluted so that it goes from 550mL to a total volume of 1000mL. What is the new concentration of the solution?

Answers

Answer:

6.6M

Explanation:

C=concentration

V=Volume

C1V1=C2V2

rearrange formula to find C2

(C1V1)/V2= C2

(12M x 550mL)/1000mL= C2

6600M*mL*/1000*mL* =C2 (cancel units)

6.6M=C2

What do the quantum numbers of electrons represent?
A. The total number of protons and electrons in the atom
B. The number of valence electrons the atom has
O C. The oxidation states most common to the atom
D. The energy levels and orbitals the electrons are in

Answers

Answer:

the energy levels and orbitals the electrons are in

Explanation:

i just took the test :)

The energy levels and orbitals the electrons are in. Hence, option D is correct.

What are atoms?

An atom contains a central nucleus surrounded by one or more electrons.

The quantum numbers of electrons represent the probable distance of the electron from the nucleus. It refers to the size of the orbital and the energy level an electron is placed in.

Hence, option D is correct.

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Which of the following is an indicator that a chemical reaction occurred?
A precipitate is formed
The state of matter changed
It was melted
The identity of the substance did not change

Answers

Answer:

the state of matter changed

Explanation:

Answer:

A) A precipitate is formed

Explanation:

occurs in aqueous solution when two ions bond together to form an insoluble salt, which is known as the precipitate.

How does the way in which the solar system formed explain the orbits, sizes, and compositions of the planets?

Answers

Answer:

DUE TO GRAVITATIONAL COLLAPSE SOLAR SYSTEM IS FORMED , ORBITS ARE CURVED TRAJECTORIES AND SIZE AND COMPOSTION OF PLANET ARE VERY UNIQUE AND COMPOSED OF ROCKS AND METALS and evolution of solar system has began 4.5 billion years ago,due to gravitational collapse of a small particle from a giant cloud.

How are white blood cells linked to the lymphatic system?

Answers

Answer:

The lymphatic system produces white blood cells, known as lymphocytes. There are two types of lymphocyte, T cells and B cells. They both travel through the lymphatic system. As they reach the lymph nodes, they are filtered and become activated by contact with viruses, bacteria, foreign particles, and so on in the lymph fluid.

Explanation:

When a 0.3546 g of vanadium metal is heated in air, it reacts with oxygen to achieve a
final mass of 0.6330 g. Calculate the empirical formula of this vanadium oxide

Answers

Answer:

V2O5 is the empirical formula of vanadium oxide

Explanation:

The molecular mass of Vanadium is 50.949 g/mol

Number of moles of vanadium = 0.3456 g/50.949 g/mol = 0.00696 moles

The molecular mass of Oxygen is 16.0 g/mol

Number of moles of Oxygen = (0.6330 – 0.354) g/16 g/mol = 0.0174 moles

Emperical formula

V (0.00696 moles/0.00696 moles) O (0.0174 moles /0.00696 moles)

V 1 O2.5

Multiply by two get a whole number

V2 O5

F or pass? I’m okay with pass

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Answer:

pass

Explanation:

pass

A mass of 80 grams of Bromine would be

Answers

I’m pretty sure it’s a

Energy pyramid worksheet

Answers

Answer:

From top to bottom coyote, crow, squirrel, then acorn

Explanation:

The coyote has the least amount of energy and its the biggest predator so it belongs at the top. The crows eat squirrels and the squirrels eat acorns.

how many grams is 4.2 moles HCL

Answers

≈153.14 grams. Sine one mole of HCL is ≈36 grams. Just multiple 4.2 by 36.

What is the process of old crust sinking back into a mantle?

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What is subduction? Subduction is the process which the ocean floor sinks beneath a deep-ocean trench and back into the mantle. (A process by which part of Earth's crust sinks downwards).

Which lists the structures, in correct order, through which light passes when it enters the eye?

cones, pupil, lens, sclera

sclera, iris, pupil, lens

vitreous humor, lens, pupil, cornea

cornea, pupil, lens, vitreous humor

hurry plz

Answers

Answer:

cornea, pupil, lens, vitreous humor

Answer:

cornea, pupil, lens, vitreous humor

Explanation:

The kidneys help the body preserve water. When an animal has not had enough to drink, the kidneys signal the body to absorb water. The animal produces little urine, so it loses less water. During this process, the kidneys work in conjunction with which body system?

Answers

Answer:

This regulatory mechanism is in conjunction with the endocrine system, particularly in the posterior pituitary gland. This is related in the secretion of vasopressin or antidiuretic hormone (ADH). In the event of dehydration or extreme thirst, the body will conserve as much fluid as possible and the posterior pituitary will secrete more ADH that will signal the kidney to reabsorb more water in the collecting tubules.

Aluminium is a metal give reason

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Answer:

Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.

Someone plz help me

Answers

Answer:

maybe falling

Explanation:

Air is a force so its probably pushing down the object then making it fall

I think all objects? Not entirely sure.

A new organism is discovered. It is multicellular, heterotrophic, and does move on its own. To which two kingdoms could the organism belong?

Answers

Answer:It is a plant

Explanation:

A new organism is discovered. It is multicellular, heterotrophic, and does move on its own. The organism belong to Kingdom Animalia.

What do you mean by heterotrophs ?

A heterotroph is an organism that obtains energy and nutrients from other plants or animals. The term is derived from the Greek words hetero, which means "other," and trophe, which means "nourishment."

Fungi are multicellular, heterotrophic eukaryotes with chitinous cell walls. Kingdom Plantae contains autotrophic organisms with cellulosic cell walls, whereas Kingdom Animalia contains heterotrophic organisms without cell walls.

Animalia is a kingdom of multicellular, heterotrophic organisms. This kingdom includes humans and other primates, as well as insects, fish, reptiles, and a variety of other animals.

Thus, The organism belongs to Kingdom Animalia.

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A reaction yields 6.26 grams of a CuCl2. What is the percent yield of CuCl2 if the theoretical yield is 18.81g?
% Yield = (Actual Yield/Theoretical Yield) x 100

Answers

Answer:

33% yield

Explanation:

6.26/18.81 =0.33280170122 = 33%

What does dalton mean

Answers

Answer:

Meaning:from the valley town; the settlement in the valley. Sounding like the proper English surname it was derived from, Dalton is all about being smart and trendy with equal parts cool and nerdy. Dalton, which comes from “dael” or “valley,” and “tun,” or “settlement,” may have peaked in the 1990s, but that's okay.

Explanation:

a unit used in expressing the molecular weight of proteins, equivalent to atomic mass unit.

Answer:

A unit used in expressing the molecular weight of proteins, equivalent to atomic mass unit.

Or in simpler terms a unit of measure.

Explanation:

Hope this helps and have a great say!!!!

You push a wagon that has a mass of 24 kg. If the net force on the wagon is 5 N south, what is the wagon's acceleration?

Answers

F=ma, The acceleration is (5/24) meters per second

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