please help , i’m doing a test and i’m really bad at science , lol , thank you !

Answer:

56.1 ppm

Explanation:

Molar mass of KOH is 56.1g

Mass of 0.01 mole of KOH = 0.561g

Mass of water = 10kg = 10000g

Concentration of KOH in ppm = 0.561 / 10000 * 1000000

= 56.1 ppm

Moles of KOH=0.01mol

Concentration of KOH:-

[tex]\\ \rm\Rrightarrow 0.561/10=0.561nm[/tex]

[tex]\\ \rm\Rrightarrow 56.1ppm[/tex]

Answer: it is group1 or group 3 on god

Explanation:

Answer: It’s D. Barium (Ba)

Explanation:

Answer:

B. Spontaneous combustion

Explanation:

If the reaction is happening completely on its own, it is spontaneous!

Hopefully this helps- let me know if you have any questions!

Answer:

D) part is the correct answer

Answer:The answer is D

Explanation:The moon is a bit more than one-fourth (27 percent) the size of Earth, a much larger ratio (1:4) than any other planets and their moons. Earth's moon is the fifth largest moon in the solar system. The moon's mean radius is 1,079.6 miles (1,737.5 kilometers).

Two p orbitals of atoms can overlap to form a pi bond in any molecule.

Pi bonds are come under the categories of multiple bond as in any molecule first molecule is the sigma bond, and the second bond is the pi bond.

Pi bonds are the result of the side or lateral overlapping of the un-hybrid orbitals. Orbitals which takes part in the formation of pi bonds are p-orbitals and in the pi bonds, electron density is present above or below the pi bond.

Hence, option (a) is correct, i.e. two p-orbitals overlap to form a pi bond.

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The new volume of a gas at STP that occupies 16L of space is 27.43L.

The volume of a given gas can be calculated using the following expression:

P1V1/T1 = P2V2/T2

Where;

1 × 16/273 = 2.6 × V2/468

16/273 = 2.6V2/468

0.0586 × 468 = 2.6V2

V2 = 27.43

Therefore, the new volume of a gas at STP that occupies 16L of space is 27.43L.

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A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.

A lunar eclipse occurs when the Sun, Earth, and Moon align in the same line in which the Moon passes into Earth's shadow. In a total lunar eclipse, the entire Moon falls within the darkest part of Earth's shadow, called the umbra so we can conclude that claim 2  is the right answer about lunar eclipse.

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Answer:

In the followings below, the one that doesn't attract to magnets is:

Option 4, Aluminum.

Explanation:

Mainly because of the aluminum's crystal structure.

Hope this helped you out! ^^

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Answer:

Aluminum

Explanation:

Ferromagnetic Metals

Ferromagnetic metals and alloys are the only magnetic metals. Out of all of the elements on the periodic table, there are only 3 metals that are attracted to magnets: iron, nickel, cobalt.

Aluminum

Aluminum is a nonferrous metal (meaning not including iron or steel) that does not include any ferromagnetic metals. Additionally, aluminum itself is not magnetic, so there is no attraction between aluminum and a magnet.

Answer:

409.0 grams

Explanation:

total mass-(mass of salt+mass og empty beaker)

Answer:

442

Explanation:

og empty beaker + salt

Answer:

Soluble salts can be made by reacting acids with soluble or insoluble reactants. Titration must be used if the reactants are soluble. Insoluble salts are made by precipitation reactions.

Making insoluble salts

An insoluble salt can be prepared by reacting two suitable solutions together to form a precipitate.

Determining suitable solutions

All nitrates and all sodium salts are soluble. This means a given precipitate XY can be produced by mixing together solutions of:

X nitrate

sodium Y

For example, to prepare a precipitate of calcium carbonate:

X = calcium and Y = carbonate

mix calcium nitrate solution and sodium carbonate solution together

calcium nitrate + sodium carbonate → sodium nitrate + calcium carbonate

Ca(NO3)2(aq) + Na2CO3(aq) → 2NaNO3(aq) + CaCO3(s)

It also works if potassium carbonate solution or ammonium carbonate solution is used instead of sodium carbonate solution. Remember that all common potassium and ammonium salts are soluble.

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Explanation:

Mix lead nitrate and sodium carbonate solutions, forming lead carbonate precipitate, filter, wash, and dry.

To obtain a pure dry sample of solid lead carbonate (PbCO₃), follow these steps:

Prepare Solutions: Dissolve lead nitrate (Pb(NO₃)₂) in water to make a lead nitrate solution, and dissolve sodium carbonate (Na₂CO₃) in a separate container to make a sodium carbonate solution.

Mixing Solutions: Slowly add the sodium carbonate solution to the lead nitrate solution, drop by drop, while stirring. A white precipitate of lead carbonate will form.

Precipitate Formation: Pb(NO₃)₂(aq) + Na₂CO₃(aq) → PbCO₃(s) + 2NaNO₃(aq)

Filtration: Carefully filter the mixture to separate the solid lead carbonate precipitate from the remaining solution (filtrate).

Washing: Wash the precipitate with distilled water to remove any remaining soluble impurities.

Drying: Place the wet lead carbonate precipitate on a filter paper and let it air dry or use an oven at a low temperature. Once completely dry, a pure sample of solid lead carbonate is obtained.

This process ensures the separation of lead carbonate from the solutions and other compounds, yielding a dry and pure sample of the desired compound.

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The molecules at point A are farther apart than the molecules at point B due to increase in temperature.

.

Temperature is a measure of the average kinetic energy of the particles of a substance.

The higher the temperature, the greater the kinetic energy of the molecules.

When water molecules are heated, the molecules acquire greater kinetic energy and move further apart.

Therefore, the molecules at A are farther apart than those at B.

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The correct equation for equilibrium constant is K = [CO][Cl₂] / [COCl₂].

Here K is the equilibrium constant and value of K is define as the ratio of the product of the concentration of the formed products to the product of the concentration of the reactants.

Given chemical reaction is:

COCl₂(g) ⇄ CO(g) + Cl₂(g)

In the equilibrium state, equilibrium constant will be written as:

K = [CO][Cl₂] / [COCl₂]

Hence, the correct equation for the value of the equilibrium constant is K = [CO][Cl₂] / [COCl₂].

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Answer:

Explanation:

b

Answer: the answer is a

Explanation:

you should always keep lab coat on when in lab

Answer:

its  A. chemistry labs have a lot of things that can hurt you, even with just a few drops . its one of the most dangerous experiment types you do in science. even if your not doing an experiment  but your in the room you should have on protection in case of a spill or something.  it is always impotent  to have safety  gear on. even more so in chemistry

Answer:

NO. The density of a person remains the same wherever they are in the universe.

Explanation:

hopes this helps have a wonderful day

Density of a person does not change with the change in planet. Because, the density depends on the mass of the object.  Therefore, the density of a person in moon and earth is same.

Density of a substance is the measure of its mass per unit volume. Density of a substance depends on the temperature and  pressure. The density is thus, the ratio of mass to the volume.

Density describes how closely the particles are packed in an object. The weight of an object on other side is the mass multiplied by the gravity. Weight is a downward force acting on the object.

The weight of a person differ in earth and moon. However, density does not depends on the weight of the person but on mass only so  does remains constant.

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Answer:

Element

Explanation:

All matter is made up of very small particles called atoms. Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element.

By the process of natural selection, individuals in Finch 1 will evolve over time to resemble individuals in Finch 2.

Natural selection is the process by which individuals who possess certain features or structures that make them better suited to their environment are able to survive and reproduce in their environment while those who do not have such features die off.

Since the preferred food for Finch 1 has become scarce due to drought, individuals in Finch 1 who have features that enable them eat larger seed will be naturally selected for survival , most population in Finch will be composed of such individuals.

Therefore, natural selection will cause individuals in Finch 1 to evolve over time to resemble individuals in Finch 2.

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Answer: 434 Kelvin

Explanation:

Assuming pressure is constant, the formula: V / T = V / T can be used.

However, all temperatures must first be converted to Kelvin by adding 273 to them:

(35 + 273) = 308K

Now, plug in: 606 / 308 = 854 / T → 1.98753T = 854 → 434 K :)

Answer: A/B

Explanation:

It is most likely formed from igneous rock that was once buried

Answer: a

Explanation:

Answer:

Fusion

Explanation:

Fission definition:

   In nuclear physics and nuclear chemistry, nuclear fission is a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into two or more smaller, lighter nuclei.

Fusion definition:

   Nuclear fusion is the process by which two or more atomic nuclei join together, or “fuse,” to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy, which is released.

Both together: (vs.)

Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same. Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.

Answer:

protons and neutrons

Explanation:

Answer:

false \

explaintion

then wound pond and lakes be salt water

The salt in the ocean mainly comes from runoff from the land and openings in the seafloor. So, I would say false.

Answer:

Explanation:

[tex]density \: = \frac{mass}{volm} [/tex]

why helium is inactive

Answer:

1) There are people who want a child

2) There are people who are idiots and do it for fun.

Explanation:

It's simple I guess. lol

Answer:

All animals and living things need to reproduce to keep their species alive

Explanation:

Like the other person commented, some people want to have kids, and others do it for fun LOL.

Btw,

With other species, the animals that DO reproduce are the ones that are most likely to survive, like a green bird in a heavily forested environment would survive, while a pink bird wont. This helps protect their species and ensure that the "most likely to survive", reproduces, so their offspring also are most likely to survive!

:)

Answer:

5.5kg de CO₂ son producidos

Explanation:

La reacción de combustion del octano (C₈H₁₈) es:

2 C₈H₁₈ + 25 O₂ → 16CO₂ + 18H₂O

Donde 2 moles de octano producen 16 moles de CO₂

2kg de octano = 2000g son, en moles (Masa molar octano: 114.23g/mol; Pureza del 90%):

2000g * (1mol / 114.23g) * 0.90 = 15.76 moles de octano

Asumiendo una conversión total, las moles de CO₂ producidas serán:

15.76 moles de octano * (16 moles CO₂ / 2 moles C₈H₁₈) = 126 moles de CO₂

La masa de 126 moles es (44.01g/mol):

126 moles de CO₂ * (44.01g / mol) = 5548g =

Answer:

Solid---> Liquid