PLEASE I NEED HELP IN CHEMISTRY

Answer:

B. the amount of atoms you contain

Using the concepts of Avogadro Law, we got the given statement is true.

The law of definite proportions defines samples of a compound will always contain the same proportion of the elements by mass. The mass ratio of elements is fixed no matter where the elements comes from, how the compound is prepared. Essentially, the law is based on  fact that an atom of a particular element is the same as any other atom of that element. So, an atom of oxygen is  same, whether it comes from silica or oxygen in the air.

The Law of Constant Composition is  equivalent to definite proportions, which states each sample of a compound has the same composition of elements by mass.

The law of definite proportions actually tells  water will always contain 1/9 hydrogen and 8/9 oxygen by mass.

The sodium and chlorine in table salt combine according to the rule and become NaCl. The atomic weight of sodium is 23grams and that of chlorine is about 35grams, so from the law one may conclude dissociating 58 grams of NaCl will produce about 23 g of sodium and 35 g of chlorine.

Hence, it is true that the substances combine in predictable proportions and that excess reactants remain unchanged.

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Answer:Ocean currents act much like a conveyor belt, transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics.

Explanation:

Answer:

Explanation:

Ocean currents act much like a conveyor belt, transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics. 

hope it helps!

Air filters are devices designed to remove impurities and particles from the air, improving its quality and making it healthier to breathe. While air filters can help remove certain contaminants, such as dust, pollen, and pet dander, they do not specifically filter out carbon dioxide (CO2).

Carbon dioxide is a natural component of the air we exhale, and its concentration in the atmosphere is regulated through natural processes, such as photosynthesis by plants. The removal of carbon dioxide from the air typically occurs through the natural carbon cycle, where plants absorb CO2 during photosynthesis and release oxygen.

If you are looking to reduce the carbon dioxide levels indoors, the most effective method is to ensure proper ventilation in the space. This can be achieved by opening windows or using mechanical ventilation systems to bring in fresh outdoor air and remove stale air. Additionally, increasing the number of plants indoors can help absorb carbon dioxide and release oxygen through photosynthesis.

It's important to note that while air filters can improve indoor air quality by removing various pollutants, they are not designed to specifically target or remove carbon dioxide.

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The mass percent (m/m) of glucose in a solution that contains 30.0 g of water and 5.8 g of glucose is 16.2%.

Thus, the correct option is A.

Mass percent is a term used to describe the concentration of a solution. It is defined as the mass of the solute in grams divided by the total mass of the solution in grams, multiplied by 100 percent.

To find the mass percent of glucose in the given solution, we need to calculate the total mass of the solution. The total mass of the solution is given by the sum of the mass of glucose and water:

30.0 g (water) + 5.8 g (glucose) = 35.8 g (total mass of solution)

The mass percent of glucose in the solution is then calculated as follows:

Mass percent (m/m) = (mass of glucose ÷ total mass of solution) × 100 percent

= (5.8 ÷ 35.8) × 100 percent= 16.2 percent

Therefore, the mass percent (m/m) of glucose in the solution is 16.2%.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{8.11 \times {10}^{20} }{6.02 \times {10}^{23} } \\ = 0.0013471\)

We have the final answer as

Hope this helps you

The rate at which the volume is changing when the temperature is 290 K and increasing at a rate of 0.15 K/s and the pressure is 14 kPa and increasing at a rate of 0.05 kPa/s is approximately -0.9474 L/s.

The rate at which the volume is changing when the temperature is 290 K and increasing at a rate of 0.15 K/s, and the pressure is 14 kPa and increasing at a rate of 0.05 kPa/s can be found using implicit differentiation.

Given: PV = 8.31T

To find dV/dt, we need to differentiate both sides of the equation with respect to time (t) while considering the chain rule:

P(dV/dt) + V(dP/dt) = 8.31(dT/dt)

Substituting the given values:

14(dV/dt) + 290(0.05) = 8.31(0.15)

Rearranging the equation to solve for dV/dt:

14(dV/dt) = 1.2465 - 14.5

14(dV/dt) = -13.2535

(dV/dt) = -13.2535/14

(dV/dt) ≈ -0.9474

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Answer:

Method: Measure out 25 cm3 of 0.5 mol dm3 lead(II)nitrate solution and add it to a small beaker. Measure out 25 cm3 of 0.5 mol dm3 of potassium sulfate add it to the beaker and mix together using a stirring rod.

Answer:

Bile

Explanation:

Bile is secreted by the liver to help in the breaking down of food particles.​

Answer:

It was part of a slow underwater eruption.

Explanation:  Or just A (:

Answer:

i agree with the human above me

Explanation:

love ye have a great day but i didnt have a good day bc my uncle ate my cheese puffs :'( anyways i got a 100 on the assaignment and this was the only answer i had to look up im proud of me

Answer:awrf

Explanation:

Both cellular respiration and burning (combustion) include the dissolution of chemical bonds, the use of oxygen, the generation of carbon dioxide, and the release of energy. However, there are some key differences between the two processes.

The fundamental chemical process of releasing energy from a fuel and air mixture is combustion, sometimes referred to as burning. In an internal combustion engine (ICE), the gasoline is ignited and burned inside the engine itself. The energy from the combustion is then partially converted into work by the engine.

Cellular respiration is a series of chemical reactions that break down glucose to produce ATP, which may be used as energy to power many reactions throughout the body. There are three main steps of cellular respiration: glycolysis, the citric acid cycle, and oxidative phosphorylation.

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The phenomenon known as "positive selection" occurs under conditions where a strong selection pressure acts on a particular change in an amino acid.

Positive selection is a process that leads to the fixation of a beneficial mutation in a population, and it is often associated with adaptations to new environmental conditions or host-pathogen interactions.

Positive selection can be detected by comparing the rates of non-synonymous (amino acid-changing) and synonymous (silent) substitutions in protein-coding genes, and it has important implications for understanding the evolution of molecular pathways and the emergence of novel functions.

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Answer: Organic acids form when a carboxyl group (−COOH) is substituted for one of the hydrogen atoms in a hydrocarbon.

Answer:

I think its "sunspots"

Explanation:

RNA polymerase III (pol III) is a critical enzyme that transcribes small non-coding RNAs, such as tRNAs, 5S rRNA, and other small regulatory RNAs.

For transcription to occur, pol III needs to recognize and bind to the promoter sequence upstream of the coding region.

Several proteins and complexes are involved in this process, including TBP, UBF1, TFIIIC, Brf, and B". Among these, TFIIIC and B" are responsible for unwinding the DNA double helix, which is necessary for transcription initiation.

Specifically, TFIIIC recruits B", which then binds to the promoter and initiates the melting of the DNA. Once the DNA is melted, TBP and Brf can bind to the promoter, allowing pol III to initiate transcription.

Overall, the interplay between these proteins and complexes is essential for efficient and accurate transcription by RNA pol III.

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Answer:

\(\Delta H=-92.7kJ\)

Explanation:

Hello there!

In this case, according to the given information, we can infer that 890 kJ of energy are released when 1 mole of methane is burned; however, to find the total heat when 1.67 grams are burned, we first need to calculate the moles in this mass of methane:

\(1.67gCH_4*\frac{1molCH_4}{16.04gCH_4}=0.104molCH_4\)

And thus, for calculating the resulting ∆H, we proceed as follows:

\(\Delta H=-890kJ/mol*0.104mol\\\\\Delta H=-92.7kJ\)

Regards!

The Arrhenius bases among the given options are Ba(OH)2 and KOH. Arrhenius bases are substances that, when dissolved in water, release hydroxide ions (OH-) as the predominant species. Among the given options:

a. H3AsO4: This is not an Arrhenius base. It is a polyprotic acid, known as arsenic acid, and releases protons (H+) when dissolved in water, making it an acid.

b. Ba(OH)2: This is an Arrhenius base. When Ba(OH)2 is dissolved in water, it dissociates into Ba2+ ions and hydroxide ions (OH-). The hydroxide ions make it a base.

c. HClO: This is not an Arrhenius base. It is a weak acid, known as hypochlorous acid, and releases protons (H+) when dissolved in water.

d. KOH: This is an Arrhenius base. When KOH is dissolved in water, it dissociates into K+ ions and hydroxide ions (OH-). The presence of hydroxide ions makes it a base.

Therefore, the Arrhenius bases among the given options are Ba(OH)2 and KOH.

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Answer:

About 0.08486 moles

Explanation:

PV=nRT, when P is the pressure in atmospheres, V is the volume in liters, n is the number of moles, R is the universal gas constant, and T is the temperature in Kelvin.

\(0.432 \cdot 5= n \cdot 0.0821 \cdot 310\)

\(n\approx 0.08486\) moles

Hope this helps!

Answer:

46860.8 joules of heat

Explanation:

Use the formula ΔQ = mcΔT

ΔQ = gain or loss of heat (in joules)

M = mass (in grams),

C = specific heat (in J/g°C)

ΔT = change in temperature (in °C)

Substitute the known values into the formula:

ΔQ = (320.0 g)(4.184 J/g°C)(35.0˚C)

ΔQ = 46860.8 J

The air is cooled by the currents, which causes it to rise and warm when it crosses land. This warming causes the air to hydrate, then afterward precipitates as the air passes deeper inland.

The impacts of grasslands hitting the sea are typically astounding. Namibia and or the Western Sahara constitute the place where the African desert meets north Mediterranean Sea. Moreover, the Sahara extends eastward to the Red Sea. The Atacama Desert and the Pacific Ocean meet strikingly in northern Chile.

Cold ocean currents that move near the shore drive coastal deserts to emerge. The air is stabilised by the chilly winds, which also prevent cloud development. It produces a significant amount of fog. A dense blanket of minute water droplets which are too light to disperse as rain makes up a fog.

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Answer:

43.4

Explanation:

I think

The liquid with a mass of 31.1415 g and a volume of 30.13 ml has a density of: 1.033 g/ml

The density formula and the procedure we will use is:

d = m/v

Where:

Information about the problem:

Applying the density formula we get:

d = m/v

d = 31.1415 g/30.13 ml

d = 1.033 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:

C) P2 = (300/330) P

Gay-Lussac's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is kept constant.

Mathematically, it can be written as:

P/T = k

A gas has a pressure P at 27 °C and we want to find the expression to calculate its pressure at 57°C.

We do so by summing 273.15.

K = 27 + 273.15 = 300 K

K = 57 + 273.15 = 330 K

P2/330 = P/300

P2 = (300/330) P

A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:

C) P2 = (300/330) P

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Answer:

neon

Explanation:

it comes in different colours

The K s p of Cu(OH)2 = 3.11 * 10^-5

What is K s p value ?

The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant, K s p. It stands for the degree of solute dissolution in solution. A substance's K s p value increases with how soluble it is.

Solubility of A x B y salt

K s p = \(X^x Y^y S^(x+y)\)

Solubility of Ca(OH)2 = 0.0198M

K s p = 1 * 2^2 * ( 0.0198) ^ 1+2 = 3.11 * 10^-5

K s p = 3.11 * 10^-5

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Significant figures are the number of digits in a number. To count the significant figures we must take into account that the zeros before the digit should not be counted, but the intermediate zeros or after the digit should be counted.

Now, when we do the two-digit division, the significant figures of the quotient will be equal to those of the digit with the fewest number of significant figures. Let's see what are the figures of the terms of the division and the final result:

We see that the quotient of the division is 0.746899..., but we have to write the answer only with 3 significant figures. If the number after the last figure to which we want to approximate is greater than 5, we must add 1 to the last figure, so the result will be: 0.747.

Answer: 0.747