What is conserved in physical changes?

shape
energy
mass
density

Answer:

The law of multiple proportions states that when two elements combine to form more than one compound, the mass ratios of the elements in the compounds can be expressed as small whole numbers.

Let's assume that the metal M combines with oxygen to form two different oxides, which are represented by the formulas MOx and MOy, where x and y are the number of oxygen atoms in each oxide.

According to the problem, the two oxides contain 11.1% and 20.0% of oxygen, respectively. We can convert these percentages to mass ratios as follows:

Mass ratio of oxygen in MOx = 11.1 g / 100 g of oxide

Mass ratio of oxygen in MOy = 20.0 g / 100 g of oxide

We can simplify these ratios by dividing each by their lowest common factor, which is 1.1:

Mass ratio of oxygen in MOx = 10 g / 91 g of oxide

Mass ratio of oxygen in MOy = 20 g / 100 g of oxide = 20 g / 91 g of oxide

These ratios can be expressed as small whole numbers by multiplying them by a factor that makes the denominator equal to a whole number. We can multiply the ratio for MOx by 10 to get:

Mass ratio of oxygen in MOx = 100 g / 910 g of oxide

We can multiply the ratio for MOy by 5 to get:

Mass ratio of oxygen in MOy = 100 g / 910 g of oxide

Now we can see that the mass ratios of oxygen in the two oxides are in a small whole number ratio of 1:1, which is consistent with the law of multiple proportions. This means that the metal M forms two different oxides in a ratio of small whole numbers, and that the composition of the oxides is determined by the ratio of the masses of the elements involved.

Explanation:

Answer:

It may leave some chemicals such as herbicides and pesticides in the water

Explanation:

i just took the test

Distillation may leave some chemicals such as herbicides and pesticides in the water. Therefore, option D is correct.

By using selective boiling and condensation, distillation, also known as traditional distillation, is the process of removing the constituents or compounds from a liquid mixture. The process of heating solid materials to create gaseous products is known as dry distillation.

A chemical is purified through distillation by being separated from a non-volatile or less-volatile substance. Because various compounds frequently have different boiling points, when a mixture is distilled, the components frequently separate from the mixture.

Among the many industrial uses of distillation are the production of alcoholic drinks, water purification, and oil refining. Distillation is a physical procedure that removes desired pure compounds from an initial source using heat and other techniques.

Thus, option D is correct.

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All matter has bodily and chemical homes. Physical homes are traits that scientists can degree with out converting the composition of the pattern below study, including mass, color, and volume.

Chemical homes describe the function  potential of a substance to react to shape new substances; they encompass its flammability and susceptibility to corrosion.

All samples of a natural substance have the identical chemical and bodily homes. For example, natural copper is constantly a reddish-brown stable (a bodily property) and constantly dissolves in dilute nitric acid to supply a blue answer and a brown gas (a chemical property).

Physical homes may be widespread or in depth. Extensive homes range with the quantity of the substance and encompass mass, weight, and volume. Intensive homes, in contrast, do now no longer rely on the quantity of the substance.

they encompass color, melting point, boiling point, electric conductivity, and bodily nation at a given temperature. No matter what quantity is examined Scientists typically degree in depth homes to decide a substance’s identity, while widespread homes deliver records approximately the quantity of the substance in a pattern.

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Answer:

12.56 moles

Explanation:

Answer: 1250 miles

Explanation:

D=vt

1250 miles= 250mph(5hr)

Approximately 27.44 grams of nitrogen (N₂) would be required to fill the balloon to the same pressure, volume, and temperature as the given 0.14 g of helium (He).

To determine the mass of nitrogen (N₂) required to fill the balloon to the same pressure, volume, and temperature as the given 0.14 g of helium (He), we need to use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

Since the pressure, volume, and temperature are the same for both gases, we can compare the number of moles of helium (He) and nitrogen (N₂) using their molar masses.

The molar mass of helium (He) is approximately 4 g/mol, and the molar mass of nitrogen (N₂) is approximately 28 g/mol.

Using the equation: n = mass / molar mass

For helium (He): n(He) = 0.14 g / 4 g/mol
For nitrogen (N₂): n(N₂) = (0.14 g / 4 g/mol) * (28 g/mol / 1)

Simplifying: n(N₂) = 0.14 g * (28 g/mol) / (4 g/mol)

Calculating: n(N₂) = 0.14 g * 7

The number of moles of nitrogen (N₂) required to fill the balloon to the same pressure, volume, and temperature is 0.98 moles.

To find the mass of nitrogen (N₂) required, we can use the equation: mass = n * molar mass

mass(N₂) = 0.98 moles * 28 g/mol

Calculating: mass(N₂) = 27.44 g

Therefore, approximately 27.44 grams of nitrogen (N₂) would be required to fill the balloon to the same pressure, volume, and temperature as the given 0.14 g of helium (He).

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Answer:

AQUACULTURE

*Explanation*

Aquaculture is the controlled process of cultivating aquatic organisms, especially for human consumption. It's a similar concept to agriculture, but with fish instead of plants or livestock. Aquaculture is also referred to as fish farming.

The Sodium bicarbonate, also known as nahco3, functions as an antacid by neutralizing excess stomach acid. When there is too much acid in the stomach, it can cause discomfort and heartburn. Sodium bicarbonate reacts with the acid to form carbon dioxide, water, and a salt. The chemical reaction can be represented by the equation. NaHCO3 + HCl → NaCl + CO2 + H2O.

The equation, NaHCO3 sodium bicarbonate reacts with HCl hydrochloric acid to form NaCl sodium chloride, also known as table salt, CO2 carbon dioxide, and H2O water. The carbon dioxide produced helps to relieve the discomfort caused by excess stomach acid. Overall, the reaction helps to balance the pH level in the stomach and reduce acidity.  Sodium bicarbonate, NaHCO3, functions as an antacid by neutralizing excess stomach acid. The primary acid in your stomach is hydrochloric acid HCl, which helps to break down food. When there's too much acid, it can cause discomfort and heartburn. Here's the step-by-step explanation of how sodium bicarbonate acts as an antacid, including the chemical reaction Sodium bicarbonate NaHCO3 dissolves in water and dissociates into Na+ and HCO3-. The bicarbonate ion HCO3- reacts with the hydrochloric acid HCl in your stomach. This reaction produces water H2O, carbon dioxide CO2, and sodium chloride NaCl.The chemical reaction can be represented asHCO3- aq + HCl aq → H2O I + CO2 g + NaCl aq This neutralization reaction reduces the acidity in your stomach, providing relief from the symptoms associated with excess stomach acid.

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Answer:

Explanation:

A solid, at a given temperature, has a definite volume  

and shape which may be affected by changes in  

temperature. Solids usually increase slightly in size  

when heated (expansion)  and usually  

decrease in size if cooled (contraction).A liquid, at a given temperature, has a  

fixed volume and will take up the shape of any  

container into which it is poured. Like a solid, a  

liquid’s volume is slightly affected by changes in  

temperature.

A gas, at a given temperature, has neither a definite  

shape nor a definite volume. It will take up the shape  

of any container into which it is placed and will  

spread out evenly within it. Unlike those of solids  

and liquids, the volumes of gases are affected quite  

markedly by changes in temperature.

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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Answer: Oxygen is formed as the waste product. Some is used for respiration by the plant. The excess is released from the leaves, making it available for respiration to animals and many microorganisms. During the light, provided the rate of photosynthesis is sufficiently high, plants, give out oxygen.

Explanation:

Answer:

Graham's law states that the rate of effusion or of diffusion of a gas is inversely proportional to the square root of its molecular weight. So, rate of diffusion of hydrogen gas is four times faster than oxygen gas.

Explanation:

Answer:

Rate of diffusion of hydrogen is higher than other gases because mass of hydrogen is very small and it diffuses easily.

Explanation:

Explanation:

Calamine solution contains zinc carbonate and is basic in nature. When applied in the skin, it reacts with the acid, and neutralizes its effect, thus giving relief.

The process in the petroleum industry involves bringing oil and gas to the surface, converting crude oil into other products, and selling those products to customers. The correct choice is B. upstream; downstream.

In the petroleum industry, the process can be divided into three main sectors: upstream, midstream, and downstream. Upstream activities involve the exploration and extraction of crude oil and natural gas from underground reserves. This includes locating oil and gas deposits, drilling wells, and bringing the oil and gas to the surface.

Once the oil and gas are extracted, the midstream sector comes into play. Midstream activities involve the transportation, storage, and processing of the crude oil and natural gas. This includes pipelines, storage tanks, and facilities that separate the oil and gas into different components.

Finally, the downstream sector involves refining the crude oil into various products and selling those products to end consumers. Downstream activities include refining, petrochemical production, distribution, and marketing of the final petroleum products, such as gasoline, diesel, jet fuel, lubricants, and various other chemicals.

Therefore, in the given scenario, the correct choice is B. upstream; downstream, as it represents the process of bringing oil and gas to the surface (upstream) and then converting crude oil into other products and selling them to customers (downstream).

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Answer:

Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

The mass of the object obtained is 1.32 g and the percent yield is  34.3%.

We know that the reaction equation shows the way the reactants are able to interact so as to obtain the products. We have that;

Number of moles of sodium sulfate = 0.196 M  * 57.9/1000 L

= 0.011 moles

Number of moles of magnesium chloride = 0.398 M * 167/1000 L

= 0.066 moles

Given that the reaction is 1:1, the limiting reactant is sodium sulfate

Then;

Mass of the magnesium sulfate produced = 0.011 moles * 120 g/mol

= 1.32 g

The percent yield of the magnesium sulfate = 0.453 g/ 1.32 g * 100/1

= 34.3%

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Answer:

The heliocentric theory was better supported by data explaining the rotation of the planets and other bodies in the solar system.

Explanation:

The basis for the ability of the potassium channel to discriminate between these two ions is the restriction of the channel desolvates sodium ions but not potassium ions. The correct answer is D.

The selectivity filter of the potassium channel is a narrow pore that is lined with protein carbonyl groups. These carbonyl groups are able to interact with the hydrated potassium ion and coordinate it, while excluding the larger hydrated sodium ion.

In addition, the size of the selectivity filter is such that it allows the passage of the smaller, dehydrated potassium ion but not the larger, dehydrated sodium ion. The channel also includes a structure called the "ion cage," which desolvates the ion by stripping off its water molecules.

This process is more effective for sodium ions than for potassium ions because the sodium ion is smaller and has a higher charge density, making it more strongly solvated by water molecules.

As a result, the potassium channel is able to discriminate between potassium and sodium ions based on their size and solvation properties.

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Answer:

See explanation

Explanation:

Oxide has a 2- charge.

Copper (I) Oxide = Cu2O

Copper (II) Oxide = CuO

The formula CuO can not be used to represent both copper I oxide and copper II oxide.

The formula of an ionic compound takes into account the oxidation state and valency of the the metal cation which is usually shown as a Roman numeral in the name of the compound.

For the compound copper I oxide, the correct representation of the compound is Cu2O. This shows that oxygen has a valency of 2 while copper has a valency of 1 in the compound.

The correct representation of copper II oxide is CuO. In the compound, both copper and oxygen have valency of 2.

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The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.

What is a micropipette?

A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.

Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.

Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.

It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.

Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.

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When we convert the atmospheric pressure of 560 mmHg to atm, the result obtained is 0.737 atm

We can convert atmospheric pressure in mmHg to atm, by using the following conversion scale:

760 mmHg = 1 atm

Now, we shall convert the atmospheric pressure of 560 mmHg to atm as follow:

760 mmHg = 1 atm

Therefore,

560 mmHg = (560 mmHg × 1 atm) / 760 mmHg

560 torr = 0.737 atm

Thus, we can conclude from the above calculation, that the atmospheric pressure (in atm) is 0.737 atm

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Answer:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Explanation:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Answer:

The shorter a wave length, the high its energy.       C

Explanation:

They are all related by one important equation: Any electromagnetic wave's frequency multiplied by its wavelength equals the speed of light. FREQUENCY OF OSCILLATION x WAVELENGTH = SPEED OF LIGHT We can use this relationship to figure out the wavelength or frequency of any electromagnetic wave if we have the other measurement.

Hope it helps!

The reaction's net ionic equation  when sodium phosphate is added to hard water to soften it.

3Ca2++2PO3−4→Ca3(PO4)2(s)

The chemical conversion of one group of chemical constituents into another is known as a chemical reaction.

Chemical reactions take place when atoms' chemical bonds are made or broken.

Reactants are the substances that start a chemical reaction, while products are the substances that come out of the process.

Through chemical processes, plants develop, begin to produce fruit, and then disintegrate to become compost for new plants.

High mineral content water is referred to as hard water. When water percolates through limestone, chalk, or gypsum deposits, which are mostly composed of calcium and magnesium carbonates, bicarbonates, and sulfates, hard water is created. Drinking hard water may offer some health advantages.

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Twice as much more will the freezing point of water be lowered in beaker a than in beaker b.

A liquid's freezing point rises if the intermolecular interactions between its molecules are strong. The freezing point, however, drops if the molecules of inter - molecular are minimal. The process through which a substance transforms from a liquid into a solid is known as freezing.

Freezing points play a big role in occupational safety. A chemical may perhaps turn harmful if held below its freezing point. A critical safety benchmark for assessing the effects of worker exposure to cold environments is the freezing point.

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Answer:

Spring tides have higher high tides and lower low tides whereas neap tides have lower high tides and higher low tides.

Explanation:

Answer:

Spring tides have higher high tides and lower low tides whereas neap tides have lower high tides and higher low tides. Hence, the range (difference in water level between high and low tide) is much larger in a spring tide than in a low tide.

A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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It is not possible to conclude that light carries energy by comparing the temperature of the two thermometers.

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