For a specific unknown sample of matter, the molecules are; moving fast, compressible, and can change their shape. Which of the following examples of matter is the identity of the unknown sample of matter?gaseous air

Answer:

Fundamentally, chemistry is the study of matter and change. The way that chemists study matter and change and the types of systems that are studied varies dramatically. Traditionally, chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry.

Explanation:

hope this helps

Answer:

The correct option is;

decreasing entropy is a nonspontaneous

Explanation:

Recycling of aluminium beverage cans involves the process of remelting scrapped beverage after the cans were first produced and used initially

1) The cans are cut into pieces so as to make them more compact and accessible for cleaning

2) The cans are then blocked and melted by heating and the impurities and hydrogen gas are removed

3) The composition of the molten aluminium alloy is altered by the addition of the alloy composition to get the right specification of the alloy

4) The molten alloy can then be sent for usage where it will be processed into solid aluminium objects without the requirement for much energy addition

By the second law of thermodynamics, processes 1, and 2 which involve the addition of energy from the surrounding to decrease the randomness of the scrapped beer cans such that the entropy of the surrounding decreases are not spontaneous processes, while process 4 where the molten aluminium will be cooled down to form solid aluminium does not require energy input but adds energy to the surrounding in the surrounding's entropy, is therefore a spontaneous process.

Therefore, decreasing the entropy of the universe by heating aluminium to melt it is a non spontaneous process

When current is allowed to flow, the species that gets oxidized depends on the specific conditions of the system. However, based on the given options, the likely species to be oxidized would be A) Cr₂O₇²⁻.

When current flows in a system, oxidation and reduction reactions occur simultaneously at different electrode surfaces. The species that gets oxidized is the one that loses electrons. In the given options, Cr₂O₇²⁻ and MnO⁴ are both polyatomic ions with high positive oxidation states, while Cr³⁺ and Mn²⁺ have lower positive oxidation states. H³⁺ refers to a hydrogen ion, which is not a likely candidate for oxidation in this context.

In the case of Cr₂O₇²⁻, it has a higher positive oxidation state compared to Cr³⁺. Therefore, it is more likely to undergo oxidation and lose electrons when current is allowed to flow. The half-reaction for the oxidation of Cr₂O₇²⁻ to Cr³⁺ can be represented as follows:

Cr₂O₇²⁻ (aq) → 2Cr³⁺ (aq) + 3e⁻

This reaction involves the reduction of another species, which gains the electrons released during the oxidation of Cr₂O₇²⁻. It's important to note that the actual species being oxidized or reduced can vary depending on the specific conditions of the system, such as pH and the presence of other reactants.

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The temperature along the H-R-x-axis. A's Growing from left to right.

Moreover, the temperature can be seen to drop as one moves further to the right along the x-axis. Moreover, the H-R diagram can be broadly divided into four quadrants. The stars in the top-left quadrant are warm and brilliant, while those in the top-right quadrant are cool and bright.

If you can interpret what each axis in the HR diagram implies, it's really simple to understand. The star's surface temperature is measured along the horizontal axis in Kelvin. The stars on the right are significantly cooler and redder in hue than the stars on the left, and they are 3000 Kelvin in temperature.

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The first one appear to be a pan with some liquid heating up.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The second one seems to be a ice cube melting.

Its beginning phase is solid, the phase change type is fusion, and its ending state is liquid.

The third one is water, or other liquid, making clouds.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The fourth illustration seems to be an aluminium can. There aren't really a phase change happening, but when we open the aluminium can containing gaseous drink, there are molecules of gas diluted into the liquid and some of it encouter each other to make a bubble of the gas and is released. It is not an actually phase change, it is the reverse process of diluting gas into liquid. Initially it is diluted gas, it gets released and in the end it is in gas phase.

Answer:

Four seasons occur on Earth

Explanation:

When the Earth has completely one revolution around the Sun, then it has completed 1 year, and four seasons have occurred in the meantime.

Four seasons occur on Earth when the Earth completes a revolution around the Sun.

The following points can be considered:

Therefore the correct answer is Four seasons occur on Earth.

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Answer:

Deserts and oceans appear to be far from one another will little in common, but in fact, they're connected in an intresting way.Water from the open evaporates into clouds that travel and eventually empty the water onto the land,creating much-needed sources of water in dessert areas.Meanwhile,winds from the dessert sweep up billions of tons of dust intosky,at least a quarter of which falls into the ocean and provides nutrients for marine life.

Explanation:

The experimental percentage yield is the ratio of the actual yield of the product of a reaction to its theoretical yield multiplied by 100.

Percentage yield of a reaction is used to study the efficiency of a chemical reaction. It is the ratio of the actual yield to the theoretical yield multiplied by 100.

The actual yield of a reaction is the experimentally obtained value and it will be less than theoretical yield which is derived from the balanced chemical equation of the reaction.

For example if 5 g be the actual yield of the product in a reaction, but the theoretical or expected yield derived from the equation be 7 g.

then the percentage yield  = 5 /7 × 100 = 71.4 %.

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Answer:

The light bends

Explanation:

When it passes through two different densities it changes directions, causing a bend

Answer:

B

Explanation:

It is better to prevent waste and pollution from occurring in the first place than to clean up or treat waste after it has been produced.

Chemical products should be designed to be as safe as possible for human health and the environment while still fulfilling their intended purpose.The use of auxiliary substances such as solvents and separation agents should be minimized or eliminated if possible, and safer alternatives should be used when necessary.Chemical processes should be designed to be as energy efficient as possible, and renewable energy sources should be used when feasible. Whenever possible, chemical feedstocks should be renewable, such as using biomass instead of fossil fuels.Energy is the ability to do work or cause change. It comes in many forms, including thermal (heat), electrical, chemical, mechanical, nuclear, and electromagnetic energy. Energy is a fundamental concept in physics and is closely related to the laws of thermodynamics, which describe how energy can be transformed from one form to another, but cannot be created or destroyed.There are many sources of energy that are used to power our daily lives, including fossil fuels (such as coal, oil, and natural gas), nuclear energy, renewable energy sources (such as solar, wind, hydro, and geothermal), and biomass (organic matter used as fuel, such as wood or plant waste).

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Answer:

Volume

Explanation:

yo brother these are so easy, just study bro. I helped you answer 3 already lol

whatever.

Hope I helped :)

AnswU GOT THIS!!!!!!!!!!!!!

Explanation:

Answer:

protein??

Explanation:

im not sure, but I could be wrong!!

The phenomenon observed when water seeps into the sand in the riverbed groove can be related to certain steps of the water cycle on Earth's surface.

The water cycle, also known as the hydrological cycle, involves the continuous movement of water between the Earth's surface and the atmosphere. The steps of the water cycle being modeled as the water soaks into the sand are evaporation and infiltration.

Evaporation is the process in which liquid water transforms into water vapor, primarily from the Earth's surface. In the context of the sand riverbed, as water is added to the beginning of the groove and seeps into the sand, a portion of it is likely to evaporate. The heat from the surroundings aids in the conversion of liquid water into water vapor.

Infiltration, on the other hand, refers to the movement of water from the surface into the subsurface or soil. As the water is added to the riverbed groove, it percolates through the sand, gradually infiltrating into the pores and spaces between the sand particles.

This process mimics the natural infiltration of water into the ground during rainfall or when water seeps into the soil near rivers or lakes.

By observing the seepage of water into the sand in the riverbed groove, we can draw a parallel to the water cycle's evaporation and infiltration processes.

This modeling demonstrates how water on the Earth's surface can evaporate into the atmosphere and infiltrate into the ground, replenishing groundwater reserves or feeding into natural drainage systems.

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Answer:

0.39017 moles

Explanation:

a mole is 6.023×10^23

(2.35×10^23)÷(6.023×10^23)=0.39017

Answer:

35.5 this is the answer ok

Answer:

A= 2.3g

B= 1.2L

Explanation:

a) Find the mass of the reacted metal

2Na    +     Cl2     →    2NaCl

46               71                 117

X                                   5.85

From the chemical equation

117/5.85 = 46/x

X= (46x5.85)/117

 = 2.3g

So, the mass of the reacted metal is 2.3g

b) Find the volume of the reacted gas at STP

at STP: 71g of CL2 has 22.4l

              Y  of Cl2 has V

V= (Y x 22.4L) / 71                   where y=?

From the chemical equation

117 / 5.85 = 71 / Y

Y= (71x5.85) / 117

  = 3.55

V= (3.55x22.4) / 71

 = 1.12L

So, the volume of the reacted gas at STP is 1.12L

Answer:

True.

Explanation:

This is because when the number of protons in the nucleus increases the neutrons needed for a stable nucleus increases even more rapidly.

Best of luck!!!

Answer: 213 g

Explanation:

At a pressure of 5.0 atm, IS 200 L of gas would need to be stored in the volume tank (V2).

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molar mass of PF5 = 125.966 g/mol

125 g PF5 × (1 mol PF5/125.966 g PF5) = 0.992 mol PF5

0.992 mol PF5 × (6.022 × 10^23 molecules PF5);

= 5.97 × 10^23 molecules PF5

Since there 5 fluorine atoms per molecule of PF5,

(5.97.× 10^23 molecules PF5) × (5 atoms F/1 molecule PF5)

= 2.99 × 10^24 atoms F

Based on the increase in the number of moles of gas, the sign of the entropy change for the given process is likely to be positive (ΔSsys > 0).

Entropy (ΔS) is a measure of the disorder or randomness in a system. In this case, we are considering the system's entropy change (ΔSsys). We can analyze the given reaction without doing any calculations.

Initially, we have 1 mole of  \(N_{2}O_{5}\) (g) as a reactant. After the reaction, we have 1 mole of \(NO_{2}\)(g) and 1 mole of \(NO_{3}\)(g) as products. The number of gaseous molecules has increased from 1 to 2. More gaseous molecules mean more possible arrangements and higher disorder or randomness.

Since the disorder has increased in this reaction, the entropy change (ΔSsys) is positive. So, the correct option is: ΔSsys > 0.

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Answer:

B. electric energy then chemical energy

Explanation:

Answer:

Evaporation

Explanation:

Students are to mix the solvent to dilute completely,and get and evaporation dish,candle(heat),tripod stand...pour the solution in the evaporation dish and place it on tripod stand above the candle wait for some time the water will change into gas and to get the water they have to cover the evaporating and direct it to a different container to get the water and salt

= 18.02 g/mol) im sure its that

Answer:

Rubidium Chloride is an excellent water soluble crystalline Rubidium source for uses compatible with chlorides.

Compound Formula: ClRb

Melting Point: 715 °C

Boiling Point: 1,390 °C

Explanation:

The process of determining an approximate computed age based on the proportions of carbon isotopes present is called radiocarbon dating or carbon dating.

Radiocarbon dating is a method used to determine the age of an object containing organic material by measuring the amount of the radioactive isotope carbon-14 in the object.

Carbon-14 is a radioactive isotope of carbon that is produced in the upper atmosphere when cosmic rays collide with nitrogen atoms. When living organisms absorb carbon from the atmosphere through photosynthesis or consumption of other organisms, they incorporate a certain amount of carbon-14 into their bodies. After an organism dies, the amount of carbon-14 in its body begins to decay at a known rate, with a half-life of about 5,700 years.

Radiocarbon dating is based on the assumption that the proportion of carbon-14 in the atmosphere has remained constant over time. This assumption is generally considered valid for the past 50,000 years. Radiocarbon dating can be used to determine the age of materials such as wood, charcoal, bone, shell, and other organic remains.

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Answer:serch it up i found it on the second website

Explanation:

There are a lot you want to know about heat transfer.

If u understand the mode of heat transfer well, then heat transfer is easy to continue.

Answer:

1: They give to the body Vitamin  D 2: they give solar energy and that is what gives us revaluation around the sun (Drag) 3: it gives plants energy for photosynthesis (or dont know)

4:solar panels gives energy by the sun radio controlled area that gives us the battery's, lights etc...

Explanation:

EXPLAIN IT

The number of protons and the number of neutrons determine an  element’s atomic mass: mass number = protons + neutrons.

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number. In contrast, the number of neutrons for a given element can vary. Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu. Other atoms don’t generally have round-number atomic masses for reasons that are a little beyond the scope of this article. In general, though, an atom's atomic mass will be very close to its mass number, but will have some deviation in the decimal places. Since an element’s isotopes have different atomic masses, scientists may also determine the relative atomic mass—sometimes called the atomic weight—for an element. The relative atomic mass is an average of the atomic masses of all the different isotopes in a sample, with each isotope's contribution to the average determined by how big a fraction of the sample it makes up. The relative atomic masses given in periodic table entries—like the one for hydrogen, below—are calculated for all the naturally occurring isotopes of each element, weighted by the abundance of those isotopes on earth. Extraterrestrial objects, like asteroids or meteors, might have very different isotope abundances.

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a) Pressure of the carbon dioxide is 1.8 atm

b) Pressure of the methane is  11.5 atm

c) Total pressure is  13.3 atm

We know that the pressure would have to do with the way the gas continues to hit the walls of the container in which we can find it. Now we know that we have;

Number of moles of carbon dioxide = 6.5 g/44 g/mol = 0.15 moles

Number of moles of methane = 15.2 g/16 g/mol = 0.95 moles

Using the Ideal gas equation;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

Then;

P = nRT/V

For carbon dioxide;

P = 0.15 * 0.082 * 294/2

P = 1.8 atm

For methane;

P = 0.95 * 0.082 * 294/2

P = 11.5 atm

Total pressure =  1.8 atm +  11.5 atm = 13.3 atm

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A 30% (w/v) solution of vitamin C was diluted to 200 ml. The weight/volume percent concentration of the resulting solution is 15%.

To find the weight/volume percent concentration after diluting, we need to use the formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given:

C1 = 30% (w/v)

V1 = 100 mL

V2 = 200 mL

Using the formula, we can solve for C2:

C1V1 = C2V2

(30%)(100 mL) = C2(200 mL)

C2 = (30%)(100 mL) / (200 mL)

C2 = 15%

Therefore, the weight/volume percent concentration of the 100 mL of 30.0% (w/v) solution of vitamin C after diluting to 200 mL is 15%.

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