Calculate the mass of oxygen that combines with 20.4g of magnesium to form 34.0g of magnesium oxide

Final answer:

To find the volume of 2.00 moles of hydrogen gas at STP, multiply the number of moles by the standard molar volume, 22.4 L/mol, resulting in 44.8 liters.

Explanation:

The volume of hydrogen gas at STP (Standard Temperature and Pressure) can be found using the standard molar volume. By definition, the standard molar volume of an ideal gas at STP, which is 0°C (273 K) and 1 atm pressure, is 22.4 liters per mole.

For 2.00 moles of hydrogen gas at STP, the calculation simply involves multiplying the number of moles by the standard molar volume:

Thus, 2.00 moles of hydrogen gas at STP occupy a volume of 44.8 liters.

Answer:

faster.

Explanation:

Particles of water in the gas coming out of a pot of boiling water are moving faster than particles of water in the pot.

This is because the heat energy makes the molecules move faster, so the molecules "trapped" in the liquid are able to gradually break down the barriers of the liquid-air interface and, therefore, the amount of water. it decreases until it "disappears". When you boil water, that smoke you see coming out is nothing more than a bunch of molecules that have broken through the barrier and are free, gaseous. This was due to the rapid movement of these molecules.

We want to see what happens to the particle's speed in a given material as the temperature changes (increases in this case) and it faces a change of phase.

We will see that the particles in the gas (vapor of water) have a larger speed than the ones in the liquid water.

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To see this, first, we need to understand how the temperature manifests in a given material.

As we increase the temperature of the material, the kinetic energy of the particles that make the material increase (thus the speed increases). This causes the particles to move more, and this is why as we increase the temperature, is likely to see an increase in the volume.

This is the reason of why we usually see that a solid has less volume than a liquid, and a liquid has less volume than a gas (for the same mass of the same material).

Then as we increase the temperature of liquid water and that water starts to change of phase (by boiling) the kinetic energy of the particles increase, and thus, the speed increases.

Then the particles will be moving faster than the particles of the water in the pan.

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Xenon does not typically form a monatomic ion.

In this question, we need to identify the element that does not form a monatomic ion. A monatomic ion is an ion consisting of only one atom.

Potassium (K) forms a monatomic ion with a charge of +1, sulfur (S) can form a monatomic ion with a charge of -2, and chlorine (Cl) can form a monatomic ion with a charge of -1.

However, xenon (Xe) does not typically form a monatomic ion. Xenon belongs to the noble gas family and is highly stable due to its full valence electron shell, so it rarely forms ions.

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The Nuclear Model-1909

Answer:

The correct answer is number 2: herbicides can increase crop yields by killing weeds.

Explanation:

Herbicides are chemiclas used to avoid the spreding of undesired plants (weeds) on crops. These weeds would be prejudicial to the harvest, therefore, herbicide use can increase crop yields.

A physical propery of halite (table salt) is its chemical composition.

Answer:

C. smiling when you're happy

Explanation:

SInce it's just an emotion and isn't actually that nessary

Answer:5

Explanation:

5

Copper, sulfur, gold, iron, and aluminum are elements, as their symbols suggest. The other four substances are compound with two elements each.

Answer: it would be erosions

Explanation:

The natural process most likely caused the valley to canyon is tectonic uplift and erosion.

Tectonic uplift is defined as the portion of the total geologic uplift to the mean of the earth surface that is not attributable to an isostatic response to an unloading.

Tectonic plate is defined as a scientific theory explaining how large landforms are formed as a result of subsurface motions on Earth.

Erosion is defined as the geological process in which earthen materials will move away and  transported by the natural force such as wind and water.    

There are basically two types of erosion

Thus, the natural process most likely caused the valley to canyon is tectonic uplift and erosion.

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Answer: Option (b) is the correct answer.

Explanation:

A chemical reaction is the one in which there occurs change in the chemical composition of a substance in order to result in the formation of a new compound.

For example, when sugar burns then it means it is chemically reacting due to which it turns into black.

On the other hand, a physical change is the one in which there occurs no change in chemical composition of a substance. As a result, no new compound is formed.

For example, Paper absorbs liquid and sinks, Water boils and evaporates, and  Glass vibrates and shatters are all physical changes.

Thus, we can conclude that sugar burns and turns black correctly identifies a scenario that displays evidence a chemical reaction is occurring.

Answer:

its is a subtance

Explanation:

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Coffee is considered a mixture rather than a pure substance because it is made up of multiple components that can be separated. Coffee is a mixture, not a pure substance, due to the variety of components that combine to make it, such as caffeine, water, oils, and other organic compounds.

In chemistry, coffee is considered a mixture rather than a pure substance. A mixture is a combination of two or more substances that are not chemically joined together. Coffee is made up of various components such as water, caffeine, oils, and flavor compounds, which can all be separated through various methods.

For example, if you were to run a coffee extraction process using water, you would separate the soluble components of coffee from the insoluble ones. This demonstrates that coffee is not chemically pure but rather a mixture.

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A plant extract is a mixture due to the fact that it contains multiple compounds physically combined, they retain their individual characteristics. This makes the composition of extracts heterogeneous. Mixtures in the form of plant extracts are especially important in pharmaceutical science.

A plant extract is considered a mixture due to the fact that it contains multiple compounds physically combined, not chemically bonded. These compounds usually include various elements of the plant like oils, pigments, and other organic molecules, all present in varying amounts. The plant extract retains the characteristics of its individual components because they are not chemically reacting with one another, but simply mixed together, making it a heterogeneous mixture, as the same drop of the extract might have different compounds in different proportions.

This is not much unlike the example of an Italian dressing, where in different parts of the mixture you may find more oil or vinegar or herbs because the ingredients separate and settle unevenly throughout the mixture. Similarly, in a plant extract, the compounds will not be proportionately arranged in every drop of the mixture.

Particularly in pharmaceutical science, this heterogeneous nature is an advantage as different plants contain unique combinations of beneficial compounds. Examples include medicines such as aspirin and codeine, which were once derived from plant extracts. This demonstrates the importance of mixtures in medicinal applications.

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Final answer:

In K2HPO4, the ions present are potassium ions (K+) and hydrogen phosphate ions (HPO42-). Hydrogen phosphate can further dissociate, but the dissociation leading to the formation of PO43- is much less due to the small value of the equilibrium constant. Hence, the solution is basic.

Explanation:

To identify the ions present in K2HPO4, we first consider the fact that K2HPO4 is a salt derived from the reaction of a strong base (KOH) with a weak acid (H3PO4), and it is made up of potassium ions (K+) and hydrogen phosphate ions (HPO42-). In aqueous solution, K2HPO4 fully dissociates into these ions:

K2HPO4 (s) → 2 K+ (aq) + HPO42- (aq)

The potassium ions, K+, are the cationic species and the HPO42- ions are the anionic species. The hydrogen phosphate ion is an amphiprotic species, meaning it can act as both an acid and a base. This ion may further dissociate in water:

First ionization: H2PO4- (aq) → H+ (aq) + HPO42- (aq)

Second ionization: HPO42- (aq) + H2O(l) ⇌ H3O+ (aq) + PO43- (aq)

However, the second ionization, which forms PO43- and H3O+, has an equilibrium constant (K2), which is much less than that of the first ionization, indicating that it occurs to a significantly lesser extent. The solution of K2HPO4 is basic because the K2 of the HPO42- ion is much larger than the acidic dissociation constant.

Answer:

The independent variable controls the dependent variable.

Explanation:

The maximum number of electrons that can occupy the principal quantum number 5 is 50, calculated using the formula 2n² where n is the principal quantum number.

The maximum number of electrons that can occupy the fifth energy level (n = 5) of an atom is determined by the formula 2n2. For n = 5, this formula gives:

2 × 52 = 2 × 25 = 50 electrons

Therefore, the maximum number of electrons that can occupy the principal quantum number 5 is 50. This includes the possible subshells in that energy level: 5s, 5p, 5d, and 5f, with the number of orbitals in each subshell being one s-orbital, three p-orbitals, five d-orbitals, and seven f-orbitals, respectively.

The answer is C. X: Benefits

Y: Risks

Answer:

x benefits y risks

Explanation:

Answer: Option A

Explanation:

The osmosis can be defined as a biological process where the movement of the particles takes place through the semipermeable membrane.The solvent moves from a region of high concentration to low concentration.

The diffusion is same in the reference that it can also occur through the semipermeable membrane.

The particles from the higher concentration moves towards the lower concentration.

Hence, option A is correct.