a sample of nitrogen at 18oc was compressed from 300.0 ml to 0.690 ml and its new pressure was found to be 400.0 kpa. what was the original pressure in pa?

Answer: Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system

Explanation:

Chemical energy is the energy that is (option c) present within atoms and molecules.

Chemical energy is a form of potential energy that is stored within atoms and molecules. This energy is a result of the arrangement of electrons within the atoms and the chemical bonds that hold the atoms together. When a chemical reaction takes place, this stored energy is either released or absorbed.

Chemical energy is not added to a reaction in the form of heat, although heat can be a factor in releasing stored energy. It is not caused by the movement of electricity, although electricity can be used to release energy in some cases. Chemical energy is present within atoms and molecules regardless of external factors such as heat or electricity.

The energy stored within chemical bonds can be released in the presence of oxygen, through a process called oxidation. This reaction releases the stored energy in the form of heat, light, or electricity. However, not all chemical reactions require oxygen to release energy. For example, the breakdown of glucose in the absence of oxygen (anaerobic respiration) releases energy in the form of ATP.

In conclusion, chemical energy is a form of potential energy that is stored within atoms and molecules. The correct option is (c).

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The three stable isotopes of carbon are carbon-12, carbon-13, and carbon-14.

Carbon has three stable isotopes which are carbon-12, carbon-13, and carbon-14. The most abundant isotope is carbon-12, which constitutes 98.93 percent of all natural carbon. Carbon-13 is another stable isotope of carbon, which is less abundant, comprising about 1.07% of all carbon on Earth.

Carbon-14 is less abundant and is considered a radioactive isotope of carbon with a half-life of 5,700 years, although its concentration is extremely low as it makes up only 1 part per trillion of all carbon on Earth. Carbon isotopes have numerous applications in a variety of fields such as geochemistry, carbon dating, tracing metabolic pathways, and estimating fossil fuel emissions, among others.

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The equilibrium expression for the reaction given in the question is:

[H₂]⁴ / [CH₄][H₂O]²

Equilibrium constant, K for a given chemical reaction is written as illustrated below:

nReactant ⇌ mProduct

Equilibrium constant (K) = [Product]ᵐ / [Reactant]ⁿ

Where

Note: The above equation only applies to gaseous reactants/products and aqueous reactants/products

With the above information in mind, we shall determine the equilibrium expression for the reaction. Details below:

Equilibrium expression = [Product]ᵐ / [Reactant]ⁿ

= [H₂]⁴ / [CH₄][H₂O]²

Thus, we can conclude that the equilibrium expression is [H₂]⁴ / [CH₄][H₂O]²

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Answer:

9.68x10^21 molecules of nitrogen

Explanation:

I will assume that r.t.p. is supposed to be STP, Standard Temperature and Pressure.  rtp might refer to room temperature and pressue, but no value is given for room temperature, so let's assume standard temperature (0 degrees Celsius).  Here is a marvelous, and useful, property of gasses at STP:  One mole of gas at STP occupies 22.4 liters.  Let's make that a conversion factor:  (1 mole/22.4 liters).

We have the volume of gas at STP:  360 cm^3.  Convert that into liters:

(360cm^3)*(1 ml/cm^3)*(1 liter/1000 ml) = 0.360 liters(L)

Now use the conversion factor from above to convert the volume of gas into moles of gas:

 (0.360L)*(1 mole/22.4 liters) = 0.0161 moles of gas

By definition, 1 mole is 6.02x10^23 particles, or molecules of the gas.

Convert moles of the gas to molecules:

(0.0161 moles)*((6.02x10^23 molecules)/mole) = 9.68x10^21 molecules of nitrogen.

Given the equation 4Al +3O2 --> 2Al2O3 if 325 grams of Al2O3 are to be formed, 101.77 grams is the mass of aluminum that must be reacted with excess oxygen. So, the correct option is 101. 77g Al

To find the amount of aluminum required to form 325 grams of Al2O3, we can use the balanced chemical equation: 4Al + 3O2 --> 2Al2O3. This equation tells us that for every two molecules of Al2O3 that are produced, four moles of aluminum and three moles of oxygen must react.

From the equation, we can see that the ratio of Al to Al2O3 is 2:4, so for every gram of Al2O3 produced, 2/6 grams of aluminum must be used. To produce 325 grams of Al2O3, we need 325 x 6/2 = 975 grams of aluminum.

Therefore, the mass of aluminum that must be reacted with excess oxygen is 975 grams, or approximately 975/28.35 = 34.59 moles, or approximately 101.77 grams.

Therefore, the answer is 101.77 grams of Al.

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Dissolving sugar in water is an example of a physical change.

In a physical change, the substances involved do not undergo a change in their chemical composition. Instead, they change in their form, state, or appearance. When sugar is dissolved in water, its solid crystals become dispersed in the water, but the sugar molecules themselves remain unchanged. This process is reversible, as the sugar can be recovered by evaporating the water.

In contrast, paper burning, fireworks exploding, bread rotting, and digesting food are examples of chemical changes. In a chemical change, the substances involved undergo a change in their chemical composition, forming new substances with different properties. These processes are typically irreversible. For instance, when paper burns, it reacts with oxygen to produce new substances like carbon dioxide and ash, and the original paper cannot be retrieved.

In summary, a physical change like dissolving sugar in water involves a change in the state or appearance of a substance without altering its chemical composition, whereas chemical changes involve the formation of new substances with different properties.

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The right answer is true. It is accurate to say that because liquids and solids are almost incompressible, pressure has little impact on their solubility.

We are aware that the concept of compressibility refers to how the study object's qualities can alter simply by applying pressure on it. Whether or not a solid, liquid, or gas can have a solubility that is influenced by the substance's pressure depends on the compressibility factor. We must keep in mind that when we discuss pressure in science, our thoughts must immediately turn to the force per unit area of the substance that is being investigated in each specific example. Because the solid and liquid have a fixed volume while the gas does not, the gas will take on the volume of the container it is carried in, proving that the solid and liquid are less compressible than the gas.

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It is accurate to say that because liquids and solids are nearly incompressible, pressure has minimal impact on their solubility.

Pressure has very little or no impact on how easily particles dissolve in liquid. This is due to the fact that solids and liquids are largely unaffected by changes in pressure due to their incompressibility. The solubility, which depends on gas pressure, is a measurement of the concentration of dissolved gas particles in the liquid. A gas's solubility increases with higher pressure while falling with lower pressure because of an increase in collision frequency. · The solubility of liquids and solids is mostly unaffected by external pressure. The concentration of dissolved gas molecules in the solution at equilibrium is higher at higher pressures because the concentration of molecules in the gas phase rises with increasing pressure.

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Explanation:

1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.

if u looking for N it is from group 5A so its valency is -3

so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A

for the transition metals and simimetals other rules.

2) neutral if the element does not hold any charge like

H2, O2, N2, Fe, Au, Cu ...

isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.

if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)

F- then it is fluoride anion (-ion)

if u have any doubt just writ a comment ( ;

Answer:

mass=279grams

Explanation:

GIVEN DATA

number of atoms=3.01×10^23

avogadro's number=6.022×10^22

molar mass of iron=56g/moles

TO FIND

mass in gram of iron=?

SOLUTION

by using the formula

mass in gram=(number of atoms÷avogdro's number)×molar mass

mass=(3.01×10^23÷6.022×10^23)×56

mass=0.499×56

mass=27.9grams=28 grams

A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the  chemical formula for the compound is (NH₄)₂SO₄.

The ammonium ion is a polyatomic cation - NH₄⁺ and the polyatomic anion that is sulfate ion - SO₄²⁻. The polyatomic cation and the polyatomic anion combine and for the polyatomic ionic com pounds. Ionic bond is formed between a positively charge ion and the negatively charge ion.

Thus, A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the  chemical formula for the compound is (NH₄)₂SO₄.

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Answer: 3.2 grams

Explanation:

took the quiz

The  methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas is 3.6 grams. option B is correct.

Methanol is also known as methyl alcohol or wood spirit, it is the  long series of organic compounds called alcohols, having a methyl group (CH 3) attached with a hydroxy group (OH). Methanol was formerly made by the process of destructive distillation of wood.

Here, 2.8  grams of carbon monoxide reacts with 0.50 grams of hydrogen gas as there are 4 hydrogen molecules add 2.8 + 0.50 × 2 = 3.6 grams.

Therefore, methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas is 3.6 grams. option B is correct.

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The statement that is true about the molarity of the solution is that 5.0 moles of a solute is dissolved in 1.0L of solution (option D).

Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.

The molarity or concentration of a solution is a function of the number of moles of solute it contains and the volume of the solvent it is dissolved in.

This suggests that if a solution has a concentration of 5.0M, it has a solute of 5.0moles dissolved in 1.0L of solvent.

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Answer:

- energy released by nuclear reaction is much greater than energy released by chemical reaction.

Explanation:

This is because nuclear bombs rely on nuclear reactions, which release energy from the splitting of atomic nuclei or the merging of atomic nuclei, whereas non-nuclear bombs rely on chemical reactions, which involve the breaking and forming of chemical bonds. Nuclear reactions release many orders of magnitude more energy than chemical reactions, resulting in much greater destructive power.

The empirical formula, which represents the simplest ratio of atoms in a compound, may be useful in the lab setting but not useful for predicting the properties and functions of materials.

In the lab, the empirical formula can be useful for identifying the composition of a compound, especially if the molecular formula is unknown. It can also help in determining the stoichiometry of a reaction, which can be important for conducting experiments. However, the empirical formula does not provide information about the actual number of atoms or the arrangement of atoms within a molecule, which can greatly affect the properties and functions of a material.

Therefore, while the empirical formula can be a useful tool in the lab setting, it may not be sufficient for predicting the properties and functions of materials. More detailed information about the molecular formula and structure is needed for accurate predictions.

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no it cannot I hope I helped

Answer:

Can not

Explanation:

Because both are salts of sodium and hydroxide

Answer:

Copper (I) hydroxide

Explanation:

Copper (I) hydroxide is a chemical compound with the chemical formula of CuOH. One copper atom (Cu), one oxygen atom (O), and one hydrogen atom (H.)

Answer:

please read the answer above

The state change occurs when the glass melts.

The matter is anything that has mass and occupies space.

The different states of matter are solid, liquid, gas, and plasma.

The properties of the different types of matter can be understood by looking at the arrangement of molecules.

When a solid substance is heated beyond its melting point, it changes its state from solid to liquid.

When liquid is heated beyond its vaporizing point, it changes its state from liquid to gas.

Solids are closely packed and have a definite shape and size.

Liquids are loosely packed and take up the space of the container.

Gas has high intermolecular spacing and the gases are not rigid.

Ground glass is melted under light heat and poured into molds.

Recycling glass involves changing the state of glass from solid to liquid state.

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When 7.35 l of nitrogen gas and 26.04 l of hydrogen gas were allowed to react, then the amount of gas that are formed is 14.7 L.

The balanced chemical reaction is given as,

N₂ + 3H₂ → 2 NH₃

Using the coefficients of the balanced chemical equation, we convert both initial volumes of gases to liters of ammonia as shown. The least amount produced will come from the limiting reagent and is the theoretical yield for the reaction.

7.35 L N₂ × 2 L N₂/1 L N₂ = 14.7 L NH₃

26.04 L N₂ × 2 L N₂/3 L N₂ = 17.36 L NH₃

Therefore, the theoretical yield of NH₃ is 14.7 L.

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All the living organisms need water to survive in the earth. The transport of water can be considered as a solution of water supply on earth. Most of the people suffers from water scarcity.

Water is regarded as the universal solvent and plays an important role in the survival of all living organisms. The preservation of water mainly refers to protect and control the use of water and its associated resources.

It is very important to preserve water. Because everyday the population is increasing and the water resources are reducing. The preservation of water helps us to supply large amount of water for longer usage.

Some methods to preserve water are:

Water supply means providing water to the public. Here water is supplied through pipes, pumps, etc. To make healthy individuals in our society transport of water is essential.

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In a mining community, water pollution kills the fish in local river.

Large amounts of water are frequently used in mining, which has the potential to contaminate local groundwater, rivers, streams, and other water sources. A community's ability to grow its own food may be hampered by mining since it consumes grazing or agricultural land and pollutes the soil and the environment.

Metals that leach from the rock also contaminate nearby water sources when they do so. chemical processing pollution: When minerals are extracted from their ores using cyanide or sulfuric acid and water, the runoff pollutes the rivers in the area.

Through erosion and sedimentation, dewatering of wetlands, diverting and channelizing streams, and poisoning surface water and aquifers with harmful chemicals, surface mining can have an impact on fish and aquatic resources.

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Answer:

a

Explanation:

The increase in pressure when a basketball is pumped up is caused by the change in the number of molecules (optionC).

When air is pumped into a basketball, the air molecules are forced into a smaller space, which increases the number of molecules in that space. This increase in the number of molecules leads to an increase in the pressure of the gas within the ball.To better understand why this is the case, we can use the ideal gas law, which describes the behavior of gases under various conditions. The ideal gas law is expressed as PV = nRT, where P is pressure, V is volume, n is the number of molecules, R is the gas constant, and T is temperature.
When air is pumped into a basketball, the volume of the ball remains the same (assuming the ball is rigid and does not expand), and the temperature of the air inside the ball does not change significantly. Therefore, according to the ideal gas law, the only way the pressure can increase is if the number of molecules (n) increases.
This increase in pressure is what makes the ball bouncy and allows it to be used for games and activities. It is important to note that overinflating a basketball can lead to a rupture or bursting of the ball due to the excessive pressure created by the increased number of molecules.

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3.4 mole of H₂SO₄ moles of sulfuric acid (H₂SO4) are needed to react completely with 6.8 moles of lithium hydroxide.

How many moles of sulfuric acid (H₂SO4) are needed ?

Based on the reaction’s stoichiometry: 2 LiOH + H2SO4 Li2SO4 + 2 H2O

It is obvious that when 2.0 moles of LiOH react with 1.0 mole of H2SO4, 1.0 mole of Li2SO4 and 2.0 moles of H2O are produced.

Making use of cross multiplication:

1.0 mole of H2SO4 totally interacts with LiOH (2.0 moles)

2.0 mole of H2SO4 is required to totally react with 6.8 mole of LiOH.

The mole of H2SO4 = (1.0 x 6.8) / (2.0) = 3.4 mole of H2SO4.

One mole of H2SO4 has an atomic mass of 98 grams. So 98 grams of H2SO4 comprises one mole of H2SO4 molecule, or seven moles of atoms.

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Answer

Explanation

In the Lewis Dot structure, S = N - A is used to calculate the total number of shared and unshared electrons in a molecule.

S represents the TOTAL number of valence shared electrons in a molecule to achieve an octet, N represents the sum of the number of valence electrons of all the atoms of the molecule, and A is the number of valence electrons in an electron pot.

For SiCl₄, the valence electron on each atom coming together to form the molecule is:

Valence electron on Si = 4

Valence Electron on Cl = 7

Total valence electron on SiCl₄ = 4 + (4 x 7) = 32

The least electronegative Si atom is placed at the center, and four Cl atoms are connected with a single bond.

A single bond takes up 2 valence electrons, so for four bonds, 8 valence electrons have been occupied, and we are left with 32 - 8 = 24 valence electrons.

Thus, in the Lewis Dot structure S = N - A , the TOTAL number of valence electrons in a molecule to achieve an octet of SiCl₄ to achieve an octet is