Sea water is _____.
an acid
a base
a neutral

The number of moles in 17.0g sodium chloride is 0.291 moles

In the International System of Units, Mole is the base unit of the amount of any substance.

The mass of NaCl is 17.0 g

The molar mass of Na is 22.99 g/mol

The molar mass of Cl is 35.45 g/mol

The molar mass of NaCl will be

(22.99 g/mol + 35.45 g/mol) = 58.44 g/mol

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\\rm Number\;of \;moles= \dfrac{17.0 g}{58.44\; g/m} =0.291 mol[/tex]

Thus, the number of moles in 17.0g sodium chloride is 0.291 moles.

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Answer: The correct answer is-

Flow of energy in an ecosystem ( a large community of life forms that interact with each other as well as their physical environment in a particular area) takes place through food chain.

A food chain is a linear network of different organisms ( occupying different trophic levels) where organisms at one trophic level consumes organisms at previous trophic level and energy flow takes place in the form of organic matter.

Producers ( such plants) prepare their own food through photosynthesis and occupy the first trophic level.

Producers are eaten by primary consumers ( which are generally herbivores such as rabbits).

Primary consumers are eaten by secondary consumers, which are then eaten by tertiary consumers that are eaten by final consumers and then decomposers ( such as Fungi).

Example- Grass → Grasshopper → Frog→ Snake → Hawk → Fungi

Answer:

348

Explanation:

Answer : Option C) Krypton - 84

Explanation : The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope of krypton is Krypton - 84.

As the natural abundance of krypton - 84 is higher than the other isotopes of the krypton, which is 56.99 percent. This the most stable form of Kr that exists in nature. Rest other isotopes are not that readily available and also not that stable as compared to Krypton - 84.

Krypton - 83 has natural abundance as 11.50 percent and krypton - 82 has natural abundance 11.59 percent.

So, this clearly explains that the most abundant krypton isotope is Krypton - 84.

To determine unpaired electrons, look at the valence electrons in an ion's molecule, accounting for extra or absent electrons due to the ion's charge. For instance, O2- and F2+ have one unpaired electron, but N22- is not a valid ion, and O22- electrons are all paired.

To determine if a molecular ion will have one or more unpaired electrons, we need to look at the number of valence electrons in the molecule and take into account any extra or absent electrons due to the charge of the ion.

For example, O2- has 12 + 1 = 13 valence electrons (6 from each oxygen atom and 1 extra due to the negative charge). It requires 14 for all the electrons to be paired (2 in each oxygen's inner shell and 4 bonds or lone pairs in the outer shell), thus there is one unpaired electron in O2-.

However, in F2+, there are only 13 electrons because one electron is lost due to the positive charge. Like oxygen, fluorine also prefers to have 7 electrons in its outer shell, so there are also unpaired electrons in F2+.

N22- doesn’t exist because nitrogen normally forms triple bond and doesn’t need or want to take extra electrons, so this molecular ion is not valid.

O22- has 14 + 2 = 16 valence electrons and this total number of valence electrons is an even number, which indicates all the electrons are paired.

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Answer: We need 0.216 moles of Ba(OH)2 to completely neutralize 0.432 moles of HC2H3O2.

Explanation:

2 CH3COOH + Ba(OH)2 = Ba(Ch3COO)2 + 2 H2O

0.432moles CH3COOH x [1 mol Ba(OH)2/ 2 moles CH3COOH]  = 0.216 moles Ba(OH)2

Final answer:

The temperature records show that high and low temperatures have varied over time and location, with Chicago experiencing its highest at 105° in July 1995 and lowest at -27° in January 1958. The general temperature trend has shifted towards more common record high temperatures and less frequent record lows since the 1970s. Analyzing longstanding patterns is essential to understanding climate trends and making future predictions.

Explanation:

When analyzing the highest and lowest temperatures on record, several factors must be considered, such as temporal scope and geographic location. For example, in Chicago, Illinois, the highest recorded temperature was 105° in July 1995, and the lowest recorded temperature was -27° in January 1958. When reviewing temperature data over a broader historical timeline, such as the past 4.5 billion years, we see that high temperature peaks and average global temperatures at those peaks have varied significantly and are indicative of major climatic shifts.

The daily temperature range, which is the difference between the highest and lowest temperatures over a 24-hour period, can provide a more immediate understanding of temperature variation. Additionally, graphs showing temperature trends may identify specific periods with extreme temperature fluctuations, such as the highs and lows recorded during glacial and interglacial periods.

The general trend in temperature, particularly since the 1970s, shows that record-setting daily high temperatures have become more common, and unusually cold temperatures, especially during the winter, have become less common. Such patterns can provide critical insights into the ongoing discussion about climate change and global warming. While singular record highs or lows are noteworthy, analyzing the entire pattern of temperature data over time is crucial for understanding typical weather patterns and predicting future climatic changes.

Hello, the correct answer to your question is, D.  boiling and melting

I hope this helped!

The Earth is composed of four different layers. Many geologists believe that as the Earth cooled the heavier, denser materials sank to the center and the lighter materials rose to the top. Because of this, the crust is made of the lightest materials (rock- basalts and granites) and the core consists of heavy metals (nickel and iron).

Answer:

200 g/mol is the molar mass of the unknown gas.

Explanation:

Effusion is defined as volume of gas dispersed in a given interval of a time.

[tex]R=\frac{Volume}{time}[/tex]

Number of moles of gas are directly proportional to the volume occupied by the gas.

[tex]moles \propto Volume[/tex] (at constant temperature and pressure)

[tex]\frac{n_1}{V_1}=\frac{n_2}{V_2}[/tex]

If n moles of unknown gas occupies V volume then n moles of oxygen will occupy:

[tex]V_1=\frac{n\times V}{n}=V[/tex]

The n moles of unknown gas pass through a tiny hole in 75 seconds.The effusion rate is give as:

[tex]R=\frac{V}{75 s}[/tex]

The n moles of oxygen gas pass through a tiny hole in 30 seconds.The effusion rate is give as:

[tex]R'=\frac{V}{30 s}[/tex]

According to Graham law: the effusion rate is inversely proportional to the square root of molar mass of the gas.

[tex]\frac{R}{R'}=\sqrt{\frac{32 g/mol}{M}}[/tex]

[tex]\frac{\frac{V}{75 s}}{\frac{V}{30 s}}=\sqrt{\frac{32 g/mol}{M}}[/tex]

[tex]M=\frac{32 g/mol\times 75\times 75}{30 \times 30}=200 g/mol[/tex]

200 g/mol is the molar mass of the unknown gas.

The molar mass of the unknown gas that diffused in the experiment is 200 g/mol.

The given parameters;

The rate of diffusion of the gases is calculated using Graham's law of diffusion as follows;

[tex]\frac{R_1}{R_2} = \frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} } \\\\(\frac{t_2}{t_1} )^2 = \frac{M_2}{M_1} \\\\(\frac{30}{75})^2 = \frac{32}{M_1} \\\\0.16 = \frac{32}{M_1} \\\\M_1 = \frac{32}{0.16} \\\\M_1 = 200 \ g/mol[/tex]

Thus, the molar mass of the unknown gas that diffused in the experiment is 200 g/mol.

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Answer: A base

Explanation:

Ammonium hydroxide has a pH of 11.1; therefore it is a weak base

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the answer is a combustion chamber  

Answer:

200 grams, because all the atoms remain in the balloon or flask.

Explanation:

I got a 95 on usatestprep

Final answer:

The total mass of the balloon and flask remains 200 grams after the balloon inflates due to the Law of Conservation of Mass, as no mass is lost to the surroundings during the chemical reaction between vinegar and baking soda.

Explanation:

The total mass of the flask with vinegar and the balloon with baking soda will remain the same before and after the balloon inflates. When the vinegar and baking soda mix, they undergo a chemical reaction that produces carbon dioxide gas, which inflates the balloon. According to the Law of Conservation of Mass, the mass of the reactants (vinegar and baking soda) must equal the mass of the products (the contents of the balloon and flask after the reaction). Therefore, if the flask with vinegar initially has a mass of 160 grams and the balloon with baking soda has a mass of 40 grams, the combined mass before the reaction is 200 grams. After the reaction, even though gas has filled the balloon and caused it to inflate, the total mass of the system remains unchanged at 200 grams, assuming the reaction is completely contained within the balloon and flask with no loss of mass to the surroundings.

A) The most important factor for solubility is temperature

We define the solubility of a substance in a solvent at a particular temperature

a) for solids the solubility increases with increase in temperature

b) for gas the solubility decreases with increase in temperature

So temperature will have huge effect on solubility of a saturated solution

B) the amount of extra time spent stirring the solution will hardly any effect or may have a very little effect. As stirring helps in solubility and if we have a saturated solution then it will not affect the solubility of the solution

C) The solubility is affected by the pressure on solvent

For gaseous solute the solubility is proportional to the pressure exerted on the solvent. More the pressure more the solubility.

D) the other solutes may affect the solubility as they may react with the solute or may interfere with the solute solvent interaction

Hence answer is "B"

Answer:

a.

chemical symbols.

Explanation:

Answer: Option (c) is the correct answer.

Explanation:

According to law of conservation of energy, energy can neither be created nor it can be destroyed as it can only be converted from one form to another.

For example, in the given situation electrical energy is converted into heat energy.

This means that the total amount of the electrical energy is actually equal to the total amount of heat energy. As only change in the form of energy has taken place.

Thus, we can conclude that as electrical energy is converted into heat energy, the total amount in the system remains the same.

To produce 19.1 moles of water vapor when carbon dioxide is in excess, 19.1 moles of hydrogen gas are needed, based on the stoichiometry of the water-gas shift reaction.

To determine how many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation for the reaction. The reaction in question is not stated, but it is likely a form of the water-gas shift reaction, which is:

CO2 + H2 → CO + H2O

From the equation, we can see that for every mole of H2O produced, one mole of H2 is required, assuming that carbon dioxide (CO2) is in excess.

Therefore, if we have 19.1 moles of water vapor (H2O), we need 19.1 moles of hydrogen gas (H2).

Final answer:

To produce 19.1 moles of water vapor by reacting hydrogen gas with excess carbon dioxide, 19.1 moles of hydrogen gas would be required, assuming a 1:1 stoichiometry.

Explanation:

To determine how many moles of hydrogen gas are needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation:

H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)

However, the provided examples do not directly address this reaction. Instead, we can deduce from the given information that:

In a similar vein, if we assume the reaction consuming hydrogen and carbon dioxide produces water and carbon monoxide in a 1:1 stoichiometry (as in the Sabatier process), we have:

H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)

For every mole of water produced, one mole of hydrogen is required. Therefore, for 19.1 moles of water, 19.1 moles of hydrogen gas are needed.

Answer: Feeling the heat, Bruh Rabbit sits on a stump in the middle of a field of broom grass. The breeze blowing past him carries the smell of smoke away from the red-hot coal, the cause of the blaze. Bruh Rabbit watches as the flames begin to spread.

Explanation: That is the exact answer! hope this helps! :)

Answer:

c) Fractional distillation

Explanation:

A common method used to separate liquid solutions is fractional distillation.

In this process a mixture of two or more liquids that differ in their boiling points are heated. The liquid with the lowest boiling point vaporizes first which is passed onto a condenser and separated out. The same process ensues for the next liquid component until all are separated out in fractions based on their respective boiling points.

For example, consider a mixture of ethanol (b.pt 78 C) and water (b.pt 100 C). The two liquids can be separated by heating the mixture, in which ethanol separates out first followed by water.

A chemical reaction can form products which are new substances differing from the initial reactants. These chemical changes lead to formation of different types of matter. Examples include formation of water from hydrogen and oxygen, and creating table salt from Sodium and Chloride ions.

Products can form as a result of a chemical reaction. A chemical reaction occurs when two or more atoms bond together to form molecules or when bonded atoms break apart. The substances used in a chemical reaction are known as reactants and the substances produced are known as the products. For instance, if hydrogen (H) reacts with oxygen (O), it can form water (H₂O).

Chemical changes also result in formation of one or more types of matter that differ from the matter present before the change. For instance, the formation of rust is a chemical change because rust is different from the iron, oxygen, and water that were there before rust formed. Similarly, the explosion of nitroglycerin is a chemical reaction because the gases produced are very different from the original substance.

Additionally, chemical reactions can create new substances as products. For instance, Sodium and Chloride ions are the reactants in the production of table salt, with table salt being the product.

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