Which of these is a mixture? A. Carbon Dioxide B. salt water C. calcium D. potassium

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

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: A base

Explanation:

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

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Answer:

For 1: The correct answer is Option D.

For 2: The correct answer is Option B.

For 3: The correct answer is Option A.

Explanation:

For 1:

An ion is formed when a neutral atom looses or gains electrons.

We are given:

An ion carrying a charge of +3. This means that an element is loosing 3 electrons, so it has 3 valence electrons.

The elements that belong to Group 13 of the periodic table has 3 valence electrons and form +3 ions.

Hence, the correct answer is Option D.

For the given options:

Option A: Covalent bond is defined as the bond which is formed when sharing of electrons takes place between the atoms. This is usually formed between two non-metals.

Option B: Ionic bond is defined as the bond which is formed by complete transfer of electrons from one atom to another atom. The atom which looses the electron is known as electropositive atom and the atom which gains the electron is known as electronegative atom. This bond is usually formed between a metal and a non-metal.

Option C: A polar covalent bond is formed when difference in electronegativity between the atoms is present. When atoms of different elements combine, it results in the formation of polar covalent bond. For Example: [tex]CO_2,NO_2[/tex] etc..

Option D: Hydrogen bonding is defined as the intermolecular force having partial ionic-covalent character. This type of bonding takes place between a hydrogen atom (attached with an electronegative atom e.g. O, N and F) and an electronegative atom (O,N and F).

Group 2 elements are considered as metals having general electronic configuration as [tex]ns^2[/tex]

They will loose 2 electrons to form [tex]X^{2+}[/tex] ions and thus tends to form ionic bonds.

Hence, the correct answer is Option B.

When a positive ion gains electrons equal to the charge on the ion, the positive charge will get neutralized by the negative charge.

[tex]X^{2+}+2e^-\rightarrow X[/tex]

The ion will loose its charge and will form a neutral atom.

Hence, the correct answer is Option A.

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.

The statement is false. The introduction of harmful agents into water that degrade its quality is known as water pollution, not geo-pollution.

The statement provided in your question, "The introduction of chemical, physical, and/or biological agents into water that degrade the water quality is known as geo-pollution," is false. The correct term for this phenomenon is water pollution. Water pollution occurs when harmful substances, often chemicals and microorganisms, contaminate a body of water, rendering it harmful to the organisms that rely on it. Geo-pollution, on the other hand, refers more broadly to pollution of the Earth's geosphere, which includes the lithosphere, hydrosphere, and atmosphere.

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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.

Explanation:

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

First calculate the number of valence electrons in [tex]N_2O_3[/tex] is 28.

The lewis structure of [tex]N_2O_3[/tex] is given in an image.

The term "Lewis structure" refers to a diagram used to represent the bonding and electron distribution in a molecule or ion. It was developed by American chemist Gilbert N. Lewis.

Step 1: Count the total number of valence electrons.

N2O3 consists of two nitrogen atoms (N) and three oxygen atoms (O). Nitrogen is in Group 15 of the periodic table and has 5 valence electrons, while oxygen is in Group 16 and has 6 valence electrons. Therefore, the total number of valence electrons in N2O3 can be calculated as follows:

(2 × 5) + (3 × 6) = 10 + 18 = 28 valence electrons

Step 2: Determine the central atom.

In N2O3, nitrogen (N) is the central atom because it is the least electronegative element in the compound.

Step 3: Connect the outer atoms to the central atom.

In N2O3, each oxygen (O) atom will be bonded to the central nitrogen (N) atom. This will form a single bond between each oxygen and the nitrogen atom.

Step 4: Distribute the remaining electrons.

After forming the single bonds, we subtract the number of electrons used from the total valence electrons calculated in step 1. In this case, we have used 8 electrons (4 electrons for the two N-O single bonds).

Remaining electrons = Total valence electrons - Electrons used in bonds

Remaining electrons = 28 - 8 = 20 electrons

Step 5: Distribute the remaining electrons around the outer atoms.

Since each oxygen atom is bonded to the central nitrogen atom, we distribute the remaining 20 electrons evenly around the oxygen atoms (8 electrons for each oxygen).

Step 6: Check the octet rule and adjust if necessary.

After distributing the remaining electrons, we check if all atoms have achieved an octet (except for hydrogen, which can have a duet). In N2O3, the oxygen atoms already have an octet (8 electrons), but the nitrogen atom has only 6 electrons. To complete the octet of the nitrogen atom, we can use one pair of electrons from the adjacent oxygen atom to form a double bond between nitrogen and oxygen.

Step 7: Check the octet rule again and adjust if necessary.

After forming the double bond, all atoms in N2O3 have achieved an octet, and we have used all 28 valence electrons.

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Answer:

a.

chemical symbols.

Explanation:

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 : 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.

Answer:

All the three phases coexist at triple point.

Explanation:

The triple point of water is 0.01°C (273.16K) and 4.58 mmHg. At this temperature and pressure the water exist in all the three forms or phases.

The three phases are solid, liquid and gas.

It is like water is boiling and freezing at the same time.

If we change temperature or pressure, even slightly, one of the phases of water will disappear (based on changes made).

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.

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

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the answer is a combustion chamber  

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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Answer:  Studying atoms is important because knowledge about atoms helps people to understand the world around them and produce materials used in daily life. Also, research done on atoms has contributed to the improvement of people's lives through medicine, to the protection of the environment, and to the discovery of new things about the world and the universe.

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! :)