with the exception of water, matter ____ when heated

A. solidifies
B. contracts
C. expands
D. condenses

Answer:

3 m/s^2

Explanation:

m = 3 kg

F = 9 N

Use Newton's Second Law: F = ma

9 = 3a

a = 3 m/s^2

The cycles that involve molecules from the atmosphere being broken and rearranged into new molecules in living things are Carbon cycle and Nitrogen cycle.

The carbon cycle :

The carbon cycle is studied as two sub-cycles: One sub-cycle deals with rapid carbon exchange between the living organisms and the other deals with long-term carbon cycling by the various geologic processes. Carbon is present in the air as carbon dioxide. It gets dissolved in water and reacts with water molecules which produces bicarbonates. By land plants, bacteria, and algae, photosynthesis converts carbon dioxide into the organic molecules. These are made by photosynthesizers which are passed through the food chains. The cellular respiration forms carbon dioxide gas by converting the organic carbon.

When organic carbon gets stored for a longer term, it happens when matter from living organisms is deep in the ground or gets sink to the ocean bottom. It results in formation of sedimentary rock. Activities of volcano, and burning of fossil fuels brings the stored carbon in the carbon cycle.

The nitrogen cycle

The nitrogen cycle is a cycle of processes which repeats. During this cycle, nitrogen moves by the living and non-living things such as soil, water, plants, animals and bacteria. Microscopic living organisms which contains one cell. To move through the separate parts of the cycle, nitrogen change its forms. Nitrogen exists as a gas N₂ in the atmosphere, but in soil it is present as nitrogen oxide NO, and nitrogen dioxide NO₂. It is used as a fertilizer and found in other forms too like ammonia NH₃. It can be processed further in a fertilizer NH₄NO₃.

The five stages in the nitrogen cycle are nitrogen fixation, mineralisation, nitrification, immobilization, and denitrification. Microbes in the soil turns the nitrogen gas N₂ in volatile ammonia NH₃. Therefore, the fixation process is called nitrogen fixation. When a chemical like NO₃ moves away from the soil or other material and gets leaked into nearby areas,  it dissolves in the water and dips out the soil which pollutes the waterways.

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Answer:

it is soluble in water

Explanation:

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Answer:

Condensation

Explanation:

Zoe is quite keen to have noticed what we call condensation. Air contains many components, one of those being water vapor. Like how sugar is soluble in water, water can be said to be "soluble" in air. Water will evaporate into the air to a certain extent. The higher the temperature of the air, the more water the air can hold. If the air has more water that it can hold (potentially because of a temperature decrease), the extra water will come out of the air. Zoe's water bottle was cold, and because the air around Zoe's bottle had cooled down, the air can not hold as much water as it could when it was warm, so the air deposited the extra water in the form of liquid water onto the bottle, giving the illusion that her bottle was sweating.

An annular eclipse looks like a bright ring in the sky. This is because the Moon is positioned farther away from Earth than during a total solar eclipse, so the Moon appears smaller than the Sun, leaving a thin ring of sunlight visible around the outline of the Moon.

Answer:

a. amount of algae on the glass

Explanation:

Physical and chemical circumstances are examples of abiotic elements, which are ecosystem components that are not alive. Because they are non-living and affect the ecosystem's characteristics, the rock composition, the quantity of algae on the glass, and the water temperature are all examples of abiotic elements in an aquarium environment.

Although the quantity of fish is a biotic element since it is a live organism and a component of the ecosystem.

Answer:

B

Explanation:

To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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A peptide bond is a covalent link produced by one amino acid's carboxyl group (-COOH) and another amino acid's amino group (-NH2). A condensation process.

between the two groups produces a molecule of water (H2O) and a peptide bond (-CO-NH-). The peptide bond has a planar, partial double bond structure. This signifies that the electrons in the bond are distributed evenly across the two atoms, although not all orbitals are involved in bonding. In the creation of polypeptide sequences, the peptide bond is critical. It connects individual amino acids to form a chain of amino acids capable of folding into specified three-dimensional structures. The function of these structures is determined by them.The polypeptide is a kind of protein. The peptide bond also permits the polypeptide to be flexible, which is necessary for its proper activity.The initial amino acid in a peptide is known as the N-terminal (NH2) residue, while the last amino acid is known as the C-termina.

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Answer:

V2 = 95.65 cm^3 or 96 cm^3 (depends on if you want to round up or not)

Explanation:

Charles law is V1 / T1 = V2 / T2 (1 means initial and 2 means final condition)

For Charles law, you must use kelvin scale for temperature. So to convert from C to K, you add 273.15

T1 = 26 +273.15 = 299.15 K

T2 = 13 + 273.15 = 286.15 K

Now plug in the values,

100 / 299.15 = V2/286.15

V2 = 95.65 cm^3 or ~ 96 cm^3

The answer should make sense because if they have a direct relation, if one goes down then the other goes down. For final condition, we lowered the temperature so our volume should have decreased too and it did (we went from 100 to 96 cm^3)

The compound CH₃OCHO is known as methyl glyoxal or pyruvaldehyde. Its molecular formula is C₃H₄O₂.

Methyl glyoxal or pyruvaldehyde is known to have a pungent odor. It has been described as having a sharp, acrid smell that is similar to that of formaldehyde or acrolein. The odor of pyruvaldehyde can be irritating to the eyes, nose, and throat, and it can cause respiratory problems if inhaled in large quantities. The odor of methyl glyoxal or pyruvaldehyde has been described in several chemical and safety databases.

One of the most important factors that predict a molecule's smell is the presence of functional groups, which are groups of atoms that impart characteristic chemical and physical properties to a molecule. The pungent odor of methyl glyoxal is thought to be associated with its carbonyl functional group (C=O), which is a common feature of many aldehydes and ketones. In the case of methyl glyoxal, the carbonyl group is located at the center of the molecule, and it is flanked by two methyl groups and a hydroxyl group, which likely contribute to the molecule's overall odor.

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The molecular formula of the compound is N₂H₄

we'll begin by calculating the number of mole of the unknown gas. This can be obtained as follow:

Volume (V) = 200 mL = 200 / 1000 = 0.2 L

Pressure (P) = 1.81 atm

Temperature (T) = 25 °C = 25 + 273 = 298 K

Gas constant (R) = 0.0821 atm.L/Kmol

PV = nRT

1.81 × 0.2 = n × 0.0821 × 298

0.362 = n × 24.4658

Divide both side by 24.4658

\(n \: = \frac{0.362}{24.4658} \)

mole of compound = 0.0148 mole

mass of compound = 0.473 g

\(molar \: mass \: = \frac{mass}{mole} \\ \\ molar \: mass \: = \frac{0.473}{0.0148} \\ \\ \)

Nitrogen (N) = 0.414 g

Hydrogen (H) = 0.0591 g

Divide by their molar mass

N = 0.414 / 14 = 0.0296

H = 0.0591 / 1 = 0.0591

Divide by the smallest

N = 0.0296 / 0.0296 = 1

H = 0.0591 / 0.0296 = 2

Therefore, the empirical formula of the compound is NH₂

Molar mass of compound = 31.96 g/mol

Empirical formula = NH₂

Molecular formula = Empirical formula × n = Molar mass

[NH₂]n = 31.96

[14 + (2×1)]n = 31.96

16n = 31.96

Divide both side by 16

n = 31.96 / 16

n = 2

Molecular formula = [NH₂]n

Molecular formula = [NH₂]₂

Thus, the molecular formula of the compound is N₂H₄

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The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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Answer:

The water was flying comfortably but it didnt change the alliance between the wind.

Explanation:

the awnsers can be gotten of your acore key

The final broth temperature will be approximately 38.4°C.

When mixing two substances with different temperatures, we can use the principle of conservation of energy. The energy lost by the hot substance (broth) is equal to the energy gained by the cold substance (water), assuming no energy is lost to the surroundings. This can be expressed using the equation:

Q_lost = Q_gained

The energy lost by the broth can be calculated using the formula:

Q_lost = m_broth * c_broth * (T_final - T_initial)

where m_broth is the mass of the broth, c_broth is its specific heat capacity, T_final is the final temperature, and T_initial is the initial temperature of the broth.

Similarly, the energy gained by the water can be calculated using:

Q_gained = m_water * c_water * (T_final - T_initial)

Since the two substances reach thermal equilibrium, we can set Q_lost equal to Q_gained:

m_broth * c_broth * (T_final - T_initial) = m_water * c_water * (T_final - T_initial)

Plugging in the given values and solving for T_final, we find that the final temperature of the broth is approximately 38.4°C.

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The sentence that has an accurate punctuation is found in (Option B).

The punctuation marks are those marks that are use to make a piece of writing to have a complete meaning. A piece of writing will be meaningless if there are no attached punctuation marks.

The sentence that is correctly punctuated is;  "I bought all the ingredients for dinner: eggs, tomatoes, macaroni, and cheese—and told Molly to preheat the oven."(Option B)

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Answer:

Composition: All hydrocarbons are made up of only two types of atoms: carbon and hydrogen. They are like building blocks that contain carbon and hydrogen stuck together.

Organic Nature: Hydrocarbons are special because they are part of a group of compounds that come from living things or things that were once alive. They have carbon and hydrogen in them, which is what makes them different from other types of compounds.

Explanation:

I choose the answer A.

Glucose can be released very quickly from glycogen to provide energy

The priority of energy consumption is carbonhydrate, lipid, and protein in order.

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Therefore, glucose can be released very quickly from glycogen to provide energy. The correct option is option A.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds.

Animals store a great deal more energy in fats than in glycogen. Fats also store more energy per gram than glycogen. Glucose can be released very quickly from glycogen to provide energy.

Therefore, glucose can be released very quickly from glycogen to provide energy. The correct option is option A.

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The final pressure of the gas, when its volume is increased from 3.4 L to 4.0 L at a constant temperature, is approximately 2.55 atm.

To determine the final pressure of a gas when its volume is changed while its amount and temperature remain constant, we can use Boyle's law. Boyle's law states that the pressure of a gas is inversely proportional to its volume at constant temperature.

Mathematically, Boyle's law can be expressed as:

P1 * V1 = P2 * V2

Where:

P1 = Initial pressure

V1 = Initial volume

P2 = Final pressure

V2 = Final volume

In this case, we are given:

P1 = 3.0 atm

V1 = 3.4 L

V2 = 4.0 L

We need to find P2, the final pressure.

Rearranging the formula, we have:

P2 = (P1 * V1) / V2

Substituting the values we have:

P2 = (3.0 atm * 3.4 L) / 4.0 L

P2 = 10.2 atm / 4.0 L

Calculating P2:

P2 = 2.55 atm

Therefore, the final pressure of the gas, when its volume is increased from 3.4 L to 4.0 L at a constant temperature, is approximately 2.55 atm.

Boyle's law demonstrates the inverse relationship between pressure and volume for a gas at a constant temperature. As the volume increases, the pressure decreases, and vice versa, as long as the amount and temperature of the gas remain constant.

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Explanation:

We have to balance this equation:

___ H₂SO₄ + __ KOH ----> __ K₂SO₄ + __ H₂O

The first step is to determine the number of atoms of each element that we have on both sides of the equation.

___ H₂SO₄ + __ KOH ----> __ K₂SO₄ + __ H₂O

K: 1 K: 2

S: 1 S: 1

H: 3 H: 2

O: 5 O: 5

We have 1 atom of K on the left side of the equation and there are 2 atoms of K on the rigth side of the equation. To balance the number of K atoms we can change the coefficient for KOH and write a 2 there.

___ H₂SO₄ + 2 KOH ----> __ K₂SO₄ + __ H₂O

K: 2 K: 2

S: 1 S: 1

H: 4 H: 2

O: 6 O: 5

We balanced the K. The S atoms are already balanced. Let's focus on H. We have 4 atoms of H on the left and 2 atoms of H on the right side of the equation. We can change the coefficient for H₂O and write a 2 there to get 4 atoms of H on the right side.

___ H₂SO₄ + 2 KOH ----> __ K₂SO₄ + 2 H₂O

K: 2 K: 2

S: 1 S: 1

H: 4 H: 4

O: 6 O: 6

We balanced the H and we also changed the number of O atoms on the right side and also balanced them. The balanced equation is:

H₂SO₄ + 2 KOH ----> K₂SO₄ + 2 H₂O

Answer: H₂SO₄ + 2 KOH ----> K₂SO₄ + 2 H₂O

The balanced equation of the redox reaction is given as follows:

The balanced equation of the reaction is determined using the half-reaction method.

The given equation of the redox reaction is:

H₆TeO₆ + Br₂ ----> TeO₂ + BrO₃⁻

Reduction half-reaction:

H₆TeO₆ → TeO₂

The oxidation state of Te changes from +6 to +4, showing that it has lost gained electrons.

H₆TeO₆ → TeO₂ + 2e⁻

Oxidation half-reaction:

Br₂ → BrO₃⁻

The oxidation state of Br changes from 0 to +5, showing that it has lost five electrons.

Balancing the electrons transferred and the atoms by adding electrons, H₂O, and H⁺ to the appropriate sides:

Br₂ + 6 H₂O → 2 BrO₃⁻ + 12 H⁺ + 10 e⁻

The number of electrons transferred in both half-reactions balanced is  by multiplying the oxidation half-reaction by 5 and the reduction half-reaction by 2:

5 (H₆TeO₆ → TeO₂ + 2 e⁻) → 5 H₆TeO₆ → 5 TeO₂ + 10 e⁻

2 * (Br₂ + 6H₂O → 2 BrO₃⁻ + 12 H⁺ + 10e⁻) → 2 Br₂ + 12 H₂O → 4 BrO₃⁻ + 24 H⁺ + 20 e⁻

The two half-reactions are added together and the electrons are canceled out to obtain the balanced redox reaction:

5 H₆TeO₆ + 2 Br₂ + 12 H₂O → 5 TeO₂ + 4 BrO₃⁻ + 24 H⁺

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Answer:

The correct answer is 0.020 atm.

Explanation:

Partial pressure is calculated by using the formula,

Partial pressure = Mole fraction × Total pressure

The partial pressure of oxygen in a mixture can be calculated by using the formula,  

Mole fraction of oxygen in mixture = Number of moles of oxygen / No. of moles of oxygen + No. of moles of Helium

(1 gg or gigagram is equal to 10⁹ grams)

= 2 × 10⁹/32 /2 × 10⁹/32 + 98 × 10⁹ / 4

= 2.54 × 10⁻³

Now the partial pressure of oxygen = Mole fraction of oxygen × Total pressure of oxygen

= 2.54 × 10⁻³ × 8.0 atm

= 0.02032 atm

= 0.020 atm

Answer:

The gravitational pull between the gas and dust matter leads to the formation of new galaxies

Explanation:

My teacher went over the answers and said that one was correct.

A nebula contains large amounts of dust and clouds. The gravitational pull between the gas and dusť matter leads to the formation of new galaxies does gravity play inside of nebulae. Therefore, option A is correct.

Gravity is the force that pulls objects toward the center of a planet or other body. The gravitational force keeps all the planets in orbit around the sun.

Gravity pulls you toward the ground because all objects with mass, such as our Earth, actually bend and curve the fabric of the universe, known as spacetime. Gravity is the curvature of the earth.

A nebula is densely packed with dust and clouds.The gravity play a role inside nebulae, The gravitational pull between gas and dus matter leads to the formation of new galaxies.

Thus, option A is correct.

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Answer:

Part A: Protonation, Protonation

Part B: An elimination, A substitution

Explanation:

The dehydration ethanol and the condensation of ethanol all begin from the protonation of ethanol. This is because, water is a good leaving group. Thus, the protonation of the -OH moiety of the molecule is the first step in each mechanism.

The dehydration of ethanol is an elimination reaction because it involves the loss of H-O-H from the ethanol molecule while the condensation of ethanol is an substitution reaction because the -OH moiety is replaced by -OCH2CH3.

The first step of the reaction, we have  reaction between a nucleophile and an electrophile.

We can see that in the first step of the reaction, we have  reaction between a nucleophile and an electrophile. In this case, the electrophile would have to be an alkyl halide which produces a carbocation as show in the image attached.

What we have here is quite similar or  like most of the organic reactions, this reaction occurs in a number of detailed or smaller steps and each step of the reaction is going to help to bring us closer to the end product of the entire steps of the reaction which is wat we target as we carry out the particular reaction.

The second step involves the reduction of the alkyne with the use of a Lindlar catalyst. As such the reaction is poisoned and it stops at the alkyne stage rather than going on to obtain the alkane.

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The final mass concentration of salt in the solution in g/l is 36.06 g/L.

The mass concentration of the mixture of the two salt solutions is calculated as follows:

Concentration of solution 1 = 15 g/l

mass of salt in the 250 mL solution = 15 g/l * 250 mL * 1 L/1000 mL

mass of salt in the 250 mL solution = 3.75 g

Concentration of solution = 6% (m/v)

This means that in 100 mL solution, 6 g of salt in present.

In 1000 mL or 1 L solution, 60 g of salt will be present.

Hence, the concentration of solution = 60 g/L

mass of salt in the 220 mL solution = 60 g/l * 220 mL * 1 L/1000 mL

mass of salt in the 220 mL solution = 13.2 g

Total mass of salt in the mixture = 16.95 g

Total volume of solution = 470 mL

Final mass concentration of solution = 16.95 g / 470 mL * 1000 mL/L

Final mass concentration of solution = 36.06 g/L

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The temperature inside the freezer is approximately -164°C.

To solve this problem, we can use the combined gas law equation:

\((P1V1)/T1 = (P2V2)/T2\)

where P is the pressure, V is the volume, and T is the temperature of the gas.

We know that the initial volume of the balloon is 145 mL and the final volume is 35 mL. We also know that the initial temperature is 25°C or 298 K, and we need to find the final temperature.

Assuming the pressure of the gas remains constant, we can rearrange the combined gas law equation to solve for the final temperature:

\(T2 = (P2V2/T1)(P1/V1)\)

Plugging in the values we know, we get:

\(T2 = (1 atm * 35 mL/298 K)(1 atm/145 mL) = 0.0808 atm/mL\)

Multiplying both sides by 298 K and dividing by 0.0808 atm/mL, we get:

T2 = 109.15 K or approximately -164°C

Therefore, the temperature inside the freezer is approximately -164°C.

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Explanation:

The metal potassium and nonmetal chlorine will react together to form potassium chloride.

The formula for the cation potassium is K+. The anion chloride is Cl-. If we combine them to form a neutral compound we get:

Answer: A. KCl