check the correct statements about carbon dioxide. phase diagram select one or more: a. at -50oc and 1 atm, carbon dioxide is in the gaseous state. b. at 1 atm carbon dioxide sublimes as it warms above the melting point. c. at -40oc and 8 atm, carbon dioxide is in the liquid state. d. as the temperature drops from -30oc to a minus -80oc at 10 atm, carbon dioxide freeze

Answer:

1)Around 450 B.C., the Greek philosopher Democritus introduced the idea of the atom.

2)All matter is made of atoms, Atoms are indivisible and indestructible.Compounds are formed by a combination of two or more different kinds of atoms, A chemical reaction is a rearrangement of atoms.

3)B

Explanation:

Answer:

An open flask half-filled with water at 25°C will eventually reach phase equilibrium as the water molecules at the surface evaporate and enter the air, while some air molecules dissolve into the water. Eventually, the rate of evaporation will equal the rate of condensation, and the system will reach dynamic equilibrium.

The time it takes to reach phase equilibrium depends on various factors such as the surface area of the water, the temperature, humidity, and air movement. In a still room with a moderate humidity level, it may take several hours for the water to reach phase equilibrium. However, in a hot, dry, and windy environment, the equilibrium could be reached much faster, perhaps in a matter of minutes.

Explanation:

Answer:

I don't understand what you are asking

To separate the mixture of water, salt, iron filings, sand, and Styrofoam, you can follow the following steps:

By following these steps, you can separate the different components of the mixture effectively.

Answer:

Frequency

Explanation:

When we talk about crests, we are referring to the high points of a wave.

We measure wave frequency by counting out the the number of crests (or high points) of a given wave that pass by a given point in a set amount of time. Thus, the higher the number of crests, the greater the frequency of the wave and vice versa.

We define the frequency of a wave as the number of waves that passes by a fixed point within a given period of time.

The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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Answer:

Yes, that is correct!

Explanation:

Answer:

Yes

Explanation:

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

The distances between galaxies are expected to increase.

This is due to the endless expansion of the universe, proposed by cosmological inflation.

An unknown quantity of gas takes up 30.7 liters at a pressure of 1.58 atm and a temperature of 93.4oc. There are approximately 1.94 moles of gas in the sample.

To find the number of moles in the gas sample, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the given temperature of 93.4oC to Kelvin. This can be done by adding 273.15 to the Celsius temperature, giving us a temperature of 366.55 K.

Next, we can plug in the given values and solve for n:

(1.58 atm) (30.7 L) = n (0.08206 L·atm/mol·K) (366.55 K)

Simplifying this equation gives us:

n = (1.58 atm) (30.7 L) / (0.08206 L·atm/mol·K) (366.55 K)

n = 1.94 mol


It is important to note that the ideal gas law is based on certain assumptions, including that the gas is in a state of equilibrium and that the molecules are not interacting with each other. In real-world situations, these assumptions may not hold, and other gas laws or equations may need to be used.

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Answer:

A derived unit is defined as the unit that is created from a  product of SI base units. Volume is an example of derived unit because it is not possible to measure volume directly using any measuring device For eg., Volume of water in bucket is can not be measured using rule, or scale, or any other measuring device.

Hence, volume is a derived unit.

The sun provides energy to the leaves through photosynthesis. It converts the sun's rays into sugar and provides energy to the leaves.

When sunlight hits the leaves packets of light called photons bounce off the chlorophyll molecules. In doing so it knocks electrons out of orbits around the magnesium atom. Electrons have a negative charge, so the loss of an electron produces a positively charged magnesium ion. Plants absorb energy from the sun through a process called photosynthesis to power processes necessary for survival.

Harvest the sun's energy with the help of chlorophyll in the cells of the leaves. Chlorophyll captures and packs energy from the sun's light in a process called photosynthesis. Leaves usually have a large surface area to maximize sunlight. Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce oxygen and energy in the form of sugars. The more light a plant is exposed to, the less chlorophyll it synthesizes.

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Answer:

please mark brainlest and it's  Procedure 1: One of the products was a gas that escaped into the air.

Procedure 2: A gas from the air reacted with one of the other reactants

Explanation:

the gas ca evaporate so it would'nt be a or c and b dosent make sense.

Condensation polymerization involves the joining of monomers through the formation of covalent bonds and the release of a small molecule, such as water or methanol, as a byproduct. Examples of condensation polymers include nylon and polyester. On the other hand, addition polymerization involves the joining of monomers through the formation of a single covalent bond, without the release of any byproducts. Examples of addition polymers include polyethylene and polystyrene.

This process typically occurs when monomers contain two functional groups that can react with each other, such as carboxylic acids and amines.
On the other hand, addition polymerization does not produce any byproduct molecules. It involves the opening of a double bond in a monomer, followed by the joining of the monomers to create a long polymer chain. This type of polymerization is common with monomers containing carbon-carbon double bonds, such as ethylene and styrene.
In summary, condensation polymerization results in the formation of a small molecule as a byproduct, while addition polymerization does not. Both processes are essential for producing a wide variety of polymers with different properties and applications.

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Answer:

2 Al + 6 HCl → 3 H2 + 2 AlCl3

Explanation:

Starting with Cl and H, after writing down 3 and 2 as coefficients on the products side, and then balance on the reactants side with 2 and 6 to get each side to equal to each other

Answer: they are important for one, they cant be combined

Explanation: i cant really explain

Hydrogen bonds have similar bond strength as ionic bond interactions in aqueous solutions.

Ionic bonds are formed between positively and negatively charged ions and are characterized by a large difference in electronegativity between the atoms involved. The bond strength of ionic bonds is quite high. In aqueous solutions, hydrogen bonds also have a relatively high bond strength, as they are formed between a partially positively charged hydrogen atom and a partially negatively charged atom, such as oxygen or nitrogen. Hydrogen bonds are weaker than ionic bonds, but they are still relatively strong compared to other types of interactions such as dipole-dipole interactions or London dispersion forces. Hydrophobic clustering and nonpolar covalent bonds are not as strong as hydrogen or ionic bonds.

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Answer:

3.56x10²³ atoms

Explanation:

To solve this question we need first to determine the moles of iron (II) chloride, FeCl₂, using its molar mass. Then, using Avogadro's number we can solve for the number of atoms:

Moles FeCl₂ - Molar mass: 126.751g/mol-

25g FeCl₂ * (1mol / 126.751g) = 0.1972 moles

Number of atoms:

1 mole of FeCl₂ are 6.022x10²³ molecules of FeCl₂, that means 0.1972moles are:

0.1972mol * (6.022x10²³ molecules / 1mol) = 1.188x10²³ molecules of FeCl₂

In 1 molecule of FeCl₂ there are 3 atoms (1 of Fe and 2 of Cl), in 1.188x10²³ molecules of FeCl₂ there are:

1.188x10²³ molecules of FeCl₂ * (3atoms / molecule) =

Answer:

c

Explanation:

Acids have a sour taste but bases have a bitter taste

At the resting membrane potential, the membrane is most permeable to potassium ions (K+), which move out of the cell due to its concentration gradient and the negative charge inside the cell.  Correct answer is option: E.

This movement of K+ ions out of the cell contributes to the negative resting membrane potential of approximately -70 mV in most cells.  The resting membrane potential is maintained by the selective permeability of the cell membrane, which allows for the movement of certain ions across the membrane. In general, the membrane is less permeable to sodium (Na+) and chloride (Cl-) ions at rest, and the movement of these ions across the membrane is limited. Thus, option E "potassium" is the correct answer.

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ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

a) The initial size of the culture was 18 cells. b) There were approximately 44 cells in the culture after 20 minutes. c) There were approximately 158 cells in the culture after 2.5 hours.

a. To solve for N, we need to use the given information that after 2 hours, there were 144 cells. The formula for exponential growth is N = W * e^(rt), where N is the number of cells, W is the initial size of the culture, r is the growth rate, and t is the time in hours. Plugging in the values we have, we get:

144 = W * e^(2r) Dividing both sides by W: 144/W = e^(2r) Taking the natural logarithm of both sides: ln(144/W) = 2r Solving for r: r = ln(144/W) / 2 Now we can plug in W and r to solve for N: N = W * e^(rt) = W * e^(ln(144/W)/2 * 2) N = W * e^ln(144/W) N = 144

Therefore, the initial size of the culture was 18 cells (N = 144/W, W = 144/N = 144/8 = 18).

b. To find the number of cells in the culture after 20 minutes, we need to convert 20 minutes to hours (since the formula uses hours). 20 minutes is 1/3 of an hour. Plugging in this value to the formula, we get:

N = W * e^(rt) = W * e^(1/3 * r) We still don't know the value of r, but we can use the information that the culture grows exponentially to find it. We know that the culture grows from W to N in the time period t (2 hours in part a), so we can set up the equation:

N = W * e^(rt) 144 = 18 * e^(2r) Simplifying: 8 = e^(2r) ln(8) = 2r r = ln(8) / 2 Now we can plug in r and t to find N: N = W * e^(rt) = 18 * e^(1/3 * ln(8)/2) N = 44.33 (rounded to two decimal places)

Therefore, there were approximately 44 cells in the culture after 20 minutes.

c. To find the number of cells in the culture after 2.5 hours, we can plug in the given values into the formula:

N = W * e^(rt) = 18 * e^(2.5r) Using the value of r we found in part b: N = 18 * e^((2.5 * ln(8))/2) N = 158.49 (rounded to two decimal places)

Therefore, there were approximately 158 cells in the culture after 2.5 hours.

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Answer:

cation - electron loss hence positive charge

anion - electron gain hence negative charge

The given terms are correctly paired thus: anion is to electron gain while cation is to electron loss.

Ionic bond formation is defined as the formation of an ionic bond during a chemical reaction whereby an atom losses electrons while another gains electrons through transfer of these electrons.

For example in the formation of the compound NaCl. Sodium is the element that donates an electron from its outermost shell to chloride. Therefore, the sodium atom is the cation.

Also the chloride element would accept electron from the sodium, therefore, it is called the anion.

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To calculate the energy released per mole for the given nuclear fusion reaction, we need to determine the mass defect and use Einstein's mass-energy equation (E = mc²).

First, let's calculate the total mass of the reactants:

Mass of 2 1H = 2.01410 amu

Mass of 3 1H = 3.01605 amu

Total mass of the reactants = 2.01410 amu + 3.01605 amu

Total mass of the reactants = 5.03015 amu

Next, let's calculate the total mass of the products:

Mass of 4 2He = 4.00260 amu

Mass of 1 0n = 1.00866492 amu

Total mass of the products = 4.00260 amu + 1.00866492 amu

Total mass of the products = 5.01126492 amu

Now, let's calculate the mass defect:

Mass defect = Total mass of the reactants - Total mass of the products

Mass defect = 5.03015 amu - 5.01126492 amu

Mass defect = 0.01888508 amu

To convert the mass defect to kilograms, we'll use the conversion factor:

1 amu = 1.66053906660 x 10⁻²⁷ kg

Mass defect in kilograms = 0.01888508 amu x (1.66053906660 x 10⁻²⁷ kg/amu)

Mass defect in kilograms = 3.134 x 10⁻²⁹ kg

Finally, we can calculate the energy released using Einstein's mass-energy equation:

E = mc²

E = (3.134 x 10⁻²⁹ kg) x (299,792,458 m/s)²

E = 2.81 x 10⁻¹³ J

Therefore, the energy released per mole for the nuclear fusion reaction is approximately 2.81 x 10⁻¹³ J.

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Answer:

5.30 is the probability of a no longer exists in a singie than the first half in a video of a different characters are

Answer:

ice water by its temperature it makes you want more to drink. while room temperature feels like you need more and more water to not feel dehydrated

Explanation:

The balanced equations for the following reactions: Liquid water decomposes to yield hydrogen and oxygen gases, is 2 H₂O(l) → 2 H₂(g) + O₂(g). Here two molecules of liquid water (H₂O) decompose to form two molecules of hydrogen gas (H₂) and one molecule of oxygen gas (O2).

In the reaction, two molecules of liquid water (H₂O) decompose. Each water molecule contains two hydrogen atoms (H) and one oxygen atom (O). The goal is to balance the equation by ensuring that the number of atoms of each element is the same on both sides. On the left side of the equation, we have 2 H₂O, which means we have a total of 2 hydrogen atoms and 2 oxygen atoms. On the right side of the equation, we have 2 H₂, which means we have a total of 4 hydrogen atoms, and we also have O₂, representing one molecule of oxygen gas.

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The resulting aqueous solution that makes a buffer when equal volumes of solutions of the given concentrations are mixed together is 0.25 M HCl + 0.2 M NH₃ and 0.1 M HCl + 0.2 M NH₃. So, the correct options are B & E.

A buffer is formed when a weak acid is mixed with its conjugate base or a weak base is mixed with its conjugate acid. In option E, HCl is a strong acid and NH₃ is a weak base. When they react, they form NH₄⁺ (the conjugate acid of NH₃) and Cl-.

A) 0.1 M HCl + 0.2 M CaCl₂: HCl is a strong acid, and CaCl₂ is a salt of a strong base and weak acid. This is not a buffer.

B) 0.1 M HCl + 0.2 M NH₃: HCl is a strong acid, and NH₃ is a weak base. This combination forms a buffer.

C) 0.1 M CH₃COOH + 0.2 M NaOH: CH₃COOH is a weak acid, and NaOH is a strong base. This is not a buffer.

D) 0.1 M CH₃COONa + 0.2 M NaOH: CH₃COONa is a salt of a weak acid and strong base, and NaOH is a strong base. This is not a buffer.

E) 0.25 M HCl + 0.2 M NH₃: HCl is a strong acid, and NH₃ is a weak base. This combination forms a buffer.

So, the correct options are B and E.

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Answer:

Table salt, also known as sodium chloride (NaCl), is a compound. A compound is a substance that is made up of two or more different types of atoms chemically bonded together. Sodium and chlorine are two different elements, but when they react, they form a new substance with its own unique properties, such as the characteristic salty taste of sodium chloride.

In other words, sodium and chlorine do not exist as sodium chloride in their natural state, but only when they chemically combine to form a new substance. Therefore, sodium chloride is a compound, not an element.

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Answer:

In Mendeleev's table, each period contains eight elements, and then the pattern repeats in the next row

Explanation:

this should be it

The solution with the highest vapor pressure will be the one with the lowest boiling point and the most volatile components.

According to Raoult's law, the vapor pressure of a solution is directly proportional to the mole fraction of the solvent. So, in this case, the solution with the lowest amount of solute would have the highest vapor pressure. From the options given, the solution with the lowest concentration of solute is 0.75 m C2H5OH. Ethanol has a lower boiling point and is more volatile compared to the other solutes, thus the solution with 0.75 m C2H5OH is expected to have the highest vapor pressure.
To determine the solution with the highest vapor pressure, we need to consider Raoult's law, which states that the vapor pressure of a solution is directly proportional to the mole fraction of the solvent. In this case, the solution with the lowest molality will have the highest vapor pressure since it has the highest mole fraction of the solvent. Among the given solutions, 0.10 m Al(ClO) has the lowest molality, making it the solution expected to have the highest vapor pressure.

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