Select all of the objects that (essentially) maintain a constant velocity.
A planet in orbit around a star
A hockey puck sliding on the ice
An apple sitting on a table
A baseball after being hit by a bat

Answer:

the solution is acidic as its ph has already exceeded the neutral level

\(1.1 X 10^-9 M\) is the [H] in a solution with a pH of 9.92.

pH is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

The pH of a solution is usually found by the following expression:

pH=-log [\(H^+\)]

Therefore, to find the concentration of \(H^+\) we can rearrange this expression and thus,

= [\(H^+\)] = \(10^-^{pH}\)

= [\(H^+\)] = \(10^-^{9.92}\)

=\(1.1 X 10^-9 M\)

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Answer:

respritory and circulatory systems

lungs and heart

Explanation:

Answer:

11.5 okkkkkkkkkkkkkkkkkkkkkkkkkkkk chutita

The indirect result of contaminants from commercial farming is algae.

Contaminant is a substance either chemical, physical that is very toxic or harmful to living organisms, when it is released into air, water, soil or food.

Contaminant are poisionus substance that are not deliberately or are deliberately introduced to space . This contaminants make things impure and they are highly poisionus.

Therefore, The indirect result of contaminants from commercial farming is algae.

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Answer:

The atomic combinations can be matched to the appropriate functional groups as follows:

- A. C-O-C: C. Ester

- B. O=C-O-H: B. Carboxylic acid

- C. O=C-O-C: C. Ester

- D. C-O-H: A. Alcohol

Explanation:

From the balanced chemical equation:

3 FeCl2 + 2 Na3PO4 → Fe3(PO4)2 + 6 NaCl

We can see that the stoichiometric ratio between FeCl2 and NaCl is 3:6, or simplified, 1:2. This means that for every 1 mole of FeCl2 reacted, 2 moles of NaCl are produced.

Given that 7.23 moles of FeCl2 react, we can use the stoichiometric ratio to determine the moles of NaCl produced:

Moles of NaCl = 2 * moles of FeCl2

Moles of NaCl = 2 * 7.23 moles

Moles of NaCl = 14.46 moles

Therefore, 14.46 moles of sodium chloride are produced when 7.23 moles of iron (II) chloride reacts with excess sodium phosphate.

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The pH of a solution can be calculated from the concentration of hydroxide ions using the formula pH = -log[H+]. In this case, the pH of the solution with an [OH-] concentration of 3.94e⁻⁵ M is approximately 9.6.

The concentration of hydroxide ions [OH-] in the solution is 3.94e⁻⁵ M.

The pH of a solution can be calculated using the formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution. To find [H+], we can use the fact that in any aqueous solution at room temperature,

[H+][OH-] = 1.0 × 10⁻¹⁴

Rearranging this equation to solve for [H+], we get:

[H+] = 1.0 × 10⁻¹⁴ / [OH-]

Substituting the given value for [OH-], we get:

[H+] = 1.0 × 10⁻¹⁴ / 3.94e⁻⁵

[H+] = 2.54 × 10⁻¹⁰ M

Now we can use this value to calculate the pH:

pH = -log[H+]

pH = -log(2.54 × 10⁻¹⁰)

pH = 9.595

Therefore, the pH of the solution is approximately 9.6.

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Answer:

D. ocean ridges​

Explanation:

Answer:

I think A

Explanation:

Most volcanoes form at the boundaries of Earth's tectonic plates. ... The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries

The uncertainty principle is an essential principle of quantum mechanics. The uncertainty principle states that you can never know the exact position and velocity of a particle at the same time.

Instead, there will always be some uncertainty. The Heisenberg uncertainty principle is a physical principle that describes how the position and velocity of a particle cannot be measured at the same time. It is impossible to determine both quantities simultaneously. The uncertainty principle provides a limit on how precisely the position and momentum of a particle can be known at the same time.

According to the Heisenberg uncertainty principle, ΔxΔp≥ℏ2

WhereΔx is the uncertainty in position,Δp is the uncertainty in momentum, andℏis Planck's constant.Δx=(ℏ/2Δp)=1.055 × 10⁻³⁴ m

Therefore, the uncertainty in position is Δx = 1.055 × 10⁻³⁴ m.

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The factor identified as not associated with (and possibly causing) type 1 diabetes mellitus is option c) dysfunctional insulin receptors.

Insulin-producing cells in the pancreas are destroyed in type 1 diabetes mellitus, an autoimmune condition. Type 1 diabetes mellitus is thought to be caused by or be influenced by the following factors:

A hormone called insulin is produced by beta cells in the pancreas. It is essential for controlling blood sugar levels and making it easier for cells to absorb glucose for use as fuel. Insulin signals cells in the liver, muscle, and fat tissues to absorb glucose from the bloodstream, assisting in the maintenance of normal blood sugar levels.

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The peptide bond between which two amino acid residues is cleaved by HIV protease will be "Phenylalanine Proline".

Whenever the carboxyl group with one molecule combines at all with  the amino group of the other molecule, a molecule of water is released, and a peptide bond is created among the two molecules (\(H_{2} O\))

The HIV protease breaks down large precursor proteins towards smaller ones. A new HIV virus is created when these smaller proteins interact with both the genetic material of HIV. HIV cannot replicate when protease is blocked by protease inhibitors (PIs).

HIV protease breaks down freshly created polyproteins specifically, Gag as well as Gag-Pol at nine cleavage sites to produce the mature protein components of such an HIV virion, the infectious version of the virus beyond the host cell. HIV virions do not spread disease in the absence of an efficient HIV protease.

Therefore, the peptide bond between which two amino acid residues is cleaved by HIV protease will be "Phenylalanine Proline".

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The rate of the reaction, 2A+B→C, with zeroth order in A and zeroth order in B, and a rate constant of \(k=0.0739 Ms^{−1} , is 0.0739 Ms^{−1}\).

The rate of the reaction can be determined using the rate law equation and the given concentrations of A and B.

The rate law equation for the given reaction is rate =\(k[A]^x[B]^y\), where [A] and [B] represent the concentrations of A and B, respectively, and k is the rate constant.

In this case, the rate law is zeroth order in A and zeroth order in B, which means that the concentrations of A and B do not affect the rate of the reaction. Therefore, x and y in the rate law equation are both zero.

To calculate the rate, substitute the values into the rate law equation:
rate = \(k[A]^x[B]^y\)
    = \(k[0.20M]^0[0.15M]^0\)
    = k

Given that the rate constant k is 0.0739 \(Ms^{-1}\), the rate of the reaction is also 0.0739\(Ms^{−1}\).

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Answer:

D. an orbital notation of the atom

Explanation:

Orbital notiation uses lines and arrows to show shells, subshells, and orbitals for electrons in an atom. Since it shows arrows being paired up in this diagram it would be the best model for Chuck to use.

Answer:

7.88g/mL is density of iron

Explanation:

As water and iron are insoluble, the volume of displaced fluid (Water) is equal to the volume of the solid (Iron). That means volume of the iron is:

24.19mL - 23.20mL = 0.99mL is the volume of iron

As density is the ratio between mass -7.8g- and volume of a compound -0.99mL- the density of iron is:

7.8g / 0.99mL =

Answer: During a phase change, such as melting or boiling, the kinetic energy increases.

Explanation:

Kinetic energy is the energy obtained by the molecules of a substance due to their motion.

When phase change such as melting or boiling takes place then it means heat is absorbed by the substance. As a result, their molecules more even more rapidly from one place to another due to which more number of collisions take place.

Hence, a change in phase of substance occurs as kinetic energy increases in melting or boiling process.

Thus, we can conclude that during a phase change, such as melting or boiling, the kinetic energy increases.

In aqueous solutions, hydrogen bonds have similar bond strength as ionic bond interactions. Thus option B is the answer.

In aqueous solutions, ionic interactions occur between positively and negatively charged ions, which are held together by electrostatic forces. These forces are relatively strong and are responsible for the high melting and boiling points of ionic compounds. Hydrogen bonds, on the other hand, are a type of dipole-dipole interaction between the partially positive hydrogen atom of one molecule and the partially negative atom of another.

The strength of hydrogen bonds is about 5-10% of the strength of covalent bonds, which is similar to the strength of ionic bonds in aqueous solutions. This makes hydrogen bonds the type of bond or force that has similar bond strength as ionic bond interactions in aqueous solutions. These type of bonds are found in many biomolecules like DNA and RNA, proteins and many other natural and synthetic compounds.

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Answer: If a pinch of mercury is consumed you will die from it so using a mercury thermometer is very unsafe if its breaks and a child consumes that mercury.

Explanation:

Don't use one

If the glass breaks and the mercury is not properly cleaned up, the little silvery ball within a mercury thermometer might be hazardous. As the mercury evaporates, it may pollute the air around and turn dangerous to both people and animals.

Children that have been exposed to mercury have lower IQs, hearing impairments, and worse coordination.

Long-term exposure worsens and exacerbates symptoms, which may lead to personality changes or even coma.

Mercury thermometers can be replaced by a number of things:

These non-mercury fever thermometers are significantly safer and equally accurate as mercury thermometers.

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The period between cell divisions is called interphase. The correct answer A.

Interphase is the period of the cell cycle that prepares the cell for division. It is comprised of three main stages:

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Answer: The molecules will move more quickly.

Explanation:

As temperature increases, the kinetic energy of the particles increases, causing them to move more quickly.

Taking into account the reaction stoichiometry and ideal gas law, the mass of NaCl that reacted with F₂ at 280 K, 15 L and 1.50 atm is 114.56 grams; and if you have the same volume of fluorine gas at STP, the mass of NaCl reacted is 78.323 grams.

In first place, the balanced reaction is:

F₂ + 2 NaCl  → Cl₂ + 2 NaF

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:

P×V = n×R×T

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

You know for F₂:

Replacing in the definition of ideal gas law:

1.50 atm× 15 L = n× 0.082 (atm×L)÷(mol×K)× 280 K

Solving:

(1.50 atm× 15 L)÷ (0.082 (atm×L)÷(mol×K)× 280 K)= n

0.979965 moles= n

Then the following rule of three can be applied: if by stoichiometry of the reaction 1 mole of F₂ reacts with 116.9 grams of NaCl, 0.979965 moles of F₂ reacts with how much mass of NaCl?

mass of NaCl= (0.979965 moles of F₂× 116.9 grams of NaCl)÷ 1 mole of F₂

mass of NaCl= 114.56 grams

Finally, the mass of NaCl reacted is 114.56 grams.

In this case, you have the same volume of fluorine gas at STP:

Replacing in the definition of ideal gas law:

1 atm× 15 L = n× 0.082 (atm×L)÷(mol×K)× 273 K

Solving:

(1 atm× 15 L)÷ (0.082 (atm×L)÷(mol×K)× 273 K)= n

0.67 moles= n

Then the following rule of three can be applied: if by stoichiometry of the reaction 1 mole of F₂ reacts with 116.9 grams of NaCl, 0.67 moles of F₂ reacts with how much mass of NaCl?

mass of NaCl= (0.67 moles of F₂× 116.9 grams of NaCl)÷ 1 mole of F₂

mass of NaCl= 78.323 grams

Finally, the mass of NaCl reacted is 78.323 grams.

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The likely empirical formulas among the given options are

b. PCl3 and d. C2H6O.

An empirical formula represents the simplest whole-number ratio of atoms in a compound. By analyzing the given formulas, we can determine which ones fulfill this criterion.

PCl3 consists of one phosphorus atom and three chlorine atoms, indicating a 1:3 ratio. This ratio cannot be simplified further, making it an empirical formula. C2H6O represents two carbon atoms, six hydrogen atoms, and one oxygen atom. Dividing all the subscripts by the greatest common divisor (2), we get the simplified ratio of 1:3:0.5. However, since we cannot have half an atom, we multiply all the subscripts by 2, resulting in the empirical formula C2H6O.

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To calculate the maximum mass of zinc that will react with 50 cm3 of hydrochloric acid with a concentration of 2.0 mold/dm3, we first need to use the balanced chemical equation for the reaction between zinc and hydrochloric acid:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
From this equation, we can see that one mole of zinc reacts with 2 moles of hydrochloric acid. Therefore, the number of moles of hydrochloric acid in 50 cm3 (0.05 dm3) with a concentration of 2.0 mold/dm3 is:
n(HCl) = C × V = 2.0 × 0.05 = 0.1 mol
Since the stoichiometry of the reaction is 1:2 (1 mole of zinc reacts with 2 moles of hydrochloric acid), the maximum number of moles of zinc that can react is:
n(Zn) = 0.1/2 = 0.05 mol
Finally, we can use the molar mass of zinc (65.38 g/mol) to calculate the maximum mass of zinc that can react:
mass(Zn) = n(Zn) × M(Zn) = 0.05 × 65.38 = 3.27 g
Therefore, the maximum mass of zinc that will react with 50 cm3 of 2.0 mold/dm3 hydrochloric acid is 3.27 grams.

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Answer:

Why has my town experienced record-breaking cold and snowfall if the climate is warming? Is there scientific consensus that people are causing today's climate change? Do natural variations in climate contribute to today's climate change?

Explanation:

Yan po ang answer tama po yan

Answer:

0.2 moles de SO₂

Explanation:

La reaccción es:

2H₂S (g) +  3O₂ (g)  →  2SO₂ (g)  +  2H₂O(g)

Asumimos que tenemos 0.250 moles de sulfuro y 0.3 moles de oxígeno.

En primer lugar tenemos que averiguar el reactivo limitante.

Si 2 moles de sulfuro de hidrógeno reaccionan con 3 moles de oxígeno, según la reacción.

Entonces 0.250 moles, reaccionarían con (0.250 . 3) /2 = 0.375moles

Tenemos entonces 0.3 moles de oxígeno y necesitamos 0.375 (no nos alcanza). Por lo tanto el O₂ es el limitante y ahora podemos calcular el producto formado. La ecuación nos dice:

3 moles de oxígeno pueden producir dos moles de SO₂

Entonces 0.3 moles (que son los que tenemos) de O₂ producirían:

(0.3 . 2) /3 = 0.2 moles de SO₂

The solubility product constant expression for AgI is:

AgI(s) ⇌ Ag⁺(aq) + I⁻(aq)

The Ksp expression for AgI is given as 1.47 x 10⁻¹⁶.

Since AgI dissociates into 1 Ag⁺ ion and 1 I⁻ ion, the molar solubility (s) of AgI is equal to the concentration of Ag⁺ and I⁻ ions in the solution.

Let's assume the molar solubility of AgI is s M.

Since the molar solubility (s) of AgI is equal to the concentration of Ag⁺ and I⁻ ions, we have:

[Ag⁺] = s M

[I⁻] = s M

Using the stoichiometry of the balanced equation, the expression for the solubility product constant is:

Ksp = [Ag⁺][I⁻] = s^2

Substituting the given Ksp value, we have:

1.47 x 10⁻¹⁶ = (s)^2

Taking the square root of both sides, we get:

s = √(1.47 x 10⁻¹⁶)

Calculating the square root, we find:

s ≈ 3.83 x 10⁻⁹ M

Since the solubility is given in grams per milliliter (g/mL), we need to convert the molar solubility to grams per milliliter using the molar mass of AgI.

The molar mass of AgI is:

Ag: 107.87 g/mol

I: 126.90 g/mol

AgI: 107.87 g/mol + 126.90 g/mol = 234.77 g/mol

To convert the molar solubility (s) to grams per milliliter (g/mL):

s (g/mL) = (molar solubility (M) * molar mass of AgI (g/mol)) / 1000

Substituting the values, we have:

s (g/mL) = (3.83 x 10⁻⁹ M * 234.77 g/mol) / 1000

Calculating the value, we find:

s (g/mL) ≈ 9.0 x 10⁻¹² g/mL

Therefore, the solubility of silver iodide (AgI) in grams per milliliter (g/mL) at the given temperature is approximately 9.0 x 10⁻¹² g/mL.

The solubility of silver iodide (AgI) in grams per milliliter can be calculated using the concept of solubility product constant (Kₛₚ). Given that the Kₛₚ of AgI is 1.47 x 10⁻¹⁶.

The solubility product constant (Kₛₚ) is a measure of the equilibrium between a solid and its dissolved ions in a saturated solution. For silver iodide (AgI), the equilibrium equation can be expressed as:

AgI(s) ⇌ Ag⁺(aq) + I⁻(aq)

The Kₛₚ expression for this equilibrium is:

Kₛₚ = [Ag⁺][I⁻]

Given the Kₛₚ value of AgI as 1.47 x 10⁻¹⁶, it indicates that the product of the concentrations of Ag⁺ and I⁻ ions in the saturated solution is equal to 1.47 x 10⁻¹⁶.

To determine the solubility of AgI in grams per milliliter, we need to know the molar mass of AgI and the volume of the saturated solution. The molar mass of AgI is 234.77 g/mol, which is the sum of the atomic masses of silver (Ag) and iodine (I).

To convert the concentration of Ag⁺ or I⁻ ions to grams per milliliter, we need to divide the concentration (in moles per liter) by the molar mass (in grams per mole) and multiply by the solution volume (in milliliters).

However, without the given volume of the saturated solution, it is not possible to calculate the solubility in grams per milliliter directly using the Kₛₚ value. The solubility information typically depends on both temperature and the presence of other ions or substances in the solution. Therefore, additional data or an experimental approach would be needed to determine the solubility of AgI in grams per milliliter at the given temperature.

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The pH value of the apple juice is 3.5 and The pH value of ammonia is: 8.5.

pH can be calculated using the following equation

pH = -log [H₃O⁺]

for apple juice the hydronium /hydrogen ion concentration is 0.0003

pH = -log (0.0003)

pH = 3.5

The pH value of the apple juice is 3.5

For ammonia

pH = -log (3.1 x 10⁻⁹)

pH = 8.5

The pH value of ammonia is: 8.5

NB: Not available in the option.

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False. The statement that the species BF3 does not exist because its central boron (B) atom has only 6 valence electrons .

The existence and stability of chemical species are determined by the electron configuration and bonding of the atoms involved. In the case of BF3 (boron trifluoride), boron is the central atom.

Boron, located in Group 13 of the periodic table, has an atomic number of 5. As a result, it has 5 electrons in its neutral state. However, when boron forms chemical compounds, it can utilize vacant orbitals to accommodate additional electrons.

In the case of BF3, boron forms three covalent bonds with three fluorine (F) atoms, resulting in a total of 8 electrons around the boron atom. This satisfies the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with 8 valence electrons.

Therefore, BF3 does exist, and its central boron atom accommodates 8 valence electrons, rather than just 6.

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