Select the part whose main job is to control which substances enter and leave an animal cell.

Answer:

Transition metals, alkali metals, alkaline earth metals Transition metals - Middle of the periodic chart, only average reactivity. alkali metals - As mentioned above, very reactive. Bad choice, going from lower reactivity to higher reactivity.

Hope this answer is right!

Answer:

covalent bond

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Answer:

Covalent bonds are the most important means of bonding in organic chemistry.

Explanation:

Answer:

An element X reacts with oxygen to form XO

and with chlorine to form XCl

. XO

is a white solid that melts at high temperatures (above 1000 degrees C). Under usual conditions, XCl

is a colorless liquid with a boiling point of 58 degrees C.

Explanation:

Answer:

John Dalton

Explanation:

Answer:

Explanation:

Concentration of Hg⁺² = 7.36 x 10⁻⁴ M

Concentration of Al⁺³ = 1.05 M

2Al + 3Hg⁺² = 2Al⁺³ + 3Hg .

E = E₀ + RT / nF ln [ Al⁺³]² / [ Hg⁺² ]³

E₀ = reduction potential of  Hg⁺² minus reduction potential of  Al⁺³

= 0.92 V - ( - 1.66 V )

= 2.58 V

E = 2.58  + .059 /n  log  [ Al⁺³]² / [ Hg⁺² ]³

n = 6 , [Al⁺³] = 1.05 M ; [Hg⁺²] = 7.36 x 10⁻⁴ M

E = 2.58  + .059 /6  log  [ 1.05]² / [ 7.36 x 10⁻⁴ ]³

= 2.58  + .059 /6  log  27.65 x 10⁸ .

= 2.58  + .059 /6  [8+ log  27.65 ].

= 2.58  + .059 /6  [8+ log  27.65 ].

= 2.58  + .09

= 2.67 V .

To determine the temperature of the air inside the tire when the pressure increases to 87.3 kPa, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

Assuming the volume of the tire remains constant, we can rearrange the equation as follows:

P₁/T₁ = P₂/T₂

Where:

P₁ = initial pressure (82.0 kPa)

T₁ = initial temperature (26.0 °C + 273.15 K) [converting Celsius to Kelvin]

P₂ = final pressure (87.3 kPa)

T₂ = final temperature (unknown)

Substituting the values into the equation:

82.0 kPa / (26.0 °C + 273.15 K) = 87.3 kPa / T₂

Now, let's solve for T₂:

T₂ = (87.3 kPa * (26.0 °C + 273.15 K)) / 82.0 kPa

Calculating the expression:

T₂ ≈ 299.19 K

To convert this temperature back to Celsius:

T₂ ≈ 299.19 K - 273.15 ≈ 26.04 °C

Therefore, the temperature of the air inside the tire, when the pressure increases to 87.3 kPa, is approximately 26.04 °C.

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a) There are electrons of parallel spins in the same orbital

b) The electron spins should be converted to antiparallel in the orbital

c) The element belongs to group six.

We know that the orbital diagram is the diagram that can be used to show how electrons are arranged in the orbitals of an element. As such, the segment of the orbital diagram that is shown would have to correspond to a give orbital and preferable part of the outermost orbital configuration of the elements that is in question.

The orbital diagram is incorrect because two electrons in the same orbital can be seen to have parallel spins and this against the postulate of the Pauli exclusion rule. We can correct this making one of the electron to have anti parallel spin.

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The solution of KCl in water will undergo precipitation of KCl crystals as the temperature decreases from 50 °C to 20 °C and then to 34 °C due to the decreasing solubility of KCl in water.

What happens to a solution of KCl in water when cooled from 50 °C to 20 °C and then to 34 °C?

When the solution of KCl in water is cooled from 50 °C to 20 °C, the solubility of KCl in water decreases. As a result, some of the KCl will start to come out of the solution and form solid crystals.

Then, when the temperature of the solution is further decreased from 20 °C to 34 °C, the solubility of KCl in water decreases even further, causing more KCl to come out of the solution and form solid crystals. This is known as precipitation.

The amount of KCl that will come out of the solution depends on the solubility of KCl at the respective temperatures. The solubility of KCl in water is about 34 g/100 mL at 20 °C and about 42 g/100 mL at 34 °C. Therefore, when the solution is cooled from 50 °C to 20 °C, some KCl will come out of solution until the concentration in solution reaches about 34 g/100 mL. Further cooling to 34 °C will cause more KCl to come out of solution until the concentration in solution reaches about 42 g/100 mL.

The exact amount of KCl that will come out of solution can be calculated using thermodynamic models and experimental data on the solubility of KCl in water at different temperatures.

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The strand 1 of hydrocarbons is used to produce plastic, hence option D is correct.

Raw resources like natural gas, oil, or plants that have been processed into ethane and propane are used to make plastics. The subsequent "cracking" procedure uses heat to transform ethane and propane into ethylene and propylene. To produce various polymers, these components are mixed.

Propylene is a substance found in large quantities in petroleum. In order to speed up chemical processes, refiners combine heated propylene with a catalyst to create plastic. Propylene molecules start to cluster together like beads on a thread as a result.

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It is pseudoscience because each metal is known to be a unique element alchemy is a science or pseudoscience.

Matter is anything that occupies space and has mass; in other respects, matter is the "thing" that the cosmos is made of. The fundamental constituents of all stuff are called elements. These are not changed into other elements by conventional chemical processes and have distinct chemical and physical properties.

Matter can be solid, liquid, or gaseous on Earth. Solid particles, fluids, and gases are supported by the exceptionally small building components known as atoms and molecules. A solid's component particles are attracted to one another strongly. They are close to one another and vibrate en position without passing each other.

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The complete question is -

Alchemy is a branch of ancient knowledge that states that all matter is composed of air, fire, earth. Which of these best explains whether alchemy is a science or pseudoscience?

A-It is a science because all matter is known to be made of elements.

B-It is a science because air, fire, earth, and water all are forms of matter.

C-It is pseudoscience because all matter is known to be made of atoms.

D-It is pseudoscience because ancient knowledge is mystical yet reliable.

E-It is pseudoscience because each metal is known to be a unique element.

Answer

6.59 L

Explanation

Given:

Pressure 1 (P1) = 2.5 atm

Pressure 2 (P2) = 8.5 atm

Volume 1 (V1) = 22.4 L

Required: Volume 2 (V2)

Solution:

Step 1: To solve this problem, we will use Boyles Law of gasses

Step 2:

P1V1 = P2V2

V2 = (P1V1)/P2

V2 = (2.5 atm x 22.4 L)/8.5 atm

V2 =

Answer:

major ecological grouping of plants and animals

food chain

*biome*

bacteria and fungi that break down dead matter

*decomposers*

a state of change in which the end result is equal or

balanced

*dynamic equilibrium*

the basic relationships that show how a community of plants,

animals, and bacteria live and grow and how these living

*ecosystem*

things are dependent on each other as well as the Sun, soil,

and other nonliving parts of their environment; a cycle of

relationships

line of plants and animals that shows the order in which

*Food chain*

organisms are eaten

a condition or conditions of the nonliving surroundings, such

*environmental factor*

Explanation:

Answer:

The energy in cabbage leaves comes from the light from the sun.

Explanation:

The plant keeps the light (in the leaves) as energy to help make it grow.

Answer:

CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)

Explanation:

Methane is an hydrocarbon. Whenever hydrocarbon undergoes a reactio with oxygen, the products formed are carbon(iv) oxide and water.

The equation of the reaction is given as;

CH4 + O2 --> CO2 + H2O

Upon balancing the equation, we have;

CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)

The mass of 7.8 x 10^22 carbon atoms is 1.553 grams.

To determine the mass of 7.8 x 10^22 carbon atoms, we need to use the concept of molar mass and Avogadro's number.

The molar mass of carbon (C) is approximately 12.01 g/mol, which represents the mass of one mole of carbon atoms. Avogadro's number states that there are 6.022 x 10^23 atoms in one mole of any substance.

Now, let's calculate the mass of 7.8 x 10^22 carbon atoms:

Determine the number of moles:

Number of moles = Number of atoms / Avogadro's number

Number of moles = (7.8 x 10^22) / (6.022 x 10^23) = 0.1295 moles

Calculate the mass:

Mass = Number of moles x Molar mass

Mass = 0.1295 moles x 12.01 g/mol = 1.553 g

Therefore, the mass of 7.8 x 10^22 carbon atoms is approximately 1.553 grams.

The calculation is based on the understanding that the molar mass of carbon represents the mass of one mole of carbon atoms. By dividing the given number of atoms by Avogadro's number, we obtain the number of moles. Multiplying the number of moles by the molar mass gives us the mass in grams.

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Answer:

decreases by 10 gram

Explanation:

The density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams is 3.4 g/cm³ (1st option)

First, we shall obtain the volume of the metal. Details below:

Volume = L³

Volume = 5.08³

Volume = 131.1 cm³

Finally, we shall obtain the density of the metal. Details below:

Density = mass / volume

Density of metal = 444.5 / 131.1

Density of metal = 3.4 g/cm³

Thus, we can conclude from the above calculation that the density of the metal is 3.4 g/cm³ (1st option)

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Complete question:

What is the density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams?

3.4 g/cm³

8.89 g/cm³

55.56 g/cm³

0.180 g/cm³

The mass of the carbon dioxide is  49.72 g from the calculation done.

The phrase "mole fraction," which is often referred to as "molar fraction" or "amount fraction," is used to describe the proportions of a mixture's components. It is an intangible quantity that expresses the proportion between the moles of a given component and the total moles in the combination.

We know that;

Number of moles of ethanol = 9.2/46 g/mol

= 0.2 moles

Now;

Number of moles of water = 216.0 g/18 g/mol

= 12 moles

Mole fraction of water = Number of water/ Total number of moles

0.9 = 12/12 + 0.2 + x

0.9(12.2 + x) = 12

10.98 + 0.9x = 12

x = 1.13 moles

Now;

Moles = mass/Molar mass

1.13 = x/44

x = 49.72 g

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According to the Foliated Metamorphic Rock Chart slate, phyllite, schist, and gneiss can all have the same parent rock (shale) is a true statement.

Slate, phyllite, schist, and gneiss are all types of metamorphic rocks that can be formed from shale, which is a sedimentary rock composed of clay and other fine-grained minerals. The specific type of metamorphic rock that is formed from shale depends on the conditions under which the shale undergoes metamorphism, including the temperature, pressure, and presence of fluids.

Slate is a fine-grained metamorphic rock with a uniform, flat surface and a layered structure. It is formed when shale undergoes low-grade metamorphism, which occurs at relatively low temperatures and pressures.

Therefore, Gneiss, on the other hand, is a medium- to coarse-grained metamorphic rock with a banded or wavy texture. It is formed when shale undergoes high-grade metamorphism, which occurs at higher temperatures and pressures.

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Answer:nate should take away two markers from him

Explanation:

Answer:

2

Explanation:

they would take two away from him

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.

Answer: 204.8256 millimeters

Explanation:

The average atomic mass of magnesium is 24.305 amu.

The mass of a single atom is too small to be measured directly, but chemists and physicists use the atomic mass unit (amu) to describe the mass of an atom.

The atomic mass unit is defined as 1/12th of the mass of a carbon-12 atom. Magnesium (Mg) has three isotopes: Mg-24, Mg-25, and Mg-26, with masses of 23.985 amu, 24.986 amu, and 25.983 amu, respectively.

These isotopes make up 78.99%, 10.00%, and 11.01%, respectively, of all naturally occurring Mg atoms.

The atomic mass of Mg can be calculated using the weighted average of the three isotopes as follows:Average atomic mass = (78.99/100 x 23.985 amu) + (10.00/100 x 24.986 amu) + (11.01/100 x 25.983 amu)Average atomic mass = 23.940 amu + 2.499 amu + 2.864 amuAverage atomic mass = 29.303 amu.

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Answer:

Explanation:

1,2,4,

The equations that show combustion are equations A, B and D.

When we talk about combustion, the idea is that the substance would be burnt in oxygen. In other words, the combustion can be taken to be an oxidation reaction. It is an oxidation reaction in the sense that the oxidation number of the substance that is reacting with the oxygen would become increased.

When we look at the equations that we have, it is quite easy to pick out among the balanced reaction equations that are shown here the ones that has to do with the burning of the substance in oxygen and a consequent rise in the oxidation number.

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2.26 × 10²⁴ atoms Zn

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

3.75 mol Zn (Zinc)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

2.25825 × 10²⁴ atoms Zn ≈ 2.26 × 10²⁴ atoms Zn

The model would be complete when there two pairs of white dots and one pair of black dots

The chemical process of electrolysis breaks down water molecules into their component parts, hydrogen  and oxygen , using an electric current. Two simultaneous reactions take place at distinct electrodes, referred to as the anode and cathode, which are submerged in an electrolyte solution, to produce this process.

A crucial step in the process of creating hydrogen gas, a clean and renewable energy source, is the electrolysis of water.

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Answer:

1. Equilibrium expressions:

a. K = [HSO4-][H3O+]/[H2SO4][H2O]

b. K = [NO]^4[H2O]^6/[NH3]^4[O2]^5

c. K = [NH3][HCl]/[NH4Cl]

d. K = [NO2]^2/[N2O4]

2. Since K = 0.050, the concentrations of the reactants (N2 and H2) are larger than the concentrations of the products (NH3).

3. Since K = 6.8 x 10^3, the concentrations of the products (SO2 and O2) are larger than the concentrations of the reactant (SO3).

4. The Ksp expression for each of the reactions is:

a. Ksp = [Na+][Cl-]

b. Ksp = [Ba2+][SO42-]

5. Brønsted-Lowry acids and bases:

a. Acid: HNO3; Conjugate base: NO3-; Base: H2O; Conjugate acid: H3O+

b. Acid: HCN; Conjugate base: CN-; Base: H2O; Conjugate acid: HCN

c. Acid: H2SO4; Conjugate base: HSO4-; Base: Cl-; Conjugate acid: HCl

d. Acid: NH3; Conjugate base: NH2-; Base: H2O; Conjugate acid: NH4+

e. Acid: H2O; Conjugate base: OH-; Base: O2-; Conjugate acid: OH-

6. Conjugate acids and bases:

a. Acid: H2O; Conjugate base: OH-

b. Acid: H3O+; Conjugate base: H2O

c. Acid: H2CO3; Conjugate base: HCO3-

d. Acid: NH4+; Conjugate base: NH3

e. Acid: HSO4-; Conjugate base: SO42-

7. The strongest acid is HIO4 (highest K value), followed by HCN, HC2H3O2, and H2CO3 (lowest K value). The K values represent the degree to which the acids dissociate in solution. HIO4 is a strong acid, meaning it dissociates almost completely in solution, while H2CO3 is a weak acid, meaning it only dissociates partially.

8. pH and pOH calculations:

a. pH = -log[H3O+] = -log(0.200) = 0.699; pOH = -log[OH-] = -log(1.0 x 10^-14/0.200) = 12.301

b. pOH = -log[OH-] = -log(0.0143) = 1.844; pH = 14.000 - pOH = 12.156

c. pH = -log[H3O+] = -log(3.0) = 0.522; pOH = 13.478

d. pOH = -log[OH-] = -log(0.0062) = 2.206; pH = 14.000 - pOH = 11.794

9. Hydronium and hydroxide ion concentrations:

pH = 3.6; hydronium ion concentration = 10^-pH = 3.98 x 10^-4 M; hydro

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Answer:

Explanation:

Gravity pulls the balls down the ramp, and the force of gravity is bigger on larger-mass objects. The extra force on the bigger ball means that it has more energy when it gets to the bottom of the ramp and consequently travels more before stopping.

The property X is an extrinsic property.

The term extensive property refers to the type of property that depends on the amount of the substance present. We must recall that an intensive property does not in any way depend on the number or the amount of the substance present in the sample.

If we have a good look at the table that is being referred to here, we would see that the mass of the substance tends to increase as a certain un named property of the substance X is increasing. This implies that the property X is affected by the mass of the object which is the quantity of matter in the object. This gives us an idea that the property that we are referring to can not be an intrinsic  property since it varies with the mass of the substance that is under study as shown.

We can then conclude that the property X is an extrinsic property.

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Missing parts;

Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table. Which of the following best describes property X?

A. X  is an intensive property because it does not vary with the size of the sample.

B. X is an extensive property because it does not vary with the size of the sample.

C. X is an extensive property because it varies directly with the size of the sample.

D. X is an intensive property because it varies directly with the size of the sample.