Cells have a ______ ___________, a thin layer that controls what goes in and out of the cell.

Answer:

D. 1,950 g

Explanation:

I completed the test and it is the correct answer!

The mass of one mole of gallium iodide GaI₃ is 449.7 g/mol. Hence, the mass of 4.32 moles of GaI₃ is 1950 g.

Gallium iodide is a covalent compound formed by the electron sharing between Ga and three iodine atoms. Ga has three valence electrons and each is shared with three iodine and each iodine in turn shares 3 electrons to Ga.

Atomic mass of Ga = 69 g/mol

Atomic mass of I = 126.9 g/mol

mass of 3 iodine atoms  = 3 ×  126.9 = 380.7 g

Molar mass of GaI₃ = 380.7 + 69 = 449.7 g.

Molar mass of a compound is the mass of one mole of the compound. Hence, one mole of the compound is 449.7 g. Mass of 4.32 moles is :

4.32 × 449.7 ≅1950 g.

Therefore, the mass of 4.32 moles of  GaI₃ is approximately 1950 g.

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Answer:

Q = -627.6 J

Explanation:

Mass, m = 15 grams

Initial temperature, \(T_i=40^{\circ} C\)

Final temperature, \(T_f=30^{\circ} C\)

We need to find the amount of heat released by this much of sample of water. We know that heat released is given by the below formula :

\(Q=mc\Delta T\)

c is specific heat of water, \(c=4.184\ J/g-K\)

\(\Delta T=T_f-T_i\\\\=(30^{\circ}-40^{\circ} )\ C\\\\=-10^{\circ} C\\\\=-10\ K\)

So,

\(Q=15\times 4.184\times -10\\\\Q=-627.6\ J\)

Hence, 627.6 J of heat is released and negative sign shows that energy is being given off.

The correct answer is C) Assertion is correct, but Reason is incorrect.

The statement in the Assertion is correct: The resistance of a bulb is inversely proportional to its rated power. In general, a higher wattage bulb will have a lower resistance compared to a lower wattage bulb.

However, the Reason provided is incorrect. It states that the resistance of a 50W bulb is greater than that of a 100W bulb, which is not true based on the relationship between resistance and rated power.

According to the relationship mentioned, the resistance of a 100W bulb would be lower compared to a 50W bulb.

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If 0.274 moles of a substance weighs 62.5 g, then the molar mass of the substance is 2.28 × 10² g/mol. Hence, option A is correct.

Generally, molecular mass of an element is defined as the sum of the masses of the elements which are present in the molecule. Molecular mass is basically obtained by multiplying the atomic mass of an element with the number of atoms in the molecule and then adding the masses of all the elements in the molecule.

Mass of substance = 62.5 g

Number of moles of substance = 0.274 moles

From the formula,

Number of moles = Given mass / Molar mass

⇒ Molar mass = Given mass / Number of moles

Substituting the values we get,

Molar mass = 62.5 g / 0.274 g =  2.28 × 10² g/mol

Hence, option A is correct.

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Answer:

a cell or battery

Explanation:

this is because a voltaic cell is such a cell where chemical energy gets converted to electrical energy. the energy conversion in the case of an electrolytic cell is from electric to chemical (battery supplies electrons to the anode respectively). So, I feel by adding a cell or battery, we can change the way energy conversion takes place, thereby changing the process.

Answer:

false i am pretty sure because dead flowers.

Answer:

The cause of periodicity in properties is the repetition of similar outer electronic configuration after certain regular intervals. For example, all the elements of group 1 i.e. alkali metals have a similar outer electronic configuration, ns1.

In the provided activity, you are observing the effects of different solutions on the shape of red blood cells. Let's go through each effect and explanation:

Effect of isotonic solution on cell shape:

When an isotonic solution, such as 0.9% NaCl or 5% dextrose, is added to the edge of the coverslip, the red blood cells will not change their shape significantly. An isotonic solution has the same osmolality as the cell, meaning the concentration of solutes in the solution is similar to that inside the cell. As a result, there is no net movement of water across the cell membrane, and the cells maintain their original shape.

Effect of hypertonic solution on cell shape:

When a hypertonic solution, such as 25% NaCl, is added to the edge of the coverslip, the red blood cells will undergo a change in shape. A hypertonic solution has a higher osmolality than the cell, meaning the concentration of solutes in the solution is higher than that inside the cell. In this case, water will move out of the red blood cells through osmosis, from an area of lower osmolality (inside the cells) to an area of higher osmolality (the hypertonic solution). The loss of water causes the cells to shrink and become crenated or wrinkled.

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Answer:

hey there

Density;

The amount of mass or particles per unit of space.

for example, the density of water is 997 kg/m³

Volume;

the amount of space something takes up.

For example Mars is 163 billion cubic kilometers^3

Answer:

1×10^-14 mol^2dm^-6

Explanation:

Ionic product is defined as the product of the concentrations of ions, each raised to the power specified by its stoichiometric coefficient in a solution. The product of concentrations of H+ and OH- ions in water at a particular temperature is known as ionic product of water. The value of Kw increases with the increase of temperature, i.e., the concentration of H+ and OH- ions increases with increase in temperature. The value of Kw at 25°C is 1 x 10-14.

At any given time, the amount of hydrogen ions and hydroxide ions present in water is extremely small and consequently the concentration of undissociated water molecules is almost unchanged by any minute ionization thus it is considered a constant. The product of the concentration of both hydrogen and hydroxide ions is a constant referred to as the ionic product for water.

Answer: B

Explanation:

Answer:

A. -10

Explanation:

The ideal gas law, which relates the pressure, volume, temperature, and number of moles of an ideal gas, can be applied to real-world situations. By considering a specific scenario and applying the ideal gas law, we can analyze the behavior of gases and make predictions about their properties.

Let's consider a situation where a scuba diver is exploring underwater at a depth of 30 meters. We can apply the ideal gas law, specifically the form known as Boyle's law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.

Question: How does the pressure of the gas in the scuba tank change as the diver descends to a depth of 30 meters, assuming the temperature remains constant?

To answer this question, we can use the ideal gas law equation PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature. By keeping the temperature constant, we can observe the relationship between pressure and volume as the diver descends and calculate the change in pressure based on the change in volume.

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The alkane with the molecular formula C₅H₁₂ , which forms the only one monochlorinated product when it is heated with Cl₂ is 2,2 dimethyl propane or neo-pentane.

The alkane with the molecular formula C₅H₁₂, forms only one monochlorination product is given as follows :

C(CH₃)₃- CH₃   + Cl₂  ----->    C(CH₃)₃- CH₂ - Cl

 2,2 dimethyl propane      2,2 dimethyl 1 chloro- propane

      ( neopentane)

thus, the 2,2 dimethyl 1 chloro- propane is formed when the neopentane or the  2,2 dimethyl propane with undergoes mono chlorination. in the mono chlorination the , in the alkane the one hydrogen atom is replaced by the chlorine atom,. this is the process of chlorination.

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Answer:

3

Explanation:

the product of the equation includes 6H....so because there are already 2 hydrogens in the reactants, if you have three of those, or 3*2=6....therefore the coefficient should be 3

Compounds can be categorized as exhibiting either ionic bonding or covalent bonding. Ionic bonding occurs when there is a transfer of electrons from one atom to another, resulting in ions with opposite charges being attracted to each other and forming a bond.

In contrast, covalent bonding occurs when atoms share electrons to fill their outermost electron shells and form a stable molecule. To determine whether a compound exhibits ionic or covalent bonding, one can consider the electronegativity difference between the atoms involved in the bond. If the electronegativity difference is large greater than 1.7, the bond is considered ionic.

If the electronegativity difference is small less than 1.7, the bond is considered covalent. For example, NaCl sodium chloride exhibits ionic bonding because the electronegativity difference between sodium and chlorine is 2.1, which is greater than 1.7. In contrast, H2O (water) exhibits covalent bonding because the electronegativity difference between hydrogen and oxygen is 1.4, which is less than 1.7.

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Answer:

34.81 ×10²³ atoms

Explanation:

Given data:

Mass of water = 52.0 g

Number of atoms of hydrogen = ?

Solution:

Number of moles of water:

Number of moles = mass/molar mass

Number of moles = 52.0 g/ 18 g/mol

Number of moles = 2.89 mol

1 mole of water contain 2 mole of hydrogen.

2.89 mole of water contain 2.89× 2= 5.78 moles of hydrogen.

Number of atoms of hydrogen:

1 mole = 6.022×10²³ atoms

5.78 mol ×  6.022×10²³ atoms / 1mol

34.81 ×10²³ atoms

Answer:

(C3H8 )

Explanation:

Alkanes have the general formula of CnH2n+2 where n is the number of carbon atoms

Answer:

I am expecting that is option is d is correct answer

Explanation:

because in the grassland some animals can live

Answer:

It won't work as well. You can try though, it won't hurt anything

Answer:39+30

Explanation:

Measurements of fossilized tree rings from the Cretaceous period is a paleoclimate proxy. -database of satellite temperature data,

An animal or plant from a previous geologic era that has been preserved in the Earth's crust as a fossil, remnant, impression, or trace. The main repository for knowledge regarding the evolution of life on Earth is the complex of information preserved in fossils found all across the world.

fossils of dinosaurs discovered in Alberta, Canada. Only a small percentage of extinct species have been preserved as fossils, and often only those with a sturdy skeleton are capable of doing so. A calcareous skeleton or shell is present in the majority of major groups of invertebrate creatures (e.g., corals, mollusks, brachiopods, bryozoans). Other types have silicon dioxide or calcium phosphate shells (both of which are found in the bones of vertebrates).

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When the engine's operating speed increases the temperature of the engine will also increase.

Given:

Automobile engines without a cooling system.

To find:

The affect on the temperature of the engine as its operating speed increases.

Solution:

The speed of the operating engine increases.

Velocity of object ∝ Kinetic energy of object...[i]

Kinetic energy  ∝ Temperature of object...[ii]

From [i] and [ii] :

Velocity of object ∝  Temperature of an object

So, from this, we can conclude when the engine's operating speed increases the temperature of the engine will also increase.

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The number of molecules in 9.4 moles of ibuprofen is equal to  5.66 × 10²⁴.

A mole of a substance can be described as an international standard unit that is used to calculate a given count of any particles. The particles that are counted in the unit of the mole are as chemically identical entities, individually distinct.

A mole can be used to calculate atoms, molecules, ions, or other particular particles. The 6.023 × 10 ²³ number of units present in one mole is known as Avogadro’s constant.

Given, the number of moles of ibuprofen = 9.4 mol

The number of molecules of ibuprofen in one mole = 6.023 × 10²³

The number of molecules of ibuprofen in 9.4 moles = 6.023 × 10²³ ×9.4

Number of molcules of ibuprofen = 5.66 × 10²⁴ molecules

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Table salt (NaCl) is a compound. Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as fixed composition.

Hope this helps! Please correct me if I'm wrong :)

Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as " fixed composition".

A chemical compound has a predictable makeup. Every sample of a compound has almost the same composition, or even the identical proportion, by mass, of the components contained in the compound, as per Proust's reasoning.

Atomic building blocks make up molecules.

Therefore, every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as " fixed composition".

Hence, the correct answer will be option (B)

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C₆H₁₂O₆   +    6O₂    --->   6CO₂   +   6H₂O, If 7.5 g of glucose react with 5.5 L of oxygen,  the limiting reagent is glucose.

The balanced reaction is given as :

C₆H₁₂O₆   +    6O₂    --->   6CO₂   +   6H₂O

mass of glucose = 7.5 g

molar mass of glucose = 180 g/mol

number of moles =mass / molar mass

                            = 7.5 / 180

                            = 0.041 mol

volume of oxygen = 5.5 L

density of oxygen = 1.42 g/ml

mass = density × volume

mass = 1.42 × 5.5

mass = 7.81

moles = mass / molar mass

           = 7.81 / 32

           = 0.244 mol

mass of reactant from each product:

now, glucose ,  mass of CO₂ = 0.041 × 6 × 44 = 10.84 g

oxygen, mass of CO₂ = 0.244  × 6 × 44  = 64.41 g

Since glucose gives the smaller amount of product glucose is a limiting reagent.

Thus, C₆H₁₂O₆   +    6O₂    --->   6CO₂   +   6H₂O, If 7.5 g of glucose react with 5.5 L of oxygen,  the limiting reagent is glucose.

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Answer:

I think a small spark can start a huge explosion because, a spark or a small firework for an example, can start a fire. You don’t want to have a spark or sparkler lit in your house. This is why I think that it could start a fire.

Explanation:

reasoning

My reason is that if you have a lighter, and you lite the sparkler or spark, you will definitely see a flame glowing at the top. One reason for why you need to lite things that could start fires outside is, that it can be deadly if you accidentally leave one inside or somewhere close to your house or a window. Another piece of evidence is one from a movie. This scenario is kind of like the one in a dogs purpose. A dog’s purpose is about how a dog begins there life as a puppy, they eventually end up having to be saved again by their owner but that’s the summary for just the small unimportant parts. But the real reason for why I’m comparing the question to this is because, in the movie, the rising action, is kind of when the dog, gets put to sleep. But after it goes on all different types of adventures both dangerous, boring at times, and then mood changing I think the story is similar to the question because, a adult sets a fire on the house and the owner of the dog and the owners mom have to get out with there dog. The owner that’s a boy or adult boy, has to jump out the window after saving his dog and this is how a small spark can make a huge impact or life changing lesson.

The strongest acid is e. p-nitrobenzoic acid.

To determine the strongest acid among the given compounds, we need to consider the stability of the corresponding conjugate base. The stronger the acid, the more stable its conjugate base.

Let's analyze each compound:

a. m-methylbenzoic acid: The presence of an electron-donating methyl group (-CH₃) attached to the benzene ring stabilizes the conjugate base by dispersing the negative charge. Therefore, it is weaker than benzoic acid (with no substituents), making it a weaker acid.

b. m-methoxybenzoic acid: The methoxy group (-OCH₃) is also an electron-donating group, similar to the methyl group. It stabilizes the conjugate base, making it weaker than benzoic acid as well.

c. water: Water (H₂O) can act as an acid by donating a proton (H⁺), but compared to the carboxylic acids in the other options, water is a weaker acid.

d. p-bromobenzoic acid: The presence of a bromine atom (-Br) does not have a significant effect on the acidity compared to benzoic acid.

e. p-nitrobenzoic acid: The nitro group (-NO₂) is an electron-withdrawing group, which destabilizes the conjugate base by withdrawing electron density. This electron-withdrawing effect makes p-nitrobenzoic acid more acidic than the other options.

Therefore, among the given compounds, the strongest acid is e. p-nitrobenzoic acid.

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