4. Are the giants hotter than our sun?

yes

no

not enough information

The sodium-potassium pump does not run out of ions since ion exchange is essential for the action potential to take place and to maintain homeostasis.

The cell has variable concentrations of different substances compared to the environment that surrounds it, with significant differences with sodium and potassium.

Therefore, we can conclude that the sodium potassium pump produces an exchange of potassium ions for sodium ions which keeps the cellular system functioning properly.

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Answer:

Scandium (Sc)

Explanation:

Cr³⁺ is a chromium atom that has lost 3 electrons. A chemical specie becomes positively charged when the number of electrons is lower than the number of protons.

 In this regard, the number of protons is more.

Chromium originally has 24 electrons, on losing 3 electrons it will now have 21 electrons.

The atom with 21 electrons in its neutral state is scandium

Al₂(SO₄)₃

= 2.Al+3.S+12.O

= 2.27 + 3.32+12.16

= 54+96+192

=342 g/mol

It is possible to predict the absorbance of a 214 mm solution of nickel(ii) chloride.

The calibration curve  is a plot of absorbance against concentration for various standard solutions of the analytes.

The slope of the graph is 0.25 and the y intercept is zero. Now A = ecl

c= A/el

c = 0.66/0.25 × 1

c= 2.64

It is possible to predict the absorbance of a 214 mm solution of nickel(ii) chloride by the use of the regression line from the calibration curve because the same instrument is used for the measurement of the new compound.

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The substance with stronger surface tension when in the liquid state between methane (CH4) and silane (SiH4) is silane (option b).

Surface tension is a property that describes the cohesive forces between molecules at the surface of a liquid.

Silane (SiH4) has a stronger surface tension compared to methane due to the presence of silicon (Si) atoms. Silicon atoms have larger atomic size and higher atomic mass compared to carbon (C) atoms in methane. These factors contribute to stronger intermolecular forces, resulting in increased surface tension.

In general, surface tension is influenced by factors such as molecular size, intermolecular forces, and molecular shape. The presence of larger atoms or molecules and stronger intermolecular forces tends to enhance surface tension. Silane, being a larger molecule with silicon atoms, experiences stronger intermolecular forces compared to methane, which consists of smaller carbon atoms.

Therefore, silane exhibits higher surface tension when in the liquid state.

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Answer:

Yes

Explanation:

3NaOH + H3PO4

3Na + 3O + 3H + 3H + P + 4O

3Na + 7O + 6H + P

Na3PO4 + 3H2O

3Na + P + 4O + 6H + 3O

3Na + 7O + 6H + P

magnets attract everything with metal inside of it

Answer: magnets attract everything with metal inside of it

Explanation:

The electricity generated that powers the watch by zinc in the battery combines with oxygen in the air, zinc oxide forms reaction is a product.

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A glucose molecule contains 6 atoms. When the atoms in a compound have an entire outermost electron shell, the compound is stable. Vertical columns in the periodic table are referred to as groups or families.

What causes atom to become charged when ionic bond is formed?

Atoms become charged when electrons are transferred from one atom to another and form an ionic bond. This results in the formation of a positive ion (cation) and a negative ion (anion), which are attracted to each other and form an ionic bond.

Where are non metals located on periodic table?

Nonmetals are typically found on the periodic table's right side. Groups or families refer to the vertical columns of the periodic table.

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0.3 moles of Oxygen is excess reactant (reagent) when yield is 100% .

NO =5.6 moles

O2= 3.1 moles

2NO + O2 --> 2NO2 the chemical reaction.

the ratio of NO and O2 is 2:1

therefore for 5.6 moles of NO, 2.8 moles of Oxygen(O2) is required. So 3.1moles - 2.8 moles = 0.3 moles

The reactant in a chemical reaction that is present in a quantity that is larger than what is required to fully react with the limiting yield is known as the excess reactant. The substance(s) still present after a chemical reaction has reached equilibrium in yield are the reactant(s). Subtract the mass of excess reagent eaten from the total mass of excess reagent provided to determine the quantity of yield that is still present. Reactants in a chemical reaction are referred to as excess reagents if they are still present after the reaction is complete.

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1.0 mole of C must completely react to produce 2.0 moles of C2H6.

The balanced chemical equation provided is:

2 C + 3 H2 → C2H6

In the given chemical equation 2 C + 3 H2 → C2H6, the coefficients represent the stoichiometric ratios of the reactants and products. These coefficients indicate the relative number of moles of each substance involved in the reaction. According to the equation, 2 moles of C are required to produce 1 mole of C2H6. This means that for every 2 moles of C2H6 produced, there must be 2 moles of C involved. If we want to determine the number of moles of C required to produce 2.0 moles of C2H6, we can use the stoichiometric ratio. Since the ratio of C to C2H6 is 2:1, we divide the given number of moles of C2H6 by 2 to find the corresponding number of moles of C. By dividing 2.0 moles of C2H6 by 2, we get 1.0 mole of C. This means that in order to produce 2.0 moles of C2H6, we need 1.0 mole of C to completely react.

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Answer:

150

Explanation:

300 divided by 2

Answer:

Fractional distillation

Explanation:

The process of separating petroleum products into its fractions is called fractional distillation.

Fractional distillation is a method of separating a mixture of substances based on the differences in their boiling points.

Petroleum is a mixture of hydrocarbons separated in a large fractionation tower having many trays maintained at different temperatures.

As the vapor containing the petroleum mixture ascends the fractionation tower, the mixture is separated at each tray to yield the various fractions of petroleum.

Answer:

The 2 one

Explanation:

Answer:To determine the number of valence electrons in an atom of a representative element, you can look at its position on the periodic table. Representative elements are also known as the main group elements and are located in groups 1-2 and 13-18 of the periodic table.

The number of valence electrons in an atom of a representative element is equal to the group number. For example, the elements in group 1 (also known as the alkali metals) have 1 valence electron, while the elements in group 2 (the alkaline earth metals) have 2 valence electrons. The elements in group 13 (the boron group) have 3 valence electrons, and so on, up to group 18 (the noble gases), which have a full set of 8 valence electrons (except for helium, which has only 2).

For example, let's consider the element sodium (Na), which is in group 1. Sodium has 1 valence electron because it is in group 1. Similarly, the element carbon (C), which is in group 14, has 4 valence electrons because it is in group 14.

Knowing the number of valence electrons in an atom is important because it helps to determine the chemical properties and reactivity of the element. Atoms with the same number of valence electrons tend to have similar chemical properties and can form similar types of chemical bonds.

Explanation:

Naming 2-methyl-2-butene involves identifying the parent chain, identifying the functional groups, and indicating the position of the functional groups by using numbers. Organic compounds are often named based on their molecular structure and functional groups.

The first step in naming 2-methyl-2-butene is to identify the parent chain is a four-carbon chain, and the molecule is therefore named as a butene.

Next, we identify the position of the functional group is a methyl group, which is a carbon atom bonded to three hydrogen atoms.

Finally, we indicate the position of the functional group by using numbers to indicate the carbon atoms to which is attached. In this case the methyl group is attached to the second carbon atom in the parent chain, so the molecule is named 2-methyl-2-butene.

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Doubling solvent volume would decrease reactant concentration, reducing reaction rate by a factor of 1/2 (option b).

Doubling the volume of solvent in a nucleophilic substitution reaction, as shown in the given prototypical reaction of \(CH_3Br\) and -OH, would have an effect on the reaction rate.

The rate of a reaction depends on the concentration of reactants, and doubling the volume of solvent would decrease the concentration of reactants.

Specifically, the concentration of \(CH_3Br\) would decrease, resulting in a lower reaction rate. To determine the factor by which the reaction rate would decrease, we can use the reaction order, which is first order for this reaction.

Therefore, doubling the solvent volume can decrease the reaction rate by option (b) factor of 1/2.

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The effect of doubling the volume of solvent would be to multiply the reaction rate by a factor, CH3Br + -OH --> CH3OH + Br- is 1/4. The answer is option (a).

Doubling the volume of solvent results in a decrease in the concentration of both the substrate and the nucleophile. Since the rate of reaction is dependent on the concentration of the reactants, decreasing their concentrations will decrease the reaction rate.

The rate of reaction is proportional to the concentration of both the substrate and the nucleophile, so doubling the volume of the solvent will result in a decrease in the reaction rate by a factor of 1/4.

To understand this, consider the reaction rate equation: rate = k[substrate][nucleophile]. If we double the volume of the solvent, the concentrations of the substrate and nucleophile are halved, so the rate becomes: rate = k[(1/2)[substrate]][(1/2)[nucleophile]] = (1/4)k[substrate][nucleophile].

Thus, doubling the volume of solvent reduces the reaction rate by a factor of 1/4.

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There is no statement that is not true about β-sheets in the given options. Option D is correct.

β-sheets are a common structural motif in proteins, characterized by the arrangement of multiple beta strands connected by hydrogen bonds. β-strands are stretches of peptide backbone that are nearly fully extended, forming a zigzag conformation, and they can be either parallel or antiparallel.

The arrangement of β-strands and their directionality determine the overall structure and stability of the β-sheet. β-sheets are important for protein stability, function, and recognition, and they play critical roles in many biological processes.

Beta sheets are formed by the two or more beta strands connected by the hydrogen bonds, and can be arranged in either parallel or antiparallel configurations.

Hence, D. None of the above (they are all true) is the correct option.

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How much energy is required to raise the temperature of 3 kg of aluminum from 18°C to 23°C? Use the table below and this equation: Q=mcΔT

The given nuclear equations are:

Na-24 → -10 + Pt-78

Pt-170 → 24 + Xe-54

I-118 → 53 + Te-118

In each of these equations, the arrow represents a nuclear reaction. The particle on the left side of the arrow is the reactant, while the particles on the right side of the arrow are the products of the reaction.

In the first equation, Na-24 undergoes a beta decay, which means it emits a beta particle, represented as -10. The product of this reaction is Pt-78.

In the second equation, Pt-170 undergoes an alpha decay, which means it emits an alpha particle, represented as 24. The product of this reaction is Xe-54.

In the third equation, I-118 undergoes a beta decay, which means it emits a beta particle, represented as 53. The product of this reaction is Te-118.

In nuclear reactions, the law of conservation of mass and the law of conservation of charge must be obeyed. This means that the sum of the atomic numbers and the sum of the mass numbers of the reactants and products must be equal.

In summary, the given nuclear equations represent different types of nuclear decay, such as beta decay and alpha decay, and show the transformation of one element into another by the emission of particles. These reactions have important applications in nuclear power generation, medical imaging, and other fields of science and technology.

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Answer:

it would break when it hits the ground

Explanation:

Answer:

200 n

Explanation:

(a) Balanced net ionic equation: Cr³⁺(aq) + 3CO₃²⁻(aq) → Cr₂(CO₃)₃(s); spectator ions: 2NH₄⁺(aq) and 3SO₄²⁻(aq).

(b) Balanced net ionic equation: Ag+(aq) + SO₄²⁻(aq) → Ag₂SO₄(s); spectator ions: K⁺(aq) and NO₃⁻(aq).

(c) Balanced net ionic equation: Pb²⁺(aq) + 2OH⁻(aq) → Pb(OH)₂(s); spectator ions: 2K⁺(aq) and 2NO₃⁻(aq).

(a) To write the balanced net ionic equation for the reaction between Cr₂(SO₄)₃ and (NH₄)₂CO₃, we first need to write the complete ionic equation:

Then, we eliminate the spectator ions (NH₄⁺ and SO₄²⁻) to get the net ionic equation:

(b) For the reaction between AgNO₃ and K₂SO₄, the complete ionic equation is:

Eliminating the spectator ions (K⁺ and NO₃⁻) gives the net ionic equation:

(c) Finally, for the reaction between Pb(NO₃)₂ and KOH, the complete ionic equation is:

Eliminating the spectator ions (K⁺ and NO₃⁻) gives the net ionic equation:

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Answer:

oil floats on water because it is heavier than water

Salt is no longer visible after stirring as salt dissolves in water

by filtration