(Bonus) What is the most likely charge for a strontium (Sr, #38) ion? (1 pt)
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1 point
-1
+1
-2
+2
-3
+3

The process of a liquid becoming a gas is called boiling (or vapourization) and the process of a solid becoming a liquid is called melting.

Vaporization is the process of converting a liquid into a gas. It is also called evaporation. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas.

Melting is a physical process that results in the phase transition of a substance from a solid to a liquid. During melting, the energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature.

Example 1: Industrially, salt is recovered from seawater by the process of vaporization. Wet clothes are dried up due to the process of vaporization. The process is used in many industrial processes for separating the components of a mixture.

Example 2: Ice to water - Ice melts back into the water when it is left out at temperatures above the freezing point of 32 degrees. Rocks to lava - Rocks in volcanoes can be heated until they are molten lava. Metal to molten liquid - Metals such as steel and bronze can be molten down.

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The precipitate is barium chromate.

The term precipitate refers to a solid that separates out in an aqueous phase reaction. In this case, we have two reactants in aqueous phase which is potassium dichromate and barium ions. We know that this reactions must produce a solid product. This solid product is what we call a precipitate.

The precipitate in this case is a pure white solid that is completely insoluble in water but could dissolve slightly in an acidic solution. We have to remember also that in this case, the barium ions could be sequestrated from the system by the addition of the dichromate solution.

Let us consider the reaction equation; \(K_{2} CrO_{4} (aq) + Ba^{2+} (aq) ----- > BaCrO_{4} (s)+ 2K^{+} (aq)\). From here it is obvious that a precipitate is formed and that is barium chromate.

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Answer:

Polar covalent bond

Explanation:

When the electronegativity difference between two elements A and X is 0.8, the bond AX formed will most likely be a polar covalent bond.

A polar covalent bond is one whose electronegativity difference is between 0.5 and 2.1.

In such a bond type, we have heteronuclear species with one of the species having a higher electronegativity value.

The equilibrium constant (K) for the first reaction is approximately 0.000092.

Let's recalculate the equilibrium constant (K) using the correct values.

ΔG for the first reaction = -8.30 kJ/mol

ΔG for the hydrolysis of ATP to AMP = -31.6 kJ/mol

We can use the relationship between ΔG and K:

ΔG = -RT ln(K)

Where:

ΔG = ΔG1 + ΔG2 (since the reactions are coupled)

R is the gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin (25°C = 298 K)

Converting the units for ΔG:

ΔG1 = -8.30 kJ/mol × (1000 J/kJ) = -8300 J/mol

ΔG2 = -31.6 kJ/mol × (1000 J/kJ) = -31600 J/mol

ΔG = ΔG1 + ΔG2 = -8300 J/mol + (-31600 J/mol) = -39900 J/mol

Now we can rearrange the equation to solve for K:

K = e^(-ΔG / RT)

Substituting the values:

K = e^(-(-39900 J/mol) / (8.314 J/(mol·K) × 298 K))

Simplifying:

K = e^(39900 J / (8.314 J·K/mol × 298 K))

K ≈ e^(15.83 mol^-1)

Calculating:

K ≈ 0.000092

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Answer:

1.67

Explanation:

10 ÷ 6= 1.67 moles of glucose.

Answer:

It will reduce

Explanation:

The time it will take to bake the cake will reduce when the temperature is increased by an additional 20°F .

Temperature change has a considerable effect on reaction rates since temperature is directly proportional to the average kinetic energy of reacting particles.

Generally reaction rate varies as temperature directly.

Therefore, the baking time will reduce as temperature increases.

Hope you could understand.

If you have any query, feel free to ask.

Answer:

B their larger size . this is right

Answer:

The answer is B. here is proof. Plz mark brainliest.

Explanation:

The concentration, in m/v percent, of a solution prepared from 50. g nacl and 2.5 l of water is 2 %.

The mass/volume percent is the ratio of a solution's total volume to the mass of the solute that makes up that solution. Since this type of concentration has been expressed as a percentage, the given proportion should be multiplied by 100.

The calculation if concentration is shown as:

It can be calculate as follows:

% NaCl = Mass of NaCl / Total mass × 100 %

% NaCl = 50 gram / 2500 × 100 %

%  NaCl = 2 %.

As a result, the solution made from 50 g of nacl and 2.5 l of water will have a 2% concentration.

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Answer:

base

Explanation:

less than 7 is acidic, 7 is neutral, and more than 7 is basic!!

260grams

The formula for calculating the moles of NaOH is expressed as

Determine the required mass of NaOH

Hence the grams of sodium hydroxide (NaOH) you need to make 6.5 L of 1.0M solution is 260grams

Answer:

2L of nitrogen gas will be needed

Explanation:

Based on the following reaction:

N₂ + 3H₂ → 2NH₃

1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia.

If 6L of hydrogen (In a gas, the volume is directly proportional to the moles, Avogadro's law) react, the volume of nitrogen gas required will be:

6L H₂ * (1mol N₂ / 3 moles H₂) =

Based on observation of polar and non-polar molecules, polar molecules would attract each other more strongly.

Polar molecules are those molecules that can ionize or dissociate into their respective positive and negative ions when in an aqueous solution.

Nonpolar molecules, on the other hand, are not ionic i.e. not dissociating into ions when dissolved in water.

Polar molecules like water (H2O) contains an uneven distribution of cations (+) and anions (-), hence, would be more attracted to one another than nonpolar molecules that have an even distribution of ions.

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Iron filings burning when sprinkled over a gas flame to produce iron(III) oxide is an example of a combustion reaction.

.In this case, the iron filings (Fe) react with oxygen from the gas flame to form iron(III) oxide (Fe₂O₃). The reaction can be represented by the following equation:

4Fe + 3O₂ → 2Fe₂O₃

During the combustion process, the iron filings undergo a chemical change as they combine with oxygen to form a new compound, iron(III) oxide. This reaction is exothermic, meaning it releases energy in the form of heat and light. The heat produced causes the iron filings to burn, resulting in the formation of iron(III) oxide.

Iron(III) oxide is a reddish-brown compound commonly known as rust. It has a different chemical composition and physical properties compared to the original iron filings. The reaction between iron and oxygen is highly exothermic, making it a suitable demonstration for the combustion process.

In summary, the burning of iron filings when sprinkled over a gas flame to produce iron(III) oxide is a combustion reaction where iron reacts with oxygen to form a new compound, releasing heat and light in the process.

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Answer:

hcl is a covalent compound

Explanation:

The incorrect statement is option C, which states that fatty acid biosynthesis uses NADPH exclusively, whereas β oxidation uses NAD+ exclusively. This is incorrect because both processes use both NADPH and NAD+.

Fatty acid biosynthesis requires NADPH for the reduction of the growing fatty acid chain, while β oxidation requires NAD+ for the oxidation of the fatty acid chain. The other statements are correct. Option A is correct because crotonyl-CoA is an intermediate in fatty acid biosynthesis, while trans-2-buteneoyl-CoA is not. Option B is correct because D-β-hydroxybutyryl-CoA is an intermediate in the biosynthetic pathway of ketone bodies, but not in β oxidation. Option D is correct because fatty acid degradation occurs in the cytosol, while fatty acid synthesis occurs in the mitochondria. Finally, option E is correct because the buffer used can affect the rate of reaction for the condensation of two moles of acetyl-CoA, but it does not affect the cleavage of acetoacetyl-CoA.

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While cirrocumulus clouds may have some minor impact on the Earth's energy balance by reflecting sunlight, their role in the greenhouse effect is negligible compared to the greenhouse gases themselves.

Cirrocumulus clouds do not directly play a significant role in the greenhouse effect. The greenhouse effect refers to the process by which certain gases in the Earth's atmosphere trap heat from the sun, leading to an increase in the planet's temperature. The primary greenhouse gases responsible for this effect are carbon dioxide, methane, and water vapor.Cirrocumulus clouds, also known as high-level clouds, are composed of ice crystals and form at altitudes above 20,000 feet. They are thin, white, and often appear as small, rounded puffs or ripples in the sky. While these clouds can reflect some sunlight back into space, their overall impact on the greenhouse effect is minimal.In contrast, low-level clouds such as stratus or cumulus clouds can have a more significant influence on the greenhouse effect. These clouds have a higher potential to reflect incoming solar radiation and cool the Earth's surface, thus partially counteracting the warming effect caused by greenhouse gases.

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Answer: The correct answer is 188.03K.

Explanation:

As a result, the gas sample will have a volume of 551mL at a temperature of 188.03K.

Answer:

The cell grows into its full size

The cell copies it’s dna

Explanation:

hope this helps pls mark brainliest

Answer:

A) It increases when the concentration of reactants increases.

Explanation:

When you increase the concentration, there is more of a substance, and therefore more opportunities for the reactants to collide together with enough energy to create a product.

Answer:

A) It increases when the concentration of reactants increases.

Explanation:

It's just right!!!

Answer:

320.23g of CH3OH.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CO(g) + 2H2(g)—> CH3OH(l)

Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:

Molar mass of CO = 12 + 16 = 28g/mol

Mass of CO from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2= 4g

Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol

Mass of CH3OH from the balanced equation = 1 x 32 = 32g

From the balanced equation above,

28g of CO reacted with 4g of H2 to produce 32g of CH3OH.

Next, we shall determine the the limiting reactant. This is illustrated below:

From the balanced equation above,

28g of CO reacted with 4g of H2.

280.2g of CO will react with =

(280.2 x 4)/28 = 40.03g of H2.

From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.

Therefore, CO is the limiting reactant and H2 is the excess reactant.

Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.

In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:

From the balanced equation above,

28g of CO reacted to produce 32g of CH3OH.

Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.

Therefore, 320.23g of CH3OH were produced from the reaction.

It has 8 valence electrons.

The valence electrons in each family of elements are:

Boron, Carbon, and Neon are elements that belong to different families.

Boron and Carbon are members of the Carbon family, while Neon is part of the Noble gas family.

They have a varying number of valence electrons.Boron has three valence electrons in its outermost shell.

Carbon has four valence electrons in its outermost shell.

Neon has eight valence electrons in its outermost shell.

Hence, the number of valence electrons in Boron, Carbon, and Neon are 3, 4, and 8, respectively.

Also, we can say that each family of elements has a specific number of valence electrons that help to determine their chemical and physical properties.

The number of valence electrons can be easily found using the Group number of the element in the periodic table.

The Group number of an element represents the number of valence electrons an element has.

For example, Boron and Carbon are present in Group 13 and Group 14, respectively, which means they have 3 and 4 valence electrons.

Neon, on the other hand, is present in Group 18, and it has 8 valence electrons.

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Answer:

which subjet is this math science or history

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer:

When for example, heating up an ice cube the particles of the ice start to vibrate fast enough to get separated into liquid caused from high temperature. So the answer is Higher.

The amount of millimoles of solid naoh that must be added to 50.0 milliliters is: 5.0 mmol of NaOH.

The [H+] at pH 7.49 is:

[H+] = 10–^7.49

[H+]= 3.24×10–^8 M

And when the solution is half-neutralized pH will be:

pH = pKa while  [OCl– ]÷[HOCl] = 1

Now let find the millimoles of solid naoh:

0.20 mol HOCl÷1 L× 50.0 mL

= 10.0 mmol HOCl

Half of 10.0 mmol HOCl will be added

Millimoles of solid naoh=10.0 mmol HOCl÷2

Millimoles of solid naoh= 5.0 mmol of NaOH

Inconclusion the amount of millimoles of solid naoh that must be added to 50.0 milliliters is: 5.0 mmol of NaOH.

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This will be the volume if 0.2 M NaOH is used.

NaOH = 1:3.25

The molar mass is the substance; it helps to determine the mass of the sample substance to the atom of the sample or substance. The molar mass depends on the molecular formula and the isotopes of the atom. Molar mass is used for the inducement of electric charge. Molar mass is the measurement of the volume of the mass. The molar mass is expressed in the unit of dalton.

The term matter defines mass, and it measures matter. Mass is discovered from the different atoms and particles. Group, in simple terms, determines the weightage of the substance. Mass is expressed in the terms kilograms. Mass of the quantity is a much-needed thing in the laboratory. The quantity of the substance does the majority of the experiment. Gravity also takes place as an independent factor in calculating mass. Mass is the scalar quantity. Gravity and force are playing the independent factor in the mass. For calculating the two planet mass, know the force of the planet.

So, one mole of fat will react with 3.25 moles of NaOH.

First of all, calculate the number of moles of fat.

moles of fat = mass of fat/ molar mass of fat

moles of NaOH required for this reaction = 3.25 * (mass of fat/ molar mass of fat)

0.2 M NaOH = 0.2moles of naOH is present in 1 L of solution

So, 3.25 * (mass of fat/ molar mass of fat) moles of NaOH   in present in = [3.25 * (mass of fat/ molar mass of fat) ]/0.2.

Therefore, This will be the volume if 0.2 M NaOH is used.

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Answer

Mass of (H30)2CrO = 38 g

Explanation

Given:

Mass of Sn(CrO4)2 = 43.4 g

Mass of (H3O)2HPO4 = 35.2 g

Required: The mass of (H30)2CrO4 that will be produced

Solution:

Calculate the possible mass that could be produced by each reactant, so as to determine the limiting reagent. Use stoichiometry.

For Sn(CrO4)2:

For (H3O)2HPO4

Sn(CrO4)2 will produce less (H30)2CrO4 therefore, Sn(CrO4)2 is the limiting reagent.