Final answer:
The mass of 15 cm³ of gold, with a density of 19.3 g/cm³, is 289.5 g when calculated using the formula m = d × V.
Explanation:
The density of gold is 19.3 g/cm³.
To find the mass of 15 cm³ of gold, you can use the formula for density, which is mass divided by volume (d = m/V).
Since we know both the density and the volume, we can rearrange the formula to solve for mass (m = d × V).
In this case, the mass (m) would be 19.3 g/cm³ times 15 cm³, which equals 289.5 g.
What is the mass of 4.5 x10 23 molecules of so2?
The mass of 4.5 x 10^23 molecules of SO2 is approximately 578.7 grams.
Explanation:The mass of 4.5 x 1023 molecules of SO2 can be calculated using the molar mass of SO2. The molar mass of SO2 is approximately 64.06 g/mol. To find the mass of 4.5 x 1023 molecules, we can use the following steps:
Using these steps, the mass of 4.5 x 1023 molecules of SO2 is approximately 578.7 grams.
Gravitational Attraction: Mass is also involved in the gravitational interaction between objects. The gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Conservation of Mass: The principle of the conservation of mass states that the total mass of a closed system remains constant over time, regardless of the processes occurring within the system.
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what is the main reason scientists perform experiments
a) to summarize experimental information
b) to collect scientific data
c) to find answers to their questions
d) to play with equipment in the lab
Scientists perform experiments primarily to find answers to their questions by testing hypotheses and analyzing the collected scientific data to draw conclusions.
The main reason scientists perform experiments is c) to find answers to their questions. They do this by following the scientific method, which includes developing a hypothesis, designing an experiment to test the hypothesis, collecting and analyzing scientific data, and then drawing a conclusion. If the hypothesis is supported, further related hypotheses may be tested; if it is rejected, a new hypothesis may be formulated. Scientists summarize experimental information, compare related things or aspects, and record the results of an experiment to further our understanding of the natural world.
Write a balanced chemical equation for the photosynthesis reaction in which gaseous carbon dioxide and liquid water react in the presence of chlorophyll to produce aqueous glucose (c6h12o6) and oxygen gas. express your answer as a chemical equation. identify all of the phases in your answer.
True or false a mixture is the chemical bonding of two or more substances in any proportion
Lead has a density of 11.3 g/cm3. if you have 1.0 kg of lead, what is the volume in cubic centimeters (cm3)? remember to select an answer with the correct number of significant figures.
The volume of 1.0 kg of lead is 88.5 cm³.
Explanation:To find the volume of 1.0 kg of lead, we need to divide the mass of lead by its density. The density of lead is given as 11.3 g/cm3. First, we need to convert the mass of lead from kg to g by multiplying it by 1000 (since there are 1000 g in 1 kg). So, 1.0 kg of lead is equal to 1000 g. Now we can use the density formula: Density = Mass/Volume. Rearranging the formula gives us Volume = Mass/Density. Plugging in the mass of lead (1000 g) and the density of lead (11.3 g/cm3), we get: Volume = 1000 g / 11.3 g/cm3 = 88.5 cm3. Therefore, the volume of 1.0 kg of lead is 88.5 cm3.
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Express in scientific notation. Choose the answer with the proper number of significant figures. 69,000,000,000 = _____
Answer:
69,000,000,000 = [tex]6.9*10^{10}[/tex]
Explanation:
Hello! Let's solve this!
To express a number in scientific notation, we must first choose the number between 0 and 9. In this case the number chosen is 6.9.
Then we multiply * 10 and the exponent of 10 we assign it as follows:
If the point was run to the left, the exponent is positive. If the point was run to the right, the exponent is negative.
In this case the point was run 10 places to the left. The scientific notation is:
69,000,000,000 = [tex]6.9*10^{10}[/tex]
A fatty acid which contains only single covalent bonds between its carbon atoms is unsaturated.
Saturated fatty acids are those with single bonds between carbons, maximized with hydrogen atoms. Unsaturated fatty acids contain one or more double bonds. The type of bond influences the fatty acid's properties.
Explanation:The statement in your question seems to have a misunderstanding. A fatty acid that contains only single covalent bonds between its carbon atoms is actually a saturated fatty acid, not unsaturated. This is because in a fatty acid chain, if there are only single bonds between neighboring carbons in the hydrocarbon chain, it is said to be saturated. Saturated fatty acids, such as stearic acid, are in simplest terms, saturated with hydrogen. This simply means the number of hydrogen atoms attached to the carbon skeleton is maximized.
On the other hand, fatty acids that have one or more double bonds between carbons in the chain are classified as unsaturated fatty acids. Examples include monounsaturated fats, which have one double bond in the molecule (like in olive oil), and polyunsaturated fats, which have more than one double bond in the molecule (such as in canola oil). An example of an unsaturated fatty acid is oleic acid.
Remember that the nature of bonds (single or double) in a fatty acid affects its properties, such as its state at room temperature. Saturated fatty acids generally are solid or semi-solid at room temperature, while unsaturated fatty acids usually are liquid.
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Which term represents a chemical reaction?
Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically.
What is chemical reaction ?In a chemical reaction, one or more substances—also known as reactants—are changed into one or more additional substances—also known as products.
Chemical equations are used to model chemical reactions. To display the same amount of atoms of each element on each side, chemical equations are balanced. The Law of Conservation of Mass, which is found in chemistry, stipulates that matter cannot be created or destroyed.
When an object combines with oxygen gas (O2), a combustion reaction occurs and energy is liberated. There will be a combustion reaction if a sparkler is burned.
Thus, Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically.
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An open end mercury manometer was constructed from a u-shaped tube. in a particular measurement, the level in the end connected to the gas manifold, on which the experiment was being conducted, measured 76.2 cm above the u-neck, while the level in the open end (to the atmosphere) was 23.8 cm above the u-neck. the outside air pressure in the laboratory was measured as 754 torr. what is the pressure in the gas manifold?
The pressure in the gas manifold can be computed by adding the atmospheric pressure (754 torr) to the pressure difference in the manometer (52.4 torr), yielding an absolute pressure of 806.4 torr.
Explanation:The question pertains to the use of an open-end mercury manometer, a tool used to measure the pressure of a gas. The difference in height between the mercury levels on the gas side and the open side of the tube represents the pressure of the gas relative to atmospheric pressure.
In your case, the gas side is 76.2 cm above the U-neck, while the open side is 23.8 cm above. The pressure difference (Δh) is therefore 76.2 cm - 23.8 cm = 52.4 cm. Remembering that 1 torr is approximately equal to 1 cm of mercury, the pressure of the gas is therefore 52.4 torr above atmospheric pressure.
However, because the atmospheric pressure in the lab is 754 torr, we must add this to our pressure difference to get the absolute pressure of the gas in the manifold. So, the pressure in the gas manifold is 52.4 torr + 754 torr = 806.4 torr.
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The pressure in the gas manifold is found by determining the height difference between the mercury levels in the manometer, which is then added to the atmospheric pressure. The result, 806.4 torr, is the pressure within the gas manifold.
Explanation:The subject of your question relates to the area of physics, specifically fluid dynamics and pressure. In the scenario described, we are dealing with an open-end mercury manometer, which serves as a pressure measurement tool. The pressure in the gas manifold can be determined using the measurements provided and the principles of pressure in manometers.
Firstly, let's find the height difference between the mercury levels. Subtract the level in the open end from the level on the gas manifold side (76.2 cm - 23.8 cm = 52.4 cm). Given that the air pressure is provided in torr, we need to keep consistent units, so 1 cm of Hg equals 13.6 mm of water, which equates to about 1 torr of pressure. Therefore, our height difference is 52.4 torr.
Finally, to find the pressure in the gas manifold, add the atmospheric pressure to the difference in pressure measured by the manometer (754 torr + 52.4 torr = 806.4 torr). Thus, the pressure in the gas manifold is 806.4 torr.
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Which is a characteristic of the polar water molecule
Water molecules are polar due to an uneven distribution of electrons between oxygen and hydrogen atoms, with oxygen being more electronegative, leading to a partial negative charge, and hydrogen having a partial positive charge.
A characteristic of the polar water molecule is its inherent separation of charge, making it polar. The water molecule has a bent 'V' shape with two hydrogen atoms and one oxygen atom, where the oxygen atom has a higher electronegativity than hydrogen atoms. This means electrons are more strongly attracted to the oxygen nucleus, which makes the oxygen end slightly negative and the hydrogen ends slightly positive. The separation of charge enables water molecules to attract ions, align with external fields, and shield electric fields in biological systems. Moreover, the polar nature of water allows for the formation of hydrogen bonds, contributing to water's unique properties, such as its high boiling point and surface tension.
What determines whether an atom becomes a positive ion or a negative ion?
How many oxygen atoms are present in 23.6 grams of aspartame?
There are approximately 2.41 x 1024 oxygen atoms in 23.6 grams of aspartame. The calculation involves determining the molecular mass of aspartame, finding the number of moles in 23.6 grams and multiplying it by the number of oxygen atoms per molecule and Avogadro's number.
Explanation:To determine the number of oxygen atoms in 23.6 grams of aspartame, we first need to find the molecular mass of aspartame (C14H18N2O5). This is done by adding up the atomic masses of the constituent atoms, which equals to 294.31 g/mol. Next, we use Avogadro's number, which states that one mole of any substance contains 6.02 x 1023 molecules.
Therefore, the number of moles of aspartame in 23.6 grams is 23.6/294.31, which equals to approximately 0.080 moles. Because each molecule of aspartame contains 5 oxygen atoms, we multiply the number of moles by 5 to get the number of moles of oxygen in 23.6 grams of aspartame. Then, we multiply this by Avogadro's number to obtain the number of oxygen atoms. Hence, there are approximately 2.41 x 1024 oxygen atoms in 23.6 grams of aspartame.
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What is the largest number that can be added to 6.022x10^23 without changing its displayed value?
To support a child's self-esteem, you can make all of these statements, except
A. "You're never going to get that shoe tied and we have to hurry."
B. "We're in a hurry right now, but you did a great job getting your right shoe tied. Can I help you with your left shoe?"
C. "You did a great job in finding your shoes."
D. "Look at you, you tied your shoes all by yourself."
To support a child's self-esteem, you can make all of these statements, except "You're never going to get that shoe tied, and we have to hurry." Therefore, option A is correct.
What is child's self-esteem ?A child's overall sense of worth or personal value is known as self-esteem. It expresses how people perceive themselves. A youngster must learn how to feel good about themselves because they are not born with high or poor self-esteem. The development of children's self-esteem is crucial.
Learning to accept our flaws while yet choosing to enjoy ourselves helps us develop self-esteem. Every time a youngster engages in effective exchanges using encouraging words, their sense of self-worth increases. Building a child's self-confidence in their ability to manage their life is crucial.
Furthermore, and we all make mistakes in life having self-esteem can help kids deal with making mistakes. These students will try again even if they first fail.
Thus, option A is correct.
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How many grams of ca(no3)2 can be produced by reacting excess hno3 with 6.33 g of ca(oh)2?
Answer:
Amount of Ca(NO3)2 produced = 14.02 g
Explanation:
The given reaction can be depicted as follows:
Ca(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O
Since it is given that HNO3 is in excess, the limiting reactant is Ca(OH)2
Now, Mass of Ca(OH)2 = 6.33 g
Molar mass of Ca(OH)2 = 74 g/mol
[tex]Moles\ Ca(OH)2 = \frac{Mass}{Molar\ Mass} = \frac{6.33 g}{74 g/mol} =0.0855[/tex]
Based on the reaction stoichiometry:
1 mole of Ca(OH)2 forms 1 mole of Ca(NO3)2
Therefore, moles of Ca(NO3)2 produced from the moles of Ca(OH)2 reacted = 0.0855 moles
Molar mass of Ca(NO3)2 = 164 g/mol
[tex]Mass\ Ca(NO3)2 \ produced = moles*molar\ mass \\= 0.0855\ moles*164\ g/mol = 14.02\ g[/tex]
14.022 grams of Ca(NO₃)₂.
Further explanationGiven:
The reaction between excess HNO₃ with 6.33 g of Ca(OH)₂ produces Ca(NO₃)₂.
Question:
How many grams of Ca(NO₃)₂ can be produced?
The Process:
Step-1
Relative atomic mass: Ca = 40, N = 14, O = 16, and H = 1.Relative molecular mass (Mr) of Ca(OH)₂ = 40 + 2(16 + 1) = 74.Relative molecular mass (Mr) of Ca(NO₃)₂ = 40 + 2[14 + 3(16)] = 164.Let us convert mass to mol of 6.33 g of Ca(OH)₂.
[tex]\boxed{ \ n = \frac{mass}{Mr} \ } \rightarrow \boxed{ \ n = \frac{6.33}{74} = 0.0855 \ moles \ }[/tex]
Step-2
Balanced reaction:
[tex]\boxed{ \ Ca(OH)_2 + 2HNO_3 \rightarrow Ca(NO_3)_2 + 2H_2O\ }[/tex]
Due to excess HNO₃, then Ca(OH)₂ become limiting reagents. The number of moles of Ca(OH)₂ determines the number of moles of Ca(NO₃)₂ as a result.
According to chemical equation above, proportion between Ca(OH)₂ and Ca(NO₃)₂ is 1 to 1. Therefore, we can count the number of moles of Ca(NO₃)₂.
[tex]\boxed{ \ \frac{n(Ca(NO_3)_2)}{n(Ca(OH)_2)} = \frac{1}{1} \ } \rightarrow \boxed{ \ n(Ca(NO_3)_2) = n(Ca(OH)_2) \ }[/tex]
Hence we get 0.0855 moles of Ca(NO₃)₂.
Step-3
Let us convert mol to mass of 0.0855 moles of Ca(NO₃)₂.
[tex]\boxed{ \ n = \frac{mass}{Mr} \ } \rightarrow \boxed{ \ mass = n \times Mr \ }[/tex]
[tex]\boxed{ \ n = 0.0855 \ moles \times 164 \ \frac{g}{mol} \ }[/tex]
Thus, we can produce 14.022 grams of Ca(NO₃)₂.
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Naproxen is known to be a weak acid. In order to calculate its ka and pka, use the equation of getting the ph of weak acid which is ph= -1/2 log [(Ka)(Mwa)]. The Ka value is 3.18x10^-5. The pKa can be obtained through pKa = - log Ka. The pKa is 4.5.
Answer:
[tex]Ka=6.43x10^{-5}[/tex]
[tex]pKa=4.19[/tex]
Explanation:
Hello,
In this case, the pH provides the concentration of hydrogen in its dissociation:
[tex]Naproxen\rightleftharpoons H^++Naproxen^-[/tex]
Thus, such concentration is:
[tex][H^+]=10^{-4.2}=6.31x10^{-5}M[/tex]
Thus, the Ka, by means of the dissociation law of mass action:
[tex]Ka=\frac{(6.31x10^{-5})^2}{1.25x10^{-4}-6.31x10^{-5}}=6.43x10^{-5}[/tex]
Hence the pKa is:
[tex]pKa=-log(Ka)=-log(6.43x10^{-5})=4.19[/tex]
Best regards.
How many pounds of coal would you have to burn to generate enough heat to boil a 15 l kettle?
The number of neutrons in the nucleus of a bromine atom that has a mass number of 80 is
If the density of water is 1.000 g/ml, what is the mass in grams of 1.000 gallons of water?
From the question,
Density =1.00g/ml
mass =?
volume = 1.000 gallons.
1 gallon of water = 3.785litre
D = M/v
D is Density
m is mass
v is volume.
Mass= Volume × Density
convert the volume to mililitre
1 litre = 1000ml
3.785 × 1000 = 3785 mililitres.
Therefore, mass = 3785 ×1
mass= 3785g
What is Density?Density is the ratio of mass of a substance to it's volume.
it is Mass÷volume.
Therefore, mass is 3785g.
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How much water would form if 4.8 grams of hydrogen reacted with 38.4 grams of oxygen?
According to the given reaction equation, 4.8 grams of hydrogen would react with 38.4 grams of oxygen to produce 43.2 grams of water.
Explanation:In this reaction, 2 moles of hydrogen gas (H2) react with 1 mole of oxygen gas (O2) to form 2 moles of water (H2O). To determine the amount of water formed, we need to convert the given masses of hydrogen and oxygen to moles and then use the mole ratio to calculate the moles of water produced.
Atomic mass of hydrogen (H) = 1 g/mol
Atomic mass of oxygen (O) = 16 g/mol
Number of moles of hydrogen (H2) = 4.8 g / 2 g/mol = 2.4 moles
Number of moles of oxygen (O2) = 38.4 g / 32 g/mol = 1.2 moles
According to the balanced equation, 2 moles of hydrogen react with 1 mole of oxygen to form 2 moles of water. Therefore, the number of moles of water formed is also 2.4 moles.
To find the mass of water formed, we can use the molar mass of water:
Molar mass of water (H2O) = 18 g/mol
Mass of water formed = 2.4 moles × 18 g/mol = 43.2 g
Therefore, 43.2 grams of water would form if 4.8 grams of hydrogen reacted with 38.4 grams of oxygen.
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The reaction below has an equilibrium constant kp=2.2×106 at 298 k. 2cof2(g)⇌co2(g)+cf4(g) calculate kp for the reaction below. cof2(g)⇌12co2(g)+12cf4(g)
I believe the correct 2nd reaction is:
cof2(g)⇌1/2 co2(g)+1/2 cf4(g)
where we can see that it is exactly one-half of the original
Therefore the new Kp is:
new Kp = (old Kp)^(1/2)
new Kp = (2.2 x 10^6)^(1/2)
new Kp = 1,483.24
The equilibrium constant is the ratio of concentration or pressure between the results of the reaction / product and the reactant with each reaction coefficient raised
The equilibrium constant is based on the concentration (Kc) in a reaction
pA + qB -----> mC + nD
[tex] \large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}} [/tex]
While the equilibrium constant is based on partial pressure
[tex] \large {\boxed {\bold {Kp ~ = ~ \frac {[pC] ^ m [pD] ^ n} {[pA] ^ p [pB] ^ q}}}} [/tex]
The value of Kp and Kc can be linked to the formula '
[tex] \large {\boxed {\bold {Kp ~ = ~ Kc. (R.T) ^ {\Delta n}}}} [/tex]
R = gas constant = 0.0821 L.atm / mol.K
=n = number of product coefficients-number of reactant coefficients
There are rules in determining the Kp value for the related reaction
1. If the reaction equation is reversed, the value of Kp is also reversed 2. if the reaction coefficient is divided by a factor n, then the new Kp value is the square root of n from the old Kp 3. if the reaction coefficient is multiplied by the factor n, then the new Kp value is the power of n from the old Kp2COF₂ (g) ⇌CO₂(g) + CF₄ (g) Kp = 2.2 × 10⁶ at 298 K(reaction 1)
[tex]\rm COF_2(g)--->\dfrac{1}{2}CO_2(g)+\dfrac{1}{2}CF_4(g) (reaction\:2)[/tex]
For the reaction 2, the reaction coefficient is divided by 2, so the new Kp value :
[tex]\rm Kp=\sqrt{2.2.10^6}\\\\Kp=1.483.10^3[/tex]
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Calculate how many moles of glycine are in a 160.0-g sample of glycine. express your answer using four significant figures.
TO calculate for the number of moles, all we have to do is to take the ratio of mass over molar mass.
Glycine has a molecular formula of C2H5NO2 with a molar mass of 75.07 g/mol.
Therefore:
number of moles = 160 g / (75.07 g / mol)
number of moles = 2.13 moles
What are the respective concentrations (m) of na+ and so42- afforded by dissolving 0.500 mol na2so4 in water and diluting to 1.33 l?
The concentrations of Na+ and SO42- ions after dissolving 0.500 mol Na2SO4 in water and diluting to 1.33 L are respectively 0.752 mol/L and 0.376 mol/L.
Explanation:
The question asks for the calculation of concentrations of Na+ and SO42- ions after dissolving 0.500 mol Na2SO4 in water and diluting to 1.33 L.
For each formula unit of Na2SO4 that dissolves, two Na+ ions and one SO42- ion are produced. Therefore, we expect the concentration of Na+ ions to be twice that of the SO42- ions.
Concentration is calculated using the formula: Concentration = Moles/Volume. By substituting the values, we get: Concentration of Na2SO4= 0.500 mol / 1.33 L = 0.376 mol/L. As previously mentioned, the concentration of Na+ ions is double this, so it is 0.376 x 2 = 0.752 mol/L, while the concentration for SO42- ions remains 0.376 mol/L.
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A typical hydrogen peroxide solution from a drug store is labeled as 3.0% hydrogen peroxide. what is the other 97% of this solution?
When a substance is called to be a solution, this usually means that the majority of it is water and there are some solutes dissolved in it. The solute can be a solid or a liquid.
In this case, the 3% hydrogen peroxide is the solute since it is the lesser amount. So the other 97% is water.
Answer:
Water
A typical hydrogen peroxide solution from a drug store is labeled as 3.0% hydrogen peroxide, the other 97% of the solution is water.
What is hydrogen peroxide?It is a colorless liquid that is bitter. It is an unstable compound and highly reacts with oxygen.
Hydrogen peroxide is usually present with 97% water because its little amount is dangerous.
It is present in a black bottle because it readily reacts with oxygen.
Its uses are cleaning, disinfecting, and removing stains.
Thus, the other 97% of the solution is water.
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Identify the period and group numbers of the element with the electron configuration. [Ne]3s23p4
Considering the definition of peeriod, group and electronic configuration, the period and gruop is 3 and 16 respectively.
The elements are arranged in horizontal rows, called periods, and in columns, called groups.
The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
The placement of the elements in the periodic table is done taking into account the electronic configuration.
In each period, the elements whose last level of their electronic configuration coincides with the number of the period appear.
On the other hand, in each group appear the elements that present the same number of electrons in the last occupied level or valence shell.
In this case, the element has the electron configuration. [Ne]3s²3p⁴
The outermost electrons are at level 3. So the element is in period 3.
You have 6 electrons (2 in the s sublevel and 4 in the p sublevel) in the last level. So the element is in group 16.
Finally, the period and gruop is 3 and 16 respectively.
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Question 3 options:
A.the number of protons plus the number of neutrons in the nucleus
B.the number of neutrons in the nucleus
C.the number of protons in the nucleus
D.the number of electrons outside the nucleus
C. the number of protons in the nucleus
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Why do two isotopes of an element have the same atomic number but different mass numbers?
A homogeneous substance that can be seperated into two or more substances only by a chemical change is an ?
What part of dalton’s atomic theory is disproved by the existence of isotopes?
Ionic compounds molecules have almost strong forces of attraction between neighboring molecules. Which conclusion could be drawn about materials made up of non-polar molecules?
A) These materials would have low densities as solids.
B) These materials would have very high boiling points.
C) These materials will likely be gases at room temperature.
D) These materials will likely be liquids at room temperature.
The correct answer is B) These materials would have high boiling points.
In forming an ionic bond, two ions with opposite charges have to come together due to the attraction of opposite charges. Ionic compounds have have very strong electrostatic forces of attraction between it's ions. Having strong forces of attraction between compounds means that a lot of energy has to be put in to overcome these attractive forces and break the individual ions apart. This is the reason why ionic compounds have higher boiling points.
In light of this information, we can conclude that B is the correct answer.