Isabel wants to determine the mass of a metal block. What is the SI unit for mass

Answer:

The volume occupied by the gas at pressure 970 torr is 91.08 mL.

Explanation:

To calculate the new pressure, we use the equation given by Boyle's law.

This law states that pressure is directly proportional to the volume of the gas at constant temperature.  

The equation given by this law is:

[tex]P_1V_1=P_2V_2[/tex]  (at constant temperature)

where,

[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.

[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.

We are given:

[tex]P_1=930 Torr\\V_1=95 mL\\P_2=970 Torr\\V_2=?[/tex]

Putting values in above equation, we get:

[tex]930 Torr\times 95 mL=270 Torr \times V_2\\\\V_2=\frac{P_1V_1}{P_2}=\frac{930 Torr\times 95 mL}{270 Torr}=91.08 mL[/tex]

The volume occupied by the gas at pressure 970 torr is 91.08 mL.

Answer : The mass of [tex]CO_2[/tex] produced will be, 6.16 grams.

Explanation : Given,

Mass of [tex]CaCO_3[/tex] = 14 g

Mass of [tex]HCl[/tex] = 56.70 g

Molar mass of [tex]CaCO_3[/tex] = 100 g/mole

Molar mass of [tex]HCl[/tex] = 36.5 g/mole

Molar mass of [tex]CO_2[/tex] = 44 g/mole

First we have to calculate the moles of [tex]CaCO_3[/tex] and [tex]HCl[/tex].

[tex]\text{Moles of }CaCO_3=\frac{\text{Mass of }CaCO_3}{\text{Molar mass of }CaCO_3}=\frac{14g}{100g/mole}=0.14moles[/tex]

[tex]\text{Moles of }HCl=\frac{\text{Mass of }HCl}{\text{Molar mass of }HCl}=\frac{56.70g}{36.5g/mole}=1.55moles[/tex]

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

[tex]CaCO_3(s)+2HCl(aq)\rightarrow CO_2(g)+H_2O(l)+CaCl_2(aq)[/tex]

From the balanced reaction we conclude that

As, 1 moles of [tex]CaCO_3[/tex] react with 2 mole of [tex]HCl[/tex]

So, 0.14 moles of [tex]CaCO_3[/tex] react with [tex]0.14\times 2=0.28[/tex] moles of [tex]HCl[/tex]

From this we conclude that, [tex]HCl[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]CaCO_3[/tex] is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of [tex]CO_2[/tex].

As, 1 moles of [tex]CaCO_3[/tex] react to give 1 moles of [tex]CO_2[/tex]

So, 0.14 moles of [tex]CaCO_3[/tex] react to give 0.14 moles of [tex]CO_2[/tex]

Now we have to calculate the mass of [tex]CO_2[/tex].

[tex]\text{Mass of }CO_2=\text{Moles of }CO_2\times \text{Molar mass of }CO_2[/tex]

[tex]\text{Mass of }CO_2=(0.14mole)\times (44g/mole)=6.16g[/tex]

Therefore, the mass of [tex]CO_2[/tex] produced will be, 6.16 grams.

The mass of CO2 produced in the reaction is 5.74 g.

To calculate the mass of CO2 produced in the reaction, we need to determine the change in mass caused by the formation of CO2. We start with the mass of CaCO3 (14.00 g) and the mass of HCl solution (56.70 g). The total mass of the reactants is the sum of these two: 14.00 g + 56.70 g = 70.70 g.

The mass of the resulting solution is 64.96 g, so the change in mass is 70.70 g - 64.96 g = 5.74 g. This change in mass corresponds to the mass of CO2 produced in the reaction, so the mass of CO2 is 5.74 g.

molecular formula is the acutal composition of the components making up the compound

chlorophyll a molecular formula is - C₅₅H₇₂MgN₄O₅

so we have to find how many atoms are in 1 molecule

for this we have to add all the atoms of each element making up this 1 molecule

number of atoms of each element

C - 55

H - 72

Mg - 1

N - 4

O - 5

the sum of all the atoms - 55 + 72 + 1 + 4 + 6 = 138

answer is C ) 138

Final answer:

Several gold atoms are most likely to form a metallic bond since gold is a metal, capable of creating a lattice with a sea of delocalized electrons typical of metallic bonding.

Explanation:

The question revolves around identifying which scenario most likely forms a metallic bond. Metallic bonds are a type of chemical bond found in metal elements where the atoms contribute their valence electrons to form a 'sea of electrons' that are delocalized over all the atoms. This allows for a structure where positive metal ions are immersed in a sea of mobile electrons. Such bonds are typically found in elemental metals or alloys, not compounds with nonmetals like chlorine.

Among the given options, several gold atoms are most likely to form a metallic bond. This is because gold is a metal, and when multiple gold atoms come together, they form a metallic lattice with a sea of delocalized electrons, which is characteristic of metallic bonding. Copper and chlorine, as well as magnesium and chlorine, will more likely form ionic bonds due to the metal reacting with a nonmetal. Chlorine atoms alone form covalent bonds with each other, creating diatomic molecules, not metallic bonds.

Answer:

0

Explanation:

Calcium sulfide has molecular formula CaS. Calcium is a metal of group 2, and sulfur, a nonmetal of group 6, and they form an ionic compound, not a molecule.

So, calcium will give 2 electrons to sulfur, so both of them will have 8 electrons in their valence shell. All these electrons will be in pairs, so there will be 0 lone pairs of electrons.

Each materials have a specific density. In general, the density of liquids are less as compared to the solids whereas the gases are less dense as compared to liquids. Here the density of 'Kr' gas at STP is 3.7386 g / L.

The density is the measurement of how tightly a material is packed together. It can also be defined as the ratio of the mass to the volume. It is a unique property of a particular object. Its SI unit is kg / m³.

The equation used to calculate the density is:

Density = Mass / Volume

Mass of Krypton = 83.798 g

The volume occupied any gas at STP (Standard temperature and pressure) is 22.414 L.

Then the density is:

Density = 83.798 / 22.414

= 3.7386 g / L

Thus the density of krypton gas is 3.7386 g / L.

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Answer:

false i hope this works

Explanation:

It will be nitrogen.

The energy associated with the formation of 1 mol of gaseous cations is The ionization energy. 1 mole of electrons will form 1 mole of gaseous atoms under standard conditions. The ionization energy decreases as you go down a group on the periodic table.

Explanation:

Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

With increase in atomic number there will also occur an increase in atomic size of the atom. As a result, there will be less force of attraction between the nucleus and the valence electrons of the atom.

Hence, it is easy to remove the most loosely bound electron. Therefore, with increase in size there will occur a decrease in the size of atom.

Since, out of the given group 5A elements, arsenic is larger in size and nitrogen is the smallest. Therefore, ionization energy for nitrogen will be the highest.

Thus, we can conclude that nitrogen is the element which has the highest ionization energy.

The nucleus of an atom is the central core and is composed of protons and neutrons.

The nuclei of most atoms usually have more neutrons than protons.

The nuclei are dense, but they are positively charged because of the protons.

the central core and is composed of protons and neutrons

neucleus is positivly charged and protons are either equal or less then nuetrons

If an object is only partially submerged in a fluid, the correct statement is; The volume of the displaced fluid equals the volume of the object. Option A is correct.

This statement is known as Archimedes' principle. According to this principle, when an object is immersed or partially submerged in a fluid, it experiences an upward buoyant force equal to the weight of the fluid it displaces. The volume of the displaced fluid will be equal to the volume of submerged portion of the object.

"The density of the fluid equals the density of the object" is not necessarily true. The density of the fluid and the object can be different, and it does not directly determine the behavior of a partially submerged object.

The density of the fluid is greater than the density of the object" and "The density of the fluid is less than the density of the object" are not universally true statements. The density comparison between the fluid and the object does not determine the behavior of a partially submerged object. It depends on the relative densities and the shape of the object.

Hence, A. is the correct option.

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Answer: 4 people can carry safely for one mission.

Explanation: To calculate the number of moles of [tex]CO_2[/tex] produces by 1 astronaut, we use the formula:

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]    ....(1)

Molar mass of carbon dioxide = 44 g/mol

Given mass of carbon dioxide = [tex]8.8\times 10^2g[/tex]

Putting values in equation 1, we get:

[tex]Moles=\frac{8.8\times 10^2g}{44g/mol}=200moles[/tex]

We are given a chemical equation:

[tex]CO_2+2LiOH\rightarrow Li_2CO_3+H_2O[/tex]

Moles of LiOH by using equation 1, we get:

Molar mass of LiOH = 24 g/mol

[tex]Moles=\frac{3.40\times 10^4g}{24g/mol}=1458.3moles[/tex]

By stoichiometry of the reaction,

2 moles of LiOH produces 1 mole of [tex]CO_2[/tex]

So. 1458.3 moles of LiOH will produce = [tex]\frac{1}{2}\times 1458.3=729.15moles[/tex] of [tex]CO_2[/tex]

Applying Unitary method:

As, 200 moles of [tex]CO_2[/tex] are produced by 1 astronaut

So, 729.15 moles of [tex]CO_2[/tex] will be produced by = [tex]\frac{1}{200}\times 729.15=3.64\approx 4[/tex] astronauts.

Answer:

It will move to the right.

Explanation:

I took the test and wasn't very sure about this answer but I got it right. I also attached a photo down below for proof.

Good luck on your quiz! Have a great day. :)

Final answer:

With a net force of 375 N to the left, the 75-N object will move toward the left, in a straight line, according to Newton's second law of motion.

Explanation:

If the net force on a 75-N object is 375 N from the left, the object will move in the direction of the net force, which is to the left. This is in accordance with Newton's second law of motion, which states that an object will accelerate in the direction of the net external force.

The net force is a vector quantity, meaning it has both a magnitude and a direction. In this case, a net force to the left means that the force vector is pointing to the left, and therefore, the object will move toward the left.

It's important to clarify that the object will move in a straight line towards the left unless acted upon by another force that could change its direction. However, based on the information given, we can conclude that the object will just move toward the left.

In the first voltaic cell, a salt bridge was used for ion flow between CuSO4 and ZnSO4 solutions. The salt bridge ensured electrical neutrality within the circuit and allowed for ion exchange to maintain cell function.

In the first voltaic cell, a salt bridge was used to allow for ion flow between the solutions of CuSO4 and ZnSO4.

The purpose of the salt bridge is not only to maintain electrical neutrality within the internal circuit, but is also to permit the exchange of ions (transfer of charge). Without the salt bridge, the solution would rapidly reach the point where they could no longer release or accept ions, causing the voltaic cell to stop working.

The device, therefore, significantly enhanced the effectiveness and longevity of voltaic cells, playing an integral role in the advancement of electrochemistry.

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Final answer:

When analyzing the reaction A + 3B \(\rightarrow\) 4C with 3.0 moles of A and 6.0 moles of B, B becomes the limiting reactant because it is not present in sufficient quantity to fully react with A, leaving some A unreacted.

Explanation:

Given the equation A + 3B \(\rightarrow\) 4C, we are dealing with a stoichiometry problem where 3.0 moles of A is reacted with 6.0 moles of B. To determine which reactant is leftover, we analyze the stoichiometric relationships. According to the equation, for every mole of A, we need 3 moles of B to completely react. For 3.0 moles of A, 9.0 moles of B would be required. Since only 6.0 moles of B are available, B becomes the limiting reactant. Consequently, some amount of A will not react and will be left over.

Therefore, choice a is incorrect because it misinterprets the stoichiometry required for A. Choice b is incorrect as it confuses the product formation with the reactant consumption. Choice c and choice e are incorrect because B, not having more moles than required, cannot be leftover or support a scenario where neither reactant is leftover. Choice d is the correct choice, as it accurately reflects the stoichiometric relationship that 3 moles of B react with every 1 mole of A, making B the limiting reactant due to its insufficient quantity to react with all of A provided.

Answer:

A. acid

Explanation:

If youve ever heard the term, hydrochlori acid, then you would know it is an acid. Since it has a ph level lower than 7 it is considered an acid, due to the fact that a base woul dbe higher than 7 and neutral would be 7. Hope this helps!

The atomic number and ionic radius increase down Group 2A, while the first ionization energy decreases. These relationships are consistent with periodic trends seen in other groups.

The relationship between atomic numbers and ionic radii in the Group 2A elements, also known as the alkaline earth metals, follows a general trend. As you move from top to bottom within the group, the atomic number increases and so does the ionic radius. This is because the number of energy levels or shells occupied by electrons increases down the group, resulting in larger atomic and ionic radii.

The relationship between atomic numbers and first ionization energies in the Group 2A elements is an inverse relationship. As the atomic number increases from top to bottom within the group, the first ionization energy generally decreases. This is because the increasing number of energy levels provides greater shielding of the outermost electrons from the positively charged nucleus, making it easier to remove an electron and requiring less energy.

These relationships are consistent with the periodic trends observed in other groups of elements as well. In general, atomic and ionic radii increase from top to bottom within a group, and first ionization energies decrease. These trends can be explained by the increasing number of energy levels/shells as you move down a group, which affects the size and attractions between the electrons and nucleus.

Final answer:

When you smell an onion being cut in the kitchen, it is because of a process called diffusion. The molecules of the onion's odor travel through the air and reach your nose, where they bind to olfactory receptors and send signals to your brain. Other substances that can be detected through smell also exhibit this diffusion behavior.

Explanation:

When you walk into your house and smell the onion being cut in the kitchen, you are able to smell it because of a process called diffusion. Diffusion is the net movement of particles from an area of greater concentration to an area of lesser concentration. The particles of the onion's odor travel through the air and reach your nose, where they bind to specialized olfactory receptors in your olfactory epithelium. These receptors send signals to your brain, allowing you to perceive the smell of the onion.

Other substances that exhibit this behavior and can be detected through your sense of smell include various gases, volatile compounds, and particulate matter. For example, the smell of coffee, flowers, or gasoline are all due to molecules in the air that reach your olfactory receptors through diffusion.

Answer:

Two of them Lol

Explanation: