Stars, such as our sun, use fusion to combine hydrogen atoms into helium atoms, and in the process, create energy. As massive stars use the last of their helium fuel, they begin to collapse and temperatures climb high enough to fuse other heavier elements. As elements increase in atomic number, the amount of energy required for fusion to occur also increases. Nickel represents the heaviest element that can be produced by fusion due to to the net energy requirements. Two atoms of ___________ could combine by fusion in order to create nickel.
A) hydrogen
B) nitrogen
C) oxygen
D) silicon

Scientists use the emission spectra of elements to detect
A) explosives in luggage.
B) cracks in support structures, like bridges.
C) the possibility of an earthquake occurrence.
D) elements in clouds of gas and dust in deep space

Vanadium has two naturally occuring isotopes - vanadium-50 and vanadium-51. Predict the isotopic mass of vanadium-50 given that vanadium-50 has an abundance of 0.250% and that vanadium-51 has an abundance of 99.750% and a mass of 50.944 amu.
A) 49.944 amu
B) 62.558 amu
C) 63.303 amu
D) 5094.151 amu

1)

[tex]1.2 \; \text{g}[/tex]

There are [tex]75000/24000 = 25/8 = 3.125[/tex] half lives in a period of 75,000 years. The sample of plutonium-239 would thus expect a loss in mass that would results in a mass ratio of [tex](1/2)^{25/8}[/tex] which is the same as [tex]2^{-25/8} \approx 0.12 [/tex] relative to the initial mass. [tex]0.12 \times 10 \; \text{g} = 1.2 \; \text{g}[/tex] of plutonium-239 would thus remain in the initial [tex]10 \; \text{g}[/tex] sample after 75,000 years.

2)

[tex]1.5 \times 10^{3} \; \text{g}[/tex]

There are [tex]160/30 = 16/3 \approx 5.3[/tex] half lives in 160 years.

[tex]\text{mass remaining in 160 years} / \text{initial mass} = (1/2)^{160/30} \approx 2.5 \times 10^{-2}[/tex]

Thus

[tex]\text{initial mass} = 37 \; \text{g} / (2.5 \times 10^{-2})= {\text{initial mass} } \approx 1.5 \times 10^{3} \; \text{g}[/tex]

Hey there!

Molar mass C2H6O = 46.0684 g/mol

Number of moles:

n = mass of solute / molar mass

n = 70.6 / 46.0684

n = 1.532 moles

Therefore:

M = number of moles / volume ( L )

M = 1.532 / 2.25

= 0.680 M

Hope that helps!

The molarity of a solution containing 70.6 g of C2H6O in 2.25 L of solution is calculated by determining the number of moles of C2H6O and dividing by the volume in liters, resulting in a molarity of 0.6818 M.

The molarity of a solution is calculated by dividing the number of moles of solute by the volume of the solution in liters. First, you need to find the molar mass of C2H6O, which is (2 × 12.01) + (6 × 1.008) + (1 × 16.00) = 46.07 g/mol. Next, calculate the number of moles of C2H6O in 70.6 g by using the molar mass:

Then, divide the number of moles by the volume of the solution in liters to find the molarity:

Therefore, the molarity of the solution is 0.6818 M.

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Answer: 35.72 % of Barium ions will be present in the original unknown compound.

Explanation: The reaction of Barium ions and sodium sulfate is:

[tex]Na_2SO_4(aq.)+Ba^{2+}(aq.)\rightarrow BaSO_4(s)+2Na^+(aq.)[/tex]

Here, Sodium sulfate is present in excess, Barium ions are the limiting reagent because it limits the formation of product.

Now, 1 mole of barium sulfate is produced by 1 mole of Barium ions.

Molar mass of Barium sulfate = 233.38 g/mol

Molar mass of Barium ions = 137.327 g/mol

233.38 g/mol of barium sulfate will be produced by 137.323 g/mol of Barium ions, so

0.4105 grams of barium sulfate will be produced by = [tex]\frac{137.327g/mol}{233.38g/mol}\times 0.4105g[/tex] of Barium ions

Mass of barium ions = 0.2415 grams

To calculate percentage by mass, we use the formula:

[tex]\% mass=\frac{\text{Mass of solute (in grams)}}{\text{Total mass of the solution(in grams)}}\times 100[/tex]

Mass of the solution = 0.6760 grams

Putting the value in above equation, we get

[tex]\% \text{ mass of }Ba^{2+}\text{ ions}=\frac{0.2415g}{0.6760g}\times 100[/tex]

% mass of Barium ions = 35.72%.

The percentage by mass of barium ion (Ba²⁺) in the unknown compound is 35.7%

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

Ba²⁺(aq) + Na₂SO₄(aq) —> BaSO₄(s) + 2Na⁺(aq)

Molar mass of Ba²⁺ = 137 g/mol

Mass of Ba²⁺ from the balanced equation = 1 × 137 = 137 g

Molar mass of BaSO₄ = 137 + 32 + (16×4)

= 233 g/mol

Mass of BaSO₄ from the balanced equation = 1 × 233 = 233 g

Thus,

From the balanced equation above,

137 g of Ba²⁺ reacted to produce 233 g of BaSO₄.

Next, we shall determine the mass of Ba²⁺ that reacted to produce 0.4105 g of BaSO₄. This can be obtained as follow:

From the balanced equation above,

137 g of Ba²⁺ reacted to produce 233 g of BaSO₄.

Therefore,

X g of Ba²⁺ will react to produce 0.4105 g of BaSO₄ i.e

X g of Ba²⁺ = [tex]\frac{137 * 0.4105}{233} \\\\[/tex]

X g of Ba²⁺ = 0.2414 g

Finally, we shall determine the percentage of Ba²⁺ in the unknown compound. This can be obtained as follow:

Mass of Ba²⁺ = 0.2414 g

Mass of compound = 0.6760 g

[tex]Percentage = \frac{mass of ion}{mass of compound} * 100\\\\= \frac{0.2414}{0.6760} * 100\\\\[/tex]

Therefore, the percentage by mass of barium ion (Ba²⁺) in the unknown compound is 35.7%

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Answer:

Metal: iron, silver, or gold. Made with metallic bonds. Is a Metallic solid.

Nonmetal: diamond. Made with covalent bonds. Is a Network Solid.

Metallic solids are formed by metal atoms through metallic bonding. Nonmetallic solids can be classified as ionic, covalent network, or molecular depending on the type of bond between nonmetal atoms.

There are two main types of crystalline solids formed from different structural units.

i. Metal atoms: Metallic solids are formed by metal atoms, which are held together by metallic bonding. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a 'sea' of delocalized electrons. Examples of metallic solids include crystals of copper, aluminum, and iron.

ii. Nonmetal atoms: Nonmetallic solids can be classified into different types, such as ionic solids, covalent network solids, and molecular solids. The specific way in which nonmetal atoms form a crystalline solid depends on the type of bond between the atoms. For example, in ionic solids, nonmetal atoms are held together by ionic bonds, while in covalent network solids, nonmetal atoms are linked by covalent bonds.

Answer: A) Taxonomy

Taxonomy is the science of naming groups of living organism based on common characteristics

The answer is A.

Taxonomy is the science of naming living things according to common characteristics.It is also the science of grouping organisms according to their characteristics and evolutionary history.

Yes- as long as the roller coaster car is not powered once it leaves the station and energy loss due to resistance can be ignored.

Energies of a system:

A roller coaster car moving along a level track with an initial velocity has mechanical energy in the form of kinetic energy.

The car would slow down while gaining height as its kinetic energy converts to gravitational potential energy when moving upwards along the track. It would have no kinetic energy since all its mechanical energy are now in the form of gravitational potential energy in case it comes to a stop before reaching the top of the track.

Similarly, the car gains speed while losing height as some of its gravitational energy is converted to kinetic energy when it travels downwards.

The mechanical energy of this vehicle conserves since any of the movements, moving upslope, downslope, or level, would ensure that

Loss in Potential Energy = Gain in Kinetic Energy

and vice versa.

Final answer:

Energy is conserved in a roller coaster system when ignoring friction and air resistance. The total mechanical energy remains constant as potential energy is converted to kinetic energy and vice versa throughout the ride.

Explanation:

Yes, energy is conserved in the system of a roller coaster car moving along a track, provided that we neglect any losses due to friction or air resistance. According to the law of conservation of energy, the total mechanical energy of a closed system remains constant. This is represented by the equation E = T + U, where E stands for the total mechanical energy, T is the kinetic energy, and U is the potential energy.

At the top of the first hill, the roller coaster car has its maximum potential energy, which is then converted to kinetic energy as it descends. The conversions between potential and kinetic energy continue throughout the ride, with energy transitioning as the car goes up and down the track. At the bottom of each descent, the car reaches its maximum kinetic energy, which becomes potential energy again as the car rises.

The total mechanical energy at any point in the ride should be the same as it was at the start of the coaster's trip, assuming no energy is lost. Remember that both kinetic and potential energies are forms of mechanical energy and are measured in joules, indicating the capacity for doing work.

Hey there!:

HA <=> H⁺ + A⁻

pH = -log[H+] = 6

[ H⁺ ] = 10^-pH

[ H⁺] = 10 ^ -6

[ H⁺ ] = 0.000001 M

Percent dissociation:

[ H⁺ ] / [ HA]o * 100

[ 0.000001 / 0.10 ] * 100

0.00001 * 100 => 0.0010%

Answer  D

Hope that helps!

Answer:

1. A) Atoms gain valence electrons to form anions.

2. D) 50.94151 amu

3. D) elements in clouds of gas and dust in deep space.

4. D) silicon

Explanation:

Hello,

1. In this question, we consider that anions are chemical ions negatively charged, it means that they gain valence electrons to increase their oxidation states, thus the answer is: A) Atoms gain valence electrons to form anions.

2. In order to compute the required average atomic mass, we must consider the mass of each isotope and its percentage as shown below:

[tex]M=50amu*0.0025+50.944amu*0.9975\\M=50.94151amu[/tex]

Therefore answer is D).

3. In this case, the answer is: D) elements in clouds of gas and dust in deep space, as each element has its own atomic emission spectrum, therefore one can identify the spectra in order to determine which elements are present.

4. Since helium is obtained via the atomic fusion of two hydrogen atoms, nickel can be obtained via the atomic fusion of two silicon atoms since each silicon has 14 protons and electrons, thus, if we fusion them we obtain 28 protons and electrons, validating the existence of a nickel atom.

Best regards.

Given information:

Concentration of NaF = 0.10 M

Ka of HF = 6.8*10⁻⁴

To determine:

pH of 0.1 M NaF

Explanation:

NaF (aq) ↔ Na+ (aq) + F-(aq)

[Na+] = [F-] = 0.10 M

F- will then react with water in the solution as follows:

F- + H2O ↔ HF + OH-

Kb = [OH-][HF]/[F-]

Kw/Ka = [OH-][HF]/[F-]

At equilibrium: [OH-]=[HF] = x and [F-] = 0.1 - x

10⁻¹⁴/6.8*10⁻⁴ = x²/0.1-x

x = [OH-] = 1.21*10⁻⁶ M

pOH = -log[OH-] = -log[1.21*10⁻⁶] = 5.92

pH = 14 - pOH = 14-5.92 = 8.08

Ans: (b)

pH of 0.10 M NaF is 8.08

Hey There!

ideal gas law  :

PV = nRT

P = nRT/V

P = (1*0.082)(18+273)/(0.5) = 47.724 atm

For VDW :

(P + a(n/V)²)(V - nB) = nRT

P = nRT/(V - nB) - a(n/V)²

P = 1*0.082*(18+273)  / (0.5-1*0.03219) - 1.345*( 1/0.5 )² = 45.62

P = 45.62 atm

Pdif = P2-P1 = 47.724 - 45.62 = 2.104 atm

Final answer:

The difference between the ideal pressure and the real pressure of argon in the given conditions is found by using both the ideal gas law and the van der Waals equation, then subtracting the ideal pressure from the real pressure.

Explanation:

When comparing the ideal gas law with the van der Waals equation, we are looking at two different models for describing the behavior of gases. The ideal gas law assumes that gas particles do not interact and have no volume, while the van der Waals equation accounts for the finite volume of gas particles and the attractive forces between them, which can cause deviations from ideal behavior at high pressures and low volumes or high temperatures.

To find the ideal pressure, use the ideal gas law PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/(K·mol)), and T is the temperature in Kelvin. Substituting the values into this equation, we can calculate the ideal pressure for argon.

The real pressure of argon can be estimated using the van der Waals equation, which is given by (P + n²a/V²)(V - nb) = nRT, with a and b being the van der Waals constants for argon. Subtracting the ideal pressure from the real pressure will give us the difference between the two.

Maple syrup is dark in colour.

Natural pH indicators like turmeric or morning glories generally change in colour and indicate the pH of any solution

The pH change is due to high hydronium ion concentration of hydroxide ion concentration.

The pH change is indicated by change in colour by natural indicators which is possible to be observed if we have some light coloured sample / transparent sample to be tested.

In case of maple syrup the colour is so dark  that it becomes difficult to observe the colour change in any natural indicator

I agree with what you've chosen for question two and three.

I would choose C for the fourth question and argue that you shall also go with C for question five.

One of the main ideas about repetition is to have multiple Trials- or independent experiments- for a single independent variable using identical experimental setup. The table presented in option C is the only one among the four choices that allots spaces for measurements from multiple independent experiments.

Hypotheses are predictions of the outcome of a particular experiment. A hypothesis is correct only if it accurately describes the outcome of an experiment. The hypothesis, not the data, would have to be revised if the two doesn't fit. The researcher could keep developing and testing new hypotheses until arriving at a correct one.

Additionally, I would prefer option B over option D in the first question- responses to that question can depends on what your teacher says about the validity of different sources, given that neither B nor D are reliable as sources that one would like to cite in a paper.

1. The position of equilibrium would shift to the left, making more reactants.

Cl₂(g) + I₂(g) + heat ⇌ 2ICl(g)

Le Châtelier’s Principle states that, if you add a stress to a system at equilibrium, the system will respond in a direction that will remove the stress.

Here, the stress is the removal of Cl₂. The system will respond by generating more Cl₂ to replace what was removed.

The position of equilibriumwill move to the left.

Removing Cl2(g) from the system would cause the equilibrium to shift to the left according to Le Chatelier's principle, resulting in the production of more reactants.

Removing Cl2(g) from the reaction Cl2(g) + I2(g) <=> 2 ICl(g), which is endothermic, would cause the equilibrium position to shift to the left. This is because according to Le Chatelier's principle, when a reactant is removed, the equilibrium shifts in the direction that replaces the removed substance, in this case, to the left to replenish the lost Cl2(g).

When considering the endothermic reaction Cl2(g) + I2(g) <=> 2 ICl(g), and analyzing the effect of removing Cl2(g) from the system, we apply Le Chatelier's principle. This principle states that if a change is imposed on a system at equilibrium, the system will adjust to counteract that change. In this case, removing Cl2(g) will result in the system shifting to the left to produce more reactants and re-establish equilibrium. Therefore, the correct answer is (1) the reaction would go to the left, making more "reactants".

Answer:-  168 moles of water are formed.

Solution:- The balanced equation for the formation of water from hydrogen and oxygen gases is:

[tex]2H_2(g)+O_2(g)\rightarrow 2H_2O(l)[/tex]

From this equation hydrogen and oxygen react in 2:1 mol ratio.

We have been given with 178 moles of hydrogen and 84 moles of oxygen. We need to figure out the limiting reactant first. For this let's either calculate the moles of oxygen required to react completely with 178 moles of hydrogen or the moles of hydrogen required to react completely with 84 moles of oxygen.

Let's say we calculate the moles of oxygen required to react completely with 178 moles of hydrogen:

[tex]178molH_2(\frac{1molO_2}{2molH_2})[/tex]

= [tex]89molO_2[/tex]

From the above calculations, 89 moles of oxygen are required to react completely with 178 moles of hydrogen but only 84 moles of oxygen are available, It means oxygen is the limiting reactant and the product yield depends on it.

There is 1:2 mol ratio between oxygen and water. Let's calculate the moles of water for given 84 moles of oxygen:

[tex]84molO_2(\frac{2molH_2O}{1molO_2})[/tex]

= [tex]168molH_2O[/tex]

So, the reaction of 178 moles of hydrogen and 84 moles of oxygen gives 168 moles of water.

Final answer:

To determine the number of moles of water that can be formed from 178 mol of hydrogen gas and 84 mol of oxygen gas, the balanced chemical equation 2 H₂ + O₂ → 2 H₂O is used. Oxygen is the limiting reactant with only 84 mol available, resulting in the production of 168 moles of water.

Explanation:

To find the number of moles of water that can be formed from 178 mol of hydrogen gas (H₂) and 84 mol of oxygen gas (O₂), we need to use the balanced chemical equation for the formation of water:

2 H₂(g) + O₂(g) → 2 H₂O(g)

According to this equation, 2 moles of H₂ react with 1 mole of O₂ to produce 2 moles of H₂O. The limiting reactant is the one that will run out first and determine the amount of the product formed. With 178 mol of hydrogen available, we would need 89 mol of oxygen to fully react with all the hydrogen (since the ratio is 2:1). However, since we only have 84 mol of oxygen, oxygen is the limiting reactant.

We can calculate the moles of water produced as follows:

84 mol O₂ (2 mol H₂O / 1 mol O₂) = 168 mol H₂O

Therefore, 168 moles of water can be formed from 178 mol of hydrogen gas and 84 mol of oxygen gas.

Answer:

1 = strontium

2 = technetium

3 = silver

Explanation:

Strontium is present in 2 group of periodic table. It is alkaline earth metal. It is most reactive element and can not found free in nature. it  is insoluble in water but react with water and form strontium hydroxide and hydrogen gas is also produced. It is radioactive element.

It is similar to the calcium and can incorporated into bones. The food rich with strontium is used to avoid the osteoporosis. It is found in leafy vegetables, grains, sea foods etc.

In given series strontium is highest in reactivity then technetium, while the technetium is more reactive than silver. The silver is less reactive as compared to both given elements.

Answer:

1. Strontium 2. Technetium 3. Silver

Explanation:

Spoiling food is a chemical change.

Spoiling food is a chemical change and the composition of the substance does changes to form new substances.

In a physical change, the composition of the substance does not change. For example, if you cut an apple in half, the apple will change shape, but the molecules that make up the apple will still be the same.

In a chemical change, the composition of the substance does change. For example, when food spoils, the food molecules react with each other to form new substances with different properties. These new substances may have a differe6t color, smell, or taste than the original food. They may also be harmful to eat.

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[tex]\Delta E = 808 \; \text{kJ} \cdot \text{mol}^{-1}[/tex]

Forming chemical bonds releases energy whereas breaking them requires an input of energy.

Typical chemical reaction involves breaking preexisting bonds and forming new ones. The amount of energy absorbed in the first process is not necessarily equal to the energy released in the second. Depending on the relationship between the two energies, their difference is either released or absorbed in the chemical reaction.

Start by identifying bonds broken and formed in this chemical process:

[tex]\phantom{\text{H}-}\;\;\text{H}\\\phantom{\text{H}-}\;\;\;|\\\text{H}-\text{C}-\text{H} + 2 \; \text{O}-\text{O} \to \text{O}=\text{C}=\text{O} + 2\; \text{H}-\text{O}-\text{H}\\\phantom{\text{H}-}\;\;\;|\\\phantom{\text{H}-}\;\;\text{H}[/tex]

Bonds Broken per reaction:

Bonds Formed per reaction:

[tex]\text{Energy Change} = \text{Energy Released} - \text{Energy Absorbed}\\\phantom{\text{Energy Change}} = E[\text{Bonds Formed}] - E[\text{Bonds Broken}][/tex]

Referring to a thermodynamic data table of bond energies,

Note that due to the conservation of energy, the energy required to break a chemical bond shall be the same as the energy released on its formation.

[tex]\text{Energy Change} =(2 \times 804 + 4 \times 463) - (4 \times 414 + 2 \times 498)\\\phantom{\text{Energy Change}} =3460 - 2652\\\phantom{\text{Energy Change}} = 808 \; \text{kJ} \cdot \text{mol}^{-1}[/tex]

3460 kJ, the energy released in the formation of bonds is greater than 2652 kJ, the energy absorbed to break bonds in the reactant. The energy change is thus positive and 808 kJ of energy is released per mole reaction.

Answer:

Explanation:

Billiard Ball Model is the name used for the model of the atom proposed by John Dalton (1766 - 1844)

The use of this name is to refer the fact that the atom was depicted as a tiny solid and indivisible particles.

Dalton's conclusions about the structue of the atom and the matter were:

Answer:

A. The Substance Loses or Gains Heat

Explanation:

Plato 5/5

The metals are elements which have low ionization potential and can lose electrons easily

the other physical characteristics associated with them and hence with Aluminium are

a) they can conduct electricity in molten state, hence It would only conduct electricity if it were melted.

b) It could be stretched into a thin wire. It means it is ductile.

In case of given aluminium metal the correct answer is

it could be stretched to thin wire

(E) It could be stretched into a thin wire.

- Aluminum is a ductile metal, meaning it can be stretched into thin wires without breaking.

- Let's analyze each option to see why (E) is the most reasonable assumption:

 - (A) Aluminum conducts electricity well even in its solid state, not just when melted, so this assumption is not accurate.

 - (B) Aluminum has a high melting point (660.32°C or 1220.58°F), much higher than typical campfire temperatures, so it would not melt or boil if thrown into a campfire.

 - (C) Aluminum is malleable and ductile, meaning it can be hammered into different shapes without breaking easily.

 - (D) Aluminum can maintain its shape under normal conditions, but it can be reshaped.

 - (E) Aluminum is known for its ability to be drawn into thin wires, which is a characteristic of ductile metals.

Therefore, option (E) is the most reasonable assumption about aluminum metal among the given choices.

Compounds with 2 ions bonded are called ionic compounds.

They are held together by the attractions between the positive and negative ions.

Mixtures of gases such as argon and helium are more likely to form an ideal solution because they experience insignificant intermolecular interactions, making their mixture thermally neutral with an increase in entropy. Option C is correct.

The intermolecular forces in ideal gases are considered to be nonexistent, and gases behave more ideally than solids or liquids. In an ideal solution, gases mix without any energy change due to similar intermolecular forces of attraction between the mixed gases as those present in the separated components.

This process is thermally neutral, and the formation of the gas solution results in increased disorder, or entropy, as gases like helium and argon will spread out and occupy a larger volume when mixed.

Hence, C. is the correct option.

Meteorology is the study of the atmosphere and atmospheric phenomena, focusing on predicting the weather in the short term to protect lives and property. This scientific field uses various data and modeling techniques to forecast weather patterns and is closely related to climatology and atmospheric science.

Meteorology is defined as the study of the atmosphere and the various phenomena within it, including the processes that cause weather conditions. Specifically, meteorologists analyze the movement of air masses, cloud formation, and precipitation, all of which play a central role in shaping our day-to-day weather.

The goal of meteorology is not only to understand these atmospheric processes but also to predict weather patterns and changes. This predictive ability is crucial for safeguarding lives, property, and economic activities that may be affected by weather events. Meteorology utilizes data from air pressure and temperature measurements, among others, and employs modeling techniques to produce weather forecasts.

It is a discipline that significantly overlaps with other branches of atmospheric science, such as climatology and atmospheric chemistry. While climatology focuses on longer-term weather patterns and trends over decades or even centuries, meteorology primarily deals with the short-term prediction of weather. These weather predictions, enabled by the advances in measurement and analysis technologies such as radars and satellites, play a vital role in daily life and in preparing for extreme weather events.

Answer:

C. transition metals

Explanation:

Answer:

c

Explanation:

i did it on usatp

1. 17.2kg=17200g

so knowing that d=m/V, use V=m/d to calculate the volume

v=17200/5.75

and then devide by 1000 to convert cm3 to dm3 and the answer will be in dm3

2. d=m/v

v=0.5l

m=425g

so use the formula and you will get d=425/0.5=850g/l

3. use d=m/v again, but not before rewriting the formula for volume: m=vd and  convert dm3 to cm3

1dm3=1000cm3

so 0.987dm3 =987 cm3

now m=987cm3 * 10.5g/cm3 and the answer will be in grams

The volume occupied by 17.2 kg of tin is 2.99 cubic decimeters.

The density of olive oil is 0.850 g/mL.

The mass of 0.987 cubic decimeters of silver is 10,365.5 grams.

Explanation:

Given:

To find:

Solution:

1.

The mass of tin = m = 17.2 kg

[tex]1 kg = 1000 g\\m=17.2 kg=17.2\times 1000 g=17,200 g[/tex]

The volume of tin = v

The density of tin = d = [tex]5.75 g/cm^3[/tex]

[tex]d=\frac{m}{v}\\\\5.75g/cm^3=\frac{17,200 g}{v}\\\\v=\frac{17,200 g}{5.75g/cm^3}=2,991.3 cm^3\\\\1 cm^3= 0.001 dm^3\\\\v=2,991.3 cm^3=2,991.3\times 0.001 dm^3\\\\=2.9913 dm^3\approx 2.99 dm^3[/tex]

The volume occupied by 17.2 kg of tin is 2.99 cubic decimeters.

2.

The mass of an olive oil = m = 425 g

The volume of an olive oil = v = 500 mL

The density of an olive oil =d

[tex]d=\frac{m}{v}\\=\frac{425 g}{500 mL}=0.850 g/mL[/tex]

The density of olive oil is 0.850 g/mL.

3.

The mass of silver = m =

The volume of silver = v = [tex]0.987 dm^3[/tex]

[tex]1 dm^3=1000 cm^3\\v=0.987 cm^3=0.987\times 1000=987 cm^3[/tex]

The density of silver = d =[tex]10.5 g/cm^3[/tex]

[tex]d=\frac{m}{v}\\\\10.5 g/cm^3=\frac{m}{987 cm^3}\\\\m=10.5 g/cm^3\times 987 cm^3=10,365.5 g[/tex]

The mass of 0.987 cubic decimeters of silver is 10,365.5 grams.

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Hey there!:

K = Ka * Kb / Kw

Ka = 1.8*10⁻⁴

Kb = 10⁻¹⁴ / 6.8*10⁻⁴

K =  1.8*10⁻⁴ * ( 10⁻¹⁴/ 6.8*10⁻⁴ ) * ( 1 / 10⁻¹⁴ )

K =  = 1.8 / 6.8

K = 0.265

Answer A

Therefore:

K is less than on the forward reaction is not favorable .

Hope That helps!

1. The answer is E.

2. I agree with your answers.

3. I also agree with your answers

Left Frame

The answer you have chosen is not correct. You have selected a physical property. Color is something that will not change as long as nothing chemical is done to the sample. If it is just going to sit there at room temperature in a flask and be admired, (particularly if the flask has a cork in it), then whatever you see is a physical property. The only one that isn't is E. When you burn something, there is a change. One chemical turns into something else. If you burn gasoline (for your car) then C8H18 + 13.5 02 ==> 8CO2 +  9H20 is the result.  That gasoline is not easily reversible. It has changed into something else (Water and Carbon Dioxide). That's Chemical.

Middle Frame

I've never encountered these terms before. Your two examples of extensive are correct. I'm not sure about the chemical reaction. I think it is intensive, but I wouldn't bet the farm on it. A chemical reaction is going to take place no matter how much is used. You could have too much sample or too much acid, but what happens does not depend on the amount. I think you are correct.

Answer: you have placed these in the right place.

Right frame.

All four are in the right category. Very nicely done.

Hey there!:

C6H12O6 + C6H12O6 ----> H2O + C12H22O11

it is a dehydration synthesis reaction, because H2O is released and C12H22O11  is formed .

Answer A

Hope  that helps!

The process of dehydration synthesis combines two smaller molecules into a larger one, eliminating a molecule of water. In this case, two glucose molecules combine to create one sucrose molecule and water, thus the correct answer is A) H2O + C12H22O11.

In the process of dehydration synthesis, two smaller molecules combine to create a larger molecule by eliminating one molecule of water. In the reaction given, two molecules of glucose (C6H12O6) undergo dehydration synthesis to produce a molecule of sucrose (C12H22O11) and water (H2O). Therefore, the correct answer for the missing molecules is A) H2O + C12H22O11.

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C) [tex]\text{HCl}[/tex] hydrochloric acid and, in case that the question allows for more than one choices, D) [tex]\text{CO}_2[/tex] carbon dioxide as well.

Methane molecules [tex]\text{CH}_4[/tex] are nonpolar and barely dissolve in water.

Sodium hydrocarbonate [tex]\text{Na}\text{HCO}_3[/tex] undergoes hydrolysis to release hydroxide ions [tex]\text{OH}^{-}[/tex] that can end up consuming [tex]\text{H}^{+} \; (aq)[/tex]:

[tex]\text{NaHCO}_3 \; (aq) \to \text{Na}^{+} \; (aq) + \text{HCO}_3^{-} \; (aq)\\\text{HCO}_3^{-} \; (aq) + \text{H}_2\text{O} \; (l) \leftrightharpoons \text{H}_2\text{CO}_3\; (aq) + \text{OH}^{-} \; (aq)[/tex]

Hydrochloric acid, a strong acid, ionizes to produce protons [tex]\text{H}^{+} \; (aq)[/tex] and chloride ions when dissolved in water:

[tex]\text{HCl}\; (aq) \to \text{H}^{+} \; (aq) + \text{Cl}^{-} \; (aq)[/tex]

Carbon dioxide reacts with water to produce hydrocarbonic acid, a weak acid that slightly ionizes, also producing protons [tex]\text{H}^{+} \; (aq)[/tex] but to a significantly lesser extent than hydrochloric acid does.

[tex]\text{CO}_2\; (g) + \text{H}_2\text{O} \; (l) \leftrightharpoons \text{H}_2\text{CO}_3\; (aq)\\\text{H}_2\text{CO}_3\; (aq) \leftrightharpoons \text{H}^{+}\; (aq) + \text{HCO}_3^{-} \; (aq)[/tex]

D) Co2!

it reacts with water to form carbonic acid...

that has H+ ions!

Answer:

the sum of the masses of protons and neutrons is 20.1797

Explanation:

The sum of the masses of protons and neutrons is 20.1797. The Option C.

The total mass of protons and neutrons in an atom, known as the atomic mass or mass number can be determined by adding the individual masses of protons and neutrons.

In the given representation, the value "20.1797" likely represents the atomic mass of the element, which includes both protons and neutrons. This value corresponds to the sum of the masses of all the particles in the nucleus of the atom.

Read more about masses

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