A student wants to do scientific research on how aquatic plants in lakes have changed over time. What field of science does this research mostly involve?

Answer: m = 471 g CaCO3

Explanation: From the balanced equation, convert the moles of Na2CO3 to moles of CaCO3 using the mole ratio from the equation. Then convert miles of CaCO3 to mass using the molar mass of CaCO3.

Solution attached.

Rounding to an appropriate number of significant figures, the mass of calcium carbonate produced from 4.71 moles of sodium carbonate is approximately 471.2 grams.

To find the mass of calcium carbonate (CaCO₃) produced from 4.71 moles of sodium carbonate (Na₂CO₃), we need to use stoichiometry and the balanced chemical equation provided.

From the balanced chemical equation:

1 mole of Na₂CO₃ produces 1 mole of CaCO₃.

Therefore, to find the moles of CaCO₃ produced, we simply use the stoichiometric ratio:

Moles of CaCO₃ = 4.71 moles of Na₂CO₃

Now, we need to find the molar mass of CaCO₃ to convert moles to grams. The molar mass of CaCO₃ is:

Molar mass of CaCO₃ = (1 × atomic mass of Ca) + (1 × atomic mass of C) + (3 × atomic mass of O)

Molar mass of CaCO₃= (1 × 40.08 g/mol) + (1 × 12.01 g/mol) + (3 × 16.00 g/mol)

Molar mass of CaCO₃ = 40.08 g/mol + 12.01 g/mol + 48.00 g/mol

Molar mass of CaCO₃ = 100.09 g/mol

Now, we can calculate the mass of CaCO₃ produced:

Mass of CaCO₃ = Moles of CaCO₃ × Molar mass of CaCO₃

Mass of CaCO₃ = 4.71 moles × 100.09 g/mol

Mass of CaCO₃= 471.2439 g

Rounding to an appropriate number of significant figures, the mass of calcium carbonate produced from 4.71 moles of sodium carbonate is approximately 471.2 grams.

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Answer:

Density = Mass / Volume.   so,  x = 90.5 g / 96 mL ... The Density would be 0.942 g/mL

The density of 96 ml of a liquid that has a mass of 90.5 g is 0.942 g/mL.

The density of a material is the measure of how tightly it is packed together. It is expressed as mass per unit volume. Density Formula: = m/V, where is the density, m is the object's mass, and V is its volume.

A dense object is heavier than a less dense object of the same size. An object with a density less than that of water will float on it, while one with a higher density will sink. The density equation is D = M / V, which stands for density equals mass per unit volume.

Given:

Density = ?

Volume = 96 ml

Mass = 90.5 g

Density = Mass / Volume  

Therefore,  

x = 90.5 g / 96 mL

= 0.942 g/mL

Thus, The Density would be 0.942 g/mL

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Acceleration of the object is 8.75 m/s² and average velocity is 32.5 m/s

Explanation:

Acceleration of the object = Change in velocity/Time

                                            = 50 - 15/4 = 35/4 = 8.75 m/s²

                                     = 15 + 50/2 = 65/2 = 32.5 m/s

The acceleration of the object is 8.75 m/s², and assuming constant acceleration, the average velocity is 32.5 m/s.

To calculate the acceleration of an object when the velocity changes from 15 m/s to 50 m/s over a time interval of 4 s, we can use the formula for acceleration (a), where acceleration equals the change in velocity (Δv) divided by the change in time (Δt):

a = Δv / Δt

The change in velocity is the final velocity minus the initial velocity. Thus, Δv = 50 m/s - 15 m/s = 35 m/s. The time interval is Δt = 4 s.

a = 35 m/s / 4 s = 8.75 m/s²

The average velocity during this interval can be calculated by taking the sum of the initial and final velocities and dividing by two, assuming the acceleration is constant. Therefore, the average velocity (vavg) is:

vavg = (initial velocity + final velocity) / 2

vavg = (15 m/s + 50 m/s) / 2 = 32.5 m/s

Answer: Convection

Explanation: It is a form of heat transfer occuring only on fluids such liquids and gases. In convection when fluids gains heat they become less dense and rises which implies that warmer air rises and cooler air sinks.

Answer:

D to absorbe energy from the sun's radiation to heat wats

Final answer:

Solar panels can utilize photovoltaics to generate electricity directly, or solar thermal technology to heat water in a house, with option D being the correct usage in the context of heating water.

Explanation:

Solar panels in a house can be used in various ways to harness solar energy. One of the methods is through photovoltaics, which convert sunlight directly into electricity that can be used to power a home's appliances and lighting. Another method is solar thermal technology, which can absorb the Sun’s energy to heat water or air for domestic use. For the question at hand, the correct answer is option D: to absorb energy from the sun’s radiation to heat water. Solar panels absorb electromagnetic waves, particularly visible light and infrared radiation, which is then converted into thermal energy. This thermal energy can be used to heat water in a residential setting, contributing to the home's hot water supply or heating system, and reducing reliance on conventional energy sources.

At high temperature the gas would diffuse out as the pressure increases and at extremely low temperature the solid becomes compact.

Explanation:

The states of matter largely depends on the temperature. Any substance when crosses the threshold temperature its phase changes.

When temperature is low the motion of molecules is also low and internal energy also gets low. Solid have tendency of settling in low energy level and have highly compact molecules. At low temperature the solid would compress as molecules would be highly condensed.

Gas in the nature has its molecules quite far apart in matter. According to Kinetic theory of gases the increase in temperature causes rapid collisions of the gas molecule as the kinetic energy of molecules increases. The greater force of collision would cause increase in pressure of the container and increased diffusion rate.

Final answer:

Solids remain solid but with reduced molecular vibration at extremely cold temperatures, and gases at extremely hot temperatures can expand, increase in pressure, or even form a plasma by breaking chemical bonds.

Explanation:

When a solid is exposed to extremely cold temperatures, it will remain solid because solids are the most stable state of matter at low temperatures. However, the kinetic energy of the molecules within the solid decreases further, which means the molecules vibrate less. In some cases, if the solid is cooled to near absolute zero, it is theorized that molecular movement would cease entirely, and the traditional differences between solids, liquids, and gases would no longer be apparent.

Conversely, when a gas is exposed to extremely hot temperatures, its molecules move more rapidly due to increased kinetic energy, impacting each other and the container with greater force. This can cause the gas to expand or increase in pressure. If the temperature is high enough to break chemical bonds within the molecules, the gas may dissociate into its atomic components or ionize, creating a plasma, which is sometimes referred to as the fourth state of matter.

Additionally, at extremely high temperatures, such as above 1000°C and pressures above 5 atm, a substance may enter a state known as a supercritical fluid, where it exhibits properties of both liquids and gases and does not have a distinct phase transition between liquid and gaseous states.

Answer:

1.008 L

Explanation:

To solve this question you need to know the equation for the reaction. The equation for the reaction will be:

2 AlCl3 + 3 F2 → 2 AlF3 + 3 Cl2

We have excess fluorine so aluminum chloride will be the limiting reagent of the reaction. The coefficient of aluminum chloride is 2 while the coefficient of chlorine gas is 3. If the molecular mass of the aluminum chloride is 133.34 g/mol then the number of chlorine gas made in moles will be:

4g/ (133.34 g/mol) * (3/2)= 0.045 moles

Assuming the reaction happens in STP, the volume will be: 0.045 moles * 22.4 L/mol= 1.008 L

1.008 liters of chlorine gas are produced from the reaction of 4.00 grams of aluminum chloride with fluorine.

To determine how many liters of chlorine gas are produced when 4.00 grams of aluminum chloride reacts with excess fluorine, we start with the balanced chemical equation for the reaction:

2 AlCl₃ (s) + 3 F₂ (g) → 2 AlF₃ (s) + 3 Cl₂ (g)

Step 1: Calculate the moles of aluminum chloride (AlCl₃).

Step 2: Use stoichiometry to figure out the moles of chlorine gas (Cl₂) produced.

Step 3: Convert moles of Cl₂ to liters using the ideal gas law under standard conditions (1 mole gas = 22.4 L at STP).

Thus, 4.00 grams of aluminum chloride reacting with excess fluorine produces approximately 1.008 liters of chlorine gas.

Answer:

sugar

Explanation:

its classified as an organic compound, not a mineral

also quizlet said so

Answer: Sugar

Explanation: Sugar classifies as an organic compound and so is not a mineral.

Answer:

Explanation:

A single replacement or single displacement reaction is a reaction in which one substance replaces another.

            A  +   BC →   AC + B

The replacement of an ion in solution by a metal higher in the activity series is a special example of this reaction type.

The relative positions of the elements in the activity series provides the driving force for single displacement reactions.

A double replacement reaction is one in which there is an actual exchange of partners between reacting species. This reaction is more common between ionic substances;

              AB + CD → AC + BD

Such reactions are usually driven by;

Answer:

sandstone

Explanation:

allows water to pass

The pressure inside the cylinder is 8.6 × 10⁻³ atm

Explanation:

At STP, the pressure is 1 atm. As per the Boyle's law, if the temperature of a gas is kept constant then its volume and pressure are inversely proportional to each other. So P₁V₁= P₂V₂

Now we have to find the P₂ as[tex]$\frac{P1V1}{V2}[/tex]

Inserting the given values, in the above expression, P1 = 1 atm, V1 = 0.0155 m³, V2 = 1.81 atm, P2 = ?, we will get P2 as,

P₂ = [tex]$\frac{0.0155\times1}{1.81}[/tex] = 8.6 × 10⁻³ atm

So the pressure inside the cylinder is 8.6 × 10⁻³ atm

Answer:

1.16x10^-23

Explanation:

1 mole of nitrogen has 6.02x10^23 number of nitrogen molecules. each molecule has 2 nitrogen atoms

Answer:

divide by molar mass (12.01 g)

Explanation:

To find the number of moles of the carbon, divide by molar mass (12.01 g).

The number of moles of a substance is given as;

           Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

To solve this problem;

  since mass of carbon  = 45g

                Number of moles  = [tex]\frac{45}{12.01}[/tex]   = 3.75moles

Answer:

3.35 moles.

Explanation:

Answer:

2.00 M

Explanation:

Answer:

2 NH3 + 2 Na = 2 NaNH2 + H2

Explanation:

Answer:

2NH3 + 2Na —> 2NaNH2 + H2

Explanation:

NH3 + Na —> NaNH2 + H2

The above can be balance by doing the following:

There are a total of 4 hydrogen atoms on the right and 3 atoms on the left. This can be balance by putting 2 in front of NH3 and 2 in front of NaNH2 as shown below:

2NH3 + Na —> 2NaNH2 + H2

There are 2 atoms of Na on the right and 1 atom on the left. It can be balance by putting 2 in front of Na as shown below

2NH3 + 2Na —> 2NaNH2 + H2

Now we can see that the equation is balanced as we have equal numbers of atoms of the different elements on both sides of the equation.

The molecular formula for the compound is  [tex]C_{3} H_{6}[/tex]

Explanation:

As with all of these problems, we assume 100 g of an unknown compound.

And thus, we determine the elemental composition by the given percentages.

Moles of carbon = 85.64 / 12.011

                            = 7.13 mol.

Moles of hydrogen = 14.36 / 1.00794

                               = 14.25 mol.

There are 2 moles of hydrogen per mole of carbon. And thus the empirical formula is CH[tex]_{2}[/tex].

And molecular formula = n × (empirical formula)

Thus, 42.08 = n × (12.011 + 2 × 1.00794)

And thus n = 3, and molecular formula = [tex]C_{3} H_{6}[/tex]

Carbon dioxide (CO₂) is the compound where atoms share two electron pairs each, forming two double covalent bonds between carbon and oxygen atoms.

The compound that has atoms sharing 2 electrons in a double covalent bond is carbon dioxide (CO₂). In this molecule, a carbon atom forms two double covalent bonds with two oxygen atoms. This is represented as O=C=O, indicating that each oxygen atom is sharing two electron pairs with the carbon atom. The carbon atom has four electrons in its valence shell and requires four more to become stable. Therefore, each double bond involves the sharing of two electron pairs, which makes a total of four electrons shared with each oxygen atom.

The compound that has atoms sharing 2 electrons is N2, which is nitrogen gas. Nitrogen gas consists of two nitrogen atoms that are bonded together by a triple covalent bond. Each nitrogen atom shares three electrons with the other nitrogen atom, resulting in a total of 6 shared electrons.

Answer:

B electrons because Valence electrons of the elements in the bond are shared. The gain , loss , or sharing of electrons occurs in every chemical bond.

The volume will be 2.25 L.

Explanation:

As per Charle's law, the volume of a gaseous system is directly proportional to the temperature provided the system is at constant pressure. Since volume of gas is directly proportional to the temperature of the gas molecules, V∝ T

So, in case there is a change in temperature with constant pressure, then there will be equal change in volume.

[tex]\frac{V_{1}}{V_{2} } = \frac{T_{1}}{T_{2} }[/tex]

Thus, here [tex]V_{1}[/tex] = 4.50 L , [tex]T_{1}[/tex]= 20 °C and [tex]P_{1}[/tex] = [tex]P_{2}[/tex] = 203 k Pa , [tex]T_{2}[/tex] = 10°C.

Since, volume and temperature is directly proportional then there will be increase in volume with increase in temperature and vice versa.

[tex]\frac{4.50}{V_{2} } = \frac{20}{10}[/tex]

[tex]V_{2} = \frac{4.50*10}{20} = 2.25 L[/tex]

So, the new volume is 2.25 L.

Answer: In my opinion I think the periodic table is the hardest.

Answer:

Ionic compound formula for Sodium chloride is NaCl

Explanation:

NaCl ---------> Na^+ + Cl^-

1.35 litres is the volume will the sample have if the pressure changes to 1.50 atm while the temperature is increased to 322 K.

Explanation:

Data given:

initial volume in the sample pf gas V1 = 1.42 L

initial temperature of the sample of gas T1 = 293 K

Initial pressure of the gas P1 = 1.30 atm

final pressure of the sample of gas  P2= 1.50 atm

final temperature of the sample of gas T2 = 322 K

Final volume V2 = ?

following formula is used:

[tex]\frac{P1V1}{T1}[/tex] = [tex]\frac{P2V2}{T2}[/tex]

V2 = [tex]\frac{P1V1T2}{P2T1}[/tex]

putting the values in the equation:

V2 = [tex]\frac{322 X 1.42 X 1.30}{1.50 X 293}[/tex]

   = 1.35 Litre is the volume

When pressure and temperature of the gas is changed the volume becomes 1.35 litres.

Answer:

The number of neutrons effects the mass

Explanation:

Answer:

0.454moles

Explanation:

Calculate the molar mass of AgBr

Ag=108

Br=80

Molar mass= 108+80

Molar mass=188g/mol

It's mole to gram question

2moles of Na2S2O3= 188g of AgBr

X moles of Na2S2O3=42.7g of AgBr

Cross multiply

188x=2×42.7

X= 85.4/188

X=0.454moles

Final answer:

To find the number of moles of Hg produced from 34.0g of HgO, divide the mass of HgO by its molar mass and use the stoichiometric relationship from the decomposition equation, resulting in 0.157 moles of Hg.

Explanation:

The question is how many moles of Hg (mercury) will be produced from 34.0g of HgO (mercury(II) oxide). To answer this, we need to use the concept of mole-mass stoichiometry. The molar mass of HgO is approximately 216.59 g/mol. First, you calculate the moles of HgO using its molar mass:

Number of moles = mass (g) / molar mass (g/mol).

Then, based on the balanced chemical equation for the decomposition of HgO, which is 2 HgO (s) → 2 Hg (l) + O2 (g), we see that the molar ratio of Hg to HgO is 1:1. Therefore, the moles of Hg produced will be equal to the moles of HgO that decomposed.

Here is the calculation:

In conclusion, 34.0g of HgO will produce 0.157 moles of Hg when decomposed.

Answer: 7.14mol/dm3

Explanation:

Molarity is calculated by dividing the amount of a substance in volume of the solution.

i.e Molarity = (Amount in moles/volume in liters or dm3)

Given that:

Amount of moles = 25.0 moles

Volume = 3.5 liters of solution

Recall that 1 liter = 1dm3

so, 3.5 liters = 3.5dm3

Molarity = (25.0moles/3.5dm3)

= 7.14mol/dm3

Thus, the molarity of the solution is 7.14mol/dm3

Answer:

The products of an endothermic reaction are less chemically stable.

Explanation:

They required an input of energy to create so naturally they are at a higher energy state.

In an endothermic reaction, the products have higher potential energy and are less stable than the reactants.

In an endothermic reaction, the products have higher potential energy and are less stable than the reactants. An endothermic reaction is a chemical reaction that absorbs heat from the surroundings. This means that the products of the reaction have a higher potential energy than the reactants. In other words, the reactants are in a more stable state than the products.

To understand this concept, consider a simple example: the dissociation of water into hydrogen and oxygen gases. This reaction is endothermic because it requires the input of energy to break the bonds between the hydrogen and oxygen atoms in water molecules.

As a result, the products of the reaction, hydrogen and oxygen gases, have a higher potential energy than the reactants, water molecules.

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Answer:

3. 049g

Explanation:

Molar mass of Ca = 40

Molar mass of Cl = 35.5

H = 1, O =16

Molar mass of CaCl2.9H20 = [40 + (35.5*2) + (9*18)]

CaCl2.9H20 = 273g/mol

Molar mass of CaCl2 = 40 + (35.5*2) = 111g/mol

111g of CaCl2 is present in 273g of CaCl2.9H20

Xg of CaCl2 is present in 7.5g of CaCl2.9H20

X = (7.5*111) / 273

X = 3.049g

Final answer:

To find the quantity of pure CaCl₂ in 7.5 g of CaCl₂•9H₂O, you need to calculate the molar masses of both the hydrated and anhydrous forms, find the number of moles in 7.5 g, and then convert this to grams of pure CaCl₂.

Explanation:

To determine the quantity of pure CaCl₂ in 7.5 g of CaCl₂•9H₂O, we first need to calculate the molar mass of the hydrated compound and then the molar mass of anhydrous CaCl₂. After that, using stoichiometry, we find out how many moles of the hydrated compound we have in 7.5 g and convert this to the mass of anhydrous CaCl₂.

The quantity of pure CaCl₂ in 7.5 g of CaCl₂•9H₂O is therefore approximately 3.05 g.