which of the following reactions produce a basic solution (the hydroxide ion)? select one or more: a. na(s) cold water b. nah cold water c. na2o cold water d. mg cold water e. ni cold water

Answer:

the difference is  the presence of a carbon atom

Explanation:

Given :

Mass of gold ( Au ) is 212 gram.

To Find :

Atoms of gold present in 212 gram of gold.

Solution :

Molecular mass of gold is 197 gram.

So, number of moles of gold in 212 gram is :

\(n = \dfrac{212}{197} \ moles\\\\n = 1.076 \ moles\)

Now, we know 1 mole of any element contains \(6.022 \times 10^{23}\) atoms.

So, number of atoms present in 1.076 moles are :

\(N = 1.076 \times 6.022\times 10^{23}\\\\N = 6.48 \times 10^{23}\)

Hence, this is the required solution.

True , A catalyst is a substance that quickens a chemical reaction; therefore, in homogeneous catalysis, the catalyst and reactants are in the same phase. Most of the time, everything will exist as a gas or be contained within a single liquid phase.

The difference between heterogeneous and homogeneous catalysts is that the former are in the same phase as the latter are not.

A single phase is what is meant by the notion of a pure substance or homogenous mixture. There are two or more phases in a heterogeneous mixture. Water and oil do not mix uniformly when combined; instead, two distinct layers are created.

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Answer:

Soda all start with watered down corn syrup. To get the carbonation companies have different ways of doing this all of which are very different. The last step is to add artificial and natural flavors like lemon and lime, this is also the step in which sugar and preservatives are added.

Explanation:

I hope this answer your question, srry I couldn't go into detail.

Answer:

D. Mass is the amount of matter and weight is the effect of gravity on mass.

Explanation:

Mass is, by definition, the amount of matter that makes up an object. The weight of an object is directly related to the pull of gravity.

Answer:

A new type of technology that uses stem cells to grow body parts is called stem cell scaffolding.

Explanation:

"In stem cell transplants, stem cells replace cells damaged by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and blood-related diseases, such as leukemia, lymphoma, neuroblastoma, and multiple myeloma. These transplants use adult stem cells or umbilical cord blood." - Mayo Clinic

The quantity of heat produced by burning one mole of wax is determined by the heat of combustion (∆Hc) of the wax, which is typically around -40 kJ/mol.

To calculate the quantity of heat produced when one mole of wax is burned, we need to consider the heat of combustion (∆Hc) of the wax. The heat of combustion is the amount of heat released when a substance undergoes complete combustion with oxygen.

For candle wax, which is primarily composed of hydrocarbons like paraffin, the heat of combustion can vary, but it's generally around -40 kJ/mol. The negative sign indicates that the process is exothermic, meaning heat is released. Therefore, burning one mole of candle wax would produce approximately 40 kJ of heat.

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1 mole MgC2H3O2

Step 1

Information needed: The mass of each element per mol (the periodic table is recommended to use)

Mg) 24.305

C) 12.011

H) 1.007

O) 15.999

--------------

Step 2

Procedure:

1 mole MgC2H3O2 = 24.305 (Mg) + 2 x 12.011 (C) + 3 x 1.007 (H) + 2 x 15.999 (O) = 83.346 g

Therefore, the molar mass of MgC2H3O2 = 83.346 g/mol

Answer: 1 mole MgC2H3O2 = 83.346 g

---------------------

CaCO3:

The masses per mole:

Ca) 40.078

C) 12.011

O) 15.999

1 mole CaCO3 = 40.078 + 12.011 + 3 x 15.999 = 100.08 g

-------------------

Cu(CN)2:

The masses per mole:

Cu) 63.546

C) 12.011

N) 14.006

1 mole Cu(CN)2 = 63.546 + 2 x 12.011 + 2 x 14.006 = 115.58 g

---------------------

Na2CO3:

Na) 22.989

C) 12.011

O) 15.999

1 mole Na2CO3 = 2 x 22.989 + 12.011 + 3 x 15.999 = 105.98 g

Answer:

Instantly Convert Kilograms (kg) to Pounds (lb av) and Many More Mass Conversions Online. Kilograms ... 1 Kilogram: The kilogram is defined as being equal to the mass of the ... 30 Kilograms to Pounds = 66.1387, 1,000 Kilograms to Pounds = 2204.6226 ... Kilograms to Newtons · Kilograms to Grams · Kilograms to Tonnes ...

Explanation:

If the pink flowers were replaced with blue ones, the number of moths that are attracted to pink flowers would decrease while the number of moths that are attracted to blue flowers would increase.

Moths are attracted to flowers based on the color of the flowers. Pink flowers are known to attract moths that have a preference for pink, while blue flowers attract moths that have a preference for blue. Therefore, if the pink flowers were replaced with blue ones, the moths that were previously attracted to the pink flowers would have no reason to stay and would move on to other flowers that have similar colors to pink. Meanwhile, the moths that were previously attracted to blue flowers would have a reason to come to the area with the new blue flowers and increase in number. This cause-and-effect relationship is based on the fact that moths are attracted to flowers based on color.

Moths that are attracted to pink flowers may have a harder time finding food sources, leading to a decline in their population. Moths attracted to blue flowers would have more food sources available, resulting in an increase in their population due to improved survival and reproductive rates.
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Answer:

C. Helium Atom

Explanation:

Helium has less mass than hydrogen, proton, and electron

During the electrolysis of an aqueous NaCl solution, H2, and OH- are produced at the cathode, and O2 and H+ are produced at the anode.

In the electrolysis of an aqueous NaCl solution, the products at the cathode and anode can be determined by comparing the standard reduction potentials (Eo) of the half-reactions involved.

At the cathode, reduction occurs, and we have two possible reactions:
1. Na+ + e- → Na; Eo = -2.7 V
2. 2H2O + 2e- → H2 + 2OH-; Eo = -0.4 V

Since a more positive Eo is favored, the second reaction (Eo = -0.4 V) will occur at the cathode, producing H2 and OH-.

At the anode, oxidation takes place, and we have two potential reactions:
1. Cl2 + 2e- → 2Cl-; Eo = 1.4 V
2. O2 + 4H+ + 4e- → 2H2O; Eo = -0.82 V

For oxidation, we need to reverse the reactions and change the sign of the Eo values:
1. 2Cl- → Cl2 + 2e-; Eo = -1.4 V
2. 2H2O → O2 + 4H+ + 4e-; Eo = 0.82 V

The more positive Eo is still favored, so the second reaction (Eo = 0.82 V) will occur at the anode, producing O2 and H+.

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Answer:

It creates a rainbow

Explanation:

Cause of the reflectiveness of the water it could possibly form another light but more colorful. you can see how it works when its becomes summer, get a water hose and just let it flow. you'll see a miniature rainbow.

Answer:

\(\boxed {\boxed {\sf 5.35 \ L}}\)

Explanation:

Molarity is a measure of concentration in moles per liter.

\(molarity= \frac{moles \ of \ solute}{liters \ of \ solution}}\)

We know the molarity of the solution is 0.99 M and there are 5.3 moles of the solute, CuCl₂.

So,

Substitute these values into the formula.

\(0.99 \ mol \ CuCl_2 / L =\frac{5.3 \ mol \ CuCl_2}{x}\)

Now, solve for x by isolating the variable. First, cross multiply.

\(\frac {0.99 \ mol \ CuCl_2}{1}=\frac {5.3 \ mol \ CuCl_2}{x}\)

\(0.99 \ mol \ CuCl_2 /L *x= 5.3 \ mol \ CuCl_2*1\)

\(0.99 \ mol \ CuCl_2 /L *x= 5.3 \ mol \ CuCl_2\)

x is being multiplied by 0.99 mol CuCl₂/L. The inverse of multiplication is division. Divide both sides of the equation by 0.99 mol CuCl₂/L .

\(\frac {0.99 \ mol\ CuCl_2 / L*x}{ 0.99 \ mol\ CuCl_2 \ L }=\frac {5.3 \ mol \ CuCl_2}{0.99 \ mol\ CuCl_2 \ L }\)

\(x=\frac {5.3 \ mol \ CuCl_2}{0.99 \ mol\ CuCl_2 \ L }\)

\(x=5.35353535354 \ L\)

Let's round to the hundredth place. The 3 in the thousandth place tells us to leave the 5 in the hundredth place.

\(x \approx 5.35 \ L\)

Approximately 5.35 liters are needed to make a 0.99 M solution with 5.3 moles of solute.

Fresh water collection areas is the area where you can find most of the

world's drinking water.

This is the type of water which contains low amount of dissolved salts and

solid particles which makes it very suitable for drinking.

Examples of Freshwater collection areas include the following:

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Answer:

Activation energy is the minimum amount of energy required for a chemical reaction to occur. It acts as a barrier that must be overcome for reactant molecules to transform into products. In other words, it is the energy input necessary to break the bonds of the reactant molecules and initiate the reaction.

The role of activation energy is crucial in determining the rate of a chemical reaction. Reactions with lower activation energy proceed more quickly because a higher proportion of reactant molecules have sufficient energy to overcome the activation barrier. On the other hand, reactions with higher activation energy have a slower rate since only a small fraction of reactant molecules possess the required energy.

An example of activation energy can be seen in the combustion of methane (CH4) in the presence of oxygen (O2) to form carbon dioxide (CO2) and water (H2O). This reaction requires an ignition source, such as a spark or flame, to supply the activation energy. Once the initial activation energy is provided, the reaction proceeds exothermically, releasing energy in the form of heat and light.

Without the activation energy, the reactant molecules would remain stable and the reaction would not occur spontaneously. Activation energy ensures that reactions proceed at appropriate rates and provides a control mechanism for chemical transformations.

The parts of the periodic table are;

1) Alkali earth metals

2) Alkaline earth metals

3) Metals

4) Transition metals

5) Lanthanides

6) Actinides

7) Noble gases

8) Halogens

9) Nonmetals

10) Metalloids

The periodic table is a tabular representation of the chemical elements arranged in order of their atomic number, electron configurations, and chemical properties.

The table is divided into rows and columns, with each row (also called a period) corresponding to a different energy level of the atom's electrons, and each column (also called a group or family) representing elements with similar chemical properties.

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2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

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Mass of calcium carbonate (in grams) can be dissolved by 4.1 g of Hcl is 5.62g.

A balanced equation is one for a chemical reaction in which the overall charge and the number of atoms for each component are the same for both the reactants and the products. In other words, the mass and charge of both sides of the reaction are equal.

The reaction between calcium carbonate and hydrochloric acid can be expressed through the chemical reaction,

CaCO₃ + 2HCl --> CaCl₂ + H₂O + CO₂

Hydrochloric acid has a molecular weight of 36.45 g/mol compared to calcium carbonate's molecular weight of 100 g/mol. According to the equation above, 72.9 g of hydrochloric acid may dissolve 100 g of calcium carbonate.

x = (4.1 g HCl)(100 g CaCO3 / 72.9 HCl)

x = 5.62 g.

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The fugacity in atm for pure ethane at 310 K and 20.4 atm is given by the equation: f = 20.4 exp (-Δg1/RT). The change in chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm is -0.0911RT.

Fugacity is a measure of the escaping tendency of a component in a mixture, which is defined as the pressure that the component would have if it obeyed ideal gas laws. It is used as a correction factor in the calculation of equilibrium constants and thermodynamic properties such as chemical potential. Here we need to determine the fugacity in atm for pure ethane at 310 K and 20.4 atm and the change in the chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm. So, using the formula of fugacity: f = P.exp(Δu/RT) Where P is the pressure of the system, R is the gas constant, T is the temperature of the system, Δu is the change in chemical potential of the system.  Δu = RT ln (f / P)The chemical potential at the initial state can be calculated using the ideal gas equation as: PV = nRT    

=>  P

= nRT/V

=> 20.4 atm

= nRT/V

=> n/V

= 20.4/RT The chemical potential of the system at the initial state is:

Δu1 = RT ln (f/P)

= RT ln (f/20.4) Also, we know that for a pure substance,

Δu = Δg. So,

Δg1 = Δu1 The change in pressure is 24 atm – 20.4 atm

= 3.6 atm At the second state, the pressure is 24 atm.

Using the ideal gas equation, n/V = 24/RT The chemical potential of the system at the second state is: Δu2 = RT ln (f/24) = RT ln (f/24) The change in chemical potential is Δu2 – Δu1 The change in chemical potential is

Δu2 – Δu1 = RT ln (f/24) – RT ln (f/20.4)

= RT ln [(f/24)/(f/20.4)]

= RT ln (20.4/24)

= - 0.0911 RT Therefore, the fugacity in atm for pure ethane at 310 K and 20.4 atm is:

f = P.exp(Δu/RT)

=> f

= 20.4 exp (-Δu1/RT)

=> f

= 20.4 exp (-Δg1/RT) And, the change in the chemical potential between this state and a second state of ethane where the temperature is constant but pressure is 24 atm is -0.0911RT. Therefore, the fugacity in atm for pure ethane at 310 K and 20.4 atm is given by the equation: f = 20.4 exp (-Δg1/RT). The change in chemical potential between this state and a second state of ethane where the temperature is constant but the pressure is 24 atm is -0.0911RT.

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Answer:

Mass is used to measure the weight of an object. For example, you are measuring the mass of your body when you step on to a scale. In the metric system of measurement, the most common units of mass are the gram and kilogram.

Explanation:

The first person to explain Brownian motion and make a convincing case for the existence of atoms was Albert Einstein.

In 1905, Einstein published a paper titled "Über die von der molekularkinetischen Theorie der Wärme geforderte Bewegung von in ruhenden Flüssigkeiten suspendierten Teilchen" ("On the Movement of Small Particles Suspended in Stationary Liquids Required by the Molecular-Kinetic Theory of Heat"), in which he presented a theoretical explanation for the random motion of particles in a fluid, known as Brownian motion.

Einstein's analysis provided strong evidence for the existence of atoms and molecules, which had been hypothesized by scientists for centuries but had not yet been directly observed. Einstein's work on Brownian motion is widely considered to be one of the most important contributions to the development of modern physics.

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Answer:

70

Explanation:

density=mass/volume

therefore mass = density*volume

20*3.5=70

Answer: Carbon cycle wouldn't be able to create rock formation. Respiration, consumption, combustion (such as fossil burning) are all part of the carbon cycle. They would all be possible without internal energy. Except rock formation.

Explanation:

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

H=12

O=6+12=18

C=6

and the equation is balanced

The given structure is of formaldehyde an organic compound and it is acidic in nature.

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Answer:

The answer to your question is A.

D. Protective coloration.  Protective coloration, also known as "crypsis," is a defense mechanism used by animals to avoid detection by predators or prey.

An illustration of protective coloration, which is a sort of camouflage, is how white arctic hares blend in with the white snow around them. Animals use protective coloration, commonly referred to as "crypsis," as a defensive strategy to evade being seen by predators or prey.

In this instance, the white arctic hares' fur is the same shade as that of their snowy environment. Their chances of survival are increased by this merging, which enables them to remain unnoticed and effectively hidden from predators like polar foxes or birds of prey. They have a better chance of escaping or avoiding detection when they are well-camouflaged, making it difficult for predators to see them against the white background.

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