for the question(s) that follow, consider the following balanced equation. mg3n2(s) 6h2o(l) → 3mg(oh)2(s) 2nh3(g) how many grams of h2o are needed to produce 150 g of mg(oh)2?

Answer:

Moving the balls closer together. The distance decreases and force increases.

Answer:

+35

Explanation:

Answer:

atomic weight..................

According to the ideal gas equation and mole concept, there is 0.721 grams of HF present in the sample.

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

Substitution in above equation gives n=2×4.50/8.314×300=0.036 which is mass= 0.036×20=0.721 g.

Thus, there is 0.721 grams of HF present in the sample.

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Answer:

2.232 g/L

Explanation:

Assuming 1 mol, volume at STP is 22.4 L so you simply divide 50g by 22.4 L to get density

The density of the given gas is required.

The density of the gas at STP is 2.232 g/L.

M = Molar mass of gas = 50 g/mol

1 mole of any gas at STP occupies 22.4 L.

V = Volume per mole = 22.4 L/mol

Density is given by

\(\rho=\dfrac{M}{V}\\\Rightarrow \rho=\dfrac{50}{22.4}\\\Rightarrow \rho=2.232\ \text{g/L}\)

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Answer:

Ramsey and Marshall method.

Explanation:

The specific latent heat of vapourization of a liquid is measured by a modification of the method of Ramsey and Marshall in the year 1896.

Answer:

asdd

Explanation:

adsade4223

Answer:

it holds reactant molecules in a good position for then to react

Answer:

D. It holds reactant molecules in a good position for them to react.

Explanation:

Got a 100 on e2020.

The appropriate number of significant figures in the result of 15.234 – 15.208 is false because Significant figures are a way of representing a certain number of significant digits that are used to give an accurate representation of the result of a calculation.

In this particular example, the answer of 15.234 - 15.208 is 0.026. The correct number of significant figures in the result of this calculation is three, not four. The significant figures in a number are the digits that carry meaning and can be used to describe the accuracy of the number. In this case, the first two digits “15” are the same number and, therefore, do not carry any significance.

The last two digits “.23” and “.20” are significant because they are different and are the only digits that carry meaning. When performing calculations, it is important to pay attention to the number of significant figures in the result. For example, when subtracting two numbers, the result can be no more precise than the least precise number used in the calculation. In this case, the least precise number is 15.208, so the result should only have two significant digits.

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Answer:

\(\boxed {\boxed {\sf 1290 \ g \ PI_3}}\)

Explanation:

We want to convert from moles to grams, so we must use the molar mass.

The molar mass is the mass of 1 mole of a substance. It is the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units (amu).

We are given the compound PI₃ or phosphorus triiodide. Look up the molar masses of the individual elements.

Note that there is a subscript of 3 after the I in the formula. This means there are 3 moles of iodine in 1 mole of the compound PI₃. We should multiply iodine's molar mass by 3, then add phosphorus's molar mass.

Use the molar mass as a ratio.

\(\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}\)

We want to convert 3.14 moles to grams, so we multiply by that value.

\(3.14 \ mol \ PI_3 *\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}\)

The units of moles of PI₃ cancel.

\(3.14 *\frac {411.687262 \ g \ PI_3}{ 1 }\)

\(1292.698 \ g\ PI_3\)

The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tens place.

The 2 in the ones place tells us to leave the 9.

\(1290 \ g \ PI_3\)

3.14 moles of phosphorous triiodide is approximately equal to 1290 grams of phosphorus triodide.

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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A plot of lnk vs. 1/T has a slope of -k k E a -Ea/R A. The pace of reaction increases as the concentrations of reactant molecules rise. The average kinetic energy of molecules increases as the reactant concentration rises, which is the best explanation for this occurrence.

Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.

According to the context, the term may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms held together by attractive forces known as chemical bonds.

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The empirical formula represents the simplest whole-number ratio of atoms in a compound. To determine the empirical formula for C4H10O2, we need to find the simplest ratio of carbon, hydrogen, and oxygen atoms.

Let's start by determining the number of carbon atoms.

The subscript 4 in C4H10O2 indicates that there are four carbon atoms present.

Next, let's determine the number of hydrogen atoms. The subscript 10 in C4H10O2 indicates that there are ten hydrogen atoms.

Finally, let's determine the number of oxygen atoms. The subscript 2 in C4H10O2 indicates that there are two oxygen atoms.

To find the simplest whole-number ratio, we need to divide the number of atoms by their greatest common divisor (GCD).

The GCD of 4, 10, and 2 is 2. Dividing each number by 2, we get:

C4H10O2 divided by 2:

Carbon: 4 ÷ 2 = 2

Hydrogen: 10 ÷ 2 = 5

Oxygen: 2 ÷ 2 = 1

The simplest whole-number ratio is C2H5O, which corresponds to option (a) in the given choices.

The empirical formula for C4H10O2 is C2H5O.

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Answer:

Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they're random) but may not affect the overall accuracy of a result.

Answer:

New growth of trees is an exception

Explanation:

when volcanoes erupt, they release hot magma that is destructive to the environment causing personal damage, lack of breathable air and death.

heat produce cannot in any way help in growth of trees

The correct answer is option D. Having a large number of people working together ensures that new insights in solving a problem will occur.

Engineers and scientists have knowledge in different fields. Science is a study of nature and the scientists are the people who study science, the study of nature or how the natural world works.

Scientists study and gain knowledge about the nature and the engineers apply it to make use of the knowledge about science.

It can be said they are interdependent. As working closely, the data is exchanged or shared between scientists and engineers. Both scientists and engineers have their own ideas and thoughts.

Scientists can help engineers to develop analytical and research skill which can help engineers to write better code to make best use of science.

Thus, people working together on different aspects, they can have new insights. This helps to look at the situation from different angles and can solve the problems easily and in a better way.

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The equilibrium concentration of N₂ would be 0 M.

The equilibrium concentration of N₂ will depend on the initial concentrations of N₂ and H₂, as well as the equilibrium constant (Kc) for the reaction. Assuming that the reaction is carried out at a constant temperature and pressure, the equilibrium concentrations of the species can be calculated using the equilibrium constant expression,

\(Kc = \dfrac{[NH_3]^2}{([N_2] \times [H_2]^3)}\)

We can assume that the reaction proceeds to completion, which means that all the N₂ reacts to form NH3. Thus, the concentration of N₂ at equilibrium will be zero.

So the equilibrium concentration of N₂ would be 0 M.

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A solution has a volume of 0.709 l and contains 7.95 mol of ammonium nitrate (nh4no3).The molarity of the solution is approximately 11.2 M.

Molarity is defined as the number of moles of solute per liter of solution. To calculate the molarity of the solution, we divide the number of moles of ammonium nitrate (NH4NO3) by the volume of the solution in liters.

Given that the solution contains 7.95 mol of ammonium nitrate and has a volume of 0.709 L, we can calculate the molarity as follows:

Molarity = Number of moles of solute / Volume of solution in liters

= 7.95 mol / 0.709 L

≈ 11.2 M

Therefore, the molarity of the solution is approximately 11.2 M.

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Answer:

in 6A, oxygen is the most electronegative, and polonium is the least

in the list given, chlorine is the most electronegative

Explanation:

Electronegativity increases across the period and decreases down the group

The elements in group 6A in order are:

oxygen , sulfur , selenium, Tellurium, and Polonium

Oxygen is the most electronegative, Polonium is the least electronegative

From the list given, chlorine is the most electronegative since it has the farthest group to the right

The fraction of chromium in cr(h2o)w21(oh)21 is 0.000185.

Regardless of how strong or weak an acid is, it dissociates into water in a similar way.

H+ A -> H A-.

Its dissociation constant value is influenced by the acid's Ka value, which is defined as the acid's dissociation constant. If Ka is higher, the acid is more acidic, and vice versa if pKa is higher, the acid is more acidic.

More pKa is equal to -log(Ka), so if Ka is 10 then pKa is -1, and if Ka is 1000 then pKa is -3, meaning that the less acidic the solution is, the more pKa there is.

Consider that I had an acid with a C initial concentration. If a certain amount of A dissociates upon equilibrium, I obtain the equilibrium concentration of the acid as C-A and the equilibrium concentration of both H and the conjugate (Ac-) as A. because their stoichiometric coefficients are nearly equal for both.

You can write the Ka expression as follows using this information.

Ka is equal to [H] [Ac-] / [HAc].

A * A / C-A results from substitution.

Fraction of chromium= Ph/Pk

=0.010/53.80=0.000185.

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The property of every mixture is right response is D)One substance can be separated from another through physical means.

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Answer:

A. The birthrate is higher than the death rate

Explanation:

Cobalt-60 is a radioisotope used in cancer treatment due to its ability to emit gamma rays and beta particles. A 100.0-gram sample is stored in a hospital for targeted radiation therapy, Therefore,

1. Cobalt-60 emits gamma rays and beta particles. Gamma rays are highly penetrating, while beta particles have a moderate penetrating power.

2. Radiation damage to healthy cells is a risk associated with the use of radioisotopes to treat cancer.

3. It will take approximately 52.33 years for 12.5 grams of cobalt-60 to decay to 12.5 grams.

1. The penetrating power of the two emissions from Cobalt-60 can be compared as follows:

- Gamma rays: Gamma rays are highly penetrating electromagnetic radiation. They have a high energy and can easily pass through materials, including human tissue. They can travel long distances and are capable of penetrating deep into the body.

- Beta particles: Beta particles are high-energy electrons or positrons. They have a moderate penetrating power and can penetrate through materials to a certain extent. However, they have a shorter range compared to gamma rays and are generally absorbed within a few centimeters of tissue.

2. One risk to human tissue associated with the use of radioisotopes to treat cancer is radiation damage to healthy cells. While the treatment is targeted towards cancer cells, nearby healthy cells can also be affected by the radiation. This can lead to side effects such as radiation burns, tissue damage, or long-term complications.

3. The half-life of Cobalt-60 is approximately 5.27 years. This means that half of the original sample will decay over this time period. To determine the time when 12.5 grams of the original sample remains unchanged, we can set up the following equation:

\(12.5\,\text{grams} = 100\,\text{grams} \cdot \left(\frac{1}{2}\right)^{\frac{t}{5.27}}\)

Solving for t (time), we find:

\(t = 5.27\,\text{years} \cdot \log(0.125) / \log(1/2)\)

To solve the equation \(t = 5.27\,\text{years} \cdot \log\left(\frac{12.5\,\text{grams}}{100\,\text{grams}}\right) / \log\left(\frac{1}{2}\right)\) , we can use the properties of logarithms and basic algebraic steps.

First, let's simplify the equation:

\(t = 5.27\,\text{years} \cdot \log(0.125) / \log\left(\frac{1}{2}\right)\)

Next, evaluate the logarithms:

\(\begin{equation}t = 5.27\text{ years} \times (-0.9031) \div (-0.3010)\)

t ≈ 52.33 years

Therefore, the solution to the equation is approximately t = 52.33 years.

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Besides building teeth and bones, calcium also keeps your blood and muscles moving and helps your nerves send messages from your brain to the rest of your body. Your body can't make calcium, so you need to get it from food or supplements. While you're pregnant, try to get at least 1,000 mg of calcium every day.

Calcium is a vital mineral. Your body uses it to build strong bones and teeth. calcium is also needed for your heart and other muscles to function properly

To find the number of moles of NaOH present in 30.0 mL of 0.140 M NaOH, we can use the formula:

moles of solute = concentration x volume

where "solute" refers to the substance of interest (in this case, NaOH), "concentration" is the molarity of the solution, and "volume" is the volume of the solution in liters.

First, we need to convert the volume of the solution from milliliters to liters:

30.0 mL = 30.0/1000 = 0.030 L

Next, we can substitute the given values into the formula:

moles of NaOH = 0.140 mol/L x 0.030 L = 0.0042 moles

Therefore, there are 0.0042 moles of NaOH present in 30.0 mL of 0.140 M NaOH.

Answer:

What do you want answered?

Explanation:

The four types of crystals are ionic crystals, metallic crystals, covalent crystals, and molecular crystals.

Crystal, any solid material in which the component atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry.

An ionic crystal is a crystalline ionic compound. They are solids consisting of ions bound together by their electrostatic attraction into a regular lattice.

A crystalline solid in which the atoms are held together by metallic bonds. Metallic crystals are found in some interstitial compounds as well as in metals and alloys.

Covalent Crystals also called atomic crystals are the molecular solids in which the same or different atoms are joined together by covalent bonding.

Molecular crystals are substances that have relatively weak intermolecular binding, such as dry ice.

Thus, there are four types of crystals such as ionic crystals, metallic crystals, covalent crystals, and molecular crystals.

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The pH of the solution is 6.11.

The first step is to write out the chemical equations for the ionization of the diprotic acid, H2A. The equations are:

\(H_2A \rightleftharpoons H^+ + HA^- \ \ \ \ (K_{a1})$$HA^- \rightleftharpoons H^+ + A^{2-} \ \ \ \ (K_{a2})$\)

The equilibrium constant for the second ionization, Ka2, is given as 5.37 × 10⁻⁷. We can use the equation for Ka2 to calculate the concentration of H+ in the solution:

\(K_{a2} = \frac{[H^+][A^{2-}]}{[HA^-]}$$[H^+] = \frac{K_{a2}[HA^-]}{[A^{2-}]}$[H^+] = \frac{5.37 \times 10^{-7}(0.0226)}{0.0158}$$[H^+] = 7.7 \times 10^{-7} \ M$\)

Now, we can use the equation for the pH of a solution to calculate the pH of the solution:

pH = -log[H+]

pH = -log(7.7 × 10⁻⁷)

pH = 6.11

Therefore, the pH of the solution is 6.11.

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Answer:

Nuclear fusion, Conduction, Conduction, Radiation.

The Sun produces energy deep inside its core by fusing hydrogen atoms together to form heavier ones through nuclear fusion. Conduction and convection are used to move heat from the core to the surface.

Radiation is the electromagnetic transmission of heat energy through space. The majority of the electromagnetic radiation that the sun emits and that reaches the Earth is invisible. Only a tiny fraction is visible light. Light consists of waves of various frequencies.

When two objects with different surface temperatures come in contact with one another, conduction happens. Up until they reach the same temperature, heat moves from the warmer to the cooler object. Heat moves through a substance by conduction when molecules collide.

Thus the correct order is Nuclear fusion, Conduction, Conduction, and Radiation.

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