6 List What are two advantages and two
limitations of physical models?
Plz help

Answer:

Concentration is measured in moles per cubic decimetre: mol dm–3. To find the concentration of a solution, divide the number of moles by the volume in dm3. If the volume is in cm3, divide the volume by 1000 first to convert it into dm3.

Explanation:

......what is that 2 after =

Answer:

Copper will start to react with the oxygen in the air to form copper oxide. The copper oxide will continue reacting to oxygen over time. As the copper oxide continues to react with carbon dioxide and water in the air it coats the surface with that iconic blue-green patina colour

Answer:

a  lipped cylindrical glass container for laboratory use

Explanation:

Answer:

ffffffffffffff

Explanation:

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

Answer:

a)  \(T_b=590.775k\)

b)  \(W_t=1.08*10^4J\)

d)  \(Q=3.778*10^4J\)

d)  \(\triangle V=4.058*10^4J\)

Explanation:

From the question we are told that:

Moles of N2 \(n=2.50\)

Atmospheric pressure \(P=100atm\)

Temperature \(t=20 \textdegree C\)

                      \(t = 20+273\)

                     \(t = 293k\)

Initial heat \(Q=1.36 * 10^4 J\)

a)

Generally the equation for change in temperature is mathematically given by

\(\triangle T=\frac{Q}{N*C_v}\)

  Where

  \(C_v=Heat\ Capacity \approx 20.76 J/mol/K\)

\(T_b-T_a=\frac{1.36 * 10^4 J}{2.5*20.76 }\)

\(T_b-293k=297.775\)

\(T_b=590.775k\)

b)

Generally the equation for ideal gas is mathematically given by

 \(PV=nRT\)

For v double

 \(T_c=2*590.775k\)

 \(T_c=1181.55k\)

Therefore

\(PV=Wbc\)

\(Wbc=(2.20)(8.314)(1181_590.778)\)

\(Wbc=10805.7J\)

Total Work-done \(W_t\)

\(W_t=Wab+Wbc\)

\(W_t=0+1.08*10^4\)

\(W_t=1.08*10^4J\)

c)

Generally the equation for amount of heat added is mathematically given by

\(Q=nC_p\triangle T\)

\(Q=2.20*2907*(1181.55-590.775)\\\)

\(Q=3.778*10^4J\)

d)

Generally the equation for change in internal energy of the gas is mathematically given by

\(\triangle V=nC_v \triangle T\)

\(\triangle V=2.20*20.76*(1181.55-293)k\)

\(\triangle V=4.058*10^4J\)

Answer: Pentane C5H12

Explanation:

The boiling point of a substance is simply defined as the temperature whereby a liquid's vapor pressure is equal to the pressure that is surrounding the liquid and hence, the liquid will changes into vapor.

The likely molecular formula for this compound is Pentane i.e C5H12 due to the fact that its boiling point is between Butane with formula C4H10 and Hexane with formula C6H14 boiling points.

The molecular formula of the of the substance is \(\bold {C_5H_1_0}\) (pentane).

Boiling point:

It is the temperature at which liquid's vapor pressure is equal to the pressure that is surrounding the liquid and hence, the liquid start to into vaporize.

The boiling point of the given compound is 309 K which is between Butane  and Hexane.

Therefore, the molecular formula of the of the substance is \(\bold {C_5H_1_0}\) (pentane).

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Answer:

its 2,2,1

Explanation:

A stationary front is a boundary between two different air masses that aren't moving relative to each other, but instead are stationary.An air mass is a massive body of air with uniform temperature and moisture characteristics. An air mass takes on the qualities of the area where it forms. As an air mass moves from one place to another, it carries its temperature and moisture content with it.

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The enthalpy change for the reaction is 7520.3 kJ.

What is enthalpy?

Enthalpy is a thermodynamic property of a system that describes the total heat content of the system. It is denoted by the symbol "H" and is defined as the sum of the internal energy of a system and the product of its pressure and volume.

Enthalpy is a state function, meaning that its value depends only on the initial and final states of the system, not on how the system got from one state to the other.To determine the enthalpy change for the reaction:P4O6(s) + 2 O2(g) → P4H10(s)We can use Hess's law, which states that the enthalpy change for a reaction is independent of the pathway taken to get from reactants to products, and depends only on the initial and final states.

In other words, the total enthalpy change for a reaction is equal to the sum of the enthalpy changes for the individual steps of the reaction.

We can write the reaction in terms of the given reactions as follows:P4(s) + 3 O2(g) → P4O6(s) ΔH = -1640.1 kJP4(s) + 5 O2(g) → P4H10(s) ΔH = -2940.1 kJP4O6(s) + O2(g) → P4(s) + 3 O2(g) ΔH = 1640.1 kJ (reverse of reaction 1)To obtain the desired reaction, we need to reverse reaction 2 and multiply it by 2, then add reaction 3 to it.

This gives:2(P4H10(s) → P4(s) + 5 O2(g)) ΔH = 2(2940.1 kJ) = 5880.2 kJP4O6(s) + O2(g) → P4(s) + 3 O2(g) ΔH = 1640.1 kJP4O6(s) + 2 O2(g) → P4H10(s) ΔH = 7520.3 kJ

Therefore, the enthalpy change for the reaction is 7520.3 kJ.

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The binding energy per nucleon for the ¹⁹F nucleon is equal to 7.786 MeV/nucleon.

Binding energy can be defined as the minimum quantity of energy that is required to remove the particle from the system. Nuclear binding energy can be described as the energy required to dismantle a nucleus of an atom into free neutrons and protons.

The binding energy will be determined from the mass defect. Mass defect is calculated from the difference between the mass observed and the expected combined mass.

Given the mass of the ¹⁹F = 18.9984 a.m.u.

The mass defect for the ¹⁹F can be calculated as:

Δm = \((M _n +M_p) - M_F\)

\(\triangle m =( 9\times 1.0078 + 10 \times 1.0087 )- 18.9984\)

\(\triangle m =0.1588 \;a.m.u.\)

The binding energy for the fluorine can be calculated as:

E = Δmc²

E = 0.1588 × 931.5

E = 147.92 MeV

The binding energy per nucleon of ¹⁹F can be calculated as:

B.E.N. = 147.92/18.9984 = 7.786 MeV per nucleon

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Increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.

In the given chemical equation, the reaction between barium sulfide (BaS) and oxygen gas (O2) produces barium sulfate (BaSO4).

When the amount of oxygen is increased in the reaction, it would favor the production of more barium sulfate. This is because oxygen acts as a reactant in the formation of barium sulfate. By increasing the concentration or availability of oxygen, more oxygen molecules will be available to react with the barium sulfide. The increase in oxygen will provide more oxygen atoms for the formation of sulfate ions (SO4^2-) from the sulfide ions (S^2-) in barium sulfide. Consequently, more barium sulfate will be produced in the reaction. Therefore, increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.

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The balanced redox reaction is

\(3F(e)_3+ + 2N O^{-2} + 4H_2O\)→ \(3F(e)_2+ + 2N O^{-3} + 4H+\)

Let's start balancing the redox reaction. Here is the given redox reaction:

\(3F(e)_3+ + 2N O^{-2} + 4H_2O\) → \(F(e)_2+ + H+ + N O^{-3}\)

Step 1: Separate the redox reaction into two half-reactions.Half-reaction 1: \(F(e)_3+\)→ \(F(e)_2+\) Half-reaction 2: \(N O^{-2}+ H_2O\) → \(N O^{-3}+ H+\)

Step 2: Balance the elements other than H and O in each half-reaction. Balanced Half-reaction 1: \(F(e)_3+\) →\(F(e)_2+\)Balanced Half-reaction 2: \(N O^{-2} + H_2O\) → \(N O^{-3} + H+\)

Step 3: Balance the oxygen atoms by adding H2O to the side that needs oxygen . Balanced Half-reaction 1: \(F(e)_3+\) → \(F(e)_2+\) Balanced Half-reaction 2: \(N O^{-2}+ H_2O\) →\(N O^{-3} + H+ + H_2O\)

Step 4: Balance the hydrogen atoms by adding H+ to the side that needs hydrogen . Balanced Half-reaction 1: \(F(e)_3+\) → \(F(e)_2+\) + e− + H+Balanced Half-reaction 2: \(N O^{-2} + H_2O + H+ - > N O{-3}+ H+ + H_2O + e^-\)

Step 5: Determine the number of electrons required to balance the half-reaction . Balanced Half-reaction 1: \(F(e)_3+ - > F(e)_2+ + e^{-}+ H+\) [3 electrons are required]Balanced Half-reaction 2: \(N O^{2} + H_2O + H+ - > N O^{-3} + H+ + H_2O + e^-\)[2 electrons are required]

Step 6: Multiply the half-reactions by integers to make the number of electrons equal for both half-reactions.Balanced Half-reaction 1:\(3(F(e)_3+ - > F(e)_2+ + e^{-} + H+\) ).Balanced Half-reaction 2: \(2(N O^{-2} + H_2O + H+ - > N O^{-3}+ H+ + H_2O + e^{-})\)

Step 7: Add the balanced half-reactions together\(3F(e)_3+ + 2N O^{-2} + 4H+ - > 3F(e)_2+ + 2N O^{-3} + 2H_2O\) .The balanced redox reaction is:\(3F(e)_3+ + 2N O{-2} + 4H_2O - > 3F(e)_2+ + 2N O^{-3} + 4H+\)

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The given chemical reaction can be completed with 2 CaO + H₂O =

2Ca( OH)₂ is the complete form.

A process in chemistry in which one or more substances, known as the reactants, are transformed into one or more distinct substances, known as the products. Compounds or chemical elements make up substances.

Combination, decomposition, single-replacement, double-replacement, and combustion are the five fundamental types of chemical reactions. You can classify a reaction into one of these categories by analyzing its reactants and products.

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Answer: Hello, the answer is; Thermal/heat energy is hotness, etc.

Explain: Thermal/heat energy is stoves, ovens, etc.

Thermal energy is sorta like the sun, the planet. Hot water could be considered thermal energy.

For more information about the definition of Thermal/heat energy, I would search up a slide on google.

Answer:

1.91 atm

Explanation:

Step 1: Calculate Henry's constant (k)

A gas has a solubility (C) of 2.45 g/L at a pressure (P) of 0.750 atm. These two variables are related to each other through Henry's law.

C = k × P

K = C/P

K = (2.45 g/L)/0.750 atm = 3.27 g/L.atm

Step 2: Calculate the pressure required to produce an aqueous solution containing 6.25 g/L of this gas at constant temperature.

We have C = 6.25 g/L and k = 3.27 g/L.atm. The required pressure is:

C = k × P

P = C/k

P = (6.25 g/L)/(3.27 g/L.atm) = 1.91 atm

Explanation:

option B is the correct answer, 1.67g/mL.

hope this helps you.

The pressure inside the tire, converted to pascals, is approximately 8,555 N/m^2, or 8.56 × 10^3 Pa, using the appropriate number of significant figures.

To convert the pressure from pounds per square inch (psi) to pascals (Pa), we need to use the given conversion factors:

1 pound = 4.45 newtons

1 inch^2 = 6.45 centimeters^2 = (6.45/100)^2 square meters

First, let's convert psi to newtons per square inch (N/in^2):

28.0 psi * 4.45 N = 124.6 N/in^2

Now, let's convert newtons per square inch to pascals:

124.6 N/in^2 * ((6.45/100)^2) m^2 = 8,555.4125 N/m^2 (approximately)

To express the answer to the correct number of significant figures, we need to determine the number of significant figures in the given pressure value. Since the pressure is given as "28.0," it implies that there are three significant figures. Therefore, the pressure inside the tire, converted to pascals, is approximately 8,555 N/m^2, or 8.56 × 10^3 Pa, using the appropriate number of significant figures.

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Answer:

0.916g/mL is the density of the liquid

Explanation:

Density is defined as the mass of a substance in a determined volume (Usually grams per mililiter).

The only difference between the first and second measurements is the volume of the liquid:

19.7mL - 10.2mL = 9.5mL is the difference in volume of the liquid between first and second weighs.

This volume, 9.5mL, weighs:

58.20g - 49.50g = 8.7g

As density is the ratio between mass in grams and volume in mL:

Density: 8.7g / 9.5mL

Answer:

then use those and set up one

Explanation:

Answer:

the string and the cans for me. its like your own phone

Explanation:

If there is sufficient fossil fuel, we will cope by utilizing it in a responsible and sustainable manner while actively transitioning towards alternative energy sources. Coping with the abundance of fossil fuels requires a multi-faceted approach that considers environmental, economic, and social aspects.

To cope effectively, we can:

1. Promote energy efficiency: Invest in technologies and practices that minimize energy waste and maximize efficiency in all sectors, including transportation, industries, and buildings.

2. Transition to renewable energy: Increase the adoption of renewable energy sources such as solar, wind, hydro, and geothermal power. This reduces our reliance on fossil fuels and mitigates environmental impacts.

3. Implement policy measures: Enact policies that incentivize the use of renewable energy, discourage excessive fossil fuel consumption, and promote sustainable practices.

4. Invest in research and development: Support and fund research efforts aimed at developing cleaner and more sustainable energy technologies, such as advanced battery storage, hydrogen fuel cells, and carbon capture and storage.

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The high melting and boiling point of metals is due to the attraction between the delocalized electrons and the positive ions in metallic bonding.

Metals are mostly hards and shiny solid elements which forms ions by loss of electrons.

Metals are found in group 1, 2 and 3 of the periodic table of elements.

Transition metals are found in the d- and f-block of the periodic table.

The melting and boiling point of transition metals increases as the number of delocalized electrons increases.

Because the positive ions in metals are strongly attracted to the delocalized electrons in the metal, they are not easily removed from the metal causing the metal to be very hard, malleable and ductile.

Alkali metals are more reactive than transition metals because they have only one valence electron per atom

The boiling points of metals vary greatly.

The melting points are not as extreme as the boiling point. It does not take an extreme amount of energy for atoms to be able to move past each other. However, during boiling, atoms must be separated from a group of which requires a lot of energy.

Light absorbed and released by the electrons in a metal accounts for the luster of the metal.

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The balanced reaction equation of the reaction is; 2H2O + O2 → 2H2O2

This is a chemical equation that represents the reaction between water (H2O) and oxygen (O2) to form hydrogen peroxide (H2O2). The coefficients in front of each substance indicate the relative number of molecules involved in the reaction.

Recall that we can balance the reaction equation  by ensuring that the atoms of the elements on both sides of the reaction equation are the same as we have above.

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Answer:

An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result? The first atom emits light with more energy.

Answer:

8

Explanation:

Sodium combines with oxygen to form sodium oxide and sodium combines with Carbon-di-oxide to form sodium carbonate.

When sodium and oxygen combine, they form sodium oxide. The reaction is:

2Na + O₂ → 2Na₂O

Sodium and oxygen combine to form sodium oxide, a white solid with a melting point of 1,132 degrees Celsius. Sodium oxide is a strong base, meaning it can accept protons from other molecules. It is also a very strong oxidizing agent, meaning it can donate electrons to other molecules.

Similarly, Sodium carbonate is formed when sodium and carbon dioxide combine. This reaction is used to make baking soda.

When sodium and carbon dioxide combine, they form sodium carbonate. The reaction is as follows:

2Na + CO₂ -------> Na₂CO₃

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The true statements about a car with constant velocity include the following below:

A. It maintains the same speed

B. It continues in the same direction

E. It has zero acceleration.

This is referred to as a scenario in which an object must have a constant speed in a constant direction.

We should note that any change in direction would automatically change the velocity even if the speed remains constant and the acceleration has to be zero for it to happen thereby making the above options the correct choices.

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V=n/M

V=(6.34:125.55 g/mol)/0.72

V=0.07 L = 70 ml

Answer: 1. Immediately flush the area with lukewarm water for 30 minutes.

2. Remove clothing and jewelry from the affected area.

3.Wait to see if symptoms appear.