If 456 kJ of heat is absorbed to change oxygen from a solid to a liquid, how many grams of oxygen were there?



AH fus=0. 44 kJ/mol


AHvap=6. 82 kJ/mol

Answer:

forms/types

Explanation:

The number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

To determine the number of molecules in a 37.93 gram sample of magnesium nitrate, you would need to know the molar mass of the compound. Magnesium nitrate has a molar mass of 148.31 g/mol.

we can use the formula:

Number of moles = mass (in grams) / molar mass (in g/mol)

Number of moles = 37.93 g / 148.31 g/mol = 0.2568 mol Avogadro's number (6.022x10^23) is the number of atoms, ions, or molecules in one mole of a substance. Therefore, the number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

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The food chain is a series of organisms that depend on one another for food. In this case, the plant is the primary producer, the lizard is the primary consumer, the snake is the secondary consumer, the owl is the tertiary consumer, and the jaguar is the apex predator. The plant is the base of the food chain and the source of energy for all the other organisms in the chain.

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Number of particles : 8.603 x 10²³

Standard conditions for temperature and pressure are used as a reference in certain calculations or conditions

Assumption⇒ Standard Conditions

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

1 mol = 6.02 x 10²³ particles (atoms, ions, or molecules)

32.0 liters of Helium

\(\tt mol=32:22.4=1.429\)

Number of particles :

\(\tt 1.429\times 6.02\times 10^{23}\\\\=8.603\times 10^{23}\)

The intermolecular interactions between water molecules are greater than those between ammonia molecules.

In a certain state of matter, substances are bound together by intermolecular forces. Three different states of matter exist;

Solid, sLiquid, sGas .

The level of intermolecular contact between molecules is greatest when matter is solid. Liquid states have weaker intermolecular interactions, while gaseous states have the weakest intermolecular contacts.

Since ammonia is a gas at room temperature, its molecules interact with one another less strongly than those of water at the same temperature.

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4, 3, 1

Explanation:

Sb has four on the right, so it needs four on the left. It's all alone, so 4.

O2 comes in pairs, so you only need 3 of those to get six oxygens.

And 1 is the place holder for the right side since we got the left to match perfectly.

The volume of the piece of iron to the nearest cubic centimeter is 4473.6 cubic centimeter.

density = mass / volume

volume = mass/ density

            =35342/ 7.9

            =4473.6 cubic centimeter

The density of a substance indicates how dense it is in a given area. Mass per unit volume is the definition of a material's density. In essence, density is a measurement of how closely stuff is packed. It is a particular physical characteristic of a specific thing. The Greek scientist Archimedes made the discovery of the density principle. If you are familiar with the formula and the relevant units, calculating density is simple. The letter D can also be used to signify density instead of the symbol.

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Answer:

Neutrons

Explanation:

Protons have a positive (+) charge.

Electrons have a negative (-) charge.

Neutrons have a neutral (0) charge.

Answer: neutrons

The components of an atom that have no charge are neutrons. Neutrons have a neutral charge, which means it has no charge. It is not positive or negative. The answer is neutrons.

Answer:

H is the letter for heat

Answer:  Shaun must consume 6 more g of protein to reach the required amount.

Explanation:

Given : Recommended amount of protein = 200 calories

Now 4 calories = 1 gram of protein

Thus 200 calories = \(\frac{1}{4}\times 200=50\) g of protein.

Calories consumed per day by Shaun = 176 calories

176 calories =  \(\frac{1}{4}\times 176=44\) g of protein.

Thus Shaun need to consume = (50-44) g = 6 of protein to reach the required amount.

Shaun must consume 6 more g of protein to reach the required amount.

Answer:

The volume of the 0.76 M NaCl solution containing 0.35 g of NaCl is approximately 7.89 mL.

Explanation:

To solve this problem, we need to use the relationship between the amount of solute (in moles), concentration (in molarity), and volume (in liters):

amount of solute (in moles) = concentration (in M) x volume (in L)

First, let's calculate the amount of NaCl in moles using the given mass and molarity:

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = 0.35 g / 58.44 g/mol (molar mass of NaCl)

moles of NaCl = 0.005992 mol

Next, we can use the above equation to solve for the volume of the solution:

0.005992 mol = 0.76 M x volume (in L)

volume (in L) = 0.005992 mol / 0.76 M

volume (in L) = 0.00789 L or 7.89 mL (rounded to three significant figures)

Therefore, the volume of the 0.76 M NaCl solution containing 0.35 g of NaCl is approximately 7.89 mL.

Answer: 340°C

Explanation: To calculate the temperature we have a formula:

                                      q=mcΔT-------------(1)

Given that q=2.50kJ

                  m=22.0g

                   c=0.385J/g°C

                    T1=45°C

ΔT=change in Temperature(T2-T1)

Now calculate the temp substitute these values in  euation(1)

                    2.50= (22.0*0.385)(x-45)

                      2.50 = 8.47(T2-45)

                     2.50=8.47T2-381  

                      T2=340°C

Hence,the final temperature of cu ic 340°C

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Answer:

B. Charges ( a slight positive charge on one end, and a slight negative charge on the other).

\(\\ \rm\longmapsto Distance=Speed(Time)\)

\(\\ \rm\longmapsto Distance=25(2700)\)

\(\\ \rm\longmapsto Distance=67500m\)

The object travelling at 25 m/s, will travel a distance of 67500 m in 45 mins.

1 min = 60 s

Therefore,

45 mins = 45 × 60

Time = 2700

Speed = 25 m/s

Distance = speed × time

Distance = 25 × 2700

Therefore, the object will cover a distance of 67500 m in 2700 s (i.e 45 mins)

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Silver chloride produced : = 46.149 g

Limiting reagent : CuCl2

Excess remains := 3.74 g

Reaction

silver nitrate + copper(II) chloride ⇒ silver chloride + copper(II) nitrate

Required

silver chloride produced

limiting reagent

excess remains

Solution

Balanced equation

2AgNO3 (aq) + CuCl2 (s) → 2AgCl(s) + Cu(NO3)2(aq)

mol AgNO3 :

= 58.5 : 169,87 g/mol

= 0.344

mol CuCl2 :

=21.7 : 134,45 g/mol

= 0.161

mol ratio : coefficient of AgNO3 : CuCl2 :

= 0.344/2 : 0.161/1

= 0.172 : 0.161

CuCl2  as a limiting reagent

mol AgCl :

= 2/1 x 0.161

= 0.322

Mass AgCl :

= 0.322 x 143,32 g/mol

= 46.149 g

mol remains(unreacted) for AgNO3 :

= 0.344-(2/1 x 0.161)

= 0.022

mass AgNO3 remains :

= 0.022 x 169,87 g/mol

= 3.74 g

The light bulb will take approximately 2.9 x 10² seconds to consume 2.30 x 10² joules of energy.

To calculate the time it takes for the light bulb to consume a given amount of energy, we can use the formula:

Time (in seconds) = Energy Consumed / Energy Consumption Rate

Given that the energy consumption rate of the light bulb is 80.0 joules per second, and we want to find the time it takes for the light bulb to consume 2.30 x 10² joules of energy, we can substitute these values into the formula:

Time = (2.30 x 10² joules) / (80.0 joules per second)

Time = 2.875 x 10² seconds

Time ≈ 2.9 x 10² seconds

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When a high voltage is applied to a tube filled with hydrogen gas, the gas emits a pinkish glow. This glow is the result of the excitation and de-excitation of hydrogen atoms. Specifically, when an electron is excited from its ground state to a higher energy level, it gains energy and moves farther away from the nucleus. When it falls back down to a lower energy level, it releases the extra energy as light.

One way to explain this behavior is using the Bohr model of the atom, which proposes that electrons orbit the nucleus in discrete energy levels. In this model, the energy of an electron is proportional to its distance from the nucleus, and electrons can only occupy certain energy levels. When an electron is excited by the high voltage in the tube, it jumps to a higher energy level.

When it falls back down, it emits a photon of light with a specific energy corresponding to the difference in energy between the two levels. The observed spectrum of light emitted by hydrogen in gas discharge tubes is consistent with the energy differences predicted by the Bohr model.

Another way to explain the behavior of hydrogen in gas discharge tubes is using the quantum mechanical model of the atom. This model proposes that electrons are not confined to specific orbits but instead exist as a probability cloud around the nucleus. In this model, the energy of an electron is quantized, meaning it can only take on certain discrete values. When an electron is excited in this model, it transitions to a higher energy state and emits a photon when it returns to a lower energy state.

Overall, both the Bohr model and the quantum mechanical model can explain the behavior of hydrogen in gas discharge tubes. The experimental evidence, such as the observed spectrum of light emitted by hydrogen, is consistent with both models. However, the quantum mechanical model provides a more detailed and accurate description of the behavior of electrons in atoms.

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A mineral is a naturally occurring inorganic solid element or compound. It can have different properties that depend on its chemical composition and crystal structure.

A mineral can be classified as either extrusive or intrusive and may consist of interlocking or bonded grains of matter. Sand grains that are cemented together to form rocks are not considered minerals. A mineral is a naturally occurring inorganic solid element or compound. It can have different properties that depend on its chemical composition and crystal structure. A mineral can be classified as either extrusive or intrusive and may consist of interlocking or bonded grains of matter. Extrusive minerals are formed on the earth's surface from molten lava that has cooled and solidified. Extrusive minerals have a fine-grained texture because they cool quickly on the surface. Intrusive minerals are formed beneath the earth's surface from molten magma that has cooled and solidified. Intrusive minerals have a coarse-grained texture because they cool slowly beneath the surface. The interlocking or bonded grains of matter in a mineral are called crystals. The crystals in a mineral are arranged in a repeating pattern that gives the mineral its characteristic shape and structure. The properties of a mineral, such as color, luster, and hardness, depend on the chemical composition and crystal structure of the mineral. Minerals are important in our daily lives and are used in many industries such as construction, electronics, and jewelry making. For example, quartz is used in electronics because of its piezoelectric properties, which allow it to convert electrical energy into mechanical energy. Calcite is used in construction because it is a common constituent of cement and concrete. Diamond, the hardest mineral, is used in jewelry making because of its brilliance and durability.

In conclusion, a mineral is a naturally occurring inorganic solid element or compound that can be classified as either extrusive or intrusive and may consist of interlocking or bonded grains of matter. The properties of a mineral depend on its chemical composition and crystal structure. Minerals are used in many industries and are important in our daily lives.

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The statement that "there are many types of energy" is correct. Energy is a fundamental concept in science and refers to the ability of a system to do work or cause a change. There are many different types of energy, each with its own characteristics and properties.

One of the most familiar forms of energy is light energy, which is produced by the sun and other sources of radiation. Sound energy is another form of energy that is produced by vibrations in matter, and it can be detected by the human ear. Thermal energy is the energy associated with the temperature of an object, and it is related to the movement of atoms and molecules within that object.

Chemical energy is stored in the bonds between atoms and molecules, and it is released during chemical reactions. Electrical energy is associated with the movement of electrons through a conductor, and it is used to power many of the devices we use every day. Other forms of energy include nuclear energy, gravitational energy, and kinetic energy.

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Answer:

D

Explanation:

In the Rb atom the valence electron is farther from its nucleus than the valence electron of Li is from its nucleus

Answer:

oxygen shows 2 bonds with hydrogen

Answer:

Electron

Explanation:

Note that the experiment described is the Rutherford Scattering Experiment invented by Ernest Rutherford for simulating alpha particle dispersion. See the procedure below.

Students might use the above contraption to simulate alpha particle dispersion by rolling the marble down the moveable slope towards the circular weight placed on the huge sheet of lined paper.

The scattering of alpha particles can be studied by measuring the angle of deflection using a protractor.

The significance of this experiment is that it contributes to our understanding of subatomic particle behavior, notably how alpha particles disperse when they contact with other particles. See a clearer image attached.

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Answer:

A. Hydrosphere

Explanation:

Hydro means water and dolphins swim in water.

I hope this helps :)

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Edible mushrooms: Consuming edible mushrooms is safe and provides health advantages like fiber, vitamins, and minerals.

Non-Edible mushrooms: Mushrooms that cannot be eaten could be harmful or have unappealing flavors and textures that could be harmful if consumed.

The Delta system describes fatty acids in relation to the Carboxyl  end of the carbon chain and indicates the location of the double bonds.

Four wires make up the Delta configuration: three hot conductors and one ground conductor. The connection is established from one winding end to the starting end of the other, establishing a closed circuit, and the phase loads (such as motor windings) are connected to each other in the shape of a triangle.

The three phases are joined in a triangle-like fashion in the delta arrangement. They typically don't have a neutral cable. With a Y configuration, the phase voltage is equal to the line voltage divided by root 3 (sqrt(3) = 1.732), whereas in a Delta configuration the phase voltage is equal to the line voltage.

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The photo shows the mineral calcite which upon reaction with dilute acid produce carbon dioxide gas. This gas is evolved out as bubbles.

Minerals are naturally occurring inorganic compounds with a definite composition and sharp edged crystalline structures. There are a number of mineral depositions in the nature made of calcium, phosphorous, sodium etc.

Calcite is a mineral made of calcium carbonate. Calcium carbonate is very abundant and essential mineral in the earth crust. When calcium carbonate reacts with mineral dilute acids, it gives carbon dioxide gas.

The reaction with HCl is given here:

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The image related to the question is given below:

\(\rm CaCO_{3} + 2HCl \rightarrow CaCl_{2} + H_{2}O + CO_{2}\)

The release of carbon dioxide gas is appearing as bubbles. Hence, the mineral is calcite.

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Answer:

When two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.