How many calories of heat were added to 167.9 g of water to raise its temperature from 25oC to 55oC?

Answer:

The effects of each kind of radiation is different on the molecules.

Explanation:

Microwave causes molecules that have two opposing poles to spin rapidly due to absorption of the electromagnetic radiation waves. When molecules absorb Infrared radiation, changes occur from a ground vibrational state to an excited vibrational state. When the visible light is absorbed by molecule, the electron is excited and goes to an orbital of higher energy than the lower energy. Ultraviolet radiation turns the stable molecule into a reactive species.

Answer:

kenetic

Explanation:

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Answer:

A

Explanation:

The strength of the gravitational force between two objects depends on mass and distance. The object with the greatest mass would be the car.

Answer:

Red Super Giants

Explanation:

Beacuse of the of their size, the core temperature is more hotter then White Dwarfs and Red Giants.

Answer:

Red Super Giants

Explanation:

Their core is the hottest.

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Answer:

the nucleus

Explanation:

He proposed that the mass of an atom is concentrated in the nucleus which occupies a small volume in the center .He added that the nucleus comprises the protons and neutrons.where the neutron had no charge while the protons had charge of +1

Answer:

the nucleus

Explanation:

Answer:

23.8g of sodium phosphate are formed

Explanation:

Based on the reaction of sodium, Na, with phosphoric acid, H₃PO₄:

3Na + H₃PO₄ → Na₃PO₄ + 3/2 H₂

3 moles of sodium produce 1 mole of sodium phosphate

To solve this question we must find the moles of sodium in 10g. Using the chemical reaction we can find the moles -And the mass- of sodium phosphate produced, as follows:

Moles Na -Molar mass: 22.99g/mol-

10g * (1mol / 22.99g) = 0.435 moles Na

Moles Na₃PO₄:

0.435 moles Na * (1mol Na₃PO₄ / 3mol Na) = 0.145 moles Na₃PO₄

Mass Na₃PO₄ -Molar mass: 163.94g/mol-

0.145 moles Na₃PO₄ * (163.94g/mol) =

Answer:

[tex]M_{acid}=3.57M[/tex]

Explanation:

Hello there!

In this case, since this acid-base neutralization is performed in a 1:2 mole ratio of acid to base as the former is a diprotic acid (two hydrogen ions in the molecule), we can write the following equation:

[tex]2M_{acid}V_{acid}=M_{base}V_{base}[/tex]

In such a way, we can solve for the molarity of the acid, given the molarity and concentration of the NaOH base and the volume of the acid:

[tex]M_{acid}=\frac{M_{base}V_{base}}{2V_{acid}}[/tex]

Thus, we plug in the given data to obtain:

[tex]M_{acid}=\frac{38.70cm^3*1.90M}{2(10.30cm^3)} \\\\M_{acid}=3.57M[/tex]

Best regards!

Answer:

a

Explanation:

A actual molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

Answer:

B.

Explanation:

Answer:

2.7 atm = 2052 torr

I hope this helps you.

Answer:

2052 torr

Explanation:

Multiply 2.7 atm by the conversion factor to torr which is 760 torr = 1 atm

Answer:

The mass of the solution is 140 grams.

Explanation:

The mass of the solution is given by the sum of the solute's mass and the solvent's mass:

[tex] m_{sol} = m_{ste} + m_{svt} [/tex]

Where:

[tex] m_{sol} [/tex]: is the mass of the solution

[tex]m_{ste}[/tex]: is the mass of the solute

[tex]m_{svt} [/tex]: is the mass of the solvent

The solute is the salt (40.0 g) and the solvent is the water (100 g), so:

[tex] m_{sol} = m_{ste} + m_{svt} = 40 g + 100 g = 140 g [/tex]

Therefore, the mass of the solution is 140 grams.

I hope it helps you!          

Answer:

welding torch fuel  

Explanation:

Alkenes are chemical compounds formed by a carbon atom and a hydrogen atom. They have an open chain with double bonds between two carbon acts. They are widely used in the composition of fuels, such as welding torch fuel and have as main characteristics the solubility in solvents, the insolubility in water, high melting and boiling point and the absence of colors.

Welding torch fuel is composed of alkenes. The alkenes comprise a series of compounds that are composed of carbon and hydrogen atoms with at least one double bond in the carbon chain.

Alkenes are a homologous series of hydrocarbons that contain a carbon-carbon double bond.

The number of hydrogen atoms in an alkene is double the number of carbon atoms, so they have the general formula [tex]C_nH _2 _n[/tex].

For example, the molecular formula of ethene is [tex]C _2 H _4[/tex] , while for propene it is [tex]C _3 H _6[/tex].

Alkenes are chemical compounds formed by a carbon atom and a hydrogen atom.

They have an open chain with double bonds between two carbon acts.

They are widely used in the composition of fuels, such as welding torch fuel and have as main characteristics the solubility in solvents, the insolubility in water, high melting and boiling point and the absence of colors.

Hence, the Welding torch fuel is composed of alkenes.

Learn more about the alkenes here:

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Answer:

Q = 63.9 kJ

Explanation:

Given that,

Mass of ice, m = 300 g

We need to find the heat needed to heat the given amount of ice at -5.00°C into steam at 100.°C

The specific heat of ice, c = 2.03 J/g °C

The formula for heat needed is given by :

[tex]Q=mc\Delta T\\\\Q=300\times 2.03\times (100-(-5))\\\\Q=63945\ J\\\\Q=63.9\ kJ[/tex]

So, 63.9 kJ of heat is needed.

Answer:

Heat  gained by 1.25 grams of ice is 250 joules

Explanation:

As we know

[tex]Q = mc\Delta[/tex]T

Where

[tex]\Delta[/tex]T is the change in temperature

Water freezes at 273.15 K/0 degree Celsius, and it boils at 373.15 K/00 degree Celsius,

[tex]\Delta[/tex]T  

m is the mass in grams

c is the specific heat of water (ice) = 2.05 joules/gram

Substituting the given values, we get -

[tex]Q = 1.25 * 2.0 * 100\\Q = 250[/tex]Joules.

Answer:

Today has the highest composition of greenhouse gases

Explanation:

Greenhouse gases have been linked to the rise in the temperature of the earth. they are believed to trap infrared ray close to the earth surface thereby causing a steady rise in the temperature of the earth, a phenomenon that has been widely called global warming.

The concentration of greenhouse gases in the atmosphere today ranks highest among other ages due to anthropogenic activities.

During the ice ages, the concentration of greenhouse gases was slightly higher (especially C02) due to natural feedback mechanisms and not due to anthropogenic activities.

Answer:

You must add 48.97 mL of water to make the 0.200 M diluted solution.

Explanation:

In chemistry, dilution is the reduction in concentration of a chemical in a solution. In other words, it is the process of reducing the concentration of solute in solution, simply adding more solvent to the solution.

In a dilution, the quantity or mass of the solute is not changed but only that of the solvent. As only solvent is being added, by not increasing the amount of solute the concentration of the solute decreases.

The expression for the dilution calculations is:

Cinitial* Vinitial = Cfinal* Vfinal

In this case:

Replacing:

12 M*0.830 mL= 0.200 M*Vfinal

Solving:

[tex]Vfinal=\frac{12 M*0.830 mL}{0.200 M}[/tex]

Vfinal= 49.8 mL

Since 0.830 mL is the volume you initially have of HCl, the amount of water you must add is:

49.8 mL - 0.830 mL= 48.97 mL

You must add 48.97 mL of water to make the 0.200 M diluted solution.

Answer:

Graphene is made of pure carbon.

Explanation:

It is a material in which the carbon atoms are arranged in a single layer, creating a honeycomb pattern. It should be stressed that this layer of carbon is only one atom thick, although some authors consider up to ten layers of carbon to be graphene.

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Answer: Carbon-14 decays quickly leaving the amount too small to measure.

Explanation:

Answer:

b

Explanation:

i did it

Answer:

Answers 1. An amide linkage between the carboxyl group of one amino acid and the amine group of the other amino acid. 2. An ester is a compound formed from the reaction of a carboxylic acid and an alcohol. ( I apologise, I cant figure out number 3.. )

Answer:

Both the Earth and Venus show the appearance of igneous rocks due to the cooling of the magma.

Explanation:

As we know, ignea rock is the first step in the transformation of rocks. This rock is formed by the overflow of terrestrial magma which, upon cooling, turns into ignea rock, which will undergo metamorphism and transform into metamorphic rock, which will continue to undergo metamorphosis until it becomes the other rocks that complete the rock cycle. This is a terrestrial process that can be found on Venus, which also presents the cooling of magma in the formation of ignea rock, which will undergo metamorphism, transforming into other rocks, the way it occurs on Earth.

Answer:

66.8

Explanation:

Calculate that is what I did.

have a good day!

Answer:

H₂

Explanation:

To solve this question we must find, as first, find the molar mass of the homonuclear diatomic gas using Graham's law. With the molar mass we can identify this gas

Graham's law:

[tex]\frac{V_a}{V_b} =\sqrt{\frac{m_B}{m_A} }[/tex]

Where V is the speed of the gases and m the molar mass of those:

As Va is 3.98 times Vb (And mB is molar mass of oxygen gas = 32g/mol)

[tex]3.98 =\sqrt{\frac{32g/mol}{m_A} }[/tex]

15.84 = 32g/mol / mA

mA = 2.02g/mol

As is a homonuclear diatomic gas, the molar mass of the atom is 1.01g/mol. Thus, the gas is:

Answer:

Wavelength (D)............

Answer:

A

Explanation:

the amplitude is measured from the dotted line to the top of the crest. Looking at the picture the amplitude gets smaller

Answer:

g x 334 J/g = 3340J or 3.34kJ.

Explanation:

The energy required for one gram of a solid to melt without experiencing any temperature change is known as the heat of fusion. 3.34 KJ of energy is released.

The most typical illustration is when solid transforms into liquid water. The molecules within the substance become less structured as a result of this process, which is also known as melting or heat of fusion.

The change in enthalpy ( H ) that occurs when a substance transforms from a solid to a liquid state.

The amount of energy required for one gram of a liquid to evaporate (boil) without a change in pressure is known as the heat of vaporization.

Q = gram × 334 J / g

= 3.34 KJ

Thus, at 0°C when 525 KJ of energy  released is 3.34 KJ.

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Answer:

A = 349 g.

Explanation:

Hello there!

In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:

[tex]A=Ao*exp(-kt)[/tex]

We can firstly calculate the rate constant given the half-life as shown below:

[tex]k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{58year}=0.012year^{-1}[/tex]

Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:

[tex]A=500g*exp(-0.012year^{-1} *30year)\\\\A=349g[/tex]

Regards!

Answer:

B. Revolution is a planet's movement around the sun causing four seasons the occur. Rotation is the spinning of the planet on its axis causing day and night.

Answer:  Molarity of the solution is 0.813 M.

Explanation:

Given : Mass of NaOH = 97.68 g

Volume of solution = 3 L

The molar mass of NaOH is 39.99 g/mol. Hence, moles of NaOH are calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{97.68 g}{39.99 g/mol}\\= 2.44 mol[/tex]

Molarity is the number of moles of solute present in a liter of solution. Therefore, molarity of given solution is calculated as follows.

[tex]Molarity = \frac{no. of moles of solute}{Volume (in L)}\\= \frac{2.44 mol}{3 L}\\= 0.813 M[/tex]

Thus, we can conclude that molarity of the solution is 0.813 M.