What is the mass of a sample of glass (specific heat= 0. 50 J/goC), if it requires 490 J of heat to raise the temperature from –18. 0oC to 0. 0oC?

Answer:

CFCs

Explanation:

When CFCs come into contact with sunlight, they divide into molecules. One of those molecules is chlorine, which destroys the ozone.

Answer:

emitting or relating to the emission of ionizing radiation or particles

Explanation:

Radiation can damage the DNA in our cells.

In other words!

the giving off of rays of energy or particles by the breaking apart of atoms of certain elements (as uranium)

Answer:

10 + 3/4   = 10 3/4   units     ( inches <==== I think)

Explanation:

Answer:

A

Explanation:

did this before

The mass in grams of He are necessary to fill a balloon having a volume of 4.50×10³ mL to a pressure of 1.14×10³ torr at 25.0ºC is 1.104 grams.

Mass (W) in grams from moles (n) will be calculated by using the below equation:
n = W/M, where

M = molar mass

Moles of helium gas will be calculated by using the ideal gas equation:

PV = nRT, where

R = universal gas constant = 62.363 L.torr / K.mol

P = pressure of gas = 1.14×10³ torr

V = volume of gas = 4.50×10³ mL = 4.50 L

n = moles of gas = ?

T = temperature = 25.0ºC = 298 K

On putting these values on the ideal gas equation, we get

n = (1140)(4.5) / (62.363)(298) = 5130 / 18584

n = 0.276 moles

Now we convert this moles into mass by using the first equation as:

W = (0.276mol)(4g/mol) = 1.104 g

Hence required mass of helium gas is 1.104 grams.

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Answer:

because they are ionic bonded

Answer:

C

Explanation:

Releases Ink!

Answer: I'm pretty sure the squid releases a spray of ink

Explanation: I've seen it in movies

Answer:

Its the last one freezing and condensation.

Explanation:

because the line is moving up so it has to be freezing and if it was going down it would have been melting

Given what we know, we can confirm that based on the evidence found, someone deliberately set fires at different points around the warehouse.

This has to do with the natural way in which fires spread. Fires that occur naturally or accidentally tend to concentrate in one place, then spread throughout the warehouse over time, however, this is not what the detective found. Instead, there are indications that multiple fires started simultaneously.

Therefore, given the very unlikely nature of this occurring naturally, we can confirm that based on the evidence found, someone deliberately set fires at different points around the warehouse.

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Answer:

absorb

Explanation:

Endothermic reactions absorb energy ....usually feel cold

Answer:

D. Extremely high pressure

B. Unusally high oxygen Levels

Sorry about that

becasue there is not ice on the bottum of the ocean it is really hot and unever terran it becasue of big rock forming together they all ready figurd that out

Hope This Helps

Answer:

D and B

Explanation:

Answer: 9514 1404 393

 4 2/3 ohms

The resistance is the ratio of voltage to current.

 R = V/I

 R = (14)/(3) = 4 2/3 . . . ohms

Explanation:hi ^^ have a great day hope this helps xlXCherryColaXlx (nice pfp btw)

Answer: 0.962 M

Explanation:

molarity = (moles of solute)/(liters of solution) = 27.7/28.8 = 0.962 M

Answer:

The change of state requires energy.

Explanation:

Instead of the energy changing the temperature the heat energy is used by changing its form.

The temperature of the wind as that decreases the volume and the pressure of the balloon to the given values is 14.09°C.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

We substitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

( 0.980atm × 14.5L )/293.15K = ( 0.973684atm × 14.3L )/T₂

14.21Latm / 293.15K = 13.92368Latm / T₂

14.21Latm × T₂ = 13.92368Latm × 293.15K

14.21Latm × T₂ = 4081.72679LatmK

T₂ = 4081.72679LatmK / 14.21Latm

T₂ = 287.24K

T₂ = 14.09°C

Therefore, the temperature of the wind as that decreases the volume and the pressure of the balloon to the given values is 14.09°C.

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Answer:

2 i think should be the correct answer

Explanation:

130 ppm will contain  0.12985167 grams of chlorine present in per liter of pool water.

This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L).

1001.142303 ppm is equal to 1 g/L

So, 130 ppm will contain  [tex]\frac{130}{1001.142303}[/tex] grams of chlorine present in per liter of pool water which is equal to 0.12985167 gram/L.

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Answer:

2Mg + O2 ⇒ 2MgO

Answer: the gas molecules interact with one another

Explanation:

According to the forces of attraction, the  gas molecules interacting  with one another makes a gas non - ideal.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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In the given chemical reaction iron is less electropositive metal and aluminum is more electropositive and behave as a reducing agent also.

Electropositivity is the ability of an atom of donation or losing of electrons easily.

From the given chemical reaction it is clear that oxidation state of iron changes from +3 to 0 & of aluminum is from 0 to +3. So in the above chemical reaction aluminum is more electropositive than iron metal. And aluminum is behave as a reducing agent as it helps in the reduction process by providing electrons.

Hence aluminum is electropositive metal and reducing agent, iron is less electropositive.

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Answer:

this is a food chain in ecosystem

Answer:

this is a food chain in ecosystem

Explanation:

hope this helps

When the speed of the particle is close to that of light, it's observed mass would be infinitely large.

To answer the question, we need to know what observed mass is.

This is the mass the body of an object in relativistic motion appears to have.

So, observed mass, m' = m/√(1 - β²) where

Now, since the speed of the particle is close to that of light, β ≅ 1.

So, m' = m/√(1 - β²)

m' = m/√(1 - 1²)

m' = m/√(1 - 1)

m' = m/√0

m' = m/0

m' = ∞

So, when the speed of the particle is close to that of light, it's observed mass would be infinitely large.

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Answer:

C I think

Explanation:

A duck isn't supposed to bring a sandwich to people, so i believe that the duck learned how to do that. (Sorry if it's wrong)

Answer:

weakness, There are two conditions that lead to a weak volcanic eruption, low viscosity magma and little presence of trapped gases.

strength, The VEI or (Volcanic Explosivity Index)  is a scale that describes the size of explosive volcanic eruptions based on magnitude and intensity. The numerical scale (from 0 to 8) is a logarithmic scale, and is generally analogous to the Richter and other magnitude scales for the size of earthquakes.

Explanation:

i really hope this helps. :)

Answer:

The answer should be A. the mechanism will provide defense against many different types of pathogens :)

Have an amazing day!!

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Answer: 0.37 M

Explanation:

HCl has a gram-formula mass of 36.46 g/mol, so 40.0 g is about 40.0/36.46=1.10 mol.

This means that since molarity = (moles of solute)/(liters of solution), the answer is 1.10/3.0 = 0.37 M

If the change in Gibbs free energy for a process is positive, the corresponding change in entropy for the universe will be positive.

This is defined as the energy used by a substance involved in a chemical reaction.

The Gibbs free energy and entropy has a direct relationship which is why a positive gibbs free energy will result in a corresponding positive entropy.

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Answer: The correct answer is Negative

Answer: 44.0 g/mol

Explanation:

[tex]M=m.RT/PV[/tex]

M=1.211*0.082*296/ 0.987*0.677

M= 44 g/mol

A gas collected from a reaction has a mass of 1.211 g and occupies a volume of 0.677 L. The temperature in the laboratory is 296 K, and the air pressure is 0.987 atm  the molar mass of the gas 23.7 g/mol. option A is correct.

The universal gas law given by Boyle, Charles , Avogadro and Gauss known as combined gas law with respect to temperature, volume and pressure using universal gas constant and number of moles.

According to universal gas equation or combined gas equation

          P V = n R T

where , P = pressure

             V = volume

              n = number of moles

              R = universal gas constant = 8.313

               T = temperature

n = W / M.M

W = weight

M.M = molar mass

substituting the value in the equation

0.987 × 0.677 = 1.211 / M.M × 8.313 × 296

M.M = 23.7 g/mol

Therefore, gas collected from a reaction has a mass of 1.211 g and occupies a volume of 0.677 L. The temperature in the laboratory is 296 K, and the air pressure is 0.987 atm  the molar mass of the gas 23.7 g/mol. option A is correct.

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Answer:

Empirical Formula ClHgO3 Mercurous Chlorate

Explanation:

Cl=12.48% Hg=70.62% O=16.9%