CHEMISTRY HIGH SCHOOL

Suggest one reason why hydrogen is called a "clean fuel"

Answers

Answer 1
Answer: Because there is no carbon, CO2 is not a product of its combustion, only water.

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The correct, chemically balanced equation for photosynthesis is: A. 12CO2 + 6H2O + RADIANT ENERGY -> C6H12O6 + 12O2. B. 6CO2 + 12H2O + RADIANT ENERGY -> C6H12O6 + 6H2O + 6O2. C. 12O + C6H12O6 + 6H2O -> 6CO2 +12H2O + ENERGY. D. 12O2 + C6H12O6 + 12H2O -> 6CO2 + 12H2O + ENERGY. E. 6O2 + C6H12O6 + 6H2O -> 6CO2 + 12H2O + ENERGY.
3. Rank each of the following in order of DECREASING atomic radiusa. Cl, Br, Ga

A sample of gas at 25ºc has a volume of 11 l and exerts a pressure of 660 mm hg. how many moles of gas are in the sample?

Answers

  The  moles of  the gas    in the sample  is 0.391  moles

    calculation
by use  of  ideal  gas  equation, that  is Pv=nRT
where  n  is number  of moles
           P(pressure)= 660  mmhg
           R(gas  constant)  =  62.364 l.mmhg/mol.K
           T(temperature)= 25 +273 =   298 k

by  making  n  the subject of the  formula

n= Pv/ RT

n is therefore=   (660mm hg  x11 L)/(  62.364 L.mmhg/mol.k  x298 K)  = 0.391  moles

Amorphous solids do not possess overall order, with individual clusters held together only by Van der Waals forces.TRUE

FALSE

Answers

The answer is true. Amorphous solids, also known as non-crystalline solid, lacks a long-range order seen in a crystalline solid. Examples are glass. polymers and silicon. Many solids around are in an amorphous form.

Answer:

True

Explanation:

Amorphous solid is the designation given to a structure that has no long-range (atomic) spatial ordering, such as regular solids. For a material to be considered as regular solid it must have a defined crystalline structure, which corresponds to a positioning of the atoms that compose it. Amorphous materials have no definite geometric shape, may even have some rigidity like ordinary solids, but their atoms are not in spatial organization (at the microscopic level), in which case amorphous solids have no general order, with individual clusters joined together only. by the forces of Van der Waals.

Why do scientists use different types of models to represent compounds

Answers

Answer is: scientists use different types of model to show different characteristics (chemical properties) of compound.

For example, ball and stick model gives informations about bond lenght and space filling model gives information about space occupied by atoms.

In chemistry, the ball-and-stick model is a molecular model of a chemical substance which is to display both the three-dimensional position of the atoms and the bonds between them.   The atoms are represented by spheres, connected by rods which represent the bonds. Every ball represent one atom in one molecule and they have different colors for different atoms (for example, carbon is black, hydrogen is white, nitrogen is blue).

There also other models: skeletal models, polyhedral models, composite models, computer-based models.
because they are different they all show different  traits

Can someone solve 5 ?

Answers

Please what are we solving for
Is it oxidation number or what?

How many atoms are in 5 moles of CH4

Answers

molar mass CH4 = 12 + 1 . 4 = 16  g/mol

1 mole CH4 ------------ 16 g
5 moles CH4 ---------- x g

x = 5 . 16

x = 80 g


16 g CH4 ------------------ 6,02.10²³ atoms
80 g CH4 ------------------ y atoms

16 . y = 80 . 6.02x10²³

16 y = 4,81.10 ^(25)

y = (4,81.10 ^(25) )/(16)

y = 3,01.10 ^(24) atoms

hope this helps

Which event must always occur for a chemical reaction to take place?(1) formation of a precipitate(2) formation of a gas(3) effective collisions between reacting particles(4) addition of a catalyst to the reaction system

Answers

3 - Effective collisions between reacting particles

For a chemical reaction to occur, reacting particles must collide - however, not all collisions result in a reaction. They must have enough energy in the collision to react (that is, be above the activation energy). The rate of reaction is determined by the rate of successful collisions, that is to say, the more successful collisions there are in a unit time, the faster the reaction rate.
(3) effective collisions between reacting particles is your answer. Without these collisions, the reacting particles cannot trade particles or react with each other to create a chemical reaction.
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