Answer:
B) Rutherford's gold foil experiment
Explanation:
<u>Rutherford's gold foil experiment</u>
Rutherford conducted an experiment in which he took a thin gold particle film on which he passes alpha- particles. He noticed that:
Most of the alpha particles get through the film and can be detected by the detector.
Around small portion of the alpha particle deflected at small angles.
A very very few alpha particle (approximately 1 out of 1 million alpha particles) just retraced their path which means come back from the center.
He concluded that:
Most of the space of the atom is empty and in the center of the atom , there is solid mass which is the cause of the alpha particles to come back. He gave the term nucleus to this solid mass.
Q. No. 1:
a) Endothermic
b) Exothermic
c) Endothermic
d) Exothermic
Q. No. 2:
a) Exothermic
b) Because heat is on product side (evolved to surrounding).
c)
1400 Kj = was produced by 1 mole of C₂H₄
Then,
2100 Kj = will be produced by X moles of C₂H₄
Solving for X,
X = (2100 Kj × 1 mol) ÷ 1400 Kj
X = 1.5 moles of C₂H₄
d)
3 moles of O₂ produced = 1400 Kj of Heat
Then,
1.5 moles of O₂ will produce = X Kj of Heat
Solving for X,
X = (1.5 mol × 1400 Kj) ÷3 mol
X = 700 Kj of Heat
A) Consume food , to obtain chemical potential energy
The molarity of the ammonia solution is 1.38 M
<h3>Definition of molarity</h3>
Molarity is defined as the mole of solute per unit litre of the solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
<h3>Determination of the mole of NH₃</h3>
•Mass of NH₃ = 23.5 g
•Molar mass of NH₃ = 14 + (3×1) = 17 g/mol
•Mole of NH₃ =?
Mole = mass / molar mass
Mole of NH₃ = 23.5 / 17
Mole of NH₃ = 1.38 mole
<h3>Determination of the molarity </h3>
•Mole of NH₃ = 1.38 mole
•Volume = 1 L
•Molarity of NH₃ =?
Molarity = mole / Volume
Molarity of NH₃ = 1.38 / 1
Molarity of NH₃ = 1.38 M
Learn more about molarity:
brainly.com/question/9468209
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Water is always on the move. Rain falling today may have been water in a distant ocean days before. And the water you see in a river or stream may have been snow on a high mountaintop. Water is in the atmosphere, on the land, in the ocean, and underground. It moves from place to place through the water cycle.
Where's the water?
There are about 1.4 billion km3 of water (336 million mi3 of water) on Earth. That includes liquid water in the ocean, lakes, and rivers. It includes frozen water in snow, ice, and glaciers, and water that’s underground in soils and rocks. It includes the water that’s in the atmosphere as clouds and vapor.
If you could put all that water together – like a gigantic water drop – it would be 1,500 kilometers (930 miles) across.