Explanation:
this is a chemistry question ???
anyway, it is clearly A, as seatbelts try to counteract the inertia a moving body (our bodies riding in a car) has, when the environment (the car) of this body is suddenly coming to a stop.
this inertia would otherwise try to move the body still forward resulting in a headfirst crash into and often through the windshield. which causes much more damage to the body than the bruises caused by the pressure of the seatbelts against the body counteracting the body's inertia.
but also clearly, all 3 laws play a role.
the force with which the moving body has to deal when smashing into the windshield and potentially then other objects outside the car is described by the second law.
and for any action (crash) there are corresponding reactions (like the conversion of the crash energy into some absorbing reaction : damaged soft and hard tissue in the human body, crumbled car bodies,...).
Answer:
A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly
12 grams of carbon-12 (i.e., 6.023 X 1023).
Explanation:
Answer:
Option B: cooling as the lava runs down the mountain
Explanation:
The point R is basically at near the Earth's surface.
Now, we are told that rocks melt underground to form magma. This is a process of formation of igneous rocks. So, in formation of igneous rocks another process that will contribute to formation of rocks at point R is named cooling.
Cooling is a process where the larva runs down the mountain that makes magma hardened and makes it it turn into igneous rock.
Answer:
9.15×10²³molecules
Explanation:
moles=number of particles/Avogadro's number
1.52=x/6.02×10²³
by cross multiplication;
x=1.52×6.02×10²³
=9.15×10²³
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Answer is: the mass of the carbon is 14.57 grams.
m(H) = 2.45; mass of hydrogen in sample of acetone.
n(H) = m(H) ÷ M(H).
n(H) = 2.45 g ÷ 1.01 g/mol.
n(H) = 2.425 mol; amount of hydrogen.
From molecular formula of acetone: n(C) : n(H) = 3 : 6 (1 : 2).
n(C) = 2.425 mol ÷ 2.
n(C) = 1.212 mol; amount of carbon in the sample.
m(C) = n(C) · M(C).
m(C) = 1.212 mol · 12.01 g/mol.
m(C) = 14.57 g.
