Answer:
B. 6.3 × 10² J
Explanation:
The formula for work (w) done is
w = f×d
f = 70 N
d = 10 m
w = 70 × 10
w = 700 J = 7 × 10² J
w is <em>positive</em> because work is being done on the object.
Answer:
The first step in the free radical mechanism for the preparation of polyethylene is:
b. heating an organic peroxide to break the O-O bond
Explanation:
The preparation of ethylene occur by free radical mechanism , which occurs in three steps :
1. Chain Initiation
2. Chain propagation
3. Chain termination.
The first step i.e chain initiation require a radical. The compound are generally peroxide(O-O linkage) that produce radical is :
Benzoyl Peroxide
This compound when heated (with U.V radiation) produce two species of radicals .
(see the attached image)
These RADICALS are highly unstable and very reactive in nature.
They readily react with ethene and initiate the polymerisation.
Thus,
The first step in the free radical mechanism for the preparation of polyethylene is:
b. heating an organic peroxide to break the O-O bond
<u><em>The sequence of Polymerisations are:</em></u>
b. heating an organic peroxide to break the O-O bond
d. propagation of the free radicals
Mghcl14 + H2 = mghclh 16 work needed to solve this problem
Answer:
In case of low-mass stars,the outer layers of the low mass stars are expelled as the core collapses such that the outer layers form a planetary nebula.
Explanation:
In case of low-mass stars,the outer layers of the low mass stars are expelled as the core collapses such that the outer layers form a planetary nebula. The core remains as a white dwarf and finally become a black dwarf as it cools down. A low mass star consumes its core hydrogen and turns it into helium over its lifetime.
Answer:
Nanomachines will work with atoms, not nuclei. The smallest unit of a chemical element, about a third of a nanometer in diameter. Atoms make up molecules and solid objects.
Explanation: