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mina [271]
3 years ago
7

Where was silk first discovered find out the answer​

Chemistry
1 answer:
steposvetlana [31]3 years ago
3 0

Answer:

China

Explanation:

The production of silk originates in China in the Neolithic (Yangshao culture, 4th millennium BC). Silk remained confined to China until the Silk Road opened at some point during the later half of the 1st millennium BC.

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For each row in the table below, decide whether the pair of elements will form a molecular or ionic compound. If they will, then
Olin [163]

Answer:

\begin{array}{cccll}\textbf{Element 1} & \textbf{ Element 2} &\textbf{Compound?} &\textbf{Formula} &\textbf{Type}\\\text{Ar}&\text{Xe} &\text{No} &\text{None}&\text{Neither}\\\text{F}& \text{Cs} &\text{Yes} &\text{CsF} &\text{Ionic}\\\text{N} &\text{Br} &\text{Yes} & \text{NBr}_{3}&\text{molecular} \\\end{array}

Explanation:

You look at the type of atom and their electronegativity difference.

If ΔEN <1.6, covalent; if ΔEN >1.6, ionic

Ar/Xe: Noble gases; no reaction

F/Cs: Non-metal + metal; ΔEN = |3.98 – 0.79| = 3.19; Ionic

N/Br: Two nonmetals; ΔEN = |3.04 - 2.98| = 0.

4 0
3 years ago
Is ivy a monocot or dicot
Aleksandr-060686 [28]

Answer:

dicot

Explanation:

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7 0
3 years ago
The moon's craters are remnants of meteorite collisions. suppose a fairly large asteroid that has a mass of 5.00×10^12 kg (about
Paul [167]

<u>Given:</u>

Mass of asteroid, M1 = 5.00*10¹² kg

Velocity of asteroid V1 = 15.0 km/s

Mass of moon, M2 = 7.36*10²² kg

<u>To determine:</u>

The recoil velocity of moon, V2

<u>Explanation:</u>

Since the collision is perfectly inelastic, momentum is conserved. therefore,

M1 * V1 = M2* V2

V2 = M1*V1/M2 =  5.00*10¹² *15.0 /7.36*10²²  = 1.02*10⁻⁹ km/s


5 0
3 years ago
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How would you describe the sequence of reactions in a hydrogen bomb
VLD [36.1K]

A hydrogen bomb is a  nuclear bomb, like an atomic bomb, where the explosive energy comes from as nuclear reaction.  

A hydrogen bomb is about fusion — fusing atomic nuclei together to combine into bigger ones.

A hydrogen bomb, or a thermonuclear bomb, contains a fission weapon within it but there is a two-stage reaction process.

The U.S. used two atomic bombs in World War II against Japan, Then, in 1952 and 1954

In particular, monitors will be looking for isotopes of a gas called xenon, which is typically present in H-bomb reactions.

5 0
3 years ago
I JUST NEED A REAL ANSWER PLEASE.
ElenaW [278]

Explanation:

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