Answer:
Redox reactions are involved in the extraction of metals from their ores, eg extracting iron by reduction within the blast furnace. Transition metals have high melting points and densities, form coloured compounds and act as catalysts
Answer:
The most reactive group of elements are found in group 1 which are alkali metals.
Explanation:
The reason why they are so reactive is because they only electron in the outer shell so this causes the to lose that one electron in ionic bonding with other elements.
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First off there are some issues in your questions but I can still help in answering this type of problem. First, there is no Sr-20. The 4 abundant form includes Sr-84, Sr-88, Sr-87, Sr-86, Sr-84.
More importantly, the half life of strontium must be given.
For demonstration sake, let us assume Sr-85 is the isotope. It has a half-life of 64.853 days and I'm assuming the units of 87.3 is in days.
A/Ao = e^-(ln2/t)T
where A- final amount Ao -initial amount t- halflife T-total time elapsed
% = <span>e^-(ln2/64.853)(87.3) = 0.3933 or 39.33%
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The match up of the left to the right column is;
1. Asteroid - A) varies greatly in size from one to the next
2. Gas Giant - B)atmosphere is primarily made of hydrogen and helium
3. Comet- C) has a characteristic glow
4. Meteoroid - D) usually burns up if it enters the earth's atmosphere
<h3>What is asteroid and meteoroid?</h3>
An asteroid is known to be a kind of a small rocky object that is said to often orbits the Sun.
Note that an meteor is known or regarded as what occurs if ]a small piece of an asteroid or comet, known to be a meteoroid, burns up when they enter Earth's atmosphere.
Learn more about Meteoroid from
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