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Marysya12 [62]
3 years ago
8

Jack an investigator wants to prove that a certain suspect was present at the crime scene when the crime was committed. What kin

d of evidence should he look for
Chemistry
1 answer:
grin007 [14]3 years ago
5 0

Answer:

eye witnesses, dna, fingerprints, hair, time stamped photos/ videos

Explanation:

:)

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What the I haven't even learned this yet

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Consider the reaction of magnesium metal with hydrochloric acid to produce magnesium chloride and hydrogen gas. If 3.29 mol of m
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Answer:

1.645 moles of excess reactant that is of magnesium metal are left over.

Explanation:

Moles of magnesium metal = 3.29 mol

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Mg(s)+2HCl(aq)\rightarrow MgCl_2(aq)+H_2(g)

According to recation, 2 moles of HCl reacts with 1 mol of magnesium metal, then 3.29 moles of HCl will react with :

\frac{1}{2}\times 3.29 mol=1.645 mol of magnesium metal

Moles of HCl left = 3.29mol - 3.29 mol = 0

Moles of magnesium metal left = 3.29 mol - 1.645 mol = 1.645 mol

1.645 moles of excess reactant that is of magnesium metal are left over.

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3 years ago
Technetium-104 has a half life of 18.0 minutes. how much of a 165.0 g sample remains after 90.0 minutes?
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The mass of 165.0 g sample that remains after 90.0 minutes is 5.16 grams

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The diagrams show gases that are stored in two separate but similar containers.
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Answer: The diagrams show gases that are stored in two separate but similar containers. If both gases are at the same temperature, which one has the greater pressure? Gas 2 because it has more particles that are colliding.

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C

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