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evablogger [386]
3 years ago
15

Which can be excluded due to the absence of fossil records

Chemistry
1 answer:
xeze [42]3 years ago
8 0

Answer:

a. body of jellyfish

Explanation:

it is because they are made up of 95 percent of water and cannot be stored in rocks as fossil ...plz add my answer as brainliest

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The enzyme urease catalyzes this reaction. If urease is added to a solution that contains ammonia and other nitrogen-containing
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The enzyme urease catalyze the hydrolysis of urea into ammonia and carbon dioxide. If urease is added to any compound which has no urea, it will not catalyze any reaction because if there is no urea, urease will not bind to any substance.
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Calculate the volume of a cube with links to 2.2 in.
vlada-n [284]

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10.65

Explanation:

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3 years ago
You are given two fatlike solid substances and determine that sample a has a higher melting point than sample
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Given that <span>sample a has a higher melting point than sample
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ure to answer all parts. The vapor pressure of ethanol (C2H5OH) at 20°C is 44 mmHg, and the vapor pressure of methanol (CH3OH) a
eimsori [14]

Answer:

P_{met}=40.98mmHg\\\\P_{et}=24.82mmHg

Explanation:

Hello

In this case, by considering the Raoult's law we can write:

P_{met}=x_{met}P_{sat,met}\\\\P_{et}=x_{et}P_{sat,et}

Whereas the purpose is to compute the pressures of both methanol and ethanol (pressures above the solution), thus, the first step is to compute the molar fractions:

n_{met}=25.3gCH_3OH*\frac{1molCH_3OH}{32gCH_3OH}=0.791molCH_3OH\\ \\n_{et}=47.1gCH_3CH_2OH*\frac{1molCH_3CH_2OH}{46gCH_3CH_2OH}=1.02molCH_3CH_2OH\\\\x_{met}=\frac{0.791mol}{0.791mol+1.02mol}=0.436\\ \\x_{et}=1-x_{met}=1-0.436=0.564

Therefore, the pressures turns out:

P_{met}=0.436*94mmHg=40.98mmHg\\\\P_{et}=0.564*44mmHg=24.82mmHg

Best regards.

8 0
3 years ago
What role does the oxidizing agent play in a redox reaction?
mr Goodwill [35]

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There are two types of reactants in redox reactions. One is oxidizing agent and other is reducing agent.

Oxidizing agent is a substance which helps to oxidize other substance by gaining electrons. This is also called as oxidizer. Due to the gaining electrons, oxidizing agents tend to be reduced.

Reducing agent or reducer helps to reduce other substance while loosening electrons. Hence, reducing agents tend to be oxidized.</span>

5 0
4 years ago
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