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2 years ago

Why are there few fossils of protists. write a paragraph response

Chemistry

1 answer:

Liono4ka [1.6K]2 years ago

3 0

Answer:

protists that produce a hard outer covering have left many fossils, other protists lack hard parts, so few fossils of these organisms have been found. ... Protists in this group are called plantlike because, like plants, they contain the pigment chlorophyll in chloroplasts and can make their own food.

Explanation:

Hope it helps, some how.

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Please select the word from the list that best fits the definition

AveGali [126]

Answer:

I choose D option because may be it's correct

3 0

2 years ago

Read 2 more answers

1 C8H10(l) +21/2O2(g) → 8CO2(g) + 5H2O(g), Hcomb= ? Hf for C8H10(l) = +49.0kJ/mol C8H10(l) Use the balanced combustion reaction

nikklg [1K]

Answer:

$H_{comb}=-4406kJ/mol$

Explanation:

Hello,

In this case, the enthalpy of combustion is understood as the energy released when one mole of fuel, in this case octene, is burned in the presence of oxygen and is computed with the enthalpies of formation of the fuel, carbon dioxide and water as shown below (oxygen is circumvented as it is a pure element):

$H_{comb}=8*\Delta _fH_{CO_2}+5\Delta _fH_{H_2O}-\Delta _fH_{C_8H_{10}}$

Thus, since we already know the enthalpy of combustion of the fuel, for carbon and water we have -393.5 and -241.8 kJ/mol respectively, thereby, the enthalpy of combustion turns out:

$H_{comb}=8*(-393.5kJ/mol)+5(-241.8kJ/mol)-49.0kJ/mol\\\\H_{comb}=-4406kJ/mol$

Best regards.

4 0

3 years ago

Explain how you find the instantaneous speed or velocity of an object

puteri [66]

Answer:

divide the distance by the average

Explanation:

ash QC ok

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3 years ago

Define electron affinity

LekaFEV [45]

Electron affinity corresponds to the energy released when an electron is added to<span> a </span>neutral atom in the gas phase<span>.

hope this helps!</span>

8 0

3 years ago

Fill in the blanks....

sveta [45]

Iron 1 chlorine 3 for number what I suggest you do is look at the periodic table online and then look at the numbers and see how many are there

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3 years ago