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2 years ago

10

A student hypothesizes that a sample of rock formed from ocean sediments. which would best help the student support this hypothe

sis?

1 answer:

Ad libitum [116K]2 years ago

7 0

The answer is would be -- Clam shells found within the rock sample.

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Name this organism? <br><br>Is this organism prokaryotic or eukaryotic?

AlladinOne [14]

Answer:

Prokaryotes

Explanation:

Prokaryotes are organisms that consist of a single prokaryotic cell. Eukaryotic cells are found in plants, animals, fungi, and protists. They range from 10–100 μm in diameter, and their DNA is contained within a membrane-bound nucleus.

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4 0

2 years ago

How is enthalpy used to predict whether a reaction is endothermic or exothermic?

Radda [10]

<u>Answer:</u>

<em> $329.48 KJ/mol$ heat is released by the combustion of $2 mol$ of methane</em>

<u>Explanation:</u>

The value of enthalpy determines whether the reaction is exothermic or endothermic. If the enthalpy change is positive, then the reaction is endothermic (heat or energy released) and if the enthalpy change is negative then the reaction is exothermic (heat or energy absorbed).

$2CH_4(g)+4O_2(g) => 2CO_2(g)+4H_2O(g)$

$\Delta H \ reaction=[ 2(\Delta HfCO_2)+ 4(\Delta HfH_2O)]-[2(\Delta HfCH_4)+4(\Delta HfO_2)]$

= $2 ( -(393.5 KJ)/mol)-[2( -74.6 KJ/mol)+4(-241.82 KJ/mol)]$

$= -787 KJ/mol-[ -149.2 KJ/mol-967.28 KJ/mol]$

$= -787 KJ/mol+1116.48 KJ/mol$

$=329.48 KJ/mol$

<em>In this question, </em><em>the enthalpy of formation</em><em> has positive value and hence the </em><em>reaction is endothermic</em><em> in which the heat is released. </em>

3 0

2 years ago

Residents of three villages with three different sources of water supply were asked to participate in a survey to identify chole

lubasha [3.4K]

Answer:

<em>a. Cross-sectional study</em>

Explanation:

A cross-sectional analysis <em>includes at one particular point in time looking at data from a population.</em> Participants are chosen based on specific variables of interest in this type of study.

For developmental psychology, cross-sectional experiments are often used, but this approach is also used in many other fields, including social science and education.

3 0

2 years ago

Earth's outer core is made of_____.

inn [45]

Answer:

Liquid metal.

Tell me if wrong. :) Hope it helps!

Explanation:

7 0

2 years ago

Read 2 more answers

15. Which of the following is a valid explanation for why people produce

lesya [120]

Im almost certain the answer is D but theres a chance I might be wrong

8 0

2 years ago