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2 years ago

4. Which of the following sensory receptors would lead you to squint in bright light?

Biology

1 answer:

notka56 [123]2 years ago

3 0

Answer:

3 - Photoreceptors.

Explanation:

Photoreceptors are a sensor that is connected to your retina. They sense light and send the message to your brain. The sensors automatically squint your eyes if something will blind you.

The correct answer is 'photoreceptors'.

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If a child has two genes for blonde hair (one from each parent), his genotype is said to be

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3 years ago

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What is the role of the alcohol in this experiment?

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2 years ago

D. the ____________ focuses light rays before they enter the posterior portion of the eye.

kotegsom [21]

The iris focuses light rays before they enter the posterior portion of the eye

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2 years ago

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

Radda [10]

Answer:

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

Explanation:

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).

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

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

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

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

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

$=329.48 KJ/mol$

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

3 0

2 years ago

A. True

Gennadij [26K]

False. Rosalind Franklin, Maurice Wilkins, James Watson, and Francis Crick found out the actual structure of the DNA molecule by x-rays and research.

Hope this helps.

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3 years ago