All categories

2 years ago

A houseplant is placed on a window sill that gets direct, bright sunlight

Chemistry

1 answer:

Molodets [167]2 years ago

7 0

Answer:

D. Phototropism

Explanation:

Plants, like every other living organism, responds to external stimulus. In this question, the stimulus is LIGHT from the sun entering through the window sill. The plant is responding positively to the light stimuli by growing towards the direction where the light is coming from. This exhibit is called PHOTOTROPISM.

Phototropism, comes from two words viz photo- meaning light and tropism- meaning movement. Hence, phototropism is the growth of an organism (plant in this case) in response to a light stimulus. The case described in this question is POSITIVE PHOTOTROPISM because the growth occurs towards the light source.

You might be interested in

Calculate the standard enthalpy change for the reaction at 25 ∘C. Standard enthalpy of formation values can be found in this lis

weqwewe [10]

Answer:

$\Delta H_{rxn}=-2043.999kJ$

Explanation:

$\Delta H_{rxn}^{0}=\sum [n_{i}\times \Delta H_{f}^{0}(product)_{i}]-\sum [n_{j}\times \Delta H_{f}^{0}(reactant_{j})]$

Where $n_{i}$ and $n_{j}$ are number of moles of product and reactant respectively (equal to their stoichiometric coefficient).

$\Delta H_{f}^{0}$ is standard heat of formation and $\Delta H_{rxn}^{0}$ is standard enthalpy change for reaction at $25^{0}\textrm{C}$

So, $\Delta H_{rxn}=[3mol\times \Delta H_{f}^{0}(CO_{2})_{g}]+[4mol\times \Delta H_{f}^{0}(H_{2}O)_{g}]-[1mol\times \Delta H_{f}^{0}(C_{3}H_{8})_{g}]-[5mol\times \Delta H_{f}^{0}(O_{2})_{g}]$

or, $\Delta H_{rxn}=[3mol\times -393.509kJ/mol]+[4mol\times -241.818kJ/mol]-[1mol\times -103.8kJ/mol]-[5mol\times 0kJ/mol]$

or, $\Delta H_{rxn}=-2043.999kJ$

4 0

3 years ago

Help me pleaseee

telo118 [61]

Answer: 11.25 moles of $O_2$ will be required to completely react with 2.25 moles of $C_3H_8$ .

Explanation:

The balanced chemical equation is:

$C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)$

According to stoichiometry :

1 mole of $C_3H_8$ require = 5 moles of $O_2$

Thus 2.25 moles of $C_3H_8$ will require= $\frac{5}{1}\times 2.25=11.25moles$ of $O_2$

Thus 11.25 moles of $O_2$ will be required to completely react with 2.25 moles of $C_3H_8$ .

3 0

2 years ago

Why do we fill balloons with helium gas instead of oxygen gas

miss Akunina [59]

Answer: cause oxegeon is harmful then helium

Explanation:

3 0

3 years ago

A nurse swabs your skin with rubbing alcohol, and you feel a cold spot created at that spot. what explains this cooling effect?

faust18 [17]

The cooling effect meaning that your skin releases alcohol molecules with the appropriate heat for it to evaporate. The alcohol is cold on your skin for the reason that when it comes in contact, the temperature of the body makes it change from fluid to gas, which pulls warm from the encompassing condition, including the skin. The aftereffect of this response is a chilly feeling.

4 0

2 years ago

What are correct statements about all greenhouse gases? check all that apply.

adell [148]

The correct statements about all greenhouse gases include the following:

They interact with wavelengths shorter than IR to produce IR.
Their absorption spectra will show absorbance in the 400-700 nm region.

<h3>What is greenhouse gas?</h3>

These are gases which are found in the atmosphere and have varying effects on the energy present on earth.

Examples include carbon dioxide, methane etc and their characteristics are mentioned above.

Read more about Greenhouse gas here brainly.com/question/12684997

#SPJ1

8 0

1 year ago