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Nat2105 [25]
2 years ago
7

The picture below shows a flower experiencing phototropism, a type of growth movement.

Chemistry
2 answers:
Ratling [72]2 years ago
6 0
I think it’s a.
the plant, Simulated by light through the window
lakkis [162]2 years ago
4 0
The correct answer is A
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Help please thanks you
scoundrel [369]

Explanation:

Ok so water is H2O and cabon dioxide in the air is CO2, so the water goes through the carbon dioxide and makes acid rain H2SO4.

Now we have our limestone which is CaCO3.

What happens is that the acid breaks apart our limestone into Ca2+ and CO3 2-. This then reforms into Calcium bicarbonate Ca(CO3)2.

Calcium bicarbonate is soluble in water and is hence washed away by the rain eroding the limestone.

5 0
3 years ago
Which pair of kingdoms include organisms which are all multicellular?
blondinia [14]
The animal kingdom includes <span>multicellular organisms. Also the cells of the species in this kingdom have a nucleus but no chloroplasts or cell wall. </span>
It is the largest of all of the six kingdoms and includes mammals, birds, reptiles, insects and more.
Other kingdom from which all organisms are multicellular is t<span>he plant kingdom. It includes all types of plants including mosses, flowering plants, and ferns. </span>
7 0
3 years ago
What type of bond is H2Se
Vinvika [58]

Answer:The lone pair of electrons takes up more space than a regular bonding pair since it it is not confined to be between two atoms, so it adds coulombic repulsion to the bonding pairs and compresses the angle. Therefore, the bond angle is less than the standard 109.5∘ . It is actually 97.7∘

6 0
3 years ago
Which statement best describes the way a catalyst works?
bogdanovich [222]

Answer: E. It decreases the value of Eact.

Explanation:

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and more molecules convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

6 0
3 years ago
My question today is : The reaction of 11.9g go CHCl3 with excess chlorine produced 10.2g of CCl4, carbon tetrachloride. What is
Helga [31]

Answer:

66.7%

Explanation:

Step 1: Write the balanced equation

CHCl₃ + Cl₂ ⇒ CCl₄ + HCl

Step 2: Calculate the theoretical yield of CCl₄ from 11.9 g of CHCl₃

According to the balanced equation, the mass ratio of CHCl₃ to CCl₄ is 119.38:153.82.

11.9 g CHCl₃ × 153.82 g CCl₄/119.38 g CHCl₃ = 15.3 g CCl₄

Step 3: Calculate the percent yield of CCl₄

Given the experimental yield of CCl₄ is 10.2 g, we can calculate the percent yield using the following expression.

%yield = (exp yield/theo yield) × 100%

%yield = (10.2 g/15.3 g) × 100% = 66.7%

5 0
3 years ago
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