Plants are able to produce special chemicals at the right time and place.

Please help me I don’t know this

Zina [86]

Answer:

aplha particle is the answer

5 0

2 years ago

Which organelle in the table is correctly matched with its function?<br> which one is it??

Papessa [141]

Answer:

$\huge\boxed{\sf Ribosomes}$

Explanation:

<h3>Organelles and their function:</h3><h3><u>Lysosomes:</u></h3>

Lysosomes functions in the digestion of food of the cell.
It contains hydrolytic enzymes.

<h3><u>Vacuole:</u></h3>

Vacuole mostly functions in storage.

<h3><u>Mitochondrion:</u></h3>

Mitochondrion is the power house of the cell.

<h3><u>Ribosome:</u></h3>

Ribosome functions in protein synthesis.

$\rule[225]{225}{2}$

4 0

1 year ago

(a)-Use Lewis symbol store present there action that occurs between Ca and F atoms. (b)-What is the chemical formula of the most

Charra [1.4K]

Answer:

(a) The Lewis structure is shown in the image below.

(b) $CaF_2$

(c) Calcium loses 2 electrons to 2 atoms of fluorine and these 2 atoms of fluorine accepts each electron to form ionic bond.

(d) Calcium atom loses electrons.

Explanation:

Calcium is the element of second group and forth period. The electronic configuration of Calcium is - 2, 8, 8, 2 or $1s^22s^22p^63s^23p^64s^2$

There are 2 valence electrons of Calcium.

Fluorine is the element of group 17 and second period. The electronic configuration of the element fluorine is - 2, 7 or $1s^22s^22p^5$

There is 1 valence electron of fluorine.

The Lewis structure is drawn in such a way that the octet of each atom is complete.

Thus, calcium loses 2 electrons to 2 atoms of fluorine and these 2 atoms of fluorine accepts each electron to form ionic bond. This is done in order that the octet of the atoms are complete and they become stable.

Thus, the formula of calcium chloride is $CaF_2$ .

<u>(a) The Lewis structure is shown in the image below.</u>

<u>(c) Calcium loses 2 electrons to 2 atoms of fluorine and these 2 atoms of fluorine accepts each electron to form ionic bond.</u>

<u>(d) Calcium atom loses electrons.</u>

5 0

2 years ago

Fe2O3 + CO → Fe + CO2 If 2 moles of Fe2O3 react with 9 moles of CO, how many moles of each product are formed?

Y_Kistochka [10]

Answer: B. 4 moles Fe and 3 moles CO2

Explanation:

write a balanced chemical reaction

that is FeO3 + 3 CO → 2 Fe + 3CO2

2 moles of Fe2O3 reacted with 3 x2=6 moles of Co to form Fe and CO2 therefore CO was in excess and Fe2O3 was limiting reagent.

use the mole ratio to determine the moles of each product.

that is the mole ratio 0f Fe2O3 : Fe is 1:2 therefore the moles of Fe = 2x2=4 moles

the mole ratio of Fe2CO3 : CO2 is 1: 3 therefore the moles of Co2 = 2 x3 = 6 moles

8 0

2 years ago

Read 2 more answers

How does a scientific theory differ from a scientific law?

Bas_tet [7]

1.A law is an observation; a theory is the explanation of that observation.

2.A theory requires experimentation under various conditions. A law has no such requirements.
3.A theory may become obsolete with time. This is not the case with a law.
4.A theory can be replaced by another better theory; however, this never happens with a law.
5.A theory may be strong or weak according to the amount of evidence available. A law is a universally observable fact.

Hope this helps:)

7 0

3 years ago