Answer:
cold air rising and warm air sinking
Explanation:
Convection is well known in nature. During convection, warm particles rise above the surface while cooler particles sink below. Hence a convection current is set up.
Air moves by convection. Hot air rises and moves toward and is then replaced with cooler air. A typical application of convection in nature is land and sea breeze.
An Arrhenius base produces hydroxide ions (–OH) when dissolved in water. A Brønsted-Lowry base can accept a proton (H+) from another substance. A Lewis base donates a pair of electrons to form a coordinate covalent bond.
An Arrhenius base is a substance that produces hydroxide ions (–OH) when dissolved in water. An example of an Arrhenius base is sodium hydroxide (NaOH), which dissociates in water to form Na+ and OH– ions.
A Brønsted-Lowry base is a substance that can accept a proton (H+) from another substance. Ammonia (NH3) is an example of a Brønsted-Lowry base as it can accept a proton to form its conjugate acid, ammonium (NH4+).
A Lewis base is a substance that donates a pair of electrons to form a coordinate covalent bond. An example of a Lewis base is ammonia (NH3), which donates a pair of electrons to a Lewis acid to form a Lewis acid-base complex.
It is possible for a base to be of more than one type. For example, ammonia (NH3) is both a Brønsted-Lowry base and a Lewis base.
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An Arrhenius base is a substance that increases the concentration of OH- in water. A Brønsted-Lowry base is a substance that can accept a hydrogen ion. A Lewis base can donate an electron pair. It is possible for a base to be classified as more than one type.
An Arrhenius base is defined as a substance that increases the concentration of hydroxide ions (OH-) when dissolved in water. Sodium hydroxide (NaOH) is an example of an Arrhenius base as it dissociates in water to form a sodium ion (Na+) and a hydroxide ion (OH-).
A Brønsted-Lowry base, on the other hand, is any substance that can accept a proton (a hydrogen ion). Ammonia (NH3) is a common example of a Brønsted-Lowry base. When it reacts with water, it accepts a proton from a water molecule, forming its conjugate acid, ammonium (NH4+).
Last but not least, a Lewis base is a substance that can donate an electron pair. For example, ammonia (NH3) can act as a Lewis base as it donates its lone pair of electrons to form a coordinate covalent bond.
Yes, it is possible for a base to be categorized as both an Arrhenius, Brønsted-Lowry, and Lewis base - water (H2O) is one such example.
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b. cell membrane or
c. ribosome
Answer:
A.) Chloroplast
Explanation:
Chloroplasts are found in plant cells but not in animal cells. The chloroplast is the organelle that captures light energy and is the site where photosynthesis occurs.
Answer and explanation;
-Phosphorous can be prepared from calcium phosphate by the following reaction: 2Ca3(PO4)2 + 6SiO2 + 10C -----> 6CaSi03 + P4 + 10CO
Phosphorite is a mineral that contains Ca3(PO4)2 plus other non phosphorous containing compounds.
-If the phosphorite sample is 75% Ca3(PO4)2 by mass, then;
mass of Ca3(PO4)2 is given by; 0.75 * (1000 g) = 750g
MM Ca3(PO4)2 = 310.19 g/mol
thus, Number of moles of Ca3(PO4)2;
= 750g / 310.19 g/mol
= 2.42 moles of Ca3(PO4)2 From the equation;
(2 mol Ca3(PO4)2 = 1 mol P4) Thus; moles of P4 will be;
=2.42 mol Ca3(PO4)2 * (1 mol P4 / 2 mol Ca3(PO4)2)
= 1.21 moles of P4 Mass of P4 will be;
=1.21 mol P4 * ( 4 x 30.974) g/mol
= 1.21 mol P4 * 123.896 g/mol
= 150 g P4. (2 sf)
Hence;
1.5 x10^(2) g P4 are produced from 1.0 kg Phosphorite mineral containing 75% Ca3(PO4)2.
FALSE