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babymother [125]
4 years ago
6

A chemical formula written above or below the yield sign indicates:

Chemistry
2 answers:
Sloan [31]4 years ago
4 0

b. that the substance is used as a catalyst. i took the test

jeyben [28]4 years ago
3 0

a. that a gas is formed.
b. that the substance is used as a catalyst.
c. that heat must be supplied.
<span>d. a reversible reaction.</span>

<span>A chemical formula written above or below the yield sign indicates that the substance is used as a catalyst. The answer is letter B.</span>

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These diagrams show two atoms of fluorine and an atom of magnesium.
Diano4ka-milaya [45]

The magnesium atom looses two electrons which are accepted by each of the fluorine atoms. (Option D).

<h3>What is an ionic bond?</h3>

An ionic bond is formed when two ions are formed by the loss or gain electrons. In this case, magnesium has to loose two electrons while fluorine will gain two electrons.

Thus, the correct steps in the formation of an ionic bond between these atoms are A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion (Option D).

Learn more about ionic bond:brainly.com/question/11527546

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6 0
2 years ago
To what volume (in milliliters) should you dilute 100.0 mL of a 5.50 M solution of CaCl2 solution to obtain a 0.950 M solution o
Alexxx [7]

Dilution law is given as:

M_{1}V_{1}=M_{2}V_{2}    (1)

where, M_{1} = molarity of initial concentrated solution.

V_{1} = volume of initial concentrated solution.

M_{2} = molarity of final diluted solution.

tex]V_{2}[/tex] = volume of final diluted solution.

Volume of initial concentrated solution of CaCl_{2}= 100.0 mL

Molarity of initial concentrated solution of CaCl_{2}= 5.50 M

Volume of final diluted solution of CaCl_{2} = 0.950 M

Put the values in formula (1),

5.50 M\times 100.0 mL=0.950 M\times V_{2}

V_{2} =\frac{5.50 M\times 100.0 mL}{0.950 M}

V_{2} =578.9 mL

Hence, final diluted volume of the solution is  578.9 mL.





3 0
4 years ago
Biological membranes are present in all cells, and they make up the endomembrane system of eukaryotic cells. Among other functio
docker41 [41]

Answer:

The correct option for question 1 would be:

a bilayer containing lipids with hydrophilic head groups pointing inward and hydrophobic tail groups facing the solvent (extracellular fluid and cytosol).

The correct option for question number two would be: proteins.

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The membranes present phospholipids that act as selective barriers between the intracellular and extracellular space, allowing an internal balance in relation to the external one.

Its conformation is mostly phospholipids, fatty acids, proteins (from transmembrane to intermembrane or external)

5 0
3 years ago
Which of the following chemical formulas shows a covalent compound? A.CO2 B.MgO C. NaCl D.HBr
gogolik [260]
A...because both of them(carbon and oxygen)are nonmetal
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4 years ago
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How does a fire blanket work?​
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Fire blankets are powerful pieces of equipment which work by cutting off the oxygen supply of a fire, thereby starving it of one of the three crucial elements it needs to survive and ultimately extinguishing it.

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