Why is a cell membrane like a security guard because....... Why?????

1 answer:

5 0

The cell membrane allows certain items into a cell and blocks others from entering, just like a security guard protects a real factory.

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How many neutrons does the most common isotope of hydrogen have?

Alexandra [31]

1 becuse its all it can hold

8 0

3 years ago

Which are produced when HCl reacts with Ca(OH)2?

Ganezh [65]

CaCl2 + H2O are produced when HCl react with Ca(OH)2

Explanation
equation for reaction is as follows

Ca(OH)2 + 2HCl → CaCl2 +2H2O

1 mole of calcium hydroxide (Ca(OH)2 reacted with 2 moles of hydrochroric acid (HCl) to form 1 moles of calcium chloride CaCl2 and water H2O. This type of reaction is known as neutralization reaction since it between an acid (HCl) and a base (Ca(OH)2

3 0

4 years ago

Read 2 more answers

Consider stoichiometric combustion of gasoline and air. Assume a full tank of gasoline holds 50 L (approximately 13.2 gallons),

Inessa05 [86]

Answer:

520 kg

Explanation:

Let's consider the combustion of isooctane.

C₈H₁₈(l) + 12.5 O₂(g) → 8 CO₂(g) + 9 H₂O(l)

We can establish the following relations:

1 mL of C₈H₁₈ has a mass of 0.690 g (ρ = 0.690 g/mL).
The molar mass of C₈H₁₈ is 114.22 g/mol.
The molar ratio of C₈H₁₈ to O₂ is 1:12.5.
The mole fraction of O₂ in air is 0.21.
The molar mass of air is 28.96 g/mol.

50 L of isooctane require the following mass of air.

$50 \times 10^{3}mLC_{8}H_{18}.\frac{0.690gC_{8}H_{18}}{1mLC_{8}H_{18}} .\frac{1molC_{8}H_{18}}{114.22gC_{8}H_{18}} .\frac{12.5molO_{2}}{1molC_{8}H_{18}} .\frac{1molAir}{0.21molO_{2}} .\frac{28.96 \times 10^{-3}kgAir}{1molAir} =520kgAir$