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3 years ago

Why are digestive enzymes in a cell enclosed in a membrane

1 answer:

7 0

The membrane keeps the digestive materials from leaking out into the cytoplasm and destroying the cell.

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The area of a telescope lens is 7903 rnrn2 {a) What is the area in square feet (ft2)? (b) If it takes a technician 45 s to polis

LekaFEV [45]

Answer:

Area is 0.08504 $ft^{2}$ and $2.6\times 10^{3}s$ are needed for polishing

Explanation:

(a) ft is unit of F.P.S system whether mm is unit of M.K.S system.

According to unit conversion, $1mm=0.00328ft$

So, $1mm^{2}=(0.00328)^{2}ft^{2}=1.076\times 10^{-5}ft^{2}$

hence, $7903mm^{2}=7903\times 1.076\times 10^{-5}ft^{2}=0.08504ft^{2}$

So, area of telescope lens is 0.08504 $ft^{2}$

(b) $135mm^{2}$ are polished in 45s

So, $7903mm^{2}$ are polished in $\frac{45\times 7903}{135}s$ or $2.6\times 10^{3}s$

5 0

3 years ago

How many grams of \text{NaCl}NaClstart text, N, a, C, l, end text will be produced from 18.0 \text{ g}18.0 g18, point, 0, start

Nezavi [6.7K]

Answer:

18.7887 g of NaCl

Explanation:

The question reads - How many grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2?

Let us start by writing out the balanced equation of the reaction:

Na + Cl2 ---> NaCl2

1 mole, each of Na and Cl2 is required to produce 1 mole of NaCl.

mole = mass/molar mass

Therefore

18 g of Na = 18/23 = 0.7826 mole

23 g of Cl2 = 23/71 = 0.3239 mole

In this case, the Na is in excess and the Cl2 becomes the limiting reagent. Hence

0.3239 mole of Cl2 will react with 0.3239 mole of Na to yield 0.3239 mole of NaCl.

mass of 0.3239 mole NaCl = 0.3239 x 58 = 18.7887 g

Hence, 18.7887 grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2.

3 0

3 years ago

Come up with a definition for density

Fantom [35]

Density measures how tightly packed particles are.

If particles are tightly packed together, they will be more dense.

If they are loosely together, they will be less dense.

However, a common mistake is thinking that if something

is more dense it means that it's heavier.

However, that's not the case.

It has to do with how particles are packed in an object.

5 0

3 years ago

Read 2 more answers

Nicotine is an addictive substance found in tobacco. Identify the hybridization state and geometry of each of the nitrogen atoms

Marina CMI [18]

The structure of nicotine is as follows:

In the aromatic ring, nitrogen atom has two bonds and one lone pair therefore, hybridization will be $sp^{2}$ . In five-membered ring , nitrogen has two bonds and 1 lone pair therefore, hybridization will be $sp^{3}$ .

Therefore, hybridization state of $N^{1}$ and $N^{2}$ (as in the attached structure) is $sp^{2}$ and $sp^{3}$ respectively.

Now, according to VESPR theory for $sp^{2}$ hybridization with one lone pair the geometry is bent and for $sp^{3}$ hybridization with one lone pair the geometry is pyramidal.

Therefore, geometry of $N^{1}$ and $N^{2}$ (as in the attached structure) is bent and pyramidal respectively.

3 0

3 years ago

When 2 or more elements bond together in definite proportions they form a?

Elena L [17]

The answer is compound.

6 0

3 years ago