the first order reaction is 50% complete in 40 minutes . calculate the time required for the completion of 90% of reaction? [Given : log 2 = 0.3010, log 10 = 1]​

Answer:

The primary cell wall of land plants is composed of the polysaccharides cellulose, hemicelluloses, and pectin.

Algae possess cell walls made of glycoproteins and polysaccharides such as carrageenan, cellulose, hemicellulose and pectins and agar that are absent from land plants. In bacteria, the cell wall is composed of peptidoglycan.

Hence, Algae have cell walls made up of Cellulose, Hemicellulose, and Pectins.

So, the correct answer is 'Cellulose, Hemicellulose and Pectins'.

Answer:

Most of the chemical elements you encounter every day are combined with other elements to form compounds. Here's a gallery of pictures of the pure elements, so you can see what they look like.

The elements are listed in the order in which they appear in the periodic table; the first elements have the lowest atomic number, which increases through the table. Toward the end of the periodic table, there aren't any images of elements. Some are so rare only a few atoms have ever been produced, plus they are highly radioactive, so they often vanish an instant after creation. Yet, many elements are stable. Here's your chance to get to know them.

Answer:

Solution

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Sphere: Foot ball, Cricket ball, Laddu

Cylinder: Battery, Biscuit pack, Log, Candle

Pyramid: Pyramid ; Cuboid: Match box, Sharpner, Biscuit pack

Cone : Ice-cream, Flower pot ; Cube:Dice, Carton.

Answers:

1. Radio

2. Email

3. Pragmatic

4. Telegraph Fax

5. Prejudice

Answer:

Given:

A student obtained the marks 16,50,70,65 and 85 in subjects a, b, c, d and e.

To find:

What would be the average marks?

Solution:

To find the average marks, first, add the given numbers. Then, divide it by a total number of values.

Sum of the given observations:

16+50+70+65 + 8516+50+70+65+85

= 286=286

Now, divide it by a total number of observations:

The total number of observations = 5

= \dfrac{286}{5}=

5

286

= 57.2=57.2

Hence, the average marks = 57.2