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3 years ago

Where are cell walls only found in

Chemistry

2 answers:

KonstantinChe [14]3 years ago

7 0

Answer:

A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection. They are found in bacteria, archaea, fungi, plants, and algae. Animals and most other protists have cell membranes without surrounding cell walls.

Explanation:

Monica [59]3 years ago

6 0

Answer:

plant cell is ur answer for this question

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Consider 100.0 g samples of two different compounds consisting only of vanadium and oxygen. one compound contains 61.4 g of vana

xxMikexx [17]

Answer:

2:1

Explanation:

The Law of Multiple Proportions states that when two elements A and B combine to form two or more compounds, the masses of B that combine with a given mass of A are in the ratios of small whole numbers.

That is, if one compound has a ratio r₁ and the other has a ratio r₂, the ratio of the ratios r is in small whole numbers.

1. Compound 1

Mass of O = 100.0 - 61.4 = 38.6 g

$r_{1} = \dfrac{\text{mass of O}}{\text{mass of V}} = \dfrac{ 38.6}{61.4} = 0.6287$

2. Compound 2

Mass of O = 100.0 - 76.1 = 23.9 g

$r_{2} = \dfrac{ 23.9}{76.1} = 0.3141$

3. Ratio of the ratios

$r = \dfrac{r_{1}}{r_{2}} = \dfrac{ 0.6287}{0.3141} = \dfrac{2.00}{1} \approx 2\\\\\text{The relative amounts of O per gram of V are in the ratio }\boxed{\mathbf{\dfrac{2}{1}}}$

For example. the compounds might be VO₂ and VO.

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3 years ago

Why does a higher temperature cause a reaction to go faster?

erastovalidia [21]

Because it causes more collisions of molecules per second and collisions have higher energy because of higher temperature.

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Which of the following is a pure substance? Air Blood Copper Wood

krek1111 [17]

Answer:

copper

Explanation:

its an element, its not mixed with anything else

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What does the arrangement of the periodic table help scientists see?

alexandr1967 [171]

option A is a precise one to be selected!

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why is cobalt placed before nickel on the periodic table of elements even though it has a higher average atomic mass than nickel

Rus_ich [418]

Because it has a smaller atomic number. Elements are not lined up according to the higher average atomic mass, but rather according to the higher atomic number.

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