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2 years ago

What characteristics do scientists use to distinguish between organisms in different kingdoms

1 answer:

7 0

Similarities and dissimilarities between the organisms - similar featured organisms will be kept in one group and dissimilar featured organisms in other group. Different features like no. of cells, nature of body surface, nature of body cavity nature of skeleton, nature of locomotion, nature of sexual parts, nature of circulatory system etc.

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List two detection (i.e. visualisation) techniques commonly used to visualise compounds in TLC.

olya-2409 [2.1K]

Answer:

The most common non-destructive visualization method for TLC plates is ultraviolet (UV) light. A UV lamp can be used to shine either short-waved (254nm) or long-waved (365nm) ultraviolet light on a TLC plate with the touch of a button

Explanation:

hope this helps

7 0

3 years ago

** worth 20 points plus brainliest to whoever answer it correctly **

malfutka [58]

Answer: The correct answer is Option A.

Explanation:

To calculate the number of moles of a substance, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Given mass of fluorine = 6 grams

Now, to know the moles, we divide the given mass of fluorine by the atomic mass/molar mass of fluorine.

Thus, the correct answer is Option A.

5 0

3 years ago

What is the theoretical yield of sodium chloride for the reaction of 55.0 g na with 67.2 g cl2?

lozanna [386]

The chemical reaction would be written as:

2Na + Cl2 = 2NaCl

Since we are given the amounts of the reactants available for reaction, we have to determine the limiting reactant. And use this amount to calculate for the theoretical yield.

55 g Na ( 1 mol / 22.99 g ) = 2.39 mol Na
67.2 f Cl2 ( 1 mol / 70.9 g ) = 0.95 mol Cl2

Therefore, the limiting reactant would be Cl2 since it is the one consumed completely.

0.95 Cl2 ( 1 mol NaCl / 1 mol Cl2) = 0.95 NaCl produced from the reaction

7 0

3 years ago

Population doubles in ever decreasing time periods, especially since 1850. What is responsible for this trend?

Firlakuza [10]

Answer:

The larger the population the larger the increase

Explanation:

Took the quiz as an openbook quiz and got it right

7 0

2 years ago

When a negatively charged species is most appropriately depicted as a hybrid of several resonance forms, the negative charge pre

Varvara68 [4.7K]

Answer:

True

Explanation:

Resonance is a concept that was introduced when it was not possible to represent a compound with a single Lewis structure. Lewis formulas represent localized electrons, either shared by two atoms in a covalent bond or as non-shared electrons belonging to a given atom. Certain organic compounds, especially those containing multiple bonds can be described by more than one Lewis structure. In these cases, the true Lewis structure has an electronic distribution that is a "hybrid" of all possible Lewis structures of that molecule. Each of Lewis's structures is known as resonance or canonical forms and they are related to each other by a double-headed arrow, where all possible positions of electrons in that molecule are represented.

This type of compound has multiple bonds (double or triple) where electrons are not fixed, but move quickly between atoms, "resonating" between the different Lewis structures. For this reason, when a resonance hybrid has a negative charge, this charge moves between the different resonant structures.

Many times, an intermediate Lewis structure is drawn, with dotted lines, simulating approaching the real structure of the compound, and where this phenomenon of electron and charge mobility can be observed. For example, as we can observe in the ozone resonance image.

5 0

2 years ago