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Nataliya [291]
2 years ago
15

How are insects different from arachnids?

Chemistry
1 answer:
aalyn [17]2 years ago
8 0

Arachnids lack antennae. The main differences between insects and arachnids are in their body structure and legs.

<h3>What are insects?</h3>

Both insects and arachnids are multi-legged creatures that tend to elicit fear, and while they have a lot in common, including that fear response, there are some distinct differences between the two.

The main differences between insects and arachnids are in their body structure and legs.

Arachnids have eight legs, whereas insects only have six. Arachnids have simple eyes, whereas insects have compound eyes. Arachnids lack antennae while insects do.

Therefore, Arachnids lack antennae. The main differences between insects and arachnids are in their body structure and legs.

To learn more about insects, refer to the link:

brainly.com/question/28174759

#SPJ1

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3 years ago
2. What type of compound is water (H20) and why is it called a universal solvent?
Oduvanchick [21]

Answer:

Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid.

Explanation:

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3 years ago
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Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a
agasfer [191]

Answer: 243 hours

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = age of sample

a = initial amount of the reactant = 5.000\mu g

a - x = amount left after decay process =  \frac{10}{100}\times 5.000\mu g=0.5\mu g

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{73.00hours}=9.49\times 10^{-3}hours^{-1}

b) for reducing the mass to 10.00 % of its original mass

t=\frac{2.303}{k}\log\frac{a}{a-x}

t=\frac{2.303}{9.49\times 10^{-3}}\log\frac{5.000}{0.5}

t=243hours

The time taken to reach 10.00 % of its original mass is 243 hours

3 0
3 years ago
Justify the statement, "nuclear energy is harmful as well as useful."​
Olenka [21]

Nuclear energy is harmful because it releases of harmful ionizing radiation and has been employed in the production of atomic bombs and hydrogen bombs.

Nuclear energy is beneficial in that it produces vast amount of energy for domestic and industrial purposes.

<h3>What is nuclear energy?</h3>

Nuclear energy refers to the energy which is produced as a result of the changes that occur in the nucleus of atoms of elements.

Nuclear energy produces the largest amount of energy when compared to other forms of energy sources.

Nuclear energy is produced by two types of nuclear reactions:

  • Nuclear fission and Nuclear fusion

Nuclear energy is harmful in that it results in the release of harmful ionizing radiation which damages cells and tissues of living organisms.

Nuclear energy is also harmful because nuclear energy has been employed in the production of atomic bombs and hydrogen bombs.

On the other hand, nuclear energy is beneficial in that it produces vast amount of energy which can be used for domestic and industrial purposes. It also produces fewer wastes that damage the environment compared to fossil fuels.

In conclusion, nuclear energy is both beneficial and harmful.

Learn more about nuclear energy at: brainly.com/question/15214614

#SPJ1

8 0
2 years ago
A hot sun warms the surface of a lake on a calm day. What will happen to the cold water at the bottom of the lake?
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It will go to the top of the lake
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