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3 years ago

True or false: Some parasites have complex life cycles where they live in different species of hosts at different stages

Chemistry

2 answers:

Fiesta28 [93]3 years ago

7 0

Answer:

True there are a few.

Explanation:

GrogVix [38]3 years ago

6 0

Answer:

true

Explanation:

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What would the mass of 7 red apples be in kilograms?

Bogdan [553]

Answer:

I think it would be at 0.7 kg mass of the sun

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3 years ago

Which of the following is not among the advantages of generating nuclear energy?

WARRIOR [948]

While nuclear energy does not pollute the environment, it poses the risk of radiation which is harmful to organisms because it causes lethal mutations.

Explanation:

Nuclear fission, for example, releases neutrons and other particles (at very high speeds) that can ionize materials including DNA. This will induce mutations of DNA most of which are usually lethal to organisms. Gamma and X- rays are also produced by fusion reactions and if exposed to organisms also cause mutations on DNA through double stranded breaks. Therefore, the risk of an accident of a nuclear reactor can have immense ramifications on the ecosystems.

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3 years ago

Why does the dehydration of an alcohol more often use concentrated sulfuric acid, H 2 S O 4 HX2SOX4, as the acid catalyst rather

Dimas [21]

KAnswer:

See explanation

Explanation:

It is more common to use H2SO4 for dehydration reaction rather than HCl because HCl contains a good nucleophile,the chloride ion.

Owing to the presence of the chloride ion, a substitution reaction involving the chloride ion may also proceed also thereby affecting the elimination reaction.

Also, concentrated H2SO4 is a very good drying agent thus, as long as it is used, the alcohol substrate is completely dehydrated to yield the alkene.

Note that HCl is not a dehydrating agent.

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2 years ago

Which of these molecules is an important source of ENERGY for most organisms?

BabaBlast [244]

Answer:

ATP

Adenosine 5'-triphosphate, or ATP, is the most abundant energy carrier molecule in cells. This molecule is made of a nitrogen base (adenine), a ribose sugar, and three phosphate groups.

Explanation:

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7 0

3 years ago

The activation energies are 45. 3 kj mol^-1 for k1 and 69. 8 kj mo1-1 for k2. If the rate constants are equal at 320 k, at what

Katyanochek1 [597]

At temperature 298K, the value of k1/k2 will equal to 2.00

According to Arrhenius's equation

Sometimes the Arrhenius equation is written as k = Ae- $^{E/RT}$ , where k is the rate of the chemical reaction, A is a constant that varies depending on the chemicals involved, E is the activation energy, and R is the universal gas constant, and T is the temperature.

$\frac{k1}{k2} = \frac{A_{1} e^{-E_{a1}/ RT} }{A_{2} e^{-E_{a2}/ RT} }$

= $\frac{A1}{A2} e^{(E_{a2}-E_{a1)}/RT }$

Given

Eₐ₂ = 69.8 × 10³ J/mol

Eₐ₁ = 45.3 × 10³ J/mol

R = 8.314J/kmol³

Now if the rate constant is equal means K1/K2 = 1 at T = 320 K

So if we put the values of K1/K2, Ea2,Ea1, T, and R into the formula

On solving

We get

A1/A2 = 1.001 × 10⁻⁴

Now when K1/K2 = 2

Then if we put the value of A1/A2, Ea1, Ea2, R, K1/K2 in the same equation,

On solving we get

T = 298 K

Hence, At temperature 298K k1/k2 will equal to 2.00

Learn more about Arrhenius's equation here brainly.com/question/26724488

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5 0

1 year ago