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2 years ago

Which type of fertilization is common with animals that live in the water?

Chemistry

2 answers:

Makovka662 [10]2 years ago

5 0

External fertilization in animals usually occurs in water or in damp areas in a process called spawning.

lutik1710 [3]2 years ago

4 0

The answer for this would be the first one external fertilization

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Which of the following definitions best fits the definition of an environmental factor of an organism's

Vaselesa [24]

Answer:

B.)

An environmental factor is a characteristic of the environment that changes how an organism interacts with the environment

Explanation:

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2 years ago

How many classes for a sample of households groceries?

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3 years ago

How many moles are in 2.0 grams of Na?

lisov135 [29]

Answer:

Explanation:

Sodium metal has a molar mass of

22.99

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2 years ago

The main factor which effects the speed of a sound wave is the ____

Radda [10]

Answer:

it depends on the medium and the temperature

Explanation:

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2 years ago

A sample of 28 Mg decays initially at a rate of 53500 disintegrations per minute, but the decay rate falls to 10980 disintegrati

prisoha [69]

Answer : The half life of 28-Mg in hours is, 6.94

Explanation :

First we have to calculate the rate constant.

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

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

where,

k = rate constant

t = time passed by the sample = 48.0 hr

a = initial amount of the reactant disintegrate = 53500

a - x = amount left after decay process disintegrate = 53500 - 10980 = 42520

Now put all the given values in above equation, we get

$k=\frac{2.303}{48.0}\log\frac{53500}{42520}$

$k=9.98\times 10^{-2}hr^{-1}$

Now we have to calculate the half-life.

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

$9.98\times 10^{-2}=\frac{0.693}{t_{1/2}}$

$t_{1/2}=6.94hr$

Therefore, the half life of 28-Mg in hours is, 6.94

8 0

3 years ago