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3 years ago

Identify the folded membranes that move materials around the cell

1 answer:

7 0

The ER takes up a lot of space in some cells<span>. The endoplasmic reticulum may be “rough” or “smooth.” ER that has no attached ribosomes is called smooth endoplasmic reticulum. </span>

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Need help please i need a good grade will give more points if correctly answered

weeeeeb [17]

The answer is 5. Sulfur, iron, copper, gold, and aluminum are elements.

3 0

3 years ago

If 50,000. Joules are added to 5.00 kilograms of water at 12.0 degrees Celsius , what is the final temperature?

Citrus2011 [14]

Q= mcΔt
50000. J = (5000g)(4.18 J/g°C)(Δt)
Δt= final temp-initial temp
Δt= 2.39°C
2.39°C= final temp-12.0°C
Final temp= 14.39°C

7 0

3 years ago

Consider the following reaction of calcium hydride (CaH2) with molten sodium metal: CaH2(s) 2 Na(l) -> 2 NaH(s) Ca(l) Identif

pashok25 [27]

Answer:

None of the species in the equation have undergone either oxidation or reduction

Explanation:

The easiest way to see if oxidation or reduction has happened is to compare oxidation numbers of each and every species before and after the reaction.

Calcium is two before the reaction and two after the reaction

Hydrogen is -1 before the reaction and -1 after the reaction

Sodium is one before the reaction and one after the reaction

Iodine is -1 before the reaction and -1 after the reaction.

For an oxidation to happen an increase in oxidation number has to happen.

For a reduction to happen, a decrease in oxidation number has to happen. None have happened

8 0

3 years ago

What is an alpha particle?

alina1380 [7]

An alpha particle is a particle consisting of two protons and two neutrons. (Third option)

I hope this helped! c:

5 0

4 years ago

Read 2 more answers

A plutonium atom undergoes nuclear fission. Identify the missing element in the nuclear equation.

horrorfan [7]

Answer:

$_{92}^{226}U$

Explanation:

Let's firstly identify the atomic number (the number of protons) of Pu. This is done by referring to the periodic table and finding Pu. The atomic number of Pu is:

$Z=94$

In order to identify the type of a nuclear decay, we need to find the N/Z ratio. This is the ratio between the number of neutrons and the atomic number of an isotope. The number of neutrons is found by subtracting the number of protons from the mass number:

$N=M-Z$

That said, the N/Z ratio equation becomes:

$N/Z=\frac{M-Z}{Z}=\frac{M}{Z}-1=\frac{230}{94}-1=1.45$

This is a relatively high number thinking about the belt of stability of isotopes. Ideally, stable isotopes with a low Z value have an N/Z ratio of 1. Heavier isotopes with Z > 50 would have a slightly higher N/Z ratio and would be stable around N/Z = 1.25. This means we wish to decrease the N/Z ratio as much as possible.

Among all the decays, alpha-decay is preferred to decrease the N/Z ratio significantly (1.45 is much higher than 1.25). That said, we'll release an alpha particle with some nucleotide X of mass M and atomic number Z:

$_{94}^{230}Pu\rightarrow _Z^MX+_2^4\alpha$

According to the mass and charge conservation law:

$230=M+4\therefore M=230 - 4 = 226$

$94=Z+2\therefore Z = 94-2 = 92$

Identify an element with Z = 92 in the periodic table. This is uranium, U:

$_{92}^{226}U$

4 0

3 years ago