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3 years ago

Why do chromosomes condemce before cell division

1 answer:

8 0

Answer:This condensation is needed to allow the chromosomes to move along the mitotic spindle without becoming tangled or broken during their distribution to daughter cells. DNA in this highly condensed state can no longer be transcribed, so all RNA synthesis stops during mitosis.

Explanation: This condensation is needed to allow the chromosomes to move along the mitotic spindle without becoming tangled or broken during their distribution to daughter cells. DNA in this highly condensed state can no longer be transcribed, so all RNA synthesis stops during mitosis.

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When an atom of oxygen, atomic number 8, forms an ion what is the overall charge of that

lesya [120]

A. 1-

Explanation:

When an atom of oxygen with an atomic number of 8 forms an ion, the overall charge on it will be -1

When atoms from ions, they either lose or gain electrons in the process.

If an atom loses electrons, they become positively charged.

When they gain electrons, they become negatively charged.

An atom is made up of three fundamental particles;

Protons the positively charged particles

Electrons are negatively charged

Neutrons do not carry any charges.

In a neutral atom, the number of protons and electrons are the same

When an atom gains electrons, the number of electrons in it increases and it becomes negatively charged.

When they lose electrons, the number of protons is more and they become positively charged.

Oxygen atoms prefers to gain electrons in order to have a complete octet. When they gain an electron;

With the atomic number of 8:

Number of proton = 8

Number of electrons = 9

Charge = 8-9 = -1

We can represent this as O¹⁻

Ideally, oxygen prefers to gain two electrons to mimic the structure of the noble gas Neon.

Learn more:

Anions in binary compounds brainly.com/question/11041787

Anions brainly.com/question/4670413

#learnwithBrainly

4 0

4 years ago

Balance Na2CrO4 + AlPO4

Sonbull [250]

Answer:

2Na3PO4 + Al2(CrO4)3

Explanation:

these are the products

3 0

3 years ago

What is the percent by mass of ca in ca3p2?

goblinko [34]

Ca=40g
P=31g
Ca3=120g
P2=62g
Ca3P2=182g
Ca3/Ca3p2=120/182=0.6593=approximately 65.93%

7 0

3 years ago

An atom of helium has a radius of 31. pm and the average orbital speed of the electrons in it is about 4.4x 10 m/s Calculate the

otez555 [7]

The question is incomplete, here is the complete question:

An atom of helium has a radius of 31. pm and the average orbital speed of the electrons in it is about $4.4\times 10^6m/s$ . Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of helium. Write your answer as a percentage of the average speed, and round it to 2 significant digits

<u>Answer:</u> The percentage of average speed is 41 %

<u>Explanation:</u>

We are given:

Radius of helium atom = 31 pm = $31\times 10^{-12}m$ (Conversion factor: $1m=10^{12}pm$ )

So, diameter of helium atom = $(2\times r)=(2\times 31\times 10^{-12})=64\times 10^{-12}m$

The diameter of the atom will be equal to the uncertainty in position.

The equation representing Heisenberg's uncertainty principle follows:

$\Delta x.\Delta p=\frac{h}{2\pi}$

where,

$\Delta x$ = uncertainty in position = d = $64\times 10^{-12}m$

$\Delta p$ = uncertainty in momentum = $m\Delta v$

m = mass of electron = $9.1095\times 10^{-31}kg$

h = Planck's constant = $6.627\times 10^{-34}kgm^2/s^2$

Putting values in above equation, we get:

$64\times 10^{-12}m\times 9.1095\times 10^{-31}kg\times \Delta v=\frac{6.627\times 10^{-34}kgm^2/s}{2\times 3.14}\\\\\Delta v=\frac{6.627\times 10^{-34}kgm^2/s^2}{2\times 3.14\times 64\times 10^{-12}m\times 9.1095\times 10^{-31}kg}=1.81\times 10^6m/s$

To calculate the percentage of average speed, we use the equation:

$\text{Percentage of the average speed}=\frac{\text{Uncertainty in velocity}}{\text{Average orbital speed}}\times 100$

We are given:

Average orbital speed = $4.4\times 10^6m/s$

Putting values in above equation, we get:

$\text{Percentage of the average speed}=\frac{1.81\times 10^6m/s}{4.4\times 10^6m/s}\times 100\\\\\text{Percentage of the average speed}=41.\%$

Hence, the percentage of average speed is 41 %

3 0

4 years ago

A compass needle normally points toward Earth’s magnetic pole, which is near the North Pole. Which best explains why the needle

Mariana [72]

Answer:

Magnetism surrounding the wire draws the needle toward the wire.

Explanation:

Magnetism is a force which is responsible for the attraction and repulsion of objects. Magnetism is also generated around the wire in which current is flowing. This magnetism is stronger when more current flows through the wire. This magnetism is stronger than the magnetism of the poles so when the compass brought near to the electric wire, the needle moves toward the wire.

8 0

3 years ago

Read 2 more answers

Why do chromosomes condemce before cell division ​

Why do chromosomes condemce before cell division