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3 years ago

In the nucleus ______________ tell cells what to do and how to change.

Physics

1 answer:

anyanavicka [17]3 years ago

7 0

Answer:

i believe it is dna

Explanation:

if i remember correctly if the dna tells the cell what to do and how to do it

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A 12.5843-gram sample of metal bromide, MBr4, was dissolved and, after reaction with silver nitrate, AgNO3, all of the bromide w

barxatty [35]

Answer:

zirconium

Explanation:

Given, Mass of AgBr(s) = 23.0052 g

Molar mass of AgBr(s) = 187.77 g/mol

The formula for the calculation of moles is shown below:

$Moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles\ of\ AgBr= \frac{23.0052\ g}{187.77\ g/mol}$

$Moles\ of\ AgBr= 0.1225\ mol$

The reaction taking place is:

$MBr_4+4AgNO_3\rightarrow 4AgBr+M(NO_3)__4$

From the reaction,

4 moles of AgBr is produced when 1 mole of $MBr_4$ undergoes reaction

1 mole of AgBr is produced when 1 / 4 mole of $MBr_4$ undergoes reaction

0.1225 mole of AgBr is produced when $\frac {1}{4}\times 0.1225$ mole of $MBr_4$ undergoes reaction

Moles of $MBr_4$ got reacted = 0.030625 moles

Mass of the sample taken = 12.5843 g

Let the molar mass of the metal = x g/mol

So, Molar mass of $MBr_4$ = x + 4 × 79.904 g/mol = 319.616 + x g/mol

Thus,

$0.030625 = \frac{12.5843}{319.616 + x}$

Solve for x,

we get, x = 91.2999 g/mol

<u>The metal shows +4 oxidation state and has mass of 91.2999 g/mol . The metals is zirconium.</u>

8 0

3 years ago

If the velocity of the incident charged particle were doubled, how would b have to change (keeping all other parameters constant

Paraphin [41]

If you double the velocity you would have to halve the magnetic field strength to keep the force on the particle the same and hence the trajectory.

F = qvB

6 0

3 years ago

Using newtons 2nd law, explain The relationship between acceleration, mass, and force.

shtirl [24]

According to Newton's second law of motion, Force is mass times the acceleration of the object.

It would be: F = m*a

Hope this helps!

8 0

3 years ago

If 1 kilogram is = 1000 Grams, how many kilograms is an objecct with a mass of 7000 grams?

ratelena [41]

Answer:

Explanation:

If the mass of the object is 7000 grams then you would need to divide 7000 by 1000 to get your answer which would be 7 kilograms

Answer: 7

3 0

3 years ago

Read 2 more answers

a large punch bowl holds 3.95 kg of lemonade (which essentially is water) at 20.0 degrees celsius. A 45 gram ice cube at -10.2 d

TEA [102]

Answer: $19 ^{\circ}$

Explanation:

Given

mass of water $(m_w) 3.95 kg$

Temperature of water is $20^{\circ} C$

mass of ice $(m_i) =45 gm$

Temperature of ice $=-10.2 ^{\circ} C$

specific heat of water $4.18 kJ/kg-K$

specific heat of ice $2.22 kJ/kg-K$

Latent heat of fusion(L) $3.4\times 10^5 J/kg$

Heat absorb by water when ice completely converts to water

$Q=mc_{ice}\delta T+mL$

$Q=0.045\times 2.22\times (0+10.2)+0.045\times 3.4\times 100$

Q=1.01898+15.3=16.3189 KJ

thus temperature of water will be

$3.95\times 4.18\times (20-T)=16.3189$

$T=19.011\approx 19^{\circ} C$

7 0

4 years ago