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erik [133]
4 years ago
8

Nucleic acids_________?A)are energy-rich.B)are small molecules.C)store information.​

Chemistry
1 answer:
Svetach [21]4 years ago
8 0
I agree the answer is b
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A certain first-order reaction (a→products) has a rate constant of 9.60×10−3 s−1 at 45 ∘c. how many minutes does it take for the
Alexxandr [17]

The integrated rate law expression for a first order reaction is

ln\frac{[A_{0}]}{[A_{t}]}=kt

where

[A0]=100

[At]=6.25

[6.25% of 100 = 6.25]

k = 9.60X10⁻³s⁻¹

Putting values

ln\frac{100}{6.25}=9.6X10^{-3}t

taking log of 100/6.25

100/6.25 = 16

ln(16) = 2.7726

Time = 2.7726 / 0.0096 = 288.81  seconds

7 0
3 years ago
Read 2 more answers
When 16.3 g of magnesium and 4.52 g of oxygen gas react, how many grams of magnesium oxide will be formed? Identify the limiting
Tanzania [10]

Answer:

22.77 g.

he limiting reactant is O₂, and the excess reactant is Mg.

Explanation:

  • From the balanced reaction:

<em>Mg + 1/2O₂ → MgO,</em>

1.0 mole of Mg reacts with 0.5 mole of oxygen to produce 1.0 mole of MgO.

  • We need to calculate the no. of moles of (16.3 g) of Mg and (4.52 g) of oxygen:

no. of moles of Mg = mass/molar mass = (16.3 g)/(24.3 g/mol) = 0.6708 mol.

no. of moles of O₂ = mass/molar mass = (4.52 g)/(16.0 g/mol) = 0.2825 mol.

So. 0.565 mol of Mg reacts completely with (0.2825 mol) of O₂.

<em>∴ The limiting reactant is O₂, and the excess reactant is Mg (0.6708 - 0.565 = 0.1058 mol).</em>

<u><em>Using cross multiplication:</em></u>

1.0 mole of Mg produce → 1.0 mol of MgO.

∴ 0.565 mol of Mg produce → <em>0.565 mol of MgO.</em>

<em>∴ The amount of MgO produced = no. of moles x molar mass </em>= (0.565 mol)(40.3 g/mol) = <em>22.77 g.</em>

8 0
3 years ago
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What are two challenges posed by the near-vacuum of space?
cestrela7 [59]
It is a devoid of matter and gaseous pressure and atmospheric pressure.
3 0
3 years ago
Identify the term that matches each electrochemistry definition.
anygoal [31]

Answer: a. Cathode

b. Galvanic cell

c. Anode

d. Electrolytic cell

e. half reaction

Explanation:

Galvanic cell or Electrochemical cell is defined as a device which is used for the conversion of the chemical energy produced in a spontaneous redox reaction into the electrical energy.

Electrolytic cell is a device where electrical energy is used to drive a non spontaneous chemical reaction.

In the electrochemical cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.  Thus the electrons are produced at anode and travel towards cathode.

The balanced two-half reactions will be:

Oxidation half reaction : M\rightarrow M^{n+}+ne^-

Reduction half reaction : N^{n+}+ne^-\rightarrow N

Thus the overall reaction will be: M+N^{n+}\rghtarrow M^{n+}+N

4 0
3 years ago
List at least 10 ways in which you can save heat energy
guapka [62]

Answer:

Here are 10 ways to start conserving energy yourself:

Adjust your day-to-day behaviors

Replace your light bulbs

Use smart power strips

Install a programmable thermostat

Use energy efficient appliances

Reduce water heating expenses

Install energy efficient windows

Upgrade your HVAC system

Weatherize your home

Insulate your home

Explanation:

7 0
3 years ago
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