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

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

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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:

Mg + 1/2O₂ → MgO,

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.

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

Using cross multiplication:

1.0 mole of Mg produce → 1.0 mol of MgO.

∴ 0.565 mol of Mg produce → 0.565 mol of MgO.

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

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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

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

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