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3 years ago

Please help me!! Look at the picture to understand the question please!

Chemistry

1 answer:

Romashka-Z-Leto [24]3 years ago

5 0

Answer:

C. I

Explanation:

The elements are categorized in groups and periods. The periods are horizontal and the groups are vertical. The elements in the same group (vertical) have very similar characteristics.

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If anyone has done the edge acids and bases lab please help me it would be deeply appreciated

Flauer [41]

Answer:

Do you mean a biology lab

Explanation:

what's the question

7 0

3 years ago

Which is a process that causes an organism’s poorly suited characteristics to disappear?

rusak2 [61]

The answer to your question is c , Natural selection

4 0

3 years ago

A student determines the density of an element to be 2.73 g/cm 3 . If the accepted value is 2.70 grams per cm 3 , what is the st

Brums [2.3K]

Answer:

Explanation:

percentage error = error x 100 / correct value

= (2.73 - 2.70) x100 / 2.70

= 1.11 %

The element is Aluminium whose density is 2.702 grams / cc

Boiling point of Aluminium = 2519⁰C .

8 0

3 years ago

PLZ HELP "NO LINKS"

Natalka [10]

Answer: (a) Mole fraction of $H_{2}$ is 0.66.

Mole fraction of $N_{2}$ is 0.33

(b) The partial pressure of $H_{2}$ is 1.98 atm.

The partial pressure of $N_{2}$ is 0.99 atm.

(c) The total pressure is 3.0 atm

Explanation:

Given: Volume = $22.4 dm^{3}$ (1 $dm^{3}$ = 1 L) = 22.4 L

Moles of $H_{2}$ = 2.0 mol

Moles of $N_{2}$ = 1.0 mol

Total moles = (2.0 + 1.0) mol = 3.0 mol

Temperature = 273.15 K

Now, using ideal gas equation the total pressure is calculated as follows.

$PV = nRT\\$

where,

P = pressure

V = volume

n = number of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

$PV = nRT\\P \times 22.4 L = 3.0 mol \times 0.0821 L atm/mol K \times 273.15 K\\P = 3.0 atm$

The mole fractions of each component:

The mole fraction of $H_{2}$ is calculated as follows.

$Mole fraction = \frac{moles of H_{2}}{moles of H_{2} + moles of N_{2}}\\= \frac{2.0 mol}{(2.0 + 1.0) mol}\\= 0.66$

The mole fraction of $N_{2}$ is as follows.

$Mole fraction = \frac{moles of N_{2}}{moles of H_{2} + moles of N_{2}}\\= \frac{1.0 mol}{(2.0 + 1.0) mol}\\= 0.33$

The partial pressures of each component:

Partial pressure of $H_{2}$ are as follows.

$P_{H_{2}} = P_{total} \times mole fraction of H_{2}\\= 3.0 atm \times 0.66\\= 1.98 atm$

Partial pressure of $N_{2}$ are as follows.

$P_{N_{2}} = P_{total} \times mola fraction of N_{2}\\= 3.0 atm \times 0.33\\= 0.99 atm$

7 0

3 years ago

Consider the following voltaic cell:(b) In which half-cell does oxidation occur?

damaskus [11]

At the anode, half-cell oxidation occurs in a voltaic cell.

<h3>Voltaic Cell Principle</h3>

A voltaic cell generates electricity due to the Gibbs free energy of spontaneous redox processes occurring inside the cell, which is the basis for the voltaic cell's operating principle.

Two half-cells plus a salt bridge make up the voltaic cell. An electrolyte-immersed metallic electrode is present on each side of the cell. These two half-cells are wired together to form a connection to a voltmeter.

<h3>Voltaic Cell Parts</h3>

Copper makes comprises the cathode of a photovoltaic cell. This electrode serves as the cell's positive terminal, where reduction takes place.
Anode: Zink metal makes up this electrode. It creates the cell's negative electrode, where oxidation takes place.
Oxidation and reduction are divided into two discrete parts in two half-cells.
Salt Bridge: It contains the electrolytes needed to finish the circuit in the voltaic cell.
The flow of electrons between the electrodes occurs via the external circuit.

Learn more about Voltaic cells here:-

brainly.com/question/27908270

#SPJ4

6 0

2 years ago