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3 years ago

Choose the element described by the following electron configuration. 1s22s22p63s23p64s1

Chemistry

2 answers:

Sholpan [36]3 years ago

4 0

Answer:

Potassium

Explanation:

We are going to assume that this is an atom in it's ground state, not an ion.

Now let us count all the electrons

2 in the 1s orbital

2 in the 2s orbital

6 in the 2 p orbital

2 in the 3s orbital

6 in the 3p orbital

1 in the 4s orbital

Add them all up and we get 19. The element with 19 protons and hence 19 electrons in potassium

Jobisdone [24]3 years ago

3 0

Hey there.

By adding up all the "exponents," you'll get a number of 19. By looking at a periodic table, the element of such an atomic number is potassium or K.

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A student dissolves of glucose in of a solvent with a density of . The student notices that the volume of the solvent does not c

nikitadnepr [17]

Answer:

0.052 M

0.059 m

Explanation:

There is some missing info. I think this is the complete question.

<em>A student dissolves 4.6 g of glucose in 500 mL of a solvent with a density of 0.87 g/mL. The student notices that the volume of the solvent does not change when the glucose dissolves in it. Calculate the molarity and molality of the student's solution. Round both of your answers to 2 significant digits.</em>

Step 1: Calculate the moles of glucose (solute)

The molar mass of glucose is 180.16 g/mol.

4.6 g × 1 mol/180.16 g = 0.026 mol

Step 2: Calculate the molarity of the solution

0.026 moles of glucose are dissolved in 500 mL (0.500 L) of solution. We will use the definition of molarity.

M = moles of solute / liters of solution

M = 0.026 mol / 0.500 L = 0.052 M

Step 3: Calculate the mass corresponding to 500 mL of the solvent

The solvent has a density of 0.87 g/mL.

500 mL × 0.87 g/mL = 435 g = 0.44 kg

Step 4: Calculate the molality of the solution

We will use the definition of molality.

m = moles of solute / kilograms of solvent

m = 0.026 mol / 0.44 kg = 0.059 m

4 0

2 years ago

How can one describe the bond between the two atoms of hydrogen to the one atom of oxygen within a molecule of water (h2o)?

Digiron [165]

There are O-H bonds in H2O. They have the intramolecular force of polar covalent bond.

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3 years ago

What is the democritus findings?

Volgvan

nvm

4 0

2 years ago

2.0 kg of carbon is heated from 25°C to 55°C, and absorbs 42600 joules of heat in the process.

Marrrta [24]

Answer: c = 710 J/kg°C or 0.71 J/g°C

Explanation: Heat is expressed in the formula Q = mc∆T. Derive to find the specific heat c. So the formula will become c = Q / m∆T

c = Q / m∆T

= 42600 J / 2 kg ( 55°C - 25°C )

= 710 J /kg°C

Or can be expressed by converting kg to g.

c = 0.71 J /g°C

6 0

3 years ago

Read 2 more answers

Describe the characteristics of the moon and the Earth for each phase of the

Yuri [45]

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The Moon doesn't make its own light, it just reflects the Sun's light as all the planets do. The Sun always illuminates one half of the Moon. Since the Moon is tidally locked, we always see the same side from Earth, but there's no permanent "dark side of the Moon." The Sun lights up different sides of the Moon as it orbits around Earth – it's the fraction of the Moon from which we see reflected sunlight that determines the lunar phase.

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3 years ago