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3 years ago

Please help is for today

Chemistry

1 answer:

love history [14]3 years ago

5 0

Answer:

Our bodies are designed to regulate our temperature. When it's cold outside, your body makes sure to keep the blood flowing to your core and vital organs to keep them warm. This can change the amount of blood flow to your hands and feet, making them feel cold

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Problem page in each of the molecules drawn below one chemical bond is colored red. decide whether this bond is likely to be pol

Slav-nsk [51]

The question is incomplete, here is the complete question:

Problem page in each of the molecules drawn below one chemical bond is colored red. Decide whether this bond is likely to be polar or not. if the bond is likely to be polar, write down the chemical symbol for the atom which will have more negative charge.

The image is attached below.

Answer:

For carbon dioxide molecule: The bond is considered as polar and the elecvtronegative atom is oxygen.

For water molecule: The bond is considered as polar and the elecvtronegative atom is oxygen.

Explanation:

There are two types of covalent bonds:

Polar covalent bond: This bond is formed when difference in electronegativity between the atoms is present. When atoms of different elements combine, it results in the formation of polar covalent bond. For Example: $CO_2,NO_2$ etc..
Non-polar covalent bond: This bond is formed when there is no difference in electronegativity between the atoms. When atoms of the same element combine, it results in the formation of non-polar covalent bond. For Example: $N_2,O_2$ etc..

In carbon dioxide molecule:

The given bond is present between C and O atom.

Electronegativity value of C = 2.5

Electronegativity value of O = 3.5

Electronegativity difference = (3.5 - 2.5) = 1

As, electronegativity difference is present. So, the bond is considered as polar and the elecvtronegative atom is oxygen.

In water molecule:

The given bond is present between H and O atom.

Electronegativity value of H = 2.1

Electronegativity value of O = 3.5

Electronegativity difference = (3.5 - 2.1) = 1.4

As, electronegativity difference is present. So, the bond is considered as polar and the elecvtronegative atom is oxygen.

8 0

3 years ago

Type the correct answer in each box. In an atom, the first energy level can hold electrons. The second energy level can hold ele

Dimas [21]

1st energy level can hold 2 electrons
2nd energy level can hold 8 electrons
3rd energy level can hold 8 or 18 electrons

7 0

3 years ago

Read 2 more answers

An air conditioning unit turns off once it reaches its goal temperature. The house warms up and the air conditioning unit turns

-Dominant- [34]

Answer:

D ) feedback

Explanation:

When we use an air conditioner, it get turn off when reaches its required temperature and when the house warm up the air conditioning unit turns on again, that is an example of feedback.

The given condition is an example of negative feedback because in negative feedback, any change in the input is opposed by generating an output. Here also, warming up of house (change in one direction) allows the air conditioning unit turns on and it gives cool air (opposing that change).

Hence, the correct option is "D".

4 0

3 years ago

Draw the Lewis structure for the compound beryllium nitride, with chemical formula Be3N2

babunello [35]

Answer:online research

Explanation:

5 0

3 years ago

15.

Vladimir [108]

Answer:

Mass = 1.84 g

Explanation:

Given data:

Total pressure = 3.44 atm

Volume of flask = 9.62 L

Temperature = 63°C = 63+273.15K = 336.15 K

Mass of CO₂ = 12.5 g

Mass of hydrogen = ?

Solution:

Number of moles of CO₂:

Number of moles = mass/molar mass

Number of moles = 12.5 g/ 44 g/mol

Number of moles = 0.28 mol

Pressure of CO₂:

PV = nRT

R = general gas constant = 0.0821 atm.L/mol.K

P = 0.28 mol × 0.0821 atm.L/mol.K × 336.15 K / 9.62 L

P = 7.73 atm.L/ 9.62 L

P = 0.8 atm

Total pressure = Partial pressure of CO₂ + Partial pressure of H₂

3.44 atm = 0.8 atm + P(H₂)

P(H₂) = 3.44 atm - 0.8 atm

P(H₂) = 2.64 atm

Number of moles of hydrogen:

PV = nRT

2.64 atm × 9.62 L = n × 0.0821 atm.L/mol.K × 336.15 K

25.39 atm.L = n × 27.59atm.L/mol

n = 25.39 atm.L / 27.59atm.L/mol

n = 0.92 mol

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 0.92 mol × 2 g/mol

Mass = 1.84 g

5 0

3 years ago