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3 years ago

the compound nacI is an example of a /an.. (A)covalent bond (B)Ionic bond (C) Metallic bond (D) none of the above

Chemistry

1 answer:

Misha Larkins [42]3 years ago

8 0

The answer should be B, ionic bond.

Ionic bond is the bonding between a metal and a non-metal. While covalent bond is the bond between non-metals, and metallic bond is the bond between metals.

Since Na, sodium, is a metal, and Cl, chlorine, is a non-metal, the bond formed between them is an ionic bond. Sodium gives up an electron to chlorine inside this bonding.

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How does science help us protect our nations resources.

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By showing what resources the planet had to offer

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3 years ago

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Question 1 How many grams are equal to 3.4 moles of carbon dioxide?

ddd [48]

Answer:

149.6 grams

Explanation:

Mass in gram = molar mass * number of moles

Massof CO2 in gram = 44*3.4=149.6 grams

4 0

3 years ago

you have to prepare a ph 5.03 buffer, and you have the following 0.10m solutions available: hcooh, hcoona, ch3cooh, ch3coona, hc

TiliK225 [7]

Solution :

The buffer is the one that contains weak acid (the $\text{pK}_a$ is nearly equal to the required pH) and the salt of its conjugate base.

The $\text{pK}_a$ values of the given weak acids are as follows :

HCOOH : $\text{pK}_a$ = 3.744

$CH_3COOH : pK_a = 4.756$

HCN : $\text{pK}_a$ = 9.21

Since the required pH is 5.03, the suitable buffer is the mixture of the acetic acid and the salt of its conjugate base.

Let suppose the volumes of $CH_3COOH$ and $CH_3COONa$ are x and y mL respectively.

So the total volume of the buffer is 1000 mL.

∴ x+ y = 1000 ................(1)

Writing the Henderson-Hasselbalch equation for the given buffer solution :

$pH = pK_a + \log \ \frac{[CH_3COONa]}{[CH_3COOH]}$ .............(2)

$5.03 = 4.756 + \log \ \frac{\left(\frac{y \ mL \times 0.10 \ M}{(x+y) \ mL}\right)}{\left(\frac{x \ mL \times 0.10 \ M}{(x+y) \ mL}\right)}$

$5.03 = 4.756+ \log \frac{y}{x}$

$\frac{y}{x}=10^{5.03-4.756}$

y = 1.9 x

Substituting the values of y in equation (1), we get

x + 1.9 x = 1000

x = 345

Putting the value of x in (1), we get

345 + y = 1000

y = 655

Therefore the volume of $CH_3COOH$ is 345 mL and the volume of $CH_3COONa$ is 655 mL.

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3 years ago

Using complete subshell notation (not abbreviations, 1s 22s 22p 6 , and so forth), predict the electron configuration of each of

dybincka [34]

Answer: The electronic configuration of the elements are written below.

Explanation:

Electronic configuration is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom is determined by the atomic number of that atom.

For the given options:

Option a: Carbon (C)

Carbon is the 6th element of the periodic table. The number of electrons in carbon atom are 6.

The electronic configuration of carbon is $1s^22s^22p^2$

Option b: Phosphorus (P)

Phosphorus is the 15th element of the periodic table. The number of electrons in phosphorus atom are 15.

The electronic configuration of phosphorus is $1s^22s^22p^63s^23p^3$

Option c: Vanadium (V)

Vanadium is the 23rd element of the periodic table. The number of electrons in vanadium atom are 23.

The electronic configuration of vanadium is $1s^22s^22p^63s^23p^64s^23d^3$

Option d: Antimony (Sb)

Antimony is the 51st element of the periodic table. The number of electrons in antimony atom are 51.

The electronic configuration of antimony is $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^3$

Option e: Samarium (Sm)

Samarium is the 62nd element of the periodic table. The number of electrons in samarium atom are 62.

The electronic configuration of samarium is $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^6$

Hence, the electronic configuration of the elements are written above.

4 0

3 years ago

Examples of chemical and physical changes

amm1812

Answer:

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding

Explanation:

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3 years ago

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