Which of the following is a physical change?

A molecule in which the central atom forms three single bonds and has one lone pair is said to have a ________ shape.

nignag [31]

Answer : The correct option is, (c) pyramidal

Explanation :

As we are given that a molecule in which the central atom forms three single bonds and has one lone pair that means the central metal atom has 3 bond pairs and 1 lone pair of electrons.

There are total 4 electron pairs. So, the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

But as there are three atoms or bonds around the central atom and the fourth position occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be pyramidal.

Hence, correct option is, (c) pyramidal

5 0

3 years ago

Some compounds are better known by their common names than by their systematic chemical names. Give the chemical formulas of the

kondaur [170]

Explanation:

(a) Dry ice is solid carbon dioxide and its chemical formula is solid $CO_{2}$ .

(b) Sodium chloride is commonly known as salt in daily life. Hence, chemical formula of salt is NaCl.

(c) Laughing gas is also known as dinitrogen monoxide. Hence, its chemical formula is $N_{2}O$ .

(d) Marble (chalk limestone) is chemically known as calcium carbonate. Hence, its chemical formula is $CaCO_{3}$ .

(e) Baking soda is chemically known as sodium bicarbonate. Hence, its chemical formula is $NaHCO_{3}$ .

(f) Ammonia has a chemical formula as $NH_{3}$ .

(g) Water has a chemical formula as $H_{2}O$ .

(h) Milk of magnesia is a base and it is chemically known as magnesium hydroxide. Its chemical formula is $Mg(OH)_{2}$ .

(i) Epsom salt is most often found as heptahydrate of sulfate mineral epsomite. Its chemical formula is usually $MgSO_{4}.7H_{2}O$ . If not present as a heptahydrate then its chemical formula is $MgSO_{4}.(H_{2}O)_{x}$ where, value of x can be equal to 0 to 7.

5 0

3 years ago

Initially, a 55.0 liter compressible container, holding 2.4 moles of a gas, exerts a pressure of 760 millimeters of mercury at a

Bingel [31]

You would have to use the ideal gas law for this:
PV=nRT
Pressure, Volume, n=moles, R gas constant, Temperature in Kelvin
P=nRT/V
(1.8mol)(62.36)(309K)/43.0L = 805mm Hg

5 0

2 years ago

Read 2 more answers

Heptane and water do not mix, and heptane has a lower density (0.684 g/mL) than water (1.00 g/mL). A 100-mL graduated cylinder w

kicyunya [14]

Answer:

$h=100.8cm$

Explanation:

Hello,

In this case, considering the density and mass of both water and heptane we first compute the volume of each one:

$V_{water}=\frac{m_{water}}{\rho _{water}}=\frac{34g}{1.00g/mL}=34mL\\ \\V_{heptane}=\frac{m_{heptane}}{\rho _{heptane}}=\frac{34.6g}{0.684g/mL}=50.6mL\\$