Explanation

In the modern periodic table, there are 18 groups (vertical columns) and 7 periods (horizontal rows).

Explanation

Cholesteryl benzoate is an example of a liquid crystal.

Explanation

The relative lowering of vapor pressure is given by the formula: 

Relative lowering of vapor pressure = (Mole fraction of solute)/(Mole fraction of solvent + Mole fraction of solute)

Calculating the mole fractions:

Moles of glucose = (18 g / 180 g/mol) = 0.1 mol 

Moles of water = (90 g / 18 g/mol) = 5 mol

Mole fraction of glucose = 0.1 / (0.1 + 5) = 0.02 

Mole fraction of water = 1 - 0.02 = 0.98 

Substituting into the formula:

Relative lowering of vapor pressure = 0.02 / (0.02 + 0.98) = 0.02 / 1 = 0.02 

Therefore, the relative lowering of vapor pressure is 0.02, which is equivalent to 1/50. 

Explanation

The discomfort of breathing in an unpressurized cabin is due to a Low pressure of O2.

Explanation

Benzene is the archetypical aromatic compound.

It is planar, bond angles=120º, all carbon atoms in the ring are sp2 hybridized, and the pi-orbitals are occupied by 6 electrons.

Explanation

In voltammetry, diffusion current is measured as a function of scanning potential difference.

Explanation

Urea fertilizer contains 46% nitrogen (N).

Urea is a white crystalline solid that is widely used as a fertilizer and animal feed additive.

Explanation

The value of absolute zero is -273°C.

It is the theoretical temperature where all molecular motion stops.

It is equivalent to 0 Kelvin in the Kelvin temperature scale.

Explanation

Blood has a pH level of around 7.3, which is closest to neutral (pH 7).

Explanation

Competes with substrate

(In competitive inhibition, the inhibitor competes with the substrate for binding to the active site of the enzyme.)