Explanation

The physical methods used to measure physical properties are called Gravimetric analysis methods.

This technique involves measuring the mass of a substance to determine its concentration or quantity.

Explanation

The flame test is a qualitative analysis technique used to identify certain elements based on the color they produce when heated in a flame.

In the case of copper halides (such as copper chloride or copper bromide), the flame test produces a bluish-green color, which indicates the presence of copper.

Explanation

Organic qualitative analysis deals with the identification of functional groups in organic compounds.

Functional groups are specific groups of atoms within a molecule that determine its chemical properties and reactivity.

Explanation

In qualitative analysis, a sample can be a solid, liquid, gas, or a mixture.

A mixture is a physical combination of two or more substances, where each substance retains its chemical properties.

Explanation

The Analytical Chemistry deals with instruments and methods to separate, identify, and quantify the matter.

Explanation

Sodium carbonate is also known as washing soda.

It is commonly used to remove permanent hardness from water.

It reacts with calcium and magnesium ions, which are the causes of permanent hardness, to form precipitates that can be removed from the water.

Explanation

Water is neutral and does not have a taste.

The taste buds on our tongues can detect five basic tastes: sweet, sour, salty, bitter, and umami (savory).

Water does not contain any molecules that stimulate these taste buds, making it tasteless.

Explanation

Temporary hardness is caused by:

• Calcium bicarbonate — Ca(HCO₃)₂
• Magnesium bicarbonate — Mg(HCO₃)₂
• Release Ca²⁺ and Mg²⁺ in water.
• Removed by boiling → form insoluble CaCO₃, MgCO₃.
• Permanent hardness (sulfates/chlorides) can't be removed by boiling.

Explanation

The permanent hardness of water is due to the presence of MgSO₄ (magnesium sulfate).

Permanent hardness is caused by dissolved minerals like calcium sulfate (CaSO₄) and magnesium sulfate, which cannot be removed by boiling the water.

Explanation

Polio is also known as poliomyelitis.

It is a disease caused by the poliovirus.

The virus is usually spread through the fecal-oral route, which includes through contaminated water and food.