Explanation

The correct answer is: Molecules do not collide with one another

Gas molecules:

• Are widely separated
• Have low attractive forces
• Are free to move in any direction
• Collide with one another

Explanation

There are three main scales used to measure temperature:

1. Celsius scale: Water freezes at 0°C and boils at 100°C.
2. Fahrenheit scale: Water freezes at 32°F and boils at 212°F.
3. Kelvin scale: Absolute zero (the theoretical minimum temperature) is 0K, and water freezes at 273.15K and boils at 373.15K.

Explanation

• Liquids can be converted into gases by heating, a process known as vaporization or evaporation.
• As the temperature increases, the particles of the liquid gain energy and move faster, eventually breaking free from the surface tension of the liquid and turning into a gas.

Explanation

The oxidation of glucose to gluconic acid is a reaction that involves the loss of two electrons:

C6H12O6 (glucose) → C6H12O7 (gluconic acid)

Explanation

• The statement that is not true about the precision of data is: "It is the difference between the obtained value and the true value."

Explanation

• The given reaction (CH4 + Cl2 → CH3Cl + HCL) is an example of a free radical substitution reaction.
• Free radical reactions typically exhibit a constant rate over time, regardless of the concentration of the reactants.
• Therefore, the order of this reaction is Zero order.
  

Explanation

The atomic weight of Mercury (Hg) is 200.59 unified atomic mass units (u), as listed on the periodic table.

Key Information:

• Symbol: Hg (from Latin Hydrargyrum)
• Atomic Number: 80
• Standard Atomic Weight: 200.592 u (often rounded to 200.59 u).

Explanation

Louis Pasteur (1822–1895) was a pioneering microbiologist and chemist whose work bridged both fields:

As a Chemist:

• Discovered molecular chirality (optical isomers).
• Studied fermentation, proving it was caused by microorganisms.

As a Microbiologist:

• Developed pasteurization (heat treatment to kill microbes in food).
• Created vaccines for rabies and anthrax.
• Disproved spontaneous generation (germ theory of disease).

Explanation

The Doppler effect is applicable to all types of waves, including sound waves, light waves, and even water waves.

It describes the change in frequency or wavelength of a wave when there is relative motion between the wave source and the observer. 

Explanation

 Protons are present in the nucleus of every atom, including hydrogen, which has 1 proton and no neutron in its most common isotope.

Neutrons are present in most nuclei except ordinary hydrogen (¹H).

Electrons are found in the electron cloud, outside the nucleus.

Positrons are antimatter particles, not normally found in atomic nuclei.