Explanation

• The normal body temperature is: 37°C.
• The average normal body temperature is generally accepted as 98.6°F (37°C).
• A temperature over 100.4°F (38°C) means you have a fever.

Additional Information:

• Hypothermia is the term used for temperature less than 36.50°C.
• Mild Pyrexia is the term used for temperature (99-100°F).
• Moderate Pyrexia is the term used for temperature (100-103°F).
• Severe Pyrexia is the term used for temperature (103-105°F).

Explanation

• Latent heat of fusion is the heat required to change ice into water at 0°C.
• For ice, it is approximately 80 cal/g.
• In SI units, it is about 334 J/g.
• During melting, the temperature remains constant.
• The heat is used to change the state of matter, not raise its temperature.

Explanation

• Pressure is a scalar quantity.
• Pressure can be defined as the force acting per unit area.
• The unit of pressure is N/m² (Newton per square meter).
• It is also called a pascal (Pa).
• In SI base units: kg⋅m−1⋅s−2
• Derivation from other quantities: p = F / A
• Dimensional unit: M L^−1 T^-2.

Explanation

• Boyle’s Law states that pressure and volume are inversely proportional.
• It applies when temperature remains constant.
• Formula: P∝ 1/v
• Therefore, PV = constant
• If volume decreases, pressure increases, and vice versa.

Explanation

• Phase change: Ice turns from a solid into a liquid.
• Melting point: The constant temperature at which this change happens is 0 degrees Celsius (32 degrees Fahrenheit)
• Heat absorption: Ice takes in heat energy to break its rigid crystal structure
• Constant temperature: The temperature stays at 0 °C until all the ice melts.

Explanation

• Aluminium is more reactive than silver.
• Aluminium forms very stable compounds with oxygen.
• Therefore, it requires electrolysis for extraction.
• Silver is less reactive and is easier to extract from its ores.
• Hence, aluminium extraction is more difficult than silver extraction.

Explanation

• The sum of the powers (exponents) of reactant concentrations in the rate law gives the reaction order.
• For example: Rate = k[A]^2[B]
• Overall order = 2 + 1 = 3.
• Reaction order shows how the rate depends on concentration.
• It is determined experimentally, not directly from the balanced chemical equation.

Explanation

• The nucleus is the central core of an atom.
• It contains protons and neutrons.
• Protons have a positive charge.
• Neutrons have no charge.
• Electrons move around the nucleus.

Explanation

• Ammonia is produced by the Haber process.
• The reaction is: N₂ + 3H₂ ⇌ 2NH₃.
• There are 4 moles of gas on the left and 2 moles on the right.
• Increasing pressure shifts the equilibrium toward ammonia.
• Therefore, higher pressure increases ammonia production.

Explanation

• Snow will stop in a week
• A is used before a singular countable noun.
• “Week” is a singular countable noun.
• “In a week” means within or after one week.