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Give two reasons why this flame is not suitable for heating.

Physics

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Answer

b

4 g/cm34 \text{ g/cm}^3

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Here are the solutions to the questions:

Part ii

Two reasons why a luminous flame is not suitable for heating are

  • It produces soot, which can blacken apparatus and contaminate substances.
  • It is less hot than a non-luminous flame, making heating less efficient.

Part iii

One safety measure when handling burning items in the laboratory is to use tongs or heat-resistant gloves to avoid direct contact.

26. Identify the parts marked R and Q:

  • R: Vagina
  • Q: Uterus

27. State the functions of the parts marked P and S:

  • P (Fallopian tube/Oviduct): Transports the egg from the ovary to the uterus and is the usual site of fertilization.
  • S (Ovary): Produces female gametes (eggs/ova) and female hormones (estrogen and progesterone).

28. Three challenges girls face during the adolescence stage are:

  • Menstruation and managing menstrual hygiene.
  • Body image issues due to physical changes like breast development and weight gain.
  • Peer pressure and emotional changes, which can affect self-esteem and decision-making.

29. a) Two functions of the excretory organ (skin) that the learners modelled are:

  • Excretion of waste products like urea and salts through sweat.
  • Regulation of body temperature through the evaporation of sweat.

Part b

4 g/cm34 \text{ g/cm}^3

Identify the part marked D

  • D: Hair

30. Calculate the density of the stone.

  1. Identify the given values.

    Mass (mm) = 200 g200 \text{ g}
    Volume (VV) = 50 cm350 \text{ cm}^3

  2. Use the formula for density, which is mass divided by volume.

    ρ=mV\rho = \frac{m}{V}

  3. Substitute the given values into the formula and calculate.

    ρ=200 g50 cm3\rho = \frac{200 \text{ g}}{50 \text{ cm}^3} ρ=4 g/cm3\rho = 4 \text{ g/cm}^3

    The density of the stone is 4 g/cm3\boxed{4 \text{ g/cm}^3}.

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