Quick questions on Measurement and apparatus: N(A)-Level Chemistry experimental skills

Liquids are measured by volume, usually in cubic centimetres. Different apparatus gives different accuracy:

Mass is measured with an electronic balance in grams. To find the mass of a solid such as a powder, you weigh a container first, add the solid, weigh again, and subtract. This is called weighing by difference and it avoids losing any of the solid stuck to the container.

When you read any scale with a liquid, the surface curves into a shape called the meniscus. For water and most liquids the meniscus curves down, so you read the bottom of the meniscus. Keep your eye level with the mark and look straight across. If you look from above or below, you get a wrong reading called a parallax error.

A student needs to add exactly $10.0\ \text{cm}^3$ of acid to a flask. State the most suitable apparatus. [1 mark]

Explain why an electronic balance is used to measure the mass of a powder rather than judging it by eye. [2 marks]

A liquid level in a measuring cylinder appears to be at $30\ \text{cm}^3$ when viewed from above. State what kind of error this is and how to avoid it. [2 marks]