Science 10F Cluster 2 Atoms and Elements

Which of the following is an unsafe practice in the science lab?

• Using clean glassware for a lab
• Using a broken beaker during a lab
• Using chemicals from a container that is clearly labelled
• Holding a test tube away from your face when pouring chemicals

A student splashed some chemicals into his eyes. Which of the following describes the proper procedure that he should take next?

• Rub his eyes
• Stop, drop, and roll
• Dry his eyes with a paper towel
• Wash his eyes immediately with water for 15 mins.

Which of the following describes the proper way to smell a substance?

• Directly breathe in the fumes for at least 2 min.
• Stick your nose in the container and inhale the fumes.
• Hold the container at arm’s length and waft the fumes toward you.
• Hold the container directly under your nose and breathe in the fumes.

Which of the following describes matter?

• State of matter
• Anything with mass and volume
• Amount of matter in an object
• Amount of space that an object occupies

Which of the following describes what happens when heat is added to a substance?

• Particles lose kinetic energy and vibrate faster.
• Particles gain kinetic energy and vibrate faster.
• Particles gain kinetic energy and vibrate slower.
• Particles lose kinetic energy and vibrate slower.

Which of the following changes of state require the removal of heat? I – melting II – boiling

• I only
• II only
• Both I and II
• Neither I nor II

Which of the following is the temperature at which a solid change into liquid?

• Boiling point
• Melting point
• Both A and B
• Neither A nor B

Which of the following is the temperature at which a liquid changes into a gas?

• Boiling point
• Melting point
• Both A and B
• Neither A nor B

Which of the following was not part of Dalton’s atomic theory?

• All matter is made of small particles called atoms.
• Atoms can be created or destroyed.
• Atoms of the same element are identical.
• Atoms of one element are different from the atoms of other elements.

Which of the following was not part of Rutherford’s atomic theory?

• Most of the mass of the atom is concentrated in electrons.
• Most of the atom is empty space.
• The nucleus is the tiny, dense, central core of the atom.
• The nucleus contains protons and neutrons.