Q: Q: What branch of science is based on the modern atomic theory, which states that all matter is composed of atoms? Choices: - physics - psychology - biology - chemistry A:
A: chemistry

Q: Q: Superconductors expel a magnetic field from their interior. what is this phenomenon known as? Choices: - weissenberg effect - eibner effect - lauer effect - meissner effect A:
A: meissner effect

Q: Q: What occurs when an unstable nucleus emits a beta particle and energy? Choices: - nucleus decay - alpha decay - methane decay - beta decay A:
A: beta decay

Q: Q: Hybrid orbitals are formed only in which type of bonded atoms? Choices: - ionically - partially - thermally - covalently A:
A: covalently