PHYSICAL SCIENCE - 2ND SEM - MIDTERM

He stated that there is a relationship between electricity and matter.

According to Anaximenes, what was the primary element from which all things were composed?

A group of students in a biology class is learning about the formation of elements in the universe. The teacher explains a phenomenon that is responsible for the creation of elements like carbon, which is essential for life as we know it. What term describes this phenomenon?

• Supernova Explosions

• Stellar Nucleosynthesis

• Nuclear Fusion

• Big Bang Nucleosynthesis

All of the following are true about Democritus' atomic theory EXCEPT ______.

• Everything is made up of atomos and the void.

• Atoms vary in size and shape.

• Atoms are composed of subatomic particles.

• Atoms are infinite in number.

Refers to the philosophy that matter is made out of atom.

4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?

• 42.00 amu

• 42.19 amu

• 10.43 amu

• 40.04 amu

What quantities vary between isotopes of an element?

• protons, electrons, and atomic mass

• protons, electrons, and atomic number

• neutrons and electrons

• neutrons and atomic mass

Which of the following statements cannot be explained by Dalton's ideas?

• The atoms of carbon and nitrogen have different properties

• The nucleus is consisting of proton and neutron.

• Water H2O and hydrogen peroxide (H2O2) are two different elements.

• Magnesium burns in the presence of oxygen, producing magnesium oxide (MgO).

What is the hyphen notation for the isotope that has 39 protons and 50 neutrons?

• Yttrium-11

• Tin-39

• Tin-89

• Yttrium-89

Which isotope atom has 4 neutrons?

• Li-6

• Li-7

• Li-8

• all of the above