WGU D425 Objective Assessment (Latest 2026/ 2027 Update) Introduction to Chemistry Review| 100% Verified Questions & Answers | Grade A

WGU D425 Objective Assessment (Latest 2026/ 2027 Update) Introduction to Chemistry Review| 100% Verified Questions & Answers | Grade A QUESTION According to Dalton's atomic theory, what happens to atoms in a chemical reaction? Answer: They are combined, they are separated and they are rearranged QUESTION How are the groups in the periodic table organized? Answer: In vertical columns based on the organization of the outer shell electrons QUESTION Which sequence lists the arrangement of electrons within an atom from largest to smallest? Answer: Shell, subshell, orbitals, electrons QUESTION How many electrons, protons and neutrons are in Calcium-40? Answer: 20 protons, 20 electrons, 20 neutrons QUESTION Which of the three subatomic particles contributes least to the mass of the atom? Answer: Electron QUESTION Which statement represents an important step in dimensional analysis? Answer: Use ratios and conversion factors to cancel out units QUESTION How many cm are in 1.24 m? Answer: 124 cm QUESTION How many milliliters are in 34 meters? Answer: 34000 mm QUESTION How are the following classified: Co, CO, and O2? Answer: Co is an element, CO is a compound, and O2 is a molecule. QUESTION A substance has an indefinite shape and volume. The individual particles of this substance are not in contact and are in random positions. What is the physical state of matter of the substance? Answer: gas QUESTION Omar chops huge logs of firewood into smaller sizes that can fit his firepit. Which change is the chopping of wood an example of? Answer: Physical change QUESTION talia prepares a bowl of cereal with milk. when she starts to eat the cereal, she immediately spits it out because the milk has turned sour. which property change is the souring of milk an example of Answer: Chemical change QUESTION What is the mass number of an atom containing 17 protons, 18 electrons and 20 neutrons? Answer: 37 QUESTION What does a neutral atom with an atomic number greater than 2 consist of? Answer: Protons, neutrons and electrons QUESTION What is the relationship between electronegativity and atomic number for halogens? (Group 17) Answer: Atomic number and electronegativity are inversely related QUESTION What is the relationship between the atomic radius and atomic number for period 6 elements? Answer: The atomic radius decreases as the atomic number increases within the period. QUESTION What is the ratio of zinc to chloride ions in the compound zinc chloride? Answer: 1:2 QUESTION Which metal is capable of forming more than one cation? Answer: Sn QUESTION What is the correct name for CaH2? Answer: calcium hydride QUESTION Which compounds would you expect to be ionic?