Cumulative Exam — Cumulative exam Answers

Which statement correctly describes the electrons in a water molecule?

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?

What did Thomson’s model of the atom include that Dalton’s model did not have?

Which most likely indicates a chemical change has occurred?

Which statement correctly distinguishes photosynthesis and respiration?

The symbol P represents the element phosphorus. This element’s atomic number is 15. How many protons and electrons are in a P–3 ion?

Which statement correctly describes compounds?

Alai is comparing the physical property of two materials. He is hitting each with a hammer to observe what happens. What physical property of the materials is Alai most likely observing?

Which element is a halogen?

Which statement best explains how the mass of an atom is organized?

Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?

Natalia began to draw a diagram to compare bases and acids.

Sonya reads the element riddle below.I am shiny. I form +1 ions. There’s more!I am the most reactive metal in Period 4. Who am I?Which element is the answer to the riddle?

A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer at its bottom.

Which atoms and/or ions expand in all directions?

Which properties do metalloids share with metals?

View the table.

A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the same volume. What is the most likely difference between the two samples?

Which coefficient is needed in front of NaNO3 to balance the equation Na2S + Zn(NO3)2 → ZnS + _NaNO3?

Chris drew a diagram to compare the ways in which different organisms obtain nitrogen.