Florida Statewide Science Assessment Sample Test

What is the atomic number of Carbon?

• 6

• 12

• 14

• 8

Answer explanation

The atomic number of an element is defined as the number of protons in its nucleus. Carbon has 6 protons, which gives it an atomic number of 6, making it the correct choice.

Tags

NGSS.MS-PS1-1

Which element has the symbol 'Na'?

• Sodium

• Nitrogen

• Neon

• Nickel

Answer explanation

The symbol 'Na' stands for Sodium, which is an alkali metal. The other options, Nitrogen, Neon, and Nickel, have different symbols: N, Ne, and Ni respectively.

What is the atomic mass of Oxygen?

• 15.999

• 12.011

• 18.998

• 20.180

Answer explanation

The atomic mass of Oxygen is approximately 15.999 atomic mass units. This value is derived from the weighted average of the isotopes of oxygen, making it the correct choice among the options provided.

Tags

NGSS.MS-PS1-1

Which element is in Group 18 and Period 1?

• Helium

• Neon

• Argon

• Krypton

Answer explanation

Helium is the only element in Group 18 and Period 1 of the periodic table. It is a noble gas, while Neon, Argon, and Krypton are in higher periods.

What is the symbol for Gold?

• Au

• Ag

• Ga

• Ge

Answer explanation

The symbol for Gold is 'Au', derived from the Latin word 'aurum'. The other options represent different elements: Ag for Silver, Ga for Gallium, and Ge for Germanium.

Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction. From his observation and research, he concludes that the substance goes through a chemical change when heated. How can Ethan best defend his conclusion?

• by demonstrating that the substance will eventually melt if the temperature continues to increase

• by verifying that the substance is now made up of different molecules than before it was heated

• by verifying that the substance is made up of only one type of element

• by demonstrating that the substance is less dense after it is heated

Answer explanation

Ethan can best defend his conclusion by verifying that the substance is now made up of different molecules than before it was heated, indicating a chemical change has occurred.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Mr. Roberts drives his car away from his house at a constant speed. Which of the following graphs best shows the relationship between the distance traveled and the time spent driving?

• Horizontal line

• Diagonal line upwards

• Vertical line

• Diagonal line downwards

Answer explanation

A diagonal line upwards indicates a constant speed, showing that as time increases, the distance traveled also increases. This reflects Mr. Roberts driving away from his house at a steady pace.

An object moves through space with balanced forces acting on it. Which statement best describes the speed and direction of the object as long as the forces acting on it remain balanced?

• The speed and direction of the object will both change.

• The speed and direction of the object will remain constant.

• The speed will change, but the direction will remain constant.

• The speed will remain constant, but the direction will change.

Answer explanation

When balanced forces act on an object, it remains in a state of equilibrium. This means that both the speed and direction of the object will remain constant, as there is no net force to change its motion.

Tags

NGSS.MS-PS2-2

A scientist performs an experiment and asks other scientists around the world to replicate it. Why would other scientists most likely try to perform the same experiment?

• to find out if weather of various regions of the world would affect the results

• to see if the experiment would be less expensive in another part of the world

• to confirm the results of the experiment conducted by the scientist

• to verify that the hypothesis of the experiment is a scientific law

Answer explanation

Other scientists would try to replicate the experiment primarily to confirm the results of the original study. Replication is a key aspect of the scientific method, ensuring that findings are reliable and not due to chance.

Based on the information in the graph, which of the following is the best prediction of how many grams of the compound will dissolve at 40°C?

• 40 g

• 65 g

• 85 g

• 100 g

Answer explanation

The graph indicates that at 40°C, the solubility of the compound is approximately 65 grams. This is the best prediction based on the data presented.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4