8th UIL Science II District 14-15

Applying a larger force to an object without increasing its mass will cause an increase in the object's

• gravity
• inertia
• acceleration
• weight

Which subatomic particle is most involved in chemical bonding?

• proton
• electron
• neutron
• nucleus

Which set of lab equipment will provide the most precise measurements for calculating density of an irregularly shaped block?

• flask and beaker
• balance and flask
• graduated cylinder and balance
• flask and graduated cylinder

Scientists observed the relationships between element characteristics and atomic mass in the early history of the periodic table.  Some scientists used this information to predict the existence of unknown elements.  How did modern scientists best apply this information?

• Scientists were able to change the atomic structure of the elements
• Scientists were able to make new elements with unpredictable physical and chemical properties.
• Scientists were able to create isotopes of various elements
• Scientists were able to predict the properties of new elements based on trends.

What is the correct formula for dinitrogen pentoxide?

• NO
• N₅O₂
• N₂O₅
• N₇O₇

Which process represents a chemical change?

• oxidation
• sublimation
• evaporation
• condensation

A chemical equation is shown below.
___Al+___O₂ → ____ Al₂O_{3
What is the molar ratio for the balanced chemical equation?}

• 1:2:5
• 2:1:1
• 4:3:1:
• 4:3:2

Which of the following will NOT change the acceleration of an object?

• applying a force equal to or greater than the force of friction
• a car that is slowing to a complete stop
• applying a force less than or equal to the force of friction
• a car using cruise control driving on a straight highway

Which of the following situations best represents Newton's Second Law of Motion?

• seat belts used to provide a safety for passengers whose motion is governed by Newton's laws
• A brick is broken over an individual's hand by hitting it sharply with a hammer during a science demonstration.
• A heavier skydiver will accelerate to a higher velocity before reaching terminal velocity,
• A rocket is propelled into space as the engines provide a downward force that is equal to the force that the ground applies to the rocket.

a full moon is observed on the 15th of a given month.  About how long will it take before a person on Earth is able to view a new moon?

• 1 day
• 7 days
• 14 days
• 28 days