8th UIL Science II invitational 14-15

What is true about the overall charge on an atom?

• there is an excess of electrons
• there is an excess of protons
• the protons and electrons are in equilibrium
• the protons and neutrons are constant

Looking at the atom pictured, what needs to occur for the valence shell to bed stable?

• lose four electrons
• gain three electrons
• lose three electrons
• gain four electrons

In a group on the periodic table, as you go down the elements listed, what happens to the size of the atom?

• increases
• decreases
• remains constant

How many atoms are shown in the molecule of ethylene glycol?

• 3
• 6
• 10
• 12

Which of the situations does NOT illustrate a chemical reaction occurring?

• mowing the grass
• metal left outside and it rusts
• formation of a flammable gas when combining HCl and Mg
• melting ice cream

Correctly balance the given chemical equation
__ Na₂CO₃+__HCl→__ NaCl+__CO₂₊ __H20

• 2,1,1,2,2
• 1,2,2,1,1
• 2,1,4,3,1
• 1,3,3,1,1

A barnacle living on a whale is considered what type of relationship?

• producer and consumer
• predator and prey
• parasitic
• symbiotic relationship

Which of following represents a velocity quantity?

• a car moving at 75 mph
• a hurricane moving northeast at 90 mph
• a plane flying at 225 mph
• a ship sailing at 35 knots

When an unsecured ball flies forward during a car crash, which of Newton's Laws best applies to this situation?

• Law of Inertia
• Law of force and acceleration
• Action-Reaction Law
• Law of gravitation

Since the tilt of Earth's axis is 23.5 degrees, the North Pole never directly points at the sun.  When will the North Pole be the closest to the sun?

• winter solstice
• spring equinox
• summer solstice
• fall equinox