Nickel, a lustrous silver metal, has a melting point of 1,455 degree celcius. It is used to make the U.S 5 cent coin. Which statement accurately describes silver?

Which of the following statements best identifies the element in the model above?

An atom has an atomic number of 12 and a mass number of 24. How many protons neutrons and electrons are found in one neutral atom of magnesium?

Based on the periodic table, how many protons are found in an atom of Copper Cu?

Which 2 elements in the periodic table are in the same period?

The chemical formula for water is H₂O. How many oxygen atoms are in water?

A compound secreted by honeybees to paralyze intruders in thie hive s known as 2-hepatone. The formula fo the compound is shown below:

CH₃C₄H₈COCH₃

_{How many atoms of each element are in one molecule of 2-hepatone}

A silver ring reacts with compounds containing sulfur in the ai to form sulfur sulfide that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring students placed it in a pan lined with aluminum foil and added hot water & stirred. Students made observations of the process. Which observation provides evidence of a chemical reaction?

Which of the following is a true statement about chemical reactions?

A student used a video camera to record another student dropping a marble through water into a graduated cylinder. The students watched the video in slow motion & made observations shown in the image. During which part did the marble experience a balanced force?

The diagram below shows a boat moving north in a river at 3 m/s while current in the river moves south at 1 m/s. How will the boat be effected if it enters a part where the river where the current is moving south at 4 m/s?

Four students push carts filled with sports equipment across the gym. Each student pushes with the same amount of force. Which cart will have the LEAST change in speed?

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

During a lab investigation, students added four 50 g masses to two boxes and arranged the boxes so that they were motionless on a pulley, as shown the the diagram. The students then followed the procedures described in the box. The students recorded their observations after each procedure & reset the pulley system to the original conditions. During which procedures did the students observe an unbalanced upward force on Box 1?

A student jumps off a sled toward the west after it stops at the bottom of an icy hill. Based on the law of action- reaction, in what direction will the sled most likely move as the student jumps off

During a demonstration of Newton's laws of motion, a student used the setup shown in figure 1. The student flicked the index card with a fingertip and the coin fell straight down into a plastic cup as shown in figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?

The masses of 4 vehicles and net forces acting on them as they enter the highway are recorded in the table below. Which vehicle has the greatest acceleration as it enters the highway?

Two forces are applied to a 17 kg box, as shown. The box is on a smooth surface. Which statement best describes the acceleration of the box?