Lab: Motion — Cumulative exam Answers

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration?

Which will decrease the rate of a reaction?

Consider the chemical reaction in equilibrium. H2 + I2 + heat 2HI What will happen to the chemical equilibrium if the temperature of the system is increased?

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.

Two football players are running toward each other. One football player has a mass of 105 kg and is running at 8.6 m/s. The other player has a mass of 90 kg and is running at -9.0 m/s.

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?

A researcher is using a particle accelerator in an experiment studying isotopes. How can the researcher change one isotope into a different isotope of the same element?

Consider the following system at equilibrium. CaCO3(s) Ca2+(aq) + CO32–(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect?

Question text not available

When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride than what is required to form the bonds of the new substance.

Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized elements?

Which most likely indicates a chemical change has occurred?

Which is an example of negative acceleration?

A car has a mass of 1,200 kg. What is its acceleration when the engine exerts a force of 600 N? (Formula: F=ma)

The graph indicates Linda’s walk.

A sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°C. If the system is at dynamic equilibrium, which of these statements is true?

In an investigation, the atoms of a certain substance lose energy during a change of state. Before the change, the atoms are far apart and move constantly at high speeds and in all directions. After the change, the atoms are close together but are able to slide past one another.Use the diagram that shows changes of state between solid, liquid, and gas to answer the question.

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

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?

Carlos is making phosphorus trichloride using the equation below. 2P +3Cl2 _PCl3What coefficient of PCl3 would show that the law of the conservation of mass is represented in the chemical equation?