In a science experiment showing the splitting of water into Oxygen and hydrogen, two inverted test tubes of water were placed over the site of the reaction. (see the pic) How can you tell which one was catching the oxygen and which one was catching the hydrogen? Question 4 options: The hydrogen is a positive ion and will be located close to the negative terminal of the battery. The oxygen is a negative ion which will be located next to the negative terminal of the battery. There are 2 hydrogen atoms for every oxygen atom. The hydrogen will take up more space and is pushing the water lower in the test tube. The hydrogen, being a smaller atom, will take up less space than the oxygen. It will push the water down less. Question 5 (1 point) A student notices that when calcium chloride is placed in water, the test tube feels warm. What kind of reaction has taken place? Question 5 options: Combustion Reaction Endothermic Reaction Exothermic Reaction Endergonic Reaction Question 6 (1 point) A 200 kg golf cart strikes a 1500 kg car with 1000N of force, bringing its velocity from 5 m/s to 0 m/s in 1 second. How much force did the car apply to the golf cart? Question 6 options: 100 N 1000 N 1500 N Not enough information has been given to solve the problem Question 7 (1 point) In a “minute to win it” game, cards are placed between cups to stack them. (see the picture) The contestant then pulls the card out in hopes that they will end with a set of stacked cups. Why does this work? Question 7 options: There is no friction between the card and the cup. Inertia will keep the top cup from moving very far. Gravity will pull one cup on top of another. The opening of the cup is so much bigger than the bottom, even though the cup moves they will both be stacked together. Both cups are moved the same amount by the friction between them and the card. Question 8 (1 point) A student claims to have a weight is 45 kg. What is the problem with the claim? Question 8 options: Most people weigh more than 45 kg. Most people weigh less than 45 kg. Kg is a unit of mass in the SI system, so she has confused mass and weight. The student has confused kg and Newtons and must weigh 45 N. Question 9 (1 point) When the motion energy of an object changes, there is inevitably some other change in energy at the same time. If an object is slowing down, where is the energy going? (Check all that apply) Question 9 options: The potential energy could be increasing, like a ball thrown into the air. The kinetic energy could be lost to friction or air resistance. The ball could be returning to its natural resting state. Due to the conservation of energy, the kinetic energy must stay the same. Question 10 (1 point) What is true of both light and sound. Question 10 options: They are both transverse waves. They can both travel through the vacuum of space. Both can be modeled as waves having amplitude, frequency and wave lengths. They both move at the same speed. Question 11 (1 point) Saved What is true of both gravity and magnetism? Question 11 options: Both are dependent on mass. Both forces can act without objects touching. Both forces are directly proportional to the distance between the objects. Neither is a fundamental force of nature.