Why is denting a bike fender not a chemical change?, The bike looks different, The metal does not change into another substance it only changed its shape, The metal does not change its shape it changed into another substance, The bike fell apart, How can we tell if a chemical change has taken place?, You can’t tell, A new substance is formed that is the same as the old substance, A new substance is formed that is different from the original substance, It only changes shape, Why is it smart to clean and dry your metal bikes?, So the bikes do NOT rust, So the bikes would be ready to ride again, no one likes dirty bikes, What could happen to a bike as a result of someone not cleaning all the water off of his bike?, Nothing he still has his bike, He dented the fender, His bike was stolen, His bike began to rust, Which of these examples is a physical change?, A bike rusting, Folding paper into a paper airplane, Baking a cake, Oxygen and water reacting with metal to form rust, When a piece of paper burns and turns into ash and smoke, what happens to the tiny particles that make up the paper?, They completely disappear and are gone forever., They rearrange and bond together to form completely new substances, like ash and gas., They stay the exact same size and shape, just get hotter., They turn into liquid water particles., In a science experiment, Mia mixes baking soda and vinegar together in a bottle, and bubbles of gas start to form. What word do we use for the baking soda and vinegar that Mia mixed together at the very beginning of the experiment?, Reactants, Products, Catalysts, Mixtures, Liam weighs a sealed plastic bag containing an Alka-Seltzer tablet and some water before mixing them. After the tablet fizzes and dissolves completely inside the sealed bag, he weighs the bag again. What will happen to the total mass of the bag and its contents?, The mass will decrease because the tablet is now dissolved and gone., The mass will increase because the bubbles make the bag heavier., The mass will stay exactly the same because no particles escaped the sealed bag., The mass will drop to zero once the fizzing stops., Maya leaves her brand-new iron bicycle outside in the rain. A few weeks later, she notices a reddish-brown, flaky coating forming on the metal. What is this reddish-brown substance (rust), and what does it tell us?, It is just wet paint that changed color., It is iron that melted into a liquid., It is a physical change where the iron just got dirty., It is a new substance called iron oxide, proving a chemical change occurred., Which of the following is the best piece of evidence that a chemical change (not just a physical change) is happening?, Ice cream melting on a warm sidewalk., An effervescent tablet dropped in water suddenly bubbling up and releasing a new gas., Cutting a large sheet of construction paper into tiny squares., Folding a piece of metal foil into a tiny boat., When wood burns in a campfire, it turns into ash, smoke, and gases. What happens to the tiny particles that made up the original piece of wood?, They vanish completely into thin air and no longer exist., They break apart and rearrange to form brand-new substances like ash and gas., They stay together as wood particles, just get smaller and invisible., They turn into liquid water and soak into the ground., ____________ are the starting substances that interact at the beginning of a chemical change., Products, Catalysts, Mixtures, Reactants, ____________ are the new substances formed as a result of the chemical reaction., Products, Catalysts, Mixtures, Reactants, A ______________ helps speed up a reaction, but vinegar and baking soda are the starting ingredients being consumed., Products, Catalysts, Mixtures, Reactants, Dissolving or reacting does not destroy matter; the mass is conserved., true, false, Rust is a brand-new material with different properties formed by a ________ reaction between iron, water, and oxygen., chemical change, physical change, Which of the following observations is the best evidence that a chemical change has occurred?, Ice cream melting into a warm, sticky liquid on a hot sidewalk., Mixing two clear liquids together and suddenly seeing bubbles and a bright yellow color appear., Tearing a large sheet of construction paper into many tiny pieces., Folding a flat piece of aluminum foil into a tiny square.

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