6. A student conducts an investigation using a Ziploc bag and some chemicals. Two scoops of calcium carbonate, one scoop of baking soda, and 10ml of water are combined in the Ziploc bag. After 30 seconds, the student observe is the bag increasing in size and feels an increase in temperature.
6. What two pieces of evidence supports a chemical change has taken place? sacramento.metblogs.com
Answer: Increase in size Increase in temperature
7. Give an example of a chemical change using an apple as the substance. www.flickr.com
9. A student combines 3 grams of baking soda with 20ml of vinegar in a 100ml beaker. The student observes bubbles rising to the surface and bursting. What evidence supports a chemical change has taken place?What evidence supports a chemical change has taken place? www.flickr.com
Scientists use a graduated cylinder to measure the volume of something. Remember volume is the amount of space an object takes up. Because the liquid is curved, to read the volume correctly you must look at the meniscus (the bottom of the curve). What is the volume of liquid in each container?
Use a graduated cylinder to measure the volume of an irregular shaped solid Read the beginning volume Drop the object in on an angle. Subtract the beginning volume from the new water level. What is the volume of the object?
To find the Volume of Solid: Use the formula Length x Width X Height It doesn't matter what you consider your length, width, or height as long as you DON’T MEASURE THE SAME SIDE TWICE
Metals on the Periodic Table of Elements might have this property. What is it? HOT WATER COLD WATER
Element Molecule Compound SaltElement Molecule Compound Salt
Name properties of the elements highlighted in yellow Name some properties of most of the elements highlighted in blue Name properties of most of the elements highlighted in orange Name properties of most of the elements highlighted in pink
Element Molecule Compound Mixtures Solution symbol(s) Match the words to the correct symbol(s) which would represent a correct model of them
Common compounds and their formulas Hydrochloric acid HCl Salt NaCl Water H2O Sugar C12H22O11 Carbon dioxide CO2 What are the elements in each? How many total atoms are in each? How many elements are in each?
Boiling point Radioactive Density Non-reactive 100 o C
Look at the chemical reactions. What do they tell you about the chemical properties of a compound? OXYGENOXYGEN Na + Cl NaCl Silver reactive metal poisonous green gas nutrient we need to live (salt) C + O CO 2 Black brittle solid clear odorless gas dense gas we expel as waste