2 nd 6 wks 3 Week Review PowerPoint by: Katherine Pease Questions by: Rebecca Neill

1. Steel wool in Jar A rusts and the steel wool in Jar B does not rust. What is the manipulated variable that best explains the difference?

Answer: Exposed to air and water, one is notExposed to air and water, one is not Manipulated Variable is the lidManipulated Variable is the lid

2. What evidence supports that a chemical change takes place when rusting occurs?

answer Color changeColor change Change in chemical makeupChange in chemical makeup

3. What type of property is the density of a liquid? Physical or Chemical

Answer: Physical

4. While conducting an investigation using chemicals, what should be avoided when observing odor?

Answer: Taking a big whiff of substance should be wafted towards scientistTaking a big whiff of substance should be wafted towards scientist

5. A student conducts an investigation to the chemical reaction of an Alka- Seltzer tablet in water. What evidence supports this type of reaction? feeds.gawker.com

Answer: Bubbles Formed

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.

Answer: Rot Decompose

8. Give an example of a physical property using a shoe as the substance.

Answer: Color Size Density Texture

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?

Answer: Bubbles Odor

10. Which of the three types of elements would have the characteristics of being shiny, ductile, and conducting heat well?

Answer: Metals

11. What type of change can be observed in the ice cubes?

Answer: Physical

12. Physical changes occurring during the water cycle. What is the process when water changes in state from a gas to a liquid?

Answer: Condensation

13. The displacement method was used to measure the volume of a rock. What is the volume of the rock? See Handout for diagram

Answer: 25ml

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

Compound Cl2 O3 Molecule

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