Science 9 ­ Unit B ­ PAT practice Use the following information to answer the next question Use the following information to answer the next question Isabel watched her grandma crack eggs into a frying pan. She noticed that the transparent liquid surrounding the yolks of the eggs became solid and white when the pan was placed over the burner of the stove. Juan rubbed an iron nail with a strong magnet. After placing the magnetized nail on a wet tabletop, he observed reddish­brown spots appearing on the nail. 4. The changes Juan observed in magnetizing and then placing the magnet on wet surface are examples of a a. Chemical change and a chemical change respectively b. physical change and a chemical change respectively c. Chemical change and a physical change respectively d. Physical change and a physical change respectively 1. Which of the following statements ​
best​
describes the changes that occur to the egg during frying? a. The changes are physical because a change in state occurs and an odour is detected. b. The changes are chemical because heat is absorbed and a new substance is formed. c. The changes are chemical because an odour is detected and heat is released. d. The changes are physical because a new colour appears and heat is absorbed. Use the following information to answer the next question Use the following information to answer the next question Iron + water + oxygen → rust 5. The given chemical reaction is an example of a. Corrosion b. Combustion c. Neutralization d. Decomposition A difference between a compound and a mixture is that a compound ​
____​
i​
_____​
and a mixture ____​
ii​
____. 2. This statement is completed by the information in which of the following rows? Row i A. Is made of elements Use the following information to answer the next question ii Is not made of elements B. Has properties that Does not have are always the properties that are same always the same C. Can dissolve Cannot dissolve D. Is colourless Is visible W Y Z 3. Coal can be burned in power plants to produce electricity. The burning of coal is a. An endothermic reaction b. A neutralization reaction c. An exothermic reaction d. A corrosion reaction 6. Which of the given containers should be kept away from an open flame? a. W b. X c. Y d. Z X Use the following information to answer the next question A scientist found the mass of two samples of chemical compounds. The scientist placed the two compounds into a beaker and observed the resulting chemical reaction. The scientist then found the mass of the product in the beaker. The final mass was less than the mass of the two original samples. 7. The ​
most likely​
explanation for the difference in mass is that a. One product of the reaction was a gas that escaped into the air b. Part of the original mass was converted to heat c. The scientist made an error in measurement d. The product was hot, resulting in less mass Use the following information to answer the next question Glucose sugar, a product of plant photosynthesis, is chemically represented as C​
H​
O​
. Glucose has 6​
12​
6​
​
____​
i​
_____​
elements and a total of ​
____​
ii​
____ atoms​
. 8. This statement is completed by the information in which of the following rows? Row i ii A. 3 8 B. 6 12 C. 3 24 D. 6 18 9. Which of the following illustrations represents the molecular compound carbon disulfide? A. C. B. D. Use the following information to answer the next question The information box from the periodic table for the metal sodium is shown. + 1​
11 Na Sodium 23.0 10. How many neutrons does a sodium atom have? a. 11 b. 12 c. 23 d. 24 11. The placement of metal and non­metal elements in the periodic table makes it possible to predict the formation of compounds. Which of the following chemical formulas indicates the formation of an ionic compound? a. KI b. ICl c. SO​
3 d. CHCl​
3 12. Iron combines with oxygen to form rust, which is iron(III) oxide (Fe​
O​
). What are the charges of 2​
3​
the iron ion and the oxygen ion, respectively? 3+​ 2­ a. Fe​
, O​
2+​ 3­ b. Fe​, O​
+​ ­ c. Fe​
, O​
2+​ ­
d. Fe​, O​
Use the following information to answer the next question The voodoo lily, ​
Sauromatwn guttatunt​
, relies on flies for pollination. To attract flies, the flower emits an odour similar to that of rotting meat. Heat generated by special structures within the plant creates the pungent smell. Mitochondria within these structures produce heat during respiration. 13. In order for the voodoo lily to generate heat. its mitochondria would require a. oxygen and glucose b. light and carbon dioxide c. carbon dioxide and water d. chloroplasts and ribosomes ANSWERS 1)
2)
3)
4)
B B C B 5)
6)
7)
8)
A D A C 9) B 10)B 11)A 12)A 13)A