A chemical called polypropylene is used in most common plastic products, such as bottles, containers, furniture, automobile parts, and toys. Shown below are some eating utensils made of polypropylene.
The method used to make polypropylene involves extracting crude oil from the Earth and heating it. This process results in different types of organic chemicals, some of which are combined to make polypropylene. Polypropylene can then be molded into different shapes to create a wide range of products.
Which of the following best describes the process that converts crude oil into polypropylene?
A.
A synthetic resource undergoes a chemical process to form a natural material.
B.
A natural resource undergoes a chemical process to form a synthetic material.
C.
A synthetic resource undergoes a physical process to form a natural material.
D.
A natural resource undergoes a physical process to form a synthetic material.
5 answers
B. A natural resource undergoes a chemical process to form a synthetic material.
Coal is a nonrenewable resource that is mined from the ground. Coal has been used by humans as a major source of energy production since the Industrial Revolution in the 1800s. Which of the following must be true about the Earth's supply of coal?
A.
The supply of coal has decreased since the 1800s.
B.
The supply of coal has not changed since the 1800s.
C.
The supply of coal has increased since the 1800s.
D.
The supply of coal is constantly being renewed.
A.
The supply of coal has decreased since the 1800s.
B.
The supply of coal has not changed since the 1800s.
C.
The supply of coal has increased since the 1800s.
D.
The supply of coal is constantly being renewed.
A. The supply of coal has decreased since the 1800s.
Kevin's science class performed an experiment using baking soda, vinegar, a red balloon, and a flask. First, they filled the flask with vinegar and added baking soda into the deflated balloon. Then, they placed the balloon over the mouth of the flask carefully, without letting the baking soda fall into the vinegar. They observed that the balloon was still deflated.
Next, the students held the balloon up and allowed the baking soda to fall into the flask and mix with the vinegar. The mixture began to bubble, and the balloon began to inflate.
Which of the following best describes what happened when the vinegar and baking soda were mixed?
A.
A physical change occurred, and the baking soda turned into a gas.
B.
A chemical reaction occurred, and a new substance was formed.
C.
A chemical reaction occurred, but no new substances were formed.
D.
A physical change occurred, and the vinegar turned into a gas.
Next, the students held the balloon up and allowed the baking soda to fall into the flask and mix with the vinegar. The mixture began to bubble, and the balloon began to inflate.
Which of the following best describes what happened when the vinegar and baking soda were mixed?
A.
A physical change occurred, and the baking soda turned into a gas.
B.
A chemical reaction occurred, and a new substance was formed.
C.
A chemical reaction occurred, but no new substances were formed.
D.
A physical change occurred, and the vinegar turned into a gas.
B. A chemical reaction occurred, and a new substance was formed.
1 answer