How many elements are there?
A - None of these answers
B - 200
C - 118
D - 133
E - 121
Answer: C - 118
Most occur naturally on Earth but some are created in a laboratory using nuclear processes
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Basics Of Chemistry
- Why is it beneficial to use a logarithmic scale to measure pH?
- Which of the following is a strong acid?
- The pH scale is a way of measuring _______.
- The pH scale is a _______ scale.
- Which of the following is a strong base?
- Which of the following is an example of diffusion?
- Which of the following is NOT true?
- What would you expect to happen to a piece of celery you put into a hyper-tonic solution?
- Which of the following is responsible for swelling our hands after exercising?
- What do you think would happen if you added a sugar crystal to a supersaturated solution of sugar in water?
- Which of the following solutes would NOT form a solution if added to water?
- Which of the following is NOT a hydrophobic substance?
- We call a substance that is being dissolved into another substance a
- When a substance dissolves another substance, it is the ______________.
- When one substance is dissolved in another substance, a _____ is formed.
- Why is solid water (ice) less dense than liquid water?
- Which of the following statements accurately describe ice: I. Ice is denser than water. II. Hydrogen bonds hold ice molecules closer together than they do liquid water molecules. III. Ice has a crystalline structure.
- Which of the following concepts help explain why water can travel up a narrow tube? I. Cohesion II. Adhesion III. Specific gravity
- Water's ability to move against gravity in a narrow space, such as a tube, is called
- Which of the following properties explain why a city near the Pacific Ocean experiences less dramatic changes in temperature during the day compared to a city farther inland? I. Water forms hydrogen bonds II. Water has a low specific heat III. Water has a high surface tension
- What is an electron shell?
- Which of the following statements is true?
- If Argon is a noble gas and its atomic number is 18, how many electrons can be found in the valence level?
- Given the following information, which element(s) are most likely to lose electrons? I. Iodine is a member of Group VII II. Strontium is located in the second column of the periodic table III. Selenium has six valence electrons
- What is the maximum number of electrons that can occupy the 2s orbital?