Author Question: In the first melting point trial, a solid begins to melt at 55 C and is a clear liquid at 65 C. In ... (Read 20 times)

jlmhmf

  • Hero Member
  • *****
  • Posts: 552
In the first melting point trial, a solid begins to melt at 55 C and is a clear liquid at 65 C. In
   the second trial, the solid begins to melt at 59.0 C and liquefies completely at 60.5 C.
 
  What is
   the precise melting point of the compound?
  A) 55 C
  B) 59.0 C
  C) 60.5 C
  D) 5565 C
  E) 59.060.5C

Question 2

Balance the chemical equation given below, and determine the number of milliliters of 0.00300 M phosphoric acid required to neutralize 45.00 mL of 0.00150 M calcium hydroxide.
 
  ______ Ca(OH)2(aq) + ______ H3PO4(aq)  ______ Ca3(PO4)2(aq) + ______ H2O(l) A) 3.04 mL
  B) 15.0 mL
  C) 22.5 mL
  D) 33.8 mL

Question 3

How many moles are there in 120 g of glucose (C6H12O6)?
 
  A. 0.5 moles
   B. 0.67 moles
   C. 1.0 moles
   D. 1.2 moles



emsimon14

  • Sr. Member
  • ****
  • Posts: 344
Answer to Question 1

E)

Answer to Question 2

B

Answer to Question 3

B



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

Everyone has one nostril that is larger than the other.

For a complete list of videos, visit our video library