Chemistry
a piece of unglazed porcelain used to test a minerals streak
Aluminum metal reacts with HCl to produce aluminum chloride and hydrogen gas. How many grams of aluminum metal must be added to an excess of HCl to produce 33.6 L of hydrogen gas, if the gas is at STP?(A) 18.0 g(B) 35.0 g(C) 27.0 g(D) 4.50 g(E) 9.00 g
What percentage of the total mass of KHCO is made up by nonmetallic elements?a. 17%b. 83%c. 61%d. 20%e. 50%
Which term is used for the tendency of an object to resist a change in its motion? A. accelerationB. displacementC. momentumD. inertia
Which of the following can be achieved by using a visible-light spectrophotometer?I. Detecting the presence of isolated double bonds.II. Finding the concentration of a KMnO solution.III. Running a flame test to determine if Na+ or K+ is in a solution.(A ) III only(B ) II only(C) I only(D) II and III(E ) I and II
Element X is found in two forms: 90.0% is an isotope that has a mass of 20.0, and 10.0% is an isotope that has a mass of 22.0. What is the atomic mass of element X?A. 20.0B. 20.2C. 20.8D. 21.2E. 21.8Can anyone explain this one for me?
What is the weight of a toy car that has a mass of 0.28 kg?
What does a red shift indicate about a galaxy? A. It is moving toward Earth.B. It is moving very fast.C. It is slowing down.D. It is moving away from Earth.
How many times more basic is a solution with a pH of 10 than a solution with a pH of 8a. A pH of 10 is two times as basicb. A pH of 8 is two times as basicc. A pH of 10 is 2,000 times as basicd. A pH of 8 is 20 times as basice. A pH of 10 is 100 times as basic