What are the indications/signs that a chemical change has occurred?

How many calcium ions are in 0.3 mol of cacl2?

Consider the reaction of zn metal with hydrochloric acid: zn (s) + 2hcl (aq) → zncl2 (aq) + h2 (g) if 2.57 g of zn is reacted with 0.500 moles of hcl in a 3.00 l container what pressure does the generated h2 exert against the container walls at 35.

What is meant the term hydrocabron

The atomic radius of lithium is larger than the atomic radius of nitrogen. a. True b. False

There are 50 fish in the pond that have tags. You catch 25 fish, and 5 of them have tags. What is the best estimate of the number of fish in the pond?

Which of the following statements about transition metals is true? a. They are never found uncombined in nature. b. They include familiar metals such as gold, silver, copper, and nickel. c.

Elements can be separated from one another. Question 6 options: True False

One gram of lipid yields about 9kcal of energy. that is due to the high abundance of which chemical element?

Which of the following happens during a chemical change? Check all of the boxes that apply 0 One atom or more changes into atoms of another element. New substances with different properties are formed. O Solids, liquids, or gases may form.

The energy derived from the movement of H + ions down an electrochemical gradient from the intermembrane space into the matrix is used to drive the synthesis of ATP. How many H + ions must be moved into the matrix for the synthesis of 1 ATP?