New evidence can lead to a change in scientific knowlodge

true or false

Which of the following Period 4 elements has the most metallic characteristics? A) Ca B) Ge C) As D) Br

The flame from my candle gives off black smoke heat and light what type of changes do these indicate

Phenolphthalein is pink in an aqueous solution having a ph of (1) 5 (2) 2 (3) 7 (4) 12

One isotope of carbon (C) has exactly the same mass number and atomic mass since it was used as the definition of the atomic mass unit (amu). Which isotope is it and what is its atomic mass?

What is the mass number of 207Pb? A: 289 B: 207 C: 125 D: 82

Which description is not a property of an acid? A turns litmus paper red B bitter taste C corrosive D dissolve metals

Concerning the 10.0 mL of 0.50 M NaCl diluted to 100 mL of solution: When a solution is diluted, does the dilution change the number of grams dissolved? yes no

What causes element name to change

Charles's law states that

If 30mL of 0.5M KOH is needed to neutralize 2M HCl, what was the volume of the acid?