If an elements atomic mass is 70 and it has 39 neutrons how many protons does it have?

What does it mean when science is a black box?

What determines how hard an atom attracts electrons in a covalent bond?

What is the correct balanced equation for the following: potassium iodide + lead (II) sulfide - -> lead (ii) iodide + potassium sulfide (A) 2KI + PbS - > Pbl2, + K2S (B) KI + PbS-> Pbl + KS (C) KI + Pb25 - > Pb2l + KS (D) 2KI + Pb25 - > Pb2l2 + K2s

How can the match remain unlit in the middle of the flame of a brusen burner

A dead alkaline battery is found to contain a compound of manganese and oxygen. Its percentage composition is 70.0% Mn and 30.0% O. What is the empirical formula of this substance?

How much concentrated 5.24M sulfuric acid is need to prepare 4.4 mL of a 5.29M solution

What is the percent yield if the actual yield from this reaction is 343 g?

What is the best safety practice recommended before leaving the chemistry laboratory?

Which of the following numbers is correctly rounded to three significant figures, as shown in brackets? a. 12,556 [12,500] b. 4.5671 * 10^-9 [4.567 * 10^-9] c. 3.00072 [3.001] d. 0.006739 [0.00674] e. 5.4589 * 10^5 [5.459 * 10^5]

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct? They both have seven protons in the nucleus. They both have the same mass number. They both have seven neutrons in the nucleus.