Which part of a helium atom is positively charged

According to Table N, which radioactive isotope is best for determiningthe actual age of Earth? (1) 238 U (3) 60 Co (2) 90 Sr (4) 14 C

Hydrogen gas and oxygen gas combine to form water. How many grams of oxygen are needed to react with 45.7 grams of hydrogen?

What is the proper solution to the following equation? Answer with correct significant figures. (23.1 + 5.61 + 1.008) * 7.6134 * 8.431 =

What is the volume of 1 mole of helium gas when the pressure is 1.47 atm and the temperature is 287k

Which of the following elements is a transition metal a. La b. Ca C. Cl d. Mn

Approximately how many moles of chlorine make up 1.79 * 1023 atoms of chlorine? A. 2.97 * 10-1 moles B. 2.97 moles C. 6.02 * 1023 moles D. 17.0 moles

Which substance is the most soluble at 28°C?

Predict the major product (s) formed when hexanoyl chloride is treated with excess etmgbr, followed by h2o.

Classify the properties based on whether they describe metals or nonmetals. They are good conductors of heat and electricity. They are brittle and break into sharp pieces. They are flexible and can be made into wires.

A gas occupies a 1.5 L container at 25 degrees Celsius and 2.0 atm. If the gas is transferred to a 3.0 L container at the same temperature, what will be its new pressure? a) 3.0 atm b) 2.0 atm c) 1.0 atm d) 4.0 atm