Using the periodic table is the elements how many valence electrons would helium have

Which of these statements describes a limitation of the Treaty on Plant Genetic Resources? A. It does not involve other countries. B. It does not allow the use of seed banks. C. It does not address threats to genetic diversity. D.

You need 70.2 J to raise the temperature of 34.0g of ammonia, NH3 (g), from 23.0C to 24.0C. Calculate the specific heat of ammonia.

What are the products in a chemical reaction? A) the substances that react in a chemical reaction. B) the substances that do not take part in a reaction. C) the substances that result from a chemical reaction.

What is the final volume of a gas that started at 20 L and 50 atm pressure when the pressure is decreased to 14 atm? Answer must be to nearest whole number.

Which has the higher entropy under the same conditions of t & p? a. 3 mol o b. 1 mol o3?

If two moles of aluminum chloride are dissolved in two liters of water, how does the vapor pressure of the water change?

What is the cornaviris?

How to find the moles of vinegar if you only know what the volume is

Be sure to answer all parts. A concentration cell consists of two Sn/Sn2 + half-cells. The electrolyte in compartment A is 0.23 M Sn (NO3) 2. The electrolyte in B is 0.87 M Sn (NO3) 2.

Explain why the radius of an atom cannot be measured directly. (6.3)