What is the term that is used to describe a key factor required to start a fission reaction?

What element has the same valence electrons as carbon A) N B) AI C) Si or D) Be

Sand dunes and sand waves are both deposited in the same environment. True/False

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

Which phrase describes a solution? A. a homogeneous mixture B. a graduated substance C. a heterogeneous mixture D. a primary mixture of elements

A certain ore is 26.9% nickel by mass. How many kilograms of this ore would you need to dig up to have 50.0 g of nickel?

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.