The equation for the chemical reaction shown below is not balanced. What number should replace the question mark to balance this equation? 2Al + ? Cl2 → 2AlCl3 A. the number 2 B. the number 3 C. the number 4 D. the number 5

In most lewis dot structures of neutral compounds, carbon as the central atom will be bound to a maximum of how many atoms, nitrogen will be bound to a maximum of how many atoms, and oxygen will be bound to a maximum of how many atoms?

Some instant cold packs contain ammonium nitrate and a separate pouch of water. When the pack is activated by squeezing to break the water pouch, the ammonium nitrate dissolves in water and the pack gets cold.

A solution of 49.5% H₂SO₄ by mass has a density of 1.39 g/cm³ at 293 K. A 26.0 cm³ sample of this solution is mixed with enough water to increase the volume of the solution to 99.3 cm³. Find the molarity of sulfuric acid in this solution.

What is true about the metals in group 1A, 2A, 3A? a) all form ions with negative charges b) all have ions with a 1 + charge c) gain electrons when they form ions d) lose electrons when they form ions

What does the kinetic theory explain? Question 4 options: Heat is due to Pascal's principle. Heat is due to temperature. Heat is due to the motion of molecules. Heat is due to potential energy.

Which two bases pair with each other?

What is the main cause of increased erosion

Where should you keep your glass of soda if you want it to remain fizzy

Why do the atoms in a piece of copper metal have no net charge? -The charges of the positive and negative copper ions cancel each other out. -The number of electrons surrounding each copper nucleus doesn't change.

In a closed system, the total heat given off by warmer substances equals the total heat energy gained by cooler substances (qwater = - qliquid).