Which element is a metalloid?

a. argon (ar)

b. silicon (si)

c. potassium (k)

d. magnesium (mg)

The air in a hot-air balloon at 763 torr is heated from 14.0°C to 31.0°C. Assuming that the moles of air and the pressure remain constant, what is the density of the air at each temperature? (The average molar mass of air is 29.0 g/mol.)

Based on the kinetic theory, which statement is true? The particles of matter are stationary. Matter is composed of very small particles. Matter is made up of only charged particles. The particles of matter have zero kinetic energy.

How many molecules are in 3.5 g of sulfur dioxide

What is the mass percent of nitrogen in lead (ii) nitrate (pb (no3) 2) ?

13. What is the main purpose of a particle accelerator? It reproduces the reaction conditions found in nature. It slows down the reaction process. It magnetizes small particles. It speeds up small particles.

About how many elements are found on the periodic table? Question 8 options: 25 50 110 200

If JM = 5x - 6 and LM = 2x - 6, which expression represents JL?

5. The air rising cools as it reaches the top of which atmospheric layer? Troposphere Metrosphere Thermsphere none of the above

Looking at a net ionic equation how can i tell with reactant ions were oxidized

Why is it important to conserve both nonrenewable and renewable resources?