How many seconds are there in 2500 years? (Assume 1 year = 365 days.)

Express your answer using three significant figures.

Which molecular formula corresponds to this model of a chemical compound? (black = carbon; red = oxygen; white = hydrogen)

What does it mean to have a control group

Identify the representative elements from the list given below na ca sc co ni si n se cl ge

As element of group 1 on the periodic table are considered in order of increasing atomic radius, the ionization energy of each successive element generally, A. Decreases B. Remains the same C. Increases

A solid element that is malleable, a good conductor of electricity, and reacts with oxygen is classified as a (1) metal (2) metalloid (3) noble gas (4) nonmetal

How do the different spheres of Earth interact? Volcanic eruptions are natural phenomena in the. They sometimes erupt, spilling out lava and dust. The lava solidifies, forming new landmasses.

Differentiate between mass, volume, and density. Explain why only changing the shape of an object would have no effect on its density.

Describe the properties of noble gases. Based on their electronic arrangement, explain whether they can exist alone in nature.

In the reaction 2k + 2h2o → 2koh + h2, which compound has an element ratio of 2 : 1? h2o h2 k koh

Describe with sketches how electrons are transferred during ionic bonding for: (a) Lithium Bromide (LiBr) (b) Potassium Bromide (KBr) (c) Lithium Chloride (LICI)