Which Idea was once accepted is now considered a scientifically inaccurate

A. tge nucleus is the center of the atom

b. an atom is solid material

c. electrons have a negative charge

d. electrons are arranged in layers

Describe the Coriolis effect.

How many atoms of gold (Au) are present in a sample of 2.5 mol Au? 1.5 * 10^24 atoms Au 1.5 * 10^23 atoms Au 4.2 * 10^24 atoms Au 4.2 * 10^23 atoms Au

What is true for the following reaction? Ca (s) + 2C (s) CaC2 (s) + 62.8 kJ It is an endothermic reaction and ∆H = + 62.8 kJ. It is an endothermic reaction and ∆H = - 62.8 kJ. It is an exothermic reaction and ∆H = + 62.8 kJ.

Which quantity represents the number of protons in an atom? (a) atomic number (b) oxidation number (c) number of neutrons (d) number of valence electrons

List the four (4) ways you can tell that a chemical reaction has occurred.

What is a light-year? A. the distance light travels in one earth year B. the distance light travels from the sun to the earth C. the distance light travels in one orbit of the moon D. the time it takes light to travel across the universe

What's is a logical way that you could begin to investigate why your tire had low air pressure?

after balancing the redox equation FeCl3+Zn--->ZnCl2+Fe, what are the coefficients, in order from left to right?

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?