What characteristic of an element determines its specific isotope?

A. Number of protons.

B. Number of neutrons.

C. Number of electrons.

D. Number of quarks.

Calculate the standard enthalpy of the reaction, ΔH∘rxn, for the thermite reaction: 2Al (s) + Fe2O3 (s) →2Fe (s) + Al2O3 (s) Elements in their standard state have an enthalpy of formation value of zero.

The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90° bond angle in it. (In each case except water, the central atom is the first one in the formula.

What is the percent by mass of hydrogen in aspirin (c9h8o4) ?

Explain why both square planar and tetrahedral complexes have coordination number=4, and yet square planar complexes can never be chiral while tetrahedral complexes can.

One isotope has 6 protons and 8 neutrons which reference names this isotope

When an atom that has no charge loses two electrons, it becomes a: A: positive ion. B: negative ion. C: positive isotope. D: negative isotope.

A 155.0 9 piece of copper at 182 °C Is dropped into 2500 g of water at 23.9 °C. (The specific heat of copper is 0.385 1/9°C.) Calculate the final temperature of the mixture. (Assume no heat loss to the surroundings.)

Which state of matter is characterized by having an indefinite shape, but a definite volume? Gas Liquid Solid None of the above

What metric unit is used to measure distance?