Is color change a physical or chemical change?

Acid and base ph PhET simulation lab

Which event would be impossible to explain by using John Dalton's model of the atom? A) An iron atom emits particles when it is struck by light. B) An oxygen atom combines with two hydrogen atoms to form water.

If an adult dog has 78 chromosomes, the number of chromosomes in a dog's sperm cell will be.

As the atoms of the elements in group 1 are considered in order from top to bottom, compared to the ionization energy of the atom above it, the ionization energy of each successive atom

Molecular formula of SO2

Na + leaks through neuron membranes faster than k + because of the properties of the non-gated leak channels. na + leaks through neuron membranes faster than k + because of the properties of the non-gated leak channels. a. True b. False

How many protons does one atom of sulfur have

Which shows the electron configuration for zinc (Zn) ? [Kr]5s24d10 [Kr]5s24d6 [Ar]4s23d9 [Ar]4s23d10

What is the oxidation number of chromium in the ionic compound ammonium dichromate (nh4) 2cr2o7?

Draw an ecosystem with 10 biotic and 5 abiotic factor