C12 has 6 protons. how many neutrons does c13 have? a. 6 b. 7 c. 13 d. 19

What is the empirical formula for a substance that contains 3.730% hydrogen, 44.44% carbon, and 51.83% nitrogen by mass?/?

Why does a tadpole reabsorb its tail into its body? The cells failed to grow. The cells were programmed to die. The cells were diseased. The cells mutated.

The volume of a gas is 605 liters at 27.0. The new temperature is - 3.0 C. What is the new volume

If uranium-235 is bombarded with a neutron, it will temporarily become uranium-236 lead-235 plutonium-236

What is the name of the covalent compound that consists of two atoms of silicon and six atoms of bromine? What is its chemical formula?

Andrea is performing an experiment in which she needs to know when a strong acid is present. She is not sure which indicator to use, so she looks up the following table in her science textbook. Indicator pH range thymol Blue 1.2 - 2.8 phenol Red 6.

Which represents the balanced nuclear equation for the beta plus decay of C-11? Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 5 upper B plus superscript 0 subscript plus 1 e.

Make a prediction for how to identify an unknown element and the chemical composition of a star

The density of HCN (hydrogen cyanide) gas at STP is 1.21g/L. What volume will 100.0g of HCN occupy at STP? A) 121 L B) 0.012 L C) 82.6 L D) none of the above

A 20.0 ml sample of 0.150 m ethylamine is titrated with 0.0981 m hcl. what is the ph after the addition of 5.0 ml of hcl? for ethylamine, pkb = 3.25