A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10 years?

Small bodies from which the planets formed

Is hair abiotic or biotic

Without doing any calculations, determine which mass is closest to the atomic mass of carbon. without doing any calculations, determine which mass is closest to the atomic mass of carbon. 12.00 amu 12.50 amu 13.00 amu

How many sides does a triangle have? I cant figure it out (;

Orange juice has a ph of 3. pick the statement that describes its acidity a) it is neutral b) it is very acidic c) it is very basic d) it is slightly acidic

HBr + Mg (OH) 2 MgBr2 + H2O

What is the ability of a substance to be pulled into a wire? A malleability B ductility C conductivity D solubility

When a counterfeit detection pen is used on an authentic bill, what color does it turn? a. Pale blue b. Pale yellow c. Blue-black d. Pale pink

Why are the outer-most electrons the only ones included in the electron dot diagram?

What is the relationship between law of conservation and chemical reaction?