According to Table N, which radioactive isotope is best for determiningthe actual age of Earth? (1) 238 U (3) 60 Co (2) 90 Sr (4) 14 C

In any chemical reaction, the quantities that are conserved are ... A. mass and moles. B. the number of molecules and the volumes. C. the number of moles and the volumes. D. mass and number of atoms.

Put the following events and discoveries into the correct chronological order. 1 Albert Einstein: photoelectric effect 2 Ernest Rutherford: discovery of the nucleus 3 Niels Bohr: planetary model 1, 2, 3 1, 3, 2 2, 3, 1 2, 1, 3

The pressure in an engine cylinder increases from 7.6 atm to 13 atm as the gas is compressed from 0.50 L to 0.10 L. What is the expected cylinder temperature if the gas was initially 15°C? (Remember to express answer to correct significant figures.)

3. Lists of observable changes that suggest a chemical or physical change has occurred Sorry this is science but I couldn't find it so I choose Chemistry

Form a hypothesis sharks don't have swim bladders and must move constantly or they sink. hypothesize about the amount of food that a shark must eat compared to the amount eaten by a bony fish of the same size

4. Given the chemical formulas of the following compounds, name each compound and state the rules applied to determine each name. Score • RbF • CuO • (NH4) 2C2O4 (Note: C2O4 - is called oxalate.)

The earth names for the 30 alien elements in order of atomic number

Worth 30 pts. Liquid vinegar and solid baking soda chemically react to form solid sodium acetate, liquid water, and carbon dioxide gas.

The electron configurations of two unknown elements X and Y are shown. X: 1s22s22p6 Y: 1s22s22p63s23p6 Which statement is most likely correct about the two elements?

Which is the best example of a closed system