Radioisotopes tell scientists that Earth is how old?

A. 65 million years

B. 500 million years

C. 4.5 billion years

D. 13.4 billion years

Which is a proper description of chemical equilibrium? (A) The frequencies of reactant and of product collisions are identical. (B) The concentrations of products and reactants are identical.

Which part of an atom has a negative charge? Question 1 options: neutron proton nucleus electron

A container holds a sample of hydrogen at 300 K with a pressure of 10 ATM when the temperature decreased to 100k and Volume remained constant. A. 3000 atm B. 3.3 atm C. 0.1 atm D. 0.3 atm

The chemical formula for table sugar is C12H11O22. What can you tell from this formula? There are 22 protons in an oxygen atom. There are 12 electrons in a carbon atom. The ratio of oxygen atoms to hydrogen atoms in a molecule of sugar is 2 to 1.

State one reason why this is the recommended procedure for placing a coverslip

A design team has come out with four different plans for building a bridge across a small stream. What is the quickest and most economical way of picking the right plan?

Is a gas that is produced by the ultraviolet radiation in the air in the vicinity of welding operations?

How much MnO2 (s) should be added to excess HCl (aq) to obtain 295 mL of Cl2 (g) at 25 °C and 735 Torr?

Why do people describe water as a universal solvent

What is litmus paper used for? To indicate if all the reactants have been used up to determine if a chemical reaction has occurred to determine pH to detect the presence of water