An element with the atomic number of 13 and mass number of 27 has how many neutrons?

Which of these is a combustion and synthesis reaction? A. CH4 + 2 O2 → CO2 + 2 H2O B. Mg + O2 → MgO C. H2O → H2 + O2 D. CaO → Ca + O2

What is the volume of an alka seltzer tablet

How does sound travel

Which of the following is true concerning rainforest deforestation? a. It enhances soil's water carrying capacity. b. It contributes to global warming. c. It reduces or eliminates flooding and erosion. d.

What is meant by controlled variable in chemistry

A radioisotope used for diagnosis must emit gamma rays of sufficient energy to escape from the body and it must have a half-life short enough for it to decay away soon after imaging is completed. TRUE FALSE

Silicon is lustrous and is a conductor of heat and electricity. Which class of elements could this element belong to? A. Metal B. Non-metal C. Metalliod D. All of the above

What type of mixture is 100 ml of water with a little bit of salt?

In the process of covalent bonding, atoms share electrons. This means that * a) Electrons from each atom are attracted to the nucleus of both atoms b) Protons and neutrons attract c) Atoms lose electrons and become ions d) Atoms gain electrons and

5. How are compounds different from mixtures?