HRS - Ask. Learn. Share Knowledge. Logo

Questions in chemistry

[Done] Help please question is in picture xx

[Done] How are matter and substances related?

[Done] Which of the following solutions would be basic? A. NH₄I B. NaOCl C. Fe(NO₃)₃ D. Ba(NO₃)₂ E. NH₄NO₂

[Done] If 250 mL of a 0.50 M NaCl solution is diluted to 840 mL, what is the molarity of the resulting solution? a) 0.15 M b) 6.7 M c) 0.60 M d) 1.7 M e) 0.0025 M

[Done] How many valence electrons does [tex]N_2[/tex] have after the bond? Is it 2, 6, or 8 electrons?

[Done] Describe how a physical property, such as mass or texture, can change without causing a change in the substance.

[Done] Which of the following pairs of substances can be broken down chemically? A. Ammonia and iron B. Helium and argon C. Methane and water D. Potassium and lithium E. Water and carbon

[Done] What is the difference between fission and fusion?

[Done] Which of the following is not true regarding gases? A. When the temperature of a gas decreases, its volume increases if the pressure is held constant. B. Equal volumes of gases at the same temperature and pressure contain the same number of molecules. C. The molecules of gas are in constant motion.

[Done] Why do the two elements silver and iron have different properties?