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Questions in chemistry

[Homework Help] Help please question is in picture xx

[Homework Help] How are matter and substances related?

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

[Homework Help] 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

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

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

[Homework Help] 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

[Homework Help] What is the difference between fission and fusion?

[Homework Help] 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.

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