HRS - Ask. Learn. Share Knowledge. Logo

Questions in chemistry

[Done] Which substance will combine with oxygen gas to produce a greenhouse gas? A. Na B. S C. H₂ D. Ne E. C

[Done] Which of the following molecules has polar bonds but is a nonpolar molecule? a. H₂ b. H₂O c. NH₃ d. NaCl e. CO₂ Can anyone explain this one?

[Done] What is the electron configuration of helium?

[Done] Heating zinc sulfide in the air causes the formation of what compound?

[Done] During an investigation, a student determines that a copper sample has a density of 8.10 g/mL. What is the student's percent error if the accepted density for copper is 8.96 g/mL?

[Done] **A molecule of nitrogen gas consists of two nitrogen atoms joined together. Write the formula of nitrogen gas.**

[Done] Consider the elements neon, bromine, and phosphorus. Which has five electrons in its 4p sublevel?

[Done] When the following equation is balanced: \[ \text{C}_4\text{H}_{10} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} \] What is the coefficient of \(\text{CO}_2\)? a. 2 b. 4 c. 8 d. 10 e. 13

[Done] How many electrons are in a carbon-13 ([tex]^{13}\text{C}[/tex]) atom?

[Done] Which of the following changes will decrease the rate of collisions between gaseous molecules of type A and B in a closed container? A. decrease the volume of the container B. increase the temperature of the system C. add A molecules D. take away B molecules E. add an accelerating catalyst