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Questions in chemistry

[Homework Help] 1 mol of hydrogen gas and 1 mol of iodine vapor were mixed and allowed to react. After t seconds, 0.8 mol of hydrogen remained. The number of moles of hydrogen iodide formed at t seconds was: A) 0.2 B) 0.4 C) 0.8 D) 1.6 The answer is B. Please explain how you worked this out.

[Homework Help] How many atoms are in 3.50 moles of calcium (Ca)?

[Homework Help] What is the geometry of the HBr molecule? What is the geometry of the SF₂ molecule?

[Homework Help] Unknown element X combines with oxygen to form the compound [tex]XO_2[/tex]. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X? A. 16 amu B. 44 amu C. 88 amu D. 176 amu E. 352 amu

[Homework Help] How does the environment influence natural selection?

[Homework Help] Which of the gases listed below would not be collected via water displacement? A. CO₂ B. CH₄ C. O₂ D. NH₃ E. H₂

[Homework Help] What two categorical ways of thinking about matter are discussed in the passage?

[Homework Help] Complete the following chemical reactions: 1. NaOH + H\(_2\)SO\(_4\) → 2. NaOH + HNO\(_3\) → 3. Cu(OH)\(_2\) + HCl → 4. H\(_2\)SO\(_4\) → 5. HNO\(_3\) →

[Homework Help] In what respect does an atom of magnesium differ from a magnesium ion ([tex] \text{Mg}^{2+} [/tex])? A. The ion has a more stable electronic arrangement than the atom. B. The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom. C. The ion has two more protons than the atom. D. The ion will react more readily with free [tex] \text{Cl}_2 [/tex]. E. The ion has two more planetary electrons than the atom.

[Homework Help] Explain how engineers and scientists may work together to produce a protein in the lab.