The correct answer to this open question is the following.
Two examples of how engineers use their knowledge of atoms to create new technologies would be the following.
1.- Engineers can develop new medicines for chronic diseases when they use their knowledge about atoms. With new technologies and different scientific approaches, this new molecular medicine can be more effective in the treatment of terrible diseases that affect humans. The challenge lies in how to make these new medicines more affordable to all kinds of people, not only rich people.
2.- Engineers can also apply their knowledge about atoms to improve the water conditions so more people can have freshwater. Engineers that specialize in the environment can research the properties of water molecules and atoms, so they can develop new ways to purify and improve the quality of water, that we know that water scarcity is a major problem in many parts of the world.
Hydrogen gas reacts with oxygen gas to form water according to the equation
![2H_{2(g)} + O_{2(g)} --\ \textgreater \ 2 H_{2}O_{(l)}](https://tex.z-dn.net/?f=%202H_%7B2%28g%29%7D%20%2B%20%20O_%7B2%28g%29%7D%20%20--%5C%20%5Ctextgreater%20%5C%20%202%20H_%7B2%7DO_%7B%28l%29%7D)
From the coefficients in the reaction equation, we can see that it takes two molecules of hydrogen to react with one molecule of oxygen. Since we begin with equal amounts of both gasses, we can conclude that hydrogen is the limiting reactant because we use it up first. Thus, we use hydrogen for our stoichiometry that follows.
![(6 molecules H_{2} ) ( \frac{2 molecules H_{2}O }{2 molecules H_{2} } ) = 6 molecules H_{2}O](https://tex.z-dn.net/?f=%286%20molecules%20%20H_%7B2%7D%20%29%20%28%20%5Cfrac%7B2%20molecules%20%20H_%7B2%7DO%20%7D%7B2%20molecules%20%20H_%7B2%7D%20%7D%20%29%20%3D%206%20molecules%20%20H_%7B2%7DO%20)
Thus, the answer is B, 6 water molecules are produced with hydrogen being the limiting reactant
Answer:
H2(hydrogen gas)
Explanation:
The reaction between magnesium and hydrochloric acid combine to form a salt (magnesium chloride) and release gas (hydrogen).
Answer:
decrease
Explanation:
I assume you mean pH, the pH will decrease as there are more H+ ions inside the water