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Makovka662 [10]
3 years ago
12

Air is made up of about 21% oxygen and 78% nitrogen.

Chemistry
1 answer:
gladu [14]3 years ago
6 0
I believe its A "Air is made up of about 21% oxygen and 78% nitrogen. In this solution, oxygen is the solute and nitrogen is the solvent.
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The crust and upper mantle make up Earth's ____.
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a. the lithosphere

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The melting points of alkaline earth metals are many times higher than those of the alkali metals. Explain this difference on th
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The correct answer is higher melting point, bound by metal metal bonds.

While alkali metals only have one valence electron, alkaline earth metals have two. Metal to metal connections hold the metals together. Alkaline earth metals have a stronger metallic connection and a higher melting point because they have two valence electrons.

the characteristics that Group 2 metals excel in over Group 1 metals.

  • Initial Ionization Potential
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As a result, group 2 metals have stronger metallic bonding, which leads to increased cohesive energy and compact atom packing. This explains why group 2 metals are harder and have higher melting and boiling temperatures than group 1 metals.

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3 0
2 years ago
how does the processes of photosynthesis and cellular respiration allow for the flow of energy in organisms
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Photosynthesis and cellular respiration go hand and hand. Remember the two equations are just a reverse of the opposite equation. 

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Photosynthesis-
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</span>
When a plant goes through photosynthesis it produces oxygen as a waste product, which you should know is what animals use to breathe, well when animals use oxygen in the process, they also make a waste product which happens to be Carbon Dioxide, which a plant uses to make glucose during photosynthesis, so if we didin't have one we wouldn't have the other.
8 0
3 years ago
Which methods are used to construct earthquake resistant buildings?
san4es73 [151]

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shear walls, cross braces, diaphragms, and moment-resisting frames are central to reinforcing a building. Shear walls are a useful building technology that helps to transfer earthquake forces. Made of panels, these walls help a building keep its shape during movement.

Explanation:

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3 years ago
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tamaranim1 [39]

Answer:

The equilibrium will go right, increasing the quantities of Y(g) and Z(s), when the amount of X(g) increases.

Explanation:

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By Le Chatêlier's principle, when the equilibrium is disturbed, the equilibrium must shift to reestablish the equilibrium. Thus, when X is put in the container, it intends to decompose and form Y and Z, thus, as higher is the initial X, as higher is the Y and Z formed.

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