Answer:
Explanation:
<u>Given reaction is:</u>
3X + 2Y → 5C + 4D
<u>In this reaction, we have:</u>
For 3 moles of X, 4 moles of D
So,
4D = 3X
Divide both sides by 4
D = 3X/4
Multiply both sides by 21
21D = 3X/4 × 21
21D = 3*21X/4
21D = 63X/4
21D = 15.75X
So, to produce 21 moles of D, we need 15.75 moles of X.
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
Hope this helped!
<h3>~AH1807</h3>
Answer:
while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules can be used to determine species' relatedness.
Explanation:
Answer:
1. chemical property
2. chemical property
3. chemical change
4. physical change
5. physical property
6. chemical change
7. chemical change
8. chemical property
9. physical property
10. physical property
11. physical change
12. chemical change
13. chemical change
14. chemical change
15. true
16. true
17. false
18. true
19. false
20. true
21. chemical change
22. physical change
23. chemical change
24. chemical change
Explanation:
Like it says in the worksheet, for questions 1-14, you can tell the difference between a property and change by whether there is a verb in the description.
If the object is simply changing form (melting, freezing), it is a physical change or property. The object can be returned to the state it was in originally without much difficulty. You can freeze water and turn it into ice. You can just as easily melt the ice and turn it into water again.
If the object is actually changing its composition or a reaction is taking place (baking bread, combustion), it is a chemical change or property. It is not as easy and sometimes even impossible to change back to its original state. If you have a bike that is rusted, you cannot really do much to change it back to how it was before it got rusty.
Hope this helps! <3
