Can you check if my answers are correct and correct it if it's wrong? The bold letters are my answers and the options are the ones that aren't bold
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Can you check if my answers are correct and correct it if it's wrong?

The bold letters are my answers and the options are the ones that aren't bold letters. Thank you in advance!


1. A 78.0 gram sample of unknown compound contains 12.4 grams of Hydrogen, what is the percent by mass of Hydrogen in the compound?
0.15
15.9
15.8


2. A 134.50 gram sample of aspirin is made up of 80.70 grams of Carbon, what is the percent by mass of Carbon in Aspirin? *
0.6
60
60.00
60.0


3. When wood burns, the mass of the soot, ashes and gases is lesser than the original mass of the charcoal and the oxygen when they are first reacted.
true
false


4. In physical change, substances can change form but the total mass remains the same.
True
False


5. What will be the visual evidence when Barium Chloride reacts with Sodium Sulfate?
white precipitate
red precipitate
yellow precipitate


6. Which definition best explains the law conservation of mass?
Mass is neither created nor destroyed during a chemical reaction
The mass after a chemical reaction is greater than the mass before
The mass before a chemical reaction is greater than the mass after
Chemical reactions never occur


7. Chemical reaction occurs when
when we eat
when we breathe
when we move
all of the above


8. Magnesium reacts with Oxygen to form *
MgO
Mg2O
Mg


9. Magnesium Hydroxide reacts with water to form
an acid
a base
a salt


10. Sulfur reacts with Oxygen to form
S2O
SO
SO2


11. Sulfur dioxide reacts with water to form *
acid
a base
a salt


12. What is the color reaction of the product formed in number 9 with litmus paper?
red to blue
blue to red


13. What is the color reaction of the product formed in number 11 with litmus paper?
red to blue
blue to red


14. The formula for Copper Sulfate Hydrate used in the video? *
CuSO4


15. Visual evidence when a metal reacts with an acid. *
formation of solution
formation of bubbles
formation of precipitate
Other:


16. These metals react vigorously with HCl. *
Al and Cu
Fe and Mg
Mg and Zn
Zn and Al


17. Visual evidence when Al reacts with HCl *
formation of bubbles
formation of white precipitate
formation of new solution
no reaction


18. Visual evidence when Zn reacts with HCl *
formation of bubbles
formation of white precipitate
formation of new solution
no reaction


19. Product formed when Mg reacts with HCl
MgCl + H
MgCl2+H2


20. Which of the following metals is not included in the video presentation? *
Zn
Al
Cu
Fe
Ca


21 . What product was formed when Zn reacted with Hydrochloric acid *
ZnCl + H- ZnCl2+H2


22. Type of reaction when Mg reacts with HCl *
direct combination
decomposition
single replacement
double replacement
Other:


23. Color of the solution when NaBr reacts with Chlorine water *
orange
colorless
reddish brown
purple
Other:


24. color of the solution when NaI reacts with hexane *
orange
colorless
reddish brown
purple


25. What will be the product formed when Potassium Chromate reacts with Lead Nitrate? *
KNO+PbCl

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