Conservation of mass unit test please I need these answers asap!!
here are the links i used
quizlet.com/659137680/conservation-of-mass-unit-test-flash-cards/
brainly.com/question/27200522
if those aren't the answers then i apologize, the quizlet and brainly i got them from had high reviews at the time of making this so I'm assuming they're correct, i was also unable to check my test to see if they were correct
1. Matter may be lost to or gained from the surroundings.
2. Yes, it supports the claim because the equation is balanced.
3. The bubbling indicates a gas was formed, so some atoms formed gas; therefore, mass was transferred to the atmosphere.
4. one-twelfth the mass of a neutral carbon atom
5. Mass is conserved because the number of each atom in the reactants equals the number of each atom in the products.
6. 129.59 g/mol
7. the number of atoms in the reactants
8. 2Fe2O3
9. 112 g CaO and 88 g CO2
10. 274 g
11. For every 3 moles of carbon dioxide produced, 5 moles of oxygen react.
12. 96
13. 1.776×1022
the rest are essay questions, i have the answers but I'd recommend changing it up some to stay safe
14. yes the law of conservation holds that mass can not be destroyed but can only take on different forms. So if 5 g of water becomes a gas it becomes 5 g of water vapor. The mass of the liquid water is simply transferred into the mass of the newly formed water vapor.
15. he mistake here is the fact the student turned the moles back into mass and then multiplied the mass by Avogadro's number (6.02 x ), which gave him a false answer. To get the correct answer, he had to multiply the number of moles of ammonium acetate by Avogadro's number for the number of molecules.
Number of molecules = Moles times avogadro's number
Number of molecules = 0.100 times (6.02times10^23)
Number of molecules = 6.02 times 10^22
The correct number of molecules of ammonium acetate used in the reaction is 6.02 x moles
16. The number of moles of ethanol the chemist will use in the experiment involving 30g of ethanol is 0.65moles.
How to calculate number of moles?
The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass. That is;
no. of moles = mass ÷ molar mass
According to this question, a chemist will use a sample of 30 g of ethanol (CH3CH2OH) in an experiment. The number of moles can be calculated as follows:
Molar mass of ethanol = 12(2) + 1(5) + 17 = 46g/mol
no of moles = 30g ÷ 46g/mol
no. of moles = 0.65moles
Therefore, the number of moles of ethanol the chemist will use in the experiment involving 30g of ethanol is 0.65moles.
dr bob a lot of us are just trying to make it through the year passing so get off our case and stop trying to chastise a bunch of high schoolers
get a life <3