An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. What other characteristic does the radiation have?some shielding required
no mass
large mass
high penetrating power
Answers
Answer: A) Some shielding required
Explanation:
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David says, "Pure honey has nothing else added." Susan says ,"The honey is not really pure. It is mixture of many subsatnces . Who is right? Explain your answer.
b. the pressure inside the balloon rises.
c. the volume of the balloon decreases.
d. the volume of the balloon increases
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for example, carbon 14 and carbon 12 both have 6 protons. The only thing that changed was the number of neutrons which went from 6 to 8.
ii) AlCl3 + NH4OH <----> Al(OH)3 + NH4Cl
iii) FeCl3 + Ca(OH)2 <----> CaCl2 + Fe(OH)3
iv) Pb(ClO3)2 + K2SO4 <----> PbSO4 + KClO3
v) Na + HOH <----> NaOH + H2
vi) Zn + HCl <----> ZnCl2 + H2
vii) Al + AgCH3COO <----> Al(CH3COO)3 + Ag
viii) MgO + HNO3 <----> Mg (NO3)2 + H2O
ix) MnO2 <----> Mn3O4 + O2
b) Why is it incorrect to alter the chemical formula when balancing an equation?
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i)
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B- Because chemical formula has its own unique set of elements and subscripts
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B. Exothermic reactions absorb heat.
C. There are no changes in heat during either reaction.
D. Endothermic reactions release heat.
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answer D
Explanation:hope thhis helped
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Endothermic reactions are reactions that proceed by the absorption of heat (energy) while exothermic reactions involve a release of energy.
a) Formation of frost on a car window in winter is an exothermic process as heat is liberated when liquid water freezes to form crystals
b) Formation of water condensate on a glass of ice water is an endothermic reaction since heat is absorbed by the cold water from the glass container thereby cooling it.
c) A decrease in the temperature as ammonium nitrate is added to water is an endothermic reaction
a) and b) are exothermic processes because they release heat to the surroundings. c) is an endothermic process because it absorbs heat from the surroundings.
Which of the following processes are exothermic and which are endothermic?
Let's analyze each option:
a) Frost forms on a car window in winter: Exothermic
Frost forming is an exothermic process because it releases heat as water vapor in the air condenses and freezes on the cold car window, giving off energy in the form of heat to the surroundings.
b) Water condenses on a glass of ice water on a humid summer afternoon: Exothermic
Similar to the first scenario, water condensation is exothermic. As water vapor from the humid air comes into contact with the cold glass of ice water, it condenses into liquid water, releasing heat to the surroundings.
c) Adding ammonium nitrate to water causes the temperature of the solution to decrease: Endothermic
This process is endothermic because dissolving ammonium nitrate in water absorbs heat from the surroundings, causing the temperature of the solution to decrease.
Learn more about exothermic and endothermic processes:
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Answers
Answer:
By measuring the total mass of the matter before as well as after any physical or chemical change.
Explanation:
As mentioned, according to the law of conservation of matter, no atoms can be created or destroyed when under physical or chemical change.
Naturally, all the matters have some mass associated with it.
To verify the law of conservation of matter, at first, measure the mass of matter before it underwent any physical or chemical change. Then, again, measure the mass of the matter after the physical or chemical change.
Now, observe both the mass, both must be equal. This verifies the law of conservation of matter.