B. The atomic number ........
The piece of unknown metal is in thermal equilibrium with water such that Q of metal is equal to Q of the water. We write this equality as follows:
-Qm = Qw
Mass of metal (Cm)(ΔT) = Mass of water (Cw) (ΔT)
where C is the specific heat capacities of the materials.
We calculate as follows:
-(Mass of metal (Cm)(ΔT)) = Mass of water (Cw) (ΔT)
-68.6 (Cm)(52.1 - 100) = 42 (4.184) (52.1 - 20)
Cm = 1.717 -----> OPTION C<span>
</span>
Answer:
-2,438 J energy is released
Heat energy is released
Explanation:
The formula for energy absorbed or released is Q = mT(Cp)
Get temperature in degrees T = 21 - 63 = -42°C
Mass of the cooling cooper m = 150g
Specific heat of copper Cp = 0.387J/g-°C
Put all the above parameters into the formula for energy absorbed or released
Q = mT(Cp)
= 150 x -42(0.387)
= -2438J same as -2.438 KJ
-2438J energy is released
In chemistry, neutralization<span> or </span>neutralisation<span> (see spelling differences), is a chemical </span>reaction<span> in which an acid and a base </span>react<span> quantitatively with each other. In a </span>reaction<span> in water, </span>neutralization<span> results in there being no excess of hydrogen or hydroxide ions present in solution</span>
<span>2CH3COOH + Sr(OH)2 → (CH3COO)2Sr + 2H2O
ethanoic acid reacts with strontium hydroxide to produce strontium ethanoate plus water.</span>
Answer:
B. Shrimp
Explanation:
The shrimp only eat diatoms and dinoflagellates who get their energy from the sun, making them producers