The amount of heat absorbed or released by the system can be determined by the equation:
U = mCpΔT
where:
m = mass of material
Cp = specific heat capacity of material; in this case, Cpwater = 4.186 J/(g-°C)
ΔT = change in temperature of material
U = 18(4.186)(20-(-10)) = 2260.44 Joules or B.
A positive term means energy was absorbed.
Answer:
D) Physical property
Explanation:
"A physical property is a characteristic of matter that can be observed and measured without changing the chemical identity of the sample," like color.
<span> sum all the atomic </span>mass<span> of the constituent atoms. For </span>example<span>, the </span>molar mass<span> of NaCl can be </span>calculated<span> for </span>finding<span> the atomic </span>mass<span> of sodium (22.99 g/mol) and the atomic</span>mass<span> of chlorine (35.45 g/mol) and combining them.</span>
Answer:
in days
Explanation:
A short term environmental change refers to changes in the environment that happens within a short period of time, for example, flooding, drought, volcanic eruptions etc. In contrast to short term environmental change, long term environmental change takes place over a long period of time hence species have a longer time to adapt to it. Short term environmental changes may or may not be caused by humans. An example of a short term environmental change caused by humans is oil spillage. Short term environmental changes may lead to the the migration of species from the ecosystem.
Short term environmental changes usually occur within a very short time. The greatest time frame in which a short term environmental change can occur is in a matter of days. Only longterm environmental changes span hundreds and thousands of years.
Mass of Calcium phosphate : = 21127.7 g
<h3>Further explanation</h3>
Given
4.1 x 10²⁵ particles of Calcium phosphate
Required
mass
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
mol Calcium phosphate :
n = N : No
n = 4.1 x 10²⁵ : 6.02 x 10²³
n = 68.11
mass Calcium phosphate Ca3(PO4)2 :
= mol x MW
= 68.11 x 310.2 g/mol
= 21127.7 g
= 21.13 kg