All matter is made up of substances called elements, which have specific chemical and physical properties and cannot be broken down into other substances through ordinary chemical reactions. Gold, for instance, is an element, and so is carbon. There are 118 elements, but only 92 occur naturally.
<h3>
<u>P</u><u>LEASE </u><u>MARK</u><u> ME</u><u> BRAINLIEST</u><u>.</u></h3>
Answer:
![\boxed{\text{11.8 kJ}}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Ctext%7B11.8%20kJ%7D%7D)
Explanation:
The formula for the heat released is
q = mCΔT
Data:
m = 28.9 g
C = 0.385 J·°C⁻¹g⁻¹
T₁ = 1083 °C
T₂ = 25.0 °C
Calculations:
(a)Temperature change
ΔT = T₂ - T₁ = 25.0 - 1083 = -1058 °C
(b) Heat released
q = 28.9 × 0.385 × (-1058) = -11 800 J = -11.8 kJ
The negative sign shows that energy is released, so the copper has released
of energy.
Theoretically, You can calculate the combined force, which is known as "Net force", in real life, combination of force does make sense only when you're talking about their addition [ which must be in same direction ]
Hope this helps!
No it’s -3 not +3
There is an order on the periodic table
Group 1 =+1
Group2=+2
Group 3=+3
Group 5=-3 (which is the group p is in)
Group 6=-2
Group 7=-1
Answer:
When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called an ionic compound. In all of these reactions, the metal atoms give electrons to the non-metal atoms.