Climbing up something and moving higher.
The correct answer to this question is letter "B. the battery
."
Attached to this answer is an image that shows the connection of the battery to the switch to the bulb.
There exists the same question from other source with the following choices:
<span>A. the wires
B. the battery
C. the switch
D. the light bulb</span>
Answer:
The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ
Explanation:
<u>Step 1: </u>The balanced equation
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) ΔH = -802 kJ
<u>Step 2:</u> Given data
We notice that for 1 mole of methane (CH4), we need 2 moles of O2 to produce : 1 mole of CO2 and 2 moles of H20.
The enthalpy change of combustion, given here as Δ
H
, tells us how much heat is either absorbed or released by the combustion of <u>one mole</u> of a substance.
In this case: we notice that the combustion of 1 mole of methane gives off (because of the negative number), 802.3 kJ of heat.
<u>Step 3: </u>calculate the enthalpy change for 3 moles
The -802 kj is the enthalpy change for 1 mole
The change in enthalpy for 3 moles = 3* -802 kJ = -2406 kJ
The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ
Answer:
concrete
Explanation:
because it is simply a variety of calcium compounds in a single mixture. when mixed with water and solid substances , it become concrete.
Answer:
Option 5.
Equal amounts of hydroxide and hydronium ions
Explanation:
2H₂O ⇄ H₃O⁺ + OH⁻ Kw: 1×10⁻¹⁴
Neutral solution has pH = 7
So, [H₃O⁺] = [OH⁻]
In solutions of only pure water:
[H₃O⁺] = 1×10⁻⁷ M
[OH⁻] = 1×10⁻⁷ M
Kw = [H₃O⁺] . [OH⁻] → 1×10⁻⁷ . 1×10⁻⁷ = 1×10⁻¹⁴
