1 is d 2. a 3. c
step by step
Answer:
A. It is exothermic
Explanation:
Combustion is a chemical reaction in which a substance combines with oxygen present in air to produce carbon (iv) oxide and water as well release heat and light energy.Combustion is an exothermic process.
An exothermic reaction releases energy in the form of heat to the surroundings. The energy required to break bonds in the reactants is less than the energy required to form new bonds in the products in an exothermic reaction.
From the given options;
A. It is exothermic is determinable since the reaction is a combustion reaction
B. The bond making energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather it is composed of various substances.
C. It is endothermic. is wrong because combustion of wood is exothermic.
D. The bond breaking energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather is composed of many substances.
Answer is: there are 5,275·10²³ hydrogen atoms in methane.
m(CH₄) = 3,50 g.
n(CH₄) = m(CH₄) ÷ M(CH₄).
n(CH₄) = 3,5 g ÷ 16 g/mol.
n(CH₄) = 0,219 mol.
n(CH₄) : n(H) = 1 : 4.
n(H) = 4 · 0,219 mol = 0,876 mol.
N(H) = n(H) · Na.
N(H) = 0,876 mol · 6,022·10²³ 1/mol.
N(H) = 5,275·10²³.
Na - Avogadro number.
The correct answer of equilibrium concentration of BrCl is 0.2292 M.
The balanced chemical equation:
Br2(g) + Cl2(g) = 2BrCl(g)
[Br2] = [Cl2] = (0.2 - x) M
[BrCl] = (2x) M
7.20 = [2x / (0.2 - x)]2
2.6833 = 2x / (0.2-x)
2.6833 × (0.2 - x) = 2x
0.53666 - 2.6833x = 2x
0.53666 = 4.6833x
x = 0.1146
[Br2] = [Cl2] = 0.2 - x = 0.2 - 0.1146 = 0.0854 M
[BrCl] = 2x = (2 × 0.1146) = 0.2292 M
[BrCl] = 0.2292 M
<h3>
What is equilibrium concentration?</h3>
A chemical reaction is considered to be in a state of chemical equilibrium when both the reactants and the products are in a concentration that does not change over time any more. The forward response rate and the backward reaction rate are equal in this condition. You can determine the equilibrium concentration for a reaction if you know the starting concentrations of the constituent chemicals.
learn more about equilibrium concentration refer:
brainly.com/question/517289
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<span>magnification(m)=imagedistance(v)÷objectdistance</span><span>
Here, the magnification will be 2. Therefore, the height of the image will be twice the height of the object, which is, 4*2= 8 cm.</span>