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2 years ago

9

Water, H2O, is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to shared electrons,

and known as __________ bonds. A) covalent B) dependent C) ionic D) nuclear

2 answers:

snow_tiger [21]2 years ago

6 0

The answer is A.Covalent bonds

defon2 years ago

5 0

Answer: A. covalent bonds

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Which statement is true of a heterogeneous mixture but not of a

Natalka [10]

Answer:

B

Explanation:

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a example of this can be

Soil, oil in water, ice in water

while Homogeneous mixture cannot be seen seperated

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3 years ago

Pls help Combustion is commonly referred to as _____.

kati45 [8]

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Explanation:

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2 years ago

Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2NH3(g) 3N2O(g)4N2(g) 3H2O

trasher [3.6K]

Answer: $\Delta H^{0} = -879.15 kJ/mol$

Explanation: <u>Heats</u> <u>of</u> <u>formation</u> is the amount of heat necessary to create 1 mol of a compound from its molecular constituents. The basic conditions the substance is formed is at standard conditions: 1 atm and 25°C. Each compound has its own heat of formation per mol of compound (kJ/mol), but to an element is assigned a value of zero.

<u>Standard</u> <u>Enthalpy</u> <u>Change</u> is defined as the heat absorbed or released when a reaction takes place. It can be positive or negative, which means reaction is endothermic or exothermic, respectively.

Enthalpy change is calculated as the difference between the sum of heat formation of products and the sum of heat formation of the reactants:

$\Delta H^{0}=\Sigma H^{0}_{f}_{(products)}-\Sigma H^{0}_{f}_{(reactants)}$

For the reaction

2NH₃ + 3N₂O → 4N₂ + 3H₂O

2(-46.2) + 3(82.05) 4(0) + 3(-241.8)

$\Delta H^{0}=3(-241.8)-[ 2(-46.2)+3(82.05)]$

$\Delta H^{0}=-725.4-153.75$

$\Delta H^{0}=-879.15$

<u>The standard enthalpy change for the reaction is </u> $\Delta H^{0}=-879.15$ <u> kJ</u>

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2 years ago

Which beach will be most affected by wind erosion? Why ?

laila [671]

Answer: A

Explanation: There is a lot of sand that will blow and form dunes unlike option b

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2 years ago

How many moles of water in 100 grams

Bond [772]

Answer:

There are approximately 5.55 moles

Explanation:

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2 years ago