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NARA [144]
3 years ago
15

when a log of wood burns, it undergoes a _______. a. physical change. b. chemical change. c. physical and a chemical change. d.

no physical or chemical change.
Chemistry
2 answers:
AlexFokin [52]3 years ago
6 0

B. chemical change because a new substance is forming with new properties.

statuscvo [17]3 years ago
3 0
B. Chemical change is the answer!<span />
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Some chemical reactions releases energy other store energy what important chemical reaction storage energy?
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Answer:

A chemical reaction that stores energy is called an endothermic reaction. More energy might be released as products form than the energy needed to break the reactants apart. This chemical reaction will release energy. In other words, it will be an exothermic reaction.

Explanation:

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3 years ago
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55.99 mols of nickel carbonyl produces how many grams of nickels?
Alinara [238K]

Answer:

3286 grams

Explanation:

For every mol of Ni(CO)4 reactant, a mol of Ni is produced (55.99 mol). Multiply this by the molecular mass of Ni (58.69 g/mol) to give 3286 grams

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2 years ago
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The equilibrium constant for the chemical equation N2(g) + 3H2(g) ⇌ 2NH3(g) and Kp=0.174 at 243°C. Calculate the value of Kc for
Mashcka [7]

Answer:

The Kc of this reaction is 311.97

Explanation:

Step 1: Data given

Kp = 0.174

Temperature = 243 °C

Step 2: The balanced equation

N2(g) + 3H2(g) ⇌ 2NH3(g)

Step 3: Calculate Kc

Kp = Kc *(RT)^Δn

⇒ with Kp = 0.174

⇒ with Kc = TO BE DETERMINED

⇒ with R = the gas constant = 0.08206 Latm/Kmol

⇒ with T = the temperature = 243 °C = 516 K

⇒ with Δn = number of moles products - moles reactants  2 – (1 + 3) = -2

0.174 = Kc (0.08206*516)^-2

Kc = 311.97

The Kc of this reaction is 311.97

3 0
3 years ago
Does anyone know how to make this a longer sentence?
Nadusha1986 [10]

Answer:

First, you have to analyze your problem or question. After you research and collect data about your topic, create a hypothesis to test to try and find the answer. After testing your hypothesis, come up with a conclusion based on the results.

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Which state of matter is being described below?
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C. Gas

Explanation:

I think this is the right answer because it fits the description

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