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Anna71 [15]
2 years ago
15

Any collection of things that have some influence on one another can be thought of as a system. When we talk about a system, we

are also talking about all the parts that should be included, how those parts interact with one another, and to how the system as a whole relates to other systems. Consider the water cycle on Earth. Scientists have hypothesized about how climate change, specifically global warming, could impact the water cycle and therefore life on Earth. Scientists might consider specific research questions regarding this topic. They would include which questions listed above? A) I and II B) I, II, IV C) I and III D) I, II, III, IV
Chemistry
1 answer:
schepotkina [342]2 years ago
3 0

Answer:

d

Explanation:

d sound =s the back

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Why is there a change in energy during chemical reactions?(1 point)
Firdavs [7]

Energy is released by the formation of chemical bonds, and energy is

absorbed when the bonds are broken.

<h3>What is a chemical reaction?</h3>

A chemical reaction involves the formation of new compounds from

reactants . It involves the formation and breaking of bonds in the

elements.

Energy is released by the formation of chemical bonds and this type of

reaction is referred to as exothermic while energy is absorbed when the

bonds are broken and is referred to as an endothermic reaction.

Read more about Chemical reaction here brainly.com/question/16416932

8 0
2 years ago
Read 2 more answers
Complete the reaction, which is part of the electron transport chain. The abbreviation FMN represents flavin mononucleotide. Use
Margarita [4]

Answer:

1. NADH + H⁺ + FMN + Q ⟶ NAD⁺ + FMN + QH₂

2. The reactant that is reduced is Q

3. The charge on iron on the right side is +2, Fe²⁺

Explanation:

NADH + H⁺ + FMN + Q ⟶ NAD⁺ + FMN + QH₂

The reaction above is catalysed by NADH:ubiquinone oxidoreductase (complex 1), which transfers a hydride ion from NADH to FMN, from which two electrons pass through a series of of Fe-S centers to the iron-sulfur protein N-2. Electron transfer from N-2 to Ubiquinone forms QH₂

The species in a reaction which gains hydrogen irons is reduced,   Therefore, the reactant that is reduced is Q, ubiquinone to form QH₂, ubiquinol.

To determine the oxidation number of iron on the right side of the reaction below,

QH2 + 2cyt c ( Fe3+) ⟶ Q + 2cyt c(Fex) + 2H^+

Sum of charges on the left side = Sum of charges on the right side

Sum of charges on the left side = 2 *+3 = +6

Therefore 2 * x + 2= 6

2x = 6 -2 = 4

x = 4/

x = 2

Therefore the charge on iron on the right side is +2, Fe²⁺

4 0
3 years ago
Bromine has two isotopes, Br79 and Br81. The isotopes occur in a 50:50 (1:1) ratio. Given that the mass spectrum of bromine cont
AlekseyPX

Answer:

There will be 3 peaks.

Relative height of the atomic peaks would be; 158, 160 and 162

Explanation:

We are told that Bromine has two isotopes namely 79Br and 81Br in a 1 : 1 ratio (50 : 50).

This means that a compound which contains 1 bromine atom will have two peaks in the molecular ion region but it depends on which bromine isotope is contained in the molecular ion.

Thus;

Relative height of atomic peaks is given by;

m/z = 79Br¯ 79Br+ = 158

79Br¯ 81Br+ = 160

81Br¯ 81Br+ = 162

7 0
3 years ago
Pls help!!!<br><br> Briefly describe how plasma TVs display colour.
VashaNatasha [74]
When the electricity flows into a tube, gas atoms crash inside producing invisible ultraviolet rays. There is a white phosphor coating that turns the invisible rays into visible light. In a plasma tv the cells are like tiny cfls only coated in phonsophers that are rgb
8 0
2 years ago
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I don’t understand your language sorry
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