## 7A.3

$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

Skyllar Kuppinger 1F
Posts: 52
Joined: Thu Jul 25, 2019 12:16 am

### 7A.3

Why is the "rate at which oxygen reacts" written as a positive number? Oxygen is a reactant. In what situation would we write the negative sign?

ALegala_2I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

### Re: 7A.3

Since the question is asking about the rate of consumption, it is already taking into account that oxygen is being used up. Therefore the answer is meant to be positive in terms of consumption rate.

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

### Re: 7A.3

Rates are generally never expressed as negative, even when referring to reactants.

Charlene Datu 2E
Posts: 62
Joined: Wed Sep 11, 2019 12:16 am

### Re: 7A.3

A rate is inherently a positive value, whether or not the molecule is being consumed or produced

Junwei Sun 4I
Posts: 125
Joined: Wed Oct 02, 2019 12:16 am

### Re: 7A.3

The question is already stating "rate of consumption" of oxygen therefore sign is already taken into account in this case.

Trent Yamamoto 2J
Posts: 111
Joined: Sat Aug 17, 2019 12:18 am

### Re: 7A.3

A rate is usually referred to as a positive number and already takes this into account

Tanmay Singhal 1H
Posts: 143
Joined: Sat Jul 20, 2019 12:16 am

### Re: 7A.3

rates can never be negative. even if it is backward reaction the rate is positive