Scientific models are based on a set of observations. true or false

Chemistry

2 answers:

dimulka [17.4K]4 years ago

8 0

True it is based on a set of observations

bixtya [17]4 years ago

5 0

True. A model is made after a bunch of conclusions are made, as well as observations.

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For each of the following acid-base reactions, calculate how many grams of each acid are necessary to completely react with and

Anika [276]

Answer:

$m_{HCl}=2.19gHCl$

Explanation:

Hello,

In this case, for the reaction between hydrochloric acid and sodium hydroxide, for 2.4 g of base, we can compute the neutralized grams of acid by applying the 1:1 molar ratio between them and their molar masses, 36.45 g/mol and 40 g/mol respectively as shown below by stoichiometry:

$m_{HCl}=2.4gNaOH*\frac{1molNaOH}{40gNaOH}*\frac{1molHCl}{1molNaOH}*\frac{36.45gHCl}{1molHCl}\\ \\m_{HCl}=2.19gHCl$

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For the reaction: 2 A+B 3 C the rate of disappearance of B was 0.30 M/s. What is the rate of disappearance of A and the rate of

GenaCL600 [577]

Answer:

rA = 0.60 M/s

rC = 0.90 M/s

Explanation:

Let's consider the following reaction:

2 A+B ⇒ 3 C

The rate of each substance can be calculated like the change in its concentration divided by the change in time. Given the rate must always be positive, we add a minus sign before the reactants change in concentration.

$rA=-\frac{\Delta[A] }{\Delta t}$