When a hypothesis is tested and shown to be incorrect is the experiment a failure?

1 answer:

6 0

No. Testing hypothesis is part of scientific method, and proving or rejecting then are both valid results of the experiments.

If the hypothesis is shown to be incorrect the experiment is a succesful result. The role of science is to try discover facts and form theory. The rejection of hypothesis also produces knowledges and provide insight leading to the development of science.

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What is the difference between a molecule name and a chemical formula?

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A formula must always be written using element symbols (NaCl, for example) whereas a molecule can be named using symbols (NaCl) or written (sodium chloride).

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Which of the following reactions is an example of a single replacement reaction?

qwelly [4]

Answer:

Explanation:

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To determine the mass of CO2 that forms from a given mass of CaCO3, which of the following must be known? Check all that apply.

ZanzabumX [31]

To determine the mass of CO₂, the following must be known :

the molar mass of CaCO₃
the mole ratio of CaCO₃ to CO₂
the molar mass of CO₂

<h3>Further explanation</h3>

Reaction

Decomposition of CaCO₃

CaCO₃ ⇒ CaO + CO₂

Given the mass of CaCO₃, so to determine the mass of CO₂ :

1. Find the mol of CaCO₃ from the molar mass of CaCO₃

$\tt n_{CaCO_3}=\dfrac{mass~CaCO_3}{MW~CaCO_3}$

2. Find the mole ratio of CaCO₃ : CO₂(from equation = 1 : 1)

$\tt n_{CaCO_3}\div n_{CO_2}=1\div 1$

3. Find the mass of CO₂ from the molar mass of CO₂

$\tt mass_{CO_2}=n_{CO_2}\times MW_{CO_2}$

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Which of the following is the best evidence for a chemical reaction?

alisha [4.7K]

C. Formation of a new substance

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Why does knowing the mass of an object not help you identify what material the object is made from?

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Because mass is not always the same for objects made from the same material. Just because an object has the same mass as another doesn’t mean they are the same material.

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