In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.
Models have a variety of uses – from providing a way of explaining complex data to presenting as a hypothesis. There may be more than one model proposed by scientists to explain or predict what might happen in particular circumstances. Often scientists will argue about the ‘rightness’ of their model, and in the process, the model will evolve or be rejected. Consequently, models are central to the process of knowledge-building in science and demonstrate how science knowledge is tentative.

7 0

3 years ago

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How many oxygen atoms are in 1.90 g of quartz?

san4es73 [151]

The chemical formula for quartz is SiO₂. It has a molar mass of 60.08 g/mol. We use this to find the moles of quartz.

Moles of quartz = 1.90 g(1 mol/60.08 g) = 0.03162 moles

From the chemical formula, there are 2 moles of Oxygen per 1 mole of SiO₂.

Moles of oxygen = 0.03162 moles*2 = 0.063249 moles O

We use the Avogadro's number, 6.022×10²³ atoms/mole, to find the number of oxygen atoms.

0.063249 moles O * 6.022×10²³ atoms/mole = 3.81×10²² atoms of oxygen

6 0

3 years ago

Calculation of Original pH from Final pH after Titration A biochemist has 100 mL of a 0.10 M solution of a weak acid with a pKa

ddd [48]

Answer:

Explanation:

need it too^^

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3 years ago

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During freezing, a substance? -loses chemical energy -loses thermal energy -gains thermal energy -gains chemical energy

Sauron [17]

The process of melting a crystalline solid can be

reversed if the liquid is cooled. The change from the liquid state

to the solid state is called freezing. As the liquid cools, it loses 

thermal energy. As a result, its particles slow down and come

closer together. Attractive forces begin to trap particles and the

crystals of a solid begin to form.

"The total kinetic energy of all the particles in a sample of

matter is called thermal energy. Thermal energy, an extensive

property, depends on the number of particles in a substance as

well as the amount of energy each particle has. If either the

number of particles or the amount of energy in each particle

changes, the thermal energy of the sample changes. With identically sized

samples, the warmer substance has a greater thermal energy."

7 0

4 years ago