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Rom4ik [11]
3 years ago
6

Why do scientists use models? a. Models make some things easier to understand. b.Measurements can be made only on models. c. Mod

els help scientists visualize things they can’t see. d.Models are perfectly accurate representations of objects. e.Scientists can analyze models to make predictions.
Chemistry
2 answers:
mina [271]3 years ago
8 0
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.

So your answer would be

C) Models help scientists visualize things they can’t see.
Triss [41]3 years ago
3 0

Answer: Option (c) is the correct answer.

Explanation:

A model is a mode of representation with the help of which we can make things easy to visualize for own self and for others also.

For example, a model of boat structure of glucose will help to visualize how the atoms are bonding together and repelling due to difference in their size.

Hence, scientists also get benefited with the help of models as they also get to know how they need to explain or correct things in their research.

Thus, we can conclude that scientists use models because Models help scientists visualize things they can’t see.

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Nucleic acids are hydrocarbons that also contain nitrogen, phosphorus and oxygen elements. 
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3 years ago
According to periodic trend, which of the following most likely has the highest ionization energy? Be B Ne O
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Answer:

Ne

Explanation:

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Answer:

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Explanation:

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3 years ago
A solution containing 20.0 g of sodium sulfite reacts with 7.0 ml of phosphoric acid. The concentration of the acid solution is
stiv31 [10]

a) The mass of the excess reactant remaining at completion is 7.36 grams.

b) mass of water produced is 3.51 grams.

c) moles of sodium phosphate produced is 0.0186.

d) grams of sulphur dioxide produced is 12.49 grams.

Explanation:

Data given:

mass of sodium sulphite = 20 grams

volume of phosphoric acid = 7 ml

concentration of the phosphoric acid is = 1.83 grams/ml

mass of excess reactant =?

grams of water produced =?

moles of sodium phosphate =?

grams of sulphur dioxide =?

balance equation for the reaction:

2H_{3}PO^{4}  +  3 Na_{2}SO_{3} ⇒ 2Na_{3} PO_{4}  +3 SO_{2} +3 H_{2}O

Now the number of moles will be calculated by using the formula:

molarity = \frac{number of moles}{volume of solution}

For phosphoric acid number of moles (atomic mass of H3PO4 = 97.99 grams/mole), mass is 1 ml has 1.83 grams so 7 ml wil have 12.81 grams

number of moles = \frac{mass}{atomic mass of 1 mole}

                           =\frac{12.81}{97.99}

                             = 0.13 moles of H3PO4 in 7 ml

number of moles of sodium sulphite  (atomic mass = 126.04 grams/mole)

 = \frac{20}{126.04}

= 0.15 moles

from the stoichiometry:

limiting reagent is the one which yield low amount of product.

3 moles of phosphoric acid gave 2 moles of Na3PO4

0.13 moles give x moles

\frac{2}{3} = \frac{x}{0.13}

3x = 0.26

x = 0.086 moles of Na3PO4

2 moles of phosphoric acid gave 3 moles of sulphur dioxide and 3 moles of water

0.13 moles of phosphoric acid will give x moles of water and sulphur dioxide.

\frac{3}{2} = \frac{x}{0.13}   (SO2)   and \frac{3}{2} =\frac{x}{0.13}

so 0.195 moles of water and 0.195 moles of SO2 is formed.

Now the second reactant:

3 moles of 3 Na_{2}SO_{3} gave 2 moles of Na3PO4

So, 0.15 moles will give

\frac{2}{3} = \frac{x}{0.15}

x = 0.1 moles of Na3P04

3 moles  Na_{2}SO_{3}  gives 3 mole of water and SO2

so 0.15 mole of water and SO2 formed

so the limiting reagent is H3P04

mass of the products:

mass = number of moles x atomic mass

b) mass of water = 0.195 x 18

                         = 3.51 grams

c) mass of SO2  = 0.195 x 64.06

                       = 12.49 grams

d ) mass of sodium phosphate = 0.086 x 163.94

                                                 = 14.09 grams

a) mass of excess reactant

Sodium sulphite is excess reactant,

so we had started with 0.15 sodium sulphite

ratio of excess and limiting reagent as moles of sodium phosphate from sodium sulphite is 0.1 and from H3P04 is 0.086 moles so excess is

0.1 x 126.04

= 12.64 grams

we started with 20 grams and used 12.64 grams

excess reagent = 20 - 12.64

                          = 7.36 grams is the excess reagent.

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Why can a liquid take the shape of the bottom of its container?
VLD [36.1K]

Answer: Option (a) is the correct answer.

Explanation:

In a liquid state, particles are held less tightly as compared to a solid state. So, they have some kinetic energy due to which they collide with each other.

As a result, particles of a liquid are able to slide past each other. Hence, they are able to acquire the shape and volume of a container in which they are poured.

Whereas when particles of a liquid can break free from one another and spread out then it means a substance is present in a gaseous state.

When the particles of a liquid can vibrate within their fixed locations then it means the substance is present in a solid state. And, they have definite shape and volume.

Thus, we can conclude that a liquid take the shape of the bottom of its container as the particles of a liquid can flow around one another to new locations.

8 0
4 years ago
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