CHEMISTRY MIDDLE SCHOOL

In an oxidation-reduction reaction, the number of electrons lost is(1) equal to the number of electrons gained
(2) equal to the number of protons gained
(3) less than the number of electrons gained
(4) less than the number or protons gained

Answers

Answer 1
Answer: (1) equal to the number of electrons gained
(2) equal to the number of protons gained
(3) less than the number of electrons gained
(4) less than the number or protons gained

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I need help please on these questions, i can not do the model, so please help me, if you could give me an example that would be great 1. Which of the stages of the water cycle were you able to observe in your model?2. What is the energy source in your model and what does it represent?3. Did you observe evapotranspiration in your model? If yes, where? If no, howcould you have demonstrated it?4. Where in your model does condensation occur more rapidly? How do you know?5. Do you think your model accurately demonstrates the water cycle? Why or whynot? If you were to redesign your model, how would you refine it?5 point for each.

Why does some friction occur with seemingly smooth surfaces?

Answers

Even surfaces that seem smooth have irregular bumps that you could see with a microscope, so friction occurs even with smooth-looking objects.

How could you tell if a sample of matter is a element

Answers

Terms of good sample

In general, a good sample is which can represent as much as possible the characteristics of the population. In the language of measurement, meaning that the sample must be valid, which can measure something that should be measured. A valid sample is determined by two considerations.

First: The accuracy or precision, the degree of absence of "bias" (error) in the sample. In other words, the less the error rate is in the sample, the more accurate the sample. Benchmarks for "bias" or error is population.

Cooper and Emory (1995) states that "there is no systematic variance"that means is there is no diversity of measurement due to the influenceof known or unknown, which led to scores tend to lead to a certainpoint.

Second: Precision. The second criterion is to have a good sample estimate of the level of precision. Precision refers to the question of how close we are to estimate population characteristics. There has never been a sample that can fully represent the characteristics of the population. Therefore,in each sampling always attached keasalahan-error, which is known as"sampling error" Precision is measured by standard deviation (standarderror). Thesmaller the difference between the standard deviation obtained from thesample (S) with a standard deviation of the population (s), the higherthe level of precision. Thoughnot always, the level of precision may be increased by adding thenumber of samples, the fault may be reduced if the number of samplesplus (Kerlinger, 1973).

PLEASE HELP!!!A vacuum flask keeps its contents warmer or cooler than the surrounding environment for a length of
time. It consists of two flasks, one inside the other, that connect at the neck. The space between the two
flasks is completely empty of air.

Q-Why does the design of the vacuum flask minimize heat transfer by conduction?

A)- One flask is smaller than the other flask.
B)- One flask is more reflective than the other flask.
C)- There is no air between the two flasks.
D)- The two flasks do not touch each other, except at the neck.

Answers

Answer is: C) There is no air between the two flasks.

Heat in this example can transfer throw thermal conduction.

Because there are no mo molecules to transfer heat, there is no conduction.

Thermal conduction is the transfer of heat through physical contact. Thermal conduction is the transfer of heat by microscopic collisions of particles. Heat spontaneously flows from a hotter to a colder body.

The process of heat conduction depends on four basic factors: the temperature gradient, the cross section of the materials involved, their path length and the properties of those materials.

Because there are no mo molecules to transfer heat, there is no conduction.
C. Heat could easily travel through the molecules in the air and escape/enter the flask. Removing the air slows down the heat transfer. 

A mole or fraction of a mole represents a ____ number of atoms or molecules.A : specific

B : nonspecific

Answers

Answer:

specific

Explanation:

a mole represents the amount of grams it takes to have avogadro's number

Answer:

A is your answer

Explanation:

What values do we plot on the yaxis of a graph?A. The dependent variable
B. The independent variable
C. The linear values
D. The inverse values

Answers

Answer:the answer is a

Explanation:I’m 90% positive.

What two categorical ways of thinking about matter are discussed in the passage?

Answers

The two categorical ways of thinking about the matter are discussed in the passage are physical and chemical.

The matter has been the unit, from which everything is made up of. The passage asks about the matter has been the part of each and every physical and chemical reaction.

All the matter has an atom as its smallest building block. The elements listed in the periodic table also matter. The smallest and the biggest entity has consisted of matter.

The physical categorial way of thinking of matter involves the properties that can be sensed by the five human senses. The things that can be seen, heard, tasted, touched, and felt are all matters.

The chemical properties of the matter that result in the formation of a new matter that is irreversible in nature.

For more information about the matter, refer to the link:

brainly.com/question/24771841

Answer:

There's no passage but I can say that matter are that ''thing'' which extend through all Universe, matter is everything. It can be seen or felt as liquid, gas or solid. This changes of its state depend on the amount of energy that is involved.

So, here is used categorical thinking because is a abstract concept that is hard to understand sometimes. It's abstract when we say that matter is all, not  just what we see, but even what we don't see like ''Dark Matter'', which is the majority in the Universe.
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