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3 years ago

10pt if given the correct answer I will mark you as brainliest

Chemistry

2 answers:

diamong [38]3 years ago

3 0

Answer:

Explanation:

4(Al)+3(O2)==2(Al2O3)

Also, i'm in sixth grade just took a leson on a text book so may be wrong but i'm prety sure it's the correct nswer because x(Al)+y(O2) can not make hydregen for the h2o and for b, al+so2 = al2O3 makes sense but where did the sulfer go?

Keith_Richards [23]3 years ago

3 0

Answer:

C- 1, 2 and 5

Explanation:

There are many reactions that occur in the world, and one of the more important ones are known as combustion reactions. These reactions always involve the reaction between oxygen and another element/molecule/compound. So automatically, option 2 needs to be correct, so any answer that does not have option 2 in it (B) is incorrect.

Another important factor of combustion reactions is that they give off heat, because they are exothermic reactions, however since there is no indication of energy levels, so the answer in this question cannot be determined through that method.

One important law in all reactions is the conservation of matter, so whatever atoms enter the chemical reaction, have to exit the chemical reaction (no atoms can suddenly appear without having been there originally. For example, if only oxygen and hydrogen enter a reaction, only a product with oxygen and hydrogen can exit the reaction, it is impossible to have a product containing chlorine, if no chlorine was part of the reactants). By this logic, it is impossible to have water (H₂O) as a product, if the reactants are 1 and 2 (Al and O₂), hence option A is incorrect.

The only other option left is option C, and this option is correct because the overall balanced reaction would look like such:

4Al + 3O₂ --> 2Al₂O₃

This reaction obeys the law of conservation of matter, hence, Option C is correct.

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Pure substance element I think

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What are the four points of food safety?

KatRina [158]

The four steps of food safety are:

Clean: Wash your hands and clean surfaces often
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4 years ago

A state function represent?

jeyben [28]

Answer:

a property whose value does not depend on the path taken to reach that specific value.

Explanation:

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3 years ago

Consider these elements: N, Mg, O, F, Al. a. Write the electron configuration for each element. b. Arrange the elements in order

My name is Ann [436]

Answer:

N- 1s2 2s2 2p3

Mg- 1s2 2s2 2p6 3s2

O- 1s2 2s2 2p4

F- 1s2 2s2 2p5

Al-1s2 2s2 2p6 3s2 3p1

Explanation:

Order of decreasing atomic radius

Mg,Al, N,O,F

Order of increasing ionization energy

Mg,Al, N,O,F

Reason:

Atomic radius decreases with increase in nonmetallic character. Looking at the electronic configurations, as effective nuclear charge increases, the atom becomes smaller and the attractive force between the nucleus and the outermost electrons increases. Hence, the radius of the atom decreases and ionization energy increases. Note that the addition of more orbital electrons implies addition of more nuclear charge since the both must exactly balance for the atom to remain electrically neutral. The more the electrons in the outermost shell, the higher the first ionization energy.

4 0

3 years ago

Instructions

ivann1987 [24]

Answer:

I got a 100 with this, sorry if this is not what you want just trying to help

Explanation:

1. This experiment was to find how mass and speed effect KE. This is important because if you were in a situation where you needed something to go higher, you would know to add more or less of mass/speed.

To test mass, we filled the bean bag with a certain amount of water, then dropped it. After, you recorded how high it made the bean bag go. The same with speed, but same amount in the bottle, just dropped from different heights.

My hypothesis is when you have more mass, the KE will be greater. This is also the same with speed, if it is dropped from a higher place, the bean bag will launch farther than the last time.

2. Data I collected from the lab was like my hypothesis explained. When the height of the bottle increased, it made the bean bag go higher than the last. And I tested 4 different masses, 0.125 kg, 0.250kg, 0.375kg and 0.500kg. Each time the bean bag went higher on a larger mass.

A lot of times on the speed test, the bean bag would go higher than the bottle drop point, but not every time. Also, when it was dropped from the same height each time, some results varied quite a bit, like when it was dropped from 1.28 the results were 1.14 then 1.30 1.30. Mass on the other hand was all in the same number range, only once the numbers were a bit off from each other.

3. Some formulas I used were KE= ½ mv^2 and Ht v^2/2g. The first was to calculate the kinetic energy of an object, m=mass v=speed. Second was for finding out what height I needed to drop something to reach a certain speed, Ht=Height and g= Gravitational Acceleration of 9.8 m/s^2.

I used these to figure out tables that showed relationships between different things like mass and KE or speed and height. The whole time I was doing the lab, my data was going up, when there was more mass/speed there were higher values in the table.

This means that my hypothesis at the beginning was correct, more of m/s means KE will increase proportionally because they are all linear. I found it surprising when the bean bag height went over the water bottle drop mark.

4. To conclude, my hypothesis matched my data. The data values went up when more mass or speed was added. This means if I were in a situation where I needed more kinetic energy for something, I would know to increase mass or the speed of the object giving it energy.

The reason that this hypothesis is correct is when you have more mass, you have more energy. So, when you drop let's say a baseball, it isn’t that heavy so it would only launch the bean bag so far. But a bowling ball is very heavy and has lots of energy when falling because of that, it would make the bean bag go very high.

To make this experiment better, I would use a smoother material for the lever so energy wouldn’t be lost by friction from wood rubbing together. Also, maybe a scanner or video camera to more accurately record how far the bean bag went. All of these would help the lab get more precise results, maybe they could be used in a future lab.

8 0

3 years ago