PLEASE HELP!
The element (AI) is outlined in red on the periodic table.
Which period number is aluminum?
Which group number is aluminum in?

Answer:

253.02 kJ.

Explanation:

The balanced reaction for the decomposition of baking soda is

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

We can find the heat of reaction by using the Hess' Law. This is done by using this formula:

∑(Hf,products) -∑(Hf,reactants) = Heat of reaction

where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:

NaHCO3: -947.68 kJ/mol

Na2CO3: -1130.94 kJ/mol

CO2: -393.51 kJ/mol

H2O: -241.8 kJ/mol

Applying Hess' Law:

[1(-1130.94) + 1(-241.82)] + 1(-393.51)] - [2(-947.68)] = 129.09 kJ

Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ.

Answer:

Option B

Explanation:

A structural isomer of an organic compound refers to a compound that has the same molecular formula, but a different arrangement of atoms in the carbon chain.

Butanol has the molecular formula C4H9OH.  We can now explore the options to see if any of them have the same molecular formula.

Option A has no oxygen in it, so we can rule it out

Option B has 4 carbon atoms, 9 hydrogen atoms and 1 oxygen atom as well as single Chain branches. This makes it the structural isomer of Butanol ( C4H9OH).

Option C has only 3 carbon atoms which rules it out as being an isomer.

Answer:

option b on edge

Explanation:

Answer:

bone loss and muscle deterioration

Explanation:

this helps the body keep thriving and bones strong and muscles in tact

Answer:

Running changes your body by burning body fat and building muscles. Expect to lose fat at the top of your thighs, build stomach muscles of steal and a butt to die for the weight. ... Running increasing your strength and endurance plus interval training can boost your metabolism.

Explanation:

Answer:

Frequency, f = 4 Hz

Explanation:

We have,

Number of waves passing a fixed point are 20

Time, t = 5 seconds

It is required to find the frequency of the wave. Frequency of a wave is defined as the number of waves passing through a point per second. Its mathematical form is given by :

[tex]f=\dfrac{n}{t}\\\\f=\dfrac{20}{5}\\\\f=4\ Hz[/tex]

So, the frequency of the wave is 4 Hz.

Answer: I think that the answer was False.

Answer: false

Explanation:

Gravitational, electrostatic, strong nuclear, and weak nuclear

Answer:

troposphere, the stratosphere, the mesosphere and the thermosphere

Explanation:

The atmosphere of the earth is composed of layers based on the temperature. There are four layers in the atmosphere. They are ordered as troposphere, stratosphere, mesosphere and the thermosphere.

The atmosphere of the earth is layered and each layer of the atmosphere has its own characteristics. The weather processes occur in the lower layers of the atmosphere. The four important layers are troposphere, stratosphere, mesosphere and the thermosphere.

The lowest layer of the atmosphere where we live is called the troposphere. It is this layer which contains weather, clouds, rain and snow. The layer above troposphere is called the stratosphere. It is in this part where ozone is found.

The mesosphere is found above stratosphere. Here the temperature is found to be less and reaches a minimum of about -90°C. The thermosphere lies above the mesopause where the temperature will be very high.

Thus the correct order is troposphere, stratosphere, mesosphere and the thermosphere.

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Answer:

I think they are beneficial for the life of those symbiotic organisms that require yes or yes from another to be able to live.

Although an ecosystem could not be carried out if only this relationship would occur, since symbiotic relationships we have an organism where it needs another to live and even removes the necessary nutrients for it, that is why the chain should continue with other types of relationships .

Explanation:

The symbiosis is defined as "Intimate association of organisms of different species to mutually benefit in their vital development" that is why adequate coexistence between these living organisms is needed, otherwise this phenomenon would not occur.

A very good example of the symbiosis is: Bees and plants where the bee is the pollinating agent of the plant so that it continues to reproduce and the plant is the bee's food source.

Therefore I believe that the development of this type of relationship is VITAL, and very fundamental, otherwise I do not know if an ecosystem or a balanced ecosystem could be carried out.

Answer:

100% medium

Explanation:

Since you got all Hh which equals medium it means all are going to be that.

Answer:

100% med

Explanation:

Answer:

  Chemicals in fertilizers run off into water and cause algae blooms

Explanation:

Of the answer choices, the ones that have to do with commercial land use are the ones discussing fertilizers. Some commercial land is dedicated to lawn, but commercial farms are a much larger portion of commercial land use. The appropriate choice is, "Chemicals in fertilizers run off into water and cause algae blooms."

Answer:The number of electrons in an atom's outermost valence shell governs its bonding behavior. Therefore, elements whose atoms can have the same number of valence electrons are grouped together in the periodic table of the elements

Explanation: B

it's D because the are located in the outer most shell, they are responsible for the chemical reaction and determine if they conduct electricity or not, you can look it up if you don't believe me

Answer:

1.204 * 10^24

Explanation:

Answer:

yes

Explanation:

Answer:

Simple, the heat of it causes the atoms to move more quickly, which produces and uses energy.

Explanation:

Answer:

By heating in a closed system.

Liquids can reach higher temperatures in a pressure cooker than in an unsealed pot by  the application of heat to the pressure cooker.

A pressure cooker is usually tightly closed with no surrounding air interference which helps to maintain the temperature and increase in the elastic collision of particles. The increase in particle collision helps the liquid in the pot to attain a higher temperature.

However, heating in an unsealed pot makes the interference of surrounding air with it very possible which will definitely slow down the particle collisions and reduce the temperature and pressure due to the both of them being directly proportional to each other.

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Answer:

It cites valid data

Explanation:

It clearly shouldn't cite opinions cause then that isn't science. Every thing else seems like an okay answer but it cites valid data is the best answer since the data should be valid no matter what.

Answer:  hydrophilic head and hydrophobic tails

Explanation:

A phospholipid consists of glycerol molecule, 2 fatty acids, and 1 phosphate group that is replaced by alcohol. In the phosphate group the polar head is negatively charged and hydrophilic in nature, whereas the fatty acid chain is nonpolar tails, that are hydrophobic. The tails are hydrophobic which face the inside and away from water.

Answer:

hydrophilic head and hydrophobic tails

Answer:

Calcium

Explanation:

The ability to be hammered into sheets is known in chemistry as malleability. One of the properties of metals is that metals are malleable. All metals thus have a common property that they can be hammered into sheets used in diverse applications. We can see diverse thin sheets of metals around us used to diverse purposes. This is a vary important property of metals that amplify its importance in materials science.

Of all the options listed, only calcium is a metal. Since nonmetals and metalloids can not be hammered into sheets, nitrogen, silicon and fluorine can not be hammered into sheets. Calcium, being a metal can be hammered into thin sheets.

Question:

Options

1) Nitrogen

2) Silicon

3) Fluorine

4) Calcium

Answer:

The correct option is;

4) Calcium

Explanation:

We analyze each of the elements as follows;

Nitrogen is a gas at room temperature, therefore it cannot be hammered into sheets

Silicon is a brittle non-metal, that breaks when struck

Fluorine is a gas at room temperature, therefore it cannot be hammered into sheets

Calcium is a soft, solid silvery-white, metallic element that is ductile, hence, it can be beaten into very thin sheets.

Answer:

you would be trapped in the gravitational pull of a black hole

Explanation:

there is a black hole in the center of the galacy

Answer:

Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize ... Investigate whether changing the volume or diluting with water affects the pH. ... Original Sim and Translations ... Lab, Chemistry.

Answer:

cylinder A has a higher density then cylinder B or more accurately the liquid in cylinder A is denser then the liquid in the second tube.

Explanation:

"Denser" simply means more matter is contained in the same space for example say you fill a tank with helium and another tank with water. Although they are the same size one will weigh much more because their is more particles or "stuff" inside the same area this can be because of a few things one it can be because the atoms or elements that compose the substance are heavier containing more electrons and protons in their orbit. or the molecular structure is more compact like a chicken wire fence has more wire in it then a barbed wire wire fence covering the same area because of the grid of wire in the middle.

Answer:

A is denser.

Explanation:

Answer:

Explanation:

It is also known to be a non-conductive material due to its volatile content. The coatings and inks industries prefer grades of carbon black that are acid-oxidized. Acid is sprayed in high-temperature dryers during the manufacturing process to change the inherent surface chemistry of the black.

Answer:

C) electrons are transferred from one atom to another in both types of bonds

Explanation:

Answer:

C) periodic table

Explanation:

Answer:

c

Explanation:

cmon its so obvious

The answer is D

Explanation: A RED FLOWER WITH ONE PART COLORED YELLOW

Answer:

D.a red flower with one part colored yellow

Explanation:

edg2020

Answer:

Static Electricity! :)

Explanation:

Answer: “We live on a hunk of rock and metal that circles a humdrum star that is one of 400 billion other stars that make up the Milky Way Galaxy which is one of billions of other galaxies which make up a universe which may be one of a very large number, perhaps an infinite number, of other universes. That is a perspective on human life and our culture that is well worth pondering.”

― Carl Saga

Is this it mate?

Answer:

Option C is correct

Explanation:

Entropy is defined as the randomness in a system. In nature, a system tends to have high entropy. The higher the entropy , the spontaneous the reactions would be. As a system loses energy, it becomes more ordered and less random. Hence, as the reaction proceeds in a system, the system  has higher energy/entropy and less order.  

Hence, option c is correct

Answer:

D. Its temperature will remain 100 C until all the vapours condenses

Explanation:

Heat absorbed by a substance to change the state of matter is known as latent heat. This heat is utilized to break the bonds between atoms of the substance so that they can undergo phase change.

So, when water boils at 100 degree Celsius then temperature will remain constant unless and until all the water changes into vapor. As it is the latent heat that breaks the bonds between hydrogen and oxygen atoms of water so that liquid state can change into gaseous state.

Since latent heat is a hidden heat, that is why, it does not get reflected and there is no change in temperature due to it.

Thus, we can conclude that it is true that temperature will remain at 100°C until all the vapor condenses for a sample of water vapor at 101°C as it cools.

Answer:

Aspirin, 9 carbon atoms

Explanation:

(would really appreciate the brainliest)

Aspirin is a compound which has most carbon atoms that is it has 9 carbon atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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