help on this question please?

Answer:

activity series is a list of substances ranked in order of relative reactivity.

For example, magnesium metal can displace hydrogen ions from solution. So magnesium is more reactive than hydrogen:

Mg(s) + 2H⁺(aq) → H₂(g) + Mg²⁺(aq)

Zinc metal can also displace hydrogen ions from solution:

Zn(s) + 2H⁺(aq) → H₂(g) + Zn²⁺(aq)

so zinc is also more active than hydrogen.

But magnesium metal can displace zinc ions from solution:

Mg(s) + Zn²⁺(aq) → Zn(s) + Mg²⁺(aq)

so magnesium is more active than zinc.

The activity series including these elements would be Mg > Zn > H.

Chemists have built up a complete activity series in a similar way.

The most active metals are at the top of the table; the least active are at the bottom.

Any metal that is higher in the series will displace a metal that is below it in a

The knowledge of the activity series in choosing which metal to build things with because; it provides a basis for determining which metal ion is able to displace the other upon chemical interaction.

The choice of building material is a very important design consideration.

This variation is carefully quantified by the position of metals on the activity series.

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Answer: Oxygen, Water and Trees

Explanation: No other planet in the solar system has an atmosphere of oxygen or liquid water or trees on them.

Answer:

its aragon , so letter b is right

Explanation:

Answer:

it becomes water of it liqud

Explanation:

il explain in comment if you brainly me

Answer:

As you can see sodium = ionic and covalent bonds aka NA 2

and CO 3 also has those two bonds the other answers dont have both numbers (bonds) Na2 and CO3 is the only answer choice that has these bonds in simpler terms ( only answer with 2 numbers)

Explanation:

Answer:

yes it chemical to electrical to radiant energy

Explanation:

correct

Answer: 57.C

Explanation: simple subtraction

Answer:

D po

Explanation:

Sana nakatutulong

#Carry on learning

Pa brainliest po

Answer:

Element X has valency 2 while Y Valency 2, element Y has high tendency of gaining electrons for its stability thus the compound formed will be B

elements X is positively charged while Y will be negatively charged

The groups or the families in the periodic table are denoted by the vertical column. Element in group 2 and 7 forms compound with ions X²⁺ and Y⁻. Thus, option B is correct.

A group of the periodic table is also called a family that has the elements placed togther with the same number of the valence electron. Group II has two valence electrons and VII has seven valence electrons in the outer shells.

The two valence electrons of the atom can be donated easily compared to acquiring the six electrons to complete the octet and stability. Similarly, the seven valence electrons are hard to donate but can accept one electron to achieve satbility.

The group II element X will donate its two electrons to acquire a +2 charge, whereas group VII element Y will accept one electron and acquire a -1 charge.

Therefore, option B.  X²⁺ and Y⁻ presents the ions of the compound.

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Answer:

its A i put B and got it wrong

Explanation:

Answer:

Starch is a soft, white, tasteless powder that is insoluble in cold water, alcohol, or other solvents.

glycogen is a substance deposited in bodily tissues as a store of carbohydrates. It is a polysaccharide which forms glucose on hydrolysis.

Cellulose is a molecule, consisting of hundreds and sometimes even thousands of carbon, hydrogen and oxygen atoms.

Answer:

my family will visit our grandparents

Answer:

my family also visit thier grandmother's

Answer:

ACID RAIN

Explanation:

duh

Answer:

The convection zone :)

Answer:

D

Explanation:

Solvent is the material that is dissolving another material​. Thus, option D is correct.

A solvent is a substance that dissolves another substance to form a solution. The substance that is being dissolved is called the solute, and the substance that is doing the dissolving is called the solvent. The solute is usually present in a smaller amount than the solvent, and it is the solvent that determines the physical properties of the solution, such as its density, viscosity, and boiling point.

For example, when salt is dissolved in water, the salt is the solute and the water is the solvent. The water molecules surround the salt molecules and break them apart, so that the salt ions are free to move around in the solution. The solution is then a homogeneous mixture of salt ions and water molecules.

Thus, option D is correct.

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Answer: the answer should be A the first one

plzz give me brainliest

Answer: The nuclear symbol of an isotope indicates the number of protons and neutrons in an atom of the element. It does not indicate the number of electrons. The number of neutrons is not stated. Instead, you have to figure it out based on the number of protons or atomic number.

Explanation:

brain me

Answer:

K₂0

Explanation:

Answer:

Free electrons

Explanation:

Graphite conducts heat in a similar way to metals because it contains free electrons.

Conductivity is arised from the delocalization of free electrons. Metals are electron rich and conduct thermally and electrically. Graphite conducts heat in a similar way because it contain delocalized electrons.

Graphite is an allotrope of carbon as diamond and fullerenes. Graphite exhibits a  layered  helical structures in which the carbon atoms are arranged in a hexagonal fashion.

Substances conduct electricity and heat when they are rich in electrons and are mobile to pass through it. Metals are electropositive and they contains extra electrons which can be delocalized between orbitals or energy levels.

This delocalization of electrons results in an a thermal or electrical current in the substance. Carbon is in sp2 hybridisation in graphite. Where, the electrons can transit from one layer to the other in the layered structure.

Therefore, the presence of delocalized electrons make graphite conducting.

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answer:

B

Why:

Because when heated up, the particles vibrate from the heat and keep on vibrating.

at point b of the diagram, the energy is gone to breaking bonds of the (let's assume) solid.

So there is no change in temperature.

I hope this helps please let me know if you need me to explain more.

When temperature is changing with respect to the time in the given graph, then substance B was undergoing a change of state.

When any substance converts from one form of matter to the other form, then this phenomenon is known as change of state.

In the given figure a graph represents the change in temperature of substances A, B, C and D with respect to the time. Temperature of the substances A, C & D keep continuous changing with respect to the time. But substance B shows change in state because it absorbs the heat to convert in another state by breaking old bonds and making new bonds and showing showing no change in temperature.

Hence, substance B was undergoing a change of state.

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Answer:

Mine occured right in between the 2 cabbages. That's where the transfer happened.

Explanation:

If you just draw a little star or something or an arrow and just say this is where the transformation happened they will mark that correct.

I did it once!! and it worked!! now I have an  A in science!!!

Answer:

Mark me as Brainliest please

Explanation:

Compression vs Tension

Tension and compression are two concepts discussed in physics. Tension is a force, while compression is a phenomenon. Both these concepts play important parts in fields such as mechanical systems, automobile engineering, heat engines, material science, pendulums and various other fields. It is vital to have a proper understanding in tension and compression in order to excel in such fields. In this article, we are going to discuss what compression and tension are, their definitions, applications of compression and tension, the similarities between compression and tension and finally, the difference between compression and tension.

Answer:circular heliocentric orbits.

Explanation:

Answer:

Lithium has 1 valence electron, Sulfur has 6

A is oxidized, B is reduced

A is reducing agent, B is oxidizing agent

Explanation:

when an atom loses electrons, it is oxidized

when an atom gains electrons, it is reduced (almost think of when you add a negative number to a positive number, the positive number gets smaller or is reduced)

Answer:c

Explanation:

Answer:

mass an volume or hardines be density

An additional 10 ml of water is evaporated from the solution because there is excess water in the solution which prevents the formation of crystals.

Crystallization is defined as a type of separation technique that is used for the separation of two salts with different solubilities

Alum, which is aluminum potassium sulfate, is a chemical compound that can be used for purification of water.

When dissolved in water it can be recovered through a process called recrystallization.

Recrystallization occurs when a solution of salt is concentrated by boiling off some of the solvents

When the quantity of the solvent can no longer hold all the salt, crystals will be formed.

Therefore, if crystals do not form upon cooling the solution of alum, the solution should still be heated to evaporate excess water in the solution which prevents the formation of crystals.

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Additional 10 ml of water is evaporated from the solution in order to formed alum.

If crystals do not form upon cooling the solution of alum, an additional 10 ml of water is evaporated from the solution because specific amount of water is needed for the formation of alum crystals. Alum crystal has 12 molecules of water so lower from 12 molecules of water or higher can leads to non-formation of alum crystal.

In the solution water is present in a very large amount which can evaporated with the help of heating until 12 molecules of water are present in the composition of alum so we can conclude that additional 10 ml of water is evaporated from the solution in order to produce alum.

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Answer:

Explanation: