please help with this!

Answer:

Every element in a given group has the same number of valence electrons. For elements in the main groups (1-2, and 13-18), the number of valence electrons increases when moving from left to right along any period (row). The noble gases contain a full valence electron shell, which consists of eight electrons.

Explanation:

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Answer:

Valence Electrons

Explanation:

Say you are looking at a neutrally charged carbon atom, it has 6 electrons. The first electron shell can hold 2 electrons. The next can hold 8, the next can hold 8 and the next can hold ten and so on... Well in the Carbon atom case, it has 6 electrons, 6-2 is 4, so the carbon atom at 4 valence electrons, which actually helps it in making organic molecules, which in turn also helps make something you might have heard of before, organisms, the best example being, humans

Answer:

Generally, interactions with air, water and living organisms cause the weathering of rocks. Although there are two major types of weathering processes, physical weathering and chemical weathering cannot be separated, and they often work together at different rates to break large rocks into smaller pieces over time.

Explanation:

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The heat associated with the reaction (qrxn, in KJ) when 4.85 grams of H₂ is produced is +693.55 KJ

2H₂O → 2H₂ + O₂  ΔH°rxn = +572 KJ

Molar mass of H₂ = 2 × 1 = 2 g/mol

Mass of H₂ from the balanced equation = 2 × 2 = 4 g

SUMMARY

From the balanced equation above,

When 4 g of H₂ is produced, 572 KJ of heat where needed.

From the balanced equation above,

When 4 g of H₂ is produced, 572 KJ of heat where needed.

Therefore,

When 4.85 g of H₂ is produced = (4.85 × 572) / 4 = +693.55 KJ of heat will be required.

Thus, +693.55 KJ of heat is required for the reaction.

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Answer:

1

Explanation:

Answer:

can be SI or also know miles per second.

Answer:

Groups

Explanation:

The groups determine if the atom is reactive or not, take the Noble Gases for example, they are very very very unreactive.

Answer:

the people injected with the drug are the variable group while the people injected with the harmless solution are the control group

The product of this reaction is PH3. All of the atoms in PH3 have a stable configuration.

According to the octet rule, atoms are stable when they have two or eight electrons around their outermost shell. A stable configuration is one in which the outermost shell is fully filled with eight electrons.

The reason behind chemical combination is to enable atoms attain this stable configuration. If we look at the compound, PH3, we will notice that phosphorus has eight electrons around its outermost shell while each hydrogen atom has two electrons around its outermost shell hence  all of the atoms have a stable configuration.

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Answer:ph3

Explanation:yeah

Answer:

green house effect

Explanation:

it works like a green house

movement of water from high potential to low potential

Answer:

I believe it is D sorry if I am wrong

Explanation:

Answer:

D.

Explanation:

Answer:

Speed can be thought of as the rate at which an object coverse distance

B) Reate distance

Answer:

4

Explanation:

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K(s) + 2HCl(aq) ----> 2KCl (aq) +H2(g) is an example of single replacement reactions.

A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound.

Single-replacement reactions always involve two pure elements and one aqueous compound/solution. In the above reaction, the A and C would be pure elements.

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.

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Answer:

See below

Explanation:

Hello there!

Electronegativity is the atom's tendency to attract electrons in a chemical bond

There are two trends to electronegativity:

Looking at a period table, Sb, Sn, Te, and I are all in the same period, so we'll need to decide which element has the highest electronegativity based on the group.

As I belongs to group 7A, the group that is the farthest right based off of the options given, I has the highest electronegativity

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Answer:

water will boil at 100 celcius or 212 farenheit

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Answer:

At 100° C or 373.15K

Explanation:

Answer:

he combustion of ethane (C2H6) is represented by the equation: 2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l). In this reaction: (a) the rate of consumption of ethane ...

Explanation:

he combustion of ethane (C2H6) is represented by the equation: 2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l). In this reaction: (a) the rate of consumption of ethane ...

Answer: One methane molecule, CH4, contains one carbon atom and four hydrogen atoms.

Explanation:

Answer:

24

Explanation:

The average size of most ponds is 10′ x 15′ (roughly 150 square feet) with the deepest point being 24″. If you have underwater shelves for plants they usually go 12″ down.

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Answer:

ajajbshdbrbxjdnd djxbxbx

Explanation:

hdjdndjsosnbdjdkx dkdmdbdjd

Answer:

13798.18 J

Explanation:

3301 cal * 4.18 J/1 cal = 13798.18

Recall that (1 cal = 4.18 J)

Answer:

10.793 kilometres per hour

Answer:

Explanation:

Why +4?

Answer:

a chemical that burns stuff

Explanation:

acid is something that burns it like that it goes thru it

Answer:

Acid is a sour material which have pH value less than. 7

Answer:

Firstly, We have to convert it in the Miles formula...

No. of moles = Mass given/Molar Mass

So, the final answer be come

Answer:

yields

Explanation:

I just did that quiz on k12 8th grade

Answer:

D

Explanation:

TOOK TEST ON K12

Explanation:

Not only did outermost electron determine the valence electron, but also periodic table. whatever group they fall into in periodic table each valence electrons present in a particular atom e.g K and Ca belong to group 1 and 2 respectively and k has 1 and Ca have 2 in each outermost electron

Answer:

thrieidjnfkoeow wlfofj3v3koeud3838rbcjr9r8enebbfjfddndndnd

type this code in command prompt and your computer will get crashed

Answer:

It is melting chocolate and freezing water.

Explanation:

If your melting melting chocolate it would turn into a liquid and if you freeze

water then you are turning liquid to a solid.

Melting chocolate and freezing water are the examples of phase change.

A phase change is a change in the states of matter. For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation.

A phase transition is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas.

There are eight thermal processes through which matter can attain phase change. They are melting, freezing, evaporation, condensation, sublimation, deposition, ionization, and recombination.

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Answer:

2.567 litres

Explanation:

I dont have a proper explanation sorry

Based on the nature of the types of chemical bonding, the example illustrates covalent bonding because electrons are shared between the carbon and hydrogen atoms.

Chemical bonding or combination occurs when atoms of elements combine to form products.

Chemical bonding can either be;

Covalent bonding involves a sharing of electrons by the atoms of elements involved.

Since the example shows electrons being shared between carbon and hydrogen atoms, the example illustrates a covalent bonding because electrons are shared between the atoms.

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