I need help pleaseee

Answer:

Krypton is the element

Symbol: Kr

Answer:

4

Explanation:

There are 4 significant figures because when there is not a decimal, then only numerical values over 0 are counted. So the numbers counted in sig figs are 2049, and none of the other 0s.

So if it was 204,900,000,000.0, then it would have 12 significant figures.

Answer:

159.808 g/mol

Answer:

159.80 g/mol

Explanation:

79.90×2=159.80g/mol

Answer:

2689.4

Explanation:

Answer:

55.845

Explanation:

yep

Answer:

i cant read it but its c and a

Explanation:

my thinking faces

Answer:

It is a water molecule.

Explanation:

A water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. Atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds.

Answer:

A water molecule is an example of a molecule created through covalent bonding. Water is made up of one oxygen atom and 2 hydrogen atoms, hence the chemical symbol H2O. A hydrogen atom is made up of 1 proton at its core and 1 electron that revolves around the core in a three-dimensional orbit.

Explanation:

Answer:

b or d

Explanation:

Answer:

The answer is B (it's reactivity)

To determine the shapes of molecules, we must become acquainted with the Lewis electron dot structure. Although the Lewis theory does not determine the shapes of molecules, it is the first step in predicting shapes of molecules. The Lewis structure helps us identify the bond pairs and the lone pairs.

Please mark BRAINLIEST.

Answer:

5 what

Explanation:

not enough information

Explanation: The additional terminology comes from the definition that, within redox processes, a reductant transfers electrons to an oxidant; hence, the reductant (reducing agent) loses electrons, so is oxidized, while the oxidant (oxidizing agent) gains electrons, so is reduced.

In an oxidation-reduction reaction, the reducing agent loses electrons and loses potential energy, Therefore, option (C) is correct.

A substance that loses its electrons in a redox reaction to other substances and gets oxidized is called a reducing agent. A reducing agent is one of the reactants which reduces the other reactant by donating the electrons to the reactant of an oxidation-reduction reaction.

If the reducing agent can't pass electrons to another reactant in a reaction, then the reduction process does not occur and the reaction cannot proceed.

In redox reactions, when an electron loses potential energy as a result of the transfer and energy is released. Electrons with more potential energy are associated with less electronegative atoms and less potential energy is associated with a more electronegative atom (such as O).

Therefore, the reducing agent loses electrons and loses potential energy in a redox reaction.

Learn more about reducing agent, here:

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Your question is incomplete, but probably the complete question was,

In an oxidation-reduction reaction, how is the reducing agent changed?

(A) it gains electrons and gains potential energy

B) it gains electrons and loses potential energy

C) it loses electrons and loses potential energy

D) it loses electrons and gains potential energy

Answer:

Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. This is because covalent bonds are strong, and diamond contains very many covalent bonds.

Graphite on the other hand has flat layers of carbon atoms held by weak van der Waal's forces which makes Graphite a weak object and easily breakable.

As graphite contains layers of carbon atoms. The layers slide over each other easily because there are only weak forces between them, making graphite slippery. These electrons can move through the graphite, carrying charge from place to place and allowing graphite to conduct electricity.One valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won't be flow of electrons That is the reason behind diamond are bad conductor electricity.These electrons are free to move between the layers in graphite, so graphite can conduct electricity.The forces between the layers in graphite are weak. This means that the layers can slide over each other.

Answer:

the position of hydrogen is controversial in periodic table because hydrogen is the only element with out neutron. it belongs to 1 st group but it is not placed there .

Explanation:

C4H9OH is the substrate, Br- is the nucleophile and H2O is the leaving group.

In an SN1 reaction, the rate limiting step is the formation of the carbocation. The carbocation is formed as water which is the leaving group departs. After the leaving group departs, the nucleophile (Br-) attacks to yield the major organic product. The protonation of the -OH group  is the first step in the reaction.

It then follows that, C4H9OH is the substrate, Br- is the nucleophile and H2O is the leaving group.

Learn more: https://brainly.com/question/22824409

Answer:

The atomic number of the element Radium (Ra) is 88. It is an alkaline earth metal. Electronic configuration of Radium (Ra) will be [Rn]7s^{2}[Rn]7s

2

It belongs to the group IIA of the periodic table. Alkaline earth metals that belong to the group IIA of the periodic table lose the valence electrons to form a +2 ion.

Therefore, Radium with an electronic configuration of [Rn]7s^{2}[Rn]7s

2

will lose the two 7s electrons to form the cation with +2 charge.

Answer:

Oxidation and Reduction occurs

Explanation:

Answer:

my answer is num:3 Hydrogen and oxygen.

Answer:

1st blank : Atoms

2nd blank : Reactants

I'm still trying to find the 3rd blank. I'll put it in comments if I find it

Explanation:

Hope this helps :)

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And have an amazing day <3

Answer:

45 grams

Explanation:

Answer:

C. Tightly packed protons and neutrons

Explanation:

It consists of two sub-atomic particle namely proton and neutron.

This dense nucleus is responsible for most of the mass of atom.

Answer:

C. tightly packed protons and neutrons

Explanation:

The nucleus of an atom is made of protons and neutrons with electrons orbiting the nucleus.

Answer:

Explanation: because more is always better

Answer:

I believe Cobalt is a Transition Metal.

Answer:

answer is transition metal

Answer:

2 Hydrogen atoms and 1 Oxygen atoms makes water

Explanation:

Hope this helps^^

Answer: Its chemical formula H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms,

Explanation: i hopes it helps :)

Explanation:

I'm sorry if this doesn't answer this correctly but solid liquid solider solid liquid/solid

Answer:

Ionic

Explanation:

Na is a metal and Br is a non-metal. Makes an ionic bond. Hope that helps

Answer:

A

Explanation:

Because it is the greatest

Answer:

Explanation:

Carbon monoxide →  Prevents oxygen from being transported in the body

Nitrogen oxides → Can cause asthma

Particulate matter → Irritates lungs, dizziness, seizures, or death

Sulfur oxides → Inflammation and irritation of the respiratory system

I hope this helps!

Answer:

The temperature is the same overtime.

Explanation:

Since the line on the graph is straight the temperature will be constant.

Answer: I think the alcohol molecules slip between the water molecules and take up that space, so you have less that you started with.

Explanation:

2. You work for an environmental company as an environmental toxicologist and have been hired to determine the contaminant present in a local resident’s pool. Create a flow chart outlining how you would detect the possible presence of Fe2+ and/or Sr2+