Help on this question please

Answer:

Explanation:

Atoms are the thing that make up molecules and compounds. Molecules contain two or more atoms and are held together by covalent bonds

Answer:

87 (whatever unit its using)

Answer:

5

Explanation:

The elements contained in this equation are:

Na

Cl

H

S

O

Answer:

oxygen, carbondioxide

carbondioxide, oxygen

Answer:

3rd image

Explanation:

Answer:

iron .. titanium.. nickel....aluminum... sulfur... and calcium

Answer:

5.52

Explanation:

2.76 10^-3 M = 2.76mM

2.76mM*2L= 5.52mmol

While he was researching and writing that book in the 1860s, Mendeleyev made the discovery that led to his most famous achievement. He noticed certain recurring patterns between different groups of elements and, using existing knowledge of the elements' chemical and physical properties, he was able to make further connections. He systematically arranged the dozens of known elements by atomic weight in a grid-like diagram; following this system, he could even predict the qualities of still-unknown elements. In 1869, Mendeleyev formally presented his discovery of the periodic law to the Russian Chemical Society.

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Answer:

The nucleus of atom is composed of two subatomic particles that each have charges.

Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.

The forces of attraction that exists between positive metal ions and their surrounding valence electrons is called: metallic bonds.

A chemical bond can be defined as the forces of attraction that exists between ions, crystals, atoms or molecules and they are mainly responsible for the formation of all chemical compounds.

In Chemistry, there are different types of chemical bonds and these are:

A metallic bond can be defined as the forces of attraction that exists between positive metal ions and their surrounding valence electrons.

This ultimately implies that, metallic bond are peculiar to positively charged metals but not negatively charged metals or non-metals.

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Answer:

Explanation:

Answer:

C. Al

Explanation:

2Al+ 3H2SO4(l)------> Al2(SO4)3+ 3H2

Answer:

500 m 495 g  its 900 mL

Explanation:

Answer:

The alkali metals are the highly electropositive metals. Highly electropositive metals cannot be extraction carbon reduction process, because these metals do not react with carbon

Explanation:

El valor positivo de [tex]m[/tex] para que la ecuación [tex]x\cdot (x+2) = 4\cdot m \cdot x - 8[/tex] tenga una raíz que sea el doble de la otra es 2.

De acuerdo con el enunciado de esta pregunta, debemos encontrar un valor de [tex]m[/tex] a partir del siguiente sistema de ecuaciones:

[tex]r\cdot (r+2) = 4\cdot m \cdot r -8[/tex] (1)

[tex]2\cdot r \cdot (2\cdot r + 2) = 4\cdot m \cdot (2\cdot r) - 8[/tex] (2)

Ahora simplificamos el sistema de ecuaciones:

[tex]r^{2}+2\cdot r = 4\cdot m\cdot r - 8[/tex] (1b)

[tex]4\cdot r^{2}+4\cdot r =8\cdot m\cdot r - 8[/tex] (2b)

Despejamos [tex]m[/tex] en cada expresión, lo eliminamos y resolvemos el polinomio resultante:

[tex]\frac{r^{2}+2\cdot r + 8}{4\cdot r} = \frac{4\cdot r^{2}+4\cdot r +8}{8\cdot r}[/tex]

[tex]r^{2}+2\cdot r + 8 = 2\cdot r^{2}+2\cdot r +4[/tex]

[tex]r^{2}-4 = 0[/tex]

[tex]r^{2} = 4[/tex]

[tex]r = \pm 2[/tex]

Finalmente, determinamos el valor de [tex]m[/tex], que al ser positivo, debemos utilizar [tex]r = 2[/tex]:

[tex]m = \frac{2^{2}+2\cdot 2 + 8}{4\cdot 2}[/tex]

[tex]m = 2[/tex]

El valor positivo de [tex]m[/tex] para que la ecuación [tex]x\cdot (x+2) = 4\cdot m \cdot x - 8[/tex] tenga una raíz que sea el doble de la otra es 2.

Invitamos cordialmente a ver esta pregunta sobre polinomios de segundo orden: https://brainly.com/question/15792293

Answer:

see explanation

Explanation:

How is the relatively high melting point of sodium chloride related to its structure at the atomic scale? Observe sodium chloride crystals with a hand lens. Use your observations and the model of sodium chloride to support your claim.

Unlike the raltively low melting point of water (100 °C), NaCl has a much higher melting point (801 °C),.

Theater molecules in ice are held together by hydrogen bonds, which are relatively weak.

The ions in NaCl are held together by  ionic bonds, whose electrostatic ,force is much greater.

The crystal structure makes the force even greater.

imagine a chloride ionin a NaCl crystal.

It has Na ions in front, behind, to the left, to the right, above and below.

Likewise the Na ion has Cl ions in front, behind, to the left, to the right, above and below.

It takes a lot of energy to berak these bonds and temprature is a measure of energy.

if you try the experiment make certain you are undr a fune hood and wear protective loves and apron.   801 °C can seriously burn skin and clothing

The temperature at which the liquid and the solid of refined compounds and elements can occur stable and in equilibrium is called the melting point.

Therefore, the melting point is related to the structural organization of the atoms.

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Answer:

It changes size and shape

Explanation:

Proving Air Is Matter

One way to prove that air is made of matter is to blow up a balloon. Before you add air into the balloon, it is empty and shapeless. When you puff air into it, the balloon expands, so you know it is filled with something—air is taking up the space.

Answer: essay the answer is B: precipitation

Explanation:

Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.

Answer:

According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants. A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side

Answer:

That should be crucible tong

Answer:

Delocalized electrons

Explanation:

Magnesium Chloride is an ionic compound, so its lattice structure prevents the flow of electrons. However, when you convert the ionic compound into an aqueous solution it allows movement of electrons/ions due to the breakdown of the molecular forces which make it conductible. In short, Ionic compounds as a solid are not conductible but they are in an aqueous form.

Noble gases have the maximum number of electrons in their outer shell. The statement made by the student about the stability of noble gases is generally true.

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Answer:

yes is it yes yes yes yes yes yes yes yes yes yes

AnswereYs

Explanatioynt:Yes

Answer:

The Correct IUPAC name is H3C - CH (CH3) - CH (C2H5) - (CH2)2 - CH3 Class 11

Explanation:

yes searched np is maybe right i not 100% sure i 50% is it right >:) tell if u got it right >:D

Answer:

4-ethyl-6-methyl-3-heptene

Explanation:

Longest chain is seven long so it is heptane

But there is a double bond, so that becomes heptene

The double bound starts on the third carbon, so it is 3-heptene (this tells us where the double bond is)

Now we just got to do the substituents!

There is a ethyl group of the fourth carbon and then a methyl group on the sixth!

Ergo, 4-ethyl-6-methyl-3-heptene