What is the charge of protons?

The mass of unreacted zinc = 13 g

The reaction equation is the chemical formula of reactants and products

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reactants and products

Reaction

[tex]\tt Zn+2HCl\Rightarrow ZnCl_2+H_2[/tex]

mol ratio Zn : HCl = 1 : 2

[tex]\tt mol=V\times M\\\\mol=0.1~L(100~cm^3)\times 2~mol/L\\\\mol=0.2[/tex]

[tex]\tt \dfrac{1}{2}\times 0.2=0.1~mol[/tex]

[tex]\tt 0.1\times 65=6.5~g[/tex]

[tex]\tt 19.5-6.5=\boxed{\bold{13~g}}[/tex]

Answer:

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Answer:

s orbitals - spherical shape

p orbitals - dumbbell shape

d orbitals- dxy, dyz , dzx -double dumbbell

- dx²-y²- double dumbbell (along axis)

-dz² -dumbbell with electron cloud

( along the axis)

therefore here the answer is 2s and 3s

Answer:

MnO4 − was reduced

C2 O4^2- was oxidized

Explanation:

2MnO4 −(aq)  +5H +(aq)  +2 C2 O4^2-(aq)  +6H+(aq)  →2Mn2+(aq) + 10CO2(g)  +8H2 O(l)

A redox reaction is characterized by a change in the oxidation number of reacting species from left to right in the reaction equation.

If we look at Manganese, its oxidation number was decreased from +7 on the left hand side to +2 on the right hand side. This implies that it gained five electrons. recall that reduction refers to electron gain.

If we look at carbon, its oxidation number increased from +3 on the left hand side to +4 on the right hand side. This indicates loss of one electron and oxidation refers to electron loss.

MnO₄⁻ was reduced and C₂O₄²⁻ was oxidized in the titration.

The balanced chemical equation for the reaction can be expressed as:

[tex]\mathbf{6H^+_{(aq0} + 2MnO_4^-_{(aq)} + 5H_2C_2O_4 _{(aq)} \to 10CO_{2(g)} +8H_2O_{(l)} + 2Mn^{2+}_{(aq)}}[/tex]

A redox reaction can be described by a variation in the oxidation number of reacting species in the chemical reaction equation from the reactant side to the product side

Let consider Mn in MnO₄⁻, its oxidation number was decreased from +7 on the reactant side to +2 on the product side. This shows a gain of additional five electrons.

Thus, MnO₄⁻ is reduced.

Also in C₂O₄²⁻, the oxidation number of carbon increases from +3 on the reactant side to +4 on the product side. Since an electron is lost, then oxidation  occurs at C₂O₄²⁻  

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Answer:

A

Explanation:

Hope this helps :)

1) Body tube (Head): The body tube connects the eyepiece to the objective lenses. Arm: The arm connects the body tube to the base of the microscope. Coarse adjustment: Brings the specimen into general focus. Fine adjustment: Fine tunes the focus and increases the detail of the specimen.

2)Microscopes are made up of lenses for magnification, each with their own magnification powers. Depending on the type of lens, it will magnify the specimen according to its focal strength.

3)In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. ... The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x. (Microscopes usually come with a set of objective lenses that can be interchanged to vary the magnification.)

Answer:

up 1

Explanation:

Answer:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

Explanation:

Your answer should be- that in a chemical reaction mass is neither created nor destroyed.

Explanation:

Is that good?

Answer:

its either A or C

Explanation:

Q) which sentence uses emitting correctly ?

Explanation :

Emitting means ' to give off ' , since birds are giving off a strange sound , we say " Charlie heard birds emitting a very strange sound " .

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 12 × 5

We have the final answer as

Hope this helps you

Answer:

the anwcer on edg 2020 is yes  

HOPE THIS HELPS

Explanation:

Answer:

Write the ionic equation by breaking all the soluble ionic compounds into their respective ions. Each ion should be shown with its charge and an to show that it is present in solution. Use coefficients to show the number of each ion present.

Explanation:

Hope this helps and I hope you have a wonderful day! Spread the love!

Explanation:

The periodic table is an arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations and recurring chemical properties.

Answer:

c) There are sharp emission lines demonstrating discrete energy levels.

Explanation:

When an element emits energy in the form of radiation, it produces a spectrum of colors on a photographic plate. This spectrum can either be continuous or discrete. In continuous spectrum the spectrum continues without any discrimination between two regions. This represents the continuous emission of radiation, and thus the continuous emission of energy without any break.

On the other hand, the line spectrum consists of discrete and sharp lines, which shows the emission of radiation in a certain amount in a certain time, with a break between emission. Hence, the line spectra supports the quantization of energy.

The correct option is:

c) There are sharp emission lines demonstrating discrete energy levels.

Lead

Explanation:

by emission of alpha particles

The end product of the decay of uranium 238 is Pb-206.

Heavy elements are generally grouped into four decay series which are; Thorium series, Uranium series and actinium series and Neptunium series.

These heavy elements decay via a series of α and β emissions until a stable nucleus is finally achieved. All these decay series usually terminate in a lead nucleus.

Uranium 238 belongs to the uranium decay series and terminates at Pb-206.

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Answer:

It looks like a solid because they are densely packed kind of like an ice cube

Explanation:

The state of matter shown in this figure is solid state, because the particles are arranged densely in the form of cube.

The state of matter known as a solid has a definite form, mass, and volume. Changing the temperature causes extremely little variations in volume to be seen. For instance, sand, wood, copper, ice, etc., cannot be crushed.

One of the three fundamental states of matter, along with liquid and gas. Since atoms' energy drops when they adopt a comparatively organized, three-dimensional structure, solids can emerge from liquids or gases.

Because solids have specific mass, volume, and form, their component particles are arranged compactly. Between molecules, there is little intermolecular space. As a result, there is a strong force between the constituent particles (atoms, molecules, or ions).

Thus, option A is correct.

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Answer:

The metals in this group are lithium, sodium, potassium, rubidium, cesium, and francium. The gas hydrogen is also put in this group because it shares similar reactivity with the alkali metals.

I don't know if this is what you wanted or not sorry if it isn't

Answer:

can you aks it more clerlry

Explanation:

Answer:

56.9 amu

Explanation:

Depending on the number of isotopes an element has, the Average atomic mass of isotopes of an element can be calculated using:

(atomic mass of isotope1 × decimal abundance of isotope1) + (atomic mass of isotope2 × decimal abundance of isotope2)

According to this question, two isotopes of element Z were given

- Isotope Z- 56 with atomic mass 56 is 70% abundance. This means that its decimal abundance is 0.70

- Isotope Z- 59 with atomic mass 59 is 30% abundance. This means that its decimal abundance is 0.30

Therefore, average atomic mass of element Z is:

= (56 × 0.70) + (59 × 0.30)

= (39.2) + (17.7)

= 56.9

Answer:

a few days ago of course I was a in the my life pro chef chef cooking channels and then the first first place to for the you know what do not you can be you know how much

Answer:

When two substances that are of different temperatures are brought together and there is heat transfer such that the substances come to thermal equilibrium, the effect on the particle motion are as follows

1) The particle motion of the hotter body reduces, because its temperature reduces

2) The particle motion of the colder body increases, because its temperature increases

3) For gases, the volume and or pressure reduces for the hotter body, and if the temperature of the gas falls below the boiling point temperature, the gas will change into liquid

For the colder gas, only the volume and or pressure increases and the temperature rises

4) For liquids, if the temperature of the hotter liquid falls below the melting point, the hotter liquid will become a frozen solid

For the the colder liquid, if the temperature is raised above the boiling point, the liquid changes into gas and the temperature does not rise above the boiling point temperature, until all the cold liquid has evaporated

5) For solids, the vibration of the particles of the hotter substance reduces and the solid becomes more brittle

For the colder body, the rise in temperature causes an increase in vibration of the particles, and if the temperature rises above the melting point, the colder solid will begin to melt

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question

mass = 63 g

volume = 75 mL

We have

[tex]density = \frac{63}{75} = \frac{21}{25} \\ [/tex]

We have the final answer as

Hope this helps you

Answer

The answer is SOLIDS

Explanation:

Answer:

the first one

Explanation:

the first one is the base because it has a lower PH

Answer: I think the ethanol in the solute and the sucrose is the solvent. Hope this helps!

Explanation: i learned this last year I think it is right?

A solvent is a chemical that dissolves a solute to produce a uniform solution. A solute is a substance that dissolves in a solvent, resulting in a homogeneous mixture. The solute is sucrose, and the solvent is ethanol.

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