I am very confused on how to do this please read the following attachments

Answer:

A. Metal mixture is impure

Answer:

Density = 1.56 g/mL

Explanation:

We have two sort of concentrations in here, so let's combine them.

% by mass means grams of solute in 100 g of solution

M means, moles of solute in 1L of solution.

We know that our solute is KOH (Molar mass = 56.1 g/mol)

We convert the moles of solute to grams:

56.1 g/mol . 13.9 moles = 779.79 g

Now, we know that 50 g of solute are in 100 g of solution

Then, 779.79 g of solute will be contained in (100 . 779.79)/50 = 1559.58 g of solution

Density = mass / volume

1559.58 g of solution / 1000 mL of solution = 1.56 g/mL

Molar mass of MgCl₂ : 95 g/mol

An atomic mass unit ( amu or "u") is a relative atomic mass of 1/12 the mass of an atom of carbon-12.  

The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound

Can be formulated :  

M AxBy = (x.Ar A + y. Ar B)  

Compound MgCl₂

[tex]\tt M=Ar~Mg+2.Ar~Cl\\\\M=24+2.35.5\\\\M=24+71\\\\M=95~g/mol[/tex]

Explanation:

Aluminium hydroxide is amphoteric. Because it reacts with both acids and bases. Like any conventional base, the OH radical in Al(OH)3 neutralizes H+ to make water and an aluminium salt. Al(OH)3 solid will also react with excess OH– to dissolve and form the complex ion [Al(OH)4]−.

Answer:

Answer: Aluminium hydroxide ,AI(OH)3,is found in nature as the mineral gribbsite (also know as hydrargillite) and its three much rarer poly morphs

Explanation:

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Answer:

Frequency of photon is 0.513×10¹⁵ s⁻¹

Explanation:

Given data:

Energy of photon = 3.4×10⁻¹⁹ J

Frequency of photon = ?

Planck's constant = 6.63 × 10⁻³⁴ Js

Solution:

Formula:

E = hf

3.4×10⁻¹⁹ J = 6.626 × 10⁻³⁴ Js × f

f =  3.4×10⁻¹⁹ J / 6.626 × 10⁻³⁴ Js

F = 0.513×10¹⁵ s⁻¹

Frequency of photon is 0.513×10¹⁵ s⁻¹.

Answer:

violet

Explanation:

Waves with a short wavelength have the most energy. Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that. Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy (google)

Answer:

You answer is correct

Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.

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Answer:

I just did the assignment it's "decreases"

Explanation:

If you guys came from Ed-genuity (i'm writing it like that because apperantly that is a swear word?) That means the next questions are "As you move from left to right across the periodic table, electronegativity..." and "As you move from top to bottom within a group, the first ionization energy...".

for electronegativity, it's increases and for ionization energy it's decreases. Hope this helps!

Answer:

1. Decreases

2. Increases

3. Decreases

Answer:

cuticle

Explanation:

Hope this help :)

Answer:

B(cuticle)

Explanation:

Answer:

B. NaBr

D. KOH

Explanation:

Below is the solubility rules given for you knowledge.

Salts of

so using the rules above

NaBr , KOH are soluble, Pb(OH)2 is slightly soluble and AgCl is not soluble.

Answer:hope this helps had to guess these are the correct answers =)

Answer:

hope this helps

Explanation:

see pictures try to put them in order

Answer:

Unicellular organisms contain one cell and all of their functions are based on that one cell whereas multicellular organisms contain more than one cell and their functions are divided amongst different cells like nervous cells, cardiac muscle cells etc.

Explanation:

While multicellular creatures have numerous cells, unicellular organisms only have one.

A single cell makes up a unicellular creature, also referred to as a single-celled organism, as opposed to a multicellular organism, which is made up of numerous cells.

Prokaryotic and eukaryotic organisms are the two broad categories into which all organisms fall.

Unicellular organisms only have one cell, whereas multicellular species have many. While multicellular creatures carry out various cell functions through a clearly defined set of cells, unicellular organisms combine all cellular functions into one cell.

Multicellular and unicellular organisms are comparable in that they exhibit nearly all of the life's processes and functions, including metabolism and reproduction.

They have RNA and DNA, which can show a variety of lifestyles vital to the majority of the ecosystem in which we currently live.

Thus, these are some similarities and differences between unicellular and multicellular organisms.

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Answer:

The study of chemistry is about the learning of chemist arts

Answer:

Because the same amount of sugar is still there. The solid sugar crystals break apart in water as the sugar dissolves, but the individual sugar particles or molecules are still present and do not change as a result of dissolving in the water. The combined mass of the sugar and water shouldn't change.

Answer: condensing

Explanation:

Answer:

C

Explanation:

Answer:

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

Explanation:

the volume of the block is 4 x 2 x 4.5 and that equals 36. Divide the mass by the volume and you get [tex]\frac{18}{36}[/tex] which is equal to 2 g per cubic centimeters

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Answer:

I’m very confused can you clerify that?

Explanation:

Answer:my bit,cu,mghg

Explanation:

Answer:

Plum Pudding Model.

Explanation:

I just know.

Answer:

1.  An apple is something that has matter.

2. Light does not have matter. It neither has mass or takes up and space.

3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

4. A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!

5. A precipitate is a solid that forms out of solution.

6. In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.

Explanation:

Matter is anything that has mass and takes up volume.

Answer:

1. some thing that has matter is an apple, a person,a table. things that does 2.not Light.,Sound.,Heat.Energy.Gravity.Time.A Rainbow.Love.

3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

4.A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!

5.Precipitate: In chemistry, a solid formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid. In meteorology a precipitate is liquid or solid water (rain, snow, etc.) falling from the sky.

6.n simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.

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When an oceanic plate and a continental plate collide, both will subduct. Therefore, option 3 is correct.

Oceanic plates are plates found beneath the ocean. As previously stated, oceanic plates are denser than continental plates. This is due to the fact that they are made of denser rocks. Basalt is the most common material found in oceanic plates.

When compared to continental crust, oceanic crust formed at spreading ridges is relatively homogeneous in thickness and composition.

Because oceanic crust is naturally denser, when an oceanic plate converges with a continental plate, the oceanic crust will always subduct beneath the continental crust. Convergent boundaries are frequently linked to larger earthquakes and increased volcanic activity.

Thus, option 3 is correct.

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Answer:

because tiles conduct energy faster than carpet

Explanation:

when it is winter tiles are as coled as ice an carpet is barley coled when left a tile out in the sun I would burn like a stove but if you left a carpeted it would be warm

Answer: So if you had 570 cm of ribbon, then 570%2F8.5=67.05 which means that about 67 students can do the experiment (round down to the nearest whole number).

Explanation: If you had 8.5 cm of ribbon, then only 8.5%2F8.5=1 student can do the experiment. If you had 17 cm of ribbon, then 17%2F8.5=2 students can do the experiment.

Answer:

The correct answer is C. element

Explanation:

The sample cannot be an element because an element - or elemental substance - cannot be decomposed into simpler substances. Thus, it cannot be composed by differents types of atoms. For example, an element is carbon (C).

As the sample contains three types of atoms, it can be a compound, a molecule or a mixture, because they can be composed by different types of atoms - of different chemical elements. For example, the sample could contain the element carbon (C) combined with other elements, for example oxygen (O) or hydrogen (H), amoing others.

The sample can not be an element due to having only one type of atom.

The sample can be mixture, compound and molecule except element because element is formed from only one type of atoms which can not be broken down into simpler one. The sample contains three types of atoms which means it may be mixture, compound or molecule.

The reason behind this is that mixture, compound and molecule can be made up of three atoms whereas the element can't so we can conclude that sample can not be an element.

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Answer: The density of a material is defined as its mass per unit volume. In this example, each volume of water is different and therefore has a specific and unique mass. The mass of water is expressed in grams (g) or kilograms (kg), and the volume is measured in liters (L), cubic centimeters (cm3), or milliliters (mL).

Explanation: HOPE IT HELPS :)

Answer:

Chemical

Explanation:

Answer:

See explanation and image attached

Explanation:

The standard cell potential at 298 K is given by;

E°cathode - E°anode

Hence;

E°cell = 0.34 V - (-0.76 V)

E°cell = 0.34 V + 0.76 V

E°cell = 1.1 V

To reduce Zn^2+ to Zn then Zn must be the cathode, hence;

E°cell = (-0.76 V) - 0.34 V

E°cell = -1.1 V