Please help it's due today

Answer:

why is it asked in the chemistry isnt it maths question though

If 10.0 g of MgSO4⋅7H2O is thoroughly heated, the mass of anhydrous magnesium sulfate will remain is 4.88 grams.

Mass is the unit that quantify the matter in a physical body.

The molar mass of the MgSO4⋅7H2O is 246.47 grams.

When magnesium sulfate is heated, the molar mass of magnesium sulfate become 120.36 g/mol

Now, both molar masses are divide and multiplied by 10

[tex]\dfrac{120.36 g/mol}{246.47} \times 10 = 4.88 g.[/tex]

Thus, the mass of anhydrous magnesium sulfate will remain is 4.88 grams.

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Hot air expands and rises, becoming cooler and denser, then falling again in a continuous process

The convection current in the atmosphere is best explained as the process by which hot air expands and rises, becoming cooler and denser, then falling again in a continuous process.

Heat transfer by convection involves the transfer of heat by the actual movement of the heated molecules from the hot parts to the cooler parts of a fluid.

The continuous movement of hot air or liquid from bottom to the top and cold liquid or air from the top to the bottom is known as convection current.

Thus, we can conclude that convection current in the atmosphere is best explained as the process by which hot air expands and rises, becoming cooler and denser, then falling again in a continuous process.

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Answer:

C

Explanation:

the answer is C because that's what light year means

Answer:

The units used to measure stellar distance are the light-year, the distance light travels in 1 year, and the parsec (pc), the distance of a star with a parallax of 1 arcsecond (1 parsec = 3.26 light-years). The closest star, a red dwarf, is over 1 parsec away.

Explanation:

Answer:

C.

The air pressure creates a vacuum in the straw that pulls the air into the liquid.

The formal charge of an ion in a compound can be find out from  the number of bonds, valence electrons and nonbonding electrons. The charge of single bonded oxygens is  -1 and that of double bonded oxygen is 0. The formal charge of P is zero.

Formal charge of an ion is the charge it carries in one formula unit of a compound. It can be find out using the formula as follows:

Formal charge = number of valence electrons - number of non bonding electrons - bonding electrons/2.

Here, oxygen has 6 valence electrons and 2 and 6 nonbonded electron in a single bond. Number of bonded electron is 2 .

formal charge =  6 - 6-2/2 = -1.

The formal charge of double bonded oxygen = 6 - 4 - 4/2 = 0

The valence electrons in phosphorus is 5 and there is non non bonded electrons in it and the number of bonded electrons is 10.

Formal charge = 5 - 0 - 10/2 = 0.

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Answer:

the UV exposure is my guess

accretion disk- does not spin

solar system- a central star with planets around it

solar nebula- may form after a supernova

Hope this helps!!

Answer:

maybe all the basic oxide i guess

Explanation:

cuo + hcl -> cucl2 + h20

...

The reaction of zinc oxide with hydrochloric acid is as follows:

The reaction of zinc chloride with hydrochloric acid represents an example of a neutralization reaction. This reaction significantly forms zinc chloride which is a salt and water.

According to the context of this question, the desired product of the given reaction forms the salt. In this reaction, zinc oxide acts as a base while hydrochloric acid is the strongest acid.

When acid reacts with bases, the product formed is called a salt, so zinc chloride is a salt. This is because it is one of the characteristic properties of acid.

Therefore, the desired product of the reaction of zinc oxide with hydrochloric acid is well described above.

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This question involves the simple concept of percent by volume in a solution.

The volume of ethanol present in the bottle is found to be "48.75 ml".

The percent by volume of a solution means the amount of that substance present in the solution, represented as a fraction of the total volume of the solution. Hence, the volume of ethanol present in the bear can be found by using the following formula:

[tex]Percent\ by\ Volume\ of\ Ethanol = \frac{Volume\ of Ehanol}{Total\ Volume\ of\ Beer}(100\ \%)\\\\6.50\ \% = \frac{V}{750\ mL}(100\ \%)\\\\V = \frac{(6.50\ \%)(750\ mL)}{100\ \%}[/tex]

V = 48.75 mL

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Answer:

Magnesium hydroxide Mg(OH)2 Mg(OH)2(s) + 2 HCl(aq) -----> MgCl2(aq) + 2 H2O(l)

Explanation:

Answer:

D)Particle Arrangement

Explanation:

When solid carbon dioxide CO₂ will evaporate in gaseous carbon dioxide CO₂ the particles arrangement will change from ordered in solid state to completely disordered in gaseous state.

Bond type, gram formula mass and molecular polarity are not changed in the described physical transformation.

The value of mass of [tex]Hg(IO_3)_2[/tex] is 1843.84 g.

Given:-

Molar mass of [tex]Hg(IO_3)_2=550.40\ g/mol[/tex]

number of mole=3.35 mol

Formula for the calculation of mass of [tex]Hg(IO_3)_2[/tex] is as follows:-

[tex]Number\ of\ mole=\frac{Mass}{Molarmass}[/tex]

Substitute 550.40 g/mol for molar mass, and 3.35 for number of mole in the above equation:-

[tex]3.35\ mol=\frac{mass}{550.40\ g/mol} \\Mass=3.35\ mol\times550.40\ g/mol\\=1843.84\ g[/tex]

Hence, the value of mass of [tex]Hg(IO_3)_2[/tex] is 1843.84 g.

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Answer:

Explanation:

where anwser

Answer:

Because it is!

Explanation:

Hurricanes was the one of the big natural disaster . Yes, it was true and it is in the book of mythology.

It was so destructive primarily because levees around New Orleans, Louisiana failed. Levees are water barriers built to prevent flooding (parts of New Orleans have an elevation that is lower than sea level). When the levees failed, huge areas of the cities flooded.

Water is in constant motion, moving from the ocean to the sky to the earth. Flooding is a natural event which occurs when water overflows a stream, river or drain. Floods are caused by rainfall, melting snow or ice, or by the failure of structures such as dams.

There are main four parts  of water cycle . i.e. evaporation , convection , precipitation and - collection.

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Answer:

Destroyed.

Explanation:

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. 

Answer:

alkali metals is your answer

Answer:

alkali metals

Explanation:

Answer:

The empty can will fall when there is a light force and when there is a hard force, the empty can would be crushed.

Answer:

P = 14.3 atm

Explanation:

PV = nRT

T = 12 C + 273 = 285K

P = nRT/V

P = 14.0 mol H(0.08205 L * atm/mol * K)(285 K) / 22.9 K

mol, L, and K cancels out

P = 14.3 atm

The reason why  Br has a greater magnitude of electron affinity than that of I is that there is a greater attraction between an added electron and the nucleus in Br than in I.

In the periodic table, there are trends that increase down the group and across the period. Electron affinity is a trend that increases across the period but decreases down the group.

Recall that the ability of an atom to accept an electron depends on the size of the atom. The smaller the atom, the greater the attraction between an added electron and the nucleus.

Since Br is smaller than I, there is a greater attraction between an added electron and the nucleus in Br than in I which explains why Br has a greater magnitude of electron affinity than  I.

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Answer:

The answers are all small.

Explanation:

They are all small because a asteroid has a small amount of energy and produces a small amount a small crater. A small crater was likely formed by a small asteroid.

Diatomic

consist of two atoms bonded together. In contrast, monatomic elements consist of single atoms (e.g., Ar, He). Many compounds are diatomic, such as HCl, NaCl, and KBr. Diatomic compounds consist of two different elements. There are seven pure elements that form diatomic molecules.

Key Takeaways: Diatomic Elements

Diatomic elements are pure elements that form molecules consisting of two atoms bonded together.

There are seven diatomic elements: hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, bromine.

These elements can exist in pure form in other arrangements. For example, oxygen can exist as the triatomic molecule, ozone.

This is a list of the seven diatomic elements. The seven diatomic elements are:

Hydrogen (H2)

Nitrogen (N2)

Oxygen (O2)

Fluorine (F2)

Chlorine (Cl2)

Iodine (I2)

Bromine (Br2)

All of these elements are nonmetals, since the halogens are a special type of nonmetallic element. Bromine is a liquid at room temperature, while the other elements all gases under ordinary conditions. As the temperature is lowered or pressure is increased, the other elements become diatomic liquids.

Astatine (atomic number 85, symbol At) and tennessine (atomic number 117, symbol Ts) are also in the halogen group and may form diatomic molecules. However, some scientists predict tennessine may behave more like a noble gas.

While only these seven elements routinely form diatomic molecules, other elements can form them. However, diatomic molecules formed by other elements are not very stable, so their bonds are easily broken.

compounds

are formed by the chemical combination of two or more element. example water is a compound because two elements water and hydrogen come to form it.

Answer:

c

Explanation:

because of the law of gravity

Answer:

for instance :

water , H²O , and hydrogen peroxide . H²O² , are alike

in that their respective molecules are composed of hydrogen and oxygen atomd . hope its helpful . Good luck :)

Answer              A

Explanation:

Answer:

I know some of them...

Explanation:

1. What was the purpose of the experiment?

Type your answer here: The purpose of this experiment is to show that a cell membrane is a type of barrier, and is permeable to some substances, but may not be permeable to all substances.

2. What were the independent, dependent, and control variables in your investigation? Describe the variables used in the part of the experiment with the eggs.

Type your answer here: Independent variable / Manipulated variable: Refers to all the variables in an experiment that provoke a response in another variable. This variable is modified during the experiment to analyze how another variable responds to it. The researcher wants to study how the changes in these variables affect the dependent variable.  The researcher can change these variables to see what changes it implies in an object, process, trait, or anything that depends on them.

Dependent variable / Responding variable: Its response depends on any change in the independent variable. The dependent variable is the one that is being investigated, studied, and measured. It represents a quantity of something which value depends on how the independent variable is modified. It is usually identified by the letter Y.  A change in the dependent variable might be proportional or inversely proportional to the change in the manipulated variable. In the exposed example, the dependent variable is the egg circumference.

Constants / Controlled variables: Refers to those variables in an experiment that are controlled and have no influence on the results. These variables do not affect the change in the dependent variable values. In the exposed example the use of the lid to seal the jar and the amount and concentration of vinegar might be considered as a controlled variable. These elements are used but do not provoke any change in the size of the egg.

thats it... CAN SOMEONE ANSWER THE OTHERS?! I NEED ITT

Answer:Ra 15

Explanation: cL2>pc13