Explain what is wrong with the following structure.

Answer:

1. a) Crystalline hydrated salt lose their mass or moisture on exposure to the air and change into amorphous salt, the phenomenon is called efflorescence.

b) Two salts that x could be are gypsum (Caso4.H2O) and copper (II) sulfate (CuSO4.H2O).

Gypsum (Caso4.H2O) form anhydrite(CaSO4), when exposed to air and copper (II) sulfate (CuSO4.H2O) form a white layer of anhydrous copper (II) Sulfate when expose to sir.

2. a) Salt hydrolysis is defined as the ions from salts react with water and form either basic or an acidic solution.

b) Two examples of salts that produce alkaline solutions when dissolving in water are sodium bicarbonate (NaHCO3) and Calcium Carbonate (CaCO3).

Answer:

0.25

Explanation:

The first step is to determine how many moles of glucose there are, which means first finding out the molar mass of glucose. Carbon has a molar mass of about 12, hydrogen 1, and oxygen 16, so the total molar mass of glucose is about 6(12)+12(1)+6(16)=180 grams. This means that 90 grams is half a mole. Half a mole of substance divided by two liters of solution is (1/2)/2=1/4, or a molarity of 0.25. Hope this helps!

Answer:

0.200g de gas son obtenidos

Explanation:

La reacción de ácido clorhídrico, HCl, con Zn es:

2HCl(aq) + Zn(s) → ZnCl₂(s) + H₂(g)

Donde 2 moles de ácido reaccionan con 1 mol de Zn para producir una mol  de cloruro de cinc y una mol de hidrógeno (gas)

Asumiendo que el ácido está en exceso, las moles de 6.5g de Zn (Masa molar: 65.38g/mol) son:

6.5g × (1mol / 65.38g) = 0.0994 moles de Zn

Como 1 mol de Zn produce 1 mol de hidrógeno, las moles de hidrógeno son 0.0994 moles de H₂. En gramos (Masa molar H₂ = 2.01g/mol):

0.0994 moles H₂× (2.01g / mol) = 0.200g de gas son obtenidos

Answer:

3) 1

4) 0.2

5) 2

6) 1

7) 0.2

Explanation:

3)

The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.

4)

CO2 has a molar mass of just about 44 grams, meaning that 44 grams of it would be about a mole. 5000mL of solution is 5 liters, meaning that the molarity of this solution would be 1/5=0.2.

5)

HF has a molar mass of about 20, meaning that 20 grams of it is about a mole. 1/0.5=2M.

6)

Calcium flouride has a molar mass of about 78 grams, meaning that 156 grams is about two moles. 2000mL is 2 liters, meaning that this has a molarity of 2/2=1.

7)

Glucose has a molar mass of about 180 grams, meaning that 360 grams of it would be about 2 moles. 2/10=0.2.

Hope this helps!

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⣿⣿⣿⣿⣿⣶⣶⣦⣤⣤⣤⣤⣤⣤⣀⣒⠲⢾⣶⣶⣿⣿⠿⠟⣋⣴⣿⣿⣿

88w88 *what have I caught here?

Answer:

According to the law of conservation of matter, the mixture should weigh 175 g

Explanation:

The law of conservation of matter is one of the basic guiding principles of chemical reactions.

It states that matter is neither created nor destroyed but can be converted from one form to another.

Although this law has been faulted with advances in science and technology, it is still found basically useful.

So applying the law to the question at hand, it is expected that all the mass of the sugar gets added to all the mass of the water

This brings the total mass to 25 + 150 = 175 grams

The weight of the mixture of sugar and water has been 175 grams.

The law of conservation of mass has been based on the fact that the mass has neither been created and nor destroyed.

The law of conservation of mass stated the combination of the two compounds results in the final solution being the sum of the two reactants.

For example, the mass of a solution of compounds A and B will be:

Mass of A + Mass of B = Mass of solution

The sugar solution formed has been consisted of:

Sugar = 25 grams

Water = 150 grams.

According to the law of conservation of mass, the weight of the mixture has been:

Weight of mixture = Weight of sugar + Weight of water

Weight of mixture = 25 grams + 150 grams

Weight of mixture = 175 grams.

The weight of the mixture of sugar and water has been 175 grams.

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The answer is Acid

Explanation:

It's acid, because from its definition we can say that acid turns blue litmus paper red, and it is also corrosive and has a sour taste.

ANSWER Since 1.0 × 10 -7 has two significant figures, the pH can be reported as 7.00. A logarithmic scale condenses the range of acidity to numbers that are easy to use. Consider a solution with [H + ] = 1.0 × 10 -4 M. That is a hydrogen-ion concentration that is 1000 times higher than the concentration in pure water.

Answer:

The kind of bond formed depends on the identity of the bonding atoms and the shape of the molecule formed for covalent bonds.

Explanation:

There are various kinds of chemical bonds that could be present in a compound;

I) ionic bond

ii) covalent bond

iii) metallic bond

The kind of bond present in the compound depends on the elements involved in the bond. Metals and nonmetals mostly form ionic bonds win which electrons are transferred from metal to nonmetal.

Nonmetals commonly form covalent bonds with each other by sharing electrons in single, double and triple bonds. One may decide if the bond between two elements is ionic, covalent or polar covalent by looking at the electro negativity difference between the bonding atoms as well as the observed molecular geometry.

Finally, two metals are bonded by metallic bonds. This is the kind of bonds found in metallic crystals.

Answer:

Explanation:

Carbon dioxide reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.

Hope this helps you

Answer:

Law of conversation of mass

Explanation:

According to the law of conservation of mass, mass cannot be made or destroyed. The energy can only be transferred from one state of matter to another. When the mass is changed from one state of matter to another, the mass is rearranged and changed but is not destroyed. Thus it can be concluded that during a chemical reaction, the mass of the reactants and the products remain the same.

Answer:

pH of 7 (neutral)

Explanation:

At end of titration or equivalence point (point where you have added equal molar amounts of acids and bases) , the pH is 7.0 because the solution only contains water and a salt (which is a main characteristic of acid and base titrations/reactions).

The reason we only have water and salt is because H+ from acids neutralize OH- molecules in the solution, making water (which is neutral) and the salt does not affect the pH.

Since at equivalence point nor H+ or OH- reigns supreme (that is both are at equal molarity/concentration) the pH is neutral. The pH would be acidic or basic depending on if H+ was high or low, but here H+ is equal with OH- thus pH is neutral.

Answer:

Teaching

Explanation:

Teaching or tutoring is a type of human job that gives strength to other individuals by impacting them with the necessary knowledge or skills they required to survive in life.

Teachers or tutors are the people that carry out this task.

It should be understood that the most important thing that people need to survive in life is information. And when they are given the information they will do exploit.

The options, which are missing from this question are:

The job of an energy plant worker is similar to the role of a producer.

WHAT A PRODUCER DOES:

Therefore, the job of an energy plant worker is similar to the role of a producer.

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Answer:

b) the tendency of the atom to pull on electrons

Explanation:

a p e x

B. The tendency of the atom to pull on electrons. The electronegativity of an atom indicates its tendency to attract and pull electrons towards itself when it is part of a chemical bond.

It gauges how well an atom can draw and hold onto electrons in a chemical connection. In the periodic chart, electronegativity rises over a period (from left to right) and falls within a group (from top to bottom).

In a covalent bond, atoms with high electronegativity pull the shared electrons closer to their nucleus due to their higher attraction to electrons. The pull for electrons is weaker for atoms with low electronegativity, and thus are more prone to shed electrons to create positive ions during ionic bonding.

The difference in electronegativity between the two atoms in a bond also influences the kind of bond that is created. A strong difference in electronegativity will likely result in the formation of an ionic bond.

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The kind of material used to bake food will influence how much energy is required to heat it up and how quickly it cools. Due to the fact that metal conducts heat more effectively than glass, heating up metal pans often takes longer than heating up glass ovenware.

This implies that the metal absorbs heat from the oven more rapidly and effectively, needing more energy to attain the appropriate temperature. However, oven-safe glass will cool down more quickly than metal.

This is due to the fact that glass is a poor heat conductor, which means it takes more time for the heat to be absorbed by the glass. The glass will shatter after the dish is cooked and the heat is turned off.As the heat takes longer to dissipate, the metal cools down more quickly than the other materials.

In conclusion, glass cools more quickly than metal and requires less energy to heat up than oven-safe metal. This is because metal absorbs heat from the oven more rapidly and effectively than glass since metal is a stronger heat conductor than glass.

However, because glass is a poor conductor of heat, it takes longer for the food to cook and the heat to be absorbed. The glass cools down more quickly than the metal when the heat is gone.

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Answer:

Calcium chloride

Explanation:

Sublimation is the process whereby a solid substance is converted to gas when heat is applied. Solid normally gets converted to the liquid phase before reaching the gaseous phase but these substances gets converted from solid straight to gas

Solid—> Gas

Dry ice( solid CO2) and Ammonium chloride undergo sublimation while Calcium chloride doesn't.

Ammonium chloride

Answer:

The 2s orbital is at a higher energy level.

Explanation:

1s and 2s are present in the s sub-orbital which surrounds the nucleus. The s sub-orbital has a spherical shape. As per the level of the energy, the sub-orbitals are numbered as 1s, 2s, 3s, 4s, etc. respectively. The difference among the sub-orbitals is based on their level of energy. 1s has less energy level than 2s. The radius of 2s is more than 1s.

Answer:

2.74 Joules

Explanation:

The heat capacity of the metal is the amount of heat needed to raise the temperature of the metal by 1 k

heat capacity c of the sear grill = 458.5 J/K

initial temperature T1  = 292.5 K

final temperature T2 = 459.7 K

temperature change ΔT= 459.7 - 292.5 = 167.2 K

since the heat capacity is heat energy needed per degree rise in Kelvin, then the heat to raise the metal by this temperature change will be

heat required = c/ΔT = 458.5/167.2 = 2.74 Joules

Answer:

The formula is CnH2n+1OH

Explanation:

Answer:

V  = 426.76 mL

Explanation:

Para realizar este ejercicio, necesitas aplicar la siguiente expresion:

m = moles soluto / kg solvente (1)

donde:

m: molalidad.

Ahora bien, tenemos la molalidad de la solución la cual es 4.12 m y la masa de metanol que es 56.07 g. Obviamente, el agua es un solvente universal, por lo tanto en esta disolución, el soluto es el metanol y el solvente el agua.

Sabiendo eso, necesitamos ahora calcular los moles de soluto. Para ello usamos la siguiente expresión:

moles = masa / PM   (2)

El peso molecular, es la suma de todos los pesos atómicos involucrados en el compuesto. En el caso del metanol que es CH3OH, los pesos atómicos son:

C = 12 g/mol;    H = 1 g/mol ;    O = 16 g/mol

Calculemos entonces el peso molecular:

PM = 12 + (4*1) + 16 = 32 g/mol

Con este valor, podemos calcular los moles de metanol o soluto:

moles = 56.07 / 32

moles soluto = 1.75 moles de metanol

Ahora usamos la expresión (1), para despejar los kg de solvente y quedaría:

kg solvente = moles soluto / m   (3)

Reemplazamos los valores obtenidos y calculamos la masa de solvente en kilogramos:

kg agua = 1.75 / 4.12

kg agua = 0.42476 kg

Si este valor lo llevamos a gramos, que es simplemente multiplicar por 1000 o correr la coma 3 espacios a la derecha, tenemos:

masa de agua = 0.42476 * 1000 = 424.76 g

Finalmente, si la densidad del agua es 1 g/mL significa que el volumen de agua es igual a la masa de agua, por lo tanto

Y esta es la cantidad en mililitros de agua que se necesitan para preparar esta disolución con esa concentración.

Answer:

It will exert a pressure of 1.23 atm

Explanation:

To calculate the pressure it will exert, we shall be using the Gay Lussac pressure law

Here, we know that pressure and volume are inversely proportional.

Mathematically:

P1/T1 = P2/T2

From the question, P1 = 1.05 atm

P2 = ?

T1 = 25 which when converted to Kelvin scale will be 25 + 273 = 298

T2 = 75 + 273 = 348

Plugging these values, we have;

1.05/298 = P2/348

= P2 = (348 * 1.05)/ 298 = 1.226 which is approximately 1.23 atm

Answer:

The answer is option 1.

Explanation:

Lithium is a Group 1 element. So the correct charge for lithium should be Li+.

Answer:

(a)[tex]Li^{2+}[/tex]

Explanation:

Answer is (a)[tex]Li^{2+}[/tex]

As lithium has only one valence electron, it will lose one electron to form a cation with charge 1+ . Thus the correct Li ion is [tex]Li^{1+}[/tex]

Answer:

I and K cannot be intepreted. I think theres something wrong in the scanning. Besides that i hope this helps

Answer:

2 bonds

Explanation:

because carbon dioxides is CO2

the carbon bond to the oxygen

then the same carbon to another oxygen making CO2

Answer:

v = 78.5 km/h

Explanation:

It is given that, the distance between one city to another is 314 km. The overall trip takes 4 hours. We need ton find average velocity. It is equal to the total displacement divided by total time taken. So,

[tex]v=\dfrac{d}{t}\\\\v=\dfrac{314\ km}{4\ h}\\\\v=78.5\ km/h[/tex]

So, average velocity is 78.5 km/h.

Answer:

Ag is under going reduction

Answer:

The empirical formula of the compound with the data in the question is C2H6O

Explanation:

What we need to do here is to divide the individual masses of the elements by their atomic masses.

The atomic mass of oxygen is 16 a.m.u

The atomic mass of hydrogen is 1 a.m.u

The atomic mass of carbon is 12 a.m.u

Thus, we proceed as follows;

C = 0.783/12 = 0.06525

O = 0.521/16 = 0.0325625

H = 0.196/1 = 0.196

What is next here is to divide each of the values we have gotten above by the smallest value we have obtained. The smallest value we have obtained is that of oxygen which is 0.0325625

Hence, we have;

C = 0.06525/0.0325625 = 2.00

O= 0.0325625/0.0325625 = 1

H = 0.196/0.0325625 = 6

Thus, the empirical formula will be C2H6O

The equation,P(solution) = X(solvent * P(solvent), can be used to determine vapor pressure lowering. 300 grams of water is 300g x 1 mole/18.0g = 16.67 moles water. Thus, X = 16.67 moles water/17.07 moles total = 0.977 and the new pressure = 0.977 x 740 mm Hg = 723 mm Hg.

Answer:

City B has the larger annual temperature range

Explanation:

This is correct option because generally the northern side of the equator is high in temperature than the southern hemisphere part.

Since the southern side of the equator or Southern Hemisphere, where city A resides will generally have higher altitude or rise, so this creates higher average temperature.

Answer: 15.8 g of [tex]KMnO_4[/tex] will be required to produce 1.60 grams of [tex]O_2[/tex]

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} O_2=\frac{1.60g}{32g/mol}=0.05moles[/tex]

[tex]2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2[/tex]

According to stoichiometry :

As 1 mole of [tex]O_2[/tex] is given by = 2 moles of [tex]KMnO_4[/tex]

Thus 0.05 moles of [tex]O_2[/tex] is given by =[tex]\frac{2}{1}\times 0.05=0.10moles[/tex]  of [tex]KMnO_4[/tex]

Mass of [tex]KMnO_4=moles\times {\text {Molar mass}}=0.10moles\times 158g/mol=15.8g[/tex]

Thus 15.8 g of [tex]KMnO_4[/tex] will be required to produce 1.60 grams of [tex]O_2[/tex]