These are the questions

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 value of increase in business inventories.

Answer:

6.66 mol

Explanation:

(atm x L) ÷  (0.0821 x K)

(0.875 x 250) ÷  (0.0821 x 400)

=6.66108

Answer:

the third option:

increasing the masses of the objects and decreasing the distance between the objects

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:

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:

2 bonds

Explanation:

because carbon dioxides is CO2

the carbon bond to the oxygen

then the same carbon to another oxygen making CO2

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:

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 think the answer is Temperature but i don't know your options so I'm just going off of my test

Explanation:

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.

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:

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:

THE SPECIFIC HEAT OF THE METAL IS 0.14 J/g K

Explanation:

First, write out the variables in the question

Mass of sample = 18 g

Initial temp of metal = 96°C = 96 + 273 = 369 K

Mass of water = 21 g

Initill temp of water = 24°C = 24 + 273 K = 297 K

final temp of water and metal  = 26°C = 26 + 273 K = 299 K

temperature change = (

In calorimetry, there is conservation of energy and heat liberated by one is absorbed by the other. That is heat gained is equals to heat lost.

Heat lost by the metal = Heat gained by water

mc ΔT = mc ΔT

18 * C * ( 299 - 369 ) = 21 * 4.2 * ( 299 - 297)

18 * C * -70 = 21 * 4.2 * 2

-1260 C = 176.4

C = 176.4 / 1260

C = 0.14 J/ g K

The specific heat of the metal is hence 0.14 J/g K

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:

Ag is under going reduction

Answer:

A battery

Explanation:

A battery is a device which converts chemical energy into electrical energy . Most batteries operate as chemical cells. It is the redox reactions taking place inside the battery that causes electric current to flow via the terminals of the battery to an external circuit.

There are two main types of batteries, viz;

Rechargeable batteries

Non rechargeable batteries

A rechargeable battery is recharged by passing electric current in the reverse direction through the battery; it can be used multiple times to produce electricity in order to power devices. An example of a rechargeable battery is the Lithium-ion battery used in laptops and cell phones.

A non rechargeable battery will give electricity until the chemicals present it are used up(the chemical reactions producing electrical energy attain equilibrium). An example of a non rechargeable battery is a dry cell.

Answer:

72.8°C

Explanation:

Step 1:

Data obtained from the question. This include the following:

Specific heat capacity (C) = 0.24J/g°C

Mass (M) = 15g

Heat (Q) = 262J

Change in temperature (ΔT) =..?

Step 2:

Determination of the change in temperature.

The change in temperature, ΔT can be obtained as follow:

Q = MCΔT

262 = 15 x 0.24 x ΔT

Divide both side by 15 x 0.24

ΔT = 262 / (15 x 0.24)

ΔT = 72.8°C

Therefore, the change in temperature, ΔT is 72.8°C

Answer:

Empirical formula is Na₂CO₃

Molecular formula is Na₂CO₃

Explanation:

Percentage compositions of the elements;

Sodium = 46%

Carbon = 12 %

Oxygen = 42%

To determine empirical formula, we calculate the mole ratio first.

mole ratio =  % mass/atomic mass; where the atomic masses of the elements are :  Na = 23 u, C = 12 u and O = 16 u.

mole ratio: Na = 46/23; C = 12/12; O = 42/16

mole ratio (Na : C : O) = 2 : 1 : 2.6

approximate mole ratio = 2 : 1 :3

Therefore, empirical formula of compound is Na₂CO₃

To determine the molecular formula;

molecular formula or mass = n(empirical formula or mass)

n = molecular mass/empirical mass

molecular mass = 106 u,

empirical mass = 23*2 + 12 + 16*3 = 106 u

then, n = 106/106 = 1

therefore, molecular formula = 1 * (Na₂CO₃) = Na₂CO₃

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 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:

The density is 0.0187 g/L

Explanation:

First thing to do here is to calculate the Volume of 1 mole of CO2 using the ideal gas equation

Mathematically;

PV = nRT

thus V = nRT/P

what we have are;

n = 1 mole

R is the molar has constant = 0.082 L•atm•mol^-1•K^-1

P is the pressure = 0.0079 atm

T is temperature = 227 K

Substituting these values, we have;

V = nRT/P = (1 * 0.082 * 227)/0.0079

V = 2,356.20 dm^3

This means according to the parameters given in the question, the volume of 1 mole of carbon iv oxide is 2,356.20 dm^3

But this is not what we want to calculate

What we want to calculate is the density

Mathematically, we can calculate the density using the formula below;

density = molar mass/molar volume

Kindly recall that the molar mass of carbon iv oxide is 44 g/mol

Thus the density = 44/2356.20 = 0.018674136321195 which is approximately 0.0187 g/L

Answer:

1300cm3.

Explanation:

Step 1:

Data obtained from the question.

Initial temperature (T1) = K

Initial volume (V1) = 650 cm3

Final temperature (T2) = double the original = 2K

Final volume (V2) =..?

Step 2:

Determination of the new volume of the gas.

The new volume of the gas can be obtained by using Charles' law as follow:

V1/T1 = V2/T2

650/K = V2/2K

Cross multiply

K x V2 = 650 x 2K

Divide both side by K

V2 = 650 x 2K /K

V2 = 650 x 2

V2 = 1300cm3.

Therefore, the new volume of the gas is 1300cm3

The new volume of the gas is 1300cm³.

Given:

Initial temperature (T₁) = K

Initial volume (V₁) = 650 cm3

Final temperature (T₂) = double the original = 2K

To find:

Final volume (V₂) =?

Determination of new volume:

V₁/T₁ = V₂/T₂

650/K = V₂/2K

K x V₂ = 650 x 2K

V₂ = 650 x 2K /K

V₂ = 650 x 2

V₂ = 1300cm³

Therefore, the new volume of the gas is 1300cm³.

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Answer:

True.

Explanation:

To describe the problem of trying to locate a subatomic particle that behaves  like a wave, Werner Heisenberg formulated what is now known as the Heisenberg  uncertainty principle: it is impossible to know simultaneously both the momentum p  (defined as mass times velocity) and the position of a particle with certainty.

Making measurement of the momentum of a particle more precise means that the position must become correspondingly less  precise. Similarly, if the position of the particle is known  more precisely, its momentum measurement must become less precise.

Answer:

Temporary road closure or coffee break

Explanation:

Assume a car started on a trip at 08:00 and the graph below shows the total distance it travelled every half-hour.

We see that after 1 h (at 09:00) the car was a certain distance from the start.

A half-hour later (at 09:30) the car was still at the same distance.

The car was stopped.

There may have been a bad traffic accident that closed the road or the driver may have stopped for a quick cup of coffee.

Answer:

d

Explanation:

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 number of valence electrons is the number of electrons in the outer shell, that the atom uses for bonding. Nitrogen has 5 electrons in its n=2 (outer) shell. There is a quick way of identifying the number of valence electrons - it is the same as the Group number.

Explanation: