1. A student combined silver nitrate and sodium
chloride. She observed a white solid precipitate
formed. The mass of the silver chloride precipitate
was measured to be 150.15 g. According to the Law
of Conservation of mass, what is the predicted mass
of the sodium nitrate produce
AgNO
AgCl white
precipitate in
solution
Naci
NaNO
solution
solution
300.23 g
300.23 90
+ NaCl
AgNO3
AgC1
+
NaNO3
silver nitrate
and sodium chloride
yield silver
chloride
and
sodium nitrate

Answer:

the answer to the first one is B and the second one is that the volume is a control, the heart rates are dependent, the how music played is controlled, how the heart rates are measured is controlled, the music played is independent

Answer:

1.47 g

Explanation:

Answer: What types of bonds exist between the atoms in a molecule of sodium sulfate, Na2SO4 ? The formula for this compound can be written as [Na+]2[SO42-], the sulfate anion is formed by covalent bonding between sulfur and oxygen. Since there is a bond polarity to a S-O bond these are polar covalent bonds.

Explanation:

The sulphate anion is created via covalent interaction between oxygen and sulphur, and the formula to this chemical is [[tex]Na^+[/tex]][[tex]SO_4^{2-}[/tex]]. These S-O bonds constitute polar covalent bonds because they have a bond polarity.

A polar bond represents a particular type of covalent bond in general. It is also the point at which an ionic bond and an unadulterated covalent bond begin to form, according to another definition. A polar covalent bond, on the other hand, is a link that occurs between two atoms and is made up of electrons which are scattered unevenly if we would like to explain it more precisely. The molecules have a tendency to have an electrical dipole moment in which the two ends are slightly either positive or negative as a result of this condition. The sulphate anion is created via covalent interaction between oxygen and sulphur, and the formula to this chemical is [[tex]Na^+[/tex]][[tex]SO_4^{2-}[/tex]]. These S-O bonds constitute polar covalent bonds because they have a bond polarity.

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Answer:

Here goes

Explanation:

the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.

Answer: True

Explanation: I have done this before but I hope this helps.

Answer:

Fully saturated or "a chance of rain"

Explanation:

When relative humidity reaches 100%, the air is fully saturated with vapor. That means that there is a possibility of rain.

The volume : 8,526 quarts

Given

The density of whole milk = 1.04 g/ml

mass = 18.5 pounds

Required

The volume

Solution

Conversion of mass

1 pound = 453,592 g

18.5 pounds = 8391,45 g

Density formula:

[tex]\large{\boxed {\bold {\rho~=~ \frac {m} {V}}}}[/tex].

Input the value :

V = m : ρ

V = 8391,45 g : 1.04 g/ml

V = 8068.7 ml

1 ml = 0,00105669 quarts

8068.7 ml =8,526 quarts

The question is incomplete, here is the complete question:

Consider the following intermediate reactions.

[tex]CH_4(g)+2O_2\rightarrow CO_2(g)+2H_2O(g);\Delta H_1=-802kJ[/tex]

The overall chemical reaction is as follows:

[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(I);\Delta H_{rxn}=-890kJ[/tex]

What is the correct enthalpy diagram using the Hess law for this system? (Image is attached below)

Answer: The correct image is Image A.

Explanation:

According to Hess’s law of constant heat summation, the amount of heat absorbed or evolved in a given chemical equation or system remains the same whether the process occurs in one step or in several steps.

According to this law, the enthalpies of these chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to know the required equation.

It also means that the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given intermediate reactions are:

[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l);\Delta H_1=-802kJ[/tex]                 ...(1)

[tex]2H_2O(g)\rightarrow 2H_2O(l);\Delta H_2=-88kJ[/tex]           ....(2)

The final reaction follows:

[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l);\Delta H_{rxn}=-890kJ[/tex]

Negative sign of the enthalpy represents the heat is being released which is represented by the downward arrow in the diagram.

By adding equation 1 and equation 2, we get:

[tex]\Delta H_{rxn}=\Delta H_1+\Delta H_2\\\\\Delta H_{rxn}=-802+(-88)=-890kJ[/tex]

Hence, the correct image is image A.

Answer:

A

Explanation:

Edg

Answer:

1943.1 moles

Explanation:

From the question given above, the following data were obtained:

Volume (V) = 50200 L

Temperature (T) = 25 °C

Pressure (P) = 720 mmHg

Number of mole (n) of H₂ =?

Next, we shall convert 25 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Temperature (T) = 25 °C

Temperature (T) = 25 °C + 273

Temperature (T) = 298 K

Next, we shall convert 720 mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

720 mmHg = 720 mmHg × 1 atm / 760 mmHg

720 mmHg = 0.947 atm

Thus, 720 mmHg is equivalent to 0.947 atm

Finally, we shall determine number of mole of Hydrogen gas, H₂, needed to fill the balloon as follow:

Volume (V) = 50200 L

Temperature (T) = 298 K

Pressure (P) = 0.947 atm

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) of H₂ =?

PV = nRT

0.947 × 50200 = n × 0.0821 × 298

47539.4 = n × 24.4658

Divide both side by 24.4658

n = 47539.4 / 24.4658

n = 1943.1 moles

Answer: 0.500

Explanation:17.0 g H202 x (1 mol H202/34.0 g H202)=0.500 mol H202

Answer: 0.5 moles are present in 17.0 g of [tex]H_{2}O_{2}[/tex] .

Explanation:

Number of moles present in a substance is the given mass divided by molar mass of the substance.

As the given mass of [tex]H_{2}O_{2}[/tex] is 17.0 g and its molar mass is 34 g/mol.

Hence, number of moles present in given 17.0 g of [tex]H_{2}O_{2}[/tex] is as follows.

No. of moles = [tex]\frac{mass}{molar mass}[/tex]

                     = [tex]\frac{17.0 g}{34 g/mol}[/tex]

                     = 0.5 moles

Therefore, 0.5 moles are present in 17.0 g of [tex]H_{2}O_{2}[/tex] .

Answer:

1.72x10⁻⁵ g

Explanation:

To solve this problem we use the PV=nRT equation, where:

And we solve for n:

Finally we convert moles of helium to grams, using its molar mass:

Answer:

528.25 Calories

Explanation:

From the question given above, the following data were obtained:

Energy in Joules = 2210.20 J

Energy in calories =?

We can convert 2210.20 J to calories by doing the following:

4.184 J = 1 cal

Therefore,

2210.20 J = 2210.20 J × 1 cal / 4.184 J

2210.20 J = 528.25 Calories

Thus, 2210.20 J is equivalent to 528.25 Calories.

Answer:

Physical Property

Explanation:

Density, mass, volume, color, melting and boiling points, etc. are all physical properties. No matter what changes, the chemical makeup stays the same.

Flamability, acidity, toxicity, etc. are chemical properties, because they chemically change the makeup of the object/thing.

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom

Explanation:

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴

Answer:

a motor that requires no energy input once it is running

Answer:

c

Explanation:

a p e x :)

Answer:

Liquid,gas,solid and plasma

Explanation:

There four phases of matter. These phases are the gas phase(steam), the liquid phase(water), the solid phase(Ice) and finally the plasma phase(moucous).

At diverging plate boundaries, earthquakes occurs as the plates pull away from each other. Volcanoes form between the plates, as magma rises upward from the underlying mantle. Second, two plates may come together, at a converging plate boundary. Two situations are possible at converging plate boundaries.

Mountain ranges, volcanoes, and earthquakes can all be found when convergent borders occur. Finally, transform boundary locations are also the site of earthquakes. Every learning exercise we completed served as a piece of proof.

When two chunks of the ground abruptly slide past one another, an earthquake results. The fault or fault plane is the area where they slide.

Earthquakes often result from subsurface rock breaking unexpectedly and fast movement along a fault. The seismic waves that cause the ground to tremble are brought on by this quick release of energy.

A fault line causes the Earth's crust to suddenly shift, causing an earthquake. The epicenter is the place where an earthquake first occurs. Near the epicenter of an earthquake, shaking may be quite violent.

Thus, mountain ranges, volcanoes, and earthquakes can all be found when convergent borders occur.

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Answer:

²³⁰₉₀Th

Explanation:

X  →  ²²⁶₈₈Ra  +   ⁴₂He

The given equation shows the alpha emission. When He particle emit the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.  It means the parent atom is  ²³⁰₉₀Th.

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Answer:

Na⁺

Explanation:

Given parameters:

         Number of protons = 11

         Number of neutrons  = 12

Writing the expression based on sodium ion that lost one electron;

In a neutral sodium atom, the number of protons and electrons are the same. Number of protons are the the positively charged particles in an atom.

Number of electrons are the negatively charged particles.

If an atom loses electron for instance sodium:

           Number of electrons  = 10

           Number of protons  = 11

Charge on the atom  = 11  - 10  = 1+

So, the symbol of the atom is Na⁺

Answer:

Back away from the situation and tell the supervisor/teacher

Answer:

4

Explanation:

The Balmer series refers to to a series of spectral emission lines of the hydrogen atom that occurs when an electron moves from higher energy  levels to the energy level of n= 2.

Hence;

λ =  486.3 * 10^-9 m

RH = 1.097 * 10^7 m-1

nf = 2

ni = ?

Using the formula;

1/λ = RH (1/nf^2 - 1/ni^2)

1/486.3 * 10^-9 = 1.097 * 10^7 (1/4 - 1/ni^2)

2.06 * 10^6/1.097 * 10^7 = (1/4 - 1/ni^2)

0.188 = 1/4 - 1/ni^2

1/ni^2 = 1/4 - 0.188

1/ni^2 = 0.25 - 0.188

1/ni^2 = 0.062

ni^2 = 16

ni = 4

Answer:

1/4

Explanation:

From the question given above, the following data were:

Original amount (N₀) = 100 g

Time (t) = 24.8 h

Fraction remaining =?

NOTE: The half-life of K–42 is 12.4 h

Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

Time (t) = 24.8 h

Half-life (t½) = 12.4 h

Number of half-lives (n) =?

n = t / t½

n = 24.8 / 12.4

n = 2

Finally, we shall determine the fraction remaining. This can be obtained as follow:

Number of half-lives (n) = 2

Fraction remaining =?

Fraction remaining = 1/2ⁿ

Fraction remaining = 1/2²

Fraction remaining = 1/4

Answer:

Ammonium bromide can be prepared by the direct action of hydrogen bromide on ammonia. It can also be prepared by the reaction of ammonia with iron(II) bromide or iron(III) bromide, which may be obtained by passing aqueous bromine solution over iron filings.

Explanation:

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Answer:

Fewer bubbles will be produced because of fewer collisions of reactant molecules

Explanation:

As the solid dissolves into the solution after the liquid has been vigorously bubbled, if the temperature of the liquid is reduced a little, what will happen is that fewer bubbles will be produced as a result of lesser amount of collisions occurring between the reactant molecules

Answer:

b

Explanation:

Answer:

Calcium

Explanation:

Calcium is the only metal here

hope this helps...

A positive ion is an atom or a molecule that has a net positive charge. The charge of the proton in an atom or a molecule is positive.

A subatomic found in the atom or the molecule that lacks a positive charge is called an electron.

The correct answer is:

Option C. Calcium

This can be explained by:

Calcium is the only metal found in the given list and hence is the answer.

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Answer:

which?........................