1. Calculate the mass of the product, if you started with 4 g of Zn and 3 g of H2CO3.
Zn + H2CO3
ZnCO2 + H2 * I’ll cash app for the right answer plus explanation”

Answer:

28%

Explanation:

concentration=(solute mass/solution mass)*100

C=concentration

md-solute mass

ms-solution mass

the solution mass is equal to the sum of the solute and solvent mass

ms=3.82+1.49=5.31lb

c=1.49/5.31 * 100=0.28*100=28%

Complete question is;

A certain chemical reaction 444 kj releases of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes 4.68 J of heat energy to raise the temperature of this calorimeter by 6.9 °C. Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . How would you calculate the number of moles of reactant that were consumed

Answer:

7.27 × 10^(-5) moles

Explanation:

We are given;

Heat energy = 444 kJ/mol

Final Temperature = 6.9 °C

Heat capacity = 4.68 J/°C

Let's calculate the heat generated from the formula;

Heat generated = heat capacity × final temperature

Heat generated = 4.68 × 6.9 = 32.292 J = 32.292 × 10^(-3) KJ

Now, the number of moles of reactant that were consumed is gotten from;

No_ of moles of rctnt consumed = heat energy generated/heat energy used = (32.292 × 10^(-3))/444 = 7.27 × 10^(-5) moles

Answer:

Explanation:

I HOPE IT HELPS :)

Answer:

Newton's third law of motion states that every action, there is an equal and opposite reaction force and that forces come in pairs

Answer:

Only Organism Z is alive, and Organism X has been dead longer than Organism Y.

Explanation:

After the death of an organism, there is radioactive disintegration of C-14 allotrope of carbon, which increases the ratio of C-12 to C-14 in a dead organism as compared to a living organism.

The study of chemistry and its bond is called chemistry.

The correct answer is A

After the death of an organism, there is radioactive disintegration occurs which leads to the breakdown of C-14 allotrope of carbon into the other isotopes,

Breakdown of these isotopes leads to the increase in the ratio of C-12 to C-14 in a dead organism as compared to a living organism.

Hence, the correct answer is A that is Only Organism Z is alive, and Organism X has been dead longer than Organism Y.

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The value of b : 3

Given

slope=m=1.5

points (0,3) and (4,9)

Required

The value of b

Solution

the Equation of a Line : y = mx + b

m = slope

b = constant

Find the slope :

m = (y₂-y₁)/(x₂-x₁)

m = (9-3)/(4-0)

m = 6/4

For the point that the line passes through : (0,3) then the equation :

3=6/4.0+b

3=b

And the equation :

y = 6/4x+3

Answer:

it is the same way it is purified in the state

Answer:

true

Explanation:

Answer:

V =  138.68 L

Explanation:

Given data:

Volume of CO₂ at STP required = ?

Mass of lithium carbonate produced = 456.9 g

Solution;

Chemical equation:

2LiOH + CO₂     →     Li₂CO₃ + H₂O

Number of moles of Li₂CO₃ produced:

Number of moles = mass/molar mass

Number of moles = 456.9 g/ 73.89 g/mol

Number of moles = 6.184 mol

now we will compare the moles of Li₂CO₃ with CO₂ from balanced chemical equation to get number of moles of CO₂  reacted.

                      Li₂CO₃      :        CO₂

                           1           :          1

                         6.184     :        6.184

Thus, 6.184 moles of  CO₂ reacted.

Volume of CO₂:

PV = nRT

R = general gas constant = 0.0821 atm.L /mol.K

1 atm × V = 6.184 mol ×0.0821 atm.L /mol.K × 273.15 K

V = 138.68 atm.L / 1 atm

V =  138.68 L

Answer:

A. Any substance with a pH above 7.

Explanation:

On the pH scale substances whose value is greater than 7 and less than 14 are termed alkali.

Acids have  a pH of less than 7 whereas neutral compounds such as water has pH of 7.

Answer:

C   A soluble solid that forms H+ ions in a solution

Explanation:

founders ed

Answer:

0.028578 km

Explanation:

The following data were obtained from the question:

Length of whale (in mm) = 28578 mm

Length of whale (in km) =?

We can convert 28578 mm to km by doing the following:

Recall:

1 mm = 1×10¯⁶ Km

Therefore,

28578 mm = 28578 mm × 1×10¯⁶ Km / 1 mm

28578 mm = 0.028578 km

Thus, 28578 mm is equivalent to 0.028578 km

The length of whale (in km) = 0.028578 km

Answer: C.X2Y4

Explanation:

Given that :

Compound has the empirical formula :

Empirical formula : CY2

The empirical formula expresses in Lowest term the whole ratio of the compound.

.

Empirical. Formula is usually written as :

XnYn+1

For instance, the ratio of the compound is :

n : n+1

Therefore, in the question:

XY2

Ratio :

X = 1 ; Y = 2 ; 1 /2 ;hence, the possible molecular number :

The possible moleculars are those whose XY mole ratio is 1 : 2

Comparing the ratios :

X2Y8 = 2/8 = 1 :4

ХЗҮЗ = 3/3 = 1 : 1

X2Y4 = 2 /4 = 1: 2

ХЗҮ9 = 3/9 = 1 :3

Hence, the only possible molecular formula is X2Y4

Answer : The volume in mL of the sodium carbonate stock solution is 364 mL.

Explanation :

According to dilution law:

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of aqueous sodium carbonate

[tex]M_2[/tex] = molarity of aqueous sodium carbonate stock solution

[tex]V_1[/tex] = volume of aqueous sodium carbonate

[tex]V_2[/tex] = volume of aqueous sodium carbonate stock solution

Given:

[tex]M_1[/tex] = 1.00 M

[tex]M_2[/tex] = 1.58 M

[tex]V_1[/tex] = 575 mL

[tex]V_2[/tex] = ?

Now put all the given values in the above formula, we get:

[tex]1.00M\times 575mL=1.58M\times V_2[/tex]

[tex]V_2=363.92mL\approx 364mL[/tex]

Therefore, the volume in mL of the sodium carbonate stock solution is 364 mL.

Answer:

Explanation:

The chemical formula for hydrogen phosphate​ is HPO₄²⁻

2 valence electrons

Explanation:

Most transition metals have 2 valence electrons. Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). Most transition metals have an electron configuration that is ns2(n−1)d , so those ns2 electrons are the valence electrons.

Answer:

25 g

Explanation:

Integers are positive or negative whole numbers together with zero. This definition implies that 25.1 g is not an integer.

Seeing that .10 is less than .50, we have to round 25.10 down to 25.

Hence, if i express 25.10g as an integer, i end up with 25 g

Answer:

Li+, C4+, O2-, and then F- They're written in decreasing ionic size.

Explanation:

Ionic size means the same thing as ionic radius.  Furthermore, Ionic radius is the distance away from the central atom. Ionic radius increases going from top to bottom and decreases across the periodic table.

Lithium is in the 1st family/group with a charge of +1.  So it has the biggest ionic radius.

Carbon is in the 4th family/group with a charge of +4. So it has a smaller ionic radius than Lithium.

Oxygen is in the 6th family/group with a charge of -2.  So it has a smaller ionic radius than Carbon.

Lastly, Fluorine is in the 7th family/group with a charge of -1. So it has a smaller ionic radius than Oxygen.

Answer:

Convection.

Explanation:

Due to the heat of the lamp, the liquid increases its temperature. This increase produces an increase in the energy and volume of the globs. But it also causes a decrease in the density of the bubble. As a result, they break off and rise to the top. We can see that the globs rise owing to convection because there is a transfer of heat in the fluid caused by the movement of the fluid's molecules with more energy towards the surface, where the molecules have less energy and are colder.

Answer:

New York City is susceptible to at least a magnitude 5 earthquake once every 100 years.

Explanation:

The probability of having major earthquakes or volcanoes occur in New York State is at least, one magnitude 5 earthquake can occur in New York City once every 100 years.

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.

The Circum-Pacific Belt, often known as the Ring of Fire, is a region in the Pacific Ocean marked by active volcanoes and frequent earthquakes. The Ring of Fire is where most of Earth's earthquakes and volcanoes occur.

Thus, at least, one magnitude 5 earthquake can occur in New York City once every 100 years.

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Answer : The volume of pure diamond is [tex]0.493inch^3[/tex]

Explanation : Given,

Density of pure carbon in diamond = [tex]3.52g/cm^3[/tex]

Moles of pure diamond = 23.7 moles

Molar mass of carbon = 12 g/mol

First we have to calculate the mass of carbon or pure diamond.

[tex]\text{ Mass of carbon}=\text{ Moles of carbon}\times \text{ Molar mass of carbon}[/tex]

Molar mass of carbon = 12 g/mol

[tex]\text{ Mass of carbon}=(23.7moles)\times (12g/mole)=284.4g[/tex]

Now we have to calculate the volume of carbon or pure diamond.

Formula used:

[tex]Density=\frac{Mass}{Volume}[/tex]

Now putting all the given values in this formula, we get:

[tex]3.52g/cm^3=\frac{284.4g}{Volume}[/tex]

Volume = [tex]80.8cm^3[/tex]

As we know that:

[tex]1cm^3=0.061inch^3[/tex]

So,

Volume = [tex]0.061\times 80.8inch^3[/tex]

Volume = [tex]0.493inch^3[/tex]

Therefore, the volume of pure diamond is [tex]0.493inch^3[/tex]

Answer:

good luck maybe A im not smart though

Explanation:

Answer:

the answer to the question is B!

Answer:

C.) If the solid is conductive, the bonds are metallic.

1) Substances with ionic bond conduct an electric current in liquid, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.

2) Substances with covalent bond not conduct an electric current in liquid and solid state, because they not have free ions or electrons.

3) Substances with metallic  bond conduct an electric current in liquid and solid state, because they have mobile electrons. Most metals have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.

Explanation:

Answer:

produces bubbles and hydrogen gas

The  proof of a chemical reaction of Zinc + Hydrogen Chloride is that after reaction it produces the hydrogen gas as white fumes.

When two reactants react in a reaction to form any product which can also be two or three and have some bi-product in the form of fumes or precipitate or any change in color so that we can conclude the results about the reaction.

In chemical reaction of Zinc + Hydrogen Chloride the producta are the zinc chloride and produces the white fumes of hydrogen gas which is a bi-product.

Therefore, it produces the hydrogen gas as white fumes is  proof of a chemical reaction of Zinc + Hydrogen Chloride is that after reaction.

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Answer:

As the temperature heats up then the viscosity is much higher, as defined in stress analysis and fluid mechanics. Reynolds number describes the speed and the inverse proportion.

Answer:

Number of moles of nitrogen gas =  9.84 mol

Explanation:

Given data:

Number of moles of nitrogen gas = ?

Number of moles of dinitrogen monoxide = 9.84 mol

Solution:

Chemical equation:

2N₂O     →       2N₂ + O₂

Now we will compare the moles of N₂O and N₂

                        N₂O           :           N₂

                           2             :             2

                          9.84         :           9.84