what is this element

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:

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:

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:

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

Answer:

.70 g of water will be formed.

Explanation:

NaOH    +   HBr  =   NaBr  +  H₂O

 40 g        103 g                    18 g

40 g of sodium hydroxide reacts with 103 g of HBr

2.6 g of sodium hydroxide reacts with 103 x 2.6 / 40 = 6.7 g of HBr

4.05 g of HBr is available so HBr is limiting reagent .

103 g of HBr reacts with  NaOH  to form 18 g of water

4.05  g of HBr  reacts with  NaOH  to form 18 x 4.05  / 103 g

= .70 g of water will be formed.

Answer:

B. Na and Li

Both are group I elements.

Answer:

it is the same way it is purified in the state

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:

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:

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

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:

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%

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:

m = 3.3 g

Explanation:

Hello!

In this case, since the specific heat of water is defined as 4.184 J(g*°C), given the temperature change and the absorbed energy, we can compute the mass of water as shown below:

[tex]Q=mC\Delta T\\\\m=\frac{Q}{C\Delta T}[/tex]

Thus, we plug in the given data to obtain:

[tex]m=\frac{970J}{4.184\frac{J}{g\°C}*71\°C}\\\\m= 3.3g[/tex]

Best regards!

Answer:

d

Explanation:

Isomers are molecules that have the same molecular formula(the same number of each atom), but different structural formulas

in this case both have the formula C2H5O

Answer:

m = 8.0×10⁴ g

Explanation:

Given data:

Density of plastic = 0.80 g/cm³

Dimensions of plastic sheet = 1.0 m × 10.0 m ×1 cm

Mass of sheet = ?

Solution:

First of all we will convert the length and width into cm.

length = 10.0 ×100 = 1000 cm

width = 1.0 ×100 = 100 cm

Volume = 1000 cm × 100 cm × 1 cm

Volume = 100000 cm³

Mass of sheet:

D = m/v

0.80 g/cm³ = m / 100000 cm³

m = 0.80 g/cm³ × 100000 cm³

m = 80,000 g

m = 8.0×10⁴ g

Answer:

A. An atomic nucleus is positively charged because it is composed of neutrons.

Explanation:

Answer:

good luck maybe A im not smart though

Explanation:

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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Answer: The mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.

Explanation:

We are given:

Amount of heat released = 1950 J = 1.950 kJ                 (Conversion factor: 1 kJ = 1000 J)

The chemical equation for the reaction of magnesium carbonate and hydrochloric acid follows:

[tex]MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2;\Delta H_{rxn}=-23.4kJ[/tex]

By Stoichiometry of the reaction:

If 23.4 kJ of heat is released, then 1 mole of magnesium carbonate is dissolved

So, when 1.950 kJ of heat is released, then = [tex]\frac{1mol}{23.4kJ}\times 1.950kJ=0.083mol[/tex] of magnesium carbonate is dissolved

To calculate the mass of the substance by given number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Moles of magnesium carbonate = 0.083 moles

Molar mass of magnesium carbonate = 84.3 g/mol

Putting values in above equation, we get:

[tex]0.083mol=\frac{\text{Mass of magnesium carbonate}}{84.3g/mol}\\\\\text{Mass of magnesium carbonate}=0.083mol\times 84.3g/mol=6.99g[/tex]

Hence, the mass of magnesium carbonate that will be dissolved in the reaction is 6.99 g.

Answer:

2HNO2 + O2 ------> 2HNO3

Explanation:

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]

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

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:

Volume of solution = 5 L

Explanation:

Given data:

Molarity of solution = 0.02 M

Moles of solute = 0.1 mol

Volume of solution = ?

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

by putting values,

0.02 M = 0.1 mol / volume of solution

Volume of solution = 0.1 mol / 0.02 M

Volume of solution = 5 L

Answer: what IS THAT bro what grade are you in

Explanation: