When correctly balanced using the smallest whole number coefficients, what is the coefficient of copper in the following formula.....Cu+S8---->Cu2S
A. 1
B. 2
C. 8
D. 16

Answer:

"The distance the spring stretches " is the correct option.

Explanation:

The Hooke's law for a spring is given by :

[tex]F_{spring}=-k\Delta x[/tex]

Where

k is spring constant in N/m

[tex]\Delta x[/tex] is the compression or stretching in the spring

Hence, the correct option for [tex]\Delta x[/tex] is (b) "the distance the spring stretches .

The distance the spring stretches  is the correct option.

[tex]F_{spring} = -k\Delta x[/tex]

here

K represent the spring constant

[tex]\Delta x[/tex] represent the compression or stretching in the spring

Therefore, second option is correct.

Learn more: https://brainly.com/question/1605083?referrer=searchResults

The density of rock = 5 g/cm³

Given

Volume of rock=20 cm³

Mass = 100 g

Required

Density

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

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

ρ = density  

m = mass  

v = volume  

Input given values in formula

[tex]\tt \rho=\dfrac{mass~of~rock}{volume~of~rock}=\dfrac{100~g}{20~cm^3}=5~g/cm^3[/tex]

Answer:D

Explanation:

Jus did this question & got it right

According to Newton's laws the statement which is true is statement D as in 'D' ball traveled the greatest distance. and used greatest amount of force.

Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.

It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.

The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.

Learn more about force,here:

https://brainly.com/question/5961485

#SPJ2

Answer:

Energy of 1eV is absorbed to move from n=2 to n=3

Explanation:

Since;

E =hc/λ

h= Planks's constant = 6.6 * 10^-34 Js

c= speed of light = 3 * 10^8 ms-1

λ = wavelength = 1240 * 10^-9 m

E =6.6 * 10^-34 * 3 * 10^8/1240 * 10^-9

E = 1.6 * 10^-19 J or 1eV

From the diagram, It is clear that an energy of 1eV is absorbed to move from n=2 to n=3

Answer:

1.6/0.100

= 16

16 x 5

= 80

now you need to multiply as you divided before so the answer is

=.80

Your welcome

Answer:

I think its, balanced chemical equations

Explanation:

Answer:

0.00676 M

Explanation:

A chemist prepares a solution of calcium bromide by weighing out 0.607g of calcium bromide into a 450ml volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's calcium bromide solution. Be sure your answer has the correct number of significant digits.

Step 1: Given data

Mass of calcium bromide (solute): 0.607 g

Volume of solution: 450 mL

Step 2: Calculate the moles corresponding to 0.607 g of calcium bromide

The molar mass of CaBr₂ is 199.89 g/mol.

0.607 g × 1 mol/199.89 g = 0.00304 mol

Step 3: Convert the volume of solution to liters

We will use the conversion factor 1 L = 1000 mL.

450 mL × 1 L/1000 mL = 0.450 L

Step 4: Calculate the molar concentration of calcium bromide

The molarity of the solution is:

M = moles of solute / liters of solution

M = 0.00304 mol / 0.450 L

M = 0.00676 M

Answer:

Power of a machine is defined as its rate of doing work. It is the rate of transfer of energy. SI unit of power is watt. The power of a machine is said to be one watt if it can work at the rate of one joule in one second.

Explanation:

Brainliest please?

Answer:

D. Glucose

Explanation:

The process of photosynthesis is carried out by plants, algae, and some types of bacteria, which capture energy from sunlight to produce oxygen and chemical energy stored in glucose.

Answer:

glucose and carbon dioxide i think

Explanation:

Answer:

E = 9.95×10⁻¹⁹ J

Explanation:

Given data:

Wavelength = 2×10⁻⁷ m

Energy of photon = ?

Solution:

Formula:

E = hc/λ

h = 6.63×10⁻³⁴ Js

c = 3×10⁸ m/s

by putting values,

E =  6.63×10⁻³⁴ Js × 3×10⁸ m/s / 2×10⁻⁷ m

E = 19.89×10⁻²⁶Jm / 2×10⁻⁷ m

E = 9.95×10⁻¹⁹ J

Answer:

Molecular formula = C₅H₁₀

Explanation:

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

Empirical formula of compound => CH₂

Molar mass of compound = 70.1 amu

Molecular formula of compound =...?

The molecular formula of a compound is usually a multiple (n) of the empirical formula i.e

Molecular formula = [CH₂]ₙ

Thus, to obtain the molecular formula of the compound, we must first determine the value of n. The value of n can be obtained as follow:

[CH₂]ₙ = 70.1

[12 + (2×1)]n = 70.1

[12 + 2]n = 70.1

14n = 70.1

Divide both side by 14

n = 70.1 / 14

n = 5

Molecular formula = [CH₂]ₙ

Molecular formula = [CH₂]₅

Molecular formula = C₅H₁₀

Thus, the Molecular formula of the compound is C₅H₁₀.

Answer:

Molecular formula = C₅H₁₀

Explanation:

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

Empirical formula of compound => CH₂

Molar mass of compound = 70.1 amu

Molecular formula of compound =...?

Explanation:

there you go

Answer:

-32.3 kJ

Explanation:

Step 1: Write the balanced thermochemical equation

2 Na₂O₂(s) + 2 H₂O(l) ⇒ 4 NaOH(s) + O₂(g)   ΔH° = -126 kJ

Step 2: Calculate the moles corresponding to 40.0 g of Na₂O₂

The molar mass of Na₂O₂ is 77.98 g/mol.

40.0 g × 1 mol/77.98 g = 0.513 mol

Step 3: Calculate the amount of heat released upon the reaction of 0.513 moles of Na₂O₂

According to the thermochemical equation, 126 kJ of heat are released every 2 moles of Na₂O₂.

0.513 mol Na₂O₂ × (-126 kJ/2 mol Na₂O₂) = -32.3 kJ

Answer:

62.068 g/mol

Explanation:

The molar mass of ethylene glycol is 62.068 g/mol.

Answer: 116 g of copper

Explanation:

[tex]Q=I\times t[/tex]

where Q= quantity of electricity in coloumbs

I = current in amperes = 24.5A

t= time in seconds =  4.00 hr = [tex]4.00\times 3600s=14400s[/tex]  (1hr=3600s)

[tex]Q=24.5A\times 14400s=352800C[/tex]

[tex]Cu^{2+}+2e^-\rightarrow Cu[/tex]

[tex]2\times 96500C=193000C[/tex]  of electricity deposits 63.5 g of copper.

352800 C of electricity deposits = [tex]\frac{63.5}{193000}\times 352800=116g[/tex] of copper.

Thus 116 g of Cu(s) is electroplated by running 24.5A of current

Thus  remaining in solution = (0.1-0.003)=0.097moles

Answer:

3 H⁺(aq) + 3 OH⁻(aq) ⇒ 3 H₂O(l)

Explanation:

Let's consider the molecular equation for the neutralization between hydrochloric acid and aluminum hydroxide.

3 HCl(aq) + Al(OH)₃(aq) ⇒ AlCl₃(aq) + 3 H₂O(l)

The complete ionic equation includes all the ions and the molecular compounds.

3 H⁺(aq) + 3 Cl⁻(aq) + Al³⁺(aq) + 3 OH⁻(aq) ⇒ Al³⁺(aq) + 3 Cl⁻(aq) + 3 H₂O(l)

The net ionic equation includes only the ions that participate in the reaction and the molecular compounds.

3 H⁺(aq) + 3 OH⁻(aq) ⇒ 3 H₂O(l)

Hydrochloric acid dissolves solid aluminum hydroxide and the net ionic equation of this reaction is 3H⁺ + 3OH⁻ → 3H₂O.

Net ionic reactions are those reactions in which all species are represent in their ionic form except spectatore ions, as they are present on both sides of the reaction.

Balanced Molecular chemical reaction between HCl and solid Al(OH)₃ will be represented as:
3HCl(aq) + Al(OH)₃(s) → AlCl₃(aq) + 3H₂O(l)

Now we write the above equation in the ionic form as below:

3H⁺ + 3Cl⁻ + Al³⁺ + 3OH⁻ → Al³⁺ + 3Cl⁻ + 3H₂O

In the above equation Al³⁺ and Cl⁻ are spectator ions as they are present on both side of the chemical reaction. So, net ionic reaction will be represented as:

3H⁺ + 3OH⁻ → 3H₂O

Hence, net ionic reaction will be 3H⁺ + 3OH⁻ → 3H₂O.

To know more about net ionic reaction, visit the below link:
https://brainly.com/question/25604204

There are a few things you could do, that would help.. type that into your search engine, sometimes in the results, there will be results that give answers to your question.. find a science helping app. There are a lot of apps that can help with your homework!! always come back on here. I would recommend coming here last. A lot of people on here give the wrong answers.. just try to figure it out yourself. OR contact your teacher. I have personally set up a meeting with my teacher, and it helped soooo much!!!

Answer:

The correct Answer is Number 3 the 74 g per mole ...

The gram-formula mass of Ca(OH)₂ is 74 g/mol. Therefore, option D is correct.

The quantity of a compound that has the same mass in grammes as the formula mass in an atomic mass unit is said to have the compound's gramme formula mass.

Each atom of each element has a distinctive mass, and each molecule of a compound has a distinctive mass determined by the complex's formula.

The mass of the solute divided by the solute's formula mass is known as the gramme formula mass. The atomic weights of all the atoms in the empirical formula are added to determine formula mass.

The gram formula mass of Ca(OH)₂ is 74.093 grams. This is the composed molar mass if each of the atoms in the molecule are one calcium atom, two oxygen atoms, and two hydrogen atoms.

Thus, option D is correct.

To learn more about the gram formula mass, follow the link;

https://brainly.com/question/492953

#SPJ5

Answer:

0.750 × 2 = 1.50 grams of Ca(CO3)

If each tablet of Tum antiacid contains 0.750 g of CaCO₃, 2 tablets contain 0.0150 mol of CaCO₃.

Tum antiacids are made of CaCO₃. If each tablet contains 0.750 g of CaCO₃, the mass of CaCO₃ in 2 tablets is:

2 Tablets × 0.750 g CaCO₃/1 Tablet = 1.50 g CaCO₃

Now, we want to know the moles of CaCO₃ in 1.50 g of CaCO₃. We need its molar mass.

The molar mass is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule.

The molar mass of CaCO₃ is 100.09 g/mol. The moles in 1.50 g of CaCO₃ are:

1.50 g × 1 mol/100.09 g = 0.0150 mol

If each tablet of Tum antiacid contains 0.750 g of CaCO₃, 2 tablets contain 0.0150 mol of CaCO₃.

Learn more about molar mass here: https://brainly.com/question/12127540

Answer:

They have the chance to inhale toxic fumes secreted by the mixture.

Explanation:

Answer:

sorry

Explanation:

Answer:

PbO2

Lead(IV) oxide/Formula

Explanation:

project

Answer:

gravity pull stuff down...

Explanation:

Answer:

Isabel is acting as a capitalist

Answer:

[tex]P=\dfrac{V^2}{R}[/tex]

Explanation:

Power is defined as the rate at which energy is dissipated.

Its mathematical form is given by :

P = VI

Where

V is voltage and I is current

Using Ohm's law :

[tex]I=\dfrac{V}{R}[/tex], R is resistance

Joule's law equation is given by :

[tex]P=\dfrac{V^2}{R}[/tex]

Hence, the correct option is (d).

Answer:

Mass = 90.28 g

Explanation:

Given data:

Mass of Ca(OH)₂ = ?

Volume of solution= 1.5 L

Molarity of solution = 0.81 M

Solution:

First of all we will calculate number of moles.

Molarity = number of moles / volume in L

by putting values,

0.81 M = Number of moles / 1.5 L

Number of moles = 0.81 M × 1.5 L

Number of moles = 1.22 mol

Mass of Ca(OH)₂ in gram:

Mass = number of moles × molar mass

Mass = 1.22 mol × 74.09 g/mol

Mass = 90.28 g

Answer:

D) is longer than the carbon-oxygen bond of acetone, (CH3)2CO

Explanation:

Delocalization has to to do with a situation in which electrons are not associated with with a single covalent bond in a molecule.

If a double bond is involved in delocalization, then it tends to exhibit greater single bond character. This implies that the bond will be longer than a normal double bond.

If we bring these ideas home to our particular context of CH3CONH2 and acetone, delocalization confers greater single bond character on CH3CONH2 making its C=O bond longer than that of acetone where there is no delocalization.

Answer:

0.641 moles of ethane

Explanation:

Based on the equation:

C2H6(g) + 7/2O2(g) → 2CO2(g) + 3H2O(l)

We can determine ΔH of reaction using Hess's law. For this equation:

Hess's law: ΔH products - ΔH reactants

ΔH = {2ΔHCO2 + 3ΔHH2O} - {ΔHC2H6}

Pure monoatomic substances have a ΔH = 0kJ/mol; ΔHO2 = 0kJ/mol

ΔH = {2*-393.5kJ/mol + 3*-285.8kJ/mol} - {-84.7kJ/mol}

ΔH = -1559.7kJ/mol

That means when 1 mole of ethane is in combustion there are released 1559.7kJ of heat. To produce 1.00x10³kJ there are needed:

1.00x10³kJ * (1mole ethane / 1559.7kJ) =

Answer: 7.8 and 8.0

Explanation:

that's it right up there :)