How much heat is needed to raise the temperature of 55.0 g sample of water by 65.0 oC.
The specific heat of water is 4.18 J/g oC. (Q = mxcx AT)



PLEASE HELP

Answer:

0.084 M

Explanation:

molar mass of Na3PO4 = 3*23 + 31 + 4*16 = 164 g/mol

moles of Na3PO4 = mass / molar mass = 0.46/164 = 0.0028 mol

There are 3 moles of Na+ in 1 mol of Na3PO4, so there are 3*0.0028 = 0.0084 moles of Na+ in the solution

Molarity is defined as:

M = moles of solute/litre of solution

100 ml are equivalent to 0.1 L

Therefore:

M of Na+ = 0.0084/0.1 = 0.084 M

An example of an exothermic reaction is : C. oxidation of iron. The Exothermic process involves the liberation of heat.

An exothermic reaction is a chemical or physical reaction that gives heat. It takes out energy to its surroundings. The energy needed for the reaction to occur is less than the total energy released.

In the oxidation of iron, the heat is released while all the other processes are endothermic in which is heat is absorbed.

Thus, the correct option is C.

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Answer:

is a mutiply choice answer just to be specific

Explanation:

Final answer:

Elements from the chalcogen group (group 16), which have six valence electrons, will combine with calcium in a 3:2 ratio to form a compound, such as calcium oxide ([tex]Ca_3O_2[/tex]).

Explanation:

The question asks which group of elements and how many valence electrons they have that would combine in a 3:2 ratio with calcium to form a compound. Calcium is an alkaline earth metal and has two valence electrons. It is located in group 2 of the periodic table. For elements to combine with calcium in a 3:2 ratio, we need to look for elements that will combine in such a way that three atoms of that element will bond with two atoms of calcium. This typically occurs with nonmetals from the chalcogen group (group 16), which have six valence electrons each.

For example, if we consider oxygen (O), which is a member of the chalcogen group, it can be seen that two calcium atoms (each providing two valence electrons for a total of four electrons) will combine with three oxygen atoms (each needing two electrons to complete its valence shell) to form calcium oxide ([tex]Ca_3O_2[/tex]) in a 3:2 ratio, utilizing all valence electrons involved in the bond formation.

Answer:

The pressure in the container is 1,7 atm.

Explanation:

We convert the unit of temperature in Celsius into Kelvin:

0°C= 273K --> 45°C= 45 + 273= 318 K

We use the formula:

PV=nRT ---> P =nRT/V

P= 1,20 mol x 0,082 l atm/K mol x 318 K/18,0 L

P= 1, 7384 atm

Answer:

1.06M

Explanation:

Given parameters:

Mass of HBr  = 50g

Volume of water  = 600mL

unknown:

Molarity of the solution = ?

Solution:

The molarity of a substance is the number of moles of solute in a volume of solution.

   Mathematically;

             Molarity  = [tex]\frac{number of moles }{volume}[/tex]

Since the number of moles is unknown, let us solve for it;

         Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

               Molar mass of HBr  = 1 + 80  = 81g/mol

    Number of moles  = [tex]\frac{50}{81}[/tex]    = 0.64mole

Convert the volume to liters or dm³;  600mL  =  0.6L or 0.6 dm³

Input the parameters and solve;

            Molarity  = [tex]\frac{0.64}{0.6}[/tex]   = 1.06M

Answer:

0.06 kg

Explanation:

Given data:

Mass of frisbee = ?

Velocity of frisbee  = 11 m/s

Energy of frisbee = 3.6 j

Solution:

K.E = 1/2 mv²

Now we will put  the values in this formula.

3.6 J = 1/2 m(11m/s)²

3.6 j = 0.5 ×121m²/s² × m

3.6 j = 60.5 m²/s² × m

m = 3.6 j/60.5 m²/s²

m= 0.06 j.m⁻².s²

j = Kg.m².s⁻²

m= 0.06 Kg.m².s⁻² .m⁻².s²

m = 0.06 kg

Answer: specie

Explanation:

A specie is the smallest group of organisms with similar characteristics and are capable of living with each other and breeding together freely. They give rise to young ones (offspring) that resembles the parents and can also breed with organisms of same species.

Examples of species include

- a group of lizards

- a group of human beings etc

A species is defined as a group of organisms that can mate

A species is a fundamental unit of biological classification. It comprises individuals that can interbreed and produce fertile offspring, sharing common characteristics. Species diversity is vital to biodiversity and plays a central role in ecology and evolutionary biology studies.

Thus, a species is a group of individual organisms that interbreed and produce fertile, viable offspring. According to this definition, one species is distinguished from another when, in nature, it is not possible for matings between individuals from each species to produce fertile offspring. This reproductive isolation is an important factor in defining species.

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Answer: 13.31 moles.

Explanation: So take 452 grams of Argon and multiply by the molar mass of Argon. Your units will cancel out, leaving you with moles of Argon.

Answer:

A

Explanation

The product side is on the right, FeO + H2. H represents hydrogen, the number after it is the sbscript, which indicates that there are two hydrogen atoms.

There are two atoms of hydrogen  in the product side of the balanced chemical equation.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

B

Explanation:

on edge

The second equation represents a fission reaction because a large atom splits into many smaller atoms along with  energy.

Fission reaction occurs when a larger atom split into two smaller atoms with the release of a tremendous amount of energy.

So we can conclude that the second equation represents a fission reaction because a large atom splits into many smaller atoms along with  energy.

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Answer: Acetylene : -1,256 kJ/mol

Ethanol : -1,277 kJ/mol

Explanation:

The enthalpy of combustion of acetylene is -1299 kJ/mol and the enthalpy of combustion of ethanol is -1367 kJ/mol.

To calculate the enthalpy of combustion of each substance, we need to use the equation:

ΔHcombustion = ΣΔHf(products) - ΣΔHf(reactants)

Where ΔHcombustion is the enthalpy of combustion, ΣΔHf(products) is the sum of the enthalpies of formation of the products, and ΣΔHf(reactants) is the sum of the enthalpies of formation of the reactants.

Using the enthalpies of formation (AH) given in the table, we can calculate the enthalpy of combustion of each substance:

Acetylene:

C₂H₂ + (5/2)O₂ → 2CO₂ + H₂O

ΔHcombustion = [2(-393.5) + (-241.8)] - [228.8] = -1299 kJ/mol

Ethanol:

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

ΔHcombustion = [2(-393.5) + 3(-241.8)] - [-235.1] = -1367 kJ/mol

Therefore, the enthalpy of combustion of acetylene is -1299 kJ/mol and the enthalpy of combustion of ethanol is -1367 kJ/mol.

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Answer:

the answer the gravity

Explanation:

Answer:

b

Explanation:

Final answer:

Balancing the provided chemical equation for the combustion of ethane results in a balanced equation with integer-only coefficients: 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O, showcasing the adherence to the law of conservation of mass.

Explanation:

The question involves balancing a chemical equation which is a fundamental skill in chemistry. The correct and balanced equation for the combustion of ethane (C2H6) in oxygen is as follows:

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

This equation demonstrates that when ethane (C2H6) combusts with oxygen (O2), it produces carbon dioxide (CO2) and water (H2O). Balancing a chemical equation ensures that there are an equal number of atoms for each element on both sides of the equation, adhering to the law of conservation of mass. This equation is balanced by ensuring there are equal numbers of carbon, hydrogen, and oxygen atoms on both reactant and product sides. After initial attempts that might lead to fractional coefficients, multiplying all coefficients by an appropriate factor to achieve integer-only coefficients is a commonly used strategy as illustrated by the multiplication of each coefficient by 2 in this case.

Answer:

there are billions, and more that we haven't yet explored, it is just let the sea only a lot more floaty!

hope this helps

Answer:

0.016M

Explanation:

First we find the mole of AgNO3 by using the formula mass/molar mass..

Then we find molarity by the formula mole/volume...

I hope you get this..

Answer:atom

Explanation: electron cloud

Answer:

[tex]2.5\cdot 10^6 Hz[/tex]

Explanation:

The relationship between the speed of a wave, its frequency and its wavelength is given by the wave equation:

[tex]v=f\lambda[/tex]

where

v is the wave speed

f is the frequency of the wave, which is the number of cycles completed by the wave in one oscillation

[tex]\lambda[/tex] is the wavelength, which is the distance between two consecutive crests of the wave

For the wave in this problem we have:

v = 5000 m/s is the speed

[tex]\lambda=0.002 m[/tex] is the wavelength of the wave

Solving for f, we find the frequency:

[tex]f=\frac{v}{\lambda}=\frac{5000}{0.002}=2.5\cdot 10^6 Hz[/tex]

Answer:

There are 2, 01 moles of helium in the container

Explanation:

We use the formula PV=nRT. We convert of pressure the unit kPa into atm:

101,325 kPa---1 atm

245   kPa   ----x= (245  kPa x 1 atm)/101,325 kPa=2,42 atm

PV= nRT  --->  n=PV/RT

n= 2, 42 atm x 21, 5 L/ 0,082 l atm /K mol  x315K

n=2, 012620871 mol

Answer:

[tex]39 ^\circ C[/tex]

Explanation:

Given,

V₁ = 18.5 L

T₁ = 18.5° C = 273 + 18.5 = 291.5 K

V₂ = 19.8 L

T₂ = ?

Pressure is constant

Using ideal gas equation

[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

[tex]\dfrac{18.5}{291.5}=\dfrac{19.8}{T_2}[/tex]

[tex]T_2 = 312 K[/tex]

[tex]T_2 = 312 -273 =39 ^\circ C[/tex]

The temperature when the chamber has a volume of 19.8 L should be considered as the 39 degrees.

Since

V₁ = 18.5 L

T₁ = 18.5° C = 273 + 18.5 = 291.5 K

V₂ = 19.8 L

So here the final temperature should be

V1/T1 = V2/T2

18.5 L/291.5 = 19.8 / T2

So T2 = 312 k

= 312 - 273

= 39 degrees

hence, The temperature when the chamber has a volume of 19.8 L should be considered as the 39 degrees.

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Answer:

388.5

Explanation:

[tex] \frac{555}{32} = 17.34375 \\ 17.34375 \times 22.4 = 388.5 [/tex]

Lighting the candle on a double-pan mechanical balance will cause the balance to tilt as the candle loses mass due to combustion, favoring the side with the unburned weights.

When a candle placed on one pan of a double-pan mechanical balance is lit, and an equal weight is on the other pan, the balance will be disrupted over time. As the candle burns, it loses mass primarily through the combustion process, which converts wax into gases like carbon dioxide and water vapor that are released into the air. As a result, the mass in the candle's pan decreases, causing the balance to tilt favoring the side with the unburned weights, typically metal cylinders of standard mass.

To determine the number of moles of glucosamine in a 1,000 mg dose, first calculate the molar mass of glucosamine (C6H13NO5), which is approximately 179.17 g/mol. Then convert the dose to grams (1,000 mg equals 1 g) and divide by the molar mass to find that the patient takes 0.00559 moles of glucosamine per day.

To calculate how many moles of glucosamine a patient takes each day when prescribed 1,000 mg of glucosamine, we need to first determine the molar mass of glucosamine. Glucosamine has a chemical formula of C6H13NO5, so we will sum the atomic masses of its constituent elements: Carbon (C), Hydrogen (H), Nitrogen (N), and Oxygen (O). The molar mass of one mole of glucosamine can be found by adding the molar masses of 6 carbons (≈13.01 g/mol), 13 hydrogens (≈1.01 g/mol), one nitrogen (≈14.01 g/mol), and five oxygens (≈16.00 g/mol), which equals approximately 179.17 g/mol. Next, we convert the prescribed dose from milligrams to grams: 1,000 mg = 1 g. Lastly, we divide the mass of glucosamine in grams by its molar mass in grams per mole to calculate the number of moles.

1 g / 179.17 g/mol = 0.00559 moles (or 5.59×10⁻³ moles), which is the amount of glucosamine the patient takes each day.

Answer:

There should be the refraction for light to change a material.

Answer: change in speed

Explanation: the change in speed causes light Ray's to change direction. This directional change is called refraction.

Answer:

V₁  = 10 mL

Explanation:

Given data:

Initial volume of HCl = ?

Initial molarity = 3.0 M

Final molarity = 0.10 M

Final volume = 300.0 mL

Solution:

Formula:

M₁V₁  =  M₂V₂

M₁ = Initial molarity

V₁  =  Initial volume of HCl

M₂ =Final molarity

V₂ = Final volume

Now we will put the values.

3.0 M ×V₁  =  0.10 M×300.0 mL

3.0 M ×V₁  = 30 M.mL

V₁  = 30 M.mL /3.0 M

V₁  = 10 mL

Final answer:

The hydrologic or water cycle is the term for the movement of water between the ground, atmosphere, and bodies of water. It occurs through processes like evaporation, transpiration, condensation, precipitation, surface runoff, and groundwater flow, primarily driven by solar energy and gravity.

Explanation:

The movement of water between the ground, the atmosphere, and bodies of water is called the hydrologic cycle or water cycle. This cycle describes the continuous movement of water as it is evaporated from surfaces like rivers, lakes, and oceans into the atmosphere, forms clouds, precipitates as rain or snow, and returns to the surface. The cycle is driven by solar energy and gravity, moving water through various states: liquid, solid (ice), and vapor.

Water reaches the atmosphere through evaporation, transpiration (from plants), and sublimation (ice to water vapor). It returns as precipitation and may flow over the land as surface runoff or infiltrate into the ground to become groundwater, which slowly moves and can discharge into other bodies of water or return to the ocean.

Answer:

Mass = 14.64 g

Explanation:

Given data:

Volume of solution = 1.25 L

Molarity of Solution = 0.15 M

Mass of CaF₂ = ?

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

We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.

0.15 M =  number of moles of solute / 1.25 L

number of moles of solute = 0.15 M ×  1.25 L

number of moles of solute = 0.1875 mol/L × L

number of moles of solute = 0.1875 mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.1875 mol ×78.07 g/mol

Mass = 14.64 g

The Mass of CaF₂ is 14.64 g. Molarity is the ratio of number of moles over the volume of solution.

Given:

Volume of solution = 1.25 L

Molarity of Solution = 0.15 M

To find:

Mass of CaF₂ = ?

Molarity is used to describe the concentration of solution. It is given by number of moles divided by volume of solution in litres.

Molarity = number of moles of solute / L of solution

We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.

0.15 M =  Number of moles of solute / 1.25 L

Number of moles of solute = 0.15 M *  1.25 L

Number of moles of solute = 0.1875 mol/L * L

Number of moles of solute = 0.1875 mol

Calculation of mass:

Mass = number of moles / molar mass

Mass = 0.1875 mol *78.07 g/mol

Mass = 14.64 g

Thus, the mass of CaF₂ is 14.64 grams.

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Answer:

ye

Explanation:

help

Answer:

The concentrations of the products and reactants do not change.

Explanation:

The following information is missing:

If the reaction is at dynamic equilibrium at 500 K, which statement applies to the given chemical system?

Dynamic equilibrium means that the rate of the forward and reverse reactions are equal and different from zero. Then, the concentrations of the products and reactants do not change.

Answer:

c

Explanation: