Categories
Assignment Help

The equilibrium of 2H2O( g. 2H2( g. + O2( g. at 2,000 K has a Keq value of 5.31 x 10-10. What is the mass action expression for this system?

[ad_1]

The equilibrium of 2H2O( g. 2H2( g. + O2( g. at 2,000 K has a Keq value of 5.31 x 10-10. What is the mass action expression for this system?

[ad_2]

Categories
Assignment Help

. What is the mass, in grams, of a sample of 7.83 × 1024 atoms of helium (He)?

[ad_1]

. What is the mass, in grams, of a sample of 7.83 × 1024 atoms of helium (He)?

[ad_2]

Categories
Assignment Help

According to the law of conservation of mass, in a chemical reaction, the mass of the reactant will always be different from the mass of the product. True Or False

[ad_1]

According to the law of conservation of mass, in a chemical reaction, the mass of the reactant will always be different from the mass of the product. True Or False

[ad_2]

Categories
Assignment Help

Which subatomic particle has virtually no mass but accounts for the volume of the atom?

[ad_1]

Which subatomic particle has virtually no mass but accounts for the volume of the atom?

[ad_2]

Categories
Assignment Help

For a mass hanging from a spring, the maximum displacement the spring is stretched or compressed from its equilibrium position is the system’s a. amplitude. c. frequency. b. period. d. acceleration

[ad_1]

For a mass hanging from a spring, the maximum displacement the spring is stretched or compressed from its equilibrium position is the system’s a. amplitude. c. frequency. b. period. d. acceleration

[ad_2]

Categories
Assignment Help

If a force of 20 N is applied to an object with a mass of 3 kg, the object will accelerate at m/s2

[ad_1]

If a force of 20 N is applied to an object with a mass of 3 kg, the object will accelerate at m/s2

[ad_2]

Categories
Assignment Help

Which of the following particles has mass? a. protons only b. electrons only c. both protons and electrons

[ad_1]

Which of the following particles has mass? a. protons only b. electrons only c. both protons and electrons

[ad_2]

Categories
Assignment Help

Electrons contribute ______________ charge and ______________ mass to the atom. a.negative, a lot of b. little, a lot of c.negative, little

[ad_1]

Electrons contribute ______________ charge and ______________ mass to the atom. a.negative, a lot of b. little, a lot of c.negative, little

[ad_2]

Categories
Assignment Help

The mass of the products in a reaction is always _______ when compared to the mass of the reactants in a reaction. greater lower equal inversely proportionate

[ad_1]

The mass of the products in a reaction is always _______ when compared to the mass of the reactants in a reaction. greater lower equal inversely proportionate

[ad_2]

Categories
Assignment Help

Which of the following best summarizes the law of conservation of mass? a. Matter can be changed but not created or destroyed. b. Matter can be destroyed during a chemical reaction. C. Matter that gains mass during a chemical reaction is evidence that matter can be created.

[ad_1]

Which of the following best summarizes the law of conservation of mass? a. Matter can be changed but not created or destroyed. b. Matter can be destroyed during a chemical reaction. C. Matter that gains mass during a chemical reaction is evidence that matter can be created.

[ad_2]

Categories
Assignment Help

The Force Of Gravity Acting On A Childs Mass On Earth Is 490 newtons whats the childs mass

[ad_1]

Answered by answersmine AT 22/10/2019 – 03:21 AM

Force of gravity on an object is the weight of the object and is given by mass times accerelation due to gravity. The accerelation due to gravity is the accerelation of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child’s mass on earth is 490 newtns, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.

Post your answer

[ad_2]

Categories
Assignment Help

What is the density of a block of aluminum that has mass 27 grams of and a volume 10 cm3? 2.7 g/cm3 270 g/cm3 0.37 g/cm3 0.37 cm3/g

[ad_1]

What is the density of a block of aluminum that has mass 27 grams of and a volume 10 cm3? 2.7 g/cm3 270 g/cm3 0.37 g/cm3 0.37 cm3/g

[ad_2]

Categories
Assignment Help

How is mathematics used to study space? It is used to determine distances in space It is used to determine the size of objects in space It is used to determine the mass of objects in space All of these

[ad_1]

How is mathematics used to study space? It is used to determine distances in space It is used to determine the size of objects in space It is used to determine the mass of objects in space All of these

[ad_2]

Categories
Assignment Help

What mass of manganese(II) chloride must react with sulfuric acid to release 48.5 mL of hydrogen chloride gas at STP? MnCl2(s)+H2SO4(aq)→MnSO4(aq)+2HCl(g)

[ad_1]

Note that one mole of any gas at STP occupies 22.4 L of volume. We may use this to calculate the moles of hydrogen chloride gas that need to be produced. This is:
0.0485 / 22.4
0.002 mol

Next, we see that the molar ratio between manganese chloride and hydrogen chloride in the equation is:
1 : 2

So the moles of manganese chloride reacting will be:
0.002 / 2 = 0.001 mol

The molecular mass of manganese chloride is 126 g/mol. The mass reacting will be:
0.001 * 126

0.126 grams of manganese (II) chloride will react. 

[ad_2]

Categories
Assignment Help

In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen (77 k) was discovered. the approximate formula of this substance is yba2cu3o7. calculate the percent composition by mass of this material.

[ad_1]

 

The molar mass of the elements are:

Yttrium (Y) = 88.91 g / mol

Barium (Ba) = 137.33 g / mol

Copper (Cu) = 63.55 g / mol

Oxygen (O) = 16 g / mol

 

Calculating for the molar mass of YBa2Cu3O7:

YBa2Cu3O7 = 88.91 + 2(137.33) + 3(63.55) + 7(16) = 666.22
g / mol

 

The masses of the elements in 1 mole of YBa2Cu3O7 are:

Yttrium (Y) = 88.91 g / mol (1 mole) = 88.91 g

Barium (Ba) = 137.33 g / mol (2 mole) = 274.66 g

Copper (Cu) = 63.55 g / mol (3 mole) = 190.65 g

Oxygen (O) = 16 g / mol (7 mole) = 112 g

 

We now calculate for the percent composition by mass of
each element:

% Y
= 88.91 g / 666.22 g = 13.35%


% Ba
= 274.66 g / 666.22 g = 41.23%


%Cu
= 190.65 g / 666.22 g = 28.62%


%O =
112 g / 666.22 g = 16.81%

[ad_2]

Categories
Assignment Help

The brain mass of a fetus can be estimated using the total mass of the fetus by the function b equals 0.22 m superscript 0.87b=0.22m0.87?, where m is the mass of the fetus? (in grams) and b is the brain mass? (in grams). suppose the brain mass of a 2323?-g fetus is changing at a rate of 0.240.24 g per day. use this to estimate the rate of change of the total mass of the? fetus, startfraction dm over dt endfraction dm dt.

[ad_1]

We are given
b = 0.22 m^0.87
db/dt = 0.24 g/day at b = 23 g

where
b is the brain mass of the fetus
m is the total mass of the fetus
db/dt is the rate of change of the brain mass of the fetus

We are asked to get the rate of change of the total mass of the fetus

First, we take the first derivative of the given equation with respect to time
db/dt = 0.22 (0.87) m^(0.87-1) dm/dt
Next, simplify and substitute the given values. So,
0.24 g/day = 0.22(0.87)(23)^(0.87 -1 ) dm/dt
Solving for dm/dt
dm/dt = 1.88 g/day

The rate of change of mass of the fetus is 1.88 g/day.

[ad_2]

Categories
Assignment Help

True or false, both mass spectrometry and infrared spectroscopy involve the interaction of molecules with electromagnetic energy

[ad_1]

Answered by answersmine AT 22/10/2019 – 04:48 AM

Yes, it is true, both mass spectrometry and infrared spectroscopy involve interaction of molecules with electromagnetic waves. ;Mass spectrometry method is used to determine the mass of a substance while infrared spectroscopy is used to determine the functional groups in molecules. Both methods involve the analysis of electromagnetic light interaction with molecules. 

Post your answer

[ad_2]

Categories
Assignment Help

1. What was Truman’s plan for the American people called? Square Deal Dynamic Liberalism Fair Deal Dynamic Conservatism 2. John F. Kennedy’s religious beliefs were an important issue of the 1960 presidential campaign. True False 3. What group was headed by Elijah Muhammad? Black Power Black Panthers Nation of Islam none of the above 4. Because Kennedy was elected by a slim margin, he lacked a popular mandate. True False 5. What seems to have been the chief purpose(s) of mass media during the 1950s? A. to entertain B. to sell products both a and b neither a nor b

[ad_1]

1. What was Truman’s plan for the American people called? Square Deal Dynamic Liberalism Fair Deal Dynamic Conservatism 2. John F. Kennedy’s religious beliefs were an important issue of the 1960 presidential campaign. True False 3. What group was headed by Elijah Muhammad? Black Power Black Panthers Nation of Islam none of the above 4. Because Kennedy was elected by a slim margin, he lacked a popular mandate. True False 5. What seems to have been the chief purpose(s) of mass media during the 1950s? A. to entertain B. to sell products both a and b neither a nor b

[ad_2]

Categories
Assignment Help

A 47.3 ml sample of alcohol has a mass of 37.32 g. what is its density in g/ml?

[ad_1]

A 47.3 ml sample of alcohol has a mass of 37.32 g. what is its density in g/ml?

[ad_2]

Categories
Assignment Help

White gold is an alloy that typically contains 45.0% by mass gold and the remainder is platinum. if 154 g of gold are available, how many grams of platinum are required to combine with the gold to form this alloy?

[ad_1]

Percent by mass of platinum in white gold = 100% – 45% = 55%

We let x be the mass of the white which is 45% gold and 55% platinum. 

Mass of gold in white gold = m x 0.45

where m is the total mass.

From the given above, we formulate the equation that would allow us to determine the mass of white gold.
                            154 = x (0.45)
                                     x = 342.22 g

Then, we determine the amount of platinum.
                     mass of platinum = (342.22 g)(0.55)
                      mass of platinum = 188.22 grams

Thus, 188.22 grams of platinum is needed. 

[ad_2]

Categories
Assignment Help

What hanging mass will stretch a 2.1-m-long, 0.43 mm – diameter steel wire by 1.5 mm ? the young’?s modulus of steel is 20×1010n/m2. express your answer using two significant figures?

[ad_1]

The force (weight) due to the hanging mass is
F = mg
where
m = mass, kg
g = 9.8 m/s²

The cross sectional area of the wire is
A = (π/4)*(0.43×10⁻³ m)² = 1.4522×10⁻⁷ m²

The stress in the wire is
σ = F/A = (9.8m N)/(1.4522×10⁻⁷ m²) = 6.7484×10⁷m Pa

The length of the wire is 2.1 m and the extension is 1.5 mm. Therefore the induced strain is
ε = (1.5×10⁻³ m)/(2.1 m) = 7.1429×10⁻⁴

By definition, Young’s modulus is E = σ/ε. Therefore
(6.7484×10⁷m Pa)/(7.1429×10⁻⁴) = 20×10¹⁰ Pa
9.4477×10¹⁰m = 20×10¹⁰
m = 2.117 kg 

Answer: 2.12 kg (to two sig. figures)

[ad_2]

Categories
Assignment Help

In the middle ages, the catholic church predominated in almost every aspect of life, and the catholic mass was an integral part of church activities. did the catholic church, particularly the mass, have any impact on music? how?

[ad_1]

Answered by answersmine AT 22/10/2019 – 05:08 AM

It did affect music. Church music was the highest form of music and people who wrote music for church were the highest of artists and they usually sang about religious things. Secular music was different and included things like dancing or witty lyrics and sometimes the church even tried to ban it because it was considered to be blasphemous.

[ad_2]

Categories
Assignment Help

A playground merry-go-round has a mass of 120 kg and a radius of 1.80 m and it is rotating with an angular velocity of 0.500 rev/s. what is its angular velocity (in rev/s) after a 22.0 kg child gets onto it by grabbing its outer edge? the child is initially at rest.

[ad_1]

To answer this problem, we must remember that momentum is
conserved. Therefore,

Initial momentum = Final momentum

In this case we use angular momentum which it is defined
as:

Momentum =0.5 m ω^2

So finding for final angular velocity, ωf:

mi * ωi^2
= mf * ωf^2

120 kg * (0.5 rev / s)^2 = (120 kg + 22 kg) * ωf^2

ωf^2
= 0.2113

ωf = 0.46 rev/s

[ad_2]

Categories
Assignment Help

_________ is the body mass attributed to non-fat body components, such as bone, muscle, and internal organs.

[ad_1]

Answered by answersmine AT 22/10/2019 – 05:22 AM

Lean body mass is the body mass attributed to non-fat body components, such as bone, muscle, and internal organs. In general, lean body mass is the mass of the body excluding the fat. It is important in fitness regimes. Most body builders want to maintain their lean body mass and decrease their body fat. 

Post your answer

[ad_2]

Categories
Assignment Help

A 60.0-kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by an ideal stiff spring of negligible mass. the platform drops 6.00 cm before the person comes to rest. what is the spring constant of the spring?

[ad_1]

Draw a diagram to illustrate the problem s shown in the figure below.

At state A, the person has potential energy relative to the spring of
PE = (60 kg)*(9.8 m/s²)*(1.2 m)
     = 705.6 J

At state B, the PE is converted to kinetic energy which is equal to the potential energy.
Assume that aerodynamic losses are ignored during the free fall.

At state C, the potential energy (or kinetic energy) is converted into strain energy in the spring. Assume that energy losses are negligible.
The spring deflects by  6 cm = 6×10⁻² m, and its spring constant = k N/m.
Therefore
(1/2)(k N/m)(6×10⁻² m)² = 705.6 J
k = 705.6/0.03 = 23520 N/m = 23.52 kN/m

Answer: 23.52 kN/m

[ad_2]