What is the mass, in grams, of a pure iron cube that has a volume of 4.80 cm3?

Answer:

1. 176 × 10^12 W ; 78400000000

Explanation:

Given the following :

Fall rate = 2,400,000kg/s

Average height of fall = 50m

Gravitational Potential of falling water = mgh = mass × acceleration due to gravity × height =

How many 15 W LED light bulbs could it power?

Recall : power = workdone / time

Workdone = gravitational potential energy

Mass of water = density * volume

Density of water = 1 * 10^3kg/m^3

Rate of fow = volume / time = 2400000

Hence,

Power = 1000 * 2,400,000 * 9.8 * 50

Power = 1176000000000

Power = 1. 176 × 10^12 W

How many 15 W LED light bulbs could it power?

1176000000000 / 15 = 78400000000

= 78400000000 15 W bulbs

Answer:

its letter D Energy I think

Answer:

1. Which people are in the control group? The people who received the mint without the secret ingredient

(Group B) would be the control group.

2. What is the independent variable? Secret ingredient in the breath mint

3. What is the dependent variable? Amount of breath odor (or bad breath)

4. What should Mr. Krabs’ conclusion be? The breath mint with the secret ingredient appears to reduce the

amount of breath odor more than half the time, but it is not 100% effective.

5. Why do you think 10 people in group B reported fresher breath? This may be due to the placebo effect.

Answer:

The element rubidium forms a cation with a charge of +1. The symbol of this ion is Rb+, and the name is rubidium ion. The number of electrons in this ion is 36 electrons

Explanation:

Rubidium belongs to the group 1A of the periodic table of elements. It is an alkali metal. The rubidium atom has an atomic number of 37. The neutral atom also has 37 electrons.

Being a metal, it forms ions by the loss of electrons. Since it is an alkali metal, it has one valence shell electron. It loses this one electron to form the rubidium ion, Rb+ which then has 36 electrons.

Answer:

A.

Explanation:

Neon 19 is shown on image A.

Diagram  A shows the correct model for an atom neon.

The arrangement of elements by their periodic properties and physical and chemical characteristic make a periodic table.

The chemical and physical properties of the group of the element belongs to Alkali Metals, Less dense, One loosely bound valence electron, Highly reactive, Low ionization energy, Low electronegativity

The lanthanides and actinides are also transition metals, these are softer and nonmetallic properties, all of these elements tend to have a shiny, metallic appearance, radioisotopes of other elements, actinides are radioactive.

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Answer:

[tex]m=1.325gNa_2CO_3[/tex]

Explanation:

Hello,

In this case, by considering the given seminormal solution, we infer it is a 0.5-N solution which means that we can obtain the equivalent grams as shown below for the 55 cc (0.055 L) volume:

[tex]eq-g=0.5eq-g/L*0.050L=0.025eq-g[/tex]

Next, since sodium carbonate has two sodium ions with a +1 oxidation state each, we can obtain the moles:

[tex]mol=0.025eq-gNa_2CO_3*\frac{1molNa_2CO_3}{2eq-gNa_2CO_3}\\ \\mol=0.0125molNa_2CO_3[/tex]

Finally, the mass is computed by using its molar mass (106 g/mol)

[tex]m=0.0125molNa_2CO_3*\frac{106gNa_2CO_3}{1molNa_2CO_3} \\\\m=1.325gNa_2CO_3[/tex]

Regards.

Answer:

1.

Explanation:

Hello,

In this case, for the given reaction we first assign the oxidation state for each species:

[tex]Sn^0 + H^+N^{5+}O^{-2}_3 \rightarrow Sn^{4+}O_2 + N^{4+}O^{2-}_2 + H^+_2O^-[/tex]

Whereas the half reactions are:

[tex]Sn^0+2H_2O \rightarrow Sn^{4+}O_2 +4H^++4e^-\\\\H^++H^+N^{5+}O^{-2}_3 +1e^-\rightarrow N^{4+}O^{2-}_2+H_2O[/tex]

Next, we exchange the transferred electrons:

[tex]1\times(Sn^0+2H_2O \rightarrow Sn^{4+}O_2 +4H^++4e^-)\\\\4\times (H^++H^+N^{5+}O^{-2}_3 +1e^-\rightarrow N^{4+}O^{2-}_2+H_2O)\\\\\\Sn^0+2H_2O \rightarrow Sn^{4+}O_2 +4H^++4e^-\\\\4H^++4H^+N^{5+}O^{-2}_3 +4e^-\rightarrow 4N^{4+}O^{2-}_2+4H_2O[/tex]

Afterwards, we add them to obtain:

[tex]Sn^0+2H_2O+4H^++4H^+N^{5+}O^{-2}_3 \rightarrow Sn^{4+}O_2 +4H^++4N^{4+}O^{2-}_2+4H_2O[/tex]

By adding and subtracting common terms we obtain:

[tex]Sn^0+4H^+N^{5+}O^{-2}_3 \rightarrow Sn^{4+}O_2 +4N^{4+}O^{2-}_2+2H_2O[/tex]

Finally, by removing the oxidation states we have:

[tex]Sn + 4HNO_3 \rightarrow SnO_2 + 4NO_2 + 2H_2O[/tex]

Therefore, the smallest whole-number coefficient for Sn is 1.

Regards.

Answer:

1qt is the same as 946.35mL

Explanation:

4.80 US liquid quart is equal to 4542. 49 mL.

A quart is a unit for capacity used in the Imperial British and the U.S. Customary systems of measurement. It is used for both liquid and dry measurements, one standard quart is used in the British system. This is equal to two imperial pints, or one-fourth of the imperial gallon.

This is 69.36 cubic inches or 1,136.52 cubic cm. The U.S. system of measurements has two units for a quart. One is used for the liquid measurements and a slightly larger unit is used for the dry measurements.

The U.S. liquid quart unit is equal to two liquid pints, or one-fourth U.S. gallon. This is 57.75 cubic inches or 946.35 cubic cm. The dry quart is equal to two dry pints, or 1/32 bushel. This is 67.2 cubic inches or 1,101.22 cubic cm.

In this case, 1 US quart = 946.353 ml

So, 4.80 liquid quart = 4542.49 ml.

Therefore, 4.80 US liquid quart is equal to 4542. 49 mL.

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Answer:

The water is completely vaporized at this stage.

Explanation:

The complete question is

If 5.0 kJ of energy is added to a 15.5-g sample of water at 10.°C, the water is

-boiling

-completely vaporized

-frozen solid

-decomposed

-still a liquid

Energy added = 50 kJ = 50000 J

mass of water = 15.5 g = 0.0155 kg

temperature of water = 10 °C

We know that the energy posses by a mass of water at a given temperature is given as

H = mcT

where H is the energy possessed by the mass of water

m is the mass of the water

c is the specific heat capacity of water = 4200 J/ kg- °C

T is the temperature of the water

substituting values, the energy of this amount of water is

H = 0.0155 x 4200 x 10 = 651 J

If 50 kJ is added to the water, the energy increases to

50000 J + 651 J = 50651 J

Temperature of this water at this stage will be gotten from

H = mcT

we solve for the new temperature

50651 = 0.0155 x 4200 x T

50651 = 65.1 x T

T = 50651/65.1 = 778.05 °C

This temperature is well over 100 °C, which is the vaporization temperature of water, but less than 3000 °C for its molecules to decompose.

Answer:

3.25 kcal has the same amount of energy as 13600 J

Answer:

Explanation:

Density of a substance can be found by using the formula

From the question

mass = 90 g

volume = 30 mL

Substitute the values into the above formula and solve for the Density

That's

We have the final answer as

Hope this helps you

Answer:

Molar mass = 12.51 g/mol

Explanation:

V = 3L

P = 1.25 atm

T = 20 C = 20 + 273 = 293 K (Upon conversion to kelvin temperature)

n =?

m = 1.95g

Molar mass = ?

The variables are related by the follwing equation;

pV = nRT

where r = gas constant = 0.0821 L atm K−1

Solving for n, we have;

n = pV / RT

n = (1.25 * 3 ) / (0.0821 * 293)

n = 3.75 / 24.0553 = 0.1559 mol

The relationship between number of moles, n and molar mass is given as;

n = mass / molar mass

Molar mass = Mass / n = 1.95 / 0.1559

Molar mass = 12.51 g/mol

Answer:

See explanation

Explanation:

For sulphur dioxide;

3.53 g of sulphur combines with 3.52 g of oxygen

1.00 g of sulphur combines with 1.00 × 3.52/ 3.53 = 0.997 g

For sulphur trioxide

6.00 of sulphur combines with 9.00 g of oxygen

1.00 g of sulphur combines with 1.00 × 9.00/6.00 =1.5 g

Ratio of mass of oxygen;

1 : 1.5

The law of multiple proportions states that, if two elements A and B combine to form more than one chemical compounds, then the various masses of element A which combines separately with a fixed mass of element B are in simple multiple ratio.

We can see that the mass of oxygen which combines separately with sulphur in sulphur dioxide and sulphur trioxide are in simple ratio of 1:1.5.

Answer:

The neutral organic product is Imine.

Explanation:

From the image attached below, we will see an organic compound the question intended us to work out.

The proposed reaction is between cyclohexane and a stick structure of butylamine to yield imine as the product. The stepwise process and the mechanism carried out to get the product  of this reaction is also shown in the image attached below.

Answer:

244/242 alright

Explanation:

yesss

Answer:

244/242 or 1.00826446 g/mL

Explanation:

Density can be calculated using the following formula.

d=m/v

where m is the mass and v is the volume.

The mass is 244 grams and the volume is 242 milliliters.

m= 244 g

v= 242 mL

Substitute the values into the formula.

d= 244 g / 242 mL

Divide 244 g by 242 mL.

d= 244/242 g/mL

d= 1.00826446 g/mL

The density is 244/242 or 1.00826446 grams per milliliter.

Answer:

The building block that makes up all matter in the universe is atoms.

Answer:

0.15 L

Explanation:

You need to first find the volume of the container.  You can do this by dividing the mass by the density.  This will give you the mass in mL.

5.00 kg = 5,000 g

(5,000 g)/(1.00 g/mL) = 5,000 mL

5,000 mL = 5 L

Now, find the volume the seawater will take up.

(5,000 g)(1.03 g/mL) = 4854.4 mL

4854.4 mL = 4.85 L

Subtract the two volumes to find the volume that left unfilled.

5 L - 4.85 L = 0.15 L

Answer:

1

Explanation:

Pyridine is a six membered hetrocyclic aromatic compound. Oxidation of the pyridine ring occurs at position-1.

Just like benzene, pyridine is stable towards mild oxidizing agents, however, pyridine is oxidized by peracetic acid to yield pyridine N-oxide.

Answer:

13,3875 minutes or 2,231.25 hours

Explanation:

153 x 25 = 3,825

person x lab paper = all the lab papers turned in.

35 x 3,825 = 13,3875

minutes x all the lab papers turned in = amount of minutes spent on grading

Answer:

The correct answer is : 6 electrons

Explanation:

From the reduction-oxidation reaction, we identify the half-reactions:

Oxidation reaction: Cr (oxidation number= 0)  loses 3 electrons and forms the cation Cr³⁺.

Cr → Cr³⁺ + 3 e-

Reduction reaction: the cation Ni²⁺ gains 2 electrons to form Ni (oxidation number= 0).

Ni²⁺ + 2 e- → Ni

We write the two half-reactions together and we multiply the reduction reaction by 3 and the oxidation reaction by 2 to obtain the same quantity of electrons in each half-reaction: 6.

(Ni²⁺ + 2 e- → Ni) x 3

(Cr → Cr³⁺ + 3 e-) x 2

-------------------------------

3 Ni²⁺ + 2 Cr → 3 Ni + 2 Cr³⁺ (balanced reaction)

Therefore, in the balanced reaction a total of 6 electrons are transferred.

Answer:

corrected pressure : unknown 1 = 2.452 Atm,  unknown 2 = 1.088 atm

number of moles : unknown 1 =  0.079 moles unknown 2 =  0.035263 moles

Explanation:

Given data:

volume pressure = 0.785 liters

Unknown 1 = 1884 torr  (1884 mmhg )

Unknown 2 = 847 torr  ( 847 mmhg )

vapor pressure at 22⁰c = 19.8 mmhg

Determine the number of moles of H2 gas  for the unknowns

unknown corrected pressure for unknown 1 = total pressure - vapor pressure    = 1884 - 19.8 = 1864.2 mmhg / 760 = 2.452 Atm

no of moles = PV / RT

T = 22 + 273.15 = 295.15 k

P = 2.452 atm

R = 0.08206L.atm/mole.K

v = 0.785

number of moles = (2.452 * 0.785 ) / (0.08206 * 295.15 ) = 0.079 moles of

Unknown corrected pressure for unknown 2 = total pressure - vapor pressure  = (847 - 19.8 ) / 760 = 1.088 atm

number of moles = PV / RT

T = 22 + 273.15 = 295.15 k

R = 0.08206L.atm/mole.K

v = 0.785

P = 1.088 atm

number of moles = (1.088 * 0.785 ) / (0.08206 * 295.15 ) = 0.035263 moles

B ) determine the ratio of sample mass to number of moles

molar mass of H2 = 2.01588 g/mole

for unknown 1 = 2.01588 /  0.079 = 25.51

for unknown 2 = 2.01588 / 0.035263 = 57.167

Answer:

O sólido tem densidade mais alta em comparação ao líquido.

Explicação:

A densidade da amostra sólida é maior do que a densidade do líquido porque há pouco espaço entre as partículas do sólido. A densidade tem relação inversa com o volume de uma substância, se uma substância ocupa mais espaço então sua densidade é menor, enquanto se a substância ocupa menos espaço então tem maior densidade. As substâncias sólidas ocupam menos espaço em comparação com as substâncias líquidas, então podemos dizer que a densidade do sólido é maior do que as substâncias líquidas.

Answer:

Explanation:

Mechanical energy = Gravitational potential energy + kinetic energy

Time            Gravitational potential energy        kinetic energy         Total ME

0                                    4                                                0                        4

2                                     2                                               2                        4

4                                     0                                               4                        4

6                                     2                                               2                        4

8                                     4                                               0                        4

and so on  .....

We see that total mechanical energy is always 4 which is constant .

So gravitational and kinetic energy changes cyclically but total mechanical energy is constant .

Answer:

C. in the chemical wastebasket

Answer:

a) When limestone is heated in a kiln, the calcium carbonate breaks down into calcium oxide and carbon dioxide. This type of reaction is called thermal decomposition. The process is called calcining. ... Slaked lime is used to reduce the acidity of the soil, which helps increase its fertility.

b) Mechanical digestion occurs in the mouth, stomach, and small intestine. Food is chemically changed indigestion when new, smaller substances are formed. These chemical changes are examples of chemical digestion. Chemical digestion begins in the mouth when enzymes in saliva begin to break down carbohydrates.

c)  Copper is a ductile metal. This means that it can easily be shaped into pipes and drawn into wires. Copper pipes are lightweight because they can have thin walls. They don't corrode and they can be bent to fit around corners.

d)  Ripening of fruits is a chemical change. During ripening the pigment present in the skin of the fruit changes and this can not be reversed back. it is a chemical change as once a fruit ripens it cannot turn raw again.

e)  Ice is a unique substance because it is solid-state — ice — is less dense than its liquid state. Because of this property, ice floats in water. Physical properties are characteristics of a substance. They do not change. Physical properties include colour, smell, freezing/melting point, and density.

Answer:

[tex]m_{air}=3.6g[/tex]

Explanation:

Hello,

In this case, given the law of conservation of mass which states that mass cannot be created nor destroyed, since the produced mass of the compound is 15.9 g and the mass of the initial substance is 12.3 g we obtain the mass of air by applying the following equation:

[tex]m_{reactants}=m_{products}\\\\m_{substance}+m_{air}=m_{product}[/tex]

Thus, solving for the mass of air we obtain:

[tex]m_{air}=m_{product}-m_{substance}\\\\m_{air}=15.9g-12.3g\\\\m_{air}=3.6g[/tex]

Regards.

Answer:

a) Reactants are being consumed at the same rate they are being produced.

Explanation:

In a chemical reaction, chemical equilibrium is a state in which there is no change in concentration of the reactant and product. This means that as the reactants are consumed, they are also produced. Same thing with the products; immediately they are formed, they are consumed.

The option that accurately depicts a reaction at equilibrium is;

a) Reactants are being consumed at the same rate they are being produced.

Answer:

[tex]30.0\frac{lb}{L}[/tex]

Explanation:

Hello,

In this case, since 454 g are equivalent to 1 pound and 1000 millilitres are equivalent to 1 liter, the required density is computed below by applying the corresponding conversion factor:

[tex]=13.6\frac{g}{mL} *\frac{1lb}{454g} *\frac{1000mL}{1L} \\\\=30.0\frac{lb}{L}[/tex]

Regards.

Answer:

no

Explanation:

light objects float

Given :

Initial mass , a = 150 gm .

Half time ,

[tex]t_{\dfrac{1}{2}}=36 \ hours[/tex].

Final mass , x = 18.75 gm .

To Find :

The time taken to decay 18.75 gm .

Solution :

We know , time taken is given by :

[tex]t=\dfrac{1}{k}\times ln(\dfrac{a}{a-x})[/tex]

Here , k is a constant given by :

[tex]k=\dfrac{0.693}{t_{\dfrac{1}{2}}}\\\\\\k=\dfrac{0.693}{36}[/tex]

Putting all given value in above equation :

We get :

[tex]t=\dfrac{36}{0.693}\times ln(\dfrac{150}{150-18.75})\\\\t=6.94\ hours[/tex]

Therefore , time taken is 6.94 hours .

Hence , this is the required solution .