If an engineer's greatest concern is specific impulse, which type of fuel should she use?

A. Gaseous fuel
B. Solid fuel
C. Combustible fuel
D. Liquid fuel

Answer:

1. One is more compact than the next hence more density

2. A: 0.67g/cm3 hence will sink

B:0.56g/cm3 hence will sink

C:0.91g/cm3 hence will sink

Explanation:

Use the formula mass/volume to find its density with S.I unit is g/cm3

And to determine weather or not it sink use the relative density formula

Density of substance / Density of water

Answer:

81 °C

Explanation:

I don’t know, I just know :)

Answer:

I believe the answer is C.

Answer:

C

Explanation:

green house gases effects increases global warming

From the equation, [tex]\frac{p1 * v1}{t1} = \frac{p2 * v2}{t2}[/tex], we make v2 the subject of the formula, so that gives us: [tex]\frac{p1 * v1 * t2}{p2 * t1}[/tex]

Standard temperature = 273k

Standard pressure = 1atm

Plugging in our values, [tex]\frac{1.8 * 4.5 * 273}{1 * 140} = \frac{2211.3}{140} = 15.795 litres[/tex]

Answer:

1 mole of CO2 and 2 mole H2O will be produced in the reaction.

Explanation:

N:B: I guess it will be 6 moles of O2 not CO2.

Balanced Equation: CH4 + 2O2 --> CO2 + 2H2O

Given,

1 mole CH4

6 moles of O2

According to Stoichiometry,

In the reaction,

 2 mole O2 reacts with 1 mole CH4

 1 mole O2 reacts with 1/2 mole CH4

∴6 mole O2 reacts with (1/2)*6 mole CH4

                                      = 3 moles of CH4

But, there is only 1 mole CH4 provided. So CH4 is the limiting reagent.

Now,

According to Stoichiometry,

In the reaction,

1 mole CH4 produces 2 moles of H2O

Again,

According to Stoichiometry,

In the reaction,

1 mole CH4 produces 1 mole CO2

So, 1 mole of CO2 and 2 mole H2O will be produced in the reaction.

N:B:[Doing calculation with limiting reagent in problems like these gives you the most accurate answer].

The similarity between nuclear energy and fossil fuel is "as both fuels undergo reactions, heat is released, which is used to do work."

Nuclear energy is the type of power produced when a nuclear reaction releases energy. Nuclear energy was exemplified mostly by the electricity generated by just a nuclear reactor, which is Japan's principal source of energy.

Fossil fuel is just a hydrocarbon-containing component that occurs naturally in the earth's crust and is collected and being used as a fuel. The most popular fossil fuels are coal, crude oil, and natural gas.

Therefore, similarity between nuclear energy and fossil fuel is both fuels undergo reactions, heat is released, which is used to do work.

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Answer:

There are 0.0305 calories in 0.128 joules

Explanation:

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

[tex]0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal[/tex]

So, there are 0.0305 calories in 0.128 joules

Answer:

Explanation:

Here, a balance between attraction between nucleus and electrons, and electron-electron, and nuclei-nuclei repulsion play role.

All chemical bonds are formed by overlapping of orbitals. If the electronegativity of the two elements forming the bond is very different (elements from the 1st ,2nd groups with elements of 7th group) then ionic bond are formed. If the electronegativities are more similar, then overlapping is stronger, and covalent bonds are formed.

Answer:

Al2(SO3)3 + 6NaOH → 3Na2SO3 + 2Al(OH)3

Answer:

Each water molecule can form two hydrogen bonds involving their hydrogen atoms plus two further hydrogen bonds utilizing the hydrogen atoms attached to neighboring water molecules.

Explanation:

Answer:

I think it can dissolve 80.0 grams

Answer:

Answer here!

Explanation:

One controlled variable can be that they used the same setup, that is the constant between the two experiments. The manipulation was that Spallanzani used a flask without any air and a flask with air. The responding was or the dependent variable was to notice what had changed so in the experiment Spallanzani noticed that the flask with no air led to no microorganisms meaning that the theory of spontaneous generation is false.

The manipulated variable was the presence or absence of air in the flask. The responding variable was the growth of microorganisms in the broth. The controlled variable was the composition of the broth.

In Spallanzani's experiment, the manipulated variable refers to the factor that the scientist deliberately changes or manipulates. In this case, it was the presence or absence of air in the flasks. One flask had air sealed inside with the broth, while the other flask had no air present.

The responding variable is the factor that is observed or measured in response to the manipulated variable. In this experiment, the growth of microorganisms in the broth was the responding variable. Spallanzani checked for the presence or absence of microorganism growth in each flask.

The controlled variable is the factor that is kept constant or controlled throughout the experiment to ensure that it does not influence the results. In this case, the controlled variable was the composition of the broth used in both flasks. The broth composition was consistent, ensuring that any differences observed in microorganism growth could be attributed to the presence or absence of air.

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Answer:

by repeating the experiment

Explanation:

sometimes repeating the experiment with multiple trials can help make the experiment worth it

Answer:

C.same as [H+]

Explanation:

Autoionization of water is expressed as H+ * OH-  = Kc

The value of Kc is 1*10^-14. Now simply plug thus in and the value of given H+ to solve

(1*10^-7) * OH- = 1*10^-14

OH- = 1*10^-7

Thus, in this scenario, the H+ and OH- ions have same concentration and solution is said to be neutral.

Answer:

Heat transfer by conduction

Explanation:

1kg x 0,37=370gHCL

370g/36,5g/mol=10,137mol/kg

1l=1,185kg

10,137 x 1,185kg/l =12,0mol/l

(x/ml(12mol HCL)*12mol/L)/100ml=0,025mol/L

x=

Answer:

The independent variable is the temperature to which the paint and materials are exposed

The dependent variable is the presence of peeling and cracking of the paint

The constant rates are the paint and material used for each trial

Explanation:

The treatment the to which the paint is subjected = Temperatures from 260 °C  to 650 °C

The method of determining the paint quality = By peeling and cracking

The types of paint and materials used = The same paint and material

The independent variable is the variable suspected as the cause of the effect being studied. It is the variable introduced as a treatment

In the question, given that the paint is subjected to different temperatures from between 260°C to 650 °C, the temperature changes introduced is the independent variable

Therefore;

The independent variable = The temperature to which the paint and materials are exposed to

The dependent variable is the effect variable. It is the variable of the property being investigated and it is also the variable that is measured in the investigation

In the question, given that the after heating the paint and material, the scientist check for peeling and cracking, the dependent variable is the occurrence of cracking and peeling at a given temperature

Therefore;

The dependent variable = The presence of peeling and cracking of the paint

The constant rate(s) are variables which are kept constant during the investigation, under the different treatments

The constant rate(s) in the tests are the paint and material, which were kept the same for each trial to reduce the effect of underlying factors that may impact on the result and obscure the relationship between the dependent and independent variables

Therefore;

The constant rate are the paint and material used for each trial

Answer:

molecular oxygen will effuse faster .

Oxygen will effuse faster than Argon at same temperature .

      R1/R2  = [tex]\sqrt{M2} /\sqrt{M1[/tex]

Molecular / atomic masses of O2 = 32 gm and Ar = 40gm respectively.

                  R1           > R2

Hence , O2 will effuse faster.

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Answer:

∆H= 3.92 kJ

∆S= 2.54 J

Explanation:

Hope It helps

Answer:

1.28 mol

Explanation:

1.28 moles of steam are produced.

Ideal gas equation:-

[tex]PV=nRT[/tex]....(1)

Here, P is the pressure, V is the volume, n is the number of moles, R is the gas constant, T is the temperature.

Given values:-

P=2 atm

T=202.0°C=475.15 K

V=12.50 L

R=0.08231 Latm\Kmol

Substitute all the values in the equation (1) as follows:-

[tex]2\ atm\times12.50\ L=n\times0.0821\ \frac{Latm}{Kmol} \times475.15\ K\\\\\frac{2\ atm\times12.50\ L}{0.0821\ \frac{Latm}{Kmol} \times475.15\ K}=n\\\\0.64\ mol=n[/tex]

The reaction for the combustion of methane is as follows:-

[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]

From the above reaction:-

1 mole of [tex]CH_4[/tex] produces 2 moles of steam

0.64 mole of [tex]CH_4[/tex] produces [tex]0.64\times2=1.28\ moles[/tex]

Hence, 1.28 moles of steam are produced.

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Answer:

Extinct

Explanation:

Extinct volcanos are not expected to erupt, and have not erupted in a very long time.

Answer:

blue react with bases to create a neutral solution

Explanation:

A strong acid will react with a strong base to form a neutral (pH = 7) solution.

V2 = 8.6 L

Explanation:

Given:

T1 = 293K. T2 = 314K

V1 = 8.0 L V2 = ?

Using Charles's law and solving for T2,

V1/T1 = V2/T2

V2 = (T2/T1)V1

= (314K/293K)(8.0 L)

= 8.6 L

Answer:

The answer is D, "sweat requires a lot of thermal energy to be absorbed to evaporate."

Explanation:

Like the other person, I just took the test.

An impact of the specific heat of water on the planet and the life forms in it is: D. sweat requires a lot of thermal energy to be absorbed to evaporate.

Thermal energy is also referred to as heat and it can be defined as a form of energy that is transferred from one physical object to another, especially due to a difference in temperature.

Generally, a lot of thermal energy is required to be absorbed for sweat to evaporate and this is mainly due to the impact of specific heat of water on the planet and all the life forms that are existing on it.

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Answer:

The correct answer is - water exit from the cell.

Explanation:

In this case, the ECF contains a higher concentration of solutes than the cytosol of the cell. This will result in having a lower concentration of water as compared to the ICF.

It is the hypertonic condition where the concentration of solute inside the cell is less than outside of the cell that means the water concentration is higher inside the cell than outside the cell so by the process of osmosis. in osmosis water move from a high concentration area to a low concentration area.