2. In which sentence is the term heat used correctly?
A. Heat moves from a cold cup to warm tea.
B. A thermometer measures the heat in an object.
C. The heat from the hot cup warms my hands.
D. Warm soup contains more heat than cold soup does.

Answer:

D

Explanation:

red

Answer:

Red stars are the coolest along the colors and temperatures of stars.

Explanation:

Hope this helps! <3

Answer:

Explanation:

acceleration no cap

Answer:

Explanation:

The first thing that you need to do here is to calculate the theoretical yield of the reaction, i.e. what you get if the reaction has a

100

%

yield.

The balanced chemical equation

N

2

(

g

)

+

3

H

2

(

g

)

→

2

NH

3

(

g

)

tells you that every

1

mole of nitrogen gas that takes part in the reaction will consume

3

moles of hydrogen gas and produce

1

mole of ammonia.

In your case, you know that

1

mole of nitrogen gas reacts with

1

mole of hydrogen gas. Since you don't have enough hydrogen gas to ensure that all the moles of nitrogen gas can react

what you need

3 moles H (sub 2)

>

what you have

1 mole H (sub2)

you can say that hydrogen gas will act as a limiting reagent, i.e. it will be completely consumed before all the moles of nitrogen gas will get the chance to take part in the reaction.

So, the reaction will consume

1

mole of hydrogen gas and produce

1

mole H

2

⋅

2 moles NH

3

3

moles H

2

=

0.667 moles NH

3

at

100

%

yield. This represents the reaction's theoretical yield.

Now, you know that the reaction produced

0.50

moles of ammonia. This represents the reaction's actual yield.

In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every

100

moles of ammonia that could theoretically be produced.

You know that

0.667

moles will produce

0.50

moles, so you can say that

100

moles NH

3

.

in theory

⋅

0.50 moles NH

3

.

actual

0.667

moles NH

3

.

in theory

=

75 moles NH

3

.

actual

Therefore, you can say that the reaction has a percent yield equal to

% yield = 75%

−−−−−−−−−−−−−

or 75 moles NH sub3

I'll leave the answer rounded to two sig figs.

Answer:a

Explanation:bc

Plates on Earth are moving quickly. Yet, friction causes them to travel more slowly. So, the correct options are B and C.

Tectonic plates are enormous fragments of the upper mantle and crust of the Earth. They are composed of both continental and oceanic crust. Earthquakes occur around mid-ocean ridges and the large faults which mark the edges of the plates.

The Earth's plates are shifting swiftly. Nevertheless, friction slows their movement. Gravity causes the floating plates to rise and fall. On occasion, the movement of tectonic plates results in earthquakes.

When compared to the Earth's mantle, the plates behave like solid, unyielding shells. The lithosphere is the name given to this thick outer layer.

Thus, the correct options are B and C.

Learn more about Tectonic plates, here:

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#SPJ3

Answer:

1.42L of the 9.0M NaOH are required

Explanation:

Molarity is an unit of concentration in chemistry defined as the ratio of the moles of a solute (In this case NaOH) and the volume of the solution.

To solve this question we must know the moles of NaOH required in 4.25L of a 3.0M NaOH as follows:

4.25L * (3.0moles / L) = 12.75 moles of NaOH are required

As all NaOH must come from the 9.0M NaOH the volume we need is:

12.75 moles NaOH * (1L / 9.0 moles NaOH) =

Answer:

HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2

it gives water and Calcium nitrate

Hope to helpfull.

Answer:

HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2

Answer:

Wood consists mainly of organic substances (99% of the total mass). Elemental chemical composition of wood of different breeds is practically the same. Absolutely dry wood on average contains 49% of carbon, 44% of oxygen, 6% of hydrogen, 0.1-0.3% of nitrogen. When burning wood remains its inorganic part - ash.

So the answer is flammability because wood is flammable.

Answer:

H = 226,311.66J

Explanation:

Hello there!

In this case, according to the thermodynamic path ice takes up to steam:

1. Ice (-15°C) --> Ice (0°C) H1

2. Ice (0°C) ---> Water (0°C) H2

3. Water (0°C) --> Water (100°C) H3

4. Water (100°C) --> Steam (100°C) H4

5. Steam (100°C) --> Steam (145°C) H5

It is possible for us to infer that H1, H3 and H5 are computed by means of the mass, specific heat and change in temperature as sensible heat. On the flip side, H2 and H4 are computed as latent heat. Thus, we proceed as follows:

[tex]H1=72.3g*2.093\frac{J}{g\°C}(0+15)\°C=2269.86J\\\\H2=72.3g*334.1\frac{J}{g}=24155.43J\\\\H3=72.3g*4.184 \frac{J}{g\°C}*(100-0)\°C=30250.32J\\\\H4=72.3g*2255.83\frac{J}{g}=163096.51J\\\\H5=72.3g* 2.010 \frac{J}{g\°C}*(145-100)\°C=6539.54J[/tex]

Then, we add them up to obtain the total heat:

[tex]H=H1+H2+H3+H4+H5\\\\H=2269.86J+24155.43J+30250.32J+163096.51J+6539.54J\\\\H=226311.66J[/tex]

Best regards!

The volume (in litres) of 2.75 g of fluorine gas at 35 °C and 4.55 atm is 0.402 L

Mole = mass / molar mass

Mole of F₂ = 2.75 / 38

Mole of F₂ = 0.0724 mole

Using the ideal gas equation, the volume of the gas can be obtained as follow:

PV = nRT

Divide both side by P

V = nRT / P

V = ( 0.0724 × 0.0821 × 308) / 4.55

V = 0.402 L

Learn more about ideal gas equation:

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Answer:

I think that the statement is relative to speed because it is saying km per second.

Answer:

Speed

Explanation:

Answer:

Products

Explanation:

Answer:

carbon is a nonmetal with 4 valence electrons

Explanation:

The element carbon is on the nonmetal section of the periodic table.

Answer:

D. neon.

Explanation:

Hello there!

In this case, according to the following bonding:

[tex]H-F[/tex]

It is possible to bear to mind the fact that hydrogen has one valence electron whereas fluorine has seven. Moreover, once they bond, we understand fluorine takes the only hydrogen's valence electron to attain the electron configuration of the former's contiguous noble gas which is D. neon.

Best regards!

b   it is Explanation:

Answer:

The polar water molecules exert strong cohesive forces on one another

Explanation:

The forces of cohesion refer to the strong attractive forces that molecules of a substance exert on each other.

This strong attractive force keeps the molecules of the water together and causes the water molecules to be pulled inside towards each other. We refer to this phenomenon as surface tension.

Hence, due to surface tension, water does not run off an inclined plane.

Answer:

5 L

Explanation:

Molarity = mol/L   ---->    L = mol/molarity

2.0 moles / 0.4 M HF = 5 L

Answer:

[tex]\boxed {\boxed {\sf B. \ 2 \ diploid \ cells \ and \ 4 \ haploid \ cells}}[/tex]

Explanation:

Mitosis is a type of cell division. It occurs in somatic cells, which are basically any cells other than sex cells. A cell replicates the genetic material then undergoes one division to create 2 identical cells, both with a complete set of chromosomes. These are known as diploid cells.

Meiosis is another type of cell division, but it occurs only in sex cells, called gametes. The cell replicates the genetic material and the chromosomes cross over, which creates completely unique cells. The cell divide to create 2 cells, but then they divide again to create 4 cells. They each have half of the chromosomes of a somatic cell, so they are haploid cells

So, mitosis results in 2 diploid cells and meiosis forms 4 haploid cells.

Answer:

280 liters at STP are in 8.0*10² grams of sulfur dioxide.

Explanation:

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

In this case, the molar mass of sulfur dioxide, that is, the mass of one mole of the substance, is 64 g/mole.

You can apply the following rule of three: if by definition of molar mass 64 grams of sulfur dioxide are contained in 1 mole, 8.0*10² grams are contained in how many moles?

[tex]amount of moles=\frac{8*10^{2}grams*1 mole }{64 grams}[/tex]

amount of moles= 12.5 moles

Now you can apply a new rule of three: if by STP conditions 1 mole of any gas occupies a volume of 22.4 liters, 12.5 moles will occupy how much volume?

[tex]volume=\frac{12.5 moles*22.4 L}{1 mole}[/tex]

volume= 280 L

280 liters at STP are in 8.0*10² grams of sulfur dioxide.

Answer:

Fossils of the plant are abundant right up until the present day. Fossils of the plant appear in recent rock layers but not in older ones.

Explanation:

yay

Answer:

3.75 moles

Explanation:

The chemical equation is 2CH₃OH + 3O₂ -> 2CO₂ + 4H₂O

2 moles of CH₃OH are burned by 3 moles of O₂

For 2.5 moles of CH₃OH are burned by x moles of O₂

Let's solve for x :

2*x=2.5*3 => 2*x=7.5 => x=3.75 moles of O₂ are needed to burn 2.5 moles of CH₃OH

Answer:

There is none

Explanation:

Answer: I've attached my lab report for anyone who needs it. Hope this helps! (I didn't know what to put for some of the answers on the graph, but I've filled it out for the most part)

Answer:

[tex]4118\ g[/tex]

Explanation:

[tex]We\ are\ given,\\No.\ of\ moles\ of\ Na_2SO_4\ provided=29\ moles\\Hence,\\Now,\\Lets\ calculate\ the\ Gram\ Molecular\ Mass\ of\ Na_2SO_4.\\We\ know\ that,\\Gram\ Atomic\ Mass\ of\ Sodium(Na) \approx 23\ g\\Gram\ Atomic\ Mass\ of\ Sulphur(S) \approx 32\ g\\Gram\ Atomic\ Mass\ of\ Oxygen(O) \approx 16\ g\\Hence,\\We\ observe\ that,\\One\ molecule\ of\ Na_2SO_4\ is\ made\ up\ of\ 2\ Sodium\ Atoms,\ 1\\ Sulphur\ Atom\ and\ 4\ Oxygen\ Atoms.[/tex]

[tex]Hence,\\Gram\ Molecular\ Mass\ of\ Na_2SO_4=2*(GAM\ of\ Na)+1*(GAM\ of\ S)\\+4*(GAM\ of\ O)\\=2*23+1*32+4*16\\=46+32+64\\=46+96\\=142\ g[/tex]

[tex]Hence,\\We\ also\ know\ that,\\Mass\ of\ A\ Sample=No.\ of\ moles*Gram\ Molecular\ Mass\\Hence,\\Mass\ of\ 29\ moles\ of\ Na_2SO_4=29*142=4118\ g[/tex]

Answer:

4118.2

Explanation:

Given: 29 moles of na²[tex]So^{4}[/tex]

To find: In grams.

Solution: Wrong

If 1 na²[tex]So^{4}[/tex] is 142 grams, then 29 grams will be found if a set of fraction has been set up;

Let [tex]"x"[/tex] be the variable

[tex]\frac{142}{1} = \frac{29}{x}[/tex]

Cross multiply

[tex]\frac{142}{29}[/tex] [tex]= 4.9[/tex]

Correct Solution

Multiply 29 by 142 = 4118

Answer:

See explanation

Explanation:

As for NH3 and CH4, the former is a polar molecule and possess a dipole. Hence, in addition to dispersion forces, dipole-dipole interaction as well as hydrogen bonding creates a stronger intermolecular interaction than in nonpolar CH4 where only dispersion forces are in operation.

Between NO2 and CO2, the former possesses a dipole moment while the later does not. As a result of that, dipole interaction are in operation in NO2 while only dispersion forces are n operation in CO2.

Between CO2 and CS2, the both molecules are nonpolar but CS2 has a greater molecular mass than CO2. Recall that the greater the molecular mass of a substance the greater its magnitude of intermolecular forces.

Taking into account the intermolecular forces, you get that:

Intermolecular forces or bonds are those interactions that hold molecules together. These are electrostatic forces.

Van der Waals forces are weak attractions that hold electrically neutral molecules together. At some point these molecules present an induced dipole, that is, the molecule acquires a partially positive and a partially negative charge momentarily, causing them to attract each other. They are Van de Waals forces: Dipole - Dipole Forces, London Forces, Ion - Dipole Forces.

The relative order of magnitude of the intermolecular forces is:

Ion-ion forces> Ion-dipole forces> Hydrogen bonds> Dipole-dipole forces> London Dispersion Forces

Taking into account all the above, it can be said that:

Learn more:

Answer:

True

Explanation:

I checked several websites to double check for you.

Answer:

Except for hydrogen and some helium created in the Big Bang, all of the stuff we, and the Earth around us, are made of, was generated in stars, through sustained fusion or in supernova explosions i thank its true :) hope this helps

Answer:

the guy above is wrong

Explanation:

i just did the test and got it wrong

Answer:

Molarity = no of moles of solute/volume of solution in litre

number of moles =given mass/molar mass

moles= 50.6/40 = 1.315 moles

now,

molarity = 1.315/2.5= 0.526M

Answer:

there is the answers. hope this helps

Answer:

When she adds lemon juice

Explanation:

I believe that it is when she adds lemon juice. Lemon juice is an acid, which causes a chemical reaction. It turns from purple to pink because of the acid. Lmk if it's right but I'm 99.9% percent certain it is correct.