please help idk what to do

Answer:

I believe it is an Alkane

Explanation:

Answer: electrical energy

Heat

electric current

Explanation:

In your common lightbulb you will transform electrical energy into two main forms of energy coming off of the lightbulb. Heat: from the filament of the bulb because you are running an electrical current through the filament. The heat is so immense that it forms our second form of energy, which is light!

Hello there!

Question: Which process releases heat?

Explanation: The process the releases heat is called the exothermic process while the process is which heat is absorbed or taken is is called the endothermic process. The answer choices are examples of either endothermic or exothermic processes.

Answer Choices:

A. Grilling Vegetables

B. Frying an egg

C. Boiling water

D. Setting off a firecracker

Correct Answer:

D. Setting off a firecracker

Reasons:

A would not be correct since grilling vegetables is an endothermic process in which heat is being taken in to grill the vegetables.

B would not be correct since frying an egg is again taking in heat to fry the egg which is again, an endothermic process.

C would not be correct since boiling water is taking in heat to heat up the water which makes it endothermic process once again.

D would be correct since it is releasing heat when the explosion is triggered and you can feel the wave of heat afterwards.

P.S: These are all chemical reactions except for boiling water since that is a physical change.

The answer is B: Alkane

The diagram is an example of an alkane which contains n-carbon and 2n+2 hydrogen.

Alkanes are saturated hydrocarbons. This means that their carbon atoms are joined to each other by single bonds.

Alkanes are organic compounds that consist of single-bonded carbon and hydrogen atoms. The formula for alkanes is [tex]C_nH_2_n_+_2[/tex].

Methane ([tex]CH_4[/tex]), ethane ([tex]C_2H_6[/tex]), propane ([tex]C_3H_8[/tex]) and butane ([tex]C_4H_1_0[/tex]) are the first four alkanes.

Hence, the diagram is an example of alkane.

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Answer:

C6H12O6 —> 2C2H5OH + 2CO2

Explanation:

The equation for the reaction is given below:

C6H12O6 —> C2H5OH + CO2

We can balance the equation above as follow:

There are 12 atoms of H on the left side and 6 atoms of the right side. It can be balance by putting 2 in front of C2H5OH as shown below:

C6H12O6 —> 2C2H5OH + CO2

There are 6 atoms of C on the left side and 5 atoms on the right side. It can be balance by putting 2 in front of CO2 as shown below:

C6H12O6 —> 2C2H5OH + 2CO2

Now the equation is balanced.

Answer:

So 1 mole

Explanation:

PV = nRT

P = Pressure atm

V = Volume L

n = Moles

R = 0.08206 L·atm·mol−1·K−1.

T = Temperature K

standard temperature = 273K

standard pressure = 1 atm

22.4 liters of oxygen

Ok so we have

V = 22.4

P = 1 atm

PV = nRT

n = PV/RT

n = 22.4/(0.08206 x 273)

n  = 22.4/22.40

n = 1 mole

Answer:

0.134 moles

Explanation:

In order to solve this, we need to find the molar mass of Chromium, which we can see from the periodic table: it is 51.996 g/mol.

Now, we need to set up an equation to convert grams to moles:

[tex]6.97 grams*\frac{1mol}{51.996grams} =0.134mol[/tex]

Thus, the answer is 0.134 moles of Chromium.

Explanation:

Step 1:  Find how many moles

Formula → [tex]grams*\frac{1 mol}{51.996grams}[/tex]

[tex]6.97 g *\frac{1 mol}{51.996g}[/tex] ← The g's cancel and there is only moles left on top

[tex]0.13405... mol[/tex]

Answer:  Rounded - 0.13405 moles of Chromium

Explanation:

A. Not a chemical reaction. Mold is a small organism.

B. Chemical reaction. When antacid tablet reacts with water CO2 is emitted.

C. Not a chemical reaction ice and water are 2 states of H2O. H2O solid and H2O liquid

D. Not a chemical reaction reactants and the result is the same clay.

Answer:

beta plus

Explanation:

edg

Answer:

beta plus

Explanation:

edge

Answer:

Because if it didn't have structure then your body would fall apart

Explanation:

If you didn't have a spine you couldn't stand up straight

Answer:

A. the ration is 2 to 3, 2Al + 3H2SO4 has the same balance as 18Al + 3H2SO4

2/3 = 18/27

B. Doesn't need an explanation other than the work you did to balance it.

The moles of sulfuric acid reacted with the reaction has been 27 moles. The moles of hydrogen produce is 27 mol, and aluminum sulfate is 9 mol.

The moles of reactant reacted in the reaction, and the moles of product produced, can be given by the stoichiometric law.

According to the stoichiometric law, the moles of product produces, and the reactant reacted is given by the stoichiometric coefficient.

[tex]\rm 2\; mol\;Al=3\;mol\;H_2SO_4\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2SO_4\\\\ 18\;mol\;Al\;=27\;mol\;H_2SO_4[/tex]

Thus, the moles of sulfuric acid reacted in the reaction are 27 moles.

[tex]\rm 2\;mol\;Al=1\;mol\;Al_2(SO_4)_3\\\\18\;mol\;Al=\dfrac{1}{2}\;\times\;18\;mol\;Al_2(SO_4)_3\\\\ 18\;mol\;Al=9\;mol\;Al_2(SO_4)_3[/tex]

The moles of aluminum sulfate produced in the reaction are 9 moles.

The moles of hydrogen produced from 2 moles of Al are 3 moles. the moles of hydrogen produced from 18 mol Al has been:

[tex]\rm 2\; mol\;Al=3\;mol\;H_2\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2\\\\ 18\;mol\;Al\;=27\;mol\;H_2[/tex]

The moles of hydrogen produced in the reaction are 27 moles.

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Answer:

hydrogen

Explanation:

In the reaction between carbon dioxide and hydrogen gas, the species which oxidized is hydrogen. Hydrogen in this reaction oxidizes from 0 to +1 oxidation state.

Oxidation is the reaction with oxygen or loss of an electron in a reaction to form the upper oxidation states. The change in oxidation state depends on the number of electrons lost.

The given reaction is written as follows;

[tex]\rm H_{2} + CO_{2} \rightarrow CO+ H_{2}O[/tex]

In this reaction, one mole of hydrogen gas reacts with one mole of carbon dioxide giving carbon monoxide and water.

In H₂ state, hydrogen is in zero oxidation state. But in water, H is in +1 oxidation state.  In carbon dioxide, carbon is in +4 oxidation state and in CO it has +2. Hence, the oxidized species is hydrogen.

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Answer:

B. Protons

Explanation:

The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element.

Answer:

protons

Explanation:

Answer:

Scale Factor: 1 : 2

X = 11

Explanation:

3 / 3 = 1

6 / 3 = 2

The scale factor should be 1:2

So 'X' should be 11 since 5.5 * 2 = 11

Answer:

Butanoic acid

Explanation:

Answer:

The new volume of the balloon be [tex]462\ cm^3[/tex].

Explanation:

We have,

Initial volume is 556 cm ³

The temperature of the balloon decreases from 278 K to 231 K.

We need to find the new volume of the balloon if the pressure is constant.

The Charles law states that at constant pressure, the volume of gas is directly proportional to its temperature i.e.

[tex]V\propto T[/tex], P is constant

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

[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{556\times 231}{278}\\\\V_2=462\ cm^3[/tex]

So, the new volume of the balloon be [tex]462\ cm^3[/tex].

Answer:

1) 94.0° C, 2) 34.7°C

Explanation:

1)

Q=mcΔt° =mc(t2 - t1)

2350 J = 85.0 g* 0.385 J/(g*°C) *(t2 - 22.2°C)

t2 - 22.2°C = 71.81°C

t2 = 94.0° C

2)

Q=mcΔt° =mc(t2 - t1)

- 2070 J = 75.0 g * 0.903 J/(g*°C) *(t2 -65.3°C)

t2 - 65.3°C =  - 30.56°C

t2 = 34.7°C

Answer:

C.Echinoderms have radial symmetry and worms have bilateral symmetry

Explanation:

Echinoderms evolved from animals with bilateral symmetry. The larvae of all echinoderms are bilaterally symmetrical but lost during metamorphosis  developing into radial symmetry adult. Examples of echinoderms are  starfish, sea urchins, sand dollars.

Worms are invertebrate animals having bilateral symmetry. They have a definite anterior (head) end and a posterior (tail) end. Worms have brains that help them detect objects, food,  mates, and predators quickly.

Answer:

The answer is 0.046 mol.

Explanation:

By looking at the balanced equation, you can form a ratio of lithium chloride and lithium bromide using the coefficient value :

ratio of lithium bromide (2LiBr)

= 2

ratio of lithium chloride (2LiCl)

= 2

So the ratio is 2 : 2 then simplify into 1 : 1 . Which means that 1 mol of lithium bromide is equal to 1 mole of lithium chloride.

In this case, 0.046 mol of lithium bromide will form 0.046 mol of lithium chloride.

The number of moles should be 0.046 mol.

Here we can create a ratio of lithium chloride and lithium bromide by applying the coefficient value :

the ratio of lithium bromide (2LiBr) = 2

And, the ratio of lithium chloride (2LiCl) = 2

Here 2:2 means 1:1

So, the number of moles should be the same i.e. 0.046 mol.

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Answer:

electron in physics , and Element in chemistry.

Answer:b

Explanation:c

Answer:

The correct answer is B . Na2CO3(aq) + CaCl2(aq) → 2NaCl(aq) + CaCO3(s)

Explanation:

hope it works out !!

A double replacement reaction is Na2CO3(aq) + CaCl2(aq) → 2NaCl(aq) + CaCO3(s). Therefore, option B is correct.

When pieces of two ionic compounds are exchanged, two new compounds are created. These reactions are known as double replacement reactions, double displacement reactions, exchange reactions, or metathesis reactions.

We need to understand the types of ionic compounds that create precipitates in order to determine whether double-replacement reactions will take place. In order to do this, we employ solubility principles, which are broad generalizations that foretell which ionic compounds will dissolve (be soluble) and which will not (are not soluble or insoluble).

A double displacement reaction is a particular type of reaction in which two reactants swap ions to produce two new molecules. Water-soluble ionic compounds interact with one another in a number of double displacement processes.

Thus, option B is correct.

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Answer:

[tex]Q=-76.7kJ[/tex]

Explanation:

Hello,

In this case, for such formation of sulfur hexafluoride, the standard enthalpy of formation is -1220.47 kJ/mol (data extracted from NIST database). Next, we compute the moles in 10.0 grams of sulfur hexafluoride as shown below:

[tex]n_{SF_6}=10.0gSF_6*\frac{1molSF_6}{146.06 gSF_6}=0.0685mol[/tex]

Next, for the given energy, we compute the total heat that is liberated:

[tex]Q=-1220.47\frac{kJ}{mol}*0.0685 mol\\\\Q=-76.7kJ[/tex]

Finally, we conclude such symbol has sense since negative heat is related with liberated heat.

Best regards.

Answer:

83.5 kJ

Explanation:

Molar mass is 146.053. Moles of 10.0 g = 0.0685 mol. Multiply by 1220 kJ/mol for the answer of 83.5 kJ.

Answer:

a light year is the distance light travels in one year. 6 trillion miles!!

Explanation:

Answer:

Air pollution is the main cause of rise in temperature over the past century.

Explanation:

Due to increase in the industrialization in different countries of the world and also burning of more fossil fuels in the engines of vehicles and jets are the main reason of increasing global temperature. Both industries and vehicles produce high amount of carbondioxide which is a greenhouse gas that blocks the passage of reflected radiation from the earth surface and traps this radiation which increases the temperature of the earth.

My project is in the file attached, lots of thanks to Maxineishere for helping me with the essay. You may need adobe reader for this as the files are PDF files, I hope you are satisfied! :)

DATE ANSWERED: 5/8/2021

The maximum percentage of carbon monoxide (CO) has been reduced for newer cars as this i) will help mitigate global warming and ii) improve human health.

To identify why the limit of carbon monoxide has to be reduced, we have to understand its effects on our environment and health.

Therefore, to i) reduce global warming and ii) improve human health, the upper limit of carbon monoxide percentage has been reduced for new vehicles.

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Answer:

2nd option

Explanation: