This is for science! I really need help.

Answer:

ExpC

H

4

+  

2

O

2

→

C

O

2

+  

2

H

2

O

This is the balanced reaction equation for the combustion of methane.

Explanation:

The Law of Conservation of Mass basically states that matter can neither be created nor destroyed. As such, we must be able to show this in our chemical reaction equations.

If you look at the equation above, you'll see an arrow that separates the reaction equation into two parts. This represents the direction of the reaction.

To the left of the arrow, we have our reactants.

To the right of the arrow, we have our products.

The quantity of each individual element in the left must equal the quantity of each individual element in the right.

So if you look below, you'll see the unbalanced equation, and I'll try to explain how to balance the reaction.

C

H

4

+  

O

2

→

C

O

2

+  

H

2

O

Our reactants in this equation are  

C

H

4

and  

O

2

.

Our next step is to break these down into individual atoms.

We have:

1 C atom, 4 H atoms & 2 O atoms.

If you're confused by this, look to see the little number to the bottom right of each element, the subscript, and it tells you how many of each atom are in the molecule. Make sense?

Now we look to the other side of the equation.

Here we see our products are  

C

O

2

+  

H

2

O

Again, we break these down into individual atoms again.

We have:

1 C atom, 2 H atom, 3 O atom

Answer:

A TRUEEEEEEEE

Explanation:

Answer:

I think you would have to multiply 6 times 2, which it equals 12. And then just divide it by 300, and that's your answer. Hope I was able to help!

Explanation: Have a good day!

Answer:

neon is the Noble gas but I have not studied this much

Answer:

0.02

Explanation:

Molecular mass of water= 2×1+1×16=18g

=2×1+1×16=18g

For 90g178.2g water nₐ  =5

Molecular mass of glucose  6×12+12×1+6×16=180g

For 18g glucose nb =0.1

Now,  X  B  =  0.1 / 0.1 + 5=0.0196 ~0.02

Answer: It takes more energy to increase the temperature of water than to increase the temperature of oil.

Explanation:

yes

Answer: CH3COO)2Mg + H2SO4 = MgSO4 + CH3COOH

Explanation:

Hope. This helps

Answer:

Gold

hope this helps :)

Answer: Gold

Explanation: Gold is called a heavy metal because of its high density, which comes from the fact that each of its atoms is individually very heavy. ... In contrast, gold atoms slide past each other relatively easily, which makes the metal soft and malleable.

Answer:  6100 seconds

Explanation:                                                                                                            6.1 Kiloseconds = 6100 Seconds

Converting 6.1 Kilo seconds is 6100 seconds.

The unit of time measurement used by the International System of Units (SI) is the second (s or sec). Any specific period of time that is used to measure or represent duration on a regular basis is referred to as a unit of time.

The second is the fundamental unit of time in the International System of Units and by extension. There are different units of time. They are hour, second, and minute. 1 minute is equal to 60 seconds. 60 minutes into one hour, and 24 hours equals one day.

The unit can be converted into different units as 1 ks equals 1000 seconds. To convert a unit first determine the unit, then match the unit which others, and then know the units.

Thus, the 6.1 Kilo seconds is 6100 seconds.

To learn more about seconds, refer to the link:

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Answer:

8.02 g of HCl could be left over by the chemical reaction

Explanation:

We propose the reaction:

HCl(aq) + NaOH (s) → NaCl (aq) + H₂O (l)

Ratio is 1:1. First of all, we determine the moles of reactants:

14 g . 1mol / 36.45g = 0.384 mol of acid

6.55 g. 1mol / 40g = 0.164 mol of base

If a determined mass of HCl, could be left; this means that the acid is the excess reagent.

For 0.164 moles of NaOH, we need 0.164 moles of HCl.

As we have 0.384 moles, (0.384 - 0.164) = 0.220 moles of acid are left over in the reaction. We convert the moles to mass:

0.220 mol . 36.45 g /1mol = 8.02 g

Answer:

The ratio of f at the higher temperature to f at the lower temperature is 5.356

Explanation:

Given;

activation energy, Ea = 185 kJ/mol = 185,000 J/mol

final temperature, T₂ = 525 K

initial temperature, T₁ = 505 k

Apply Arrhenius equation;

[tex]Log(\frac{f_2}{f_1} ) = \frac{E_a}{2.303 \times R} [\frac{1}{T_1} -\frac{1}{T_2} ][/tex]

Where;

[tex]\frac{f_2}{f_1}[/tex]  is the ratio of f at the higher temperature to f at the lower temperature

R is gas constant = 8.314 J/mole.K

[tex]Log(\frac{f_2}{f_1} ) = \frac{E_a}{2.303 \times R} [\frac{1}{T_1} -\frac{1}{T_2} ]\\\\Log(\frac{f_2}{f_1} ) = \frac{185,000}{2.303 \times 8.314} [\frac{1}{505} -\frac{1}{525} ]\\\\Log(\frac{f_2}{f_1} ) = 0.7289\\\\\frac{f_2}{f_1} = 10^{0.7289}\\\\\frac{f_2}{f_1} = 5.356[/tex]

Therefore, the ratio of f at the higher temperature to f at the lower temperature is 5.356

"The characteristics of electro-magnetic travel in straight lines and have the ability to bounce off objects. Traveling at the speed of light can bend around moving objects due to the interplay of an electric and magnetic field."

What is electromagnetic wave?

Electromagnetic waves, or EM waves, are formed when an electric field as well as a magnetic field vibrate together. EM waves, in other terms, are magnetic and electric fields that oscillate.

What is Electromagnetic radiation?

Electromagnetic radiation is made up of electromagnetic field waves that travel over space and convey electromagnetic radiant energy. Radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays are all examples. The electromagnetic spectrum includes all of these wavelengths.

To know more about electromagnetic wave click here.

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Answer:

SEE EXPLANATION

Explanation:

We have the mole ratio as; 94 : 4.0 : 1.5 : 0.50

This implies that the total number of natural gas is; 94 + 4.0 + 1.5 + 0.50 = 100 moles

Recall that partial pressure = mole fraction * total pressure

For CH4 = 94/100 * 1.48 atm = 1.39 atm

For C2H6 = 4/100 * 1.48 atm = 0.0592 atm

For C3H8 = 1.5/100 * 1.48 atm = 0.0222 atm

For C4H10 = 0.5/100 * 1.48 atm = 0.0074 atm

Answer:

Diamond - E

Sugar- C

Milk - M

Iron- E

Air- M

Sulfuric Acid- C

Gasoline - M

Electricity- X

Krypton- E

Bismuth - E

Uranium - E

Kool-Aid -M

Water - C

Alcohol - C

Pail of Garbage - M

Ammonia - C

Salt - C

Energy - X

Gold - E

Wood - M

Bronze - M

Ink - M

Pizza - M

Dry Ice - C

Baking Soda - C

Explanation:

An element is the smallest part of a substance that is capable of independent existence. An element cannot be broken down into any other substance. Krypton, Bismuth etc are all elements.

A compound is a combination of two or more elements which are chemically combined together e.g NH3, CO2 etc.

A mixture is any combination of substances that are not chemically combined together. E.g Pizza, milk etc

Answer:

65.8mL of water and 184.2mL of the 95% EtOH stock solution must be added.

Explanation:

To solve this question we need to find hoy many times the 95% EtOH must be diluted to obtain a 70% EtOH solution. That is:

95% / 70% = 1.357 times the solution must be diluted.

If we want to make 250mL of the diluted solution, the amount of 95% that must be added is:

250mL / 1.357 times =

184.2mL of the 95% solution must be added

And of water:

250mL - 184.2mL = 65.8mL of water

Answer:

T2+500k - 273 = 223 *C

Explanation:

Answer:

332.918g O2

Explanation:

I'm having some issues with the work however, your final answer should be 332.918g O2

Hope this helped!

Answer:

should be B

because the player has more mass than the puck

Explanation:

Answer:

I dont know, sorry!

Answer:

Yea pretty much it's 3.49

Explanation:

Answer: [tex]Ca(OH)_2(s)+2HCl(aq)\rightarrow CaCl_2(aq)+2H_2O(l)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The balanced chemical equation is:

[tex]Ca(OH)_2(s)+2HCl(aq)\rightarrow CaCl_2(aq)+2H_2O(l)[/tex]

Answer:

Boiling

Explanation:

Answer:

2 3 3 2

Explanation:

Answer:

True

Explanation:

magnesium and copper react with dilute acids to make salts and hydrogen gas

Answer:

The resulting mass will be higher than expected

Explanation:

We have to keep this in mind; When magnesium is being burnt in air, two reactions are taking place. The first one is;

2Mg(s) + O2(g) ------> MgO(s)   -------1

And

3Mg(s) + N2(g) -------> Mg3N2(s)  ---------2

Now, if the steps that should be taken to convert Mg3N2 to MgO are not taken, the reaction is much quicker but a higher mass of solid is obtained than what was expected.

This higher mass of solid obtained owes to the fact that Mg3N2 from reaction 2 was not converted to MgO leading to contamination of the product.