the physical matter of which living or non living things are composed is called a

Methane was unusually high is the correct option. Hence, option B is correct.

Methane is the simplest member of the paraffin series of hydrocarbons and is among the most potent greenhouse gases. Its chemical formula is [tex]CH_4[/tex].

As the ice compacts over some time, tiny bubbles of the atmosphere or surroundings including greenhouse gases like carbon dioxide and methane—press inside the ice. These air pocket “fossils” give samples of what the atmosphere was kind when that layer of ice formed.

Based upon past studies and insights from current GHG levels, we assume that atmospheric levels of carbon dioxide and methane were unusually low.

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Answer:

c

Explanation:

The answer is both i and iii.

Answer:

Solution. Carbonic acid is a dibasic acid with two replaceable hydrogen ions; therefore it forms one acid salt or one normal salt. Hydrochloric acid is a monobasic acid with one replaceable hydrogen ion and so forms only one normal salt.

Explanation:

From the reaction, we can see that the number of moles produced is 2.5 moles of Na2SO4

Chemical reaction involves the combination between two or more species. In this case, the reaction  equation is; 2NaOH + H2S04 ----> Na2SO4 + 2H20.

Now we are told that sulfuric acid is in excess hence NaOH is the limiting reactant.

If 2 moles of NaOH produces 1 mole of Na2SO4

5 moles of NaOH produces 5 moles  * 1 mole/ 2 moles

= 2.5 moles of Na2SO4

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Answer:

1.25 g C3H8

Explanation:

edge lol

From the  highest to lowest Ionization Energies for beryllium, calcium, magnesium, and strontium, the order is:  Be > Mg > Ca > Sr

Ionization energy is defined as a measure of the difficulty in removing an electron from an atom or ion or the tendency of an atom or ion to give off an electron.

Now, ionization energy usually decreases as it descends in a group.  Thus, from the  highest to lowest for beryllium, calcium, magnesium, and strontium, the order is determined as:

Be > Mg > Ca > Sr

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Answer: B (BE > MG > CA > SR)

Explanation: ON EDGE

Answer:

79.7%

Explanation:

Percentage yield = (actual yield/theoretical yield)*100%

Therefore percentage yield for this experiment is: [tex]\frac{192}{241} *100%[/tex]%

[tex]= 0.79668*100[/tex]%

Percentage yield = 79.668%

Rounded to 3 significant figures is 79.7%

Hope this helped!

Answer:

49 moles of atoms

Explanation:

There are 7 individual atoms in each molecule of H2SO4:  (2 hydrogens + 1 sulfur + 4 oxygens).

Therefore, if 7 moles are decomposed, there would be 7 times that amount of individual atoms:

7 x 7 = 49 moles of atoms

The change in the freezing point of the solution is 1.1°C.

The freezing point depression is a colligative property thus we must take note of the number of particles in solution.

Using;

ΔT = k m i

k = 1.86 °C/m

m = 0.195 m

i = 3

ΔT = 1.86 °C/m *  0.195 m * 3

ΔT = 1.1°C

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Answer:

1.0881

Explanation:

Correct answer for Acellus

0.889 ÷ 4187 ÷ 0.124 = 0.00171

Answer:

CsCl

Explanation:

The ionic species are:

           Cs⁺   and Cl⁻

2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag

mol Ag = 7.08 : 108 g/mol = 0.065

the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ

No, all wavelengths/photons of light are emitted from excited electrons.

Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.

When an atom's electrons move to a lower energy state, the atom releases energy in the form of a photon. Depending on the energy involved in the emission process, this photon may or may not occur in the visible range of the electromagnetic spectrum.

Hence, no, all wavelengths/photons of light are emitted from excited electrons.

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Answer:

27966692

Explanation:

I don't know if this is right or not

Explanation:

Answer:

Mendeleev left blank spaces in his version of the periodic table because he left the gaps to place elements not known at the time

Answer:

The air flow carries away the carbon dioxide formed during the decomposition. Once accumulated in the furnace or if the air was not allowed to stream through, it begins to react again with the newly formed calcium oxide, equilibrating rather than completing the reaction.

Answer:

4.5 moles H₂O

       or

81.072 g H₂O

Explanation:

I am not exactly sure whether you want moles H₂O or grams H₂O. So, I'll calculate both. To find the moles H₂O, you'll need to covert moles C₈H₁₈ to moles H₂O via the mole-to-mole ratio from the reaction coefficients. To find the grams H₂O, you need to convert moles H₂O to grams H₂O via the molar mass.

2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O

0.5 mole C₈H₁₈          18 moles H₂O
-----------------------  x  -------------------------  = 4.5 moles H₂O
                                  2 moles C₈H₁₈

Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol

Molar Mass (H₂O): 18.016 g/mol

4.5 moles H₂O         18.016 g
----------------------  x  ----------------  =  81.072 g H₂O
                                  1 mole

Answer:

223 g O₂

Explanation:

To find the mass of oxygen gas needed, you need to (1) convert moles Al to moles O₂ (via the mole-to-mole ratio from reaction coefficients) and then (2) convert moles O₂ to grams O₂ (via the molar mass). When writing your ratios/conversions, the desired unit should be in the numerator in order to allow for the cancellation of the previous unit. The final answer should have 3 sig figs because the given value (9.30 moles) has 3 sig figs.

4 Al + 3 O₂ ----> 2 Al₂O₃
^         ^

Molar Mass (O₂): 32.0 g/mol

9.3 moles Al          3 moles O₂              32.0 g
-------------------  x  ---------------------  x  --------------------  =  223 g O₂
                              4 moles Al               1 mole

Answer: 40. mol (to 2 sf)

Explanation:

Since there are 9 oxygen atoms in every molecule of aluminum nitrate, this means that there are 9 moles of oxygen atoms in each mole of aluminum nitrate.

So, in 4.4 moles, there are 9(4.4) = 40. mol (to 2 sf)

Answer:

halogen

Explanation:

group 17 contains halogens

Answer:

The group 17 falls int he halogen category the element most likely Fluorine Chlorine Bromine Tennessine

Explanation:

Answer:

They are unstable as single atoms, but can become stable by losing or sharing their one valence electron.

Explanation:

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Answer:

one mole contains exactly 6.022 14076 into 10 23 elementary this number is the fix numerical value of the evandi and the constant and a b where expects in the unit mol - 1 is called the abacation number that amount of substance of a system is measured of the number specific

Answer: 29.2

Explanation:

From the coefficients of the equation, we know that for every 3 moles of hydrogen consumed, 1 mole of nitrogen is consumed.

This means we would need 6.25/3 = 2.0833333333333 mol of nitrogen.

Nitrogen has an atomic mass of 14.007 g/mol, so 2.0833333333333 moles of nitrogen have a mass of (14.007)(2.0833333333333) = 29.2 g (to 3 sf)

Answer:

aldehyde

Explanation:

it ends with "al" of "al"dehyde, always check the end

Answer: C

Explanation:

A) There is 1 fewer hydrogen atom.

B) There are 2 fewer carbon atoms.

D) There is 1 extra hydrogen atom.

The changes in different properties such as concentration etc will change if the pH experiences a change.

This is referred to the power of hydrogen and is a measure of the degree of acidity or alkalinity of a substance.

When pH changes, the concentration as well as other properties in this context.

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The magnetic force experienced by a proton moving with a speed of 3 ×[tex]10^{5}[/tex] m/s in the magnetic field B of magnitude 6 ×[tex]10^{-5}[/tex] T will be 2.88×[tex]10^{-18}[/tex] N.

Magnetic force can be defined as the attraction or repulsion force that arises between electrically charged particles due to the motion of the charged particles.

Given,

Speed = 3×[tex]10^{5}[/tex] m/s

Magnetic Field, B= 6 ×[tex]10^{-5}[/tex] T

Magnetic force is the product of velocity, the charge of a proton, and the magnetic field present there.

The magnetic force can be represented as:

F=qvB

F=1.6×[tex]10^{-19}[/tex]×3×[tex]10^{5}[/tex] ×6 ×[tex]10^{-5}[/tex]

F=2.88×[tex]10^{-18}[/tex] N

Hence, the magnetic force experienced by the proton will be 2.88×[tex]10^{-18}[/tex] N.

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(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag