Where do living organisms obtain energy for cell processes?
A. When bonds form during cell processes, energy is absorbed.
B. When bonds form during cell processes, energy is released.
C. When bonds in food are broken, energy is released.

Answer:

In conclusion, acetone was determined to be the unknown used in the simple distillation and acetone- water was separated successfully by fractional distillation. Introduction Distillation is the chief technique used to separate and purify liquids.

Answer:

1.07 g Ba

Explanation:

Hello there!

In this case, according to the definition of the Avogadro's number and the molar mass, it is possible to say that 6.022x10^{23} atoms of barium equal one mole, and at the same time, 1 mole equals 137.327 grams of this element; thus, it is possible to say that 6.022x10^{23} atoms of barium have a mass of 137.327 grams; therefore, it i possible for us to calculate the required mass in grams as shown below:

[tex]4.69x10^{21}atoms*\frac{137.327gBa}{6.022x10^{23} atoms} \\\\=1.07gBa[/tex]

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Explanation:

potassium oxide is K2O

calcium oxide is CaO

calcium oxide is used to make glass

potassium oxide is used in fertilizer

Answer:

The correct answer should be 12.72 pH of the mixed solution and 9.94g mass of solid BASO4 formed.

The molecules of Ba(OH)2 are : 1.00M x 0.05L = 0.05 ( moles )

The molecules of H2SO4 are : 0.494M x 0.0864L = 0.0426816

Ba(OH)2 + H2SO4 ----> BaSO4 + 2 H2O

0.0426816<--- 0.0426816

The mixed solution is Ba(OH)2 with 0.05 - 0.0426816 = 0.0073184

The concentration of mixed solution is : 0.0073184 : ( 0.05 + 0.0864 ) = 0.054 M

The pH of mixed solution is 14 - -log[0.054] = 14 - 1.27 = 12.73 PH

And the mass of BaSO4 is 0.0426816 x ( 137 + 32 + 16 x 4 ) = 9.94 gams.

Nitrogen reacts with Hydrogen to form Ammonia gas by Haber's Process.

N₂ + 3H₂ → 2NH₃

This law states that Mass can neither be created, nor destroyed and it can just be transformed from one form to another. This law has application as balancing of the reaction.

Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.

Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.

Some examples of balanced chemical reaction are-

2Mg(s) + O₂(g) ⟶ 2MgO(g)

According to the given picture,

Correct option is C. It consists 1 molecule of Nitrogen gas, 3 moles of Hydrogen gas and 2 moles of Ammonia gas.

Therefore, Nitrogen reacts with Hydrogen to form Ammonia gas by Haber's Process.

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Locations of high air pressure is the beach whereas the location of low air pressure is in the sea on a hot, sunny, summer afternoon.

Areas where the air is warmed have lower pressure because the warm air rises in the air. These areas are known as low pressure systems. Places where the air pressure is high, are called high pressure systems. These are places where air is cold.

So we can conclude that Locations of high air pressure is the beach whereas the location of low air pressure is in the sea on a hot, sunny, summer afternoon.

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Hi there!

Here's a screenshot of the problem being solved.

Answer:

3.2

Explanation:

The missing graph is attached in the image below:

Initially, p.H from the graph is approximately 2.1

Therefore; the hydrogen ion concentration is

[tex][H^+] = 10^{-2.1}[/tex]

[tex][H^+] = ({k_a \times 0.10})^{\dfrac{1}{2}}[/tex]

[tex]{k_a} = 6.3 \times 10^{ -4}[/tex]

pKa = [tex]-log ( 6.3 \times 10^{-4})[/tex]

pKa = 3.2

a. an unsaturated organic functional group that absorbs ultraviolet or visible radiation.

Hope this helps :D

Answer:

i thinks its a. but iam not sure

Answer:

66.0 mL HClO3

Explanation:

M1V1 = M2V2

M1 = 0.100 M HClO3

V1 = ?

M2 = 0.165 M KOH

V2 = 40.0 mL KOH

Solve for V1 --> V1 = M2V2/M1

V1 = (0.165 M)(40.0 mL) / (0.100 M) = 66.0 mL HClO3

Answer:

NaBH4

H3O+

Explanation:

The conversion of 3-pentanone to form 3-pentanol is a reduction reaction. The first step of the reaction is the transfer of a hydride ion to the carbonyl from the reducing agent sodium borohydride.

After the transfer of the hydride ion, transfer of a proton from H3O+ completes the reaction mechanism hence 3-pentanol is formed from 3-pentanone.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.86 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.86}{6.02} \\ = 0.641196...[/tex]

We have the final answer as

Hope this helps you

Answer:

breathed in air contains oxygen while breathed out air contains higher percentage of CO2

The net ionic equation for the reaction between Na₂SO₄ and CaCl₂ is:

SO₄²¯(aq) + Ca²⁺(aq) —> CaSO₄(s)

(Option C)

In solution, Na₂SO₄ and CaCl₂ will dissociate as follow

Na₂SO₄(aq) —> 2Na⁺(aq) + SO₄²¯(aq)

CaCl₂(aq) —> Ca²⁺(aq) + 2Cl¯(aq)

Na₂SO₄(aq) + CaCl₂(aq) —>

2Na⁺(aq) + SO₄²¯(aq) + Ca²⁺(aq) + 2Cl¯(aq) —> CaSO₄(s) + 2Na⁺(aq) + 2Cl¯(aq)

Cancel out the spectator ions (i.e Na⁺ + Cl¯) to obtain the net ionic equation

SO₄²¯(aq) + Ca²⁺(aq) —> CaSO₄(s)

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Answer:

V=12.6148888506L

Explanation:

using charles law Volume1/Temperature1 = Volume2/Temperature2

13.4L/(17C+273.15C)=V/273.15K

remember gas equations require kelvin not celcius so converting celcius to kelvin is Celcius + 273.15 which is standard temperature conditions

Answer:

No, they are not able to bond.

Explanation:

Hello there!

In this case, regarding chemical bonds, it is necessary to remember that these come up when a metal is bonded with a nonmetal, or, when two nonmetals get bonded; however, even there exist a type of denominated metallic, it is not eligible for boron and lithium because they tend to stable as cations (positive) and therefore, equal charges are not eligible for bonding, thus, boron and lithium would not be able to bond.

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Answer:

2.28

Explanation:

HCl(l) ===> H+ + cl-

HCl is a very strong acid. Almost all of it will decompose to the right. That means the concentration of H+ is 0.00530

pH = - log [H+]

pH = - log[0.00530]

pH = - - 2.2757

pH = 2.2757

Rounded this 2.28

Answer:

1 - D) friction

2- B) rough

3- B) gravity

4- A)smooth

5- C)gravity pulls you down

Answer:

1 M C6H1206s

1 M NaNO3

1 M Ca(NO3)2

1 M Li3PO4

Explanation:

Hope it helps!

The order of solutions from lowest freezing point to highest freezing point of the given compounds are Li₃PO₄ < Ca(NO₃)₂ < NaNO₃ < C₆H₁₂O₆.

Depression in freezing point will be calculated from the following reaction as:

ΔTf = i × Kf × m, where

ΔTf = change in freezing point

i = Vant Hoff factor

Kf = freezing constant

m = concentration in terms of molality

In the question concentration of compounds are given in molarity and for all compounds it is same, so the depression in freezing point will directly depends on the Vant Hoff factors of given compounds.

From the above data it is clear that Li₃PO₄ will have the lowest freezing point and C₆H₁₂O₆ will have the highest and sequence from lowest to highest will be shown as:
Li₃PO₄ < Ca(NO₃)₂ < NaNO₃ < C₆H₁₂O₆.

Hence the required order is Li₃PO₄ < Ca(NO₃)₂ < NaNO₃ < C₆H₁₂O₆.

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Answer:

5.42

Explanation:

I used a calculator

Answer: 5.42 mol CO2

Explanation: Uses idea gas law

Answer:

It will go to your hand.

Explanation: If you touch a hot cup/mug you'll most likely burn yourself, so it would probably go to your hand.

Answer:

Thus, the speed at B = 13 m/s

Explanation:

From the attached image:

Using the conservation of energy;

Iinital M.E = Final M.E

where;

M.E = mechanical energy

∴

[tex]\dfrac{1}{2} \times m \times v_A^2+ mgh_A = \dfrac{1}{2} \times m \times v_B^2+ mgh_B[/tex]

[tex]\dfrac{1}{2} \times m \times 3^2+m \times 9.8 \times 15 = \dfrac{1}{2} \times m \times v_B^2+ m\times 9.8 \times 7 \\ \\ \dfrac{1}{2} \times 3^2 + 9.8 \times 15 = \dfrac{1}{2} \times v^2 + 9.8 \times 7 \\ \\ \implies 151.5 = 0.5 v^2 + 68.6 \\ \\ 0.5v^2 = 151.5 - 68.6 \\ \\ 0.5 v^2 = 82.9 \\ \\ v^2 = \dfrac{82.9}{0.5} \\ \\ v^2 = 165.8 \\ \\ v = \sqrt{165.8} \\ \\ v = 12.9 \ m/s\\ \\ \mathbf{v \simeq 13 \ m/s}[/tex]

Answer:

C

Explanation:

nucleoid is prokaryotic

Answer:

mitochondria is found in eukaryotic cells.