how do cultures form?

Answer:−329.4 calorie

Explanation:Heat released by metal = q=m_mc_m(T_2-T1)q=m

m

​

c

m

​

(T

2

​

−T1)

m_m=50\ g\\c_m=0.108\ cal\ g^{-1}\ \degree C^{-1}\\q=50\times0.108(17-78)=-329.4\ caloriem

m

​

=50 g

c

m

​

=0.108 cal g

−1

 °C

−1

q=50×0.108(17−78)=−329.4 calorie

Here minus sign indicate that heat is released

It occurs in oxygen I think

Answer:

The correct  option is E

Explanation:

Generally the a base with the highest [tex]K_b[/tex] is the strongest base and from the data given

       [tex]C_2H_5NH_2[/tex] has the highest value of [tex]K_b[/tex] so [tex]C_2H_5NH_2[/tex]  is the strongest base while  [tex](NH_2)_2CO[/tex] has the lowest value of [tex]K_b[/tex] so [tex](NH_2)_2CO[/tex]  is the weakest base

  Generally the conjugate acid of a weak base is always a strong acid

So

  For  [tex](NH_2)_2CO[/tex] which the weakest base it conjugate acid which is [tex][NH_2NH_3CO]^+[/tex] will be the strongest acid

Answer:

CaBr2 and CaCl2 solubility increases with increase in pH while the solubility of Ca(OH)2 and MgCl2 increases with decrease in pH.

Explanation:

Yes, solubility of compounds change with ph. The solubility of CaBr2 increases with the increase occurs in pH. The solubility of CaCl2 also increases with the increase in pH of a solution. On the other hand, the higher pH, decreases the solubility of Ca(OH)2 while with low pH, Ca(OH)2 solubility increases. MgCl2 solubility also increases with the decrease occurs in pH. There are different solubilities for different compounds , some compounds having highest solubility in acidic and some in basic.

When the CaBr2 and CaCl2 solubility rises with an increase in pH while the solubility of Ca(OH)2 and also MgCl2 increases with a reduction in pH.

Yes, When the solubility of combinations changes with ph. When The solubility of CaBr2 expansions with the increase occurs in pH. Then, The solubility of CaCl2 also increases with the accumulation in pH of a solution. On the different indicators, the higher pH decreases the solubility of Ca(OH)2 while with low pH, Ca(OH)2 solubility increases. MgCl2 solubility also increases with the decrease transpiring in pH. So, There are different solubilities for different compounds, When some compounds have the highest solubility in acidic and also some in basic.

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Answer:

beryllium

Explanation:

Answer:

a. True

Explanation:

Yes, the titration curve can determine or can reveal the pKa value of a weak acid.

Titration is a scientific method to estimate the dissolved substance concentration, known as the titrand, in a known volume when it reacts with another chemical substance of known volume as well as concentration. The other substance is known as Titrant.

When a weak acid like acetic acid is titrated to a very strong base such as NaOH, the titration curve is obtained and the pH value is noted. But the titration curve of any weak acid shows a characteristic shape. At the end of titration, the acetic acid will convert into acetate ions.

pKa is the negative logarithm of the Ka of the acid. pKa is the pH of the acid  where the concentration of the weak acid as well as the conjugate base is in equimolar concentration.  

Answer:

Yes

Explanation:

Some scientific facts are still under investigation of why it is true or not;i.e, science made us to believe that human evolution first started in the Sahara of East Africa which we don't know if it's true or not, but that's what the scientists said. And as of present days the new generations of scientists are still trying to testify if the facts are true, so it might change once their researches proved another facts differ from what we were taught.

Answer:

Energy in the United States comes mostly from fossil fuels: in 2010, data showed that 25% of the nation's energy originates from petroleum, 22% from coal, and 22% from natural gas.

Explanation:

It is really self explanitory

Answer:

pH = 1.05

Explanation:

A solution of sulfuric acid, H₂SO₄, dissociates in water as follows:

H₂SO₄ → 2H⁺ + SO₄²⁻

That means per mole of H₂SO₄ you will have 2 moles of H⁺

pH = -log [H⁺]

As [H₂SO₄] = 0.045M and [H⁺] = 2×[H₂SO₄]

[H⁺] = 0.090M

pH = -log [0.090M]

Answer:

[tex]m_{SO_2}=0.175gSO_2[/tex]

Explanation:

Hello,

In this case, since the first step is to write the properly balanced chemical reaction:

[tex]P_4S_3 (s) + 8O_2 (g)\rightarrow P_4O_{10}(s) + 3SO_2 (g)[/tex]

We can see that given the 0.200 g of P4S3 (molar mass 220 g/mol) the mole ratio between it and SO2 (molar mass 64 g/mol) is 1:3, therefore, the produced mass of SO2 turns out:

[tex]m_{SO_2}=0.200gP_4S_3*\frac{1molP_4S_3}{220gP_4S_3} *\frac{3molSO_2}{1molP_4S_3} *\frac{64gSO_2}{1molSO_2} \\\\m_{SO_2}=0.175gSO_2[/tex]

Best regards.

Answer:

SO4 (aq) + Sr (aq) >> SrSO4 (s)

Explanation:

K+1 SO4-2 + Sr +2 I2- >> sK +1

(you dont separate and write down the ions for Sr SO4 because its a solid)

Cancel out the same ions from both sides and write down what your left with.

Answer:

For the following reaction, 8.00 grams of silicon tetrafluoride are allowed to react with 7.40 grams of water. silicon tetrafluoride (s) + water (l) hydrofluoric acid (aq) + silicon dioxide (s) What is the maximum amount of hydrofluoric acid that can be formed? grams What is the FORMULA for the limiting reagent? H2O What amount of the excess reagent remains after the reaction is complete? grams

Answer:

A- producers provide energy to all of the other organisms. they directly supply energy to primary consumers (animals who eat plants). They indirectly supply energy to other consumers by feeding the animals that they eat. The energy gets transferred from the producers to the primary consumers, to the secondary consumers, and to the tertiary consumers.

B- aphids and slugs both eat producers. if the aphid population decreases, there will be less competition for the slugs to eat the their food.

Answer:

[MA4B2]2+

Explanation:

Octahedral species are species that has a coordination number of of six. This means that six ligands are attached to the central metal atom/ion.

For any octahedral specie to exhibit geometrical or cis-trans isomerism, it must have the formula EX2Y4 as in [MA4B2]2+, hence the answer above.

Answer:

152.4 g

Explanation:

Step 1: Given data

Number of H atoms: 8.334 × 10²⁴ atoms

Step 2: Calculate the moles of H corresponding to 8.334 × 10²⁴ atoms of H

We will use Avogadro's number, that is, there are 6.022 × 10²³ atoms of H in 1 mole of H.

8.334 × 10²⁴ atom × (1 mol/6.022 × 10²³ atom) = 13.84 mol

Step 3: Calculate the moles of ammonium acetate (NH₄CH₃CO₂) that contain 13.84 moles of H

The molar ratio of NH₄CH₃CO₂ to H is 1:7. The moles of NH₄CH₃CO₂ that contain 13.84 moles of H are 1/7 × 13.84 mol = 1.977 mol.

Step 4: Calculate the mass corresponding to 1.977 moles of NH₄CH₃CO₂

The molar mass of NH₄CH₃CO₂ is 77.08 g/mol.

1.977 mol × 77.08 g/mol = 152.4 g

Answer:

Sublimation is when a solid transitions into a gas, without turning into liquid.

Decantation is when a mixture of liquids is allowed to separate, such that an element of the mixture may be removed.

Answer:

C

Explanation:

The element gold has a consistent melting point and color regardless of the physical changes. This identifies gold as a pure substance. The correct option is C.

Pure substances are those that are made up of only one type of atom, and nothing is mixed in these substances. They are only one type of particle. They have fixed mass and structure.

Gold is an element that has an atomic number of 79. It is a bright yellow colored and shiny metal. It is used to make an ornament, which is made by mixing other metal to it.

Elements and compounds are subclasses of pure substances. A material that solely contains one type or class of atom is said to be an element. Gold is a pure substance, it is made by one type of atom which is Aurum (Au).

Thus, the correct potion is C. A pure substance.

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Answer:

Heating water with an open flame

Explanation:

Remember, we are told in the label that Acetone is a "flammable liquid and vapor." Being flammable means the substance can easily be set on fire, and we would expect an open flame from heating water to trigger an explosion (a disaster) in which the Acetone is set on fire causing life-threatening dangers to the second group of students.

Given :

Some compounds :

[tex]A)\ CH_3Cl\ B)\ CH_3I\ C)\ CH_3Br\ D)\ CH_4[/tex] .

To Find :

Which of the following compounds has the most deshielded protons .

Solution :

Deshielded means nucleus whose chemical shift has been increased due to removal of electron density, magnetic induction, or other effects .

In simple words deshielding means the ability to shift protons .

Now , among Cl , I , Br and H . Cl is the most electron negative .

Therefore , deshielding will be more in [tex]CH_3Cl[/tex] .

Hence , this is the required solution .

The compound with the presence of most deshielded protons has been [tex]\rm \bold{CH_3Cl}[/tex]. Thus, option A is correct.

Diesheilded protons have been explained as the shift in the protons of the central atom with the bonding to a more electronegative element.

The electronegative element has been possessing the negative charge and is attracted to the positive charge.There has been a shift in the protons in the sample that has been resulted in the de-shielded protons.

In the given compounds, the anions bonded to the methyl groups are Cl, C, Br, and H. Among the following, the most electronegative atom has been chlorine.

Thus, the molecule of [tex]\rm \bold{CH_3Cl}[/tex] has been consisted of the most de-shielded protons. Thus, option A is correct.

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Answer:

The specific heat of molybdenum is 0.254 joules per gram-Celsius.

Explanation:

We consider the system formed by the molybdenum metal and water as our system, a control mass inside an insulated cup, that is, a container that avoids any energy and mass interactions between system and surroundings.

From statement we notice that metal is cooled down whereas water is heated. According to the First Law of Thermodynamics, we know that:

[tex]Q_{metal} - Q_{water} = 0[/tex]

[tex]Q_{metal} = Q_{water}[/tex]

Where:

[tex]Q_{water}[/tex] - Heat received by water, measured in joules.

[tex]Q_{metal}[/tex] - Heat released by metal, measured in joules.

Now we expand this identity by definition of sensible heat:

[tex]m_{metal}\cdot c_{metal}\cdot (T_{m,o}-T) = m_{water}\cdot c_{water}\cdot (T-T_{w,o})[/tex]

The specific heat of the metal is cleared within equation above:

[tex]c_{metal} = \frac{m_{water}\cdot c_{water}\cdot (T-T_{w,o})}{m_{metal}\cdot (T_{m,o}-T)}[/tex]

If we know that [tex]m_{water} = 0.237\,kg[/tex], [tex]m_{metal} = 0.244\,kg[/tex], [tex]c_{water} = 4186\,\frac{J}{kg\cdot ^{\circ}C}[/tex], [tex]T_{w,o} = 10\,^{\circ}C[/tex], [tex]T_{m,o} = 100.10\,^{\circ}C[/tex] and [tex]T = 15.30\,^{\circ}C[/tex], the specific heat of molybdenum is:

[tex]c_{metal} = \frac{(0.237\,kg)\cdot \left(4186\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (15.30\,^{\circ}C-10\,^{\circ}C)}{(0.244\,kg)\cdot (100.10\,^{\circ}C-15.30\,^{\circ}C)}[/tex]

[tex]c_{metal} = 254.119\,\frac{J}{kg\cdot ^{\circ}C}[/tex]

The specific heat of molybdenum is 0.254 joules per gram-Celsius.

Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} [/tex]

From the question

mass = 7.9 g

density = 2.28 g/mL

The volume is

[tex]volume = \frac{7.9}{2.28} \\ = 3.46491228[/tex]

We have the final answer as

Hope this helps you

Answer:

A

Explanation:

Earth's garvitational energy is directly proportinal to the mass and hight of a body. Thus mass and height have the same effect on gravitational potential energy.

Gravitational potential energy is the energy stored in a massive body relative to its position in gravitational field.

The gravitational potential energy of a massive body can be determined relative to the position of another body affected by gravity. As per the equation for gravitational potential energy i.e., Mgh, both height and mass of a body has equal influence on its gravity.

If and object falls from a large height it experience higher gravity. Similarly more massive body is largely affected by gravity.

Therefore, both mass and height have the same effect on gravitational potential energy

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Answer:

true

Explanation:

Answer:

True

Explanation:

Observation is objective while inference is subjective.

Answer:

a way in which something is usually done, especially within a particular area or activity.

Explanation:

Explanation:

1. K (Potassium)

2. Te (Tellurium)

3. F (Flourine)

4. group 11, period 4

5. group 18, period 4

6. group 12, period 6

7. Cl

8. Pb

9. W

10. Sb

11. Na

12. period 6, group 11

13. period 5, group 11

14. period 2, group 16

15. Groups 13–16 of the periodic table contain one or more metalloids

16. Hydrogen

17. Helium

18. Calcium

19. Cobalt

20. Carbon

1. K (Potassium)metal is found in the group 1 and period 4.

2. Te (Tellurium) metalloid is found in the group 16 and period 5.

3. F (Flourine)nonmetal is found in the group 17 and period 2.

4. Group 11, period 4 group will you find copper.

5. Group 18, period 4 group will you find krypton.

6. Group 12, period 6 group will you find mercury.

7. Cl is the symbol for chlorine.

8. Pb the symbol for lead.

9. W the symbol for tungsten.

10. Sb is the symbol for antimony.

11. Na is the symbol for sodium.

12. Period 6, group 11 period will you find gold.

13. Period 5, group 11 period will you find silver.

14. Period 2, group 16  of the periodic table contain one or more metalloids.

15. Groups 13–16 groups will you find metalloids.

16. Hydrogen element has the symbol H.

17. Helium element has the symbol He.

18. Calcium element has the symbol Ca.

19. Cobalt element has the symbol Co.

20. Carbon element has the symbol C.

In chemistry mixture is a combination of two or more different chemical elements which are not chemically bond. A mixture is the physical combination of two or more elements in which their individual identities are retained and it also mixed by solutions, suspension and colloids.

In chemistry compound is combination of two or more different elements which are chemically bond. So compound is held by chemical bond. A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.

Therefore, 1. K (Potassium)metal is found in the group 1 and period 4.

2. Te (Tellurium) metalloid is found in the group 16 and period 5.

3. F (Flourine)nonmetal is found in the group 17 and period 2.

4. Group 11, period 4 group will you find copper.

5. Group 18, period 4 group will you find krypton.

6. Group 12, period 6 group will you find mercury.

7. Cl is the symbol for chlorine.

8. Pb the symbol for lead.

9. W the symbol for tungsten.

10. Sb is the symbol for antimony.

11. Na is the symbol for sodium.

12. Period 6, group 11 period will you find gold.

13. Period 5, group 11 period will you find silver.

14. Period 2, group 16  of the periodic table contain one or more metalloids.

15. Groups 13–16 groups will you find metalloids.

16. Hydrogen element has the symbol H.

17. Helium element has the symbol He.

18. Calcium element has the symbol Ca.

19. Cobalt element has the symbol Co.

20. Carbon element has the symbol C.

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Answer:

need image

Explanation:

The images most likely associated with this question are honey, salt, and oxygen. Honey is a liquid, salt is a solid, and oxygen is a gas.

(The pictures below are associated with this question.)

Answer:

a

[tex]a_o  = 4.95 *10^{-8} \  cm  [/tex]

b

[tex]r =  1.7500 *  10^{-8} \  cm[/tex]

Explanation:

From the question we are told that

   The  density of  lead is  [tex]\rho_l =  11.36 \  g/cm^3[/tex]

   The atomic weight is  [tex]M_w  =  207.19 \  g/mol[/tex]

    The  Avogadro's number is  [tex]N_a  =  6.022 *  10^{23} \  \frac{atom}{mol}[/tex]

Generally for FCC the number of  atom is  n  =  4

 Generally the volume of a unit FCC cell is mathematically represented

          [tex]V =  \frac{n  *  M_w }{N_a  *  \rho_l }[/tex]

          [tex]V =  \frac{4  *  207.19 }{ 6.022 *  10^{23}  *  11.36 }[/tex]

         [tex]V = 1.211 5 *10^{-22} \  cm^3[/tex]

Generally the lattice parameter is mathematically represented as

      [tex]a_o  = \sqrt[3]{V } [/tex]

     [tex]a_o  = \sqrt[3]{1.211 5 *10^{-22} } [/tex]

=>   [tex]a_o  = 4.95 *10^{-8} \  cm  [/tex]

Generally the radius of the lead is mathematically represented as

        [tex]r =  \frac{a_o  *  \sqrt{2}  }{4}[/tex]

=>      [tex]r =  \frac{4.95 *10^{-8}  *  \sqrt{2}  }{4}[/tex]

=>      [tex]r =  1.7500 *  10^{-8} \  cm[/tex]