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lora16 [44]
3 years ago
15

The higher the frequency of an electromagnetic wave...

Chemistry
2 answers:
Rainbow [258]3 years ago
8 0
The answer is (D) i believe
not 100% sure
postnew [5]3 years ago
3 0
Your answer should be d
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How many centimeters are in 25 kilometers
slamgirl [31]
There 2.5e+6 centimeters in 25 kilometers.
3 0
3 years ago
Read 2 more answers
What is the angle between the phosphorus-fluorine bonds? (if there is more than one angle, pick the smallest.)
lorasvet [3.4K]

Between equatorial positions, the F-P-F angle is 120°, and between axial and equatorial positions, it is 90°.

<h3>What in chemical bonding is equatorial position?</h3>

Equatorial Organic Chemistry Illustrated Glossary. Equatorial: In cyclohexane, a bond that runs parallel to the ring's axis (i.e., it follows the chair's equator), or a group joined by such a bond. Positions A are axial, and positions E are equatorial.

<h3>Why do equatorial positions have greater stability?</h3>

As was said in the preceding section, the equilibrium favors the more stable conformer because the chair conformation, in which the methyl group is equatorial, lowers steric repulsion. All monosubstituted cyclohexanes share this property.

To know more about equatorial positions visit:

brainly.com/question/24168112

#SPJ4

5 0
2 years ago
Calculate the change in enthalpy for the reaction. (Use 1.0 g/mL as the density of the solution and 4.18 J/(g⋅∘C) as the specifi
Dovator [93]

Here is the full question

Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s)→NH+4(aq)+NO−3(aq) In order to measure the enthalpy change for this reaction, 1.25 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8 ∘C and the final temperature (after the solid dissolves) is 21.9 ∘C. Part A Calculate the change in enthalpy for the reaction in kilojoules per mole. (Use 1.0g/mL as the density of the solution and 4.18J/g⋅∘C as the specific heat capacity.) Express your answer to two significant figures and include the appropriate units. ΔHrxn =   ??? kJ/mol

Answer:

26 kJ / mol

Explanation:

Given that;

The mass of NH₄NO₃ = 1.25 g

Number of moles of NH₄NO₃ = Mass of NH₄NO₃ / Molar Mass of NH₄NO₃

Number of moles of NH₄NO₃= 1.25 g / 80.043 g/mol

Number of moles of NH₄NO₃= 0.016 mol

Volume of solution = 25.0 mL

Density of Solution = 1.0g/mL

Since; density = \frac {mass} {volume}

Mass of Solution = Density x Volume

= 1.0g/mL × 25.0mL

= 25 g

Heat Generated (Q)  = mc \delta T

Q= 25g × 4.18 J/g°C x (25.8°C - 21.9°C)

Q =  407.55 J

Q = 407 × 10 ⁻³ kJ

Q = 0.40755 kJ

Δ H_{rxn} = \frac{Heat generated(Q)}{number of molesof NH_4NO_3}

=  \frac {0.40755 kJ}{ 0.016 mol}

= 25.47 kJ/ mol

~ 26 kJ / mol

Therefore, the change in enthalpy for the reaction in kilojoules per mole = 26 kJ / mol

8 0
3 years ago
Which of the substances below would dissociate into ions when dissolved in water? Select all that apply.
dusya [7]

Answer:

B. NaBr

D. KOH

Explanation:

Below is the solubility rules given for you knowledge.

Salts of

  • Group 1 elements are soluble(Li^+, Na^+, K^+,Cs^+, Rb^+)
  • Ammonium ion is soluble (NH4^+)
  • The nitrate are generally soluble( NO3^-)
  • of Cl- , Br- , and I- are soluble, except Ag+ , Pb+2, and (Hg2)+2
  • most sulfate are soluble, except Ba+2, Ca+2,Pb+2, Ag+, Sr+2.
  • most hydroxide salts are only slightly soluble, except NH+4, Li+, Na+, K+
  • Most carbonates are insoluble (CO3 2-) Except group 1 and NH+4
  • most phosphate are insoluble except group 1 and NH+4  

so using the rules above

NaBr , KOH are soluble, Pb(OH)2 is slightly soluble and AgCl is not soluble.

7 0
3 years ago
When drying fruit you dip the fruit in a syrup solution, you are putting the fruit cells in what type of solution?
tamaranim1 [39]

Answer:

The correct answer is A: Hypertonic solution

Explanation:

Syrup is a solution with a <u>high concentration of sugar</u>. When you put the fruit in this solution, the syrup concentration is higher than the sugar concentration inside the fruit, this is called an <u>hypertonic solution</u>. Consequently, there is a gradient of concentration between the interior of fruit cells and the exterior. The water will go out from the cells towards the exterior, in favor of the concentration gradient. In this way, you are removing water from inside the fruit (drying).

7 0
3 years ago
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