CHEMISTRY HIGH SCHOOL

The first pesticides relied on natural chemicals, such as those taken from chrysanthemum flowers.a. True
b. False

Answers

Answer 1
Answer:

Truuuuuuuuueeeee

YoureWelcome

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"A sphere of radius 0.50 m, temperature 27oC, and emissivity 0.85 is located in an environment of temperature 77oC. What is the net flow of energy transferred to the environment in 1 second?"

Answers

Explanation:

It is known that formula for area of a sphere is as follows.

                     A = 4 \pi r^(2)

                        = 4 * 3.14 * (0.50 m)^(2)

                        = 3.14 m^(2)

    T_(a) = (27 + 273.15) K = 300.15 K

          T = (77 + 273.15) K = 350.15 K

Formula to calculate the net charge is as follows.

             Q = esA(T^(4) - T^(4)_(a))

where,    e = emissivity = 0.85

               s = stefan-boltzmann constant = 5.6703 * 10^(-8) Wm^(-2) K^(-4)

                A = surface area

Hence, putting the given values into the above formula as follows.

                 Q = esA(T^(4) - T^(4)_(a))

                     = 0.85 * 5.6703 * 10^(-8) Wm^(-2) K^(-4) * 3.14 * ((350.15)^(4) - (300.15)^(4))

                     = 1046.63 W

Therefore, we can conclude that the net flow of energy transferred to the environment in 1 second is 1046.63 W.

Which quantity can vary among atoms of the same element?A) mass number
B) atomic number
C) number of protons
D) number of electrons

Answers

there is this thing called isotopes
it means that atoms of the same element can have a different number of neutrons.
if there is a change in the no. of neutrons, there will definitely be a change in the mass number.

so the answer is A) mass number

Final answer:

The quantity that can vary among atoms of the same element is the mass number, which represents the sum of the number of protons and neutrons in an atom.

Explanation:

The quantity that can vary among atoms of the same element is the mass number. The mass number represents the sum of the number of protons and neutrons in an atom. While the atomic number (which represents the number of protons) remains constant for atoms of the same element, the number of neutrons can vary, resulting in different mass numbers for atoms of the same element.

Learn more about atom here:

brainly.com/question/30735712

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In an energy diagram, the reactants are at a higher potential energy compared to the products. Which of the following best describes this reaction?A)

It is endothermic and will have a positive enthalpy.

B)

It is endothermic and will have a negative enthalpy

C)

It is exothermic and will have a positive enthalpy.

D)

It is exothermic and will have a negative enthalpy.

Answers

Answer is (D) - It is exothermic and will have a negative enthalpy.


If the reactants are at a higher potential energy compared to the products, it means reactants have more energy than the products. That energy is released to the environment as heat. Due to the releasing of heat to the surrounding, the reaction is exothermic. Since the reaction is exothermic; the enthalpy of the reaction will be negative value.

It's important to match your exercise shoes with the type of exercise in which you will be participating.

Answers

It's important to match your exercise shoes with the type of exercise in which you will be participating. This is to avoid muscle cramps and strains when you are moving. It also provides room for movement for your feet as it will move around a lot.

Answer:

true

Explanation:

Which end of the H-F molecule will be partially positive?neither end
the fluorine end
both ends
the hydrogen end

Answers

Answer:

the hydrogen end

Explanation:

In H - F molecules there is a charge separation. Hydrogen has partial positive charge on them and Fluorine has a partial negative charge on it.

  • The bonds between H - F molecule is a covalent bond.
  • In this bond, both atoms share their electrons to attain a stable configuration
  • But the electrons are not shared equally.
  • Fluorine is more electronegative compared to the hydrogen.
  • Fluorine therefore, attracts the shared electrons more closely to itself.
  • This makes fluorine more negative and hydrogen positive.

What is the shape of a water molecule?a. bent
b. linear
c. pyramidal
d. tetrahedral

Answers

a. bent..................................
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