i need help mbrainliest

Explanation:

The answer is D, pitch.

Answer:

B. What is k in the rate law equation?

Rate = k[A]^m[B]^n its rate constant

Answer:

1. a

2.b

Explanation:

Answer:

B) the ability to work

Explanation:

Answer:

The APA rule for numbers is that you should begin a sentence with a word even if the number is greater than nine, and the word "percent" should also be used.

Explanation:

The empirical formula of metal iodide : CoI₃(Cobalt(III) Iodide)

13.02 g sample of Cobalt , then mol Co(MW=58.933 g/mol) :

[tex]\tt mol=\dfrac{mass}{Ar}=\\\\mol=\dfrac{13.02~g}{58.933}\\\\mol=0.221[/tex]

Mass of metal iodide formed : 97.12 g, so mass of Iodine :

[tex]\tt =mass~metal~iodide-mass~Cobalt\\\\=97.12-13.02\\\\=84.1~g[/tex]

Then mol iodine (MW=126.9045 g/mol) :

[tex]\tt \dfrac{84.1}{126.9045}=0.663[/tex]

mol ratio of Cobalt and Iodine in the compound :

[tex]\tt 0.221\div 0.663=1\div 3[/tex]

1.01 x 10^24 molecules.

Explanation:

To calculate the number of molecules in a given number of mole, we can simply multiply by Avogadro's number which is equal to 6.022 x 10 ^23.

Therefore,

10 molecules = 1.68 mol x (6.022 x 10^23 molecules) / (1 mol = 1.01 x 10^24) molecules.

I hope this helps :)

Answer:

The final volume, occupied by the gas at 20° C (293.15 K) and 5.60 atm, is approximately 27.65 L

Explanation:

The given parameters are;

The initial volume, V₁ = 35.0 L

The initial temperature, T₁ = 25 °C = 298.15 K

The initial pressure, P₁ = 4.50 atm

The final volume, V₂ = Required

The final temperature, T₂ = 20 °C = 293.15 K

The final pressure, P₂ = 5.60 atm

From the combined gas equation, we have;

P₁·V₁/T₁ = P₂·V₂/T₂

∴ V₂ = (P₁·V₁/T₁) × T₂/P₂

By substituting the known values, we get;

V₂ = (4.50 × 35.0/298.15) × 293.15/5.60 ≈ 27.65

Therefore, the final volume, occupied by the gas at 20° C (293.15 K) and 5.60 atm, V₂ ≈ 27.65 L

Answer:

Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). They are all transition metals.

Explanation:

The periodic chart has a group (column) of chemical elements called Group 8. Iron (Fe), ruthenium (Ru), osmium (Os), and hastium are the main elements (Hs). All of them are transitional metals.

The Group 8A elements have very little ability to gain or lose electrons to form ions or share electrons with other elements in covalent bonds.

The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are comparable.

The group 8 elements are suitable as cryogenic refrigerants because of their extremely low melting and boiling temperatures.

Therefore, iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs) are elements of group 8.

Learn more about property of group here:

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Answer:

The outer core is the only layer that is liquid. It is also mainly made from nickel and iron. The main job of the outer core is that it's responsible for the Earth's magnetic field. As the earth spins, the liquid inside this layer spins aswell, keeping it balanced.

Answer:

Crust (the surface)

Upper Mantle (dense magma)

Lower Mantle (less dense magma)

Outer Core (pure liquid material)

Inner Core (dense material)

Hope that helps

Answer:

beryllium-10

Explanation:

An isotope is an atom of the same element that has a different number of neutrons.

This means that an isotope of beryllium (Be) would have to be beryllium as well.

The number 10 references the fact that it has four protons and six neutrons:

4 protons + 6 neutrons = 10

While usually the element has 5 neutrons, so it is beryllium-9.

The element that could be an isotope of the atom with four protons, four electrons, and five neutrons is boron-9 and the correct option is option 3.

Isotopes are atoms of the same element that have a different number of neutrons. In this case, the given atom of beryllium has five neutrons, so an isotope of beryllium would have a different number of neutrons.

Among the options provided, boron-9 has a different number of neutrons (four) and is therefore a possible isotope of beryllium. Sodium-10, beryllium-10, and carbon-9 have different numbers of protons and are different elements.

Thus, the ideal selection is option 3.

Learn more about Isotopes, here:

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Answer:

The height = 39.44 m

Explanation:

Given:

Mass m = 2.5 kg

Potential energy = 986 J

Find:

The height

Computation:

Potential energy = mgh

g = Acceleration due to gravity = 10 m/s²

986 = (2.5)(10)(h)

h = 39.44 m

The height = 39.44 m

Answer:

6.28 L

Explanation:

Given data:

Volume of NO₂ = ?

Mass of NO₂ = 12.9 g

Temperature and pressure = ?

Solution:

First of all we will calculate the number of moles of gas.

Number of moles = mass/molar mass

Number of moles = 12.9 g/ 46 g/mol

Number of moles = 0.28 mol

At standard temperature and pressure 1 mole of gas occupy 22.4 L volume.

Thus,

0.28 mol × 22.4 L/1 mol

6.27 L ≅ 6.28 L

Answer:

Mass = 2.355 g

Explanation:

Given data:

Mass of K₂O needed = ?

Mass of KNO₃ produced = 5.00 g

Solution:

Chemical equation:

K₂O + Ca(NO₃)₂     →   CaO +  2KNO₃

Number of moles of KNO₃:

Number of moles = mass/molar mass

Number of moles = 5.00 g/ 101.1 g/mol

Number of moles = 0.05 mol

now we will compare the moles of KNO₃ and K₂O.

               KNO₃           :             K₂O

                  2                :               1

                 0.05           :           1/2×0.05 = 0.025 mol

Mass of potassium oxide needed in gram:

Mass =  number of moles × molar mass

Mass = 0.025 mol × 94.2 g/mol

Mass = 2.355 g

Answer:

Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs). They are all transition metals.

Explanation:

Answer:

Explanation:

Hola! ¿Cómo estás?

Los grupos funcionales se ocupan de la química orgánica y no de la química inorgánica. La química orgánica son los alcanos, alquenos, alquinos y otros. Lo que ha escrito allí como ejemplos no es química orgánica, sino química inorgánica. Eso hace que sea imposible encontrar su grupo funcional, ya que los elementos y compuestos inorgánicos no tienen grupos funcionales.

Yo espero que entiendes

Answer:

pretty sure its D

like 85% sure

Answer: D. Magnetism

Explanation:

Earth's tides are pulled and let go by gravity, basically pulling them higher and then letting go to lower.

Weight is determined by gravity. Ever wondered why austronauts can bounce so easily on the moon? Because the moon has less gravity, and the person is lighter.

Earth's orbit is also determined by gravity, because it is pulled and spun by the sun's gravity.

Answer:

B - Water vapor

Explanation:

Answer:

c,a,d

Explanation:

Answer:

i belive it is

B: Global winds

C: Coriolis Effect

D: Continental deflection

Explanation:

on edge

Answer:

2

Explanation:

Answer:

  802.69 g

Explanation:

The molar mass of Barium nitrite is 229.34 g/mol, so 3.5 moles of it will have a mass of ...

  3.5 mol × 229.34 g/mol = 802.69 g

Answer:

HI

Explanation:

it is a very strong acid made by dissolving hydrogen iodide in water.

Answer:

to turn food into energy

your brain need a lot of oxygen

play an important role in your immune system

Answer:

Yes.............

Explanation:

:)

Answer:

119.13 g C10H15O

Explanation:

First you have to convert the molecules to moles-

2.00×10^23 molecules ( 1 mole/ 6.02×10^23 molecules)

Then convert the moles to grams (you will need a periodic table)

Looking at the periodic table, we see that C=12, H=1, and O=16

so if we add 15 O's, 10 C's and 1 H, we get 361 g.

0.33 moles ( 361 g/1 mole )= 119.13 g

Answer:

volume of box is 38.81 cm³.

Explanation:

Given data:

Width of box = 4.5 cm

Height of box = 5.750 cm

Length of box = 1.50 cm

Solution:

Formula:

Volume = length × height × width

by putting values,

V = 1.50 cm × 5.750 cm× 4.5 cm

V = 38.81 cm³

Thus, the volume of box is 38.81 cm³.