A runner can run at a speed of 4km/h in 2 hours. What distance will she
cover in that time? Remember to put the correct units too. *

Answer:

The description and the illustration throughout the question are summarized below.

Explanation:

Answer:

2CuBr +1 F2 ---->  2CuF + 1 Br2

Explanation:

2CuBr +1 F2 ---->  2Cuf + 1 Br2

Check answer

Cu is 2                   Cu is 2

Br is 2                        Br is 2

F is  2                         F is 2

Answer:

lungs and blood vessels, airway

Explanation:

because the respiratory system are a system that helps people breate. the lungs breathe in oxygen and then breathe out carbon dioxide. the blood vessels carries the oxygen into the body to other part of the system in the body that needed oxygen to make glucose.

Answer:

Its southeast

Explanation:

Answer:

southeastt

Explanation:

Answer:

Mostly large grains, with a sticky texture, 55% sand, 40% clay, and 5% silt

Explanation: I took the test, hope it helps.

Mostly large grains, with a sticky texture, 55% sand, 40% clay, 5% silt. The correct option is A.

One side of the triangle represents sand, the other side represents clay, and the third side represents silt.

A soil texture triangle is used to classify a soil's texture class. The percentages of sand, silt, and clay are scaled on the sides of the soil texture triangle.

Clay percentages are read across the triangle from left to right. Silt is read from top to bottom, upper right to bottom.

Jonathan used the soil triangle to identify a sample of soil as sandy clay; the soil description that allowed Jonathan to make this identification is 55% sand, 40% clay, and 5% silt, with mostly large grains and a sticky texture.

Thus, the correct option is A.

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Answer:

Work

Explanation:

Work is defined as the ability to use energy in one second and its SI unit is same as energy that is joule.

Work refers to the energy utilized to displace an object over a distance by an external force in one direction and in given time period which can be one second as well.

Hence, the correct answer is "work".

Answer:

Isotopes of an element have same number of protons but different number of neutrons. Which means isotopes of an element have same atomic number but different mass number.

The chemical property of an element is determined by the number of electrons. And as all the isotopes have same number of electrons, they have same chemical properties.

Thus as isotopes of an element have same atomic number , they have same number of electrons and protons. As they have different mass number, the number of neutrons will be different. Hydrogen has three isotopes , [tex]^1_1\textrm{H}[/tex], [tex]^2_1\textrm{H}[/tex] and [tex]^3_1\textrm{H}[/tex]. Thus [tex]^1_1\textrm{H}[/tex] has no neutron.

Answer:

²⁵₁₁Na⁺

Explanation:

Details about the atom:

          Number of electrons  = 10 electrons

          Number of neutrons  = 14 neutrons

          Number of protons  = 11 protons

The atomic number of an atom is a good indicator of the type of atom we have been given.

From the subatomic particles, the number of protons is the same as the atomic number.

 Since the number of protons is 11, its atomic number will be 11.

The element with atomic number 11 is sodium, Na.

  To write a complete notation, we also need the mass number;

  Mass number  = number of protons + number of neutrons

  Mass number  = 11 + 14  = 25

 The charge on the atom:

     Charge  = Number of protons  - number of electrons  = 11  - 10  = 1+

The element in isotopic notation is given as;

                  ²⁵₁₁Na⁺

Answer:

Corrosion

Explanation:

Silver, although known as a nobble metal, is also subject to corrosion process such as having silver tarnish when exposed to sulfur and air.

Tarnishing occurs on the surfaces of some metals such as brass, copper, and silver, which results in a corroded layer. Silver tarnish occurs from the chemical reaction that takes place when silver is exposed to sulfur which results in the formation of black Ag₂S

In order to restore the original silver surface, the silver tarnish (silver sulfide) layer is removed.

We have the statement presented here as follows;

The forks shown are made of silver (Ag). Some of the silver forks shown have lost their luster - they have become tarnished. This is an example of Corrosion.

Answer:

The system's potential energy is increased by gaining altitude. Then, gravity takes over, causing most of the potential energy to be converted into kinetic energy

Explanation:

Answer:

See the answer below

Explanation:

What really happened was that the component molecule present in the teabag became hydrated as a result of dissolution in water. Once dissolved, the molecules start to move about from the region of higher concentration - that is, the tea bag - to the region of lower concentration until the molecules become uniformly diffused throughout the water in the mug.

Answer:

Answer:

C. Organ

Explanation:

definition- "In biology, an organ  is a collection of tissues that structurally form a functional unit specialized to perform a particular function.

Answer:

sorry im not sure

Explanation:

a

Answer:

ions with opposite charge

Explanation:

ionic bond is formed between oppositely charged ions in a chemical compound.

Answer: ions with opposite charges

Explanation:

The state of matter with the slowest moving atoms is solid. The correct answer is option C.

State of matter refers to the physical form that matter can exist in, such as solid, liquid, gas, and plasma.

In a solid, the particles are closely packed together and have a fixed position in a crystal lattice structure. The intermolecular forces between the particles are strong, which causes them to vibrate in place.

Therefore, the slowest moving atoms are found in the solid state of matter. Option C is the correct answer.

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Answer:

Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg

Explanation:

Specific heat capacity of paraffin, Cp = 2.90 J/g.°C = 2900 J/kg.°C

Specific heat capacity of water = 4.20 J/g.°C = 4200 J/kg.°C

Amount of heat energy that can be stored by 4.73 * 10³ kg of water heated through a degree rise in temperature can be calculated as below:

Using  H = mCpθ where m is mass of substance, Cp is specific heat capacity and θ is temperature change

H = 4.73 * 10³ kg * 4200 J/kg.°C * 1°C

H = 19866000 J

Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10 3 kg of water for a degree rise in temperature is calculated as follows:

H = mCpθ

19866000J = m * 2900 J/kg.°C * 1°C

m = 19866000J / 2900 J/kg

m = 6850.34 kg = 6.85 * 10³ kg

Therefore, mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg

Answer:

Mass = 18.9 g

Explanation:

Given data:

Mass of Al₂O₃ formed = ?

Mass of Al = 10.0 g

Solution:

Chemical equation:

4Al + 3O₂      →       2Al₂O₃

Number of moles of Al:

Number of moles = mass/molar mass

Number of moles = 10.0 g/ 27 g/mol

Number of moles = 0.37 mol

Now we will compare the moles of Al and Al₂O₃.

                      Al          :          Al₂O₃

                       4           :            2

                     0.37        :         2/4×0.37 = 0.185 mol

Mass of Al₂O₃:

Mass = number of moles × molar mass

Mass = 0.185 mol × 101.9 g/mol

Mass = 18.9 g

The second volume : 42.2 L

Given

51.7 L at 27 C and 90.9 KPa

Required

The second volume

Solution

STP = P₂=1 atm, T₂=273 K

T₁ = 27 + 273 = 300 K

P₁ = 90.9 kPa = 0,897 atm

Use combine gas law :

P₁V₁/T₁ = P₂V₂/T₂

Input the value :

0.897 x 51.7/300 = 1 x V₂/273

V₂= 42.20 L

Answer:

We heart you don't have all the information you just got some common substances and their chemical formulas are listed in the chart? That we don't have the chart to see which of the substances are elements

Explanation:

sorry about that if you can take a picture of it and repost it I am sure I could answer it for you

Answer:

 2Sb   +    3I₂    →    2SbI₃

Explanation:

The reaction expression we need to balance is:

         Sb   +    I₂    →    SbI₃

To balance this expression, we need to assign the variables a,b and c to each specie as the coefficient that will balance the expression.

              aSb   +    bI₂    →    cSbI₃

Conserving Sb :  a  = c

                      I :   2b  = 3c

let a  = 1, c  = 1,  b  = [tex]\frac{3}{2}[/tex]  

   Multiply through by 2;

 a  = 2, b  = 3  and c  = 2

         2Sb   +    3I₂    →    2SbI₃

Answer:

2

Explanation:

Answer:

A lack of rain or the location is experiencing a dry season

Explanation:

Answer:

Explanation:

How many atoms are in a 3.5 g sample of sodium (Na)? In this example, multiply the grams of Na by the conversion factor 1 mol Na/ 22.98 g Na, with 22.98g being the molar mass of one mole of Na, which then allows cancelation of grams, leaving moles of Na.

Answer:

ONE MOLE of any element has 6.023x1023 atoms of that element. Therefore 1 mole or 22.99 grams of Na = 6.023x1023 atoms of Na.

Explanation:

Answer:

P₂ = 0.11 atm

Explanation:

Given data:

Initial pressure = 0.12 atm

Initial temperature = 294 K

Final pressure = ?

Final temperature = 273 K

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

0.12 atm / 294 K = P₂/273 K

P₂ = 0.12 atm × 273 K / 294 K

P₂ = 32.76 atm. K /294 K

P₂ = 0.11 atm

Answer:

D

Explanation:

because the answer is D

The characteristics of the shielding we can find the correct answer for the shielding of a magnesium electron is:

          c) The 1s, 2s, and 2p electrons

The quantum mechanic shielding is the effect that the electrons closest to the atomic nucleus have to create a potential barrier for the electrons of the higher orbits.

The net attractive force on the electron of Magnesium is diminished by the effect of the electrons in the lower shells n = 1 and n = 2

As the level n = 2 is closer to the level n = 3 this is the one that creates the greatest shielding, but the innermost level also contributes a part.

The other electron at the same energy level n = 3, has an effect due to the Pauli exclusion principle, it forces it to have an opposite spin, to be able to be together, creating an exchange energy between the two electrons, but it does not shield the core charge as they are together.

Let's examine the different claims

a) False. Electrons at level n = 1 also create shielding

b) False. Electrons at levels n = 1 and n=2 create a shield, but the other electron is at the same level n = 3 and does not shield the nucleus.

c) True. The internal levels serves as a screen for the electron each with a different magnitude

d) False. The 2p orbital creates a large shield since it has 6 electrons

In conclusion, using the characteristics of the shielding we can find the correct answer for the shielding of a magnesium electron is:

        c) The 1s, 2s, and 2p electrons

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The final temperature, t₂ = 30.9 °C

Given

24.0 kJ of heat = 24,000 J

Mass of calorimeter = 1.3 kg = 1300 g

Cs = 3.41 J/g°C

t₁= 25.5 °C

Required

The final temperature, t₂

Solution

Q = m.Cs.Δt

Q out (combustion of compound) = Q in (calorimeter)

24,000 = 1300 x 3.41 x (t₂-25.5)

t₂ = 30.9 °C

Answer:

a) 30.9

Explanation:

edge 2021

Answer:

synthesis d

Explanation:

did that at my school

Answer:

C.

reduce the amount of fossil fuels they combust

Explanation:

study island