!Please answer! Sort the chemical reactions based on whether they absorb or release energy


respiration in cells

producing electric current

photosynthesis

burning a candle

baking bread

activating a cold pack

Answer:

Potassium chloride, KCl , is an ionic compound formed by the electrostatic force of attraction that holds the potassium cations and the chlorine anions together. Potassium, K , is located in group 1 of the Periodic Table.

Explanation:

thanks

Answer:

mass number

Explanation:

yeah mass number is the total of protons and neutrons

for example carbon has 12 proton and 12 neutrons therefore it's mass number is 24

i hope this is what you're looking for

Answer:

Section P

Explanation:

Answer:

Well, the mass of the products is equal to the mass of the reactants.

Explanation:

The law of conservation of mass states that,

For any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed.

Taken from here.

Suppose we have the balanced equation of combustion of hydrogen to form water.

The equation will be:

2H2(g)+O2(g)→2H2O(g)

Now, we look at the total mass of the reactants and compare it with the mass of the products.

H2 has a mass of 1⋅2 amu, and so 2H2 will have a mass of 2⋅2=4 amu.

O2 has a mass of 16⋅2=32 amu.

So, the total mass of the reactants (2H2+O2) is equal to 4+32=36 amu.

Now, let's take a look at the mass of the products.

Water has a chemical formula of H2O.

In here, there are two hydrogen atoms and one oxygen atom, and so its mass will be 2+16=18 amu.

There are two water molecules formed, and that means the total mass of the products is 18⋅2=36 amu.

As you can see now, the mass of the products is equal to the total mass of the reactants together, and the chemical equation obeys the law of conservation of mass.

Note that this applies to every balanced chemical equation.

Answer: its D. At point 4, thermal energy from warm air over the land is transferred upward toward cooler areas of the atmosphere

Explanation:

The concentration of the NaOH in the solution will be 0.5 mol/L

The concentration is defined as the amount of a particular chemical present in the mixture.

Now the given chemical reaction is:

2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O

The volume of (H₂SO₄)=0.25 L

The concentration of (H₂SO₄)=2.00 mol/L

The volume of (NaOH)=2.00 L

Now the concentration will be calculated as:

[tex]c(NaOH)= \dfrac{2c(H_2SO_4)}{v(NaOH)}[/tex]

[tex]c(NaOH)=\dfrac{2\times2\times 0.25}{2} =0.5\ \frac{mole}{L}[/tex]

Hence, the concentration of a solution of NaOH is 0.5 mol/L

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Answer:

C. 0.50 M

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

The wavelength of wave is 1.2×10³ m.

Explanation:

Given data:

Frequency of wave = 250,000 Hz

wavelength of wave = ?

Solution:

Formula:

Speed of light = wavelength × frequency

c = λ × f

λ = c/f

speed of light =  3×10⁸ m/s

Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.

λ = 3×10⁸ m/s  / 250,000 Hz

Hz = s⁻¹

λ = 1.2×10³ m

The wavelength of wave is  1.2×10³ m.

Answer: All ionic compounds are electrolytes. When ionic compounds dissolve, they break apart into ions which are then able to conduct a current ( conductivity ).

Explanation:

The pressure will increase if the gas is changed from nitrogen to helium.

The question is incomplete but I will try to help the much I can. We must note that the kinetic energy of the molecules of a gas depends on the temperature and the molar mass of the gas.

Since the average velocity of a gas depends on molar mass also, the pressure will increase if the gas is changed from nitrogen to helium.

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Answer:

0.150g x 1mol/Molar mass of Cu3S = moles

Explanation:

0.150g x 1 mol/222.70= 0.0006735519 moles

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Amphetamine was developed initially as a substitute for a closely-related chemical derived from the Chinese herb ma huang. That chemical is Ephedrine.

Ephedrine is a stimulant medication that can be considered an amine chemical compound and substituted amphetamine.

Ephedrine is used in sports to stimulate the central nervous system (C_NS) and as energy supplier.  

Ep_hedrine use is prohibited and chronic usage of this substance may have problems the health.

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Answer:

A)0.450 mol N2

B)294 g NH4 NO3

Explanation:Step by step! make sure when you see underneath the multipication eqaution that we are deviding!The arrows is what we are dividing

A)36.0gN H4N O3×1 molN H4NO3×2mol N2

        ↑ 1                   ↑ 80.05gNH4NO3 ↑2mol N H4N O3

B)7.35molH2O×2mol N H4 N O3×80.05gN H4 N O3

    ↑    1                 ↑  4molH2O             ↑   1mol N H4N O3

5) 2 and for the how many moles it is 10.9

Hope this helps!

Answer:

B

Explanation:

the size of the individual molecules.

Answer:

Pangaea

Explanation:

The two examples which are possible environmental impacts of flooding include:

Flooding can be defined as a geological process that typically involves the covering of earthen (soil) materials and the transportation of these materials by a natural force such as a large amount of water.

This ultimately implies that, flooding causes and has several environmental impacts on the physical environment due to the submergence of a dry land by a large amount of water, and these include the following:

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Answer:

The two examples which are possible environmental impacts of flooding include:

1. Groundwater recharge.

2. Pollution of water supply.

Explanation:

Answer:

ACTUALLY the correct answer is

helium

Answer:

c.1.5 moles of cu Will contain a total of 9.0 * 10 ^ 23 ATOMS.

To convert moles into atoms they molar amount and number of atom is múltiples by avagadro's number.

Answer:

20.1

Explanation:

li/LiOH×100/1

6/6+16+1×100/1

6/23=20.1%

Answer:

Energy is carried from one point to another or from one region to another by moving mass or through the action of waves.

· All waves have a source.  This source transforms energy into forms that can be carried as waves.

· Waves are not material objects.  Waves represent the moving energy being carried away from the source.

Waves are coordinated vibrations that transport energy.  Sometimes waves require the vibration of particles in matter to move, other waves travel without any need for particle vibrations.

Explanation:

Wave energy requires no motion for its movement whereas matter energy requires motion. Wave energy travels in electromagnetic spectrum whereas this is not applicable to matter energy.

Wave energy is obtained from the water currents in the ocean and seas. The energy so harnessed is a renewable form of energy.

Wave energy is important as it provides enormous energy harvest. Waves have the high potential to generate energy on a mass scale. This energy can be utilized for energy production, water desalination etc. Special wave energy converters are available for this purpose.

Wave energy will reduce the dependence on fossils for energy. It can be considered as a reliable source to obtain energy using wave power. However, it is an expensive way and also requires high maintenance.

Wave energy is also weather dependent. As disturbances in the weather affect the energy production.

Thus, waves can be considered as an important source of renewable energy on earth.

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Answer:

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 = 12.5 g

density = 7.87 g/cm³

We have

[tex]volume = \frac{12.5}{7.87} \\ = 1.588310038...[/tex]

We have the final answer as

Hope this helps you

Answer:

Explanation:

Molar mass CH4 = 16g/molAt STP , 16g CH4 has volume = 22.4LMass of 3.136 L CH4 = 3.136L/22.4L * 16g = 2.24g

According to the standard temperature and pressure conditions and ideal gas equation, the mass of 3.7 L of CH₄ is 0.026 g.

Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.

Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.

Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.These values are important to physicists, chemists ,engineers ,pilots and navigators.

According to ideal gas equation mass= PV×molar mass/RT on substitution mass= 1×3.7×16/8.314×273=0.026 g.

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Answer:

i already commented it but i want points anyways its 80 because 20x4 = 80. it said one gram equals 4 calories and there is 20 grams so basically 4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4

20 grams at 4 calories per gram.

20*4=80 Calories.

in the end, A is your answer

Answer:

91.60 grams

Explanation:

For this specific problem, you are asked to find the weight of an element, when given moles. Other problems could give you a compound. In each case, you need to find the molar mass of the element or compound, that is, the weight (in grams) of 1 mole of the element or compound. Now that you know the molar mass of the element/compound, you can multiply by the amount of moles the equation the equation gives you to find the total weight.

In this problem, you are asked to find the mass of Sodium (Na). First, we need to look on the Periodic Table to find the Atomic Mass of Sodium. If we look, we find this to be 22.990 amu. Side note - when we find molar mass, amu and grams are interchangeable - you'll see here. This 22.990 amu is also the molar mass in GRAMS of 1 mole of sodium. The equation asks us to find the mass of 4 moles of sodium, so now we simply multiply by 4. 22.990 * 4 = 91.60 grams.

In summary, find the molar mass (1 mole) of the substance, by adding the amu's of each element (keeping mind the amount of each). Then, multiply this total number by the amount of moles that is given, and put your answer in moles.

Hope this helps

Answer -

Conductor - material which allow electricity to pass through them

Insulator - material which do not allow electricity to pass through them

Hope it helpz~

Answer:

the possibility of contamination in the laboratory is minimized

Explanation:

When a particular laboratory equipment is used for a given purpose, it can not be used four another purpose until it has been thoroughly washed. This is done in order to avoid contamination when the equipment is subsequently used for a different purpose.

Hence, if a laboratory equipment is not properly cleaned and stored after use, they remain contaminated and give inaccurate results when subsequently used.