if energy can neither be created nor destroyed, into what kinds of energy have these resources been transformed?

Answer:

is wrong as she fogot  to do something at the start and it is not a fair test

Explanation:

first she need to use the same with in plate second she needs to make the weighs not measure the dish third when the weighs are on 0  put your ingredient on

ps i have dislexia

Answer:

1 mol Ca(OH)2 produces 2 mol NH3

4 mol Ca(OH)2 will produce 8 mol NH3

1 mol NH3 contains 6.022*10^23 molecules NH3

8 mol NH3 contain 8*6.022*10^23 = 4.8*10^24 molecules NH3

Explanation:

% composition of ethanol = 34.51%

% composition of water  = 65.49%

A material's density is defined as its mass per unit volume.

Given data:

The density of ethanol = 0.7890 g/mL

The density of water = 0.9982 g/mL

The density of mixture = 0.926 g/mL

Let the % composition of ethanol = x

Let the % composition of water = 100-x

Now density of the mixture

[tex]\frac{Mass}{Volume}[/tex]

[tex]Mass = \frac{percent \;of \;ethanol \;X \;density \;of \;ethanol \;+ \\ \;percent \;of \;water X \;density \;of \;water}{100}[/tex]

[tex]0.926 = \frac{x X 0.7890 g/mL \;+ (100-x) X 0.9982 g/mL}{100}[/tex]

[tex]x= 34.51[/tex] %

Hence,

% composition of ethanol = 34.51%

% composition of water = 65.49%

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Answer:

Water vapor enters the atmosphere through evaporation from water bodies (oceans, seas, lakes, rivers), ice/snow cover and soil, as well as through evapotranspiration from vegetation

Explanation:

The cycle, which occurs in the troposphere, begins as the sun evaporates large amounts of water from the earth's surface and the moisture is transported to other regions by the wind. As air rises, expands, and cools, water vapor condenses and clouds develop

The mass of the solid is measured using a balance on and a filter paper.

Measurement is very important in the chemistry laboratory. It is often important to measure the mass of a solid which could be used to prepare a solution.

In such cases, a filter paper is placed on the balance and the mass of the paper is measured. The solid is now placed on the paper until the value reads the sum of the masses of the paper and the solid to be measured.

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[tex]K_c = \frac{[NH_2]^{1}[H_2S]^{1}}{[NH_2HS]^{1}}[/tex] is the equilibrium constant expression for

NH₂HS(S)   →   NH₂(g) + H₂S(g). Hence, option A is correct.

A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.

Equilibrium constant for the NH₂HS(S)   →   NH₂(g) + H₂S(g) will be:

[tex]K_c = \frac{[Product]^{coefficient}}{[Reactantt]^{coefficient}}[/tex]

[tex]K_c = \frac{[NH_2]^{1}[H_2S]^{1}}{[NH_2HS]^{1}}[/tex]

Hence, option A is correct.

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At STP 1 mole of gas occupies a volume of 22.4 liters. So 3.3moles of gas at STP7 will theoretically occupy 22.4*3.3-74 liters

Answer:

The new volume is 60ml

Explanation

using the equation p1v1/n1t1=p2v2/n2t2 we would divied 30 by 25 the multiply by 50 to get 60

....................

Answer:

43.2 x 10⁻¹¹

Explanation:

The rate law equation for the reaction is:

Rate = k[CH₃CHO]²

In the table, you are given some of the concentrations and rates. What you are not given is the value of "k". Since you are only given the concentration in Trial 3, you need to know the value of "k" in order to find the rate. To find this value, plug the information from one of the trials into the equation and simplify to find "k".

Rate = k[CH₃CHO]²

2.70 x 10⁻¹¹ = k[2.00 x 10⁻³]²

2.70 x 10⁻¹¹ = k[4.00 x 10⁻³]

6.75 x 10⁻⁶ = k

Now that you know the value of "k", you can use it and the concentration from Trial 3 to find the rate.

Rate =  k[CH₃CHO]²

Rate = (6.75 x 10⁻⁶)[8.00 x 10⁻³]²

Rate = (6.75 x 10⁻⁶)[6.4 x 10⁻⁵]

Rate = 4.32 x 10⁻¹⁰  -------> 43.2 x 10⁻¹¹

Answer:

19-73 70-65-46 78-59-86 84-64

The value of c from the given equation is equal to 58.

Significant figures can be used to create numbers and these numbers can be written in the form of digits. We can determine the number of significant figures by counting the values from the first non-zero figure placed on the left.

In the case of multiplication or division, the number of significant figures must be the same as the value with the minimum significant figures. The significant digits of a given number can be defined as those significant figures, which deliver the meaning relative to its accuracy.

The answer is rounded off in such a manner so it will have the digits after the decimal as the least precise number have the same number of digits after the decimal.

Given the equation can be written as:

a - b - c = 401.0

The value of a = 1387.11

The value of b = 928.321

By substituting the values of 'a' and 'b' in the given equation we can evaluate the value of 'c':

1387.11 -  928.321 - c = 401.0

c = 458.79 - 401.0

c = 57.79

c = 58

Therefore, the value of c is equal to 58.

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Answer:Your can use the internet There is a web site that is called periodic table.com it is very use full

Explanation:Have fun

The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.

Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.

Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.

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The mass, in grams, of hydrogen that would be produced from the reaction will be 0.102 grams

From the balanced equation of the reaction:

[tex]Mg + 2H_2O -- > Mg(OH)_2 + H_2[/tex]

The mole ration of magnesium to water is 1:2.

Mole of 4.73 grams Mg = 4.73/24.3 = 0.195 moles

Mole of 1.83 grams water = 1.83/18 = 0.102 moles

Hence, water is limiting.

Mole ratio of water to the hydrogen produced = 2:1

Equivalent mole of hydrogen gas produced = 0.102/2 = 0.05 moles

Mass of 0.05 moles hydrogen gas = 0.05 x 2 = 0.102 grams

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Answer: A

Explanation: NO CAP..................... A!!!!!!!!!!!!!!

Answer:

Yes it is right........

Answer:

Ba

Explanation:

Atomic radius increases going right to left, and up to down.

So the closest element to the bottom left corner is Ba.

The radioactive waste can be stored for decay and then safely released into the environment is N-16.

Decays can be of three types: alpha, beta and gamma. Each of them corresponds to a different radioactive particle, which changes the nucleus of the emitting atom according to its characteristics.

Nitrogen 16 ( 16 N ) is the unstable isotope of nitrogen whose nucleus consists of 7 protons and 9 neutrons. Its period is 7.13 s.

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Rice, pasta,sugar and chocolate tested positive for starch while water tested negative for reducing sugar.

This is an organic compound which consists of carbon, hydrogen and oxygen.

It consists of sugars, starch etc in which the food mentioned above also contain them which is why they were chosen as the appropriate choice.

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The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.

Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.

The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.

When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

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The respiratory system supplies oxygen to the blood and removes carbon dioxide. The brain monitors respiratory volume and blood gas levels. The brain regulates respiratory rate.

☆...hope this helps...☆

_♡_mashi_♡_

One way the respiratory and nervous systems work together is through the control of breathing rate and depth based on the body's oxygen and carbon dioxide levels.

Chemoreceptor Response to Gas Levels:

Specialized sensors called chemoreceptors are located in the blood vessels, particularly in the aorta and carotid arteries, which detect changes in the levels of oxygen and carbon dioxide in the bloodstream. These chemoreceptors are part of the nervous system and play a crucial role in regulating breathing.

When the oxygen level in the blood decreases or the carbon dioxide level increases (indicating a need for more oxygen or removal of excess carbon dioxide), the chemoreceptors send signals to the brainstem, specifically to the medulla oblongata and pons. These regions of the brain are responsible for controlling involuntary processes like breathing.

The nervous system, upon receiving these signals, responds by adjusting the rate and depth of breathing to ensure that the body's oxygen and carbon dioxide levels remain within a healthy range.

For example, if the oxygen level drops due to increased physical activity, the nervous system stimulates an increase in breathing rate to bring in more oxygen. Similarly, if carbon dioxide levels rise (as during intense exercise), the nervous system triggers deeper and faster breathing to expel excess carbon dioxide.

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Taking into account the scientific notation, the result of the sum is 6.6365×10⁵.

First, remember that scientific notation is a quick way to represent a number using powers of base ten.

The numbers are written as a product:

a×10ⁿ

where:

You want to add two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found.

In this case, the highest exponent is 5.

Then all the values ​​are expressed as a function of the base 10 exponent with the highest exponent. In this case: 8.6500×10³= 0.086500×10⁵

Taking the quantities to the same exponent, all you have to do is add what was previously called the number "a". In this case:

0.086500×10⁵ + 6.5500×10⁵= (0.086500+ 6.5500)×10⁵=  6.6365×10⁵

Finally, the result of the sum is 6.6365×10⁵.

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Answer:

12 banana hands + 2 bottles of chocolate syrup + 12 scoops of Breyers ice cream + 2 containers of candy cherries(30 cherries/per) +  bottle of whipped cream.

Explanation:

Hope this helps!

In Chemistry, a reactivity series of metals , also known as the activity series refers to the arrangement of metals in the descending order based upon their reactivity .

Salient Features :-

The metal reactivity series is given below :-

To access the reactivity of metal , from the given reactivity series identify any of the metal and locate the reactivity based upon the choice of reactivity. The metal at the top (Potassium) is most reactive and the metal at the bottom (Platinum) is the least reactive.

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Qualitative observations are research methods based on your senses measurable often taken using instruments only made by scientists in a laboratory

The research method in which the data is collected either by using the five senses or by measurements, In this the qualities of the substance matter and not the quantity.

The qualitative observation is subjective and so varies from person to person.

Each research using the qualitative observation will be unique.

The data is collected using one to one interaction , by questionnaires , The data is non-numerical.

Qualitative observations are research methods based on your senses measurable often taken using instruments only made by scientists in a laboratory

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After heating the brick and the iron, it is observed that the brick heats up quicker and the brick releases energy quicker.

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.

The iron has more energy than the brick even though it is at the same temperature. That means that the iron must have more particles than the brick.

Iron and brick are both solids and have the same volume, so the difference in total energy must be due to atomic composition.

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Answer:

If the pressure is reduced on the solid carbon dioxide the temperature will drop and the liquid carbon dioxide will solidify into snow-like substance.

Explanation:

The five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, control rods, and a shield/containment system.

Nuclear reactors are the main parts of the nuclear power plant. They run the nuclear power by initiating the nuclear reactions which produce heat.

Thus, the five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, a shield/containment system,  and control rods.

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Answer:

hope it helps

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