Matter is a substance that has ________.

1,6,4 coefficients ensure that there are equal numbers of atoms of each element on both sides of the equation. So correct option is A.

A chemical equation is a symbolic representation of a chemical reaction, which shows the reactants, products, and their relative amounts. It is a shorthand way of describing a chemical reaction using chemical symbols and formulas.

A chemical equation consists of two sides, the reactant side and the product side, separated by an arrow, which represents the direction of the reaction. The reactant side lists the starting materials or reactants, while the product side lists the substances that are formed as a result of the reaction.

The balanced chemical equation for the reaction is:

P4O10 + 6 H2O → 4 H3PO4

The correct set of coefficients to balance the equation is:

A.  1,6,4

These coefficients ensure that there are equal numbers of atoms of each element on both sides of the equation.

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Thin layer chromatography (TLC) is a separation technique commonly used in chemistry to separate and identify different components of a mixture.

In this technique, a stationary phase, which is usually a thin layer of silica gel or alumina coated on a flat plate, is used to separate the mixture. The mobile phase, on the other hand, is the solvent that is allowed to move through the stationary phase carrying the components of the mixture along with it.

In the specific TLC experiment you mentioned, the mobile phase used will depend on the nature of the mixture being separated. Typically, the mobile phase is a solvent or a mixture of solvents that can dissolve the components of the mixture, but not the stationary phase. The mobile phase should be chosen carefully to ensure that the components of the mixture are separated effectively.

As for the stationary phase, it is usually made up of a thin layer of silica gel or alumina coated on a flat plate. This stationary phase provides a large surface area for the mixture to interact with, allowing the components to separate based on their physical and chemical properties.

In summary, thin layer chromatography is a specific type of separation technique that uses a stationary phase and a mobile phase to separate and identify components of a mixture. The mobile phase used in the experiment depends on the nature of the mixture being separated, while the stationary phase is typically a thin layer of silica gel or alumina coated on a flat plate.

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Answer:

1. I hypothesize that if you continue to add more drops, then the time it takes will continue to increase.

2. A; 9.70 secs, B; 14.63 secs, C; 18.78 secs, D; 28.70 secs, E; 31.45 secs.

3. The formation continued to increased. As more was added, the time it took to reach the full reaction was increased.  

4. Yes.  

5. When the concentration of all the reactants increases, more molecules or ions interact to form new compounds, and the rate of reaction increases. When the concentration of a reactant decreases, there are fewer of that molecule or ion present, and the rate of reaction decreases.

6. 6mL.

Explanation:

Psychochemical may persist for hours or days after exposure.

Chemical substances that have brief, reversible effects on the body or mind are known as psychochemical agents, often known as incapacitating substances. Psychochemical agents have a longer-lasting effect than riot-control chemicals, which only have a few-minute duration. Central nervous system (CNS) stimulants and depressants both fall within the category of psychochemical substances.

Drugs that depress the central nervous system (CNS) prevent the CNS from functioning and prevent information from traveling across neuron synapses. 3-Quinuchdedinyl Benzilate is an illustration of this group of chemicals, and it has an impact on memory, problem-solving, focus, and instruction-listening abilities. Instead of affecting one's ability to think, cannabinoids and phenothiazines cause sleepiness and a lack of motivation. Although 10,000 times more strong than morphine, fenyls are opiates that have a similar effect.

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The new pressure of the gas : 0.75 atm

Boyle's Law  

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

\(\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}\)

P₁=1 atm ⇒ standart temperature and pressure (STP)

V₁=3 L

V₂=4 L

\(\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_2=\dfrac{1\times 3}{4}\\\\P_2=0.75~atm\)

Answer:

All these conversion factors are equal to 1. If it doesn't seem obvious at first, think about it for a second. Realize that 1 minute is equivalent to 60 seconds. Simply replace 1 minute in the fraction with its equivalent 60 seconds and it becomes clear that 60 seconds / 60 seconds = 1. Numerator and denominator are equivalent; they are just expressed differently.

Explanation:

The initial unit cancels out and goes into the new unit

In science, we often need to convert from one unit to another to ensure accuracy of our calculations.

Let's say i want to convert 500 minutes to seconds.

The conversion factor is as follows;

60 seconds make 1 minute

x seconds make 500 minutes

x = 60 seconds * 500 minutes/1 minute

x = 30,000 seconds

Hence the initial unit which is "minutes" is canceled  out and the new unit "seconds" remains.

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When H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases (option C)

A French scientist (Chatelier) postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states that If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

According to Chatelier's principle a decrease in concentration of the products will favor the forward (right) reaction.

From the above principle, we can conclude that when H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases.

Thus, the correct answer to the question is option C

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Answer:

The climate was very hot and became colder in later time periods.

Answer:

The climate was very hot in earlier time periods and became colder in later time periods.

The correct answer for the thermochemical equation for the standard molar enthalpy of formation of solid zinc nitrate is option b) Zn(s) + 2N(g) + 6O(g) → Zn(NO3)2(s).

This equation represents the formation of one mole of solid zinc nitrate from its constituent elements in their standard states, with all reactants and products in their standard states and under standard conditions (25°C and 1 atm pressure).
To determine the standard molar enthalpy of formation of a compound, we need to measure the enthalpy change that occurs when one mole of the compound is formed from its elements in their standard states. In this case, we need to measure the enthalpy change for the reaction Zn(s) + 2N(g) + 6O(g) → Zn(NO3)2(s), which corresponds to the formation of one mole of solid zinc nitrate from its elements in their standard states.
This reaction can be measured experimentally using calorimetry, which involves measuring the heat released or absorbed during the reaction. The enthalpy change for this reaction is then divided by the number of moles of zinc nitrate formed to obtain the standard molar enthalpy of formation of solid zinc nitrate.

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Answer:

B

Explanation:

Answer:

1.48×10²⁴ Cu atoms

Explanation:

For this question you need to use Avogadro's number 6.022×10²³atoms.

2.45 moles of Cu ×\(\frac{6.022x10x^{23} atoms }{1 mole}\)= 1.47539×10²⁴ atoms.

The moles cancel out so you are left with atoms.

Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.

The empirical formula for the hydrocarbon after complete combustion is C2H5.

1 mole of carbon dioxide contains a mass of 44 g, out of which 12 g are carbon.

Hence, in this case the mass of carbon in 26.0 g of CO2:

(12/44) × 26.0 = 7.0909 g

1 mole of water contains 18 g, out of which 2 g is hydrogen;

Therefore, 2.6 g of water contains;

(2/18) × 12.4 = 1.3777 g of hydrogen.

Now, to calculate the empirical formula,

We first calculate the number of moles of each,

Carbon = 7.0909/12  = 0.5909 moles

Hydrogen = 1.3777/1 = 1.3777 moles

Now, calculate the ratio of Carbon to hydrogen by dividing with the smallest number value;

            Carbon : Hydrogen

 0.5909/0.5909 : 1.3777/0.5909

                      1 :  2.5

                     (1 : 2.5) 2

                    = 2 : 5

Hence, the empirical formula of the hydrocarbon is C2H5.

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Answer:

Br

Explanation:

looking at all options:

Al = Al3+ + 3e-

K=K+ + e-

Cu = Cu2+ + 2e-

Br + 2e- = Br2-

Cr = Cr3+ + 3e-

answer is Br.

Nuclear fission occurs when a nucleus breaks up into two equal fragments that release and separate more atoms. So, the correct option is B.

Nuclear fission is a process in which the nucleus of an atom breaks apart into two or more smaller nuclei. This process releases a significant amount of energy.

This energy is utilized in various applications, including nuclear power generation and nuclear weapons. Nuclear fission reactions are carefully controlled in nuclear power plants to ensure the sustained release of energy without leading to uncontrolled chain reactions. Hence the correct option is B.

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Neon gas has 2 times the root mean square speed to that of Krypton at same temperature.

The formula for calculation of root mean square speed is as follows -

v = ✓(3RT/M). In the formula, v is speed, R is gas constant, T is temperature and M is molar mass. Based on the information, we can interpret that all the values will be same except speed and molar mass. So, keeping the value of molar mass of Neon and Krypton to find the speed.

Let gas 1 be Neon and gas 2 be Krypton.

\( v_{1}\)/\( v_{2}\) = ✓\( M_{2}\)/\( M_{1}\)

Molar mass of Neon = 20 g/mol

Molar mass of Krypton = 84 g/mol

\( v_{1}\)/\( v_{2}\) = ✓84/20

\( v_{1}\)/\( v_{2}\) = ✓4.2

\( v_{1}\)/\( v_{2}\) = 2

\( v_{1}\) = 2\( v_{2}\)

Thus, root mean square speed of Neon is 2 times of root mean square speed of Krypton.

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Answer: With this tool, the

✔ copper

could be

separated from the

✔ aqueous solution

.

Explanation:

EDU 2021

Answer:

The answer should be krypton Im doing the test rn.

Explanation:

The most reactive element in period 4 which is shiny and forms a +1 cation is potassium.

The periodic table is defined as an arrangement of elements in groups and periods. The elements in the same group have similar properties while the elements in the same period has the same number of shells.

The element in period 4 that is shiny, forms a cation of +1 charge and is the most reactive in period 4 is the element potassium.

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The difference in the means is 2.2.

given that :

original scores are = 75, 85, 90, 90, 100, 75, 80, 100, 90.

Grades after retake the exam = 85, 85, 100, 90, 100, 85,80, 100, 90.

now,

The sum of original score=  75 + 85 + 90 + 90 + 100 + 75 + 80 + 100 + 90

                                            = 785

mean = 785 / 9 = 87.2

sum of score after retake=  85 + 85 + 100 + 90 + 100 + 85 + 80 + 100 + 90

                                          =  805

mean = 805 / 9 = 89.4

the difference in mean is = 89.4 - 87.2

                                          = 2.2

Thus, The difference in the means is 2.2.

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B) Chlorine typically takes around 10 minutes to kill almost all microorganisms, excluding endospores. Its strong oxidizing properties disrupt the cellular structures and metabolic processes of microorganisms, leading to their inactivation or death.

Almost all microorganisms, excluding endospores, are killed by chlorine in approximately 10 minutes. Chlorine is commonly used as a disinfectant due to its ability to effectively kill a wide range of microorganisms, including bacteria, viruses, and fungi.

The disinfection process involves exposing the microorganisms to chlorine, which acts as a strong oxidizing agent. Chlorine disrupts the cellular structures and metabolic processes of microorganisms, leading to their inactivation or death.

While the exact time required for chlorine to kill microorganisms may vary depending on factors such as concentration, temperature, and the specific microorganism being targeted, 10 minutes is a commonly cited duration for effective disinfection.

It is important to note that endospores, which are highly resistant structures formed by certain bacteria, are not easily killed by chlorine. Endospores have a protective outer layer that shields them from the disinfecting effects of chlorine, requiring more prolonged exposure or alternative disinfection methods to eliminate them effectively.

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Answer:

the answer is B

Explanation:

please tell if correct or not and can you give brainliest

Answer:

well i would say D

Explanation:

the crust in fact does have more iron within in it but if i describe it more i would say the crust is a smaller amount then the mantle, and that its a bit harder material then the mantle itself

Answer:

Unlike other temperature scales of the time, Celsius based his on the freezing and boiling points of water, with 0° as the boiling point and 100° as the freezing point. After he died from tuberculosis in 1744, that scale was reversed, creating the scale still used today.

4th pic is solid, gas

and the other one is further apart; increase

5th pic for second question is D

and the first question is kinetic energy

yw bakugo

122 L of oxygen is produced at STP when water is decomposed to the reactants. here decomposition reaction occurs.

Decomposition Reaction is the process or effect of simplifying a single chemical entity into two or more fragments. Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis. Decomposition reaction of water can be written as,

        2H2O  → 2H2 + O2

Oxygen is produced at STP when 6.58 x 1024 molecules of water is decomposed. So there will be,

      0.5 × 6.58 × 1024

     = 3.29 × 1024  O2 molecules.

1mole = 6.02×1023 particles, so the amount produced is:

     = 3.29×1024 / 6.02×1023

     = 5.47mole

At an STP of 273K, 1atm the volume is 22.4L/mole

So the volume of oxygen is 5.47 × 22.4 = 122L

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The function of a power source in an electric circuit is to  provide a steady flow of electrons.

An electric circuit comprises of individual electronic components like resistors, diodes,transistors , capacitors,etc. which are connected to each other by means of wires through which electric current flows.It can also be referred to as an electronic circuit.

It usually comprises of at least one active component . The combination of wires and simple and complex components allows operations to be performed, amplification of signals, displacement of data and performing of computations.

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Answer:  a steady flow of electrons

Explanation:

\(C_3H_6\)  has a double bond in its carbon skeleton. This is a true statement.

Carbon skeleton refers to the chain of carbon atoms that make up an organic molecule. The presence or absence of double bonds in the carbon skeleton affects the properties of the molecule and how it interacts with other molecules. In \(C_3H_6\), there are three carbon atoms arranged in a linear chain, with each carbon atom forming single covalent bonds with two hydrogen atoms. The remaining valence electrons on each carbon atom form a double bond between the first and second carbon atoms.

This double bond is responsible for the unsaturated nature of the molecule. \(C_3H_6\)is an example of a simple alkene, also known as propene. Its carbon skeleton and double bond make it a versatile molecule that can be used in various applications, including the production of plastics, rubber, and other materials.

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Answer: A

Explanation: Beta particles have a charge of -1

Yes, scientists can be more or less certain of their claims depending on the evidence they have.

This is because scientific claims are based on evidence and are subject to testing and evaluation. Scientists use various methods, such as experiments, observations, and data analysis, to gather evidence and test their claims. The more evidence a scientist has to support a claim, the more certain they can be of its validity.

However, even with strong evidence, scientific claims are always subject to revision or modification as new evidence becomes available. This is because scientific knowledge is constantly evolving and improving as new discoveries are made and old theories are revised or refined.

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Answer:

b

Explanation:

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Answer:

the rock weighs 3 millimeters