A chemist determined that a sample contains 20g of hydrogen and 320g of oxygen is this sample water or hydrogen peroxide?

The effects of volcanic eruption include acid rain and destruction of lives and property.

The term abiotic factors refers to those factors that are non living such as rainfall, topography, etc. The adaptation of organisms in avoiding unfavorable condition due to a change in abiotic factor is hibernation of a snake from September to December.

A volcanic eruption is a sudden outburst of molten magma from the earth's crust. The effects of volcanic eruption include acid rain and destruction of lives and property.

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if dfb = 3 and dft = 29 and fobt = 3.15, using the given we can can reject our null hypothesis, H_0.

Option (a) is the correct choice.

From the available information,

d fB=3, d fT=29, alpha=0.05, F_{obt}=3.15

Then, dfw = dfT-dfB = 29-3 = 26

In variance analysis, the F value is utilized (ANOVA). Two mean squares are divided to calculate it.

The ratio of explained variance to unexplained variance is calculated using this formula. A theoretical distribution is the F distribution.

In hypothesis testing, F Statistics are looked up using the F Table. Although it's more typical to perform tests using software like Excel or SPSS, the F Table might be helpful for rapidly searching up several data at once.

From the F-table,

The tabulated value at F_{0.05}(3,26) is 2.975.

Here the calculated value 3.15 is greater than the tabulated value 2.975,

So, we can reject our null hypothesis, H_0.

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The complete question should be like:

if dfb = 3 and dft = 29 and fobt = 3.15, what would you conclude using a = 0.05?

(a) reject  H_0

(b) reject  H_1

(c) retain  H_0

(d) retain  H_1

Na₂O is expected to have a higher melting point and boiling point than Na₂S.

In general, the lattice energy and the strength of the ionic connections between the component ions determine the melting and boiling temperatures of ionic compounds. The energy needed to split one mole of a solid ionic compound into its individual gaseous ions is known as the lattice energy. When compared to one another, Na₂S and Na₂O are both ionic compounds made up of a nonmetal anion (S²- or O²⁻) and a metal cation (Na⁺). The Na₂S molecule, on the other hand, has a lower lattice energy than Na₂O because the S2- ion is bigger than the O²⁻ ion.

Na₂S will have a lower melting and boiling point than Na₂O because it requires less energy to break the bonds between the ions in the solid due to its lower lattice energy. Because of this, it is anticipated that Na₂O will have a greater melting and boiling point than Na₂S. This prediction is supported by experimental data. While the melting temperature of Na₂S is only 950°C, that of Na₂O is 1275°C. Similarly, although Na₂S only reaches a boiling temperature of 1700°C, Na₂O reaches a boiling point of 1955°C. As a result, as compared to Na₂S, Na₂O has a greater melting and boiling point.

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Your question is in Spanish. The English translation is:

Justify which compound has a higher melting/boiling point, Na₂S or Na₂O.

Answer:

22.4L

Explanation:

not sure if its totally correct but I tried

Answer:

Solution A is neutral and Solution B is basic

Explanation:

Note it down

Answer:

the group 0 elements, the noble glass. are all unreactive ,non-metal gases . they show trends in their physical properties.

Explanation:

their uses depend on their inertness.

Add the bigger number twice or double it and then subtract 1 from it.

Doubles minus one is a strategy used to add two consecutive numbers. That is when two numbers are next to each other. Simply add the larger number twice, or double it and subtract 1 to get the final result. For example, here the consecutive numbers 7 and 8 are added using the double minus one strategy.

So the fact that the product of two negative numbers is positive is related to the fact that the reciprocal of a positive number return that positive number. Doubles Minus one is a strategy used to add two consecutive numbers. That is when two numbers are next to each other. Simply add the larger number twice or double it and subtract 1 to get the final result.

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Answer:

Explanation:

In order to have a full shell it needs eight. It is easier to gain three electrons instead of losing five. Therefore phosphorus tends towards P3−

Answer:

Didi you get it?we got the same class

Explanation:

Answer:

oxygen

Explanation:

plants and animals use oxygen

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Answer B

Explanation:

trust

The density of the object is 0.75 g/mL.

We must note that the ratio of the mas to the volume is the density of the object. We have to note that one of the ways to know the mass of the object is the displacement method. This is the method in which the volume of the fluid displaced is the volume of the object that we are trying to measure.

Thus;

Mass of the object = 15 grams

Volume of the object = 45 mL - 25 mL = 20 mL

Density of the object = 15 g/20 mL

= 0.75 g/mL

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Missing parts;

George put 25 mL of water into a graduated cylinder.After addinga solid object, the water level in the cylinder rose to 45 mL.What is thevolume of the object?

Connect one terminal of the battery to one terminal of the fuse using a wire. Connect the other terminal of the fuse to one terminal of each motor and the lamp using separate wires. Connect the other terminal of the battery to the other terminal of each motor and the lamp using separate wires.

To connect two motors and a lamp in parallel with a fuse and a battery, you will need the following components:

Two motors and a lamp

Battery with appropriate voltage and capacity

Fuse with appropriate amperage rating

Wires to connect the components

Here are the steps to connect the components:

Make sure that the connections are secure and do not come loose.

Test the circuit by turning on the battery and checking if the motors and the lamp turn on.

If there is too much current flowing through one motor, the fuse will melt and break the circuit, preventing damage to the motor and the rest of the circuit. It is important to choose the appropriate amperage rating for the fuse based on the maximum current that the motors and the lamp can handle.

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Note: the search engine could not find the complete question.

Answer:

21 g/mL

Explanation:

To solve this problem, first look at the density equation, which is D=M/V, which D stands for density, M stands for mass, and V stands for volume. When you substitute in the variables, you get D=17.5/.82, which is equivalent to 21.34. However, since we need to pay attention to the sig fig rules for multiplying, we need to have the same amount of sig figs as the value with the least amount of sig figs, which is the number .82. .82 has two sig figs, so you round down. Your answer will be 21 g/mL.

The Van't Hoff factor is the ratio of the concentration of particles in an ideal solution to the concentration of particles in a real solution. The ideal value of the Van't Hoff factor for aqueous solutions is as follows:
- C12H22O11: 2
- Na2SO4: 3
- CaCl2: 3
- NaCl: 2
- NH4Cl: 5

This is because the Van't Hoff factor is determined by the number of ions each solute releases when dissolved in water. C12H22O11 dissociates into two ions, Na2SO4 dissociates into three ions, CaCl2 dissociates into three ions, NaCl dissociates into two ions, and NH4Cl dissociates into five ions.The Van't Hoff factor can be defined as the ratio of the concentration of particles formed when a substance is dissolved to the concentration of the substance by mass. The extent to which a substance associates or dissociates in a solution is described by the Van't Hoff factor.

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The mass of 0.5 mole of the element is approximately 6.025 grams.

To calculate the mass of 0.5 mole of the element, we need to know the molar mass of the element.

Given that the mass of 2 x 10^21 atoms of the element is 0.4 grams, we can use this information to find the molar mass.

The number of atoms in 1 mole of any substance is given by Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.

First, we calculate the molar mass of the element using the given information:

Molar mass = Mass of 2 x 10^21 atoms / Number of moles of 2 x 10^21 atoms

Molar mass = 0.4 g / (2 x 10^21 atoms / (6.022 x 10^23 atoms/mol))

Molar mass ≈ 0.4 g / (3.32 x 10^-2 mol)

Molar mass ≈ 12.05 g/mol

Now that we know the molar mass of the element is approximately 12.05 g/mol, we can calculate the mass of 0.5 mole of the element:

Mass = Molar mass x Number of moles

Mass = 12.05 g/mol x 0.5 mol

Mass = 6.025 grams

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Answer:

Top right.

Explanation:

The Periodic Trend for Ionization Energy is up and to the right. Therefore, the highest ionization energy levels will be in the top right.

Noble gases like He and Ne would be examples of elements with extremely high ionization energy. Since their valence electron shells are full, they become core electrons and are stable. If you remove an electron, it would become unstable. Therefore, the element doesn't want to remove the electron, and would take a significant amount of joules to remove it.

This problem can be solved using Boyle's law:p1v1=p2v2

so 5.23*214=796*v2 v2=(5.23*214)/796=1.4L

Answer:

cell membrains

Explanation:

Answer:

\(\rm MgBr_2 \cdot 6\, H_2O\).

Explanation:

Let \(x\) denote the number of \(\rm H_{2}O\) formula units for every \(\rm MgCl_{2}\) formula unit. The formula of the hydrate would be \({\rm MgBr_2} \cdot x\, {\rm H_2O}\).

Look up the relative atomic mass of each element on a modern periodic table:

Formula mass:

\(\begin{aligned}M({\rm MgBr_{2}}) &= 24.305 + 2 \times 79.904 \\ &= 184.113\; \rm g\cdot mol^{-1}\end{aligned}\).

\(\begin{aligned}M({\rm H_{2}O}) &= 2 \times 1.008 + 15.999 \\ &= 18.015\; \rm g\cdot mol^{-1}\end{aligned}\).

The anhydrous compound would be \(\rm MgBr_{2}\). There was \(27.21\; \rm g\) of this compound. Calculate the number of moles of formula units in that much of this compound:

\(\begin{aligned}n({\rm MgBr_{2}}) &= \frac{m({\rm MgBr_{2}})}{M({\rm MgBr_{2}})} \\ &= \frac{27.21\; \rm g}{184.113\; \rm g \cdot mol^{-1}} \\ &\approx 0.1478\; \rm mol\end{aligned}\).

During heating, \(43.19\; \rm g - 27.21\; \rm g = 15.98\; \rm g\) of water \(\rm H_{2}O\) escaped from the hydrate. Calculate the number of formula units in that \(15.98\; \rm g\) of \(\rm H_{2}O\!\):

\(\begin{aligned}n({\rm H_{2}O}) &= \frac{m({\rm H_{2}O})}{M({\rm H_{2}O})} \\ &=\frac{43.19\; \rm g - 27.21\; \rm g}{18.015\; \rm g \cdot mol^{-1}} \\&= \frac{15.98\; \rm g}{18.015\; \rm g \cdot mol^{-1}} \\ &\approx 0.887\; \rm mol\end{aligned}\).

In other words, approximately \(0.1478\; \rm mol\) of \(\rm MgBr_{2}\) formula units (and hence the same number of moles of \({\rm MgBr_2} \cdot x\, {\rm H_2O}\) formula units) contain approximately \(0.887\; \rm mol\) of \(\rm H_{2}O\) formula units. Calculate the ratio between the two:

\(\begin{aligned}x &= \frac{n({\rm H_{2}O})}{n({\rm MgBr_2})} \\ &\approx \frac{0.1478\; \rm mol}{0.887\; \rm mol} \approx 6\end{aligned}\).

Hence, the formula of the hydrate would be \(\rm MgBr_2 \cdot 6\, H_2O\).

Answer:

A

Explanation:

Have a nice day

When ammonium chloride ( NH₄Cl ) is dissolved in water H₂O, it will dissociate into NH₄⁺ and Cl⁻ ions. The dissociation chemical reaction is NH₄Cl₍s₎ = NH₄⁺₍aq₎ + Cl⁻₍aq₎. NH₄⁺₍aq₎ +H₂O₍l₎ = NH₃₍aq₎ +H₃O+₍aq₎ H3O+ + OH⁻ = 2H₂O.

An atom or molecule with a net electrical charge is known as an ion. Conventionally, the charge of an electron is thought to be negative; this charge is equal to and opposite to the charge of a proton, which is thought to be positive.

Ions are electrically charged particles that can be created by either taking electrons away from neutral atoms to form positive ions or adding electrons to neutral atoms to produce negative ions. The quantity of protons remains constant during the formation of an ion.

Thus, When ammonium chloride ( NH₄Cl ) is dissolved in water H₂O, it will dissociate into NH₄⁺ and Cl⁻ ions.

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Future greater fires can be avoided by putting out ground fires, which are those that burn beneath the surface.

The correct answer is C

A ground fire is a particular kind of wildfire that starts underground when fuels like peat, coal, tree roots, or other buried organic debris catch fire and burn. Ground fires may end up burning through the ground's surface and turn into surface fires, depending on the circumstances of the fire.

Plant roots as well as other organic material ignited beneath the soil surface cause ground fires. Surface fires, which burn old or dried vegetation that is laying or growing slightly above the ground, might develop from these fires. On the contrary hand, crown fires consume the tree canopy.

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Answer:

NaOH is a strong base so strength of acid is not important.  The two heats of neutralisation per mole of NaOH should be the same as ALL neutralisations like this simplify to the same ionic equation:  H+. + OH- = H2O.

Explanation:

When the negatively charged metal ball comes in contact with the iron bar, the positive charges of the bar aligns near to the negative charges and they electrostatically attracts results in a static electricity.

When a negatively charged body is comes in contact with an conductor or an insulator, the random charges gets polarized, where the positive charges of the second object align with the negative charges and there occurs a flow of electron from the negatively charged object. This is called static electricity.

A metal in its neutral state contains a sea of positive ions and free electrons. Here, the when the negatively charged metal ball comes near the iron bar, the iron bar gets polarized.

The positive charges of the iron bar gets polarized near the negative charge of the ball and there occurs an electrostatic force of attraction. Electrons from the negative charged ball tends to flow to the conductive iron bar and leads to a static electricity.

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The correct option is A, the metal produced at the cathode would be Ag(s) because it has the highest reduction potential.

The correct option is A, You'll have to perform electrolysis on the molten salt because you can't get iron metal from the electrolysis of the aqueous solution.

The correct option is C, The aqueous salts that will produce hydrogen gas and oxygen gas during electrolysis are \(NiF_2(aq)\).

Electrolysis is a chemical process that uses an electric current to drive a non-spontaneous chemical reaction. It involves the decomposition of an electrolyte into its constituent ions when an electric current is passed through it. The process takes place in an electrolytic cell, which consists of two electrodes—an anode and a cathode—immersed in the electrolyte solution.

When the electric current flows through the electrolyte, positive ions migrate towards the cathode, while negative ions move towards the anode. At the electrodes, the ions undergo redox reactions. The cathode attracts positively charged ions and facilitates their reduction, while the anode attracts negatively charged ions and promotes their oxidation. This results in the separation and deposition of new substances at each electrode.

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