At 25 ∘C∘C calculate the pHpH of a solution in which [H3O+]=9.5×10−9M[H3O+]=9.5×10−9M.Express your answer to two decimal places.

Norman sliding his foot across the floor would create heat energy through friction (C)

When a person is sliding on the floor, the foot would rub against the floor. The process would result in friction between the feet and the floor.

In addition to that, the potential energy (resting energy) is getting converted to kinetic energy (energy resulting from motion). The difference between the energy of an object at resting state and motion would result in production of heat energy. This is caused mainly due to friction.

Thus, when Norman’s foot is sliding across the floor, it would create heat energy through friction.

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Answer:

plastic

Explanation:

plastic doesn't conduct electricity

Answer:

?????????

Explanation:

According to modern understanding, protons and neutrons are composed of elementary particles called quarks

Quarks are elementary particles that are considered to be the fundamental building blocks of matter. They are classified into different types or ""flavors"": up, down, charm, strange, top, and bottom.

A proton consists of two up quarks and one down quark, while a neutron consists of two down quarks and one up quark. These quarks are held together by the strong nuclear force, which is mediated by particles called gluons. The interaction between the quarks and gluons gives rise to the overall properties and behavior of protons and neutrons.

It is important to note that quarks are never observed in isolation but are always found in combinations known as hadrons. Protons and neutrons are examples of hadrons, specifically baryons, which are composed of three quarks. The up and down quarks are the lightest quarks and are stable under normal conditions, making them the predominant constituents of protons and neutrons.

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CrO and Cr₂O₃ make up the simplest chromium oxide formula.

What name does Cr₂O₃ use?

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Answer:

we know that it was the vinegar and baking soda because gas had been created, the gas was held within the bubbles. the gas that was created was called Carbon Dioxide or CO2

Answer:

Aluminum atoms are in 3.78 g of aluminum

02214076x10^23)8.4367659370640769254888x10^22 atoms, therefore there are 8.4367659370640769254888x10^22 atoms of Aluminum(Al) present in 3.78 grams of Aluminum(Al).

Explanation:

Answer:

\(\boxed {\boxed {\sf 3. \ H-H}}\)

Explanation:

To determine the polarity of a bond, we use the electronegativities of the individual atoms. The greater the difference, the more polar the bond.

1. H-Br

3.0-2.2=0.8

2. H-F

4.0-2.2=1.8

3. H-H

2.2-2.2=0.0

4. H-O

3.4-2.2=1.2

As we can see, the lowest difference is in hydrogen hydrogen at 0.0. You may also recognize that because they are 2 atoms of the same element, the electronegativity is the same for both, so it will equal 0. Since the electronegativity is 0, this is a nonpolar bond.

Answer:

30.83 M

Explanation:

17.03052 re in one mole. So, if you multiply it by 30.83, you will get 535 g of ammonia.

In fact, the detailed answer is 30.827009392549122.

0.750 tsp of baking soda in grams would be  4.49 grams.

From the available information:

If, 1 tsp of baking soda = 0.211 oz, then 0.750 tsp of baking soda would be:

 0.750 x 0.211 = 0.15825 oz

Thus, 0.750 tsp of baking soda is equivalent to 0.15825 oz of baking soda.

If 1 oz = 28.35 grams, then 0.15825 oz of baking soda will be:

28.35 x 0.15825 = 4.49 grams

In other words, 0.750 tsp of baking soda would be worth 4.49 grams of baking soda going by the available conversion factors.

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0.24 g of LiOH are needed to make 100 ml of a 0.1 m solution.

Lithium hydroxide (LiOH), commonly obtained by the reaction of lithium carbonate with lime, is used in making lithium salts (soaps) of stearic and other fatty acids; these soaps are widely used as thickeners in lubricating greases.

Lithium hydroxide is an inorganic compound with the formula LiOH. It can exist as anhydrous or hydrated, and both forms are white hygroscopic solids. They are soluble in water and slightly soluble in ethanol. Both are available commercially.

LiOH (Lithium hydroxide) is a base. It is because it releases OH– (hydroxide-ion) in water. According to theories, a substance that can accept a proton or donate electrons or react with acid is classified as a base. LiOH reacts with strong acid HCl that produce LiCl and water.

The molarity of LiOH is 0.1M

The given volume is,

M = W1 × 1000/m1 × V(ml)

m1 = molecular mass of LiOH = 24

putting the values in the previous equation,

0.1 = W1 × 1000/24 × 100

W1 = 0.1 × 24 ×100/1000

⇒ 0.24 grams of LiOH is required.

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Answer

Explanation

Atomic mass =  abundances1 x relative mass 1+ abundances 2 x relative mass 2 ...etc

   =  ( 60.4% x 68.9257 + 39.6% x 70.9249)

    = 0.604 x 68.9257  +  0.396 x 70.9249)

     =  69.72 amu

The element with 2 isotopes, one representing 60.4 % of the atoms (68.9257 amu) and the other representing the rest (70.9249 amu), has an atomic mass of 69.7 amu. The element is Gallium.

An element has 2 isotopes. The sum of their abundances is 100%. If the abundance of isotope 1 is 60.4%, the abundance of isotope 2 is:

\(ab_1 + ab_2 = 100 \% \\ab_2 = 100\% - ab_1 = 100 \% - 60.4 \% = 39.6 \%\)

Isotope 1 has an abundance of 60.4% and a mass of 68.9257 amu, while Isotope 2 has an abundance of 39.6% and a mass of 70.9249 amu. The atomic mass is the weighted average of the mass by the abundance.

\(am = \frac{68.9257 amu \times 60.4 + 70.9249 amu \times 39.6 }{100} = 69.7 amu\)

The element with this atomic mass is Gallium.

The element with 2 isotopes, one representing 60.4 % of the atoms (68.9257 amu) and the other representing the rest (70.9249 amu), has an atomic mass of 69.7 amu. The element is Gallium.

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The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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Answer:

It's basically a positive charged atom.

Explanation:

To synthesize 1-bromo-3-chlorobenzene starting from benzene, a multi-step process would be required. This process would involve several reactions to introduce the bromo and chloro groups onto the benzene ring.

The first step would be to introduce a nitro group onto the benzene ring via nitration using a mixture of concentrated nitric acid and sulfuric acid. The nitro group would then be reduced to an amino group using a reducing agent such as iron and hydrochloric acid.

Next, the amino group would be diazotized using sodium nitrite and hydrochloric acid to form a diazonium salt. This diazonium salt would then be coupled with cuprous chloride to form a chlorobenzene ring.

Finally, the chlorobenzene would be further reacted with sodium bromide and hydrobromic acid to replace the chlorine atom with a bromine atom, forming 1-bromo-3-chlorobenzene. Overall, this synthesis would require several steps and careful control of reaction conditions to ensure high yields and purity of the desired product.

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The true statement about exothermic reactions is: the energy in the system is less once the reaction makes products.

option B.

Exothermic reactions are those reactions in which energy is released into the surroundings.

This energy release results in a decrease in the internal energy of the system, which means that the energy in the system is less after the reaction than before.

Also, the decrease in energy corresponds to an increase in stability of the system. Therefore, in an exothermic reaction, the energy of the products is less than the energy of the reactants.

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Answer: Your skin is your largest organ—22 square feet on average— Cleansers and body washes—might actually be doing us more harm than good, but, unfortunately, it absorbs harmful chemicals we put on it, too.

Explanation: Some are bad like scented body wash and hair stuff. But unscented is WAY better than scented, I learned that the hard way...

Answer:

construction aka A

Explanation:

got 100

Answer:

D)

Explanation:

CH4 + 2O2 = CO2 + 2H2O

1 (L CO2)= 32.5(L CO2)

1 (CH4) = 32.5 (L CH4)

The mass percentage of acetic acid in this vinegar sample is 1.00 %

Density is the size of ways tightly a fabric is packed collectively. it is described as the mass consistent with unit quantity. Density image: D or ρ Density system: ρ = m/V, wherein ρ is the density, m is the mass of the object and V is the quantity of the item.

Density is the substance's mass per unit of volume. The image most usually used for density is ρ, despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by using volume Density is the mass of an object divided by using its extent. Density frequently has gadgets of grams according to cubic centimeters (g/cm3).

Calculation:-

Acetic Acid = 0.03 mol

moles of Gram of Acetic acid=moles x molar mass.

= 0.03 mol x 60 mol

Now, as De 1.8g Density = 1.00

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Sorry If This Is Late***

Elements can't be broken down, into a simplre set of properties. They are one strict unit & cannot be broken down, however they can be added together to make a compound.

HOPE THIS HELPS & good luck <3 !!!!!

When 3.5 moles of methane gas undergo a combustion reaction, 3116.4 kJ of heat is released.

The thermochemical equation for the combustion of methane gas is as follows:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)  ΔH = -890.4 kJ/mol
This equation tells us that for every mole of methane gas that is burned in the presence of oxygen, 890.4 kJ of heat is released. Now, we need to calculate how much heat is released when 3.5 moles of methane gas undergo combustion.
To do this, we simply need to multiply the number of moles of methane by the heat of combustion per mole:
ΔH = (-890.4 kJ/mol) x (3.5 mol) = -3116.4 kJ
Therefore, when 3.5 moles of methane gas undergo a combustion reaction, 3116.4 kJ of heat is released. It's important to note that this calculation assumes that the reaction takes place under standard conditions (i.e. at 25°C and 1 atm pressure) and that all reactants and products are in their standard states.

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The three common driving forces for chemical reactions are: Formation of a stable compound, Formation of a less stable compound, and Formation of a gas or solid and observations accompanying them includes changes in temperature, color, pressure, and/or the formation of a gas.

Formation of a stable compound: This occurs when two or more reactants combine to form a product that is more stable than the reactants. This can be observed by a decrease in energy and/or the release of heat or light.

Formation of a less stable compound: This occurs when a reactant breaks down into simpler products that are less stable than the reactant. This can be observed by an increase in energy and/or the absorption of heat or light.

Formation of a gas or solid: This occurs when a reactant or product forms a gas or solid, which can drive the reaction forward by removing products from the reaction mixture. This can be observed by a change in color or the formation of a precipitate.

Observations that may accompany these driving forces include changes in temperature, color, pressure, and/or the formation of a gas or precipitate. For example, the formation of a gas may be observed as bubbles forming in a solution, the formation of a precipitate may be observed as a cloudy appearance, and a change in color may indicate a change in the electronic structure of the reactants or products.

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Answer:

The reaction will proceed in the reverse direction

Explanation:

Now consider the equation;

CaCO3(s) ⇄CO2(g) + CaO(s)

This is a reversible reaction. The reaction could proceed in either the forward or the reverse reaction depending on the conditions of the reaction. Under certain conditions, the forward reaction is favoured, under certain conditions, the reverse reaction is favoured.

The direction in which the reaction proceeds depends on the desired products as the equilibrium position could be manipulated at will by altering the reaction conditions. If the desire is to produce more CaCO3, then the equilibrium position is manipulated so that it shifts towards the left hand side. This implies that the reverse reaction is favoured.

Answer:

As an indicator

Answer:

Explanation:

budding

Figure 13.3 (a) Hydra reproduce asexually through budding: a bud forms on the tubular body of an adult hydra, develops a mouth and tentacles, and then detaches from its parent. The new hydra is fully developed and will find its own location for attachment.

The electron configuration of an atom describes the arrangement of its electrons in various energy levels and orbitals. Electrons occupy the lowest available energy levels and follow certain rules.

a. Chlorine has 17 electrons. Its electron configuration is \(1s_2 2s_2 2p_6 3s_23p_5\) . The ion that chlorine most commonly forms is the chloride ion, \(Cl^-\). This ion gains one electron to achieve a noble gas configuration. The electron configuration of \(Cl^-\) is the same as that of argon: \(1s_2 2s_2 2p_6 3s_2 3p_6\).

b. Oxygen has 8 electrons. Its electron configuration is \(1s_2 2s_2 2p_4\). The ion that oxygen most commonly forms is the oxide ion, \(O_2^-\). This ion gains two electrons to achieve a noble gas configuration. The electron configuration of \(O_2^-\)is the same as that of neon: \(1s_22s_22p_6\).

c. Aluminum has 13 electrons. Its electron configuration is \(1s_2 2s_2 2p_6 3s_2 3p_1\) The ion that aluminum most commonly forms is the aluminum ion, \(Al_3^+\). This ion loses three electrons to achieve a noble gas configuration. The electron configuration of \(Al_3^+\) is the same as that of neon: \(1s_2 2s_2 2p_6\).

d. Barium has 56 electrons. Its electron configuration is \(1s_2 2s_2 2p_6 3s_2 3p_6 4s_2 3d_10 4p_6 5s_2 4d_10 5p_6 6s_2\). The ion that barium most commonly forms is the barium ion,\(Ba_2^+\). This ion loses two electrons to achieve a noble gas configuration. The electron configuration of \(Ba_2^+\) is the same as that of xenon: \(1s_2 2s_2 2p_6 3s_2 3p_6 4s_2 3d_10 4p_6\).

e. Selenium has 34 electrons. Its electron configuration is \(1s_2 2s_2 2p_6 3s_2 3p_6 4s_2 3d_10 4p_4\). The ion that selenium most commonly forms is the selenide ion, \(Se_2^-\). This ion gains two electrons to achieve a noble gas configuration. The electron configuration of \(Se_2^-\)is the same as that of argon: \(1s_2 2s_2 2p_6 3s_2 3p_6\).

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The statement that "there are many types of energy" is correct. Energy is a fundamental concept in science and refers to the ability of a system to do work or cause a change. There are many different types of energy, each with its own characteristics and properties.

One of the most familiar forms of energy is light energy, which is produced by the sun and other sources of radiation. Sound energy is another form of energy that is produced by vibrations in matter, and it can be detected by the human ear. Thermal energy is the energy associated with the temperature of an object, and it is related to the movement of atoms and molecules within that object.

Chemical energy is stored in the bonds between atoms and molecules, and it is released during chemical reactions. Electrical energy is associated with the movement of electrons through a conductor, and it is used to power many of the devices we use every day. Other forms of energy include nuclear energy, gravitational energy, and kinetic energy.

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ANSWER

there are 20 number of atoms in compound

Explanation:

In a formula unit of Mg(OH)2, there are one magnesium ion and two hydroxide ions; or one magnesium, two oxygen, and two hydrogen atoms.