One of the legs of a right triangle measures 7 cm and its hypotenuse measures 9 cm. find the measure of the other leg. if necessary, round to the nearest tenth

Answer:What is happening to voltage-gated channels at this point in the action potential? Na+ channels are inactivating, and K+ channels are opening. Na+ channels are inactivating, and K+ channels are closing.

Engineers carefully choose the "shape" and "material" to control sound waves.

The shape of a room, object, or device can affect how sound waves travel, reflect, and interfere with each other. Engineers use principles of acoustics to design spaces and objects that can control the propagation of sound waves, for example, to prevent echoes or to create a desired acoustic environment.

The material of a surface can also affect how sound waves behave when they interact with it. Some materials absorb sound, while others reflect it, and the choice of material can have a significant impact on the acoustics of a space. Engineers select materials based on their acoustic properties to achieve the desired sound control or quality.

herbivore: cow

carnivore: lion

omnivore: bear

decomposer: water mold

Answer:

rabbit, kingfisher,lizard, fungi

Explanation:

hrbivore is an organism which feeds on plants. carnivore is also an organism that feeds on other organism. omnivore is also an organism that feeds on other organisms. Decomposers arsle organisms that recycle nutrients.

The reaction of NaN3 and H2O, upon heating, results in the formation of NaNH2 and HN3. There is no organic product formed in this reaction as neither of the reactants is an organic compound, and the products are inorganic compounds.

NaN3 is sodium azide, which is a common reagent used in organic synthesis for the preparation of primary amines, among other things. HN3 is hydrazoic acid, which is a weak acid and a highly toxic and explosive compound. NaNH2 is sodium amide, which is a strong base used in organic synthesis for deprotonation reactions.

The reaction between NaN3 and H2O is an example of an inorganic reaction that is important in the preparation of inorganic compounds and is not relevant to organic synthesis.

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The reaction of NaN3 and H2O, upon heating, results in the formation of NaNH2 and HN3. There is no organic product formed in this reaction as neither of the reactants is an organic compound, and the products are inorganic compounds.

NaN3 is sodium azide, which is a common reagent used in organic synthesis for the preparation of primary amines, among other things. HN3 is hydrazoic acid, which is a weak acid and a highly toxic and explosive compound. NaNH2 is sodium amide, which is a strong base used in organic synthesis for deprotonation reactions.

The reaction between NaN3 and H2O is an example of an inorganic reaction that is important in the preparation of inorganic compounds and is not relevant to organic synthesis.

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Answer:Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)

O2Zn(s) + H2SO4(aq) → 22nH(aq) + SO4(s)

Explanation:

A reaction where one element gets substituted by another is called a single replacement reaction. The balanced equation reaction is Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g). Thus, option B is correct.

A single-displacement reaction is a replacement reaction where the element from a compound gets substituted or replaced by another element from the reactant to produce a product.

The replacement or the substitution is based on the reactivity or the activity series. The element with more strength will replace the element that is weak and has lower strength.

The balanced single-displacement reaction is given as,

Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)

Here, zinc has more reactivity capability than hydrogen and hence replaces to produce zinc sulfate.

Therefore, option B. Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g) is the balanced equation.

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The density of the smaller piece of the glass stirring rod is 1.5 g/cm³.

Given that the density of the glass stirring rod is 1.500 g/cm³. The rod is broken into two parts, one part is 10 cm long and the other is 5 cm long. We need to calculate the density of the smaller piece.

Let's use the formula of density here.

The formula of density is given by,

ρ = m/V

Where,

ρ is the density of the substance

m is the mass of the substance

V is the volume of the substance

For the smaller piece of the rod, the volume and mass can be calculated as follows:

Length of the smaller piece of rod = 5 cm

Density of the glass stirring rod = 1.500 g/cm³

Volume of the smaller piece of rod = (5 cm)³ = 125 cm³

The density of the smaller piece can be calculated as:

m = ρ x Vρ = m/Vm = ρ x Vm = 1.5 x 125 m = 187.5 g

Now,ρ = m/Vρ = 187.5 g / 125 cm³ρ = 1.5 g/cm³

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ANSWER

EXPLANATION

Given that

The number of moles lithium bromide is 5.5 moles

Firstly, write a balanced equation for the reaction

Find the number of moles of bromine using stoichiometry ratio

Let x represents the number of bromine

Caution your lab partners to avoid the area while you inform the teacher of the small accident best explains what you should do in lab .

Option C is correct .

As per the lab security rules, in the event that you unintentionally broke a test tube and spilled a synthetic on the table you ought to alert your lab accomplices to stay away from the area while you illuminate the educator regarding the little mishap.

We ought to adhere to the guidelines for lab safety. We ought to clean the synthetic assuming we absolutely have some familiarity with the compound. Cleaning with water is absolutely perilous as you most likely are aware adding water to concentrated arrangement cause fire in the lab or very exothermic response happen. Using water to clean the spill is very risky. A good first step is to dispose of the test tube in a special container. Some chemicals have a strong odor and are extremely poisonous. so its exceptionally hazardous tossing the sharp test tube glass pieces into container without removal is perilous

Incomplete question :

You have accidentally broken a test tube and spilled a chemical on the table. Which of the following best explains what you should do?

A. Throw the glass into the nearest trash bin and let the spill dry

B.  Quickly dispose of the glass, wipe up the spill with the nearest cloth, and hope nobody notices

C. Caution your lab partners to avoid the area while you inform the instructor of the small accident

D. Use water and paper towels to clean up the spill; place the broken test tube in the disposal container specified by the instructor for sharp objects

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Answer:

Biosphere

The Biosphere --contains all the planet's living things. This sphere includes all of the microorganisms, plants, and animals of Earth. Within the biosphere, living things form ecological communities based on the physical surroundings of an area.

Explanation:

Answer:

Biosphere

Explanation:The Biosphere --contains all the planet's living things. This sphere includes all of the microorganisms, plants, and animals of Earth. Within the biosphere, living things form ecological communities based on the physical surroundings of an area. hope this helps (:

Answer:

The EF of the compound is CH2O and the MF is C6H12O6.

Explanation:

To find the empirical formula (EF) of the compound, we need to determine the simplest whole number ratio of the atoms in the compound. We can assume we have 100 g of the compound, which means we have:

40 g of carbon

6.67 g of hydrogen

53.33 g of oxygen (since the rest of the compound is oxygen)

Next, we can convert the masses to moles:

Moles of carbon = 40 g / 12.01 g/mol = 3.33 mol

Moles of hydrogen = 6.67 g / 1.01 g/mol = 6.61 mol

Moles of oxygen = 53.33 g / 16.00 g/mol = 3.33 mol

We then divide each of the mole values by the smallest number of moles, which is 3.33, to get the simplest whole number ratio:

Carbon: 3.33 / 3.33 = 1

Hydrogen: 6.61 / 3.33 = 1.98 (rounded to 2)

Oxygen: 3.33 / 3.33 = 1

So the EF of the compound is CH2O.

To find the molecular formula (MF), we need to know the molecular mass of the EF. The empirical formula mass (EFM) of CH2O is:

EFM = (1 x 12.01 g/mol) + (2 x 1.01 g/mol) + (1 x 16.00 g/mol) = 30.03 g/mol

We can then calculate the molecular formula mass (MFM) by dividing the given molecular mass (180 g/mol) by the EFM:

MFM = 180 g/mol / 30.03 g/mol = 6

This means the MF is 6 times the EF, or C6H12O6. Therefore

Answer:

37 %.

Explanation:

¡Hola!

En este caso, para el problema descrito, conocemos la corriente de entrada y la de salida del agua, por lo que podemos obtener el flujo de la corriente que contiene el zumo a la salida una vez el agua fue evaporada:

\(F_{sol}=11500kg/dia-3000kg/dia=8500 kg/dia\)

Luego, por medio de un balance de zumo de limón en el evaporador en el cual la cantidad que entra es igual a la que sale con sus respectivas concentraciones:

\(x_z^{entra}*11500kg/dia=x_z^{sale}*8500kg/dia\)

Como la concentración del zumo a la salida es del 50 % (0.50), la de entrada es:

\(x_z^{entra}=\frac{x_z^{sale}*8500kg/dia}{11500kg/dia} =\frac{0.50*8500kg/dia}{11500 kg/dia}\\ \\x_z^{entra}=0.37\)

Que es igual al 37%.

¡Saludos!

Answer:

Intermolecular forces determine bulk properties, such as the melting points of solids and the boiling points of liquids. Liquids boil when the molecules have enough thermal energy to overcome the intermolecular attractive forces that hold them together, thereby forming bubbles of vapor within the liquid.

There are 1.81 × 10^24 caffeine molecules (C₈H₁₀N₄O₂) in 3 moles of C₈H₁₀N₄O₂.

One mole of a substance has 6.022 × 10²³ particles. This number is known as Avogadro's number. The molecular mass of caffeine is 194.19 g/mol. Thus, 3 moles of caffeine have a mass of 3 × 194.19 = 582.57 g. Moles = Mass/Molecular mass = 582.57 g / 194.19 g/mol = 3 moles. 1 mole of caffeine contains 6.022 × 10²³ molecules. Thus, 3 moles of caffeine contain 3 × 6.022 × 10²³ = 1.81 × 10²⁴ molecules.

Caffeine has the chemical formula C₈H₁₀N₄O₂. Therefore, 1 molecule of caffeine contains 8 carbon atoms, 10 hydrogen atoms, 4 nitrogen atoms, and 2 oxygen atoms. Therefore, the total number of atoms in one molecule of caffeine = 8 + 10 + 4 + 2 = 24. Hence, 3 moles of caffeine will contain 1.81 × 10²⁴ caffeine molecules x 24 atoms/molecule = 4.34 × 10²⁵ atoms.

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This problem is providing the basic dissociation constant of ibuprofen (IB) as 5.20, its pH as 8.20 and is requiring the equilibrium concentration of the aforementioned drug by giving the chemical equation at equilibrium it takes place. The obtained result turned out to be D) 4.0 × 10−7 M, according to the following work:

First of all, we set up an equilibrium expression for the given chemical equation at equilibrium, in which water is omitted for it is liquid and just aqueous species are allowed to be included:

\(Kb=\frac{[IBH^+][OH^-]}{[IB]}\)

Next, we calculate the concentration of hydroxide ions and the Kb due to the fact that both the pH and pKb were given:

\(pOH=14-8.20=5.80\)

\([OH^-]=10^{-5.8}=1.585x10^{-6}M\)

\(Kb=10^{-5.20}=6.31x10^{-6}\)

Then, since the concentration of these ions equal that of the conjugated acid of the ibuprofen (IBH⁺), we can plug in these and the Kb to obtain:

\(6.31x10^{-6}=\frac{(1.585x10^{-6})(1.585x10^{-6})}{[IB]}\)

Finally, we solve for the equilibrium concentration of ibuprofen:

\([IB]=\frac{(1.585x10^{-6})(1.585x10^{-6})}{6.31x10^{-6}}=4.0x10^{-7}\)

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Na+ and Cl- are spectator ions for the reaction that occurs when aqueous solutions of \(Na_{2}CO_{3}\) and \(HCl\) are mixed.

D is the correct answer.

The reaction is given as:

\(Na_{2} CO_{3} (aq) + 2HCl_{(aq)}\) → \(2NaCl_{(aq)} + CO_{2} (g) + H_{2}O_{(l)}\)

The net ionic equation is:

\(CO_{3} ^{2-} + 2H_{3}O^{+}\) → \(CO_{2} _{(g)} + 3H_{2} O_{(l)}\)

A spectator ion is an ion that can be found in a chemical equation as both a reactant and a product. Therefore, a spectator ion can be seen in the reaction between aqueous solutions of sodium carbonate and copper(II) sulphate without changing the equilibrium.

These ions are present in both directions of chemical processes but do not participate in them. The spectator ions are cancelled from both sides of the equation in the net chemical reaction.

The presence of sodium and nitrate ions can be determined by comparing the two solutions before and after the reaction. They don't go through any kind of chemical alteration at all. These ions are known as spectator ions since they have zero involvement in the chemical reaction.

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Answer:

Balloon filled with helium is not a mixture because the gas in it consists of solely helium atoms.

Explanation:

Explanation:

An element is a pure substance as well, because if we fill up a balloon with just helium gas, it will only contain helium atoms.

A substance with weak intermolecular forces vaporizes more easily and therefore has a low vapor pressure. (option 1)

The strength of intermolecular forces between molecules determines how tightly they are held together in the liquid state. In general, substances with weaker intermolecular forces require less energy to break the bonds holding them together and vaporize more easily. As a result, they have a higher tendency to escape into the gas phase and have a higher vapor pressure.

On the other hand, substances with stronger intermolecular forces require more energy to overcome the forces holding them together and have a lower tendency to vaporize. Therefore, they have a lower vapor pressure. So, the correct statement is "A substance with weak intermolecular forces vaporizes more easily and therefore has a low vapor pressure."

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Complete Question:

which statement correctly describes the relationship between intermolecular forces and the vapor pressure of a substance? multiple choice question.

12.5 grams of sucrose must be added to 375 grams of water to prepare a 2.5% solution of sucrose.

To prepare a 2.5% solution of sucrose, you would need to dissolve 2.5 grams of sucrose in every 100 mL of solution.

First, you need to determine how many milliliters of solution you want to prepare. Let's assume you want to prepare 500 mL of solution.

2.5 grams of sucrose in 100 mL of solution can be written as:

2.5 g/100 mL

To find out how many grams of sucrose you need for 500 mL of solution, you can use the following proportion:

2.5 g/100 mL = x g/500 mL

Cross-multiplying, you get:

100x = 2.5 * 500

Simplifying, you get:

100x = 1250

Dividing both sides by 100, you get:

x = 12.5

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There are 8.25 x \(10^{22}\) atoms per cubic centimeter of solid Cr.

First, find the number of moles of Cr per cubic centimeter by using the density of Cr The formula for density is:

density = mass/volume

Now, by rearranging this formula to find the mass, and then use the molar mass of Cr to find the no. of moles:

mass = density x volume

moles = mass / molar mass

The volume of 1 cubic centimeter = \(1 cm^3\).

The molar mass of Cr is 51.9961 g/mol.

So,

mass = \(7.15 g/cm^3\) x \(1 cm^3\) = 7.15 g

moles = 7.15 g / 51.9961 g/mol = 0.1373 mol

Next, we can find the number of atoms per mole of Cr. One mole of Cr contains Avogadro's number of atoms, which is 6.022 x \(10^{23}\) atoms/mol. So,

number of atoms = Avogadro's number x moles

= 6.022 x \(10^{23}\) atoms/mol x 0.1373 mol

= 8.25 x \(10^{22}\) atoms

Therefore, there are 8.25 x \(10^{22}\) atoms per cubic centimeter of solid Cr.

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Two non-metals become more stable by sharing valence electrons and forming covalent compounds.

Covalent compound is defined as a type of compound which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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Answer:

b:   Neither atoms will have a full valence shell

Explanation:

I think sooo

Chapter One of the book "The Disappearing Spoon" by Sam Kean is titled "Ruthenium, Rhodium, and Palladium." This chapter explores the fascinating history, properties, and uses of these three elements from the periodic table.

The chapter begins with the story of a chemical spill in the town of Norilsk, Russia, which is home to the world's largest nickel mine. The spill caused massive environmental damage and raised concerns about the toxic effects of metals.

This incident sets the stage for the exploration of elements that possess unique properties and have played significant roles in scientific and industrial advancements.

The author then introduces the readers to the periodic table and its significance in understanding the behavior and characteristics of elements. He explains the arrangement of elements and how they are grouped based on their chemical properties.

Moving on, Kean delves into the history and properties of ruthenium, rhodium, and palladium. He shares interesting anecdotes about their discoveries, including the challenges faced by scientists in isolating and identifying these elements. The author highlights the rarity and value of these metals and their importance in various fields, such as catalysis, electronics, and jewelry making.

Furthermore, Kean discusses the cultural and societal impact of these elements, including their use in the automotive industry, where palladium plays a crucial role in catalytic converters. He also explores the darker side of these elements, such as their involvement in illegal activities, including theft and smuggling.

Overall, Chapter One of "The Disappearing Spoon" provides an engaging introduction to the world of elements and sets the stage for further exploration of the periodic table and its fascinating stories.

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The specific heat capacity of a substance is the amount of heat needed to elevate it by 1 degree kelvin per gram. The easier it is for something to heat up, then, the smaller the heat capacity. We would suppose that a cook in a hurry would want a pan that heats up more quickly and would choose one with a lesser heat capacity.

0.385 for copper and 0.900 for aluminum.

Despite using non-SI units, we can still compare using it. It is obvious to him that copper has a lower specific heat, so he will pick that.

In case you're curious, you can also approach this issue from the perspective of heat conduction. To do this, look up the thermal conductivities of each material, and then apply Fourier's rule of heat conduction to determine that Copper would be best.

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De acuerdo con la imagen, podemos inferir que el vapor de etanol está ejerciendo presión sobre el agua que está en el conducto causando que esta se desplace.

En la imagen se ven dos recipientes con etanol líquido. Una de ellas está experimentando un aumento de calor que causa que las moléculas de etanol comiencen a moverse más rápido. Adicionalmente, las convierten en etanol gaseoso. Estas moléculas de etanol gaseoso hacen que el agua que está contenida en el conducto del recipiente se desplace como resultado de la presión del etanol.

English Version

Based on the image, we can infer that the ethanol vapor is exerting pressure on the water that is in the conduit, causing it to move.

What is seen in the image?

In the image you can see two containers with liquid ethanol. One of them is experiencing a rise in heat that causes the ethanol molecules to start moving faster. Additionally, the configurations in gaseous ethanol. These gaseous ethanol molecules cause the water that is contained in the conduit of the container to move as a result of the pressure of the ethanol.

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Answer:

That would be a community.

Explanation:

A field of many different species of wildflowers is considered to be a community.

It is called biological community meaning an interacting  group of various species sharing a common location.Factors which determine overall structure of community  are number of species, abundance of each species,interaction among the species and community's ability to return to normal after a natural calamity.

Change of communities over a period of  time is called as ecological succession.Each species in a community has its own characteristic niche . The niche includes all the interactions of the species with other members of the community.An ecosystem comprises of biological community together with its physical environment.

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Answer:

It is a chromebook laptop

Explanation:

Answer:

65.8 miles

Explanation:

The ranking from highest to lowest fraction of remaining nuclei after 1 hour is:
Sample D, Sample C, Sample B, Sample A.

To rank the four radioactive samples in order of what fraction of the original nuclei remains after 1 hour, we need to understand the concept of half-life. The half-life of a radioactive substance is the time it takes for half of the original nuclei to decay.

To solve this problem, we need to know the half-life of each sample. Let's assume the half-lives are as follows:
- Sample A: 10 minutes
- Sample B: 30 minutes
- Sample C: 1 hour
- Sample D: 2 hours

Since we are looking for the fraction remaining after 1 hour, we need to determine how many half-lives occur in that time period. As each half-life passes, the amount of remaining nuclei is halved.

Based on the given half-lives, here is the ranking:
1. Sample D: After 1 hour, there would be 0.5 half-lives, leaving 50% of the original nuclei remaining.
2. Sample C: After 1 hour, there would be 1 half-life, leaving 50% of the original nuclei remaining.
3. Sample B: After 1 hour, there would be 2 half-lives, leaving 25% of the original nuclei remaining.
4. Sample A: After 1 hour, there would be 6 half-lives, leaving 1.56% of the original nuclei remaining.

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