a man is 72 inches tall, what is his height in meters? round to three significant figures.​

Answer:

C

Explanation:

hydrogen Bond exists between ammonia, hydrogen flouride and water so the answer is C

Answer:

The answer is C

Explanation:

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Answer:

C. Seven colors of the rainbow

Explanation:

when light enters a water droplet and then leaves it again, each different wavelength of light refracts at a slightly different angle. then, when the light is broken up, you can see all of the colors of the rainbow.

For Example, A Dark Tinted Window.

Answer:

because is made of more than on type of atom

Answer: Changing the number of electrons will change the overall charge on an atom.

Explanation:

An atom that loses electrons will become positively charged and an atom with added electrons will become negatively charged. ... A charged atom is called an ion.

To determine the composition of the alloy in atom percent, we need to convert the weight percent of each element to atom percent using the atomic masses of copper and aluminum.

The atomic mass of copper (Cu) is 63.55 g/mol, and the atomic mass of aluminum (Al) is 26.98 g/mol.

First, let's calculate the mole fraction of copper (Cu) in the alloy:

Molar mass of Cu = 63.55 g/mol

Weight percent of Cu = 92%

Moles of Cu = (Weight of Cu / Molar mass of Cu)

= (92 g / 63.55 g/mol)

Next, let's calculate the mole fraction of aluminum (Al) in the alloy:

Molar mass of Al = 26.98 g/mol

Weight percent of Al = 8%

Moles of Al = (Weight of Al / Molar mass of Al)

= (8 g / 26.98 g/mol)

Now, we can calculate the total moles in the alloy:

Total moles = Moles of Cu + Moles of Al

Finally, we can calculate the atom percent of each element in the alloy:

Atom percent of Cu = (Moles of Cu / Total moles) x 100

Atom percent of Al = (Moles of Al / Total moles) x 100

Let's plug in the values and calculate:

Moles of Cu = (92 g / 63.55 g/mol)

= 1.448 moles

Moles of Al = (8 g / 26.98 g/mol)

= 0.297 moles

Total moles = 1.448 moles + 0.297 moles

= 1.745 moles

Atom percent of Cu = (1.448 moles / 1.745 moles) x 100

= 82.97%

Atom percent of Al = (0.297 moles / 1.745 moles) x 100

= 17.03%

Therefore, the composition of the alloy, in atom percent, is approximately 82.97% copper and 17.03% aluminum.

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Answer:

The answer is D

Explanation:

Answer:

Typical organic fertilizers include mineral sources, all animal waste including meat processing, manure, slurry, and guano, plant based fertilizers, such as compost, and biosolids.

The biome that is characterized by moderate temperatures and abundant precipitation is the Temperate Rainforest biome.

Temperate rainforests are located along coasts, which are typically surrounded by mountains, which keeps the moist air from escaping. These areas have moderate temperatures and high rainfall throughout the year. As a result, temperate rainforests are ideal for evergreen trees like Douglas fir, Sitka spruce, and western hemlock. These trees grow tall and straight, forming a dense canopy that blocks out most of the sunlight, resulting in a shaded understory.

The forest floor is covered with ferns, mosses, and small plants, providing a habitat for insects, snails, and small mammals. Temperate rainforests are mostly found in North America, South America, Europe, Asia, Australia, and New Zealand.

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The group 1 element; the alkali metals which are lithium, sodium and potassium have a pattern of reactivity such that they produce alkali when they dissolve in water.

The chemical equation is given below:

Na(s) + H2O(l) --- NaOH(aq) + H2(g)

K(s) + H2O(l) --- KOH(aq) + H2(g)

These are the metals which belong to the group 1 of the periodic table. They are called alkali metals because when they react with water, they produce soluble hydroxide known as alkali. For this reason, they are referred to as alkali metals.

So therefore, the group 1 element; the alkali metals which are lithium, sodium and potassium have a pattern of reactivity such that they produce alkali when they dissolve in water.

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Answer:

Engineering is all about solving problems using math, science, and technical knowledge. And engineers have solved a lot of problems in the world by designing and building various technologies. We have everything from machines that can breathe for you in hospitals to suspension bridges to computers we use every day. All of these things were once designed by engineers using the engineering design process.

Explanation:

Answer:

Students will have to use their brains to solve problems and challenges they will face to find a solution to cleaning up oil spills. Students will face failures after completing their solution, lots of research, and problems during the making of their solutions. What will work? What won't?

Explanation:

Hope this helps!

Answer:

116 km/h

Explanation:

We know that km/h means Kilometers an hour. And if this is constant, then he will travel 116 km/h.

A) The number of H₂O molecules in 0.23 moles is equal to 1.5 × 10²³.

B) The single displacement reaction is,

Ca + 2HCl →  CaCl₂ + H₂

C)  The double displacement reaction is,

Na₂SO₄ + 2NH₄Cl → 2NaCl  + (NH₄)₂SO₄

A displacement reaction is one in which a set of atoms in a molecule are replaced by another set of atoms.

When an element leaves its compound or when one element is replaced by another from its own compound, a single displacement reaction can be demonstrated as a type of redox reaction.

In aqueous solutions, double displacement reactions take place where ions precipitate and exchange ions.

Hydrogen gas and calcium chloride are produced in a single displacement reaction between calcium and HCl acid.

Ca + 2HCl →  CaCl₂ + H₂

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Answer: your answer is A

Explanation: the atoms has the same properties of the same element as the atomic number.

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Answer:chlorine’s is (Ne) 3s2 3p5

Explanation:lol

Answer: chlorine [Ne] 3s² 3p⁵ nitrogen 3s²2p³

Answer:

The extract is boiled with FeSO4 and acidified with concentrated H2SO4. The appearance on Prussian blue colour indicates the presence of nitrogen

Explanation:

PLS mark it brainliest

The answer is A. 4.82 x 10^24 molecules SO. Molecules can be found in all states of matter, including solids, liquids, gases, and plasmas.

What is Molecule?

The atoms can be of the same element, such as two oxygen atoms to form an oxygen molecule (O2), or they can be different elements, such as a hydrogen atom and an oxygen atom to form a water molecule (H2O).

To solve this problem, we need to use Avogadro's number, which is 6.022 x 10^23 molecules per mole.

First, we need to determine the number of molecules of sulfur monoxide in 1 mole of sulfur monoxide:

1 mole SO = 6.022 x 10^23 molecules SO

Next, we can use this conversion factor to find the number of molecules of sulfur monoxide in 8.00 moles of sulfur monoxide:

8.00 moles SO x 6.022 x 10^23 molecules SO/1 mole SO = 4.82 x 10^24 molecules SO

Therefore, the answer is A. 4.82 x 10^24 molecules SO.

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Answer:

0.162 mol

Explanation:

n=m/M

M= 20*3 + 15*2 + 8*4*2

M=154 g/mol

n=25g/154g/mol

n=0.162 mol

The number of moles in 25 grams of calcium phosphate is 0.162 mol.

Mole is a SI unit that is used to measure the quantity of any substance in a specific amount. To calculate the moles, we will divide the mass of the substance by the molar mass of that substance.

n = m/M

Calcium phosphate is a chemical compound that contains calcium and phosphorus or phosphoric acid, and it is used to treat the low calcium in the body and thyroid and parathyroid.

The molar mass of calcium sulfate is 154 g/mol

The mass of calcium sulfate is 25 grams

Putting the value in the equation

n = m/M

n = 25g / 154 g/mol = 0.162 mol

Thus, the moles of calcium sulfate are 0.162 mol.

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Answer:

6.14 atm

Explanation:

Initial temperature (T₁) = 100 °C

Initial pressure (P₁) = 4 atm

Final temperature (T₂) = 300 °C

Final pressure (P₂) =?

NOTE: Volume = constant (since the system is a closed system)

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 100 °C

Initial temperature (T₁) = 100 °C + 273 = 373 K

Final temperature (T₂) = 300 °C

Final temperature (T₂) = 300 °C + 273 = 573 K

Finally, we shall determine the pressure at the highest temperature as follow:

Initial temperature (T₁) = 373 K

Initial pressure (P₁) = 4 atm

Final temperature (T₂) = 573 K

Final pressure (P₂) =?

P₁ / T₁ = P₂ / T₂

4 / 373 = P₂ / 573

Cross multiply

373 × P₂ = 4 × 573

373 × P₂ = 2292

Divide both side by 373

P₂ = 2292 / 373

P₂ = 6.14 atm

Thus, the pressure at the highest temperature is 6.14 atm

Answer:

pH= 0.8

pOH=  13.2

Explanation:

Number of moles = mass/molar mass

mass= 15 g

molar mass =36.5 g/mol

Number of moles = 15 g/36.5 g/mol = 0.4 moles

From;

n= CV

Where;

C= concentration of solution

V= volume of solution

n= Number of moles

C = n/V

n= 0.4 moles

V= 2500mL or 2.5 L

C= 0.4/2.5

C= 0.16 M

Hence [H^+] = 0.16 M

pH= - log [H^+]

pH= 0.8

pOH= 14 - pH

pOH= 14 - 0.8

pOH=  13.2

The chemical's IUPAC names of the given compound are propanal and acetone.

IUPAC is the international union of practical and applied chemistry. It set rules for standard naming of the compound.

Propanal, or propanaldehyde, is an aldehyde that has one double bond and one oxygen atom.

Acetone is a kind of ketone. Ketones have the functional group R2CO.

Thus, chemical's IUPAC names of the given compound are propanal and acetone.

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Answer:

A. 2.71 V

Explanation:

The standard reduction potential, E° of the metals are as follows:

Mg²⁺ + 2e⁻ ⇌  Mg; E° = -2.372

Cu²⁺ + 2e⁻ ⇌  Cu; E° = +0.337

Since magnesium has the the lower E°, it will serve as the anode in the electrolytic cell while copper will serve as the cathode.

At the anode; Mg ⇌  Mg²⁺ + 2e⁻, E° = -2.372

At the cathode; Cu²⁺ + 2e⁻ ⇌  Cu, E° = +0.337

EMF of the cell = E° cathode - E° anode = 0.337 - (-2.372) = 2.71 V

Therefore, EMF of the cell is 2.71 V

Answer:-2.71 is the correct answer

Explanation:

A P E X

Explanation:

magnesium and sodium because they are minerals and part of iron

Answer:

The gases and dust particles thrown into the atmosphere during volcanic eruptions have influences on climate and cool the planet by shading incoming solar.

Explanation:

Hope This Helps

Have A great day

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Answer:

a . Shift it to the right toward the products.

Explanation:

In the reaction, if more of the reactant A is added to the system, the reaction will shift towards the products.

Answer: a . Shift it to the right toward the products.

Explanation:

The order of DECREASING electronegativity is Se > As > Sn. The order of DECREASING electronegativity is Ru > Hf > Xe. The order of DECREASING electronegativity is N >  Sb > He.

A functional group or an atom's propensity to draw electrons to itself is referred to as its "electronegativity," which is a chemical attribute. Both the atomic number and the separation between the valence electrons and the charged nuclei have an impact on an atom's electronegativity.

What causes an increase in electronegativity?

As you traverse a period in the periodic table from left to right, the electronegativity of atoms rises. The reason for this is that when you move from left to right across a period, the nuclear charge rises faster than the electron shielding, increasing the atoms' attraction to the valence electrons.

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Answer:

true

Explanation:

cause thereare both in liquid form

The total interaction energy in units of eV/atom assuming λ = 4156 eV and R_0/rho = 12 is 150N eV/atom.

Given Potential for two inert gas (Xe) atoms at separation R :

U=λe^(-R/rho)-R^6/a^6

a) To calculate the potential energy of the two atoms at equilibrium separation R_0,

we have to put dU/dR = 0λ e^(-R_0/rho) = (6R_0^6)/(a^6)λ e^(-R_0/rho) = (6(12rho)^6)/(a^6)

Therefore, λ = (6(12rho)^6)/(a^6) * e^(12)

The potential energy can be expressed as, U=λe^(-R_0/rho) = ((6(12rho)^6)/(a^6)) * e^(12) * e^(-12rho/rho)= ((6*12^6)/a^6) * e^(-11rho)

b) Given R_0 = 12rho, λ = (6(12rho)^6)/(a^6) * e^(12)

Therefore, λ = (6(12rho)^6)/(a^6) * e^(12) = (6 * 12^6)/(a^6) * e^(12) * e^(-12) = (6 * 12^6)/(a^6)

Potential energy U = λe^(-R_0/rho) = (6 * 12^6)/(a^6) * e^(-11rho)c)

The total interaction energy in units of eV/ atom assuming λ = 4156 eV and R_0/rho = 12

Therefore, λ = (6(12rho)^6)/(a^6) * e^(12) = (6 * 12^6)/(a^6) * e^(12) * e^(-12) = (6 * 12^6)/(a^6)

Total energy (U) = (N/2)U = (N/2)λe^(-R_0/rho) = (N/2)(6 * 12^6)/(a^6) * e^(-11rho) = 150N eV/atom.

Therefore, the total interaction energy in units of eV/atom assuming λ = 4156 eV and R_0/rho = 12 is 150N eV/atom.

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Answer:

n1 = 2, n2 = 4

1/wavelength = 1.097*10^7[1/2^2 — 1/4^2]

1/wavelength =0.20568*10^7

wavelength = 486.192*10^-9 Or

wavelength = 486.19 nm (blue color)

Explanation:

I just answered this in class