PLEASE HELP with these problems ASAP!!! 30 points!!

Answer:

a & b both are correct. But if you want only one answer, then it's 'a'

Answer:

n=3 the minimum n for which d orbital exist.

Answer:

In order to figure out how many molecules of water are present in that  

48.90-g

sample, you first need to determine how many moles of water you have there.

As you know, a mole is simply a very large collection of molecules. In order to have one mole of something, you need to have exactly  

6.022

⋅

10

23

molecules of that something - this is known as Avogadro's number.

In order to get to moles, you must use water's molar mass. A substance's molar mass tells you the mass of one mole of molecules of said substance.

Water has a molar mass of  

18.015 g/mol

. This means that one mole of water molecules has a mass of  

18.015 g

.

So, to sum this up,  

6.022

⋅

10

23

molecules of water will amount to  

1 mole

of water, which in turn will have a mass of  

18.015 g

.

Explanation:

Answer:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.

Answer:

1 kinetic and potential 3 reflective transparent

Answer:

A: plants give off water vapor as a waste product as they process energy

Explanation:

Evapotranspiration in plants is defined as the process whereby water is evaporated from its leaves through transpiration during the process of photosynthesis. Different factors like wind, humidity, temperature and availability of water could make it vary.

Comparing all the options, to this definition, the correct answer is Option A.

Answer:

λ   = 1×10²⁶m

Explanation:

Given data:

Wavelength of radiation =  ?

Frequency of radiation = 3×10⁻¹⁸Hz

Solution:

Formula:

c = f × λ

c = speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s =   3×10⁻¹⁸Hz  × λ

λ  =  3×10⁸ m/s /  3×10⁻¹⁸s⁻¹

λ   = 1×10²⁶m

Answer:

E) II and III.

Explanation:

Let's consider the complete ionic equation when solutions of acetic acid and sodium hydroxide react. It includes all the ions and molecular species.

CH₃COO⁻(aq) + H⁺(aq) + Na⁺(aq) + OH⁻(aq) ⇒ CH₃COO⁻(aq) + Na⁺(aq) + H₂O(l)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)

The species not present are:

II. acetate ion

III. sodium ion

Answer:

[tex]\lambda=314\times 10^{-2}\ m[/tex]

Explanation:

Given that,

Frequency, f = 95.5 MHz

We need to find the wavelength of a radio station emitting its signal.

The relation between the frequency and the wavelength is given by :

[tex]c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{95.5\times 10^6}\\\\=3.14\ m[/tex]

or

[tex]\lambda=314\times 10^{-2}\ m[/tex]

So, the wavelength of a radio station is [tex]314\times 10^{-2}\ m[/tex].

Explanation:

In this element, there are:

We find the element with atomic number 11, which is Sodium. (Na)

Answer: sodium

Explanation:

Answer:

C.

Explanation: In nuclear fission and fusion reactions, some of the energy in matter is converted to energy.  If you weigh the reactants and the products, the products will weigh less than the reactants.  This is called the mass defect and is the result of turning matter into energy.

Answer:

D.

Explanation:

With the Fat Boy and Little Boy nuclear bombs that were drop on Japan, They used a little gun (inside the bomb) that shot a little slug. this hit and caused a chain reaction that caused the bomb to detonate. This released much energy. Destroying much of the two cities when the bombs were dropped.

Answer:

1. acid produced by plants growing on rocks

plz give me BRAINLIEST answer

Answer:

The pH scale is often said to range from 0 to 14, and most solutions do fall within this range, although it's possible to get a pH below 0 or above 14. Anything below 7.0 is acidic, and anything above 7.0 is alkaline, or basic.

Explanation:

brainliest plsssssssss

The pH value that indicates a basic solution is if the pH of solution lies between 7 to 14 in the pH scale.

Basic solution is a solution whose pH is more than 7, indicating that it is alkaline or basic in nature. Basic solutions have a lower concentration of hydrogen ions [tex]\rm (H^+)[/tex] than pure water, which has a neutral pH of 7.0.

Basic solutions can be created by dissolving certain salts or bases in water, such as sodium hydroxide (NaOH) or potassium hydroxide (KOH).

Therefore, if the pH of a solution is more than 7 it is said to be basic in nature.

Learn more about basic solution here:

https://brainly.com/question/3449428

#SPJ6

Answer:

the answer is 10

Explanation:

Al2 is 2 atoms by itself

(SiO3)2 is 8 because Si is a single atom and O3 is 3 oxygen atoms but because of the subscript outside of the parentheses it doubles and becomes 2 and 6 respectively

Answer:

Explanation:

2. Our cells produce a lot of waste that must be eliminated (excreted) from the body. These residues are called excreta. The residues formed from the chemical reactions that take place inside the cells can be eliminated through:

• of the respiratory system (carbon dioxide)

• skin (sweat)

urinary system (urine)

Our cells expel these substances to maintain the dynamic balance (homeostasis) of our body and promote our well-being.

Answer:

there is no picture.

Explanation:

Answer:

1) digestion

2) hydroxide ion

3) neutralization

4) pH scale

5) hydrogen ion

6) chemical digestion

7) mechanical digestion

8) salt

Explanation:

I might be wrong though.

Answer:

1) digestion

2) hydroxide ion

3) neutralization

4) pH scale

5) hydrogen ion

6) chemical digestion

7) mechanical digestion

8) salt

Explanation: I just saw this ik its probably really late but i just decied

to give it a try

Answer:

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction

The density in lbs/in³ units : 0.697

Given

Density of gold is 19.3 g/cm³

Required

Conversion to  lbs/in³

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

Conversion factor

1 g =  0,00220462 lbs

1 cm³ = 0,0610237 in³

So the density :

[tex]\tt 19.3~\dfrac{g}{1~cm^3}\times \dfrac{cm^3}{0.0610237~in^3}\times \dfrac{0.00220462~lbs}{1~g}=0.697~lbs/in^3[/tex]

Answer: a

Explanation: the smoker actually exhales the sidestream smoke

Answer:

3.269 kg

Explanation:

1000g = 1 kg. Since kg is the larger unit, you need to divide by 1000 to get kilograms. You can do the problem as a unit conversion:

3269 g × 1 kg  =  3.269 kg

                1000g

Hope this is helpful!

Answer:

5

Explanation:

The number of valence electrons in the atom is 5 as can be seen from the ionization energy.

Ionization energy is the measure of the readiness of an atom to lose an electron. The lower the value the easier it is for an atom to lose an electron and vice versa.

Therefore, since we have 5 ionization energies given, the number of valence electrons in this atom is 5.

Answer:

Glaciers

Explanation:

Reservoirs refers to paces where water are stored. The largest water reservoir on earth are the oceans which contain about 97% of all the water on the earth.

The next highest  reservoir  are the glaciers or the polar ice caps. These hold quite an enormous amount of the water found on earth.

Surface and other fresh water only account for about 1.2% of all the surface water on earth.Ground water accounts for a very minute percentage of the water found on earth.

Answer:

I think it is a

Explanation:

Plasma is the fourth fundamental state of matter after solid, liquid and gas. At this stage of matter it exists in the form of a gas of ions and free electrons and is highly electrically conductive. Although plasma is abundant in the universe, natural occurrences are relatively rare here on Earth.

Answer:

21.44× 10² atoms

Explanation:

Number of chromium atoms = ?

Moles of potassium chromate = 3.56 × 10⁻²¹ mol

Solution:

1 mole of K₂CrO₄ contain 1 mole of Cr.

3.56 × 10⁻²¹ moles of K₂CrO₄ contain 3.56 × 10⁻²¹  moles of Cr.

Number of atoms of Cr:

1 mole contain 6.022× 10²³ atoms

3.56 × 10⁻²¹ mole ×  6.022× 10²³ atoms / 1mol

21.44× 10² atoms or 2144 atoms

P O₂ = 736.2 torr

Given

P tot=760 torr

P H₂O = 23.8 torr

Required

P gas/O₂

Solution

Dalton's law of partial pressures stated that

the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases  

Can be formulated:  

P tot = P1 + P2 + P3 ....  Pn

P tot = P H₂O + P O₂

760 torr = 23.8 torr + P O₂

P O₂ = 760 - 23.8

P O₂ = 736.2 torr

Answer:

Compound

Explanation:

Compounds – Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.

Example of compounds includes water (H2O), Hydrogen Peroxide (H2O2), etc. You could see water’s chemical formula, it says it has 2 atoms of Hydrogen combined with 1 atom of oxygen and in hydrogen peroxide, it has 2 atoms of hydrogen and two atoms of oxygen.

Answer:

[tex]Q_{vap}=7.90x10^5J[/tex]

Explanation:

Hello!

In this case, since this is the vaporization process of water, we need to keep in mind that the enthalpy of vaporization of this compound is 2.256 kJ/g, for 350 g, we obtain:

[tex]Q_{vap}=m*\Delta H_{vap}\\\\Q_{vap}=350g*2.256\frac{kJ}{g} *\frac{1000J}{1kJ} \\\\Q_{vap}=7.90x10^5J[/tex]

Because the process is carried out at 100 °C, the boiling temperature of water, already.

Best regards!

Answer:

323 m.

Explanation:

From the question given above, the following data were:

Frequency (f) = 930 KHz

Wavelength (λ) =?

Next, we shall convert 930 KHz to Hz. This can be obtained as follow:

1 KHz = 1000 Hz

Therefore,

930 KHz = 930 KHz × 1000 Hz / 1 KHz

930 KHz = 93×10⁴ Hz

Thus, 930 KHz is equivalent to 93×10⁴ Hz

Wavelength (λ) of a wave and the frequency (f) are related according to the equation:

Velocity = wavelength × frequency

v = λf

With the above formula, we can obtain the wavelength of radio wave as follow:

Frequency (f) = 93×10⁴ Hz

Velocity (v) of electromagnetic wave = 3×10⁸ m/s

Wavelength (λ) =?

v = λf

3×10⁸ = λ × 93×10⁴

Divide both side by 93×10⁴

λ = 3×10⁸ / 93×10⁴

λ = 323 m

Thus, the wavelength of the radio wave is 323 m

"Spherical: Bacteria shaped like a ball are called cocci, and a single bacterium is a coccus. Examples include the streptococcus group, responsible for “strep throat.”

Rod-shaped: These are known as bacilli (singular bacillus). ...

Spiral: These are known as spirilla (singular spirillus). " - Medical News Today