Balance the foll. equations

Answer:

Mass = 24.52 g

Explanation:

Given data:

Mass of sulfuric acid = ?

Number of moles of sulfuric acid = 0.25 mol

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of sulfuric acid is 98.07 g/mol

Now we will put the values in given formula.

0.25 mol = mass/ 98.07 g/mol

Mass = 24.52 g

Answer:

Direct evidence from rock samples and indirect evidence from seismic waves may account for why scientists have two ways of thinking about earth's layers

Explanation:

Scientists who study about the earth's structure and components called geologists have two main types of evidence to learn about Earth's interior namely

1. direct evidence from rock samples

2. indirect evidence from seismic waves

Direct evidence From Rock Samples

Scientists examine rocks from inside the Earth and these rocks give them clues about Earth’s structure. Some scientists have drilled holes as much as 12 kilometers into Earth and bring up samples of rock. From these samples, they can make inferences about conditions deep inside Earth, where these rocks formed. In addition, forces inside Earth sometimes blast rock to the surface from depths of more than 100 kilometers. These rocks from deep within the Earth provide more information about the interior.

Indirect evidence From Seismic Waves

Since scientist cannot look inside Earth, they have devised an indirect methods of observation by using seismic waves. When earthquakes occur, they produce seismic waves. Scientists record the seismic waves and study how they travel through Earth. The speed of seismic waves and the paths they take reveal the structure of the planet. Using data from seismic waves, scientists have learned that Earth’s interior is made up of several layers with each layer surrounding the layers beneath it.

Bases are the chemical opposite of acids. Acids are defined as compounds that donate a hydrogen ion (H+) to another compound.

Definition of Acids - An acid is any chemical compound which when dissolved in water gives a solution with a hydrogen ion activity greater than in pure water. Bronstead Lowry

Definition of Base - A base is an aqueous substance that can accept hydrogen ions. Bronstead Lowry Definition: A base is any substance which accepts a proton.

Physical Characteristics of Acids - Depending on the temperature, acids can occur in solid, liquid or gaseous form. Taste sour.

Physical Characteristics of Base - Bases feel slippery because of the reaction of the base with the oils of your hand. Frequently solids except ammonia which is a gas. Taste bitter.

Properties of Acids - Electrolytes, conduct electricity (because electrolytes), react with many metals.

Properties of Base - Electrolytes, conduct electricity, ranges from insoluble to so soluble that they can react with water vapor.

Acids are often used to remove rust from metals, as an electrolyte in batteries, for mineral processing, to produce fertilizers and gasoline and as additives in food and beverages. Bases are used primarily in cleaning as dishwashing and laundry detergents, oven cleaners and stain removers.

Here are some differences! Hope this helps, sorry I couldn't think of anything else. ;(

Answer:

Autumn is one of the four basic seasons of the year in the temperate climate zone. It is characterized by moderate air temperatures with a decreasing daily average, and relatively high annual precipitation. The climate autumn is the period of the year in which the average daily air temperature ranges around 10° C.

Astronomical fall begins at the fall equinox and lasts until the winter solstice, which roughly means in the southern hemisphere between March 23 and June 22 (sometimes these dates are a day earlier or a day later, and in a leap year they may be additionally retracted one day). During astronomical autumn, the day time of the day is shorter than the night time, and moreover, with each successive day of the day it decreases and night increases.

Answer:

1. Kelvin

Explanation:

The standard temperature for scientific report is the kelvin.

According to the SI unit definition, temperatures should reported in Kelvin.

Answer:

two moles noen

Answer:

According to your answers last quarter for number 1

Number 2  waxing gibbous

Explanation:

Answer:

iron ii is reddish in color and is known as the mineral hematite. iron iii is black and is the mineral wustite.

Explanation:

Answer:

1. Vaporization

2. Evaporation

3. Heat of vaporization

4. more

Explanation:

This problem deals with a phase change from liquid to gas. In such a change heat is added to cause the vaporization of the liquid to form gases.

Answer:

Hey again sissy how you doing?

Explanation:

Answer:

Atomic radius is directly proportional to Metallic reactivity in group 2.

Explanation:

Atomic radius is directly proportional to Metallic reactivity in group 2.

As we move down the group in group 2 which is called as the alkaline earth metals, the atomic number increases due to which the subshell increases. And the outermost shell's electron are less tightly held to the nucleus of the atom. Since the electrons are loosely held that means they can easily participate in reactions and that what makes it reactive down the 2nd group. Therefore alkaline earth metals with higher atomic number are more chemically reactive.

Yield of reaction = 80%

Reaction

Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)

mol Cu(NO₃)₂ :(MW 187,56 g/mol)

[tex]\tt \dfrac{469}{187.56}=2.5[/tex]

mol Na₂S :(MW 78,0452 g/mol)

[tex]\tt \dfrac{156}{78.0452}=2[/tex]

 Limiting reactant⇒Na₂S( 2 < 2.5)

mol of NaNO₃ (MW = 84,9947 g/mol)

[tex]\tt 2\times 2=4[/tex]

mass  NaNO₃ (theoretical)

[tex]\tt 4\times 84.9947=339.979~g[/tex]

[tex]\tt \dfrac{272}{339.979}=0.8\rightarrow=80\%[/tex]

the distance traveled and the time it took to travel that distance

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.67 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 9.418604...[/tex]

We have the final answer as

Hope this helps you

Answer:

Look at your periodic table

Explanation:

It tells you everything like Potasium 1 and 1 ox and 1 hydrogen

Answer:

silicon

Explanation:

Silicon. Silicon is often found in electronic devices, as well as the sand.

hope this helps UwU

The bird will accelerate with an acceleration of 1 m/s². Therefore, option (4) is correct.

Acceleration of a body can be explained as the change of velocity of a body with respect to time. The acceleration of a body is a vector parameter with both magnitude and direction. Acceleration can be defined as the 2nd derivative of position with respect to time.

According to Newton's 2nd law of motion, force is the product of the mass and acceleration of an object.

F = ma

And,   a = F/m

Therefore, the acceleration and mass of a body have an inverse relationship.

Given, the force acting on the bird, F =  2 N

Given the mass of the bird, m = 2Kg

The acceleration  in the speed of the bird can be calculated as:

a = F/m

a = 2N/2 Kg

a = 1 m/s²

Therefore, the bird accelerates at 1 m/s² because of the wind.

Learn more about acceleration, here:

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Answer:

An object has potential energy (stored energy) when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy (energy of motion).

Therefore, true. (Also would u mind giving brainliest, you don't have to hehe)

Answer:

Atom isotopes

Explanation:

The number of protons is equal to the number of electrons in elements therefore atom 2 has 6 protons like atom 1. This means that both are the same atom but with different masses which means they are isotopes.

The atoms are isotopes.

Isotopes are atoms having the same atomic number (i.e proton) but different mass number due to the difference in the neutron number of the atoms involved.

Mass number = 12

Proton = 6

Mass number = 14

Proton = Electron = 6 (for neutrao atom)

From the above, we can see that atom 1 and atom 2 have the same number of protons but different mass number.

Therefore, we can conclude that the atoms are isotopes

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Answer:

A Leaf

Explanation:

Compressions are the way that leaves are fossilized as the leaves are pressed firmly between hard layers of rock.

Answer:

Leaf

Explanation:

Because it is a plant

Salt and water level is balanced in our body by the proper regulation through hormonal actions. The level of sodium is controlled and the water if needed is reabsorbed from urine. And if the salt concentration is higher it  is removed through urine.

In addition to actively holding or releasing water in urine, the body manages its salt and water balance by excreting extra sodium in urine. This method has the benefit of reducing the need on external water sources for the long-term preservation of bodily fluids.

Researchers discovered that the kidney regulates levels of sodium, potassium, and the waste product urea to save or release water. This may be the link between salt consumption and glucocorticoid levels.

A high-salt meal raised glucocorticoid levels, which increased the amount of energy utilized by the liver and muscle to generate urea, which the kidney then used to conserve water.

The maintenance of the body fluids' normal concentration, or the sum of all dissolved chemicals  that would exert osmotic pressure against a barrier impervious to them, is known as osmotic control.

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Answer: hope this helps if so mark me brainlest

Explanation:

The four quantum numbers determine the state of the electron, and are

n

is the distance of the orbital from the nucleus (

1

,

2

,

3

,

4

etc),

l

is the shape of the orbital (

0

→

n

−

1

)

m

l

is the orientation of the orbital in space (

−

l

→

+

l

), and

m

s

is the spin of the electrons inside the orbital (

−

1

2

or

+

1

2

).

The electronic configuration for magnesium is

1

s

2

2

s

2

2

p

6

3

s

2

. The outermost electron is one in the

3

s

orbital, which means that

n

=

3

.

It also means that

l

=

0

, since

s

is basically shorthand for the orbital shape of

l

=

0

.

m

l

can range from

−

l

to

+

l

, but since

l

=

0

, then

m

l

must also be

0

.

Finally,

m

s

can be either one since there are two electrons in the

3

s

orbital and it doesn't really matter which spin you choose.

Putting all of these together, the final quantum numbers of a magnesium atom are

3

,

0

,

0

,

±

1

2

Answer:BC And D

Explanation:just did the quiz

The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen. Therefore, option B, C and D are correct.

The double-slit experiment, which was conducted to study the characteristics of light in the eighteenth century, has subsequently been found to illustrate the duality of photons as well as the ideas of superposition and quantum interference.

It implies that things we refer to as "particles," like electrons, in some ways mix the traits of both particles and waves. That is quantum physics' renowned wave-particle duality.

The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen.

Thus, option B, C and D are correct.

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Answer:

B

Explanation:

The reaction will occur naturally

Answer:

B. A pE x

Explanation:

Trust

Answer: I'm not sure but I'm making a guess cause that's what I put in mines

Explanation: I think just THINK it's "B.- Slightly Acidic"

Answer:

C

Explanation:

The airplanes speed would decrease