Which of these statements best describes the formula unit for a compound made from Mg and Cl?

It is MgCl2 because the total negative charge on Cl is one.
It is Mg2Cl because the total negative charge on Mg is one.
It is MgCl2 because the total positive charge on Mg is two.
It is Mg2Cl because the total positive charge on Mg is two.

WILL MARK BRAINLIEST

Answer:

6.5×10²⁴ atoms Fe

Explanation:

First find moles of iron:

5.4 mol Fe₂O₃ × (2 mol Fe / mol Fe₂O₃) = 10.8 mol Fe

Now calculate atoms of iron:

10.8 mol Fe × (6.02×10²³ atoms Fe / mol Fe) = 6.5×10²⁴ atoms Fe

Final answer:

Bromophenol blue changes from yellow to blue due to a chemical reaction happening when the pH of the solution is altered.

Explanation:

The color change from yellow to blue in bromophenol solutions is due to a chemical reaction. Bromophenol blue is an indicator that undergoes a color change depending on the pH of the solution it is in. In acidic conditions, the bromophenol solution appears yellow, while in basic conditions, it turns blue.

This color change occurs because the bromophenol blue molecule has different forms, or species, depending on the pH. In an acidic solution, the molecule is in its yellow form, which absorbs light in the visible spectrum and gives the solution its yellow color. In a basic solution, the molecule converts to its blue form, which also absorbs light in the visible spectrum but at a different wavelength, resulting in a blue color.

Energy is  released during the reaction and is captured by the energy-carrying molecule ATP (adenosine triphosphate).

Answer:

- the area has been below water in the past

Explanation:

The continents have been moving constantly for the last 2 billion years or so, so the face of the Earth has constantly been changing. What we see in the present as a landscape has been much different in the past, as new landmasses have risen out of the sea, while some have eroded or got molten. This has lead to a situation to have places like deserts, having fossils of marine animals in their sedimentary rocks. This simply tells us that what is now desert, in the past had much lower elevation, and it was covered with sea waters, thus the marine life was thriving. Throughout he geological process, over time, this area got lifted up, so it became part of the landmass, and developed into a desert because of the weather conditions.

Answer:

             Option-C (Both)

Explanation:

Chemical equation is the representation of a chemical reaction in the form of elemental symbols and molecular formulae.

Parts of Chemical equation are as follow:

a) Left Part:

                  The left part of the chemical equation shows the Reactants. Reactants are the starting material of a chemical equation which reacts together to form a final product(s).

In given equation Si₂H₃ and O₂ are the reactants.

b) Right Part:

                   The right part of the chemical equation shows the Products. Products are the substances formed due to the reaction of reactants.

In given equation SiO₂ and H₂O are the products.

c) Coefficient:

                    It is the number placed infront of a molecule or atom in a chemical equation. It specifies the number of molecules or atoms.

In given equation the number 4 infront of Si₂H₃ implies that there are 4 molecules of Si₂H₃.

d) Subscript:

                     It is the number placed after an atom in a molecule. It specifies the number of that particular atom in molecule.

In given equation the the number 2 after Si and number 3 after H implies that there are 2 atoms of Si and 3 atoms of H in one molecule of Si₂H₃ respectively.

Answer:

C. both

Explanation:

Answer:

36.0 mL

Explanation:

First, write the balanced reaction.

2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O

Calculate the moles of Ba(OH)₂:

0.500 mol/L × 0.0450 L = 0.0225 mol Ba(OH)₂

Use stoichiometry to find moles of HCl:

0.0225 mol Ba(OH)₂ × (2 mol HCl / mol Ba(OH)₂) = 0.0450 mol HCl

Now calculate the volume needed at the given concentration.

0.0450 mol HCl × (1 L / 1.25 mol) = 0.0360 L HCl

You need 36.0 mL of 1.25 M HCl.

The volume of 1.25M HCl acid required to react completely with 45.0ml of 0.500M [tex]Ba(OH)_{2}[/tex] is 36.0ml.

         [tex]2HCl +Ba(OH)_{2}- > BaCl_{2} +2H_{2} O[/tex]

        [tex]0.500mol/L*0.0450L=0.0225 mol[/tex]

               [tex]0.0225mol Ba(OH)_{2}*(2 mol HCl /mol Ba(OH)_{2})=0.0450mol HCl[/tex]

         [tex]0.0450mol HCl *(1L/1.25mol)=0.0360L HCl[/tex]

                                                       [tex]=36.0ml HCl[/tex]

Hence, the volume of 1.25M HCl is 36.0ml.

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Answer:

It is a network solid, a lattice of many covalent bonds (like diamond, except that it is black rather than transparent).

Explanation:

Answer:

Network Solid

Explanation:

Answer: D. Children who get a minimum of nine hours of sleep per night

achieve higher test scores than children who get fewer than nine

hours of sleep.

Children who get a minimum of nine hours of sleep per night achieve higher test scores than children who get fewer than nine hours of sleep. Hence, option D is correct.

A hypothesis is testable if there is a possibility of deciding whether it is true or false based on experimentation by anyone.

A direct way that sleep and school performance are connected is through effects on mental function.

Some known problems associated with lack of sleep include Decreased attention.

The ability to concentrate is vital to learning and academic achievement, but insufficient sleep reduces attention and focus.

According to the testable hypothesis, we can say that children who get a minimum of nine hours of sleep per night achieve higher test scores than children who get fewer than nine hours of sleep.

Hence, option D is correct.

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Answer:

Here's what I get  

Explanation:

There are several ways to read your equation.

2Mg + O₂ ⟶ 2MgO

Answer:

increased only 6 percent

Explanation:

The six pollutants regulated under the Clear Air Act increased only 6 percent between 1970 and 2001, while energy consumption increased 42 percent.

Answer:Explained

Explanation:

The six pollutants regulated under the clear air act are

Clear air act is the first and most comprehensive air quality control law and is under U.S. Environmental Protection agency.

A study of 2017 shows it causes a reduction of 10% in pollution within 3 years of implementation.

Answer:

Explanation:

The tables proportionate you physical properties, such as boiling points and solubilities of both sodium chloride and ammonium chloride.

Both substances are highly soluble in water, so they cannot be separated by adding water and filtering, because both will be dissolved.

The boiling point of sodium chloride is 1465°C while the boiling point of ammonium chloride is 520°C. That means that if you heat the mixture up to 520°C (a little bit higher may be) the ammonium chloride will become a gas while the sodium chloride will remain liquid. This way you will obtain all the sodium chloride from the mixture.

Adding  sodium hydroxide solution and filtering (option c.) and silver nitrate solution and filtering (option d) are not good methods to separate the sodium chloride as chemical reactions will change the sodium chloride into other substances.

Answer:

Igneous rocks form from the cooling and crystallization of magma.- A.

Final answer:

The true statement is that "igneous rocks form from the cooling and crystallization of magma". Options B, C, and D are incorrect; fossils are not common in metamorphic rocks, sedimentary rocks are also formed from sediments, and extrusive igneous rocks can weather.

Explanation:

The correct statement is A. Igneous rocks form from the cooling and crystallization of magma. Igneous rocks, such as granite and basalt, are formed from the solidification of magma or lava. Metamorphic rocks like schist are formed from pre-existing rocks that undergo transformation due to intense heat and pressure without melting. Contrary to option B, fossils are not frequently found in metamorphic rocks because the conditions that form metamorphic rocks typically destroy organic matter. Sedimentary rocks, mentioned in option C, are indeed a product of weathering, but they're primarily formed from the compaction and cementation of sediments, not chemical weathering alone. Lastly, option D is incorrect because extrusive igneous rocks, like all surface rocks, are subject to weathering processes.

Answer:

0.373M

Explanation:

Given parameters:

Mass of NaOH given = 112g

Volume of solvent = 0.75L

Solution:

1....To solve this problem, we first find the number of moles of the solute using the expression below:

Number of moles = mass/molar mass

Solving:

Molar mass of NaOH

Atomic mass of Na = 23g

Atomic mass of O = 16g

Atomic mass of H = 1g

Molar mass = 23 + 16 + 1 = 40g/mol

Number of moles = 112/40 = 2.8mol

2..... From the number of moles of solute, we then evaluate the molarity of the solution that would be produced using the expression below:

Molarity = number of moles/Volume

Molarity = 2.8/0.75 = 0.373M

Answer : The molarity of NaOH is, 3.733 mole/L

Explanation : Given,

Mass of NaOH = 112 g

Molar mass of NaOH = 40 g/mole

Volume of solution = 0.750 L

Molarity : It is defined as the number of moles of solute present in one liter of solution.

In this question, the solute is NaOH.

Formula used :

[tex]Molarity=\frac{w_b}{M_b\times V}[/tex]

where,

[tex]w_b[/tex] = mass of solute NaOH = 112 g

[tex]M_b[/tex] = molar mass of solute NaOH = 40 g/mole

V = volume of solution = 0.750 L

Now put all the given values in the above formula, we get the molarity of the solution.

[tex]Molarity=\frac{112g}{40g/mole\times 0.750L}=3.733mole/L[/tex]

Therefore, the molarity of NaOH is, 3.733 mole/L

Answer:

C. It blocked out sunlight

Explanation:

The asteroid impact 65 million years ago was devastating for lot of the animals and plants, resulting in a mass extinction, most noticeably of the dinosaurs. The impact itself killed a lot of flora and fauna, but it was the effect afterward that was crucial. From this impact, there was so much debris propelled into the atmosphere that the sunlight got blocked. Once this happened, most of the plants died out as they were not able to perform photosynthesis. Because the plants were dying out, the herbivores were left without food, so soon they followed, and because the herbivores died out, the predators died out to because they were left without food. The winners turned out to be the small and not specialized plants and animals.

Final answer:

The asteroid impact in the Yucatán Peninsula caused debris to C. block sunlight, disrupt photosynthesis, and lead to a steep drop in food availability and global temperatures, contributing significantly to the mass extinction of dinosaurs and altering the course of life on Earth.

Explanation:

The asteroid impact that occurred around 65 million years ago in the Yucatán Peninsula is associated with the extinction of dinosaurs. Following the collision, numerous environmental changes unfolded, which were detrimental to the dinosaurs and other species. One of the primary effects of the asteroid impact was the ejection of a vast amount of debris into the atmosphere. This debris included dust and particles that formed a thick cloud around the Earth, blocking sunlight and significantly reducing the amount of solar radiation reaching the surface of the planet.

With the blockage of sunlight, a catastrophic chain of events was set in motion. Photosynthesis, the process by which plants convert light energy into chemical energy, was severely disrupted. As a result, many plant species perished, leading to a dramatic decline in the food supply for herbivorous dinosaurs. Inevitable consequences ensued for the entire food chain, affecting both plant-eating and meat-eating dinosaurs.

Answer:

A. The tilt of Earth’s axis

Explanation:

The Earth's rotational axis is tilted about 23.5° relative to its orbital plane as it revolves around the Sun.

Thus, the angle of the sun in the sky varies over the year.

For example, if you lived at 45°N, the angle of the Sun in the sky would be 45°, and it would be the beginning of spring (see the diagram below).

The maximum angle of the Sun would be 68.5°.The Sun would be high overhead, and it would be the beginning of summer.

The minimum angle of the Sun would be 21.5°.The Sun would be low in the sky, and it would be the beginning of winter.

B. is wrong. The Earth is closer to the Sun during winter in the northern hemisphere.

C. is wrong. The position of the Moon affects sunlight on Earth only during a solar eclipse.

D is wrong. The speed at which the Earth rotates affects only the length of the day.

The main cause for the change in seasons is the tilt of Earth’s axis. This tilt, combined with Earth's orbit, makes sunlight hit different parts of Earth more directly at various times of the year, leading to temperature changes and thus, seasons.

The primary cause for the change in seasons is A. the tilt of Earth’s axis. This axial tilt, combined with Earth's orbit around the Sun, causes sunlight to hit different parts of the Earth more directly during different times of the year. Hence, leading to changes in temperature and ultimately, the change of seasons. It's important to note that it's not the distance of Earth from the Sun (option B), the position of the Moon between Earth and the Sun (option C), or the speed at which Earth rotates (option D) that primarily cause the seasonal changes.

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Answer:

Hardness in science refers to the resistance of a material to deformation, indentation, or penetration by means such as abrasion, drilling, impact, scratching, and/or wear, measured by hardness tests such as Brinell, Knoop, Rockwell, or Vickers.

Explanation:

The definition of hardness is the quality or condition of being hard. The cohesion of the particles on the surface of a mineral as determined by its capacity to scratch another or be itself scratched. the Resistance of metal to indentation under a static load or to scratching.

Answer:

Strength of chemical bonds

Explanation:

Answer:

[tex]\boxed{\text{D. 962 K}}[/tex]

Explanation:

The volume and number of moles are constant, so we can use Gay-Lussac’s Law:

At constant volume, the pressure exerted by a gas is directly proportional to its temperature.

[tex]\dfrac{p_{1}}{T_{1}} = \dfrac{p_{2}}{T_{2}}[/tex]

Data:

p₁ =    50 KPa; T₁ = 170 K

p₂ = 283 KPa; T₂ = ?

Calculations:

[tex]\begin{array}{rcl}\dfrac{50}{170} & = & \dfrac{283}{T_{2}}\\\\0.294 & = & \dfrac{283}{T_{2}}\\\\0.294T_{2} & = & 283\\\\T_{2} & = &\dfrac{283}{0.294}\\\\ & = &\textbf{962 K}\\\end{array}\\\text{The final temperature of the carbon dioxide is }\boxed{\textbf{962 K}}[/tex]

Bonds formed between atoms that have a difference in electronegativity lower than the ionic counterparts are polar covalent bonds. In H2S, the S atom is bonded to 2 H atoms.

Answer:

A. electronegativity < 1.0

Explanation:

Hydrogen --> electronegativity value is 2.1

Sulfur --> electronegativity value is 2.5

∆E, the electronegativity difference is 2.5 - 2.1 = 0.4

So, It is a non polar covalent bond present in [tex]H_2 S[/tex]

Examples :  

The electronegative values of H is 2.1

F is 4.0

O is 3.5  

N is 3.0

∆E value of HF Hydrogen bond  is

4.0 - 2.1 = 1.9

∆E value of H2O Hydrogen bond is

3.5 - 2.1 = 1.4

∆E value of NH3 Hydrogen bond is

3.0 - 2.1 = 0.9

∆E value between 0.5 to 1.7 is a polar covalent bond

∆E value btween 0 to 0.4 is a non polar covalent bond

∆E above 1.7 is an ionic bond

They form negative ions.

Metal is any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.

Metals are minerals like iron or lead that are found underground in rocks. These are separated from the rocks using heat. Metals are very useful materials.

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Answer:

Levels of oxygen would decrease and levels of carbon dioxide would increase. ( second choice)

Answer: Levels of oxygen would decrease and levels of carbon dioxide would increase.

Explanation:

The rate of photosynthesis will reduce on drastic reduction of the plants. The plants are the carbon sinks they absorb the carbon dioxide from the atmosphere in the absence of plants the carbon dioxide gas will raise in the atmosphere. The oxygen levels in the atmosphere will reduce as photosynthesis will not occur and the oxygen will not be produced as a byproduct of photosynthesis. Also the oxygen is the main requirement for the respiration of living beings except anaerobic bacteria. Thus the oxygen concentration will deplete in the atmosphere.

To solve the question you use the following formula:

concentration (1) × volume (1) = concentration (1) × volume (1)

3 M ×  volume (1)  = 1.8 M × 50 mL

volume (1)  = (1.8 M × 50 mL) / 3 M = 30 mL

Answer:

30.0 ml

Explanation:

1.8 M means 1.8 moles of HCl in 1 liter (or 1000 ml) of solution.

50 ml of solution has:

1.8 moles/(x moles) = 1000 ml/(50 ml)

x = 1.8 moles/(1000 ml) * 50 ml = 0.09 moles  

3 M means 3 moles of HCl in 1 liter of solution.

0.09 moles are found in:

3 moles/(0.09 moles) = 1000 ml/(x ml)

x = 0.09 moles * 1000 ml/(3 moles) = 30 ml

Then, you have to take a sample of 30 ml of a solution 3 M and add 20 ml of the solvent (probably water) to make 50 ml of solution 1.8 M of HCl.

Dont know how well educated you are on this topic, This is the right answer, But sorry if you dont understand it

NH3+H2O   |        NH4OH

____________________

N=1               |        N=1

H=3+2=5      |        H=4+1=5

O=1               |        O=1

Hope this helped you and good luck :)

Hit me up if you need anymore help :))))

Answer:

science is nothing without funding

Explanation:

Well Science in the US is highly a political affair. Scientists need funding for research, so they usually have to obtain grants from people who have the means to spare it. In many cases that means people who are involved with the government, or have close ties to it.

So scientists find themselves having to play off partisan politics in order to secure the funding they need for their research. Many times they also find that their research will inevitably get skewn to meet the original funders own ends.

Mostly what I have said is commonly known. However I am in school, and deal with scientists and doctoral researchers who have expressed and validated similar experiences.

The net ionic equation for the reaction of AgNO3(aq) and K2SO4(aq) can be found by considering the solubility rules. The net ionic equation is 2Ag+(aq) + SO4 2-(aq) → Ag2SO4(s), where Ag2SO4 is the precipitate.

The reaction between AgNO3(aq) and K2SO4(aq) involves ionic compounds in aqueous solutions, so we can use the solubility rules to determine the reactants and products. AgNO3(aq) and K2SO4(aq) both dissociate in water to give their individual ions. Next, we can predict the possible products of the reaction, which are Ag2SO4 and KNO3. However, referring to the solubility rules, Ag2SO4(s) is not soluble in water. Hence, a precipitate will form. Therefore, the net ionic equation is:
2Ag+(aq) + SO4 2-(aq) → Ag2SO4(s)

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The net ionic equation is 2Ag⁺(aq) + SO₄²⁻(aq) -> Ag₂SO₄()

The net ionic equation for the reaction of AgNO3(aq) with K2SO4(aq) can be determined by first writing the balanced molecular equation, followed by identifying the insoluble substance to write the net ionic equation. Here are the steps:

Therefore, the net ionic equation for the reaction of AgNO3(aq) with K2SO4(aq) is 2Ag+(aq) + SO42-(aq) -> Ag2SO4(s).

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Answer:

[tex]\boxed{\text{40 u}}[/tex]

Explanation:

The atomic mass is the weighted average of the atomic masses of each isotope.

In a weighted average, we multiply each value by a number representing its relative importance.

In this problem, the percent abundance represents the relative importance of each isotope.

Data:

K-39 = 23 %

K-40 = 48 %

Calculations:

(a) Calculate %  K-41

K-41 = 100 - 23 - 48 = 29 %

(b) Calculate atomic mass of sample

[tex]\begin{array}{cccc}\\\textbf{Isotope} & \textbf{Mass/u} & \textbf{Abundance} & \textbf{Contribution/u}\\\text{K-39} & 39.0 & 0.23 & 9.0\\\text{K-40} & 40.0 & 0.48 & 19.2\\\text{K-41} & 41.0 & 0.29 & 11.9\\ & \text{TOTAL} & = & 40.0\\\end{array}\\\text{The average atomic mass of the sample is }\boxed{\textbf{40 u}}[/tex]

Final answer:

The average mass of the sample can be calculated by considering the abundance of each isotope of potassium and their respective masses. The average mass of the sample is 100 grams.

Explanation:

The average mass of the sample can be calculated by considering the abundance of each isotope of potassium and their respective masses. Here's how:

Convert the percentages of each isotope to fractions by dividing them by 100.

Multiply each fraction by the atomic mass of the corresponding isotope.

Add up the products to get the average mass.

For example, if we have 100 grams of the sample:

23% of K-39 corresponds to 23 grams of K-39.

48% of K-40 corresponds to 48 grams of K-40.

The remaining 29% of K-41 corresponds to 29 grams of K-41.

Adding up the masses, we get: 23 + 48 + 29 = 100 grams. Therefore, the average mass of the sample is 100 grams.

Answer: The pressure inside the cylinder will be 1.5 atm. The pressure can be calculated using the Ideal Gas Equation which relates the pressure, volume, temperature, and amount of gas to each other.  

Further Explanation

The Ideal Gas Equation is:  

[tex]PV = nRT[/tex]

where:

P - pressure (in atm)

V - volume (in L)

n - amount of gas (in moles)

R - universal gas constant [tex]0.08206 \frac{L-atm}{mol-K}[/tex]

T - temperature (in K)

In the problem, we are given the values:

P = ?

V = 10.0 L (3 significant figures)

n = 0.60  moles  ( 2 significant figures)

T = 35.0 degrees Celsius (3 significant figures)

We need to convert the temperature to Kelvin before we can use the Ideal Gas Equation. The formula to convert from degree Celsius to Kelvin is:

[tex]Temperature \ in \ Kelvin = Temperature\ in \ Celsius \ + \ 273.15[/tex]

Therefore, for this problem,

[tex]Temperature\ in \ K = 35.0 +273.15\\Temperature\ in \ K = 308.15[/tex]

Solving for P using the Ideal Gas Equation:

[tex]P = \frac{nRT}{V} \\P = \frac{(0.60\ mol) \ (0.08206 \ \frac{L-atm}{mol - K}) \ (308.15\ K) \ }{10.0 \ L} \\P = 1.51\ atm[/tex]

The least number of significant figures is 2,  therefore, the final answer must have only 2 significant figures.

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Keywords: Ideal Gas Law, Gas Pressure

Answer:

2KHCO3+ H3PO4 arrow  K2HPO4 + 2 H20 + 2C02

Explanation:

2KHCO3+ H3PO4 arrow  K2HPO4 + 2 H20 + 2C02

Start with the Ks. Don't start on the right. Just balance the Ks on the left. The reason is that the CO3 is going to break down as well.

2KHCO3+ H3PO4 arrow  K2HPO4 +  H20 + C02

Leave the PO4 alone. Now look at the Hs that are on the right. There are 5 on the left. Leave the K2HPO4 alone. If you put a 2 in front of tthe H2O then you have a total of 5 Hs on the right.

2KHCO3+ H3PO4 arrow  K2HPO4 + 2H20 + C02

There are 2 carbons on the left. You need 2 on the right.

2KHCO3+ H3PO4 arrow  K2HPO4 + 2H20 + 2C02

That should do it.

Let's make a table to show balance.

Species      K              H          C         PO4-         O  

Left             2              5           2          1                6 from CO3^(2-)  

Right           2              5           2          1                6 from H2O/CO2

Answer:

[tex]\boxed{\math{6.02 \times 10^{23}} \text{ atoms of S }}[/tex]

Explanation:

1. Calculate the formula units of FeSO₄

There are 6.023 × 10²³ formula units in 1 mol of FeSO₄

[tex]\text{No. of formula units} = \text{1.00 mol FeSO}_{4} \times \dfrac{6.022\times 10^{23} \text{ units FeSO}_{4}}{\text{1 mol FeSO}_{4}}\\\\= 6.02\times 10^{23}\text{ formula units FeSO}_{4}[/tex]

2. Calculate the atoms of S

[tex]\text{No. of atoms} = 6.02 \times10^{23}\text {units FeSO}_{4} \times \dfrac{\text{1 atom S}}{\text{1 unit FeSO}_{4}}\\\\= \mathbf{6.02 \times 10^{23}} \textbf{ atoms S}\\\\\text{There are }\boxed{\mathbf{6.02 \times 10^{23}} \textbf{ atoms of S }} \text{ in 1.00 mol of FeSO}_{4}[/tex]

Answer:

602000000000000000000000

Explanation:

There are 602000000000000000000000 eggs present in one mole of eggs.

Answer:

6.02 x10^23 eggs

Explanation:

Since 1 mole is 6.02 x10^23, this would result in 6.02 x10^23 eggs.

Answer:

B.  R

Explanation:

A layer of partially weathered or unweathered rock is present in R soil horizon

Answer: Option (B)

Explanation: The R-layer represents the unweathered rocks that are located below the surface and is the lowest layer in the soil profile. Here, hard rocks are found which are difficult to break, and are breakable with heavy machineries only. This R-layer makes the foundation of the soil profile that supports the entire overlying series of layers.

Thus, the correct answer is option (B).