4. Given the balanced equation: 2Na + S → Na₂S

How many grams of sulfur are needed to react with 43 grams of Na? Round to the nearest whole number.

a. 119 g
b. 158 g
c. 32 g
d. 30 g

Answer:

2.77 atm

Explanation:

The total pressure of a mixture of gases is calculated as the addition of the partial pressures of the gases. In this case, the total pressure (Pt) is calculated from the partial pressures of helium (PHe), nitrogen (PN₂) and neon (PNe):

Pt = PHe + PN₂ + PNe

First, we have to convert the partial pressures to the same unit (atm). For this, we have to know that 1 atm=760 mmHg=760 Torr

PHe = 585 mmHg x 1 atm/760 mmHg = 0.77 atm

PN₂= 0.76 atm

PNe= 940 Torr x 1 atm/760 Torr = 1.24 atm

Finally, we calculate the total pressure in atm:

Pt = 0.77 atm + 0.76 atm + 1.24 atm= 2.77 atm

Answer:

An Arrhenius acid is a substance that associates in water to form hydrogen irons (H+) In other words an acid increases the concentration of H+ ions in an aqueous solution

Answer:

Strong acids are strong electrolytes. Such acids ionize completely.

Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.

Explanation:

Electrolytes are the substances that produce ions when they are dissolved in water. Electrolytes can be categorized as bases, acids, and salts.

Strong acids are strong electrolytes. Such acids ionize completely.

Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.

Explanation:

Chemical fertilizers raise crop yields, but their heavy usage has hardened the soil, diminished fertility, reinforced pesticides, contaminated air and water, and emitted greenhouse gases, posing health and environmental risks.

It's the eye because it's the organ of sight

Answer:

70 g NaCl at 20 °C Supersaturated.

Answer: The pH of a 0.00250 M oxycodone solution is 9.96

Explanation:

[tex]C_{18}H_{21}NO_4\rightarrow C_{18}H_{20}NO_3^++OH^-[/tex]

 cM                     0  M         0 M

[tex]c-c\alpha[/tex]        [tex]c\alpha[/tex]         [tex]c\times \alpha[/tex]

So dissociation constant will be:

[tex]K_b=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]

Give c= 0.00250 M and [tex]pK_b[/tex] = 5.47

[tex]pK_b=-log(K_b)[/tex]

[tex]K_b=3.38\times 10^{-6}[/tex]

Putting in the values we get:

[tex]3.38\times 10^{-6}=\frac{(0.00250\times \alpha)^2}{(0.00250-0.00250\times \alpha)}[/tex]

[tex](\alpha)=0.036[/tex]

[tex][OH^-]=c\times \alpha[/tex]

[tex][OH^-]=0.00250\times 0.0369=9\times 10^{-5}[/tex]

Also [tex]pOH=-log[OH^-][/tex]

[tex]pOH=-log[9\times 10^{-5}]=4.04[/tex]

[tex]pH+pOH=14[/tex]

[tex]pH=14-404=9.96[/tex]

Thus pH of a 0.00250 M oxycodone solution is 9.96

Answer:

12hrs

Explanation:

Hope this helps

Answer:

12 hours

Explanation:

it's half of the time in a day now

Answer:

1.Hydrogen peroxide,2.Potassium nitrate,3.Ethane,4.Ammonium phosphate,5.Aluminium sulfate,6.Barium hydroxide,7.Calcium phosphate,8.Calcium chloride,9.Copper nitrite,10.Iron oxide,11.Sulfuric acid,12.Phosphoric acid,13.Mercury chloride,14.Potassium sulfite,15.Potassium manganate,16.Magnesium acetate,17.Magnesium nitrate,18.Sodium chloride,19.Sodium acetate,20.Ammonium bromide

heat is transferred from your hand to the ice cube

Answer:

Heat is transferred from your hand to the ice cube.

Answer:

okay you need to find the synnomy

Answer:

The water can become acidified than normal because all the pollution such as when carbon dioxide can dissolve in sea waters causing the water be polluted because of the bad air.

Explanation:

Answer:

the highest frequency

Explanation:

Answer:

true

Explanation:

Answer:

b. trueeeeeeeeeeeeeeeeeeeeeeeeeeee

Answer:

chlorate changes to chlorous acid

Answer:

personally I think it's a but it could also be D.

But yeah personally I would say A

Answer:

They would be pushed out and lose their homes

Explanation:

A wildfire destroys most of the plant life in a forest. Animals would be pushed out and lose their homes.

An unplanned, uncontrolled, and unpredictable fire inside an area of flammable vegetation is known by several names, including wildfire, bushfire, bushfire, wildland fire, and rural fire. A wildfire may be more precisely referred to by the terms bushfire, desert fire, forest fire, hill fire, peatland fire, prairie fire, vegetable fire, or veld fire, depending on the kind of vegetation that is present.

Wildfires are separate from controlled and prescribed burning, which is a good human use of wildland fire, even though controlled burns have the potential to turn into wildfires. Wildfires likely started shortly after terrestrial plants first appeared, which occurred in the Silurian epoch 419 million years ago, according to fossil charcoal. A wildfire destroys most of the plant life in a forest. Animals would be pushed out and lose their homes.

Therefore, animals would be pushed out and lose their homes.

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Answer:

The law of floatation is applied in all vessels which travel by waterways that include ships, submarines and ferry boats. It is also applied in some vessels which travel by air ways such as hot air balloon and air ship. Balloons of different colors and shapes are filled with lighter gas so that will float in air.

Answer:

*hot air balloon

*swimming

Explanation:

sna makatulong po:)

Answer:

Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.

Answer:

44.4%

Explanation:

The balanced chemical equation for the reaction is:

2 H₂(g) + O₂(g) → 2 H₂O(g)

According to the equation, 1 mol of O₂ produces 2 moles of water (H₂O). We convert the moles to grams by using the molecular weight (Mw) of each compound:

Mw(O₂) = 2 x 16 g/mol O = 32 g/mol

mass O₂ = 1 mol x 32 g/mol = 32 g O₂

Mw(H₂O) = (2 x 1 g/mol H) + 16 g/mol O = 18 g/mol

mass H₂O = 2 mol x 18 g/mol = 36 g H₂O

Thus, from 32 grams of O₂, 36 g of H₂O are produced (stoichiometric ratio= 36 g H₂O/32 g O₂). We calculate the amount of H₂O that would be produced from 20 grams of O₂ by multiplying the stoichiometric ratio by the mass of O₂, as follows:

36 g H₂O/32 g O₂ x 20 g O₂ = 22.5 g H₂O

The theoretical yield of H₂O is 22.5 g, and the actual amount produced is 10 g. So, we calculate the percent yield as follows:

Percent yield = actual yield/ theoretical yield x 100

                      = (10 g)/(22.5 g) x 100

                      = 44.4%

Answer:

See explanation

Explanation:

Oxygen has six electrons in its outermost shell. This means that its octet can be completed when it shares two electrons with another oxygen atom.

In a covalent bond, each bonding atom contributes one electron to the bond. This means that four electrons are shared between two oxygen atoms. Each atom contributes a total of two electrons which are shared. This molecule of oxygen satisfies the octet rule rather than a single atom of oxygen.

An image of the oxygen molecule is attached to this answer.

This system of two oxygen atoms joined together in a covalent bond is called an oxygen molecule(O2).

The elements of period 2 that satisfy the descriptions are;

a) Neon

b) carbon

c) sodium

c) sodium

We know that the periodic table is an arrangement of the elements in the order of their reactivity. We know that the elements that we have are arranged into groups and periods.

The elements that are in the same group do have similar chemical properties while the elements that are in the same period do have the same number of shells. The properties of the elements in a periods tends to change across the period.

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Answer:

Running water makes rock edges very dull because of erosion.

Explanation:

hope this helps  ^_^

Answer:

Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.

Explanation:

We study the various atomic models in our course of study because, it is important for us to know, how did people come to the present concept of an atom. How did physics evolve from classical to quantum physics.

All these are important for us to know and thus, knowledge about various atomic models, their discoveries and drawbacks and finally improvements based on scientific evidence present at that time is important for us to understand the underlying theory very well.

Explanation:

A DAY IN THE LIFE OF METIS JOURNAL. I WROTE IT HOPE U LIKE IT XD

We, who live in the west, were Nomadic. So we always moved from place to place to hunt buffalo and other fur-bearing animals. And now again we have to shift everything we collected , like, all the essential needs we collected. It’s really hard to shift stuff, But when you move to a new place you get to see new beautiful places. They are just so satisfying to see! It’s like all my work(like the shifting work) is paid off. I love it! We always meet the Hudson’s bay company employees, and give them furs which we took from the bissons and other furry animals we hunted. And in exchange they give us their (Hudson’s Bay company) goods. Which is good! Because then we or I won't be able to enjoy that delicious pemmican!

 The one reason that makes me proud of my parents is that because of them I am like a translator for both sides in the fur trade! Anyways coming back to the present. As I said before, we were moving today to another place, But on the way some people along with my father will ride the famous York boats carrying supplies to fur posts. I begged my father to take me with him! And as usual he gave me some silly reason for me to stay. And now since I don’t have anything to do I will-..Nevermind, My mom’s calling me. Okay after helping my mom keep the fur posts into the York boats me , my mom, and the others are just relaxing and enjoying nature just to take a break. Since, I am so obsessed with my Journal notebook today I’m just going to sit here and right what comes to my mind. I’m not like the others who always seem to be talking with someone. I like my own space! 

I kind of miss my dad already, but he and his fellow members need to travel the waterways from the red river further west and north to hudson bay. These red river carts also travel the trek back and forth over land to St. Paul, Minnesota and to posts in saskatchewan.  Speaking about the red river, the only large settlement in the region is the red colony. About 12000 people lived in this colony around Fort Garry. Some were the original Selkirk settlers or their descendents. They had come from Scotland with lord Selkirk when he established the colony in 1811. Many of these original settlers were poor farmers who had been displaced  from their lands in scotland. They had endured many hardships in the early years of settlement, including foods, hunger, and sickness. I love studying about other colonies, cultures , history etc.

Answer:

3.0x10¹⁹ atoms

Explanation:

First we convert 10 mg of mercury into grams:

Then we convert 0.01 g of mercury into moles, using its molar mass:

Then we convert moles into number of atoms, using Avogadro's number:

Answer:

In all living organisms, in substances like carbohydrate, starch, urea etc. To prove sugar contains carbon, take a little amount of sugar in spoon and heat it gently till it melts and turned into yellowish color. On further heating it changes into brown colored mass and then black, which is charcoal.

Take a small bit of sugar on a spoon and slowly heat it until it melts and turns a yellowish tint to demonstrate that it contains carbon. As it continues to heat up, it transforms into charcoal, which is a black mass first.

Strongly heating wood with little oxygen produces charcoal, a light black carbon residue that has been stripped of all water and volatile components.

Since the beginning of time, charcoal has been used for a wide variety of reasons, including art and healing, but its most significant usage has been as a metallurgical fuel. The typical fuel for a blacksmith's forge and other uses requiring high heat is charcoal.

Sugar breaks down into carbon and water when it is heated. Water is still a chemical, but it can't be heated

Thus,  As it continues to heat up, it transforms into charcoal, which is a black mass first.

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Answer:

No, I don't think so at least

Explanation:

In chemistry, you do calculations to find the concentration of a solution with another solution of KNOWN concentration. Without concentrations of either solution, were would you get values from? Where would you start? :3

You can not titrate  a solution of unknown concentration with another solution of unknown concentration and still get a meaningful answer.

Titration involves the standardization of unknown solution using a standard solution. By this definition, titration must involve a standard solution.

Since the two unknown solutions are not standardized, we can never get a meaningful answer because we can not be able to perform any calculation unless we have a standard solution.

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