So
A scientist collected a 37.50 g sample of a
compound. Determine the % composition
of Cr in the compound if the sample is
made up of 19.01g O, Oxygen and 4.76 g
C, Carbon, and the remainder is Cr,
chromium. Type your answer to two
decimal places. Do not put the percent
sign.

The molarity of 2. 50 m NaCl solution is 2.68 molal and 48. 2 percent by mass KBr solution is 7.82 m.

Molality = moles solute / kg solvent  

Assume we have 1000 ml of solution.

1000 ml ₓ 1.08 g/ml = 1080 g

Now find the mass of NaCl:

2.50 M NaCl = 2.50 mol/L and 2.50 mol/L x 1 L = 2.50 moles of NaCl

molar mass NaCl = 58.4 g/mol, therefore mass NaCl present = 2.50 mol ₓ 58.5 g/mol = 146 g NaCl

Now find the mass of H₂O:

grams H₂O present = 1080 g - 146 g = 934 g H2O = 0.0.934 kg

We now have moles NaCl and kg H₂O

Molality  = 2.50 mol / 0.934kg = 2.68 molal

48.2% by mass of KBr means 48.2 g KBr / 100 g solution

To find molality, we need moles of KBr and kg of H₂O.  We can easily find he moles of KBr from the mass and the molar mass.

If we have 100 g solution, 48.2 g is KBr so the rest is H₂O.

100 g - 48.2 g = 51.8 g H₂O and this is equal to 0.0518 kg H₂O

Moles KBr = 48.2 g KBr ₓ 1 mol KBr/119 g = 0.405 moles KBr

Molality = 0.405 moles KBr / 0.0518 kg H₂O = 7.82 m

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Answer:

Physical geography is one of the two fields of geography. Physical geography is the branch of natural science which deals with the processes and patterns in the natural environment such as the atmosphere

Answer:

the last one

explanation is the white colour

Answer:

For the second to last problem the coefficients is  1, 5, 3, and 4 and the last problem all the coefficients are 1's

Explanation:

For the second to last problem you put 3 next to CO₂ so C is 3 on both sides. Then you put 4 next to H₂O because H will then be 8 on both sides. Lastly you put 5 next to O₂ which will make 10 on the reactant side. On the product side the 3 next to CO₂ will make O on the product side 6 and the 4 next to H₂O will make O on the product side 4. You will then add both together and it will make 10, which will make 10 on both sides. Hope this helps!

The gas will have a volume of 25.0 mL at a pressures of 60 kPa or a temperature of 200 K.

The average kinetic potential of the particle in a system is measured by temperature. Temperature is measured using thermometers, which measure the temperature of a system by taking a reading of the system's average kinetic energy. Temperature is measured in degrees, with higher temperatures indicating a higher average kinetic energy. Temperature can be affected by a variety of factors, including the amount of energy added to or removed from a system, the number of particles present in the system, and the type of particles present in the system.

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Answer: Heat is not a form of energy

sound is a form of energy

Explanation:

Answer:

Nonmetals tend to gain electrons while metals tend to lose electrons.

Explanation:

The statement that describes the reaction of nonmetals and metals is "Nonmetals tend to gain electrons while metals tend to lose electrons."

Metals (such as copper and aluminum) are good heat and thermal conductors, whereas nonmetals (such as phosphorus and sulphur) are considered to be insulators.

When a metal reacts with a nonmetal, the metal loses electrons while the nonmetal gains electrons. In order to achieve their nearest noble gas configuration, elements can gain or lose electrons. The formation of ions for the octet's completion aids in their stability. Metals lose electrons to complete their octet in a reaction between metals and nonmetals, while nonmetals acquire electrons to complete their octet.

When metal atoms produce ions, they lose electrons from their outer shell; the ions are positive because they contain more protons than electrons. The ions that are generated have complete outer shells. The ions have a full outer shell and have the electrical structure of a noble gas (group zero element).

Nonmetals are found further to the right on the periodic table and have high ionization energy and electron affinities, making them comparatively easy to absorb electrons and difficult to lose them. They also have a higher number of valence electrons, and are on the verge of completing an octet of eight electrons.

Hence the correct answer is nonmetals tend to gain electrons while metals tend to lose electrons.

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Answer:

it opposes motion. the object would continue to slide forever if not stopped by another object.

Answer:

Plants are called autotrophs because they can use energy from light to synthesize, or make, their own food source. Many people believe they are “feeding” a plant when they put it in soil, water it, or place it outside in the Sun, but none of these things are considered food. Rather, plants use sunlight, water, and the gases in the air to make glucose, which is a form of sugar that plants need to survive. This process is called photosynthesis and is performed by all plants, algae, and even some microorganisms. To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight.

Answer:

energy is of course required for photosynthesis to occur as photosynthesis is self is the process of plants of green plants to make food or to provide food for themselves in the presence of sunlight carbon dioxide and using water from the soil in the definition you can also say that sunlight is needed for photosynthesis to take place and some light is a form of energy which is solar energy so energy is required for photosynthesis to occur

Hey,

Answer:

AgCl (Silver Chloride)

Explanation:

sodium chloride + silver nitrate → sodium nitrate+ silver chloride

Hope it helps :)

Have a great day!

Answer: The molecular formula of the molecule is [tex]CH_3OH[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

The given compound contains one carbon atom, four hydrogen atoms and one oxygen atom.

It is an alcohol with functional group -OH and with molecular formula of [tex]CH_3OH[/tex] named as methanol.

The molecular formula of the molecule is [tex]CH_3OH[/tex]

The molecular formula of the molecule in figure 3 is [tex]CH_3OH[/tex].

The following information should be considered:

Therefore we can conclude that the molecular formula of the molecule in figure 3 is [tex]CH_3OH[/tex].

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Answer: There are five significant figures in 865,010.

Explanation:

When a degree of accuracy is stated by each digit present in a mathematical figure then it is called a significant figure.

Rules for counting significant figures is as follows.

So, in the given figure 865010 has five significant figures and the trailing zero will not be counted.

Thus, we can conclude that there are five significant figures in 865,010.

Answer:

1, 3, 2

Explanation:

1 mole of N^2 so you have 2 N.

3 mole of H^2 so you have 6 H.

2 mole NH^3 so you have 2 N and 6 H

2N + 6H = 2N + 6H

Answer:

5 mol NaOH = 5 mol NaClO

Plantear y balancear reacción: NaOH + HClO ⇒ NaClO + H2O

Como se puede apreciar, los coeficientes estequiométricos son uno por lo tanto, la cantidad de NaClO que se genera será igual a la cantidad de moles que reaccionan de NaOH

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option C.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

The statement "atoms have a small, dense nucleus" is true.  A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.

Therefore, the correct option is option C.

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Answer:Acceleration has to do with changing how fast an object is moving If an object is not changing its velocity, then the object is not accelerating.  Anytime an object's velocity is changing, the object is said to be accelerating it has an acceleration.

Explanation:

Answer:

Magnetic separation

Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.

Explanation:

Separation techniques makes use of the differences in the properties of components of mixtures to separate theses components, one from another.

In a moxturemof iron shavings and sawdust, a suitable separation technique would be the use of magnetic separation.

The use of this separation technique is abasednonnthe principle that when a magnetnis brought near to a mixture containing magnetic and non-magnetic materials, the magnetic materials will be separated from the non-magnetic materials due to their attraction to the magnet. Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.

Answer:

It is a sour candy. And when you put it in water it will dissolves.  

Explanation:

Answer:

1) 0.98 atm

2) 74.58 cmHg

3) 14.47 lbs./in²

4) 745.8 torrs

Explanation:

We are given the atmospheric pressure as 745.8 mmHg

1) Converting mmHg to atmospheres(atm), we divide the pressure by 760.

P = 745.8/760

P = 0.98 atm

2) Converting mmHg to cmHg, we multiply the pressure by 0.1;

P = 745.8 × 0.1

P = 74.58 cmHg

3) Converting mmHg to lbs./in², we divide the pressure by 51.75;

P = 748.5/51.715

P = 14.47 lbs./in²

4) Converting mmHg to torrs, we multiply the pressure by 1;

P = 745.8 × 1

P = 745.8 torrs

Answer: 2KCIO3–> 3O2+ 2KCI

Explanation:

Explanation:

2KCLO3=3O2+2KC

hope this helps

Answer:

Earnings based on how much they sell

Explanation:

A sales presentation can be defined as series of talk given by a salesperson with the attempt to persuade someone or a potential customer to buy a particular product, by giving information it. Some salespersons resort to the use of dramatics so as to initiate and close the sale of a particular product by engaging in series of theatrical actions.

In sales and marketing, the term closing with respect to a sales can be defined as the process of making a business sale successful such as through the exchange of money for a particular product or goods.

For a salesperson to be able to close a sales, he or she require abilities such as courage, negotiation skills, listening ears and interpersonal skills to do so or achieve a successful sales. After a successful sales, they're entitled to a percentage of the amount made from selling a particular product or closing a deal based on what is stated in the contract. These amount of money earned with respect to each sales is generally referred to as commissions.

Commission can be defined as an amount of money earned based on how much a salesperson sell.

Answer:

There are several methods that can be used to prevent or slow corrosion:

Coatings: Applying a protective coating to a metal surface can prevent corrosion by creating a barrier between the metal and the environment. Common types of coatings include paint, galvanizing, and electroplating.

Cathodic protection: Cathodic protection involves applying a current to a metal surface in order to reduce the potential difference between the metal and its environment. This can help to prevent corrosion by reducing the electron flow that drives the corrosion reaction.

Inhibitors: Corrosion inhibitors are chemical substances that can be applied to a metal surface to slow or prevent corrosion. These substances work by reacting with the metal surface or the environment to form a protective film or layer.

Passivation: Passivation is a process that involves removing surface contaminants and oxide layers from a metal surface in order to improve its corrosion resistance. This can be achieved through chemical or mechanical means.

Materials selection: Choosing corrosion-resistant materials for specific applications can help to prevent or slow corrosion. For example, stainless steel is a commonly used material for corrosive environments because of its high resistance to corrosion.

Environmental control: Controlling the environment in which a metal object is used can also help to prevent or slow corrosion. For example, reducing humidity or keeping a metal object dry can help to prevent corrosion.

Maintenance: Regular maintenance, such as cleaning and inspection, can help to identify and address corrosion issues before they become severe. This can include removing corrosion products, repairing damage, and applying protective coatings as needed.

Explanation:

14) We need to find the # of moles of NaOH in 3.5 L solution. Note: 1 M = 1 mol/Ll

(3.00 mol NaOH/1 L)(3.5 L) = 10.5 mol NaOH

Next we need find the volume of 19.4M NaOH solution that contains 10.5 mol NaOH:

(10.5 mol NaOH)×(1 L NaOH/19.4 mol NaOH)

= 0.541 L NaOH

This means that 0.541 L (541 mL) of 19.4M NaOH solution must be diluted to 3.5 L in order to get 3.00M NaOH solution.

15) 425 mL (0.425 L) of 0.105M HCl solution contains

(0.105 mol HCl/1 L)×(0.425 L) = 0.0446 mol HCl

so when enough water is added to 1L, the molarity becomes

0.0446 mol HCl/1 L = 0.0446M HCl

16) CaBr2 ---> Ca^+2 + 2Br^-1

For every Ca^+2 ion in the solution, you have 2 Br^-1 ions

If the concentration of CaBr2 is 6 mol/L (or 6M),.then the concentration of Br^-1 irons is

[Br^-1] = 2×[Ca^+2] = 2×(6 mol/L) = 12 mol Br^-1/L

17) The reason you won't need 1.0 L of water is that part of the volume of the solution is taken up by the NaOH so you will always need slightly less than 1 L.

Sodium does not form a stable ion with the same electronic configuration as neon.

Electronic configuration of an element describes that how the electrons are distributed in its atomic orbitals. Electronic configuration of an atoms follows a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

Sodium (Na) ion has the same electronic configuration as that of neon. Both are the isoelectronic species with 10 electrons and the electronic configuration is 1s22s22p6.

Sodium has electronic configuration is 1s22s22p63s1. It loses one electron  to give Na+ ion with the electronic configuration of neon (Ne).

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To find a proton number, we can use the Periodic Table of the Elements.

The Periodic Table of the Elements is a table that organizes all discovered chemical elements in rows and columns according to the increasing atomic number.

To find the numbers of protons using this periodic table, first, we have to find the element on the periodic table. Using the columns (group) or rows (period) can make the element easier to find on the table.

Second, find the element’s atomic number, which is located above the element symbol, in the upper left-hand corner of the square. This atomic number will tell us how many protons make up a single atom of that element. For example, Boron (B) has an atomic number of 5, consequently it has 5 protons.

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Laboratories are used in many different fields, including medicine, chemistry, biology, physics, engineering, and more.

A laboratory is a facility where scientists conduct research and experiments. It is equipped with specialized equipment, tools, and supplies required for the specific purpose of conducting scientific tests, experiments, and analysis.

The next step would be to look for other seminal components, such as white blood cells, red blood cells, epithelial cells, and other organic and inorganic components. If no sperm are present, then a detailed analysis of the sample is necessary to determine the cause of the absence of sperm. Possible causes of azoospermia, or the absence of sperm, include hormonal imbalance, anatomical defects, genetic conditions, and medical treatments.

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