A 54.8 g sample of quartz, which has a specific heat capacity of 0.730 J-g¹C¹, is put into a calorimeter (see sketch at right)
that contains 200.0 g of water. The temperature of the water starts off at 23.0 °C. When the temperature of the water stops
changing it's 26.4 °C. The pressure remains constant at 1 atm.
Calculate the initial temperature of the quartz sample. Be sure your answer is rounded to 2 significant digits.

\(\\ \rm\longmapsto Distance=Speed(Time)\)

\(\\ \rm\longmapsto Distance=25(2700)\)

\(\\ \rm\longmapsto Distance=67500m\)

The object travelling at 25 m/s, will travel a distance of 67500 m in 45 mins.

1 min = 60 s

Therefore,

45 mins = 45 × 60

Time = 2700

Speed = 25 m/s

Distance = speed × time

Distance = 25 × 2700

Therefore, the object will cover a distance of 67500 m in 2700 s (i.e 45 mins)

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Maladaptive  or dangerous use of a chemical substance is referred to as Drug Abuse.

Misusing or using a dangerous chemical substance in a harmful way is often called substance abuse or substance misuse. Substance abuse means using drugs or alcohol too much and in a bad way.

This can harm your body, mind, relationships, and how you function in general. If you or someone you know is having trouble with drugs or alcohol, it's  really important to ask for help. There are many different ways to get help and support for this problem.

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a) The molar mass of Co is 58.93 g/mol, which means that 1 mole of Co contains 6.022 x \(10^{23}\)  atoms.

Therefore, 1 mol Co has 6.022 x \(10^{23}\) atoms.

b) To find the number of atoms in 0.0052 mol Co, we can use the same conversion factor as in part (a):

0.0052 mol Co x 6.022 x \(10^{23}\)  atoms/mol = 3.129 x \(10^{21}\) atoms

c) First, we need to convert the mass of Co to moles:

17.8 g Co ÷ 58.93 g/mol = 0.302 mol Co

Then, we can use the conversion factor from part (a):

0.302 mol Co x 6.022 x \(10^{23}\)  atoms/mol = 1.82 x \(10^{23}\)  atoms

Q2.

a) The molar mass of Co(NO3)2 is 182.89 g/mol, which means that 1 mole of \(Co(NO_{3} )_2\)  contains 6.022 x \(10^{23}\)  molecules.

Therefore, we can use the following conversion factor:

3.604 x \(10^{24}\)molecules \(Co(NO_{3} )_2\)  x 1 mol/6.022 x \(10^{23}\)molecules = 5.99 mol \(Co(NO_{3} )_2\)

b) We can use the molar mass of \(Co(NO_{3} )_2\) to convert from molecules to grams:

2.55 x \(10^{21}\)  molecules \(Co(NO_{3} )_2\) x 182.89 g/mol ÷ 6.022 x \(10^{23}\)molecules/mol = 7.74 x \(10^{-3}\) g \(Co(NO_{3} )_2\)

Q3.

The density of water is 1.00 g/mL, which means that 1 liter of water has a mass of 1000 g.

The molar mass of water is 18.02 g/mol, which means that 1 mole of water contains 6.022 x \(10^{23}\) molecules.

Therefore, we can use the following conversion factor:

1000 g \(H_{2} O\) x 1 mol/18.02 g x 6.022 x \(10^{23}\) molecules/mol = 3.34 x \(10^{25}\) molecules

Q4.

The molar mass of HgO is 216.59 g/mol, which means that 1 mole of HgO produces 1 mole of O2.

Therefore, we can use the following conversion factor:

3.55 g O2 x 1 mol/32.00 g x 2 mol HgO/1 mol O2 x 216.59 g/mol = 15.1 g HgO

Q5.

The balanced equation shows that 1 mole of \(AgNO_{3}\)  reacts with 3 moles of Ag. The molar mass of \(AgNO_{3}\) is 169.87 g/mol, which means that 1 mole of AgNO3 contains 107.87 g of Ag.

Therefore, we can use the following conversion factor:

0.189 g \(AgNO_{3}\) x 1 mol \(AgNO_{3}\) /169.87 g x 3 mol Ag/1 mol \(AgNO_{3}\) x 107.87 g/mol = 0.072 g Ag

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What percentage of the Earth's surface is covered by oceans?

71 percentage

What percentage of the Earth's surface is covered by oceans?

71 percent/%

The property of water that allows it to dissolve many substances is its polarity.

What is polarity?

Polarity refers to the distribution of electrical charge in a molecule. A polar molecule has an uneven distribution of electrons, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end. This creates a dipole moment in the molecule.

Water molecules are polar, meaning that the electrons in the molecule are not distributed evenly, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end.

This polarity allows water molecules to form hydrogen bonds with other polar or charged molecules, such as ions and polar compounds. This type of bonding allows many substances, such as salt and sugar, to dissolve in water.

Additionally, the polarity of water molecules also allows them to interact with nonpolar substances through London Dispersion Forces, which also allows some nonpolar substances to be dissolved in water.

Hence, the polarity of water allows it to dissolve many substances.

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The ideal gas law, which relates the pressure, volume, temperature, and number of moles of an ideal gas, can be applied to real-world situations. By considering a specific scenario and applying the ideal gas law, we can analyze the behavior of gases and make predictions about their properties.

Let's consider a situation where a scuba diver is exploring underwater at a depth of 30 meters. We can apply the ideal gas law, specifically the form known as Boyle's law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.

Question: How does the pressure of the gas in the scuba tank change as the diver descends to a depth of 30 meters, assuming the temperature remains constant?

To answer this question, we can use the ideal gas law equation PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature. By keeping the temperature constant, we can observe the relationship between pressure and volume as the diver descends and calculate the change in pressure based on the change in volume.

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Answer:

when a substance is cool the particles in the substance contracts, but when heated the particles expand and pressure becomes high that way the particles tend to move faster in the container, in other to escape.

Fatty acids are part of the structure of many lipids except for sterols.

What are lipids?

Lipids are macromolecules made up of hydrocarbon chains or rings, which means that they contain a lot of energy. Lipids are organic molecules that contain carbon, hydrogen, and oxygen in a proportion that varies depending on the specific molecule. They are non-polar and insoluble in water, which means that they do not dissolve in water.

Lipids are categorized into three different classes: Fats and oils (triglycerides), phospholipids, and steroids. They are essential to many cellular functions, including energy storage, insulation, and membrane formation.

Examples of lipids include butter, oil, and cholesterol.

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Answer:

693000

Explanation:

Multiplying anything by 10 must follow the base 10 system rules.

That means we can simply move the decimal 5 places to the right.

6.93 x 10⁵ = 693000

My answer to the question is 693000.

Answer:The mass of phosphorus in 75.

0 g of calcium monohydrogen phosphate is 32.0 g.

Explanation:

This is because calcium monohydrogen phosphate is a compound that is composed of calcium cations (Ca2+) and monohydrogen phosphate anions (H2PO4-). The chemical formula for this compound is Ca(H2PO4)2. Since phosphorus has an atomic weight of 31 g/mol, and calcium monohydrogen phosphate contains two phosphorus atoms for each mole, the mass of phosphorus in 75.0 g of calcium monohydrogen phosphate is 32.0 g.

Explanation:

Atomic number = number of electrons = 10

Mass number = number of electrons + number of neutrons = 10 + 14 = 24

Answer :position

Explanation:

Potential energy is the energy stored in an object due to its position

Answer:

siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz

Explanation:

Q.A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.

(a) siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz

(using doppler's effect)

Doppler effect is the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by the relative motion of the observer and the wave source.

Christian Johann Doppler, an Austrian mathematician, and physicist discovered the Doppler effect in 1842.

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Answer: Tires air condenses and when it condenses it takes up less room.

Explanation: Hope that helps!

The final temperature that will be reached by the water is 30.26 °C.

The heat given off by the combustion of hydrogen and methane is calculated below:

For hydrogen:

Heat given off = 120 J/g * 5 g

Heat given off = 600 J

For methane:

Heat given off = 50 J/g * 10 g

Heat given off = 500 J

Total heat given off = (600 + 500) J

Total heat given off = 1100 J

Heat given off = Heat absorbed by water

Heat absorbed by water, Δq = 1100 J

From the formula, Δq = mcΔT

ΔT = Δq / m*c

mass of water = 50.0 g

c = 4.184 J/g/°C

ΔT = 1100 / (4.184 * 50)

ΔT = 5.26 °C

Final temperature of water = (25 + 5.26) °C

Final temperature of water = 30.26 °C

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Answer:

Answer is A. Ethyl.........

Answer:

D. ethane

Explanation:

Answer:

The correct answer is - at high pressure a huge amount of gases can be stored in less volume.

Explanation:

We already know that pressure is inversely proportional to the volume of gas which means if we increase the pressure the volume of gas becomes less.

P = 1/V

So in the scuba divers tank, the oxygen is filled at very high pressure so the high amount of the oxygen can be filled in less volume and which will last for longer than a normal pressure tank can last.

Peptide bonds form between amino acids to make a polypeptide, and then the amino acid side chains of the polypeptide attract and repel each other bending the protein into a coiled shape.

Amino acids are organic compounds that contain both amino and carboxylic acid purposeful agencies. Even though hundreds of amino acids exist in nature, by a ways the maximum critical are the alpha-amino acids, which contain proteins. Handiest 22 alpha amino acids seem in the genetic code.

Amino acids are required for the synthesis of frame protein and different vital nitrogen-containing compounds, such as creatine, peptide hormones, and a few neurotransmitters.

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Answer:

A hypothesis, such as one about cells, usually becomes a theory.

Explanation:

Answer:

Ca2+ I'm not sure hahahahhahah

Answer:

Ca

hope it is helpful..

The correct statement about pericyclic reactions is:

In pericyclic reactions, all bonds are broken and formed in a single step.

Pericyclic reactions are a class of organic reactions characterized by the simultaneous breaking and forming of multiple bonds in a concerted manner, meaning that all bond changes occur in a single step. This is in contrast to stepwise reactions where bonds are broken and formed in separate steps.

In a pericyclic reaction, the reactants rearrange their electrons in a concerted fashion, leading to the formation of new bonds and the breaking of existing bonds. This concerted process occurs through the overlap of molecular orbitals, allowing for the efficient transfer of electrons.

Pericyclic reactions are concerted reactions in which the breaking and forming of bonds occur simultaneously in a single step. They do not involve multiple steps or intermediates. The transition state in a pericyclic reaction is cyclic, not acyclic.

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Balanced trade refers to a situation in which a country's income from exports is equal to its expenditure on imports. This equilibrium in trade is reflected in the country's balance of trade statement, which records the value of exports and imports of goods and services. The net export, representing the difference between total exports and total imports, can be positive or negative.

In economics, a trade deficit occurs when a country's total imports surpass its total exports. Conversely, a trade surplus happens when a country's total exports exceed its total imports. These imbalances in trade are indicators of the economic relationship a country has with other nations.

The trade balance is an important concept in a country's economy and is calculated by subtracting the value of imports from the value of exports. A trade surplus occurs when a country earns more from its exports than it spends on imports, leading to increased export revenue. On the other hand, a trade deficit arises when a country's spending on imports exceeds its income from exports.

It is important to note that balanced trade does not necessarily imply a positive or negative outcome. It simply indicates a state where export earnings match import expenditures. The implications of balanced trade depend on various factors, including the country's economic goals, competitiveness, and overall economic conditions.

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Number of neutrons :

Argon=22

Boron=6

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): protons, electrons, and neutrons

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

Argon has an atomic number of 18 and a mass number of 39,948

number of neutrons =

\(\tt 39.948-18=21,948\approx 22\)

Boron has an atomic number of 5 and a mass number of 10,811

number of neutrons =

\(\tt 10.811-5=5.811\approx 6\)

Answer: 29 meters per second

Explanation:

65 mph=

65*1609.34 meters per hour=104607 meters per hour

1 hour=60 minutes

1 minute=60 seconds.

1 hour=60*60 seconds

1 hour=3600 seconds.

65 mph=104607/3600 meters per second

65 mph=29.0575 meters per second

29.0575 meters per second ==>29 meters per second

1. 7.53 x 10^23 moles of neon.

2. 6.31 x 10^24 atoms of tungsten is equal to 1 mole of tungsten.

3. In 54 grams of water, there are approximately 4.5 x 10^23 atoms of hydrogen.

4. How many grams are in 12.3 moles of dinitrogen pentoxide?

5. The molar mass of carbon dioxide is 44.01 g/mol.

6. Aluminum oxide has a molar mass of 101.96 g/mol. Therefore, 0.87 moles of aluminum oxide would be 87.17 g.

7. At STP (standard temperature and pressure), 6 L of hydrogen gas contains 0.024 moles of hydrogen.

8. At STP, 10.26 moles of neon will occupy a volume of 24.03 liters.

9.

No, a human is not at risk of a reaction if they were stung with a 0.00056-gram amount of histamine. 0.00056 grams of histamine is only 8.64 x 1010 molecules, which is far less than the threshold of 3.4 x 1015 molecules necessary to cause a reaction.

10. MgS2O6

i gotchu bro here you go