An copper mass is heated and placed in a foam cup calorimeter containing 45.0 mL of water at 24.0 degrees celcius. The water reaches a temparture of 75 degrees celcius. How many joules of heat were released by the copper? The density of water is 1g/mL. The specific heat of water is 4.18 J/g degrees Celsius.....

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Answer:

Sulfur belongs to the chalcogen family. Other members of the family are oxygen, selenium, tellurium, and polonium. These elements make up Group 16 (VIA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to each other.

The term chalcogen comes from two Greek words meaning "ore forming." An ore is a naturally occurring mineral used as a source for an element. Many ores are compounds of a metal and oxygen or a metal and sulfur. Compounds that contain two elements, one of which is sulfur, are called sulfides. For example, a beautiful gold-colored mineral is called pyrite, or "fool's gold," because it looks so much like real gold. Pyrite is iron sulfide (FeS 2 ).

Sulfur was known to ancient peoples. Its physical and chemical properties are very distinctive. It often occurs as a brilliant yellow powder. When it burns, it produces a clear blue flame and a very strong odor.

SYMBOL

S

ATOMIC NUMBER

16

ATOMIC MASS

32.064

FAMILY

Group 16 (VIA)

Chalcogen

PRONUNCIATION

SUL-fur

Sulfur, also spelled as sulphur, is a very important element in today's world. Its most important use is in the manufacture of sulfuric acid (H 2 SO 4 ). There is more sulfuric acid made than any other chemical in the world. It has an enormous number of important uses.

Discovery and naming

Sulfur must have been well known to ancient peoples. They sometimes referred to it as brimstone. Sulfur sometimes occurs in bright yellow layers on the top of the earth. It has a sharp, offensive odor. When it burns, it gives off a strong, suffocating smell. The odor is like that produced when a match is struck.

The Bible mentions brimstone in a number of places. For example, Sodom and Gomorrah were two towns destroyed by God for the wicked ways of their citizens: "The Lord rained upon Sodom and upon Gomorrah brimstone and fire."

But ancient people certainly did not think about sulfur the way modern chemists do. In fact, they used the word "element" to talk about anything that was basic. Ancient Greek philosophers, for example, thought that everything consisted of four elements: earth, fire, water, and air. Other philosophers thought there were only two elements: sulfur and mercury.

But early thinkers were often confused as to what they meant by the word "sulfur." They often were talking about anything that burned and gave off large amounts of smoke. To them, "sulfur" was really a "burning substance." It took centuries for scientists to identify sulfur as an element.

Explanation:

The most chemically similar element like sulfur is oxygen.

Oxygen is the most similar element to sulfur.

Let's see the similarity between oxygen and sulfur:

Sulfur - 0.88

Oxygen - 0.48

Sulfur -  1.84

Oxygen - 1.40

Sulfur (2.5) is less electronegative than oxygen, (3.4)

Thus, oxygen is most similar to sulfur.

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Explanation: I THINK THAT YOUR POSITIVELY CHARGED HAIR WOULD BE ATTRACTED TO THE NEGATIVELY CHARGED BALLOON AND WOULD RISE UP TO MEET BALLOON.

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Answer:

C) Your positively charged hair would be attracted to the negatively charged balloon and would rise up to meet the balloon.

Explanation:

Your positively charged hair would be attracted to the negatively charged balloon and would rise up to meet the balloon. This answer is explained in the prompt.

Yes, radioactive decay releases energy

C) Summer

B) Full Moon

A) One (look up a lunar calendar, those can help with these question)

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Answer:

= 2.659 g NaCl

Explanation:

Molarity of a substance is given by the formula;

Molarity = moles/Volume in liters

Thus;

Number of moles = Molarity ×  volume in liters

                              = 1.3 M × 0.035 L

                              = 0.0455 Moles

But, the molar mass of NaCl is 58.44 g/mol

The mass of NaCl is therefore;

     = 0.0455 g × 58.44 g/mol

     = 2.659 g NaCl

The mass of NaCl in a 35-mL sample of a 1.3 M NaCl solution is approximately 2.7 g.

To calculate the mass of NaCl in a 35-mL sample of a 1.3 M NaCl solution, you need to start with the definition of molarity, which is moles of solute per liter of solution. First, convert the volume of the solution from milliliters to liters by dividing by 1000. Therefore, 35 ml equals 0.035 L.

Knowing that molarity(M) = mole/liters, we can use the given molarity to find out that there are 0.0455 moles of NaCl in our solution since (1.3 mol/L) × (0.035 L) = 0.0455 Mol.

Finally, use the molar mass of NaCl (58.44 g/mol) to convert this molar quantity into grams. That is (0.0455 Mol) × (58.44g/mol) = 2.66 g. So, the mass of NaCl in the solution is approximately 2.7 g.

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The first model of the atom was developed by JJ Thomson in 1904, who thought that atoms were composed purely of negatively charged electrons. This model was known as the 'plum pudding' model

Final answer:

Scientific theories and models change over time due to new evidence and experimentation, leading to more accurate predictions and descriptions of natural phenomena. The dynamic nature of science, such as in phylogenetic modeling in biology, necessitates continual revision and refinement of theories. This iterative process propels scientific discovery and understanding.

Explanation:

Why Theories and Models Change Over Time

The development of scientific theories and models is an iterative process, continually influenced by new data and experiments. As scientists observe nature more meticulously, they gather evidence that may either corroborate or challenge existing theories. The predictive ability of models plays a crucial role in their validity; precise models enable accurate descriptions and predictions about natural phenomena. For instance, Albert Einstein's general theory of relativity radically improved our understanding of gravity, leading to predictions and the eventual discovery of black holes.

In fields like biology, the concepts of phylogenetic modeling have undergone significant change. Scientists propose new models as new research provides insights into the relationships between organisms, showcasing the dynamic nature of scientific study. Ultimately, a theory must withstand rigorous testing, and when new evidence warrants, theories are refined or replaced to incorporate this newfound understanding.

The pathway from data to scientific discovery is often directed by the models, theories, and laws that scientists construct. These not only assist in analyzing collected data, but also guide researchers to novel discoveries, furthering the cycle of scientific progress.

Answer:

Carbon forms the key component for all known life on Earth.

Explanation:

Complex molecules are made up of carbon bonded with other elements, especially oxygen and hydrogen and frequently also with nitrogen, phosphorus and sulfur. Carbon is abundant on Earth. It is also lightweight and relatively small in size, making it easier for enzymes to manipulate carbon molecules.

Muscles convert chemical energy into mechanical energy

Answer:

Mechanical

Explanation:

I did it.

Try this if it helps:

Final answer:

A manufacturing plant polluting a river is an example of point source pollution because the pollution originates from a single, identifiable location. Correct option is A. point source

Explanation:

A manufacturing plant that has been found guilty of polluting the nearby river is an example of point source pollution. Point source pollution is characterized by contaminants entering a water body at a specific, identifiable location, such as a discharge pipe from a factory. This type of pollution, unlike nonpoint source pollution, comes from a single, identifiable source and is typically easier to manage and control because it originates from a fixed location.

On the other hand, nonpoint source pollution occurs when pollutants are introduced into water bodies from widespread areas, making the exact point of origin difficult to identify. Fertilizers applied to residential lawns and gardens, for instance, can end up in water bodies through nonpoint-source processes like surface run-off or movement through groundwater.

Answer: Is there a list of birds, if not, it could be a seagull. They are arounf the water a lot and have sharp beaks which could possibily allow them to eat the same way as the eagle.

Birds that most likely catch and eat their food the way an eagle does include hawks and the African fish eagle. These birds, like the eagle, are raptors and utilize similar hunting and feeding techniques.

The question asks which bird most likely catches and eats its food in the same way as an eagle does. As the text mentions, eagles are examples of raptors, which are birds of prey. They use their clawed feet, also known as talons, to capture and kill their prey, which includes fish.

Similar to eagles, other birds that are known to catch and eat fish include the African fish eagle and hawk. All of these birds are adapted to hunting and consuming their prey similarly. Their sharp, hooked beak is perfect for tearing apart their prey and their strong legs and talons are well-equipped for grabbing and securing their catch.

Therefore, an African fish eagle or a hawk would most likely catch and eat its food the way an eagle does, flying with the fish to a safe location, such as a tree branch, before tearing it into small pieces to eat.

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Answer: 141,95 g

Answer:

Elements in group 15 will gain electrons and it will gain 3 electrons to obtain a noble gas structure.

Explanation:

A noble gas structure is obtained when it completes a full octet around the atom. Meaning it has 8 electrons in its outer shell.

Group 15 is also known as Group 5A or the Nitrogen group. The nitrogen group have 5 valence electrons. Now something to remember about gaining and losing electrons. When the outershell is more than half full, it is more likely to attract electrons to itself. When the outershell is less than half full, it is more likely to lose electrons.

So in the case of group 15, which has 5, it is closer to 8, so it will gain an electron. To complete the octet, it will need 3 more electrons.

Answer:

Explanation:The silica tetrahedron is a molecule containing four oxygen atoms and one silicon atom. It resembles a triangular pyramid, with the silicon atom located in the middle and one oxygen atom located at each of the four corners.

The structure of olivine is described as isolated tetrahedral because each tetrahedron is bonded to either a magnesium ion or an iron ion.

Although some minerals always appear the same color, many vary in color due to trace elements within the mineral. These trace elements can alter the mineral’s coloring.

Minerals with a metallic luster do not allow light to pass through. Minerals with a nonmetallic luster do allow light to pass through.

In minerals, cleavage refers to breaks that occur along a specific plane. Fractures refer to irregular breaks.

Answer:

1.The silica tetrahedron is a molecule containing four oxygen atoms and one silicon atom. It resembles a triangular pyramid, with the silicon atom located in the middle and one oxygen atom located at each of the four corners.

2.The structure of olivine is described as isolated tetrahedral because each tetrahedron is bonded to either a magnesium ion or an iron ion.

3.Although some minerals always appear the same color, many vary in color due to trace elements within the mineral. These trace elements can alter the mineral’s coloring.

4.Minerals with a metallic luster do not allow light to pass through. Minerals with a nonmetallic luster do allow light to pass through.

5.In minerals, cleavage refers to breaks that occur along a specific plane. Fractures refer to irregular breaks.

Answer:

Explanation:

You simply have to multiply it by the molar mass =

m = 50mol SnSO4 x 214.773 g/mol

m = 10.738 g SnSO4

Answer:

Mass of 50 moles of tin(II) sulfate is 10,738 grams.

Explanation:

[tex]n=\frac{m}{M}[/tex]

Where:

n = moles of compound

m = mass of compound

M = molar mass of the compound

Moles of tin(II) sulfate , n= 50 moles

Molar mass of tin (II) sulfate , M= 214.77 g/mol

m = n × M

[tex]m=50 moles \times 214.77 g/mol=10,738 g[/tex]

Mass of 50 moles of tin(II) sulfate is 10,738 grams.

Answer:

Chemical reaction

Explanation:

Answer:

[tex]\boxed{\text{53 g }}[/tex]

Explanation:

You don't give the reaction, but we can get by just by balancing atoms of Na.

We know we will need the partially balanced equation with masses, moles, and molar masses, so let’s gather all the information in one place.

M_r:                                 142.04  

             2NaOH + … ⟶ Na₂SO₄ + …  

n/mol:      0.75

1. Use the molar ratio of Na₂SO₄ to NaOH to calculate the moles of NaF.

Moles of Na₂SO₄ = 0.75 mol NaOH × (1 mol Na₂SO₄/2 mol NaOH

= 0.375 mol Na₂SO₄

2. Use the molar mass of Na₂SO₄ to calculate the mass of Na₂SO₄.

Mass of Na₂SO₄ = 0.375 mol Na₂SO₄ × (142.04 g Na₂SO₄/1 mol Na₂SO₄) = 53 g Na₂SO₄

The reaction produces [tex]\boxed{\text{53 g }}[/tex] of Na₂SO₄.

Final answer:

0.75 moles of NaOH would form 0.375 moles of Na2SO4, based on the stoichiometry of the chemical equation provided. The mass of Na2SO4 produced would be 53.25 grams.

Explanation:

The reaction described involves NaOH and amounts to a stoichiometry problem where we determine the amount of a product formed from a given amount of reactant. In the given chemical equation:
4NaOH(aq) + 2S(s) + 302(g) → 2Na2SO4(aq) + 2H₂O(l),
there is a clear stoichiometric relationship between NaOH and Na2SO4. Specifically, 4 moles of NaOH yield 2 moles of Na2SO4, which means 2 moles of NaOH would produce 1 mole of Na2SO4. Given that 0.75 moles of NaOH reacted, they would form half of 0.75 moles of Na2SO4, which is 0.375 moles of Na2SO4. To find the mass in grams, we would need the molar mass of Na2SO4, which is approximately 142 g/mol.

Moles of Na2SO4 formed = (0.75 moles NaOH × 1 mole Na2SO4) / 2 moles NaOH

Mass of Na2SO4 formed = 0.375 moles × 142 g/mol = 53.25 grams.

Final Answer:

The process occurring in the photograph of the glacier is Calving, where chunks of ice break off from the glacier's edge, forming icebergs in bodies of water.

B. Calving

Explanation:

Glacial calving is the process captured in the photograph of the glacier. Calving occurs when chunks of ice break off from the glacier's edge, forming icebergs in bodies of water. This process is primarily driven by the glacier's continuous movement and the mechanical stress caused by its own weight. Calving is a significant contributor to ice loss from glaciers and plays a crucial role in the dynamics of glacier systems.

In the photograph, the presence of large ice blocks breaking away from the glacier's terminus is a clear indication of calving. This process is influenced by a combination of factors, including the glacier's size, ice temperature, and the surrounding environment. As the glacier advances, the ice at its terminus experiences pressure and tension, eventually leading to the fracturing and separation of ice chunks. The resulting icebergs contribute to the redistribution of glacial ice and have implications for sea level rise.

Understanding the specific glacial processes at play, such as calving, is vital for assessing the impact of climate change on glacier dynamics and predicting potential consequences for sea level and environmental systems. Monitoring and studying such phenomena contribute to a more comprehensive understanding of Earth's changing landscapes.

Full Question:

2. Which process is occurring in this photograph of a glacier?

A. Melting

B. Calving

C. Abrasion

D. Plucking

Answer:

Option B

Explanation:

We know that if the temperature of a gas increaseas, then the kinetic energy and the average speed increases too. For that reason, the correct answer is option B).

Answer: The correct answer is Option B.

Explanation:

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

[tex]K=\frac{3RT}{2N_A}[/tex]

where,

K = Average kinetic energy

R = Gas constant

T = Temperature of the system

[tex]N_A[/tex] = Avogadro's number

From the above relation, it is visible that kinetic energy is directly related to the temperature of the system. So, if average kinetic energy of the system increases, it means that temperature also increases and vice-versa.

Hence, the correct answer is Option B.

The answer is -B

if temperature and pressure are constant, the number of particles is proportional to the volume. Another way to keep the pressure constant as the volume increases is to raise the average force that each particle exerts on the surface. This happens when the temperature is increased.

Answer:

B, The volume will decrease.

Explanation:

The decay of a carbon-11 atom decreases the number of protons and increases the number of neutrons and causes it to emit radiations.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

When an atom undergoes decay, the number of protons present in the nucleus are decreased and radiations are emitted.

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The decay of a carbon-11 atom undergoes beta-plus decay (β+ decay)and this causes it to emit emits a positron (β+) and a neutrino (v).

Step 1: Unstable Nucleus

A carbon-11 atom has an unstable nucleus because it contains an excess of protons compared to neutrons. This instability makes it prone to radioactive decay.

Step 2: Positron Emission

During positron emission, a process that stabilizes the nucleus, the following occurs:

Answer:

It is the process in which a known amount of solution of known concentration is added to the concentration of the another solution to determine the concentration of unknown solution.

Explanation:

Answer:

Titration

Explanation:

Answer:

Pure Beryl is colorless.

Explanation:

The wide range of impurities cause the diverse amount of colors and many varieties. The green color in emerald is usually caused by traces of the element chromium, and the blue color of aquamarine usually by iron.

The element that beryl, emeralds, and aquamarine have in common is beryllium.

Beryl is a mineral composed of beryllium aluminum cyclosilicate (Be3Al2Si6O18). When beryl is pure and green in color due to traces of chromium and sometimes vanadium, it is known as emerald, which is a precious gemstone. On the other hand, when beryl is blue to blue-green in color due to traces of iron, it is known as aquamarine, another valuable gemstone.

Answer:

Dependent variable

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Brainliest please

Explanation:

Answer:

-116.42°C

Explanation:

According to pressure law which states that the pressure of a fixed mass of a gas is directly proportional to its absolute temperature at constant volume.

Therefore;

P1/T1 = P2/T2

P1 = 811 mmHg

P2 = 415 mmHg

T1 = 33°C + 273°C = 306 K

Therefore;

T2 = P2T1/P1

    = (415 × 306)/ 811

    = 156.58 K

Therefore; temperature = 156.58 - 273 = -116.42°C

Answer:

-116.42°C

Explanation:

Answer:

A. to determine the efficiency of the reaction

Explanation:

Final answer:

The percent yield is calculated to assess the efficiency of a chemical reaction by comparing the actual yield to the theoretical yield. The correct option is (A).

Explanation:

Finding the percent yield of a reaction is necessary to determine the efficiency of the reaction, which is option A.

The percent yield is calculated by dividing the actual yield, the amount of product actually obtained from the reaction, by the theoretical yield, the maximum amount of product predicted by stoichiometry from the given amounts of reactants, and then multiplying by 100 to express it as a percentage.

The percent yield assesses how much product is obtained compared to what could have been obtained under ideal conditions. It reflects reaction efficiency, accounting for losses due to factors like incomplete reactions, side reactions, and difficulties in product recovery.

Answer:

[tex]\boxed{\text{1000 g}}[/tex]

Explanation:

We know we will need a balanced equation with masses, moles, and molar masses, so let’s gather all the information in one place.

M_r:                           84.01  

              H₂SO4 + 2NaHCO₃ ⟶ Na₂SO₄ + 2CO₂ + 2H₂O

n/mol:         6

1. Use the molar ratio of NaHCO₃ to calculate the moles of NaHCO₃.

[tex]\text{Moles of NaHCO$_{3}$ = 6 mol H$_{2}$SO$_{4}$} \times \dfrac{\text{2 mol NaHCO$_{3}$}}{\text{1 mol H$_{2}$SO$_{4}$}}\\=\text{12 mol NaHCO$_{3}$}[/tex]

2. Use the molar mass of NaHCO₃ to calculate the mass of NaHCO₃.

[tex]\text{Mass of NaHCO$_{3}$ = 12 mol NaHCO$_{3}$} \times \dfrac{\text{84.01 g NaHCO$_{3}$}}{\text{1 mol NaHCO$_{3}$}}\\\\= \text{1000 g NaHCO$_{3}$}[/tex]

You must use [tex]\boxed{\textbf{1000 g}}[/tex] of NaHCO₃.

C Kinetic Energy is the energy of motion

A quality I would say of a physical substance is hardness

Hardness

it's something you can see and tell without changing the composition of matter

Answer:

C stays the same

Explanation:

As a sample of a radioactive element decays, its half-life: remains the same.

A nuclear reaction can be defined as a type of reaction in which the nucleus of an atom of a radioactive element is transformed by being joined (fusion) or split (fission) with the nucleus of another atom.

In Chemistry, the half-life of a sample of a radioactive element would remain the same even as it experiences a decay of its sub-particles.

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