what element has the symbol of He

The mass of CH2Cl2 that can be melted by applying 7.80 kJ of energy at the melting point can be calculated using the equation of q = m * c * ΔT, where q is the energy applied, m is the mass, c is the heat capacity, and ΔT is the difference between the final and initial temperatures. In this case, the mass can be calculated as m = q / (c * ΔT). Plugging in the given values yields a mass of 0.126 g, rounded to three significant figures.

Therefore, 7.80 kJ of energy can melt 0.126 g of solid CH2Cl2 at the melting point. The equation used for this calculation assumes that the heat capacity and melting point of CH2Cl2 remain constant throughout the process, and thus the calculated value is only an estimate.

Know more about Melting point here

https://brainly.com/question/29578567#

#SPJ11

500 g of KClO3 will produce approximately 14.6 L of O2 gas at standard temperature and pressure (STP).

The balanced equation is 2 KClO3→2 KCl + 3 O2. This indicates that for every 2 moles of KClO3, 3 moles of O2 are produced. The number of moles of KClO3 can be calculated using the given mass and molar mass. In this case, the molar mass of KClO3 is 122.55 g/mol. The number of moles is calculated as follows:500 g/122.55 g/mol = 4.074 mol
Therefore, if 4.074 moles of KClO3 is consumed, the amount of O2 produced can be calculated using the mole ratio of KClO3 to O2.2 mol KClO3 : 3 mol O2Therefore, the number of moles of O2 produced can be calculated as follows:4.074 mol KClO3 × (3 mol O2 / 2 mol KClO3) = 6.111 mol O2
Finally, the volume of O2 produced can be calculated using the ideal gas law:PV = nRTwhere:P is the pressure, which is assumed to be 1 atmV is the volume of gas, which is what we're trying to solve forn is the number of moles of gas, which we calculated as 6.111 molR is the universal gas constant, which is 0.0821 L atm/K molT is the temperature in Kelvin, which is assumed to be 273 K (standard temperature).
Plugging these values in, we get:V = nRT/P = (6.111 mol)(0.0821 L atm/K mol)(273 K) / (1 atm)= 14.6 L.

for such more questions on temperature

https://brainly.com/question/4735135

#SPJ8

Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

To learn more about rate of reaction check the link below:

https://brainly.com/question/24795637

#SPJ4

Answer:

14.5 moles of CH4

Explanation:

There is 14.5 moles of carbon in the product CO2....there has to be 14.5 moles of carbon in the reactant CH4

   14.5 moles

The high-energy intermediate state in a chemical reaction is known as the activation energy, and it represents the energy required to initiate the reaction and break the chemical bonds in the reactants.

Every chemical reaction involves a change in energy as the reactants are transformed into products. This change in energy is associated with the formation of a high-energy intermediate state, which is unstable and quickly converts to the final products. The energy required to form this intermediate state is known as the activation energy for the reaction. The activation energy represents the minimum amount of energy required to initiate the reaction and break the chemical bonds in the reactants. Once this energy threshold is reached, the reaction proceeds spontaneously, releasing energy as the products are formed. The activation energy depends on the specific reaction and can be affected by factors such as temperature, concentration, and the presence of catalysts. Understanding the activation energy is important for predicting and controlling chemical reactions. By lowering the activation energy, for example, through the use of catalysts, it is possible to speed up reactions and make them more efficient. Additionally, knowing the activation energy can help to identify the rate-limiting step in a reaction and design strategies to optimize the reaction conditions.

Learn more about activation energy here :

https://brainly.com/question/28384644

#SPJ11

Pr{D C} = 0.94

The probability Pr{D C} represents the probability of not having the disease. In this case, the given information from Exercise 3.2.8 includes D (disease), D C (no disease), P (positive test result), and P C (negative test result). To find Pr{D C}, we need to consider the given probabilities.

The probability of having the disease, Pr{D}, is not explicitly given in the question. However, we can infer it by considering the complement of Pr{D C}. Since Pr{D C} represents the probability of not having the disease, the complement of Pr{D C} would represent the probability of having the disease.

Therefore, Pr{D} = 1 - Pr{D C}

Given that Pr{D C} = 0.06, we can calculate Pr{D} as follows:

Pr{D} = 1 - Pr{D C}

Pr{D} = 1 - 0.06

Pr{D} = 0.94

Hence, the probability of not having the disease (Pr{D C}) is 0.94.

Learn more about disease

brainly.com/question/943439

#SPJ11

The resulting reaction products are an ionic salt (NaCl) and an oxysalt (Ca3(PO4)2.

When NaCl is in contact with water, it dissolves and the water molecules separate their ions, therefore it will be in the aqueous phase.

In contrast, Ca3(PO4)2 is not soluble in water, therefore the molecule will settle out of solution as solid crystals.

So the answer will be C. 3NaCL(aq)+Ca3(PO4)2

The correct answer for this question is "A new system of units will have to be formulated."

When the mass (kg), force (N), and length (m) are the base units, it forms the SI system.

Therefore, the SI system is not appropriate in this scenario since it has meter, kilogram, and second as its base units. The only option remaining is to form a new system of units that would support these base units in order to resolve the problem.The Metric system is a popular system that is used all around the world. It is quite simple and has three main base units which include mass (gram), length (meter), and time (second). However, it is not acceptable for the aforementioned scenario. Instead, a new system of units will have to be formulated that would support the base units of mass, force, and length.

To know more about Metric system, visit:

https://brainly.com/question/25966695

#SPJ11

the total mass is 187g. The total mass of the reactant is always equal to total mass of the products.

explanation:

as per the given details, the reactant involved in the reaction are 37g of magnesium and 150g of sulfuric acid . the total of the reactant is 187g.

Answer:

Noble gases b/c its melts quicly that why enjoy

Engines do not need to be modified or adapted to use biodiesel, making it an easy and convenient fuel choice for high-demand engines.

High demand engines such as those found in airplanes and large trucks use biodiesel instead of ethanol due to the following reasons:

Biodiesel contains more energy per volume than ethanol.

Biodiesel is more readily available than ethanol worldwide.

Biodiesel can be used directly in most newer diesel engines.

The first and most important reason why high-demand engines use biodiesel instead of ethanol is that biodiesel contains more energy per volume than ethanol.

This means that engines running on biodiesel can run for longer periods of time before needing to refuel.

Another reason why high-demand engines such as those found in airplanes and large trucks use biodiesel instead of ethanol is that biodiesel is more readily available than ethanol worldwide.

This makes it much easier for engines to be fueled no matter where they are located.

Finally, biodiesel can be used directly in most newer diesel engines.

This means that engines do not need to be modified or adapted to use biodiesel, making it an easy and convenient fuel choice for high-demand engines.

Learn more about ethanol

brainly.com/question/29294678

#SPJ11

Two or more elements can chemically combine to form a compound through a chemical reaction. The elements lose their individual properties and form a new substance with a unique set of physical and chemical properties.

In a compound, the constituent elements are held together by chemical bonds, which can be covalent, ionic, or metallic. Covalent compounds share electrons between atoms, while ionic compounds form through the transfer of electrons from one atom to another, resulting in positively and negatively charged ions that attract each other. Metallic compounds involve a sea of electrons shared between metal atoms. The composition of a compound is fixed and can only be separated by chemical means, as opposed to mixtures, which can be separated physically.

Learn more about elements can chemically here

https://brainly.com/question/9249660

#SPJ11

The number of moles of Ba(OH)₂ present in 275 ml of 0.400 M Ba(OH)2 solution is 0.11 moles.

Moles of Ba(OH)₂ present in 275 ml of 0.400 M Ba(OH)₂ solution can be calculated as follows:

First of all, we should be familiar with the formula of Molarity which is as follows:

Molarity (M) = moles of solute / liters of solution We can rearrange this formula to calculate the moles of solute as follows:

moles of solute = Molarity (M) × liters of solution (L)Now let's apply the above formula to the given problem. Molarity (M) = 0.400 M, liters of solution (L) = 275 ml or 0.275 L (since 1 L = 1000 ml)moles of Ba(OH)₂ = 0.400 M × 0.275 L= 0.11 moles.

Therefore, the number of moles of Ba(OH)₂ present in 275 ml of 0.400 M Ba(OH)₂ solution is 0.11 moles.

To know more about moles refer here: https://brainly.com/question/29724957#

#SPJ11

Answer:

Beta Decay

Explanation:

Beta decay conserves the number of electrons and their associated neutrinos  Since a proton or neutron has lepton number zero, β+ decay (a position, or antielectron) must be accompanied with an electron neutrino, while β− decay (an electron) must be accompanied by an electron antineutrino. An example of electron emission (β− decay) is the decay of C 14 into N14 with a  half-life of about 5,730 years

In this form of decay, the original element becomes a new chemical element. This new element has an unchanged mass number A, but an atomic number Z that is increased by one.

Answer:

Beta decay

In beta decay, a neutron is converted into a proton and an electron. The electron is then fired out of the nucleus whilst the proton remains.

This means that the the neutron number decreases by 1, and the proton number increases by 1 (therefore the nucleon number remains unchanged).

Answer:

Explanation:

Thus the chemical formula for aluminium permanganate is formed by cross exchanging the coefficient of valencies of aluminium and permanganate (with each other). Thus the chemical formula for aluminium permanganate is represented as : Al(MnO4)3.

Answer:

1.Cooking an egg

2. Burning wood

Hope it helps :)

The crash where the cone experience a stronger force is option D because: Crash 1: the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

The ball is drawn back to Earth by gravitational force. The ball returns to Earth as a result of friction. The ball is forced back toward Earth by magnetic force.

A puck's velocity changes when a player makes contact with it when it is still. He causes the puck to speed up, in other terms. The hockey stick's force, which causes the acceleration, is responsible. The velocity grows as long as this force is in motion.

Therefore, the force applied to an object must be larger than what is required for a progressive slowing down if the object must be slowed down quickly. For instance, a bicycle's brakes will slow or stop it more quickly the more force is given to it.

Learn more about Force from

https://brainly.com/question/12785175
#SPJ1

See full question below

After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone.

Use the information from the diagram to answer.

In which crash did the cone experience a stronger force? How do you know?

answer choices

There was no force on the cone. In both crashes, only the hockey puck experienced a force.

The diagram doesn’t tell you anything about the force on the cone. It only gives information about the force on the pucks.

It was the same force in both crashes; the hockey puck changed speed by the same amount in each crash, so the force on the cone was the same each time.

Crash 1; the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

Answer:

A dam like structure used to capture energy from masses of water moving in or out of a bay of rivers due to tidal force is called tidal barrage.

Explanation:

It may help you to solve question.

Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state at a constant temperature and pressure. It is a measure of the strength of the intermolecular forces holding the molecules together in the liquid phase.

Heat of vaporization:

Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state at a constant temperature and pressure. It is a measure of the strength of the intermolecular forces holding the molecules together in the liquid phase.

When a substance is heated, the added energy increases the kinetic energy of the molecules, causing them to move faster. As the temperature rises, the average kinetic energy of the molecules increases, and eventually, the molecules have enough energy to overcome the intermolecular forces and escape from the liquid phase, forming a gas.

The heat of vaporization is specific to each substance and is typically expressed in units of joules per gram (J/g) or calories per gram (cal/g). It is an important property in various applications, such as in the design of cooling systems, understanding phase changes, and calculating energy requirements for processes involving vaporization.

Fact:

The heat of vaporization for water is approximately 40.7 kilojoules per mole (kJ/mol) at its boiling point of 100 degrees Celsius.

About heat of vaporization here:

https://brainly.com/question/12625048

#SPJ11

The heat of vaporization is the amount of heat required to convert one gram of a substance from its liquid state to its gaseous state without any change in temperature. It is denoted by delta Hvap.

This is a measure of the energy that is required to overcome the intermolecular forces that hold a liquid together and break the bonds between the molecules to form a gas.Heat of vaporization is the amount of heat required to convert one gram of a substance from its liquid state to its gaseous state without any change in temperature.

There are many interesting phenomena where the heat of vaporisation can be seen. For instance, heat is continuously added to liquid water when it boils on a hob in order to overcome the intermolecular interactions and turn it into water vapour. Similar to how sweat evaporates from our skin, the heat that is removed from us as the sweat changes from a liquid to a gas cools us down.

Learn more about heat of vaporization at https://brainly.com/question/31804446

#SPJ11

Answer:

130

Explanation:

Maintain hot food at 135°F or above. Properly cooked roasts may be held at 130°F or above.

135°F is the minimum hot holding temperature for fried chicken. The most often used scales are indeed the Celsius scale.

Temperature is a physiological measure that quantifies our feelings of hotness and coolness. A thermometer is used to measure temperature.

Thermometers were calibrated in a variety of temperature scales that have traditionally been defined by various reference points including thermometric substances.

The most often used scales are indeed the Celsius scale, with the unit sign °C, the Fahrenheit level (°F), as well as the Scale parameter (K), with the latter being mostly used for scientific reasons. The kelvin is one of the International System of Units' seven basic units (SI). 135°F is the minimum hot holding temperature for fried chicken.

Therefore, 135°F is the minimum hot holding temperature for fried chicken.

To learn more about temperature, here:

https://brainly.com/question/23411503

#SPJ2

The correct statement about the buddy system for allocating memory is:

C. With the buddy system, memory segments can be either divided or coalesced to satisfy an allocation request.

The buddy system is a memory allocation technique used in operating systems. It divides memory into fixed-size blocks or segments, typically in powers of two. When a memory allocation request is made, the system looks for a free block of suitable size. If the block is larger than required, it can be divided or split into smaller blocks to satisfy the request. Conversely, if adjacent blocks are free, they can be coalesced or merged to form a larger block for allocation.

A. The buddy system is not specifically designed for quickly allocating pages on demand for user-space applications. It is a general memory allocation strategy used in various contexts.

B. The buddy system may still result in internal fragmentation. Internal fragmentation occurs when allocated memory blocks are slightly larger than the requested size, leaving unused space within the block.

D. The buddy system does not guarantee physically contiguous memory allocation. It can allocate memory from different available blocks, which may or may not be physically contiguous.

Therefore, the only true statement is C. With the buddy system, memory segments can be either divided or coalesced to satisfy an allocation request.

To know more about system visit:  

https://brainly.com/question/13453484

#SPJ11

Answer:

Helium

Explanation:

I believe helium is what your are looking for, you didn't quite make it clear what you wanted but hope this can be of some use.

Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus.

Could I have branliest, heart with 5 stars

Thanks.

Answer:

18.0 g H₂O

Explanation:

To find the mass of water (H₂O), you need to (1) convert grams O₂ to moles O₂ (via the molar mass), then (2) convert moles O₂ to moles H₂O (via mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂O to grams H₂O (via the molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.

Molar Mass (O₂): 2(15.998 g/mol)

Molar Mass (O₂): 31.996 g/mol

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

2 H₂ + 1 O₂ -----> 2 H₂O

16.0 g O₂          1 mole            2 moles H₂O         18.014 g
---------------  x  ----------------  x  ---------------------  x  -----------------  = 18.0 g H₂O
                        31.996 g             1 mole O₂             1 mole

The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

Learn more about scientific statement at

https://brainly.com/question/19894291

#SPJ1

complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

Answer:

33.085476 meV ≈ 33 meV

Explanation:

Hope this helped!

The final temperature of both substances at thermal equilibrium is 51.96°C.

Solution:

31.91 T =10374.27

T= 325.11 K or T= 51.96 °c

Final equilibrium Temperature (T) = 51.96°C.

Two systems are said to be in thermal equilibrium when they are in contact with each other and there is no energy flow between them. Simply put, thermal equilibrium means that two systems are at the same temperature. The zero law of thermodynamics states that if two systems are in thermodynamic equilibrium with his third system, then the original He said that the two systems are in thermal equilibrium with each other.

Learn more about Thermal equilibrium here:- https://brainly.com/question/14904792

#SPJ4

Answer:

This is a Fluorine atom

The valproic acid contains 0.0645 milligrams

1000 microgram = 1 milligram

From the question given, the following data were obtained:

We can convert 64.5 micrograms to milligrams as illustrated below:

1000 microgram = 1 milligram

Therefore,

64.5 micrograms = (64.5 micrograms × 1 milligram) / 1000 microgram

64.5 micrograms = 0.0645 milligrams

Thus, the valproic acid contains 0.0645 milligrams

Learn more about conversion:

https://brainly.com/question/1444594

#SPJ1

Answer:Plasma is highest energy state of matter.It consists of electrons,protons and neutral particles.

Explanation:(1) Plasma has a very high electrical conductivity .

(2) The motion of electrons and ions in plasma produces it's own electric and magnetic field

(3)It is readily influenced by electric and magnetic fields .

(4)It produces it's on electromagnetic radiations.