hi please list lots of binary ionic compounds :)​

The energy absorbed when 12g of liquid water raises from 55 °C to 100°C and then boils at 100°C. is 2.268 KJ.

mass of water = 12 g

specific heat capacity of water = 4.20 J/ °C

change in temperature 55 °C to 100 °C = ( 100  °C - 55 °C )

                                                                 = 45  °C

The energy absorbed = mCΔT

where , m = mass

C = specific heat capacity

ΔT = change in temperature

substituting the values in the formula :

q = mCΔT

  =  12 g × 4.20 J/g °C × 45  °C

  = 2268 = 2.268 KJ

Thus, The energy absorbed when 12g of liquid water raises from 55 °C to 100°C and then boils at 100°C. is 2.268 KJ.

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The statements that correctly explains the use of physical properties of a substance to separate mixtures are

Statement 1: When substances are mixed together, they retain their physical properties.

Statement 3: When substances are mixed together, the mixture assumes the physical properties of each individual substance.

Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated as there are no chemical reaction between each other.

Mixtures are compounds that retain their respective physical properties even though they were mixed together as there are no reaction between the two. Thus, these physical properties can be used to separate mixtures. Example: Oil in water. They have different densities. Thus, oil will float on water. We can exploit this physical property and separate them using separating funnel.

Mixtures contain different substances with different properties and chemists cannot separate one item from the mixture by forcing it to undergo a chemical change as there is no chemical reaction.

When substances are mixed together, you can see each individual component. But without knowing their property, we cannot separate them

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Answer:

\(75\ \text{g}\)

Explanation:

t = Time = 180 years

\(t_{1/2}\) = Half-life of titanium = 60 years

\(N_0\) = Initial amount of titanium = 600 g

We have the relation

\(N=N_0e^{-\lambda t}\\\Rightarrow N=N_0e^{-\dfrac{\ln 2}{t_{1/2}}t}\\\Rightarrow N=600e^{-\dfrac{\ln 2}{60}\times 180}\\\Rightarrow N=75\ \text{g}\)

The mass that is left after 180 years is \(75\ \text{g}\).

Answer:

There are three nuclei and one lone pair, so the molecular geometry is trigonal pyramidal.

Explanation:

Answer:

C. Hardness

Explanation:

A P E X

According to the forces of attraction, metallic structures have high melting and boiling points as they possess ionic bonding.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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Answer:

b

Explanation:

i took the test

Answer:

D.  Helium

Explanation:

By definition, the atomic number of an element is the number of protons in its nucleus.  2 protons mean atomic number 2:  Helium.

As the number of protons and electrons are  same in an atom,helium atoms all have 2 protons.

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.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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The equilibrium constant for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) at 328.0 K is approximately 1.49 × 10^20.

The equilibrium constant, K, for a reaction can be calculated using the Gibbs free energy (ΔG) and the temperature (T). The relationship between these parameters is given by the equation:
ΔG = -RT ln(K)
where R is the gas constant (8.314 J/mol K). Gibbs free energy can also be related to enthalpy (ΔH) and entropy (ΔS) through the equation:
ΔG = ΔH - TΔS
Given that the enthalpy change (ΔH) for the reaction is -92.2 kJ and the entropy change (ΔS) is -198.7 J/K, we can calculate the equilibrium constant at a temperature of 328.0 K.
First, convert ΔH to J/mol:
ΔH = -92,200 J/mol
Now, calculate ΔG at the given temperature:
ΔG = ΔH - TΔS = -92,200 J/mol - (328.0 K × -198.7 J/K)
ΔG = -48,855.6 J/mol
Next, use the ΔG value to find the equilibrium constant (K) at 328.0 K:
-48,855.6 J/mol = -(8.314 J/mol K) × 328.0 K × ln(K)
Solve for K:
K ≈ 1.49 × 10^20
Therefore, the equilibrium constant for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) at 328.0 K is approximately 1.49 × 10^20.

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The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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The chemical equation that depicts a balanced chemical reaction is the one in choice B.

In this choice, the same number of atoms of each elements is in both, reactants and products sides, which means that the law of conservation of mass is fulfilled.

The correct answer is choice B.

Answer:

Fusion doesn't produce runway chain reactions the way fission can, so there's no need to worry about meltdowns.

Yep, it happened to me

The chemical formula of the isotopes given in this question is as follows:

Isotopes are any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei. Thus, isotopes have the same atomic number but a different mass number.

The chemical formula of an isotopic element is written in the following format: A/Z X

Where;

The atomic number is the number of protons in an atom while the mass number is the sum of the proton number and neutron numbers in the atom.

The chemical formula of the respective isotopes given in this question is outlined in the main answer section.

Note that nucleon number was used for some of the elements. The nucleon number is the mass number of the elements.

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Answer:

2. volume

Explanation:

Answer:

volume

Explanation:

Combined gas law states that when the number of moles of an ideal gas are held constant, the volume and pressure of the gas are inversely proportional while being directly proportional to temperature.

Under combined gas law, the three (3) main gas laws are combined together and these include:

Mathematically, the combined gas law is given by the formula:

\(\frac{PV}{T} =k\\\\\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)

Where:

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Recently, the major causes of acid-generating emission have shifted from nitrogen oxides to sulfur oxides and ammonia.

This shift is a result of a decrease in NOx emissions due to improved controls on the emissions from motor vehicles and large stationary sources, and an increase in SOx and ammonia emissions from agricultural sources and stationary power plants.

Based on the explanation given above,

the correct option among the given options is B) sulfur oxides to nitrogen oxides and ammonia.

Nitrogen is an important component of many organic and inorganic compounds, and it is essential for life. It makes up about 78% of the Earth's atmosphere and is commonly used in fertilizers, explosives, and refrigerants.What is Ozone?Ozone is a type of gas that is found in the Earth's atmosphere. It is created naturally by the sun's ultraviolet rays and by lightning. It is also produced by human activities, such as burning fossil fuels.

Ozone is important because it protects us from harmful UV radiation from the sun.

However, too much ozone at ground level can be harmful to human health and the environment.

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The amount of aluminum that reacted is approximately 0.069 grams.

To determine the mass of aluminum that reacted, we need to use the ideal gas law and consider the partial pressure of hydrogen gas. First, we calculate the pressure of hydrogen gas by subtracting the partial pressure of water vapor from the total pressure. The pressure of hydrogen gas is 751 mmHg - 26.8 mmHg = 724.2 mmHg.

Next, we convert the pressure of hydrogen gas from mmHg to atm by dividing by 760 mmHg/atm, giving us 0.953 atm.

Using the ideal gas law equation PV = nRT, we can calculate the number of moles of hydrogen gas. The volume of hydrogen gas is given as 37.3 mL, which we convert to liters by dividing by 1000 mL/L, giving us 0.0373 L. The temperature is given as 27°C, which we convert to Kelvin by adding 273.15, giving us 300.15 K. The ideal gas constant R is 0.0821 L∙atm/(mol∙K).

Plugging the values into the ideal gas law equation, we can solve for the number of moles of hydrogen gas: (0.953 atm) * (0.0373 L) = n * (0.0821 L∙atm/(mol∙K)) * (300.15 K).

Simplifying the equation, we find that the number of moles of hydrogen gas is approximately 0.00139 moles.

Since the balanced chemical equation between aluminum and hydrochloric acid is 2Al + 6HCl → 2AlCl₃ + 3H₂, we can conclude that 2 moles of aluminum react to produce 3 moles of hydrogen gas.

Using this ratio, we can calculate the number of moles of aluminum that reacted: (0.00139 mol H₂) * (2 mol Al / 3 mol H₂) = 0.000926 moles Al.

Finally, we can convert moles of aluminum to grams using the molar mass of aluminum (26.98 g/mol): (0.000926 mol Al) * (26.98 g/mol) ≈ 0.069 g Al.

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The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

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Answer: 9.8 meters per second

Explanation:

Answer:

MARK AS THE BRAINLIEST ANSWER

Explanation:

BRAINLIEST

The depth range of the epilimnion in this lake is most likely a. 0 to 3 meters. Option A is correct.

To determine the depth range of the epilimnion, we need to identify the layer of the lake where the temperature change is most rapid, which indicates the transition between the warm surface layer and the colder deep layer.

Looking at the temperature readings, we can see that there is a significant temperature difference between the surface layer (0-3 meters) and the layer below (4-7 meters).

However, the temperature change between 4-7 meters and 8-12 meters is not as dramatic, indicating that the transition between the warm surface layer and the colder deep layer occurs somewhere between 3 and 8 meters.

Hence, A. 0 to 3 is the correct option.

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Answer:

An alkaline solution can be formed when a metal oxide is dissolved in water. An acidic solution can be formed when a non-metal oxide is dissolved in water. For example, magnesium oxide dissolves to form alkaline solutions.

Answer:

Yes

Explanation:

Alkenes are relatively stable compounds, but are more reactive than alkanes because of the reactivity of the carbon–carbon π-bond. Most reactions of alkenes involve additions to this π bond, forming new single bonds.

Exothermic reactions, release exceeding chemical energy from the reactants. Before its release, the energy is turned into another form, heat or light. C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

An exothermic reaction is the chemical reaction that releases energy as heat or light when the reactants turn into products.

Reactant molecules have more energy than the product molecules, and hence, the remaining energy must leave the system. So part of the chemical energy from the reactants is released as another type of energy  (heat or light).

Usually, oxidation reactions are exothermic.

The correct option is C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

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Answer:

No, thermal energy is not being transferred by radiation.  The eggs are in direct contact with the metal pan, which is in direct contact with the gas flame, so this is conduction, not radiation. Radiation transfers thermal energy by electromagnetic waves, not by direct contact.

Answer:

no

Explanation:

a metal pan is cooking the eggs because the flame is touching the pan and the molecules are colliding with each other

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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Answer:

Beryllium-8 (8Be, Be-8) is a radionuclide with 4 neutrons and 4 protons. It is an unbound resonance and nominally an isotope of beryllium. It decays into two alpha particles with a half-life on the order of 10−16 seconds; this has important ramifications in stellar nucleosynthesis as it creates a bottleneck in the creation of heavier chemical elements. The properties of 8Be have also led to speculation on the fine tuning of the Universe, and theoretical investigations on cosmological evolution had 8Be been stable.

Explanation:

The hybridization of nitrogen atom in the HNO2 molecule is sp2. This is because in HNO2 molecule, nitrogen is bonded to two atoms of oxygen and a hydrogen atom. These atoms are arranged in a trigonal planar geometry around the nitrogen atom which has three electron domains. This type of hybridization occurs when one s orbital and two p

orbitals hybridize together to form three sp2 hybrid orbitals. The fourth p orbital remains unhybridized and contains a lone pair of electrons. Therefore, the hybridization of nitrogen in the HNO2 molecule is sp2.To determine the

concentration of HNO3(aq) in the resulting solution, the student titrates a 100. mL sample of the solution with 0.100 M KOH(aq). The neutralization reaction is given as below:HNO2(aq) + OH-(aq) → NO2 (aq) + H2OThe balanced chemical

equation shows that one mole of KOH reacts with one mole of HNO2.

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