Which of the following substances is a liquid at room temperature?
A) CH₃CH₃
B) CH₃OH
C) CH₄
D) HCl
E) CF₄

Answer:

b

both objects will receive a certain amount of thermal energy and heat up

Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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Bond angles are important because they can affect the shape of a molecule, which in turn can influence the molecule's polarity, reactivity, and other properties.

1. sp2 hybrid orbitals: The bond angle in sp2 hybridization is approximately 120 degrees. This occurs in molecules with trigonal planar geometry, such as ethene (C2H4).

2. sp3 hybrid orbitals: In sp3 hybridization, the bond angle is approximately 109.5 degrees. This is observed in molecules with tetrahedral geometry, such as methane (CH4).

3. sp3d hybrid orbitals: For sp3d hybridization, two bond angles are typically observed: 90 degrees and 120 degrees. This is found in molecules with trigonal bipyramidal geometry, like phosphorus pentachloride (PCl5).

Bond angle is the angle between two covalent bonds that share a common atom. In other words, it is the angle formed by the atomic nuclei of three adjacent atoms. Bond angles are important because they affect the molecular shape and determine many of the physical and chemical properties of a molecule.

Bond angles are determined by a variety of factors, including the number of atoms bonded to the central atom, the number of lone pairs on the central atom, and the electronic structure of the molecule. For example, in a molecule of water (H2O), the bond angle between the two hydrogen atoms and the oxygen atom is approximately 104.5 degrees.

This bond angle is determined by the tetrahedral electron-pair geometry of the oxygen atom, which has two bonding pairs and two lone pairs of electrons.Bond angles can vary widely depending on the type of molecule and the specific arrangement of atoms. For example, in a molecule of methane (CH4), the bond angle between each of the four hydrogen atoms and the carbon atom is approximately 109.5 degrees.

In general, bond angles are important because they can affect the shape of a molecule, which in turn can influence the molecule's polarity, reactivity, and other properties. Understanding the bond angles in a molecule is essential for predicting its behavior and for designing new molecules with specific properties.

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Explanation:

the physical and chemical properties of an element are periodic functions of their atomic number.

Answer:modern periodic table is published by Henry Moseley and he believes that ' properties of an elements are periodic function of the atomic number' and he classify the periodic table by groups and perieods so in the modern periodic table there are seven periods and eighteen groups.

By using given equation 0.9 moles of CH₄ are required to produce 3.6 moles of HCl.

The transformation of one or more reactants, also known as reactants, into one or more new products, also known as products, occurs during a chemical reaction.

Chemical reactions turn reactants into products by involving reactants in the process. As an illustration, when we breathe, oxygen is inhaled, and upon coming into contact with glucose, it reacts to create carbon dioxide, water, and energy.

Given chemical reaction:

CH₄ + 2 Cl₂ → 4 HCl + C

1 mole of CH₄ gives 4 moles of HCl

x moles of CH₄ gives 3.6 moles

x moles of CH₄ = 3.6/4

x moles of CH₄ = 0.9moles.

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Answer:

The density is 33.4

Explanation:

mark as brianlest

Answer:

See below:

Explanation:

Hello! My name is Galaxy and I will be helping you today. I hope you are having a nice day.

There are 3 main ways to measure temperatures, you have Celsius, Fahrenheit, and Kelvins.

Celsius and Fahrenheit are main ways to measure heat in non-scientific terms, althought they are used sometimes when needed.

Kelvins are used for Science as they are precise and can deal with temperatures that are super hot or super cold.

The lowest temperature in Kelvins is 0 degrees Kelvin, also known as Absolute Zero. There are no temperatures above that. So the answer to your question would be Kelvins.

After assigning electrons based on the Electronegativity value, determine how many (if any) lone pair electrons are on that atom, and add two values together.

The electronegativity of an element increases with oxidation state of the element.

oxidation numbers for covalent bonds:

Although covalent bonds donot result in charges, oxidation states are still useful.

They label hypothetical transfer of electrons if substance were ionic.

Determining oxidation states of atoms in a covalent molecule is very important when analyzing "redox" reactions

To determine Oxidation Number for a non-metal in covalent compounds or polyatomic is the difference between the Group Number and total number of electrons assigned to that atom.

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Predominant type of intermolecular force in each of the following compounds are :-

CHF3: polar; Dipole dipole forces

OF2: Polar; dipole dipole forces

HF: hydrogen bonding (H-F)

CF4: nonpolar; London/dispersion forces.

Intermolecular forces (IMF) (or secondary forces) are forces that mediate interactions between molecules. This includes attractive or repulsive electromagnetic forces acting between atoms and other types of neighboring particles. Eg.- atom or ion.

Intermolecular forces are weak compared to intramolecular forces, which are the forces that hold molecules together.

For example, covalent bonds, in which pairs of electrons are shared between atoms, are much stronger than the forces that exist between adjacent molecules. Both sets of forces are essential components of force fields commonly used in molecular mechanics.

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Answer:

7.022

Explanation:

2.589x10^6/ 3.687x10^5

1. 2.589/3.687 = 0.702197 [Separate out and divide just the decimal portion first]

2.  10^6/10^5 = 10^(6-5) = 10^1  [Divide the exponent portion next]  When dividing, subtract the denominator exponent from the numerator exponent:  (6-5) = 1.  The exponent is 1.

0.702197x10^1    [Put the two pieces together: 1. and 2.]

7.02197             [Move the decimal point once to the right, which will reduce 10^1 to 10^0, or 1]

The correct response to the problem in standard form is 7.023 * 10^0.

When a number is written in scientific notation, it has a base and an index. The number is multiplied by 10 raised to a given power.

In this case, we can see that the correct response to the problem in standard form is 7.023 * 10^0.

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The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

Rocks are of different types such as metamorphic, igneous, and sedimentary rocks.

Rocks that are more pliable, porous, or permeable weather more quickly than tougher rocks. Rocks weather more quickly in hot regions than in chilly ones.

In comparison to other rocks, rocks having minerals that break down slowly in water will weather more quickly. The rate of weathering increases with the amount of water present.

Therefore, The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

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Answer:A B

How many electrons are there in Florine with a -1 charge? 10

What is the total number of nucleons in helium? 4

What is the mass number of an element if it contains 19 protons, 19 electrons, and 20 protons? 39

What is the atomic number of an element with 7 protons, 10 electrons, and 7 neutrons? 7

Explanation:  Credit to GOOGLE

Answer:

5 hours

Explanation:

Given:

Distance = 275 km

Speed = 55 km/h

\(speed = \frac{distance}{time} \)

\(time = \frac{distance}{speed} \)

\(time = \frac{275}{55} \)

\(time = 5\)

Answer:

False, it's not an example of a resonance structure.

There are four kinds of chemically non-equivalent carbons in the active enantiomer of Ibuprofen.

Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that works by inhibiting the production of prostaglandins, which are responsible for inflammation, pain, and fever. The active enantiomer of ibuprofen has the chemical formula C13H18O2 and contains several different types of carbons, including sp3 hybridized carbons in the aliphatic chain and sp2 hybridized carbons in the aromatic ring.

To determine the number of chemically non-equivalent carbons in the molecule, we need to consider the different environments in which each carbon atom finds itself. This can be influenced by factors such as the surrounding atoms and functional groups, as well as the hybridization state of the carbon atom. In the case of the active enantiomer of ibuprofen, there are four different types of chemically non-equivalent carbons: the two methyl groups on the isobutyl chain (CH3), the methylene group adjacent to the chiral center (CH), the methylene group in the aromatic ring (CH), and the carbonyl carbon in the carboxylic acid group (C=O). Each of these carbons has a unique chemical environment, which makes them chemically non-equivalent.

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Answer:

1. 9600 moles

2. 4096 moles

Explanation:

CS2 + 3 O2=> CO2 + 2 SO2

1. The ratio for CS2: SO2 is :

1:2

If there are 75g of CS2 then there are:

75 × 2= 150g of SO2

Moles = mass × Mr

Moles = 150 × 64

Moles = 9600

2. The ratio for O2 : SO2 is:

3:2

If there are 96g of O2 then there are:

96 × 2/3 = 64g of SO2

moles = mass × Mr

Moles = 64 × 64

Moles = 4096

Answer:  The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound.

Explanation:

Answer:

The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds

The amount of heat required is 19219.2 J

Mass = mole × molar mass

Mass of nitrogen = 3 × 28

Mass of nitrogen = 84 g

Q = MCΔT

Q = 84 × 1.040 × 220

Q = 19219.2 J

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To find the new density of the brass cylinder hanging in salt water, you can use the concept of apparent weight. Apparent weight is the weight of an object when it is submerged in a fluid, and it is equal to the actual weight minus the buoyant force.                                                                                                                                                                            

The buoyant force is the force exerted by the fluid on the object, which is equal to the weight of the displaced fluid.
So, to find the new density of the brass cylinder, you would first measure its apparent weight when it is submerged in salt water. Then, you can use the equation for apparent weight to calculate the buoyant force and subtract it from the actual weight of the brass cylinder.
Once you have the actual weight and the apparent weight, you can use the equation for density to find the new density of the brass cylinder in salt water. Density is the mass per unit volume of an object, so you would need to measure the volume of the brass cylinder as well.Buoyant force can be found by calculating the weight of the displaced saltwater volume, which is equal to the volume of the submerged brass cylinder.

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The group of organs that work together to perform a specific function is called an organ system.

Answer:

3.45 x 10^5

Explanation:

The molecular solid that has the lowest boiling point is ; ( A ) One with induced dipole attractions

Induced dipole attraction is a weak dipole force of attraction that occurs whenever a polar molecule induces a dipole in a nonpolar substance thereby distablizing the electron arrangement previously present in the nonpolar substance.

Nonpolar Substances that undergoes induced dipole attraction will have its boiling point lowered due the electron arrangement destabilization it experiences.

Hence we can conclude that the molecular solid that has the lowest boiling point is One with induced dipole attractions.

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The mass (in grams) of aluminum hydroxide produced when 4.46 g of sodium hydroxide reacts is 2.90 grams

First, we shall obtain the balanced equation for the reaction. This is given below

3NaOH + Al → 3Na + Al(OH)₃

From the balanced equation above,

120 g of NaOH reacted to produce 78 g Al(OH)₃

With the above information, we shall determine the mass of Al(OH)₃ produced from 4.46 grams of NaOH. Details below:

From the balanced equation above,

120 g of NaOH reacted to produce 78 g Al(OH)₃

Therefore,

4.46 g of NaOH will react to produce = (4.46 × 78) / 120 = 2.90 g of Al(OH)₃

Thus, the mass of aluminum hydroxide, Al(OH)₃ produced is 2.90 g

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To determine the exact value of pK2 in this case, we can use the relationship between pH and pK, which states that the pH of a solution is equal to the pK of the acid with the lowest concentration when the acid and its conjugate base are in equilibrium.

Here, we know that the pH of the solution dropped from 8.00 to 3.20 after the addition of HCl. We can assume that the second group is now in the acid form since we know that the first ionizable group has a pK of 3.8, and the second group (pK2) is between 7 and 10, we can assume that the second group is now in the acid form.

We can use the relationship between pH and pK to calculate the exact value of pK2:

pH = pK2 = pKw / [H+] = 14.00 - log([H+])

3.20 = 14.00 - log([H+])

Solving for [H+], we find that [H+] = 1.0 x 10^-3.2

Now we can find the value of pK2 as:

pK2 = 14.00 - log(1.0 x 10^-3.2) = 14.00 - (-3.2) = 14.00 + 3.2 = 17.2

Therefore, the exact value of pK2 is 17.2.

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The empirical formula of the compound that is formed is PO3.

We have to note that the empirical formula can be said to be the simplest formula of the substance that is under consideration. In this case the question said that we have to find the empirical formula of the compound that is formed.

The mass of oxygen is 2.84−1.24 = 1.60g

                                                  P                           O

Combining mass                   1.24g                       1.60g

No. of moles of atoms -   1.24/31= 0.04                 1.60/16= 0.10

Ratio of moles                                1                         2.5

Thus the empirical formula of the compound is PO3

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Answer:

Mg(s) + 2H⁺(aq) ⟶ Mg²⁺(aq) + H₂(g)  

Explanation:

A net ionic equation shows all the ionic substances as ions and shows the correct state of each substance.

Magnesium react with hydrochloric acid according to the equation :

This demonstration can be used to illustrate the characteristics reactions of metals with acid , a single replacement reaction ,or to demonstrate the generation of hydrogen gas.

The founder of professional anthropology in the United States was Franz Boas.

Franz Boas is the founder of professional anthropology in the United States. He is known as the "Father of American Anthropology." Franz Boas was a German-born American anthropologist and a pioneer in modern anthropology.His work was pivotal in changing the way that anthropologists researched and understood human cultures.Boas was the first person to propose that each culture should be studied in its own context, rather than being compared to other cultures.

                               He also stressed the importance of fieldwork in anthropological research, believing that immersion in a culture was necessary to truly understand it. In addition to his research, Boas was also a mentor to many of the most important anthropologists of the 20th century.

                              He founded the first anthropology department in the United States at Columbia University and was the editor of the first journal of American anthropology.

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Answer:

Hydrophobic molecules and surfaces repel water. Hydrophobic liquids, such as oil, will separate from water. Hydrophobic molecules are usually nonpolar, meaning the atoms that make the molecule do not produce a static electric field.