Explain how a skateboard resting on the ground contains energy. If the skateboard were moving , would it have more energy than it did at rest? Explain.

Answer:

AIDS is acquired immuno deficiency syndrome caused by the HIV (human immunodeficiency virus). The government has raised the following awareness campaign on AIDS:

Government provides proper health care to the individual suffering from AIDS.

The government raises the awareness and the importance of the HIV test.

The government provides drugs to the people that are effective against the HIV.

Answer: was rejected by religious society and the church

Explanation:

At first, heliocentric theory was rejected by the Church and the religious public. Despite large amounts of evidence supporting the theory, the Catholic church prohibited scientists from teaching it as anything more than a hypothesis

Answer:

 D)  sublimation.

Explanation:

took the test

Sublimation is the transition of a solid directly to gas. it can be seen as temperature moves to the right at very very low pressures.

It is a physical change when cream mixes with coffee, it changes the color of the coffee. When you add more or less cream there is a color change depending on the consistency of cream. The properties are not changes and a no new compound is formed as in chemical change with a reaction of two compounds, a new compound is formed with different properties. So it is a physical change.

Final answer:

To convert 12.3 square yards of carpeting to square feet, multiply by 9, as there are 9 square feet per square yard, resulting in an area of 110.7 ft².

Explanation:

To calculate the area of the floor in square feet (ft²) given that the area is 12.3 square yards, we need to use the conversion between yards and feet. One square yard is equal to nine square feet, as 1 yard is equivalent to 3 feet and this conversion applies in both dimensions of area. Hence, to convert square yards to square feet, you multiply the square yards by the square feet equivalent of one square yard:

12.3 yd² × (9 ft²/1 yd²) = 12.3 × 9 ft²

The area of the carpeting required in square feet is therefore:

12.3 × 9 = 110.7 ft²

To calculate the pressure of CO2 in the wine bottle, you can use the ideal gas law equation PV = nRT. Convert the volume of ethanol produced to the volume of CO2 using stoichiometry. Take into account that the assumption that CO2 is insoluble in H2O is incorrect.

The pressure of CO2 inside the wine bottle can be calculated using the ideal gas law equation PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. To calculate the number of moles of CO2 produced, you need to convert the volume of ethanol produced to the volume of CO2 using stoichiometry. Finally, you can calculate the pressure of CO2 using the equation.

The density of ethanol is given as 0.79 g/cm3, so you can convert the volume of ethanol to its mass. The volume of CO2 produced is twice the volume of ethanol produced. From the information given, you can calculate the number of moles of CO2 produced. Then, you can convert the temperature in Celsius to Kelvin and use the ideal gas law equation to calculate the pressure of CO2 inside the wine bottle at 29°C.

Remember that the assumption made in the question that CO2 is insoluble in H2O is incorrect. In reality, it dissolves to some extent in water, which affects the pressure calculation.

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Answer:

Covalent Bonds

Explanation:

Got it right on Odessyware ;) Have a nice day!!!

Final answer:

When 2.00 moles of methane (CH₄) reacts with chlorine (Cl₂), according to the balanced chemical equation, the total amount of hydrogen chloride (HCl) produced is 8 moles.

Explanation:

The student is inquiring about the reaction between methane (CH₄) and chlorine (Cl₂) to produce carbon tetrachloride (CCl₄) and hydrogen chloride (HCl). We are given that 2.00 moles of methane react and asked to calculate the total amount of HCl produced, assuming that chlorine and hydrogen fluoride are present in excess.

First, we need to balance the chemical equation to understand the stoichiometry of the reaction:

CH₄ + 4 Cl₂ → CCl₄ + 4 HCl

From the balanced equation, we see that 1 mole of CH₄ reacts with 4 moles of Cl₂ and produces 4 moles of HCl. Therefore, if 2.00 moles of CH₄ reacts, it will produce:

mol HCl produced = 2 mol CH₄ × (4 mol HCl / 1 mol CH₄) = 8 moles of HCl

Elements in the periodic table with similar properties are found within the same group or vertical column, based on the periodic law which links properties to atomic numbers. Examples include alkali metals and halogens.

In the periodic table, elements that typically have similar properties are grouped together in the same column or group. This is based on the periodic law, which states that the properties of the elements are periodic functions of their atomic numbers. For example, elements in the same vertical group have similar chemical behavior because they have the same number and distribution of electrons in their valence shells. This can be observed as you move down a group, with variations in characteristics such as atomic size, ionization energy, and electron affinity.

An example of this is the alkali metals in group 1, which all exhibit similar chemical properties. They are very reactive, especially with water, and tend to lose their single valence electron in chemical reactions. Similarly, halogens in group 17 also share properties, such as seven valence electrons and high electronegativity.

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The 5p subshell of an atom can contain electrons with six different sets of quantum numbers, corresponding to pairs of electrons in each of the subshell's three p orbitals. These sets of quantum numbers are: {5,1,-1,-1/2}, {5,1,-1,+1/2}, {5,1,0,-1/2}, {5,1,0,+1/2}, {5,1,1,-1/2}, {5,1,1,+1/2}.

The 5p subshell of an atom can have electrons with a range of possible quantum numbers. A quantum number is a value assigned to describe the state of an electron in an atom. The 5p subshell has 3 orbitals, so it can contain up to 6 electrons.

When it comes to identifying the quantum number sets, the principal quantum number (n) will always be 5, representing the energy level. The azimuthal quantum number (l), which indicates the shape of the orbital, will be 1, representing a p-subshell. The magnetic quantum number (ml) can be -1, 0, 1, as there are 3 orbitals in a p-subshell. Finally, the spin quantum number (ms) can be -1/2 or +1/2, which indicates the spin orientation of an electron.

Therefore, all possible sets of quantum numbers for the electrons located in the orbitals of the 5p subshell are: {5,1,-1,-1/2}, {5,1,-1,+1/2}, {5,1,0,-1/2}, {5,1,0,+1/2}, {5,1,1,-1/2}, {5,1,1,+1/2}.

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The chemical formula of methane is CH₄.

This means that a single molecule of methane consists of one carbon atom (C) and four hydrogen atoms (H). It is the simplest alkane and a major component of natural gas. Methane's structure can also be represented by a Lewis structure where the carbon atom forms covalent bonds with four hydrogen atoms.

The neutral 41Ca atom has 20 protons, 21 neutrons, and 20 electrons. The atomic number of Calcium is 20 which represents the number of protons and also the electrons in the neutral atom. To determine the number of neutrons, we subtract the number of protons from the total mass number, getting 21 neutrons.

The symbol 41Ca for Calcium represents an isotope of Calcium. The number before the symbol, 41, is the mass number, which is the sum of protons and neutrons. The atomic number of Calcium (Ca), which represents the number of protons is 20 (from the periodic table). This doesn't change irrespective of the isotope. As it is a neutral atom, the number of electrons is equal to the number of protons, again 20.

To calculate the number of neutrons in this isotope, we subtract the number of protons from the mass number. So the number of neutrons = 41 - 20 = 21 neutrons.  

In conclusion, the neutral 41Ca atom has 20 protons, 21 neutrons, and 20 electrons.

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The mass of a liquid density of 3.2 g/ml and a volume of 25 ml will be 80gm.

The density of a material is the measure of how tightly it is packed together. It is expressed as mass per unit volume. Density Symbol: D.

Density Formula:

d = m/V

Where d is the density, m is the object's mass, and V is the object's volume.

Three of an object's most fundamental properties are mass, volume, and density.

Mass describes how heavy something is, volume describes its size, and density is defined as mass divided by volume.

Although mass and volume are everyday concepts, the concept of density is less obvious and requires careful consideration.

Here it is given that

Density = 3.2g/ml.

Volume = 25 ml.

Mass = ?

Density = mass/volume.

Mass = density x volume.

Mass = 3.2 x 25.

Mass = 80gm.

Thus, the mass of the substance is 80gm.

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yea the answer is true

The atomic numbers of the as yet undiscovered next two members of the series are 118 and 168.

The noble gases is a group of chemical elements with similar properties such as under standard conditions they are all odorless, colorless, monatomic gases with very low chemical reactivity.

The heaviest known noble gas metal is radon, atomic number 86. Where The outermost shell configuration of radon is [tex]6s^2 6p^6[/tex]

Electronic configuration of the next noble gas is:

[tex][Rn]5f^14 6d^{10} 7s^2 7p^6[/tex]

Therefore, atomic number of the noble gas after Rn is 86+32 = 118

The atomic number is the number of protons found in the nucleus of every atom of that element.

Electronic configuration of still the next noble gas can be obtained by adding  [tex]5g^18 6f^{14} 7d^{10} 8s^2 8p^6[/tex], which means 50 more electrons.

So the atomic number = 118 + 50 = 168

Therefore the atomic numbers of the as yet undiscovered next two members of the series are 118 and 168.

Grade:  9

Subject:  Chemistry

Chapter:  the atomic numbers

Keywords: the atomic numbers, radon, Electronic configuration, electrons, the noble gas