the fuel tank of an automobile has a capacity of 14.8 gallons. if the density of gasoline is 42.0 lb/ft^3, what us the mass of fuel in kilograms when the tank is full?

The statement suggests a hypothetical correlation between giving teachers chocolate and a decrease in assigned homework. This could be tested experimentally, but it's important to remember other influences may effect the outcome.

The sentence 'If chocolate is given to teachers, then the amount of homework will decrease' is a hypothetical or conditional statement as it proposes a cause and effect relationship: the cause being 'chocolate is given to teachers' and the effect is 'the amount of homework will decrease'. This type of connection is common in hypothesis testing, where an idea is proposed and then evaluated through experimental or observational means.

For example, a study might be carried out in a school where half of the teachers are given chocolate and the other half are not. The amount of homework assigned by both groups could then compared to see if there is any noticeable difference. However, it is crucial to recognize that other factors outside of the experiment, such as the individual teaching style, the curriculum demands, and teacher's preference, could also impact the outcome.

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Answer:

A) nucleus, smaller

Explanation:

The structure of an atom can be explained based on Rutherford's model according to which, most of the mass of an atom is concentrated in its positively charged core called the 'nucleus' whereas the negatively charged electrons move around it in fixed paths called orbits. The radius of the nucleus however is much smaller than that on the atom.

An element is usually represented in terms of its atomic mass (A) and atomic number(Z).

Atomic mass = protons + neutrons

Atomic number = number of protons

Therefore, the __nucleus_______ contains the majority of the mass of the atom but is much _smaller_______ than the atom.

Answer:

C. NaCl

Explanation:

I hope this helps! :D

Answer:

D a ionic compound with properties different from magnesium or oxygen.

Explanation:

Sulfate and sulfide minerals are both inorganic and share similar crystal structures. Sulfates contain SO4^2- while sulfides contain S^2-. They differ in solubility, formation conditions, and typically found in different environments.

Sulfate and sulfide minerals are both types of minerals that contain sulfur. They are the same in that they are both inorganic solids with a definite chemical composition and crystalline structure, which means they have an orderly arrangement of atoms. The key differences between the two are based on their chemistry. Sulfate minerals contain the sulfate anion (SO42-), whereas sulfide minerals contain the sulfide anion (S2-). Sulfates typically form in oxidizing conditions and tend to be more soluble in water compared to sulfides, which are usually formed in reducing conditions and are generally less soluble in water. These characteristics influence the physical properties and formation environments of these minerals. For example, sulfate minerals, such as gypsum (CaSO4·2H2O), often occur in evaporative environments, while sulfide minerals, such as pyrite (FeS2), commonly form in reducing environments such as sedimentary layers with organic material or hydrothermal veins.

The eccentricity of Earth's orbit is a measure of its elliptical shape and is calculated using the distance to the foci and the semi-major axis of the orbit. Earth's orbital eccentricity is approximately 0.0167, indicating it is nearly circular with a slight elongation.

The eccentricity of Earth's orbit is a measure of its deviation from a perfect circle. The orbit of Earth is slightly elliptical, with an eccentricity that is generally known to be less than 0.1, which means it is very close to circular. To calculate the eccentricity (e), one can use the formula e = f/a, where f is the distance from the center of an ellipse to one of the foci, and a is half the long axis of the ellipse.

For Earth's orbit, we have an average semi-major axis of approximately 1.496 × 10¹ meters (the average distance from the Earth to the Sun) and specific calculations yield an eccentricity value of approximately 0.0167. This is indeed less than 0.1, confirming that Earth's orbit is nearly circular, but with a slight elongation.

The option involved in a scientific inquiry is coming up with questions based on observation and reasoning.Hence option (C) is correct.

Scientific inquiry have 2 functions : initial, to supply a descriptive account of however scientific inquiry is allotted in observe, and second, to supply associate instructive  account of why scientific inquiry succeeds additionally because it seems to try and do in inbound at real information.

Scientific inquiry refers to the ways that during which scientists study the flora and fauna and propose explanations supported proof derived from their work.

Scientists use 3 kinds of investigations to analysis and develop explanations for events within the nature: descriptive investigation, comparative investigation, and experimental investigation.

Therefore, The option involved in a scientific inquiry is coming up with questions based on observation and reasoning. Hence option (C) is correct.

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You may calculate a substance's density by dividing its mass by its volume. Given a mass of 25 g and a volume of 5 cm^3, the density of the substance would be 5 g/cm^3.

The density of a substance is calculated using the formula density = mass/volume. In this case, the mass of the substance is 25 grams and the volume is 5 cm3.

To calculate the density, we would dividing the mass by the volume, thus: density = 25 g / 5 cm3 = 5 g/cm3.

Therefore, the density of the substance is 5 g/cm3.

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Metals are placed on left side of periodic table and middle portion of it.Non-metals are placed on right side while the metalloids are along zig-zag line on right side of periodic table.

It is the tabular display of elements  which are discovered till date may it be natural or man -made.It provides a graphic representation of modern periodic law according to which elements are arranged in increasing order of their atomic numbers.

The table consists of seven horizontal rows called periods and 18 vertical columns called groups. The table has enabled classification of elements based on electronic configuration and atomic numbers.

The table is called periodic because the properties of elements repeat after regular intervals of atomic numbers.Hence ,elements with similar properties fall in same group of the periodic table.

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Answer: Option (B) is the correct answer.

Explanation:

Elements of same group tend to show similar chemical properties because elements of same group show same number of valence electrons.

Therefore, they have similar chemical properties.

For example, nitrogen and phosphorous are both group 15 elements and they show similar chemical properties.

Thus, we can conclude that because they are in the same family, we can predict about these elements that they are chemically reactive in a similar way.

The blank should be filled with "Magma". Magma is melted rock beneath the Earth's surface. When magma slowly cools underground, it forms intrusive igneous rocks.

Magma is a mixture of molten rock, minerals, and gases that forms beneath the Earth's surface. It originates from the partial melting of rocks in the Earth's mantle or crust due to high temperature and pressure conditions.

When magma rises towards the Earth's surface, it can solidify underground before reaching the surface. This process occurs when the magma cools slowly over a long period of time. As it cools, the minerals within the magma crystallize and solidify to form intrusive igneous rocks. Since this process happens below the surface, intrusive igneous rocks are also known as plutonic rocks.

Intrusive igneous rocks have a coarse-grained texture because the slow cooling allows sufficient time for large mineral crystals to form. Examples of intrusive igneous rocks include granite, diorite, and gabbro. These rocks can be exposed at the Earth's surface through uplift and erosion, revealing the once-buried formations.

Answer: 1.6221*10^23 atoms

Explanation:

Butane = C4H10

Molar mass = 58g/mol

1 mole of butane has 4 carbon atoms.

% of carbon in 1 mole of C4H10 = 4*12/58 =82.8%

Mass of carbon in 4g of butane = 82.8/100 *4 = 3.312g.

3.312g of carbon is equal to how many moles of carbon?

No.of moles = mass/ molar mass

3.312/12 = 0.276 moles.

Using Avogadro's number,

Number of atoms in any substance = Avogadro's constant * no of moles of that substance

(6.02214*10^23) * 0.276 = 1.6221*10^23 atoms.

Answer:

Several properties (listed in the explanation)

Explanation:

The volume and density of air change with changes in temperature, T.

There are several things that take place:

As the temperature of air increases:

1. the volume increases - The gas particles have more kinetic energy to move hence the increase in volume. The kinetic energy is directly related to temperature as the energy is derived from the energies of the particles

2. the density decreases- there is less mass of air per unit volume. The air particles are not closely bound together

As the temperature of air decreases:

1. The volume decreases - the air particles lose kinetic energy and are close together.

2. the density increases - there is more weight per unit volume due to lower kinetic energy.

The final volume of the gas at the given pressure and temperature is 944.1 mL.

The given parameters;

The final volume of the gas at the given pressure and temperature is calculated by applying Boyle's law;

[tex]P_1V_1 = P_2v_2\\\\V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{10 \times 405 }{4.29} \\\\V_2 = 944.1 \ mL[/tex]

Thus, the final volume of the gas at the given pressure and temperature is 944.1 mL.

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Final answer:

Using Boyle's Law, which relates to the pressure and volume of a gas under constant temperature, the gas originally at 405 mL and 10.0 atm, when subjected to 4.29 atm at the same temperature, will occupy a volume of approximately 945 mL.

Explanation:

The volume of a gas sample can be calculated under different conditions of pressure while keeping the temperature constant using Boyle's Law. Boyle's Law states that the volume of a given mass of gas is inversely proportional to its pressure when temperature remains constant, which can be expressed as P1V1 = P2V2, where P is the pressure and V is the volume of the gas at two different states (1 and 2).

In this scenario, the initial conditions are 405 mL volume at 10.0 atm, and we aim to find the volume at 4.29 atm at the same temperature. Using Boyle's Law:

10.0 atm * 405 mL = 4.29 atm * V2

Solving for V2, we find that V2 = (10.0 atm * 405 mL) / 4.29 atm, which equals approximately 945 mL.

Therefore, the gas will occupy a volume of 945 mL at 4.29 atm and the same temperature of 467 K.

The average atomic mass of a sample of naturally occurring element X, comprised of isotopes ^51X, ^52X, and ^56X with natural abundances of 47%, 17%, and 36%, is calculated to be 52.97 atomic mass units (amu).

The average atomic mass of a sample of naturally occurring X can be calculated by taking into account the natural abundance of its isotopes. To find the average atomic mass of element X, we multiply the mass number of each isotope by its respective natural abundance (converted to a fraction), and then add these values together.

For isotopes ^51X, ^52X, and ^56X with natural abundances of 47%, 17%, and 36%, respectively, we calculate the average atomic mass as follows:

Summing these products gives us:

23.97 amu + 8.84 amu + 20.16 amu = 52.97 amu

Therefore, the average atomic mass of naturally occurring X is 52.97 amu.

Answer:

Covalent Bonding

Explanation:

If atoms have similar electronegativities (the same affinity for electrons), covalent bonds are most likely to occur. Because both atoms have the same affinity for electrons and neither has a tendency to donate them, they share electrons in order to achieve octet configuration and become more stable.

The most effective method to separate oil and water is by using density differences with a separatory funnel. Distillation is also suitable but more complex. Filtration and separation by particle size are not appropriate for this mixture.

The student asked: Which method would be best to separate a mixture of oil and water?

The best method to separate a mixture of oil and water is separation by density. Since oil and water have different densities, the oil will float on top of the water. Using a separatory funnel, you can pour out the water from the bottom, leaving the oil behind.

Another method that could be used is distillation. Since water and oil have different boiling points, heating the mixture will allow the water to boil and be collected separately from the oil. However, this method is more complex and generally less practical for simple separation tasks.

Filtration and separation by particle size are not effective methods for this type of mixture because both oil and water are liquids and do not have different particle sizes or solid components that can be filtered.

Correct Question - Which method would be best to separate a mixture of oil and water?

This problem is very vague since no other details are given. However for the sake of calculation let us assume that the compound is an ideal gas at STP.

So that the molar volume is: 1 mole = 22.4 L

density = (44.01 g/mol) * (1 mol / 22.4 L) = 1.96 g/L = 1.96 kg/m^3

Answer:

CO2

Explanation:

Carbon has a mass of 12.011 on the periodic table

Oxygen has a mass of 15.999 on the periodic table.

Well, there's one carbon and two oxygens in the compound CO2, and when you complete 12.011+15.999(2), you get 44.01 g/mol

Answer:

CO2

Explanation:

Carbon has a mass of 12.011 on the periodic table

Oxygen has a mass of 15.999 on the periodic table.

Well, there's one carbon and two oxygens in the compound CO2, and when you complete 12.011+15.999(2), you get 44.01 g/mol