Mixtures are made up of what substances.

Answer:

It's explained by nebular theory, which describes the forces and processes at play as a nebula spins and accretes into a star and its planets orbiting it. A key piece of information to always keep in mind is that the force of gravity is responsible for accretion and all the objects it forms.

Explanation:

I hope this helps my mom helped me with this question too

Answer:

I believe it's the chemical composition of the fuel and different fluids such as the coolant of the radiator

Explanation:

Chemists may discover more sustainable compounds that produce less waste material or that release more energy for the least amount of fuel. For coolants, fluids with greater heat retention that can absorb heat and direct it to the radiator in the most efficient manner. This is usually paired with engineering.

creativity is the very element in science that helps us understand things. if we didn't have creative minds, we would never conduct experiments that help us discover things.

hope this helps, good luck!:)

Answer:

V = 21.2 cm³

Explanation:

Given data:

Diameter of block = 3.0 cm

Volume of block = ?

Solution:

Formula:

V = 2πr³

First of all we will calculate the radius from diameter.

r = d/2

r = 3.0 cm/2

r = 1.5cm

V = 2(22/7) (1.5cm)³

V = 2(3.14) (3.375cm³)

V = 21.2 cm³

Answer:

Thermal Energy is a certain type of energy that Heats.

Explanation:

"Thermal" is derived from "Thermo" which means heat.

Answer:

Rocks get older as we go away from the Mid Atlantic Ridge  towards the continents

Explanation:

As the plates move away from each other, new ocean lithosphere is created at the ridge. This also widens the ocean basin and leads to sea floor spreading.

The rock of the ocean floor are symmetrically aligned and they get become older as they move away from the crest of the ridge.

Thus, rocks get older as we go away from the Mid Atlantic Ridge  towards the continents

Answer:

B

Explanation:

We are given that ammonia can be produced from hydrogen gas and nitrogen gas according to the equation:

\(\displaystyle 3\text{H$_2$} + \text{N$_2$} \longrightarrow 2\text{NH$_3$}\)

We want to determine the mass of hydrogen gas that must have reacted if 0.575 g of NH₃ was produced.

To do so, we can convert from grams of NH₃ to moles of NH₃, moles of NH₃ to moles of H₂, and moles of H₂ to grams of H₂.

We are given that the molar masses of NH₃ and H₂ are 17.03 g/mol and 2.0158 g/mol, respectively.

From the equation, we can see that two moles of NH₃ is produced from every three moles of H₂.

With the initial value, perform dimensional analysis:

\(\displaystyle \begin{aligned} 0.575\text{ g NH$_3$}& \cdot \frac{1\text{ mol NH$_3$}}{17.03\text{ g NH$_3$}} \cdot\frac{3\text{ mol H$_2$}}{2\text{ mol NH$_3$}} \cdot \frac{2.0158\text{ g H$_2$}}{1\text{ mol H$_2$}} \\ \\ & = 0.102\text{ g H$_2$}\end{aligned}\)

*Assuming 100% efficiency.

Our final answer should have three significant figures. (The first term has three, the second term has four (the one is exact), the third term is exact, and the fourth term has five. Hence, the product should have only three.)

In conclusion, our answer is B.

Answer:

Explanation:

The question requires us to calculate the volume (in L) of a gas under the conditions given.

The following information was provided by the question:

Initial volume of gas = V1 = 2.00 L

Initial temperature of gas = T1 = 25.0 °C

Initial pressure of gas = P1 = 1.08 atm

Final temperature of gas = T2 = 100 °C

Final pressure of gas = P2 = 1.50 atm

To solve this problem, we'll need to apply the equation of ideal gases (shown below) twice: first, to determine the number of moles of gas, and again to calculate the volume of gas under the final conditions. Note that we'll determine the number of moles of gas under the initial conditions because this amount won't change (as we're talking about the same sample of gas).

Answer:

Anything below 7.0 is acidic, and anything above 7.0 is alkaline, or basic. pH scale, ranging from 0 (very acidic) to 14 (very basic/alkaline) and listing the pH values of common substances.

Explanation:

PRESS THE CROWN

The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

Explanation:

Answer:

29%

Explanation:

1.99 / ( 1.99 + 4.88)  x 100% = ~ 29%

The given redox reaction is:

Cr2O7^2- + C2H4O → C2H4O2 + Cr3+

To balance this reaction, we first balance the oxygen atoms by adding H2O on the right side of the equation. The number of H2O molecules added depends on the number of oxygen atoms needed. In this case, we need three O atoms on the right side, so we add three H2O molecules to the right side of the equation:

Cr2O7^2- + C2H4O → C2H4O2 + Cr3+ + 3H2O

Next, we balance the hydrogen atoms by adding H+ ions on the left side of the equation. The number of H+ ions added depends on the number of hydrogen atoms needed. In this case, we need eight H atoms on the left side, so we add eight H+ ions to the left side of the equation:

Cr2O7^2- + C2H4O + 8H+ → C2H4O2 + Cr3+ + 3H2O

Finally, we balance the charge by adding electrons. The number of electrons added depends on the difference in charge on the left and right side of the equation. In this case, the left side has a charge of -2 (from the Cr2O7^2- ion), while the right side has a charge of +3 (from the Cr3+ ion). This means that we need to add 5 electrons to the left side of the equation to balance the charge:

Cr2O7^2- + C2H4O + 8H+ + 5e- → C2H4O2 + Cr3+ + 3H2O

Therefore, the coefficient for water molecules in the balanced version of the given redox reaction is 3.

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Answer:

Here are the answers:

7. phosphorus molybdenum diboride

8. barium phosphite

9.  sulfur molybdenum

10.  dibromine heptoxide

11.   tribromine phosphide

12.  phosphorus tetrasulfide

the density of the oxygen gas sample is 1.123 g/L. The density of a gas can be calculated using the ideal gas law equation: Density = (Molar mass * Pressure) / (Gas constant * Temperature) In this case, we are given that the density of oxygen gas is g/L. We also know the pressure is 0.893 atm and the temperature is 41 °C.

To convert Celsius to Kelvin, we add 273.15 to the Celsius temperature. So, the temperature in Kelvin is 41 + 273.15 = 314.15 K. Now, let's solve the equation for density using the given values Density = (Molar mass * Pressure) / (Gas constant * Temperature) To use the ideal gas law equation, we need to convert the temperature to Kelvin.


Since the molar mass of oxygen is 32 g/mol and the gas constant is 0.0821 L·atm/(mol·K), we can substitute these values into the equation g/L = (32 g/mol * 0.893 atm) / (0.0821 L·atm/(mol·K) * 314.15 K) Now, we can calculate the density by simplifying the equation.

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The boiling point of the solution will be elevated by 0.284 °C, and the freezing point of the solution will be depressed by 1.029 °C.

Given information:

Mass of glucose = 50.0 g

Mass of water = 500.0 g

For boiling point elevation:

ΔTb = Kb × m

For freezing point depression:

ΔTf = Kf × m

Where:

ΔTb = boiling point elevation

ΔTf = freezing point depression

Kb = molal boiling point elevation constant

Kf = molal freezing point depression constant

m = molality of the solution

Molar mass of glucose = 6(12.01 g/mol) + 12(1.01 g/mol) + 6(16.00 g/mol) = 180.18 g/mol

Number of moles of glucose = mass / molar mass

n(glucose) = 50.0 g / 180.18 g/mol

Number of moles of water = mass / molar mass

n(water) = 500.0 g / 18.015 g/mol

Molality (m) = moles of solute/kilograms of solvent

m = n(glucose) / (mass(water) / 1000)

m = (n(glucose) / n(water)) × 1000

Boiling point elevation (ΔTb) = Kb×m

Freezing point depression (ΔTf) = Kf×m

Substitute the values:

ΔTb = 0.512 °C/m × m

ΔTf = 1.86 °C/m × m

ΔTb = 0.512°C/m × ((n(glucose) / n(water)) × 1000)

ΔTf = 1.86°C/m × ((n(glucose) / n(water)) × 1000)

Boiling point elevation = 0.512 °C/m × 0.554 mol/kg

= 0.284 °C

Freezing point depression = 1.86 °C/m × 0.554 mol/kg

= 1.029 °C

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Aluminum has been studied as a potential factor linked to Alzheimer's disease . Option (A) is correct.

Numerous studies have been conducted to investigate the connection between aluminum exposure and the development of Alzheimer's disease, a neurodegenerative disorder characterized by memory loss and cognitive decline. Although no conclusive evidence has been found to establish a direct causal relationship between aluminum and Alzheimer's disease, some studies suggest that high aluminum levels in the brain may contribute to the formation of beta-amyloid plaques, which are characteristic of Alzheimer's disease.

However, aluminum has not been found to be linked to chronic renal disease (B), low blood pressure (C), or melanosis of the skin (D). These conditions have different causes and risk factors that are unrelated to aluminum exposure. Therefore, the correct answer is E. None of the above.

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CH3Br. The CH3Br has the smallest dipole moment among the given molecules, and dipole-dipole forces depend on the magnitude of the dipole moment. Therefore, CH3Br will have the smallest dipole-dipole forces. H2O and ClBr have larger dipole moments compared to CH3Br

CH3Br. The explanation is that CH3Br has the smallest dipole moment among the given molecules, and dipole-dipole forces depend on the magnitude of the dipole moment. Therefore, CH3Br will have the smallest dipole-dipole forces. H2O and ClBr have larger dipole moments compared to CH3Br, while ClBrCl has the largest dipole moment among the given molecules.
The main answer is that CH3Br has the smallest dipole-dipole forces.
Dipole-dipole forces occur between polar molecules. The strength of these forces is determined by the difference in electronegativity between the atoms involved in the bond. The greater the difference in electronegativity, the stronger the dipole-dipole forces.

Comparing the given molecules:

1. CH3Br: Carbon (C) and Bromine (Br) have an electronegativity difference of approximately 0.5.
2. H2O: Hydrogen (H) and Oxygen (O) have an electronegativity difference of approximately 1.4.
3. HCl: Hydrogen (H) and Chlorine (Cl) have an electronegativity difference of approximately 0.9.
4. BrCl: Bromine (Br) and Chlorine (Cl) have an electronegativity difference of approximately 0.2.

CH3Br has the smallest dipole-dipole forces among these molecules, as it has a relatively low electronegativity difference between the atoms involved in the bond.

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Answer:D

Explanation:

Answer:

D

Explanation:

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.

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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

A myelin sheath is most like the insulation around an electrical wire.

The myelin sheath is a protective layer that surrounds and insulates the axon of a nerve cell. It is composed of fatty substances called lipids, specifically phospholipids and proteins. The myelin sheath acts as an insulating layer, similar to the insulation found around electrical wires.

Just as the insulation around an electrical wire prevents the leakage of electrical current and enhances the conduction of electrical signals, the myelin sheath serves a similar function in nerve cells. It helps to increase the speed and efficiency of nerve impulse transmission along the axon.

The myelin sheath is not continuous along the entire length of the axon. Instead, it is segmented with small gaps called nodes of Ranvier. These nodes allow for saltatory conduction, where the electrical impulses jump from one node to another, significantly increasing the speed of signal transmission.

Overall, the analogy of a myelin sheath being similar to the insulation around an electrical wire helps to understand its function in protecting and facilitating efficient signal conduction in nerve cells.

In conclusion, the myelin sheath is most like the insulation around an electrical wire as it provides protection and facilitates the conduction of electrical impulses along the axon of a nerve cell.

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During the polymerization of styrene to form polystyrene, the bonding and hybridization of the carbon atoms undergo significant changes.

In styrene, the carbon atoms are originally sp2 hybridized and form a conjugated system of double bonds in the aromatic ring. However, during the polymerization process, the double bonds in styrene undergo addition polymerization.As a result, the carbon atoms in polystyrene undergo a transformation in hybridization from sp2 to sp3. The double bonds break, and new sigma bonds are formed between the carbon atoms, leading to the formation of a long chain of repeating units.

This change in hybridization allows the carbon atoms in polystyrene to form stronger and more stable sigma bonds with neighboring carbon atoms or other substituents. Consequently, the structure of polystyrene becomes a three-dimensional network of carbon-carbon bonds throughout the polymer chainThe transition from an aromatic, conjugated system in styrene to a saturated, three-dimensional polymer structure in polystyrene is vital in the polymerization process, providing the desired properties and structural integrity to the resulting polymer.

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Answer:

B changing states of matter (solid to liquid)

Answer:

Molar mass of C3H8 = C 3 (12.01 g/mol) = 36.03 (g/mol)

H 8 (1.008 g/mol) = 8.064 (g/mol)

44.09 (g/mol)

74.6 g propane x 1 mole propane x 6.022 x 10

23

molecules

44.09 g propane 1 mole propane

= 1.02 x 10

24 molecules propane

Explanation:

Answer:

It is Noble-gas notation

Explanation:

Just did it on Edgenuity 2020

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the given electronic configuration represents noble-gas notation​.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The atomic number of argon is 18. The electronic configuration of argon is (Ne) 3s² 3p⁶. 1,2,3 represents the number of shells and s and represents the orbitals. The superscripts represents the number of electrons in each orbitals. The given electronic configuration represents  noble-gas notation​.

Therefore, the given electronic configuration represents noble-gas notation​.

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The number of moles in container 2 is 33.3moles when the container has 27.32L of gas inside it

The number of moles of gas in container 2 can be calculated using the Ideal Gas Law:  

n = PV/RT  

where n is the number of moles of the gas with known volume,

P is the pressure (assumed to be 1 atm for ideal gases),

V is the volume (27.32 liters),

R is the ideal gas constant (0.0821 L·atm/mol·K) and

T is the temperature (assumed to be 273.15 K).  

Plugging in the values, we get:  

n = (1 atm)(27.32 L)/(0.0821 L·atm/mol·K)(273.15 K)

n = 33.3 mol  

Therefore, there are 33.3 moles of gas in container 2.

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Answer:

Ionic

Explanation:

Main distinction between ionic and covalent bonding

What is the main distinction between ionic and covalent bonding? Electrons aren't equally shared in an ionic bond. The electronegativity difference is closer to zero in a covalent bond. ... If the difference is large, the bond is ionic.

The symbol for potassium is K, not P. The symbols for the other elements listed are correct: calcium is Ca, manganese is Mn, gold is Au, and chromium is Cr. The correct answer is C) potassium, P.

Chemical elements are typically represented by a symbol, which is a one or two-letter abbreviation used to identify the element in the periodic table, chemical equations, and other contexts. These symbols are usually derived from the name of the element, often in Latin or Greek.

In this question, all of the answer choices are names of chemical elements except for option C, which lists "potassium, P". Potassium is indeed an element, but its symbol is K, not P. Therefore, option C is the incorrect name, symbol combination.

To clarify the other options, calcium is represented by the symbol Ca, manganese by Mn, gold by Au, and chromium by Cr, and those symbol-element pairs are all correct.

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Answer:

The answer is "all the cells are too small, which is not seen by the naked eye, that's why we use a microscope to see it".

Explanation:

In the given question the choices were missing so, we define the correct answer only.

Cells are the essential building blocks of all living entities. There will be trillions of cells within the body. They construct a body shape, absorb nutrients, transform them into energy, and conduct specialized features.  

It provides stability and guidance, encourages mitotic cell development, encourages active and passive transfer, generates energy, induces metabolic processes, and contraceptive support.

9.45 g of C2H2 at STP occupies approximately 8.70 liters of volume.To calculate the volume occupied by 9.45 g of C2H2 (acetylene) at STP (standard temperature and pressure), we need to use the ideal gas law equation:PV = nRT

Where:

P = pressure (STP is 1 atm)

V = volume (what we need to find)

n = number of moles

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature (STP is 273.15 K)

First, we need to find the number of moles of C2H2:

Molar mass of C2H2 = (2 x 12.01 g/mol) + (2 x 1.01 g/mol) = 26.04 g/mol

Number of moles of C2H2 = 9.45 g / 26.04 g/mol = 0.362 mol

Now we can calculate the volume:

V = (nRT) / P

V = (0.362 mol x 0.0821 L·atm/(mol·K) x 273.15 K) / 1 atm

V = 8.70 L

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The value of "n" in the hydrate formula CuSO4 * nH2O is 5.

To determine the value of "n," we need to calculate the molar ratio between the released water and the hydrate copper(II) sulfate.

First, we need to convert the mass of water released to moles. The molar mass of water (H2O) is approximately 18.015 g/mol. Therefore, 5.051 g of water is equal to 5.051 g / 18.015 g/mol ≈ 0.2804 mol.

Next, we calculate the molar ratio between water and copper(II) sulfate. The molar mass of copper(II) sulfate (CuSO4) is approximately 159.609 g/mol. From the balanced chemical equation, we know that one mole of copper(II) sulfate is associated with "n" moles of water.

Assuming that the molar ratio is 1:1 between CuSO4 and H2O, we can set up the following equation:

0.2804 mol H2O = 14.00 g CuSO4 * (1 mol H2O / (159.609 g CuSO4 * n))

By rearranging the equation, we can solve for "n":

n = 14.00 g CuSO4 / (159.609 g CuSO4/mol) = 0.0877 mol

Since "n" represents the number of water molecules, it must be a whole number. Therefore, the closest whole number to 0.0877 is 5.

Therefore, the value of "n" in the hydrate formula CuSO4 * nH2O is 5.

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