why are viruses referred to as being obligate parasites ?
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being able to be divided into big, thin layers FEEDBACK: A mineral must be divided into numerous, thick layers in order to be utilized as a window pane. supple, fragile layers

A mineral is an organic element or compound that occurs in nature and has a recognizable chemical composition, crystalline size, and physical characteristics. Silica, feldspar, mica, albite, olivine, and calcite are examples of common minerals.

A mineral is just a substance that occurs naturally having unique atomic structures, compositions, and chemical and physical properties. Rocks are often composed of two or even more minerals that have been mixed by geological processes.

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If 85.0 grams of Ca(OH)₂ are used in the reaction, the mass in grams of water would be produced is 20.67 g.

The correct option is not given.

The mass of water produced is determined as follows:

Equation of reaction:

Ca(OH)₂ ---> CaO + H₂O

The mole ratio of the reaction shows that 1 mole of Ca(OH)₂ decomposes to yield 1 mole of CaO and 1 mole of  H₂O.

Molar mass of Ca(OH)₂ = 74 g

Molar mass of H₂O = 18 g

74 g of Ca(OH)₂ decomposes to produce 18 g H₂O.

The mass of water produced from 85.0 grams of Ca(OH)₂ = 85 * 18/74

The mass of water produced from 85.0 grams of Ca(OH)₂ = 20.67 g

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Answer:

J/kg.oC

Explanation:

The unit of specific heat capacity of a substance is J/kg*°C (joule per kilogram-degree)

M1V1 = M2V2

where M1 and V1 are the molar concentration and volume of the stock solution, and M2 and V2 are the molar concentration and volume of the final solution. We can use this formula to find the volume of water that we need to add to the stock solution to prepare the final solution.

Plugging in the given values, we have:

15.406 M x V1 = 3.361 M x 372.510 mL

To solve for V1, we can divide both sides of the equation by 15.406 M:

V1 = 3.361 M x 372.510 mL / 15.406 M

V1 = 24.227 mL

Therefore, we need to add 24.227 mL of water to the stock solution of 15.406 M hydrochloric acid to prepare a solution with a hydrochloric acid molar concentration of 3.361 M and a volume of 372.510 mL.

For a gas at a fixed pressure and temperature, when the number of moles of gas is doubled, the volume of the gas will also double.

At a fixed pressure and temperature, the volume of a gas is directly proportional to the number of moles of gas present. This relationship is described by the Ideal Gas Law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

If the number of moles of gas is doubled, the volume of the gas will also double. This is because the pressure and temperature are fixed, and according to the Ideal Gas Law, the only variable that affects the volume of the gas is the number of moles present. The volume of the gas will increase proportionally with the number of moles, so if the number of moles is doubled, the volume will also double. This is only valid for ideal gases; for real gases, this relationship is not strictly observed.

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Periodic patterns and knowledge of valence electrons can be used to forecast an element's reactivity and behavior in a chemical bond in a variety of ways: Electronegativity.

An element's electronegativity reflects its capacity to attract electrons in a bond. High electronegativities elements, such as fluorine, are more reactive and form stronger bonds than low electronegativities elements, such as sodium. Ionization Energy: One element's ionization energy defines the amount of energy necessary to remove an electron from the element. High ionization energies elements, such as calcium, are less reactive and less prone to form covalent connections. Valence electrons: An element's reactivity is determined by the number of valence electrons it has. Elements with a small number of valence electrons.

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1) There is a new product on the right hand side

2) Magnesium and oxygen

3) The stoichiometric coefficient of the reactants

4) The number of atoms of each of the elements in the molecule

5) At the start of the reaction, the elements are isolated while at the end of the reaction, the elements are combined.

We have to note that when we talk about a chemical reaction we mean the combination of two or more substances so that we can be able to get a product that is different from the reactants.

in this case, we can see that the reaction that has taken place is the combination of the oxygen molecule and the magnesium atom so as to give the magnesium oxide compound.

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The free energy of the water is obtained as 90.7 kJ/mol. Option D

We have to note that the Hess law of the constant heat summation is the law that we can be able to use in this case so as to be able to obtain the standard free energy of the formation of the water.

We have to keep in mind that the standard free energy of the reaction can be obtained by;

Standard free energy of reaction = Standard free energy of product - Standard free energy of the reactants

Thus;

Let the standard free energy of water be X

-957.9  = [4( 86.71 ) + 6X] - [4(-16.66) + 5(0)]

957.9  =  (346.84 + 6X) - (-66.64)

957.9  = 280.2 + 6X

X =  90.7 kJ/mol

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Answer:

C4H8O2

Explanation:

The empirical formula is C2H4O1   [C/H/O is 2/4/1]

As written, the molar mass is (2*12) = 24, plus (4*1) = 4, plus (1*16) = 16, for a total of 44 grams/mole.  Two units of C2H4O1 would be 88 grams/mole, which is what is needed.

The molecular formula is C4H8O2.

Answer:

[tex]C_{4} H_{8} O_{2}[/tex]

Explanation:

Setting up ratio:

Carbon    :   Hydrogen  :  Oxygen

    2         :           4          :     1

As there are two carbon atoms, four hydrogen atoms and one oxygen atom,

therefore the formula becomes: [tex]C_{2} H_{4} O[/tex]

The Mr would be: (12 x 2) + 4 + 16

= 44 g/mol

Molecular formula:

[tex](C_{2} H_{4} O)_{n}[/tex]

n = 88/44

n = 2

Thus:

[tex](C_{2} H_{4} O)_{2}[/tex]

= [tex]C_{4} H_{8} O_{2}[/tex]

Answer:

6.55 g

Explanation:

The atomic mass of Carbon (C) is 12.0107, of Hydrogen (H) is 1.008, of Nitrogen(N) is 14.0067, and of Oxygen(O) is 15.9994

Therefore the molar mass of acetaminophen = 12.0107 + 4 * 1.008 + 14.0067 + 2 * 15.9994 = 151.16

mass of C in 99.0 g of acetaminophen = (99.0 g / 151.16 g/mol) * 1 mol C/ 1mol acetaminophen

mass of C in 99.0 g of acetaminophen = 6.545 g

Wash glassware in hot water or a glassware washer as soon as you're finished using it to avoid the formation of hard-to-remove residue. Corning recommends soaking glassware in water if it's impossible to wash it immediately after use

Any glass laboratory equipment is referred to as glassware. When you're through using a glass item, wipe it down to get rid of any cleaning agent.

Glass makes up a large portion of our scientific equipment, including measuring cylinders, conical flasks, and beakers. After use, these glasses need to be professionally cleaned.

Since they are frequently cleaned with a solvent, small particles of the cleaning agent stick to the glassware.

In order to avoid contaminating a sample placed in glassware, these cleaning solvent particles must be removed with a wipe.

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Coniferous trees differ from deciduous trees in that they produce cones as a mechanism of reproduction and have waxy, needle-shaped leaves to retain water. B and D are the appropriate choices as a result.

The blossoms on deciduous trees are big.

They are all over the planet, including oaks, maples, and beech trees.

Deciduous refers to something that falls off, and these trees lose their leaves every fall.

Deciduous trees typically have large, flat leaves.

Coniferous trees have tiny, waxy leaves that are often thin (needles or flat scales) and designed to hold onto water.

A tree that produces cones is referred to as a conifer. The most prevalent conifers are spruces, pines, and firs.

Evergreens and softwoods are other names for coniferous trees.

Broad leaves on deciduous trees turn color in the fall, and they use flowers to spread their seeds.

Coniferous trees don't change color in the fall, have needles instead of leaves, and use cones to disseminate their seeds rather than flowers.

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Complete Question -

2. How are coniferous trees different from deciduous trees? (Select all that apply.)

Conifers grow berries as a means of reproducing.

Conifers grow cones as a means of reproducing.

Conifers drop their leaves in colder seasons to conserve water.

Conifers have waxy, needle-shaped leaves to retain water.

Many pupils believe in error that plants solely engage in photosynthesis whereas only mammals engage in cellular respiration. They don't know that plants also undergo cellular respiration to generate ATP for cellular functioning.

Our lungs and respiratory system are necessary for breathing. They exhale carbon dioxide and inhale oxygen, which is referred to as inhalation, into our bodies (called expiration, or exhalation). The exchange between oxygen or dioxide occurs throughout breathing.

When assessing someone's respiration, it's critical to consider their breathing difficulties. When at rest, an adult in good health breaths 12 to 16 times each minute.

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The molarity of silver nitrate (AgNo₃) in the solution is 0.127 M.

To calculate the molarity of silver nitrate (AgNO₃) in the solution, we first need to determine the number of moles of silver nitrate present. We can do this by using the mass percentage of silver nitrate, which tells us that 28.0% of silver nitrate is present in every 100 g of solution is:

(28.0/100)×100g = 28 grams

Next, we need to determine the number of moles of silver nitrate present by using the molar mass of AgNO₃, which is 169.87 g/mol:

28g / 169.87g/mol = 0.164 moles

Next, we use the density of the solution to determine the volume:

1.29g/ml = 1.29g/1ml = 1.29ml

We can then use the formula molarity = moles of solute / liters of solution to calculate the molarity of the silver nitrate in the solution:

molarity = moles of solute / liters of solution

molarity = 0.164 moles / 1.29ml

molarity = 0.127 M

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Basalt is 65.5 million years ago to the present. Limestone with fossil was about 500 million years ago. Sandstone with trilobite is between 525 and 505 million years old.

A quantifiable measurement of how old something is or how long ago it occurred, expressed typically in terms of years, is called an absolute age in geology.

Radiometric techniques are used the most often in geology to determine absolute ages.

Basalt was formed 65.5 million years ago. Fossilized limestone dates back to roughly 500 million years. Trilobites are found in sandstone that is between 525 and 505 million years old.

In the Carboniferous epoch, about 340 million years ago, the earliest amniotes diverged from their amphibian predecessors. Soon after the first amniotes emerged, they split into two major lines.

Thus, these are the probable ages of the given rocks.

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Answer:

a

Explanation:

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Chemical containers must be sealed properly when they are stored after the experiments ends so that the chemicals do not react with atmospheric gases.

It is advisable to use laboratory grade refrigerators and freezers to store sealed chemical containers containing flammable liquids that requires a cool storage.

Chemicals that are hazardous must be stored below eye level and should not be kept on the floor or window edges.

Chemicals must be stored in containers that are made up of materials that do not react with the composition of the chemical stored in that particular container. Strong acids and bases should be stored separately.

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The bonds occur between two atoms in each of the which the number of the protons not equals  to the number of electrons is the 1)  ionic bond.

An atom which do not have the number of the protons is equals to the number of the electrons is called as the ion. The ion may be positive or negative charge.

The ionic bond is formed between the negatively charged atom and the positively charged atom. The compound formed between the atoms by the complete transfer of electrons called as the ionic compounds and the bond is called as the ionic bond.

The given question is incomplete, the complete question is :

which bonds occur between two atoms in each of which the number of protons does not equal the number of electrons? select all that apply.

1) Ionic bond

2) covalent bond

3) coordinate bond

4) none of the above

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The action of dissolving Epsom salts (magnesium sulfate) in water and observing the crystals that are left behind after the water evaporates is a physical change, not a chemical change.

A chemical change is a process that leads to the formation of new substances, whereas a physical change is a process that alters the form of a substance without creating new substances. In this case, the Epsom salts are not forming new substances when it dissolves in water, it is simply change its state from a solid to a solution. And when the water evaporates, the Epsom salts will change back to their original solid form. Evidence to support this claim can be found in the fact that the chemical composition of the Epsom salts remains the same before and after the dissolution process. Magnesium sulfate has the same chemical formula (MgSO4) before and after being dissolved in water, and also before and after the water evaporates. The chemical composition is unchanged and the substance is still magnesium sulfate.

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The percent yield of the reaction of H2O2 is found to be 21.16%

The theoretical yield is the yield that is obtained using a balanced chemical reaction. What you actually obtain in a chemical reaction is the actual yield. The actual yield is evaluated with the theoretical yield to establish the percent yield.

2 H2O2 => 2H2O + O2

78.2 mL of 4.6 M solution of H2O2 :

=> 78.2/1000*4.8= 0.359 mole H2O2

2 moles H2O2 ---> 1 mole O2

=> 0.359 moles H2O2-----> x mole O2

 x  => 0.359/2= 0.1795mole O2

0.038 mole O2 was collected

Thus, percent yield = 0.038/0.1795*100=21.16%

Actual Yield is the quantity of a product discovered to be created during a chemical process.

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The predication that is testable here is that of Raymond. Option D

We have to keep it at the back of our minds that science deals with data that is testable. In other words, science is an empirical discipline. What we mean by this is that we must be able to get at knowledge by testing the data that we have in controlled experiments.

Now, if we look at the responses of the students, we can see that the only one that has to do with something that we can test is the one that said that Ocean surface temperatures are warmer than water at deep-sea vents.

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By counting how many 1/2 lifts it has experienced, we or Scientists may determine its exact age. For each 12 lives in the case of carbon, it takes 5730 years.

Carbon-14 is a radioactive isotope that is commonly used to determine the age of organic materials, such as wood, bones, and shells. It is formed in the upper atmosphere when cosmic rays interact with nitrogen atoms, and it is incorporated into living organisms through photosynthesis or ingestion. Once an organism dies, it stops taking in Carbon-14, and the isotope begins to decay at a steady rate.

The half-life of Carbon-14 is the amount of time it takes for half of the original amount of the isotope to decay. For Carbon-14, the half-life is about 5,730 years. This means that after 5,730 years, half of the Carbon-14 atoms in a sample will have decayed into Nitrogen-14.

So, Scientists can use the half-life of Carbon-14 to determine the absolute age of a rock sample by measuring the ratio of Carbon-14 to Carbon-12 in the sample. By comparing this ratio to the known decay rate of Carbon-14, scientists can calculate the amount of time that has passed since the organism died, and therefore the age of the rock sample.

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The solution is excess hydrogen ions and a low ph.

It probably has a low pH and too many hydrogen ions. Acid mine drainage (AMD), which lowers the pH of water resources and makes dissolved metals easily available for uptake by benthic animals and fish, is a significant contributor to the entry of these contaminants into the human food chain. The term "acid mine drainage" refers to the runoff that results from water coming into touch with exposed sulfur-bearing minerals. These minerals react with the water and air to produce sulfuric acid and dissolved iron. Heavy metals like copper, lead, and mercury are dissolved by this acidic runoff, contaminating both groundwater and surface water. Mine drainage issues include tainted drinking water, hampered aquatic plant and animal development and reproduction, and the acid's corrosive effects on parts.

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On increasing the temperature, the equilibrium will shift towards the left as when we increase the temperature, the solubility of gases in the liquid decreases.

The solubility of gases depends on the temperature. When we increase the temperature of a liquid, the solubility of gases decreases. This happens because the kinetic energy of the molecules increase and the gas escapes the liquid.

N₂ (gas) ⇄ N₂ (aq)

According to the above equation, the nitrogen gas is in equilibrium with the liquid nitrogen. The equilibrium will shift to the left as the solubility will decrease and N₂ will escape from the liquid on increasing then temperature.

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An atom with four electrons in its valence shell is capable of forming double and triple covalent bonds with oxygen.

An atom with four valence electrons is typically carbon or silicon, they are both capable of forming covalent bonds with oxygen by sharing electrons. A single covalent bond is formed when two atoms share one pair of electrons. A double covalent bond is formed when two atoms share two pairs of electrons, and a triple covalent bond is formed when two atoms share three pairs of electrons. In the case of carbon and silicon, they can share 4 electrons with an oxygen atom in order to fill their valence shell. This would result in the formation of a double covalent bond, CO2 or SiO2. Additionally, they can share 6 electrons with an oxygen atom, which would result in the formation of a triple covalent bond, CO3 or SiO3.

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If an atom has four electrons in its valence shell it can form one double bond or two single covalent bond with oxygen.

Covalent bond is a type of bond that is formed between non-metal atoms. Covalent bond is formed as a result of sharing electrons between non-metal atoms involved. This type of bond is formed when atoms involved contribute equal number of electrons to the bond formation. The atom with four outer most electrons may share its electrons with two oxygen atoms to form a compound with a double covalent bond. Valence shell is defined as an electron in the outer shell associated with an atom. This can participate in the formation of a chemical bond if the outer shell is not closed. A shared pair forms with both atoms in the bond each contributing one valence electron in a single covalent bond.

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To make an abstract design, use the MS Paint tool. To build the design, you may utilize form tools such as circles, squares, and triangles. You may also utilize the color pallet to add color to the shapes.

You may also use the paint brush to draw patterns or lines. You may use the text tool to add text to the design for the title. You may select a typeface and color that compliments the overall design. For example, you might call it "Chaotic Harmony" or "Colorful Illusion" to convey the abstract design. You may use the text tool to add text to the design for an intriguing title. You may select a typeface and color that compliments the overall design. a simple abstract design using shape tools and color palette on MS paint. Give it an interesting title using paint tool.​ You may use the text tool to add text to the design for an intriguing title. You may select a typeface and color that compliments the overall design.

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238 92 U => l234 90 Th + 4 2 He represents the accurate nuclear chemical equation for this operation. As a result, uranium-238 decays by emitting -particles, which results in the production of thorium-234.

According to the following chemical equation: 238 92 U => l234 90 Th + 4 2 He The subscript sums (atomic numbers or charges) on both sides of the equation must be same, as this is crucial information. A -particle contains the nucleus of helium. Having two protons and two neutrons gives it a mass of four. As an atomic nucleus decays, an alpha particle is released. It transforms (or decays) into an atom that has an atomic number of 2 fewer and a mass number of 4 less.

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The vapor pressure of the solution of 1.48 m Al(NO₃)₃ at 45.0 °C is 71.93 torr.

This can be calculated using Raoult's law. The law states that the vapor pressure of a solution is inversely proportional to the mole fraction of the solvent (not the solute).

The following formula can be used to get the vapor pressure of a solution of 1.48 m Al(NO₃)₃ at 45.0 °C:

P = P° × Xsolvent

where P is the vapor pressure of the solution, Xsolvent is the solvent's molecular weight, and P° is the solvent's pure vapor pressure.

The solvent's mole fraction is equal to 1 because it is presumed that the solute has entirely broken down. In this instance, the solution's vapor pressure is the same as the pure solvent's, which is 71.93 torr at 45.0 °C.

Hence, the vapor pressure of the solution of 1.48 m Al(NO₃)₃ at 45.0 °C is 71.93 torr.

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