Which one is the correct answer

Solubility increases.

Answer:

solubility increases

Explanation:

For example with gases dissolved in liquids, a rise in temp would decrease solubility. There are even some solid in liquid soln where increasing temps decreases solubility.

Answer:

The answer is: A. Photosynthesis

Explanation:

The options B,D and E are examples of exothermic reactions.

An exothermic reaction is a chemical reaction that releases energy to the enviroment.

Option C is an example of the transformation of energy (in this case, chemical energy to electric energy)

Now, the option A  mentions the photosyntesis process.

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy. Plants take carbon dioxide from the air and water from the soil, and with help of proteins called reaction centres that contain green chlorophyll pigments, the plants can absorb light energy , and transform this elements to sugars and oxygen.

The sugars store the light energy absorbed in the form of chemical energy, in order to be used for the plant energy necessities, and the oxygen is released to the air.

The correct answer is option B.

An ephemeral stream is one that flows only after rainfall.

Ephemeral streams only exist for a short period of time. They are often found in the desert landscape. Desert climate is arid with sparse to no vegetation. Without plants in the soil, rain water does not get absorbed, and so after rainfall excess water flow as ephemeral streams.

B. An ephemeral stream is one that flows only after rainfall

Answer:

A) Matter cannot be subdivided.

Explanation:

Hope this comes to your aid.

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the incorrect statement is matter cannot be subdivided.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. Degree of Celsius is used to measure temperature which has nothing to do with matter.

Therefore, the incorrect statement is matter cannot be subdivided.

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It takes 33.4 s for the concentration of A to fall to one-fourth of its original value.

A half-life is the time it takes for the concentration to fall to half its original value.

Assume the initial concentration is 1.00 mol/L. Then,

[tex]\text{1.00 mol/L }\stackrel{\text{1st half-life }}{\longrightarrow}\text{ 0.50 mol/L } \stackrel{\text{ 2nd half-life }}{\longrightarrow}\text{0.25 mol/L}\\[/tex]

The concentration drops to one-fourth of its initial value in two half-lives.

∴ Time = 2 × 16.7 s = 33.4 s

Coffee thermos- Maintains heat in the thermos through insulation

Kitchen Appliances- Applicances such as refrigerators keep items cool, while toasters and pots are used to heat items up

Lunchbox- Many lunchboxes are insulated with materials that enables the box to keep cool.

13. Bilateral. If it were to split up, it would create an equal two sides.

14. Since the butterfly has the same symmetry as the sea slug, it would seem as though it matches well with it. As the question states that most organisms relate more because of symmetry, this would be a definite answer. Even though they are not the same organism family.

-Mabel <3

Answer:

The correct answer is chemical engineers.

Explanation:

The rational drug design also known as drug design refers to the innovative procedure of discovering novel medicines on the basis of the information of a biological target. The drug is generally a small organic constituent, which prevents or stimulates the activity of a biomolecule like a protein that in turn benefits the patient therapeutically. The drug is designed with the help of teams comprising scientists and several chemical engineers.

The correct answer is option 4 and 5.

The electron domain geometry for an ammonia molecule, NH₃ has tetrahedral electron domain geometry. In NH₃ there are three bond pair electrons and one lone pair electron. Therefore, NH₃ has four electron pairs which are distributed in a tetrahedral shape.

The molecular geometry for an ammonia molecule, NH₃ is trigonal-pyramidal molecular geometry. Ammonia has one lone pair of electron and three bond pairs of electrons thus the resulting molecular geometry is trigonal-pyramidal.  

For an ammonia molecule, the electron domain geometry is tetrahedral, and the molecular geometry is trigonal pyramidal. Therefore, the fourth and fifth option is correct.

The electron domain geometry describes the arrangement of electron domains around the central atom, where an electron domain can be a bond or a lone pair of electrons.

Molecular geometry refers to the arrangement of atoms in a molecule, considering both the bonding and nonbonding electron pairs.

In ammonia, the three hydrogen atoms are bonded to the central nitrogen atom, and the nitrogen atom has one lone pair of electrons.

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Answer is: A) it would increase .

Boyle's Law (the pressure-volume law): volume of a given amount of gas held at constant temperature varies inversely with the applied pressure when the temperature and mass are constant.  

p₁V₁ = p₂V₂ (the product of the initial volume and pressure is equal to the product of the volume and pressure after a change).

For example:

p₁ = 1.2 atm; starting pressure.

V₁ = 2.0 L., starting volume.

V₂ = 1.0 L; final volume, smaller than starting volume.

p₂ = ?; final pressure.

1.2 atm · 2 L = p₂ · 1 L.  

p₂ = 1.2 atm · 2 L / 1 L.  

p₂ = 2.4 atm.

When volume goes up, pressure goes down.  

When volume goes down, pressure goes up.  

The mass needed is [223] g O₂.  

M_r:    26.98    32.00  

             4Al   +   3O₂ ⟶ 2Al₂O₃

n/mol:  9.30

Moles of O₂ = 9.30 mol Al × (3 mol O₂/4 mol Al) = 6.975 mol O₂

Mass of O₂= 6.975 mol O₂× (32.00 g O₂/1 mol O₂) = 223 g O₂

An Environmental Impact Study is used to provide a sufficient level of detail to demonstrate that a proposed development will have no negative impacts on the natural features or ecological functions of the subject and surrounding (“adjacent”) lands. Hope this helps!!!

Reactivity is a chemical property, energy transferring between products and reactants is true of a chemical reaction, melting a substance and metal denting are physical changes, while digesting a sandwich is a chemical change.

The chemical property of a substance from the given options is reactivity. A chemical property is related to how a substance interacts with other substances, and reactivity is an example of this.

For a chemical reaction, it's accurate to say that energy is transferred between products and reactants. During a chemical reaction, energy can either be absorbed or released, indicating a transfer of energy.

An example of a physical change from your list would be melting a substance. Physical changes involve a change in the physical properties of a substance, like its state of matter, but the substance itself doesn't change.

A chemical change involves a substance changing into a new substance with different properties. In this case, digesting a sandwich is a chemical change because it causes the food to break down into different substances.

Finally, from your list, an example of a physical change would again be metal denting. A physical change alters a substance without changing its composition, like denting a metal object does.

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The chemical property of hydrogen gas is that it burns in the air.  

• The lightest element is hydrogen, it can explode at concentrations ranging from 4 to 75 percent by volume in the existence of a flame, sunlight, or a spark.  

• One of the prime chemical properties of hydrogen gas is that it is highly flammable and can burn in air at a very broad array of concentrations that is between 4 to 75 percent by volume.  

• Some of the physical properties of hydrogen gas are that it is colorless, odorless, nonmetallic, non-toxic, exhibits a density of 0.09 grams per liter, and has a boiling point of -252.87 degree C or 20 K at standard pressure.  

Thus, of the mentioned statements, option 2 is correct, that is, the chemical property of hydrogen gas is that it burns in the air.  

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Topaz scratches quartz

Answer:

The correct answer is :'Topaz scratches quartz'.

Explanation:

Mohs scale is a qualitative scale to analyse and characterize scratch resistance of minerals.Harder mineral will easily scratch softer mineral.

Lower value on the scale indicates that mineral can be easily scratched by the another mineral with higher scale value. In other words calcite with scale value of 3 can easily scratch gypsum  and talc with scale value of 2 and 1 respectively.

So, from the given options the correct test is that topaz scratches quartz.

Answer:

Metals are malleable.

Explanation:

The metals are the substances possessing an abundant amount of electrons. They are placed majorly on the left side of the periodic table. The metals are considered as the good conductors of electricity and heat, they are lustrous in appearance, and usually have a high melting point. However, the main property, which distinguishes it from other substances is that they are malleable and ductile, that is, they can be transformed into wires and thin sheets.

The first step is canceling out the like term, in this case it is the atoms and mole specification.  I use e instead of multiplying times 10 to a power, it is mostly used in higher sciences but I think it is easier and it is in most calculators.  So your equations is 7.43e22 Mg multiplied by (1/6.02e23) multiplied by (24.30) Mg.  So all together it is 7.43e22 (1/6.02e23) (24.30).  Then just multiply across, it is easier to break it up.  7.43e22 times (1/6.02e23)= .1234219269.  Take that and multiply it by 24.30.  So that looks like (0.1234219269)x(24.3)= 2.999152824.  So if it would be 2.9992 grams of Mg.

Hey there!

Mass = 8.53 g

Volume = ?

Density = 2.54 g/mL

Therefore:

D = m / V

2.54 = 8.53 / V

V = 8.53 / 2.54

V = 3.35 mL

Hope that helps!

Chemical change: a change that occurs when one substance combines with another substance to make a new substance

Physical change: a change to any physical property of a substance

The reaction is a synthesis…

[tex]4Al + 3O_2 \longrightarrow 2Al_2O_3\\[/tex]

… because two substances are combining to make one other substance.

[tex]4\stackrel{\hbox{0}}{\hbox{Al}} + 3\stackrel{\hbox{0}}{\hbox{O}}_2 \longrightarrow 2\stackrel{\hbox{+3}}{\hbox{Al}}_2\stackrel{\hbox{-2}}{\hbox{O}}_3\\[/tex]

It is also a reduction-oxidation reaction because the oxidation number of Al increases from 0 to +3 and the oxidation number of O decreases from 0 to -2.

The chemical family in Group 7A is known as halogens due to shared characteristics like high electronegativity, non-metallic nature, diatomic molecule formation, strong oxidizing properties, and the ability to form salts with metals.

1: Identify the elements in Group 7A:

Group 7A (also sometimes called Group 17) of the periodic table contains the following elements:

Fluorine (F)

Chlorine (Cl)

Bromine (Br)

Iodine (I)

Astatine (At)

2: Look for shared characteristics:

These elements share a number of important chemical and physical properties that make them unique:

High electronegativity: They have a strong tendency to pull electrons towards themselves, meaning they readily react with other elements to gain their one missing electron and achieve a stable, full octet configuration.

Non-metallic: They are non-metals, meaning they are poor conductors of heat and electricity, and often brittle.

Diatomic molecules: They exist as diatomic molecules, meaning they are composed of two atoms of the same element bonded together.

Strong oxidizing agents: They have a strong tendency to accept electrons from other elements, making them powerful oxidizing agents.

Form salts: They readily react with metals to form ionic salts, where the halogen gains an electron and becomes a negatively charged anion (usually with a -1 charge), while the metal loses electrons and becomes a positively charged cation.

3: Connect the name to the shared characteristics:

The group name, halogens, comes from the Greek words "halo" meaning "salt" and "gen" meaning "former." This name reflects their strong tendency to form salts when they react with other elements.

Therefore, based on their shared characteristics, particularly their strong salt-forming ability, the common name for the chemical family in Group 7A is halogens.

Complete question:

Group 7A — What is the common name of this chemical family?

The common name of a chemical family refers to traditional names of groups of elements or compounds with similar properties, such as alkali metals, alkaline earth metals, and organic compound families like hydrocarbons and alkyl halides. Names like water, ammonia, and methane are common names for simple chemical compounds.

The common name of a chemical family refers to the simplistic, often traditional, name given to compounds or groups of elements with similar properties. A well-known example is the alkali metals, which constitute the first group in the periodic table. Similarly, the second group contains the alkaline earth metals. Common names for chemical compounds include water (H2O), ammonia (NH3), and methane (CH4). Moreover, in organic chemistry, families of compounds include halogen substituted hydrocarbons like alkyl halides, oxygen-containing compounds such as alcohols, carboxylic acids, and esters, and nitrogen-containing compounds like amines and nitriles.

To illustrate, for alkyl halides with simple alkyl groups, the common name comes from the name of the alkyl group followed by the halogen name with an '-ide' ending. Families of organic compounds like hydrocarbons are classified as alkanes, alkenes, alkynes, and arenes, based on their structure and bonding. Insecticides can be grouped into chemical families as well, such as organochlorines, organophosphates, and carbamates.

Mass defect and binding energy are related as

ΔE = Δmc^2

Where

ΔE = binding energy

Δm = mass defect

c = speed of light

given

mass defect = 3.09x 10-27 kg

We know that speed of light = 3 X 10^8 m /s

ΔE = 3.09x 10-27 kg  (3 X 10^8 m /s)^2 = 2.781 X 10^-10 J / Kg

.

.

Answer:

A

Explanation:

2.78 × 10-10 J Is the answer

Answer:

35.8 u

Explanation:

The atomic mass of Cl is the weighted average of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent abundance).

Atomic mass of Cl-35 = 17p + 18n = 17 × 1.007 u + 18 × 1.009 u

= 17.119 u + 18.162 u = 35.28 u

Atomic mass of Cl-37 = 17p + 20n = 17 × 1.007 u + 20 × 1.009 u

= 17.119 u + 20.180 u = 37.30 u

Set up a table for easy calculation.

0.755 × 35.28 u =  26.64  u

0.245 × 37.30 u =    9.138 u

              TOTAL = 35.8     u

Note: The actual atomic mass of Cl is 35.45 u.

The calculated value above is incorrect because

(a) the given isotopic percentages are incorrect and

(b) the protons and neutrons have less mass when they are in the nucleus than when they are free. Thus, the calculated masses of Cl-35 and Cl-37 are too high.

The average atomic mass of chlorine can be calculated as a weighted average of its two isotopes' masses, with weights reflecting their proportions. Isotopes are variations of an element with different numbers of neutrons, and understanding them helps us calculate average atomic masses. Similar calculations apply for other elements with multiple isotopes, such as boron.

The subject of this question is the average atomic mass of the element chlorine (Cl), given the proportions of its two isotopes: chlorine-35 and chlorine-37, with the respective proportions of 75.5% and 24.5%. The calculation is similar to finding a weighted average. This involves multiplying each individual isotope mass by its percentage (expressed as a decimal), and then adding the products together: (35amu*0.755) + (37amu*0.245).

Isotopes are variations of an element that have the same number of protons, but different numbers of neutrons. This concept is important in understanding the calculation of an element's average atomic mass. The atomic mass listed on the periodic table for each element is a weighted average of its isotopes' masses, with the weights being the natural abundance of each isotope. This is why elements, even those with atomic masses in square brackets due to their unstable nature, have precise average atomic masses.

For example, a similar element, boron, has two isotopes as well: 19.9% of all boron atoms are ¹0B with a mass of 10.0129 amu, and the remaining 80.1% are ¹¹B with a mass of 11.0093 amu. The average atomic mass for boron is then also a weighted average, calculated in a similar way to chlorine.

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The answer is 40.5.

Standard form is in answered or not in a different form.

So, you must solve this.

4.05 * 10 = 40.5

Have a great day :) Let me know if you need help with anything else!

The question asked about converting a number in scientific notation to standard form. The number 4.05 x 10 is converted into its standard form by moving the decimal point of 4.05 one place to the right, which gives us 40.5.

The number provided is in a format known as scientific notation. To convert it to its standard form, we just need to follow a few steps. The number provided is 4.05 x 10. Converting this to standard form involves multiplying the number outside the 'x' (i.e., 4.05) by 10. However, as there's no specified power of 10 provided (like 10^2, 10^3 etc.), we assume it to be 10^1. So, we simply move the decimal point in 4.05 one place to the right because it's 10^1. Thus, the standard form of 4.05 x 10 is 40.5.

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The dissolving of substance A released heat and the dissolving of substance B absorbed heat is the correct interpretation of given data.

Those chemical reaction which emits heat after the completion of reaction is known as exothermic reaction and those reaction which absorbs heat is known as endothermic reaction.

According to the given data, after completion of reaction temperature increases from 25.1°C to 30.2°C as substance A emits heat. And substance B may absorb the heat as the temperature of the reaction falls from 25.1°C to 20.0°C.

Hence option (A) is correct.

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A. I, III, and IV only.

Answer:

A. I, III, and IV only

Explanation:

The cycling of water in and out of the atmosphere is an important determinant of weather and climate. Changes in humidity and average rainfall usually depend on this factor.

Uneven heating of the earth by the sun also creates unique patterns of changes in weather and climatic conditions around the world.

Global patterns of atmospheric movement affect parameters such as wind speed etc.

Scientists must describe their procedures and honestly report their ... should be similar- if the results are not similar and consistent then the experiment must be done again.

It is important to share the exact procedure of a science experiment, so that independent labs can repeat the experiment and arrive at similar result or observation. This helps to establish consensus in the scientific community where scientists mutually agree on a theory. Hiding any significant part from the materials and procedure section does not allow independent labs to successfully replicate the experiment.