An object was measured by a worker as
17.400 cm long, however, the manufacturer
specifications list the length of the object
at 17.900 cm. What is the percent error in
the worker's measurement?
a. 2.79% or b. 2.87%

The increase in the quantity of hydrogen ions in blood as a result of increase of carbon dioxide when carbon dioxide react with water to form carbonic acid which further dissociate to form hydrogen ion.

Carbon dioxide influences the pH of blood by reacting with water to form carbonic acid (H₂CO₃), which can dissociate to form a hydrogen ion (H⁺) and a hydrogen carbonate ion (HCO₃⁻).

Increasing the concentration of carbon dioxide in the blood therefore results in more H+ ions and a lower pH.

Thus, the increase in the quantity of hydrogen ions in blood as a result of increase of carbon dioxide when carbon dioxide react with water to form carbonic acid which further dissociate to form hydrogen ion.

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Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of aluminum = 12 cm³

Density = 2.70 g/cm³

The mass of aluminum is

mass = 2.7 × 12

We have the final answer as

Hope this helps you

The concentration of the solution in g per dm cube is 35.24 g/dm cube.

The amount of sand in grams is 0.2 g and the volume of the solution is two-thirds of a litre. We have to find the concentration of the solution in g per dm cube.To find the concentration of the solution in g per dm cube, we need to know the concentration of ethanol. As the concentration of ethanol is not given in the question, let us assume the concentration of ethanol is 100%. Therefore, the volume of ethanol in the solution is

(1 - 2/3) litres= 1/3 litres= 1000/3 mL.

As the density of ethanol is 0.789 g/mL,

the mass of ethanol in the solution is:

0.789 g/mL × 1000/3 mL= 789/3 g

The mass of the solution is:

789/3 g + 0.2 g= 2367/9 g

The volume of the solution in dm cube is:

2/3 L= 0.67 dm cube

The concentration of the solution in g per dm cube is: (2367/9 g)/(0.67 dm cube)≈ 35.24 g/dm cube.

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The correct order of the materials from the biggest to smallest size is option b, gravel, salt, soil and talcum powder.

Gravel is the aggregates of less rounded rocks. In some locations, heavy metallic ore deposits like cassiterite or native metals like gold, in the form of nuggets or flakes, can be found accumulating in gravel beds. Gravel is a common building material.

Therefore, the gravel is the biggest here. Salt in nature appears as salt rocks. Soil is some more grained. Talcum powder is very fine and tiny soft particles. Hence, talcum powder is the smallest here.

Therefore, the order of materials from biggest to smallest is option b, gravel, salt, soil and talcum powder.

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Answer:

275.9 m/s2

Explanation:

a = 40N ÷ 0.145 kg

Answer:

275.9 m/s2

Explanation:

275.9 m/s2

The sοurces which shοuld be examined in a study tο determine the impact οf a geοlοgic sοurce οn levels οf CO₂ in the atmοsphere, accοrding tο the given οptiοns are Vοlcanοes.

Geοlοgic sοurces refer tο natural prοcesses and events related tο the Earth's geοlοgical activities. These sοurces include vοlcanic eruptiοns, geοthermal activity, release οf gases frοm undergrοund reservοirs, and geοlοgical fοrmatiοns that cοntain οr release certain substances. These sοurces can cοntribute tο the release οf variοus gases, including carbοn diοxide (CO₂), intο the atmοsphere.

Therefοre, The sοurces which shοuld be examined in a study tο determine the impact οf a geοlοgic sοurce οn levels οf CO₂ in the atmοsphere are Vοlcanοes.

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Answer:

2KClO3 (s) -------> 2KCl (s) + 3O2 (g)

Explanation:

Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.

Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.

Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;

2KClO3 (s) -------> 2KCl (s) + 3O2 (g)

La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.

Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple

Answer:

Its a rock planet and has an iron core

Explanation:

Answer:

"a rocky planet with a huge iron core"

it takes up nearly 3/4of the planets diameter

It orbits around the sun

Answer:

Density=mass/volume

= 570/2280

=0.25g/ml

Answer:

true!

Explanation:

Answer:

The common application of indicators is the detection of end points of titrations. The colour of an indicator alters when the acidity or the oxidizing strength of the solution, or the concentration of a certain chemical species, reaches a critical range of values.

A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Explanation:

The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun. ... The ozone layer filters out most of the sun's harmful UV radiation and is therefore crucial to life on Earth.

Explanation:

Chemical fertilizers raise crop yields, but their heavy usage has hardened the soil, diminished fertility, reinforced pesticides, contaminated air and water, and emitted greenhouse gases, posing health and environmental risks.

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

The equilibrium constant (Keq) is the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, all raised to their stoichiometric coefficients.

Only gases and aqueous species are included.

        NH₄SH(s) ⇋ NH₃(g) + H₂S(g)

I                                 0           0

C                               +x          +x

E                                x            x

Keq = 1.2 × 10⁻⁴ = [NH₃] [H₂S] = x²

x = 0.011 M

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

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Answer:

there are 6 significant figures in 107.051

Answer:

There Are 6 Significant Numbers

Explanation: But some problems stop at the . so it could 3 if im right but go with 6!

Answer:

Oxygen gas relighting a glowing splint. The oxygen gas is produced by the decomposition of hydrogen peroxide, which is squirted into a test tube containing the decomposition catalyst manganese (IV) oxide. When the glowing splint is introduced to the test tube, it bursts back into flame when it contacts the oxygen.

Explanation:

hope its help

Oxygen relights a glowing splint due to its role as a strong oxidizer. When a glowing splint is inserted into an environment containing oxygen, it triggers a rapid combustion reaction.

Oxygen readily reacts with the fuel source on the splint (typically carbon compounds), providing the necessary oxygen molecules for the combustion process.

This exothermic reaction releases heat and light energy, causing the splint to re-ignite.

Oxygen's ability to support combustion is vital for many natural processes and industrial applications, as it enables the release of energy stored in various substances, highlighting its importance in sustaining life and various chemical reactions.

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Answer:

0.028kg

Explanation:

We were given 2.6 × 1023 molecules of SO 2 That means that

N = 2.6 × 1023 molecules

Use

n (number of moles) = N

                                     NA (Avogadro's constant)

to get

n =2.6×1023 molecules

   6.02 ×1023 molecules/mol  = 0.432 moles

Now use

m = n × M (molar mass)

to get

m = 0.432 mol × 64.066 g/mol = 27.677 g

So

m (in kilograms) = 27.677 g

                          103 g/kg       = 0.028 kg

Answer:

28 g

Explanation:

In addition, to what ellewhite 1864 wrote, 0.028/1000=28g

If a certain dose of radiation produce a skin burn, a higher dose of radiation will cause the skin burn to be more severe; however, a dose below the threshold level for skin burn will not demonstrate the effect.

The radiation is also known as the electromagnetic radiation. The energy that emittance from the source  and travel thorough space at speed is called as radiations. A dose below the threshold level for the skin burn will not demonstrate the effect.

Thus, If a certain dose of radiation produce a skin burn, a higher dose of radiation will cause the skin burn to be more severe; however, a dose below the threshold level for skin burn will not demonstrate the effect.

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Answer:

QUANTIZATION OF ENERGY- DEFINITION. An electron can radiate or absorb energy as radiation only in limited amounts or bundles called quanta. This is known as the quantization of energy. Quantization is a physical quantity that only has discrete values.

Answer:

A.   it is the lowest at low temperatures

Explanation:

It is true with respect to the kinetic energy of a molecule that the it is the lowest at low temperatures.

The kinetic energy of a molecule is the energy due to the motion of the particles within a substance.

Answer:

A.  it is the lowest at low temperatures

B.  it increases at low temperatures

C.  it is the same at all temperatures

D.  it is the lowest at high temperatures

Formaldehyde is a substance made up of Carbon, Nitrogen, and Oxygen different types of atoms that are chemically combined in a fixed ratio of 1: 2:1. It is classified as an aldehyde.

This refers to a naturally occurring organic compound with the formula CH2O and structure H−CHO. It is also called methanal. The pure compound is a pungent, colorless gas such that it polymerizes spontaneously into paraformaldehyde. It can be stored as an aqueous solution that is formalin. This is also used to store animal specimens.

Formaldehyde is an organic compound. It contains a carbon atom present in its chemical formula. It is also classified as an aldehyde. Formaldehyde(RC=OH) contains a formyl group  and an R group, which is a group that contains carbon and/or hydrogen.

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If you were to spill a little benzoic acid as you mix it with the lauric acid, the calculated molecular weight would be too high.

This is because the amount of benzoic acid would be greater than the amount of lauric acid, and the molecular weight of benzoic acid is higher than the molecular weight of lauric acid.

The molecular weight of a substance is the sum of the atomic weights of the atoms that make up the substance. Benzoic acid has a molecular weight of 122.12 g/mol, while lauric acid has a molecular weight of 200.32 g/mol.

If you were to spill a little benzoic acid, the total amount of benzoic acid and lauric acid would be greater than the amount of lauric acid that would be present if no benzoic acid were spilled.

This would cause the calculated molecular weight to be higher than the actual molecular weight of lauric acid.

To avoid this, it is important to be careful when mixing benzoic acid and lauric acid. It is also important to use a balance that is accurate to at least 0.01 g to measure the amounts of benzoic acid and lauric acid.

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1. The variable that Samia and Carlos are changing when investigating the effect of acids of different pHs on some rock is the pH of the acid.

2. The variables that they need to keep the same are the type of rock used, the amount of acid in each beaker, the size of the beakers, the temperature of the environment, and the duration of the experiment.

3. The safety precautions that Samia and Carlos need to take include wearing gloves, safety goggles, and lab coats to protect their skin and eyes from the acid. They also need to work in a well-ventilated area and handle the acid with care to avoid spills or splashes.

4. Before starting the investigation, Samia and Carlos need to clean and dry the rocks to ensure that their initial weight is accurate.

5. Results Table:

| pH of Acid | Weight of Rock (g) |
|------------|--------------------|
| 1          |                    |
| 2          |                    |
| 3          |                    |
| 4          |                    |
| 5          |                    |
| 6          |                    |

When carbonic acid flows through the cracks of some rocks, it chemically reacts with the rock causing some of it to dissolve. Carbonic acid is especially reactive with calcite, which is the main mineral that makes up limestone.

A  few rocks can produce an extreme reaction with hydrochloric acid. These are usually rocks composed of calcite or aragonite with abundant pore space or extremely high surface areas. Some specimens of chalk, coquina, oolite, and tufa are examples.

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Answer:

a) 1.567 x 10^9

b) 2.36 x 10^(-5)

Chemically active fluids primarily aid in the mobility of dissolved silicate components and facilitate the development of the mineral grains during metamorphism.

During metamorphism, chemically active fluids that are present between the mineral grains help to promote ion movement and the re-crystallization of both old and new minerals.

Rocks that have undergone metamorphism include igneous, sedimentary, and other types of metamorphic rocks. The variations include the creation of new minerals, an increase in grain size, and adjustments to the structure or texture of the rock, depending on the chemical composition of the original rock and the degree of metamorphism.

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Answer:

paper burning is chemical property because burning is a chemical reaction.  salt being a solid is a physical property because phases of matter are physical properties of matter

Answer:

answer  in ppicture

Explanation: