The lab procedure says, "weigh 1.0 g of sodium chloride." Which of the following are acceptable masses?

Answer:

approximately 313 grams

Explanation:

After 1 half-life (14 days), the amount of substance remaining is half of the original amount:

10,000 grams / 2 = 5,000 grams

After 2 half-lives (28 days), the amount remaining is half of the amount remaining after 1 half-life:

5,000 grams / 2 = 2,500 grams

After 3 half-lives (42 days), the amount remaining is half of the amount remaining after 2 half-lives:

2,500 grams / 2 = 1,250 grams

After 4 half-lives (56 days), the amount remaining is half of the amount remaining after 3 half-lives:

1,250 grams / 2 = 625 grams

After 5 half-lives (70 days), the amount remaining is half of the amount remaining after 4 half-lives:

625 grams / 2 = 312.5 grams

Rounding to the nearest whole number, you would have approximately 313 grams remaining after 70 days.

1. The study of matter and change is known as chemistry. Chemists investigate matter and change in a variety of ways and with different sorts of systems. The five primary subfields of chemistry historically have been called organic, analytical, physical, inorganic, and biochemistry.

2. Chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry.

3. Analytical chemistry branch of chemistry aids the quality control unit of the country.

4. Bioorganic chemistry merges organic and biochemistry in the direction of biology. Biological systems are studied using the principles of physical chemistry and physics in the field of biophysical chemistry.

5. A prehistoric man recognized that certain metals were more useful for specific jobs than others, and they began to select specific metals for applications. Because gold and silver are both soft metals, they were mostly utilized as ornaments and trade bullion.

Differentiate between gold silver and copper:

- Copper and gold are two separate metal elements, each with its own set of characteristics.

- Gold has a thermal conductivity \($318 W / m K$\), while copper has a slightly greater thermal conductivity of \($401 \mathrm{~W} / \mathrm{mK}$\).

- Copper has a slightly higher electrical conductivity \($5.96 \times 107 \mathrm{~S} / \mathrm{m}$\) than gold, which has a conductivity of \($4.11107 \mathrm{~S} / \mathrm{m}$\).

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Answer:

An electric field is the physical field that surrounds each electric charge and exerts force on all other charges in the field, either attracting or repelling them.

______________

meow

Answer: I think the answer is A

Explanation:

I’m sorry if I’m wrong.

Answer:

Citric acid is a weak organic acid found in citrus fruits.

Explanation:

Answer:

D

Explanation:

The unit used to measure atomic mass is the atomic mass unit (amu). A single amu is equivalent to 1/12 the mass of an atom from the carbon-12 isotopIsotopes with different numbers of protons and neutrons will have an actual mass slightly different from the atomic mass calculated in atomic mass units.

The value of h in the right triangle is 7.7 cm.

Trigonometric ratio is used to show the relationship between the sides and angles of a right angled triangle.

In the right triangle, using trigonometric ratio:

a) sin(31) = h/15

⇒ 0.515 = h/15

Making H the subject of the formula we have:

0.515 x 15 = h/15  x 15

h = 7.725

h \(\approx\) 7,7

Hence, is is correct to state that the value of h in the diagram is 7.7 cm approximately. See the attached image.

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Full Question:

Although part of your question is missing, you might be referring to this full question:

the diagram shows a right-angled triangle. what is the value of h? give your answer correct to 1 decimal place.

1) If the temperature of the system increases, the equilibrium constant k decreases.

2) the concentration of H₂ increases.

The reaction is given as :

CO +  2H₂   ⇄  CH₃OH                          ΔH = -91.8 KJ ( exothermic reaction)

1) Temperature is the only factor that changes the equilibrium constant for the given reaction. As temperature increases equilibrium constant decreases because the reaction is exothermic reaction.

                K = [ CH₃OH ] / [CO] [H₂]²

2) If the temperature increases the position of equilibrium moves to the left and concentration of H₂ increases.

Thus, 1) If the temperature of the system increases, the equilibrium constant k decreases.

2) the concentration of H₂ increases.

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Answer:

MgCl2 on edge

Explanation:

All life on Earth depends on the atom carbon. All plant and animal life involves the ingestion and expulsion of carbon, whether it be for the purpose of producing food or as part of respiration. Carbon is always moving from one location to another.

Explain how carbon can move through the organisms in that ecosystem.

Carbon moves from photosynthetic plants to other consumers in the kelp forest. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.

Ecosystem of the kelp forest:

Water-heating vent Ecosystem:

These bacteria coexist symbiotically with the primary consumer.

On the principal consumer, the other consumers feed.

As a result, we can infer that carbon is transferred from photosynthetic plants to other consumers in kelp forests. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Answer:

D. C → Cl electronegativity difference > 0.5

Explanation:

The electro negativity of an atom in a compound refers to its ability to attract the electrons of a bond towards itself.

On the Pauling's scale, carbon has an electro negativity value of 2.55 while that of chlorine is 3.16. The difference in electro negativity between the both atoms is about 0.61.

The dipole is aslways directed towards the more electronegative atom. Hence the direction is ; C → Cl

Answer:

Chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.

Explanation:

Hope this helps :)

Answer:

A chemical property is any of a material's propertiesthat becomes evident during, or after, a chemicalreaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.

Since it reflects no change in volume – it is most likely that the data recorded in row B is erroneous.

In order to pinpoint the row with a probable error, we will scrutinize the correlation between temperature and volume.

Typically, whenever there is an increase in temperature, there would be an accompanying escalation in the volume of a given substance.

Let's take a closer look at the values reflected in the table:

From A to B: Temperature rises but the volume remains stagnant.

From B to C: Both temperature and volume show an increment.

Similarly, from C to D, as well as from D to E, we see that for every rise in temperature, there is subsequently more volume illustrated.

Given the dissimilarity between rows A and B – where the former shows a temperature increase while the latter reflects no change in volume – it is most likely that the data recorded in row B is erroneous.

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Which row in the table below is likely to represent an error in the student's data collection?

Temperature (°C) Volume (cm³)

A 2.4 5.8

B 21.5 5.8

C 39.6 6.7

D 55.6 6.9

E 71.2 7.4

Answer:

A student collected the data shown above. Row

✔ B

may represent an error.

Explanation:

edge 2023

The Voltage is the pressure from the electrical circuit of the power source that passes the current.

The Voltage is defined as the pressure from the electrical circuit of the power source that will passes the charged electrons that is the current through the conducting loop, it will enable them to do work  because of the illuminating the light. The in simple terms is : voltage = pressure, and it is denoted as the volts and the symbol is the V.

The voltage is described as the force that causes the flow of the charged particles. The Voltage is also called as the electromotive force.

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The three main components of electrolytic cells are cathode, anode and electrolyte. The negatively charged electrolytic cells are cathode and the positively charged electrolytic cells are anode.

An electrolytic cell can be defined as the electrochemical device which uses the electrical energy to perform a non-spontaneous redox reaction. They are mainly used for the electrolysis of certain compounds.

Here the anode cell is:

3H₂O (l) + I⁻ (aq) → IO⁻₃ (aq) + 6e⁻ + 6H⁺ (aq)

cathode cell is:

14H⁺ (aq) + Cr₂O₇²⁻ (aq) + 6e⁻ → 2Cr³⁺ (aq) + 7H₂O (l)

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Answer:

D

Explanation:

D because scientists study cells to know how to help people when they are sick

hope this helps (it might be wrong)

Answer:

Explanation:

1.08kg/50.5 cm^3(1000g/kg)=21.386 g/cm^3

Answer:

\(\boxed {\boxed {\sf 21.4 \ g/cm^3}}\)

Explanation:

We are asked to find the density of an object.

The density of a substance is its mass per unit volume. It is calculated by dividing the mass by the volume.

\(\rho= \frac{m}{v}\)

The mass of the object is 1.08 kilograms. The object displaced 50.50 cubic centimeters of water, so this value is its volume.

We are asked to give the density in grams per cubic centimeter, so we must convert the mass. There are 1000 grams in 1 kilogram. Set up a conversion factor.

\(\frac {1000 \ g}{1 \ kg}\)

Multiply by the given mass: 1.08 kg

\(1.08\ kg *\frac{1000 \ g }{ 1\ kg}\)

The units of kilograms cancel.

\(1.08*\frac{1000 \ g }{1}\)

\(1.08*{1000 \ g } = 1080 \ g\)

Now we know the mass in grams and the volume:

Substitute the values into the density formula.

\(\rho= \frac{1080 \ g }{50.50 \ cm^3}\)

Divide.

\(\rho= 21.3861386 \ g/cm^3\)

The original measurements of mass and density have 3 and 4 significant figures. Our answer must have the least number of significant figures, or 3.

For the number we found, that is the tenths place. The 8 in the hundredth place tells us to round the 3 in the tenths place up to a 4.

\(\rho \approx 21.4 \ g/cm^3\)

The density of the object is approximately 21.4 grams per cubic centimeter.

Answer: FeO

Explanation:

Answer:

This is not worth 50 points liar

Explanation:

The amount of heat required to vaporize 181.20 g of ethanol would be 170.1 kJ.

Using the formula:

Q = n ∆Hvap

where:

Moles of 181.20 g of ethanol = 181.20 g / 46.07 g/mol = 3.933 mol

Substituting the values:

Q = 3.933 mol x 43.3 kJ/mol = 170.1 kJ

In other words, the amount of heat required to vaporize 181.20 g of ethanol is 170.1 kJ.

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54.58g of Medicine would be usual dose for a 18 month old weighing 19 pounds.

Here, given that usual dose  for children of use between 6 month to 2 year  fever, is 5 mg per kg body weight.

1 kg body weight require 5 mg dose of medicine. and are have to find out how much dose of medicine

Required for 18 month children whose weighing is 24 pounds.

So, first are convert all the data in milligram because answer is required in mg. we know that

1 pound = 0.454K2

1 kg= 100 mg

.: 24 pounds = 24X0. 454 x 100 mg

[ 1 pound = 0.454 K2 then 24 pound = 24×0.454k2. and 24x0.454g = 24×0.454 × 100 mg

Now, 10 mg body weight remise dose is 5 mg then 24x054xlos my body.

required dose of children of 18 month and weighing is 24X0.454x100 mg is = 24x0.454x100 x 5 106 = 54.48 mg.

Answer: 54.48 mg.

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Answer:

hydrogen

Explanation:

can i have brainliest please

The element fluorine has 9 electrons. The electron configuration for an atom of fluorine is 1s2 2s2 2p5.

Fluorine is one of the element of the periodic table. It have 9 as atomic number and 19 as mass number. The electronic configuration of fluorine is 1s2 2s2 2p5. It belongs to 17th group. It is most electronegative atom. Because it accept one electron to get stable electronic configuration.

It belongs to 2nd period and belongs to p-block.

In the quantum chemistry and atomic physics, the electron configuration is defined as the distribution of the electrons of an atom or molecule in molecular or atomic orbitals. Electrons first enter clock wise then anti clockwise.

Thus, we concluded that element fluorine has 9 electrons. The electron configuration for an atom of fluorine is 1s2 2s2 2p5.

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Convex lenses refract light inward toward a focal point. Light rays progress through the edges of a convex lens and are bent most.

convex lenses are across in the middle. Rays of light that pass through the lens are conducted closer together (they converge). A convex lens is a meet lens. When parallel rays of light pass through a convex lens the refracted rays cross at one point called the principal focus.

. A convex lens is a connecting lens. When parallel rays of light pass through a convex lens the refracted rays merge at one point called the principal focus.

So we can conclude that Convex Lens. Concave Lens; It is known as a converging lens as light rays, when passed through this lens, tends to bend towards each other. It is known as a Convex Lens

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The maximum number of Percocet tablets a patient can take daily, while staying within the recommended acetaminophen dose of 3.9g, is 12 tablets.

To determine the maximum number of Percocet tablets a patient can take daily without exceeding the recommended dose of 3.9g of acetaminophen, we need to perform a unit conversion.

1. Convert 3.9g to mg (since the amount of acetaminophen per tablet is given in mg):  3.9g = 3900mg

2. Calculate the number of Percocet tablets based on the amount of acetaminophen per tablet:  Each Percocet tablet contains 325mg of acetaminophen.

3. Divide the maximum allowable dose of acetaminophen (3900mg) by the amount of acetaminophen per tablet (325mg) to find the maximum number of tablets: 3900mg / 325mg = 12 tablets

Therefore, the maximum number of Percocet tablets a patient can take daily without exceeding the recommended dose of acetaminophen (3.9g) is 12 tablets.

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Answer:

Hi there!

A precipitate is the creation of a solid from a chemical reaction of liquids

Hope this helps!

Answer:

it's a cause(an event or situation, typically one that's is bad or undesirable) to happen suddenly, unexpected, or prematurely.

Answer:

Both diseases affect the control of voluntary muscles.

Explanation:

Parkinson's disease is a progressive brain disease that affects movement. It affects the nerve cells that produce dopamine in the part of the brain called substantia nigra. The symptoms include shaking, stiffness, and difficulty with walking, balance, and coordination. Symptoms get worse with time, often leaving people with difficulty walking and talking.

ALS (amyotrophic lateral sclerosis) is a progressive nervous system disease that affects nerve cells in the brain and spinal cord. The first symptoms usually involve muscle weakness, and as the disease progresses, it results in the loss of muscle control.

Scientists don't know the exact cause of these diseases. As the cause is not known, there is no exact way to prevent them. There is no cure for them, either. The treatment is focused on the management of symptoms.

This is why the third option is the correct one.