If you want to melt ice into liquid water, does the ice absorbs heat or release heat? Is this endothermic or exothermic?

Answer:

+1

Explanation:

A sodium atom can lose its outer electron. It will still have 11 positive protons but only 10 negative electrons. So, the overall charge is +1.

WE CAN SEE ATOMS!?!?! I swear I'm getting dumber everyday

but I think is like a.... a penny?

Answer:Electrical Conductivity,soluble

Explanation:

Salt is a non-magnetic solid and is soluble in water. Sand is a non-magnetic solid and is insoluble in water.

Electrical Conductivity: Salt is an electrolyte and conducts electricity when dissolved in water or in a molten state. This is because salt dissociates into ions (Na+ and Cl-) that can carry electric current. In contrast, sand is a covalent compound and does not conduct electricity, as it does not dissociate into ions in the same way as salt. Sand is considered an insulator in terms of electrical conductivity.

Answer:

Science: A Boon or a Curse The word science literally means knowledge. The modern age is an age of science. Science is the greatest boon to the modern world. Modern discoveries and inventions have increased human comforts and happiness. The first thing that man learnt to do was to Conquer Nature. He can now sail the vast oceans fly in the air travel underground and do a lot more things. Inventions like the telephone mobile computer etc. have changed mans forever. There have been inventions and discoveries in all aspects of life. Science has worked greater miracles in the field of health and medicine. Science has been the greatest weapon in Mans battle against diseases of various kinds. Technology is on a rise everyday. Each new day brings better technology with it. So we can say that science is a boon to human life.

Explanation:

......

Answer:

The science which has been of such great assistance to mankind

has another face too. There is evidently a drastic change in the

lives we are leading today and that we had some years ago.

Science which has bestowed us with development, progress,

expansion and growth has also rendered us with hostilities,

violence, ruin, devastation and bloodshed. George Bernard Shaw

has rightly said

“Science… never solves a problem without creating ten more.”

Gone is the age of steam. We are now in the age of hydrogen

bombs and electricity. The most fantastic dreams of HG Wells in

his novel: “The Dream” have come true. In this space age, where

the wonders of science excel the wonders of nature, science

affects our day-to-day life. Science has surpassed the old cobwebs

of mythology and yesterday’s faith has proved to be today’s

superstition in the crucible of science.

Yet the problem is whether science is a boon or bane to society.

Science nurtures intelligence but leaves the will and emotions

uncared for. As Helen Keller has quoted

“Science may have found a cure for most evils, but it has found no

remedy for the worst of them all- the apathy of human beings.”

Science triumphs in automating processes but now it reigns over

man. Automation is the order of the day. The specter of war and

destruction haunts the world and nobody is safe. Controlling

scientific knowledge with moral judgement may be a solution to

this dilemma. Audio-visual appliances annihilate times and

distances. But more valuable than these concrete achievements is

the spirit of science. Science means systematised knowledge. It

finds the causes of phenomena, and works through observation

and experiments. Science is the torch-bearer of the civilisation.

Is science really a bane? As religion is a Matter of Faith, in the

same way science is a Matter of Fact. Modern warfares are

destructive beyond the wildest dreams of our unscientific

predecessors. Machine guns, shells, submarines, the atom

hydrogen bombs and nuclear weapons can destroy the world in the

twinkling of an eye. Aeroplanes in war act as engines of mass

destruction. Not only in times of war but in times of peace also

man lives in the midst of diseases. Through cures are being

invented, diseases are multiplying too.

Man has manipulated deserts, hills, mountains, oceans, ice

covered regions, all of them, in accordance with his needs; and

has exploited animals to their extinction. Man has constructed

whole new islands for himself; but global warming is a big threat to

the already existing lands. Man has invented radiations and lasers

only to prove harmful to human body than being beneficial. Science

has made modern man’s life simpler but has loaded it with huge

tensions and threats.

Science is the greatest blessing that man could ever receive. It is

indeed a boon and a blessing, if used for the benefit of mankind

and for constructive purposes unless it becomes a tool in the hand

of a few selfish and evil-minded people. When used as a weapon

to destroy, create fear, spread violence and annihilate people, then

science becomes a double-edged sword destroying even the

perpetrator. It is thus in our hands to make science a blessing for

humanity or to convert it into a curse, a bane and destroy even the

footprints of mankind on this planet.

you can pick from any of those point since they are much. please rate it 5 stars and Mark as brainliest

Answer:

Option D. Al is above H on the activity series.

Explanation:

The equation for the reaction is given below:

2Al + 6HBr —> 2AlBr₃ + 3H₂

The activity series gives us a background understanding of the reactivity of elements i.e how elements displace other elements when present in solution.

From the activity series of metals, we understood that metal higher in the series will displace those lower in the series.

Considering the equation given above, Al is higher than H in the activity series. Thus, the reaction will proceed as illustrated by the equation.

Therefore, we can conclude that the reaction will only occur if Al is higher than H in the activity series.

ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.  Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials.

Remember that when a metal reacts with a nonmetal, often an ionic compound results from the transfer of electrons form the metal (the reductant) towards the nonmetal (the oxidant). Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials. They melt at rather high temperatures and are not easily distorted.   ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.

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Answer:

Explanation:

From the given information:

The energy of photons can be determined by using the formula:

\(E = \dfrac{hc}{\lambda}\)

where;

planck's constant (h) = \(6.63 \times 10^ {-34}\)

speed oflight (c) = \(3.0 \times 10^8 \ m/s\)

wavelength λ = 58.4 nm

\(E = \dfrac{6.63 \times 10^{-34} \ J.s \times 3.0 \times 10^8 \ m/s}{58.4 \times 10^{-9 } \ m}\)

\(E =0.34 \times 10^{-17} \ J\)

\(E = 3.40 \times 10^{-18 } \ J\)

To convert the energy of photon to (eV), we have:

\(1 eV = 1.602 \times 10^{-19} \ J\)

Hence

\(3.40 \times 10^{-18 } \ J = \dfrac{1 eV}{1.602 \times 10^{-19 } \ J }\times 3.40 \times 10^{-18 } \ J\)

\(E = 2.12 \times 10 \ eV\)

E = 21.2 eV

b)

The equation that illustrates the process relating to the first ionization is:

\(Hg_{(g)} \to Hg^+ _{(g)} + e^-\)

c)

The 1st ionization energy (I.E) of Hg can be calculated as follows:

Recall that:

I.E  = Initial energy - Kinetic Energy

I₁ (eV) = 21.2 eV - 10.75 eV

I₁ (eV) = 10.45 eV

Since ;

\(1 eV = 1.602 \times 10^{-19} \ J\)

∴

\(10.45 \ eV = \dfrac{1.602 \times 10^{-19 } \ J }{ 1 \ eV}\times 10.45 \ eV\)

Hence; the 1st ionization energy of Hg atom = \(1.67 \times 10^{-18} \ J\)

\(1.67 \times 10^{-21} \ kJ\)

Finally;

\(I_1 \ of \ the \ Hg (kJ/mol) = \dfrac{1.67 \times 10^{-21 \ kJ} \times 6.02 \times 10^{23} \ Hg \ atom }{1 \ Kg \ atom }\)

\(\mathbf{= 1.005 \times 10^3 \ kJ/mol}\)

a. Moles of oxygen reacted = 0.469 moles

b. Moles of iron that must react = 0.625 moles

c. Moles of product formed = 0.313 moles

d. mass of product formed = 50.08 g

a. The moles of oxygen is calculated as follows:

Moles = mass/molar mass

Molar mass of oxygen = 32.0 g/mol

Moles of oxygen = 15/32

Moles of oxygen = 0.469 moles

b. Moles of irons that must react is obtained from the mole ratio of iron and oxygen

Mole ratio of iron to oxygen is 4 : 3

Moles of iron that must react = 4/3 * 0.469

Moles of iron that must react = 0.625 moles

c. Moles of product formed is obtained from the mole ratio of product and oxygen

Moles of product formed = 2/3 * 0.469

Moles of product formed = 0.313 moles

d. mass of product formed = moles * molar mass

Molar mass of product = 160 g/mol

mass of product formed = 160 * 0.313

mass of product formed = 50.08 g

In conclusion, the mass of product formed is determined from the moles of products formed.

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Note that the complete question is as follows:

consider the reaction of 15.0 g of oxygen as follows:

4Fe + 3O2 —> 2Fe2O3

How many moles of oxygen react?

How many moles of iron must react?

How many moles of product form?

What mass of product forms?

Answer:

only certain wavelengths of the light can be absorbed.

There are no transitions in the hydrogen atom that corresponds to the wavelength of yellow or orange light.

Each color corresponds to a particular wavelength. The wavelengths that are observed for a given atom depends on the transitions that are possible for electrons of the atom.

In the hydrogen atom, there is no transition whose wavelength corresponds to the wavelength of yellow or orange light. None of the lines in the hydrogen spectrum has such wavelength.

For instance, yellow light corresponds to 590 nm - 560 nm but this wavelength is missing from the spectrum of hydrogen(crosscheck in the image attached).

As such, we do not see yellow or orange lights in the hydrogen spectrum.

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Mesosaurus lived in freshwater lakes and ponds. Elongated and slim, it measured about 3.3 feet long. The skull and tail were both long and narrow, and the animal probably undulated through the water as it fed on small crustaceans and other prey with its jaws, which were full of long, thin, pointed teeth.

We can be able to determine the amount of toxic lead in the water by thee use of  atomic absorption spectrophotometry.

A toxic metal is known as any metal that is able to affect the health of people. We know that toxic metals are mostly the metals that are in the group of the heavy metals.

Now we know lead as a metal that is able to cause brain damage especially in children. This is why it is very important that there should be a thorough examination in order to know the amount of lead that is present in water.

There are several methods that could be applied in the determination of lead and one of the most common methods is by the use of atomic absorption spectrophotometry which is able to detect even the minutest amount of the led in solution.

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1) Note that Tectonic plate interactions cause geological events. Convection currents in the Earth's mantle drive plate movements and create divergent, convergent, and transform boundaries. The movement creates earthquakes, volcanic eruptions, and mountain formations. The type of boundary determines the type of geological event that occurs.

2) One example of a geological event caused by tectonic plate interactions is the Pacific Ring of Fire. The Ring of Fire is a string of active volcanoes and seismic activity that encircles the Pacific Ocean.

Geological events are natural occurrences that result from the movements and interactions of tectonic plates, driven by convection currents in the Earth's mantle.

These events include earthquakes, volcanic eruptions, and mountain building and can have significant impacts on the Earth's surface and its inhabitants. Some examples of geological events include volcanic eruptions, earthquakes, tsunamis, and mountain building.

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Answer: 1:1

Explanation:

Since Na trades place with Na it makes it 1:1

volume of solution = 750 mL = 0.750 L

mass of solute = 21.04 g

solute: NaCl

molarity

Step 1: Calculate the molar mass of solute.

molar mass of solute = (22.99 g/mol × 1) + (35.45 g/mol × 1)

molar mass of solute = 58.44 g/mol

Step 2: Calculate the number of moles of solute.

moles of solute = mass of solute / molar mass of solute

moles of solute = 21.04 g / 58.44 g/mol

moles of solute = 0.360027 mol

Step 3: Calculate the molarity.

molarity = moles of solute / volume of solution

molarity = 0.360027 mol / 0.750 L

molarity = 0.48 mol/L

B. 0.48 mol/L

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Answer:

the answer is D . water

Explanation:

the others are organic molecules

The m/z that can be seen in propan - 1 ol but not propan - 2 ol is m/z = 15

The distribution of ions produced by a sample in a mass spectrometer is depicted graphically as the mass spectrum.  A sample is ionized in a mass spectrometer, where the resultant ions are sorted according to their m/z ratio.

Each peak in the mass spectrum corresponds to a certain m/z ratio and represents one of the several ions that the sample produced. Thus the propan - 1 ol has the m/z = 15

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Answer:

yes u are correct as it define that

Answer:

Explanation:

count given by old sample = .97 disintegrations per minute per gram

count given by fresh sample = 6.68 disintegrations per minute per gram

Half life of radioactive carbon = 5568 years

rate of disintegration

dN / dt = λ N

In other words rate of disintegration is proportional to no of radioactive atoms present . As number reduces rate also reduces .

Let initial no of radioactive be N₀ and after time t , number reduces to N

N₀ / N = 6.68 / .97

Now

\(N=N_0e^{-\lambda t}\)

\(\frac{N}{N_0} =e^{-\lambda t}\)

\(\frac{6.68}{.97} = e^{\lambda t}\)

λ is disintegration constant

λ = .693 / half life

= .693 / 5568

= .00012446 year⁻¹

Putting the values in the equation above

\(\frac{6.68}{.97} = e^{.00012446\times t}\)

\(6.8866 = e^{.00012446\times t}\)

1.929577 = .00012446 t

t = 15503.6 years .  

Option D. MgCl2 would have the smallest difference between experimental and ideal van 't Hoff factors. The answer is D.

The van 't Hoff factor (I) is a proportion of the degree of separation of a solute in an answer. The ideal van 't Hoff factor (I) accepts total separation, while the exploratory van 't Hoff calculate considers any deviation from this suspicion. The level of deviation is subject to elements like the size and charge of the particles. The ionic sweep and charge of the particles increment as we drop down and to one side on the occasional table. Accordingly, the littlest contrast between the exploratory and ideal van 't Hoff variables would be normal for the compound with the littlest particles and charges, which would be MgCl2. Thus, the response is D.

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Sunlight, wind, and water are considered renewable resources

Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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The mass of sodium bicarbonate containing 6.52 kg of Na would be 30.04 kg.

Sodium carbonate contains sodium and carbonate according to the following equation:

\(NaHCO_3 --- > Na + HCO_3^-\)

From the equation, 1 mole of sodium bicarbonate requires 1 mole of sodium. By this ratio, the mass of sodium bicarbonate containing 6.52 kg of sodium can be calculated from the number of moles.

Recall that: mole = mass/molar mass

6.52 kg sodium = 6.52 x 1000

                          = 6520 grams

Mole of 6520 grams sodium = 6520/23

                                               = 283.48 moles

From the mole of sodium, the equivalent mole of sodium bicarbonate can be derived as:

283.48 x1 = 283.48 moles of sodium carbonate.

Mass of the sodium carbonate = 283.48 x 106

                                                   = 130048.88 grams

Converted to kg = 130048.88/1000

                            = 30.04 kg

Thus, the mass of sodium bicarbonate containing 6.52 kg of sodium would be 30.04 kg.

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The concentration of lead in the solution is 4.8 ppm.

The ppm (parts per million) is a unit used to express the concentration of a solution. It is defined as the number of parts (by mass) of a solute per million parts (by mass) of the solution. To convert from grams per 100 grams to ppm, we can use the following formula:

ppm = (mass of solute/mass of solution) x 10^6

In this case, the mass of solute (lead) is 0.00048 g, and the mass of solution is 100. g. Plugging these values into the formula, we get:

ppm = (0.00048/100) x 10^6

ppm = 4.8

Therefore, the concentration of lead in the solution is 4.8 ppm.

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Based on the balanced chemical equation, the theoretical yield of MgO is equal to the amount of Mg used in the reaction.

In this lab, we used stoichiometry to determine the theoretical yield of MgO that could be produced from a given amount of Mg.

If a company is producing MgO with the same cost of materials as in this lab and is averaging a 92 percent yield, we can compare the actual yield of MgO they are producing to the theoretical yield we calculated in this lab to determine if their process is efficient.

Let's say the company uses 10 grams of Mg in their production process. Based on our calculations from the lab, the theoretical yield of MgO would be 13.12 grams. If the company is averaging a 92 percent yield, this means they are producing:

0.92 x  13.12 = 12.06 grams of MgO.

To determine if the company should continue their process or update, we need to compare the actual yield of MgO they are producing (12.06 grams) to the theoretical yield we calculated in the lab (13.12 grams). The actual yield is about 92% of the theoretical yield, which is close but slightly lower.

If the company can improve their process to increase the yield closer to the theoretical yield, they may be able to produce more MgO with the same amount of Mg and cost of materials. However, if the cost of updating the process exceeds the potential benefits of increasing the yield, it may not be worth it for the company to update their process.

In summary, based on the information provided, I would recommend that the company continue their process but consider ways to improve their yield if possible. It would also be important to consider the costs and benefits of updating their process before making any changes.

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Answer:

B - convergent destructive (subduction)

Explanation:

option A is not a plate boundary. A constructive plate boundary moves away from eachother and a convergent collision boundary would suggest no slipping whereas a convergent destructive boundary has subduction take place which is when a denser plate slips under a less dense plate.

Answer: A

Explanation:

Answer:

Answer:

K2MnF6 + 2SbF5 = 2KSbF6 + MnF3 + 1/2 F2

Explanation:

k =2( both sides)

Mn = 1( both sieds)

Sb = 2( both sides)

F =16( both sides)

Balanced