100
Continue reflecting on managing the effects of tropical cyclones by a
the phrases below:
I have learned that the Philippine Area of Responsibility
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration
The Philippines is prone to typhoons because
You can trace the path of typhoons using
You will then understand that landmasses and bodies of
water affect the intensity of typhoons causing it to increase when
and decrease when
We should stay informed about the weather. Public Storm Warning Signals indicate
The higher the PSWS, the
the damage felt. Hazards that may
accompany tropical cyclones are
But tropical cyclones also have benefits, such as
Great work! Now that you know more about the effect of typhoons, you can
ssen the damages by knowing what to do. Answer the next activity, to eva
nowledge on precautionary measures to lessen the risk brought about by
10​

The molality of the solution is 0.00037 m.

The term concentration refers to the amount of solute in a solution.

We have the following information;

Molarity = 0.335 M

Density =  1.0432 g/mL

Temperature = 20 o C

The molality of the solution is obtained from;

m = 0.335 M ×  1.0432 g/mL/ 1000(1.0432 g/mL) - 0.335 M (342 g/mol)

m = 0.344/1043.2 - 114.57

m =  0.344/928.63

m = 0.00037 m

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Answer:

There will be 2 asymmetric carbons

Explanation:

2,3,4 trichloropentane 2,4 cetre are chiral but 3

rd

centre is pseudo chiral. It depends on the configuration of 2 & 4 so, the statement is false.

solution

The mass of sulfur dioxide required is approximately 6.36 grams.

To determine the number of grams of sulfur dioxide (SO2) required to exert a pressure of 0.705 atm in a 2.50L tank at 0 °C, we can use the ideal gas law equation: PV = nRT.

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15, so the temperature becomes 273.15 K. The ideal gas constant (R) is 0.0821 L·atm/(mol·K).Rearranging the ideal gas law equation to solve for the number of moles (n), we get n = PV / RT.

Plugging in the given values, n = (0.705 atm) * (2.50 L) / [(0.0821 L·atm/(mol·K)) * (273.15 K)]. Calculating this expression, we find that n is approximately 0.0993 moles.The molar mass of sulfur dioxide is 64.06 g/mol (32.06 g/mol for sulfur + 2 * 16.00 g/mol for oxygen).

Finally, we can calculate the mass of sulfur dioxide using the formula: mass = n * molar mass = 0.0993 moles * 64.06 g/mol. Thus, the mass of sulfur dioxide required is approximately 6.36 grams.

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The empirical formula gives us the smallest ratio between the elements of a compound. In this case, we can still find the empirical formula, because you can divide 4 and 10 by 2.

So:

4/2 = 2

10/2 = 5

The empirical formula for this compound is P2O5.

Answer: alternative "B" False

a. The Mass of water driven off = 0.15 g

b. Moles of anhydrate = 0.00257 moles

c. Moles of water driven off is 0.00833 moles

d. There are 3 moles of water within the crystalline structure of one molecule of the hydrated salt.

e. The molecular formula of the hydrated salt will be X.3H₂O

a. The mass of water driven off from the hydrated salt is:

Mass of water driven off = 0.5 g - 0.35 g

Mass of water driven off = 0.15 g

b. Molecular mass of salt = 136 g/mol

moles of anhydrate = 0.35/136

Moles of anhydrate = 0.00257 moles

c. Moles of water driven off = mass/molar mass

molar mass of water = 18 g/mol

Moles of water driven off = 0.15/18

Moles of water driven off = 0.00833 moles

d. Moles of water within the crystalline structure of one molecule of the hydrated salt is determined by converting to whole number mole ratio by dividing with the smallest ratio,

Salt to water ratio = 0.00257 /0.00257  :  0.00833/0.00257

Salt to water ratio = 1 : 3

Therefore, there are 3 moles of water within the crystalline structure of one molecule of the hydrated salt.

e. Assuming the anhydrous salt is X, the molecular formula of the hydrated salt will be X.3H₂O

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The answer is c and possibly a I don't know why im here i dont know what this is so bye...

Explanation:

C I hope this is right for your question.

Answer:

Science textbooks around the world have become suddenly out of date. Four new chemical elements have been added to the periodic table. A big decision now lies ahead - elements 113, 115, 117 and 118 need to be given their official names and symbols.

New elements can be named after a mythological concept, a mineral, a place or country, a property or a scientist. The names have to be unique and maintain "historical and chemical consistency" . This means a lot of "-iums".

"They're Latinising the name," explains chemist Andrea Sella of University College London. "The most recent tradition has been to name them after places or after people." The places chosen tend to be where the element was discovered or first manufactured. The Swedish village of Ytterby has managed to get four named after it (ytterbium, yttrium, erbium and terbium).

No-one has yet named an element after themselves but many elements are named in tribute to important scientists. Albert Einstein was given einsteinium. This can also be a way of righting the wrongs of the past. "Lise Meitner was really the chemist who spotted nuclear fission but she was never really recognised for it because she was Jewish and a woman," says Sella. "To be able to give an element a name that reminds us of her is I think greatly important."

The naming process isn't quick. The scientists who discovered them will start things off by proposing a name. But it will be down to the International Union of Pure and Applied Chemistry (IUPAC) to approve it. A special division of the US-based group has to accept the proposal. There is then a public review period of five months before the IUPAC council gets the final approval. Once it's ready, the name is announced in the scientific journal Pure and Applied Chemistry .

Scientists sometimes get creative. Mythical names have proved popular. Promethium was named after a character from a Greek legend who stole fire from the gods to give to humans and was punished by being chained to rock so an eagle could feed on his liver. The name was meant to reflect the fact that synthesising new elements often requires sacrifice.

There is hidden meaning in the table - as in the naming of praseodymium and neodymium. They replaced didymium - wrongly thought to be an element but in fact a mixture of the two. "The reason I like them is because they're called the green twin and the new twin," says Sella. "Didymium was named after [the Greek for] twin but in fact it also means testicles."

Naming an element is not just about functionality. "There's a tremendous romance to this," he adds. "Names are always important."

Answer:

Enzyme mutations can lead to serious or fatal human disorders and are the consequence of inherited abnormalities in the affected individual's DNA. The mutation may be at a specific position in an enzyme encoded by a mutated gene, just like a single abnormal amino acid residue.

Explanation:

Answer:

Vomiting, headaches, wooziness, blurred vision, and even liver injury are side effects of vitamin A. Vitamin D - Tiredness, headache, sickness, and vomiting. Vitamin C: Heartburn, diarrhea, vomiting, and nausea.

Yes, excessive amounts of some types of vitamin A can be dangerous. A strong headache, blurred vision, nausea, dizziness, muscular aches, and issues with coordination can result from taking too much preformed vitamin A, which is typically found in supplements or some medications.

Poisonous Substance. Any component in a multivitamin supplement can be toxic in large doses, but iron or calcium pose the biggest threat. Large or toxic doses of calcium, vitamin D, and vitamin A carry additional dangers.

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Answer:

Guys’ search it up on math thank me later

Explanation:

dhsjdjsusysgtjghtd fjfhfhcchdh

3.99 g of Fe₂S₃ solid product can be made from the given amount of FeCl₃.

A balanced equation for the reaction is:

FeCl₃ (aq) + 3Na₂S (aq) → Fe₂S₃ (s) + 6NaCl (aq)

In the stoichiometry of the reaction, 1 mole of FeCl₃ reacts with 1/3 moles of Fe₂S₃, or that 3 moles of FeCl₃ react with 1 mole of Fe₂S₃.

Moles of FeCl₃ = mass / molar mass

Moles of FeCl₃ = 9.34 g / 162.2 g/mol

Moles of FeCl₃ = 0.0575 mol

Since the reaction uses 3 moles of FeCl₃ to produce 1 mole of Fe₂S₃,

Moles of Fe₂S₃ = (0.0575 mol FeCl₃) / 3

= 0.0192 mol Fe₂S₃

Mass of Fe₂S₃ = moles × molar mass

Mass of Fe₂S₃ = 0.0192 mol × 207.9 g/mol

Mass of Fe₂S₃ = 3.99 g

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One liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is hydrochloric acid (HCl). Hydrochloric acid is a strong acid commonly used in laboratories for various purposes, including cleaning and dissolving mineral deposits.

When dry mortar, which is primarily composed of cement, hardens on floor tiles, it can be challenging to remove using traditional cleaning methods. However, hydrochloric acid can effectively dissolve and break down the cementitious components of the mortar.

It is important to note that when using hydrochloric acid, proper safety precautions should be followed, such as wearing protective gloves, goggles, and working in a well-ventilated area.

Additionally, it is crucial to dilute the hydrochloric acid to an appropriate concentration for the specific task, as using it undiluted can cause damage to the tiles or other surfaces.

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Answer:

Nucleus, Endoplasmic Reticulum, Ribsome

Explanation:

I tried my best

The molecules that are polar among the given options are as follows:

NBr₃

CH₃Cl

Polar molecules are formed when one end of the molecule is said to possess more positive charges and whereas the opposite end of the molecule has negative charges, creating an electrical pole.

In polar molecules, the distribution of electrons between the covalently bonded atoms is not even.

The N–Br bond in NBr₃ is polar because the electrons that are shared between the two atoms are concentrated in the Br atom.

CH₃Cl is polar because the C-Cl bond is polar, the CH₃Cl has a net dipole, so CH₃Cl is polar.

PCl₅, CH₄, N₂ are said to be non polar because, as a bond is formed between the two atoms, there is no difference in their electronegativity and the net dipole moment becomes zero.

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Answer:

To resolve this, we need to place the coefficient “2” in front of the sodium in the reactant, to give the equation shown below. 2 Na (s) + Cl 2 (g) → 2 NaCl (s) In this equation, there are two sodiums in the reactants, two sodiums in the products, two chlorines in the reactants and two chlorines in the products; the equation is now balanced.

Explanation:

The mass of P-32 remaining after 27 days, if the initial mass is 40g is 10.5 g.

The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.

The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.

The number of half lives in 27 days;

n = 27 days/14 days

n = 1.929

The mass of P-32 remaining after 27 days, if the initial mass is 40g;

mass remaining = 40 g / (2^1.929)

mass remaining = 40 g / 3.808

mass remaining = 10.5 g

Thus, the mass of P-32 remaining after 27 days, if the initial mass is 40g is 10.5 g.

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Answer:

Explanation:

if it has a lower density than the liquid it's in will float

The variable "air pressure inside the football" in this experiment is quantitative and dependent variable. Hence, option D is correct.

The dependent variable is the variable that is being measured or tested in an experiment.

In the experiment, the scientist filled the footballs with fix quantity of pressure which was then kept for 12 hours. After 12 hours the pressure inside the footballs was again measured. Pressure here is a quantitative variable.

Since the air temperature is an independent variable. The pressure being the dependent variable depends upon the temperature of the air.

Independent variable; The variable which does not depends upon any other variable.

Dependent variable; The variable which depends upon the independent variable or varies with the change independent variable.

Qualitative variables are variables which cannot be expressed in form of numbers. They generally convey the characteristic, category, quality or type.

Whereas Quantitative variables are the variables which can be expressed in the form of numbers. These are the variables which exist along the continuous sequence.

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The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

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Answer:

Q = 1.5 kJ

Explanation:

It is given that,

The specific heat for aluminum is 0.900 J/g°C

Mass of sample, m = 3.8 g

Initial temperature, \(T_i=450^{\circ} C\)

Final temperature, \(T_f=25^{\circ} C\)

We need to find the heat released. The amount of heat released is given by the formula:

\(Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\Q=3.8\times 0.9\times (25-450)\\\\Q=1453.5\ J\\\\Q=1.45\ kJ\)

or

\(Q=1.5\ kJ\)

So, the correct option is (A) i.e. 1.5 kJ.

The formula to find the mass in grams is =  number of moles × Molecular mass

A mole is defined as 6.02214076 × 1023 of the chemical unit, be it atoms, molecules, ions, or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others that are present in any substance.

To find number of moles we use the formula that is weight divided by molecular mass

From this we can find out the mass as well;

Mass = Number of moles × Molecular mass

Mass = 3.6 × 98.070 ⇒ 353.08 grams

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A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.

We must compute the empirical formula in order to ascertain the compound's chemical composition.

If we have 100 grams of the compound.

This suggests we have:

30.4 g of nitrogen

69.6 g of oxygen

Now, we have to convert the mass of each element to moles.

The molar mass of nitrogen (N) = 14.01 g/mol

the molar mass of oxygen (O)  =  16.00 g/mol.

Number of moles of nitrogen (N):

2.17 mol

Number of moles of oxygen (O):

4.35 mol

The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.

Moles N / moles O = 2.17 mol / 2.17 mol = 1.00

Moles O / moles O = 4.35 mol / 2.17 mol = 2.00

The ratio is approximately N₁O₂.

We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.

The molecular formula of the compound is NO₂.

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Answer:

D. 5.35 g NaF.

Explanation:

Hello!

In this case, given the chemical reaction, whereas there is a 2:2 mole ratio between NaF and NaBr, we can compute the moles of NaF product by firstly computing the moles of NaBr in 550 and secondly using the mole ratio as shown below:

\(n_{NaF}=550gNaBr*\frac{1molNaBr}{102.89gNaBr}*\frac{2molNaF}{2molNaBr} \\\\n_{NaF}=5.35molNaF\)

Therefore, the answer is D. 5.35 g NaF.

Best regards!