what is the empirical formula of stannous fluoride, the first fluoride compound added to toothpaste to protect teeth against decay? its mass percent composition is 24.25% ff , 75.75% snsn .

The percentage abundance of lithium-7 in nature is 92.5%

Based on the information in the table, the average atomic mass of the element is 32.06 and the element X is sulfur.

The percentage abundance of lithium-7 is calculated below as follows;

average atomic mass = sum of the product of the percentage abundance and isotopic mass of each isotope

Let the percentage abundance of lithium-7 be x; the percentage abundance of lithium-6 will be 1 - x

6.941 = 6.015 * (1 - x) + 7.016 * x

6.941 = 6.015 - 6.015x + 7.016 x

x = 0.925 or 92.5%

The average atomic mass of X will be:

The average atomic mass of X = (31.97 * 94.93) + (32.97 * 0.76%) + (33.97 * 4.29%) + (35.97 * 0.02%)

The average atomic mass of X = 32.06

X is sulfur

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Sea surface temperatures will rise. More heat energy will emerge from this, increasing the likelihood that tropical cyclones may form. Floods and cyclones worsen as a result of increased evaporation and heavy precipitation brought on by warming are the short term effects of climate change

Short-term climatic changes also include those brought on by the ocean and atmosphere interacting. Seasons. Because the amount of solar energy received by Earth at various latitudes varies throughout the year, seasons develop. Climate all throughout the world are impacted by these changes in wind, current, and ocean temperature. Changes often last a year or two, while climate refers to the area's typical long-term weather patterns. The average weather for a specific area and time period, often averaged over a 30-year period, is how some scientists describe climate. Sea surface temperatures will rise. More heat energy will emerge from this, increasing the likelihood that tropical cyclones may form. Warming also causes increased evaporation, which increases the frequency of heavy rain and snowfalls and causes floods.

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Short term of effects of climate change includes the rise in temperature, increased warmth of Water, expansion of ocean, heavy rains, floods and severe storms.

A relatively brief occurrence or its repercussions are referred to as short term effects. The short term effects of climate change includes the following,

The waters will warm as the temperature rises. More heat energy will be produced as a result, which will boost the likelihood that tropical cyclones will form. The global surface temperature increases along together the concentrations of greenhouse gas.

Most of the temperature from global warming is absorbed by the ocean. All ocean depths have experienced a significant increase in ocean warming during the past 20 years. Water expands as it becomes warmer, therefore as the ocean warms, so does its volume.

In many areas, destructive storms have increased in ferocity and frequency. More moisture evaporates as temperatures rise, aggravating extremely heavy rains and flooding and resulting in more severe storms.

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Answer:

write the following as fractions in their simplest form

Answer:

A calculator has an endifiite shape because all of its atoms are touching each other

Answer:

The volume that a 200 g gold sample would have is 10.36 mL.

Step-by-step explanation:

In this case it is known that the density of gold is 19.3 g / mL. This indicates that in 1 mL there are 19.3 g. Then the following rule of three can be applied: if 19.3 g is contained in 1 mL, how much volume is 200 g of gold?

volume= 10.36 mL

Answer:

Igneous

Explanation:

During alpha decay, the atomic number of the radioactive isotope reduces by 2 unit and mass number decreases by four units. In beta decay, the mass number remains unchanged and the atomic number increases by one.

Heavy unstable radioactive isotopes undergoes nuclear decay through the emission of charged particles such as alpha or beta. In alpha decay, the radioactive isotope emits an alpha particle or helium nuclei.

consider the general equation for alpha decay:

\(\rm _{Z}^{A}X \rightarrow _{Z-2}^{A-4}X + _{2}^{4}He\)

Hence, the mass number of the product reduces by 4 units and atomic number by 2 units.

In beta decay, one or more beta particles or an electron is emitted results in increase in atomic number by one unit and mass remains constant.

The general  nuclear reaction of beta decay is written as follows:

\(\rm _{Z}^{A}X \rightarrow _{Z +1}^{A}X + _{-1}^{0}e\)

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The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

Answer:

4. 1.5moles

5. 0.405moles

6. 1 mol

Explanation:

To find the number of moles in each susbtance in this question, we divide each number of atom/molecule measurement by Avagadro's number (6.02 × 10^23 atoms)

That is; nA = n × 6.02 × 10^23 atoms

n = nA ÷ 6.02 × 10^23 atoms

Where;

nA = number of atoms

n = number of moles

4.) n of Carbon = 9.03 x 10^23 ÷ 6.02 × 10^23

n = 1.5 × 10^ (23-23)

n = 1.5 × 10^0

n = 1.5 × 1

n = 1.5moles.

5.) n of H2O = 2.44 x 10^23 ÷ 6.02 × 10^23

n = 0.405 × 10^ (23-23)

n = 0.405 × 10^0

n = 0.405moles

6.) n of lithium = 6.02 x 10^23 Li atoms ÷ 6.02 × 10^23

n = 1 × 10^ (23-23)

n = 1 × 10^0

n = 1 mol

Explanation:

protons and neutrons have approximately the same size, the electron is 1847th, (I think), the size of a proton

The subatomic particles which are having approximately the same mass are neutrons and protons. Thus, option c is correct.

An atom is made of subatomic particles namely neutrons, protons and electrons. The neutrons and protons are located inside the nucleus whereas, the electrons are revolving around the nucleus through circular paths definite energy.

The electrons are having negative charges and protons are of positive charge. For a neutral atom the number of electrons and protons are equal. Electrons have negligible mass.

The mass of an atom is mainly contributed by the nucleus. The mass of neutrons and protons are have approximately same mass. Therefore, option c is correct.

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Answer:

the answer is D

Explanation:

i hope it's rite.

Answer: C. UVA rays cause premature aging and UVB rays cause burning

Explanation: Ultraviolet radiation causes DNA changes in the skin, leading to premature aging and skin cancer. There are three kinds of UV light: UVA light. This form of solar radiation damages skin at all levels—from the surface layer (epidermis) down deep into the dermis.

Answer:

Greatly affected.

Explanation:

The stability of a nucleus is greatly affected by changing the number of nuclear particles because changing the number of nuclear particles i.e. neutron or proton will leads to change the element. When we change the number of protons in an atom, we will change the atom from one element to a different element. Sometimes, when you add a proton to an element, the element will become radioactive in nature so we can conclude that changing number of nuclear particles impact the stability of nucleus of an atom.

Answer:

a

Explanation:

The overall equation is \(C_2H_4 + H_2 ---- > C_2H_6\).

A chemical equation is defined as a symbolic representation of a chemical reaction in the form of symbols and formulas, in which reactant elements are given on the left and product units on the right.

For example,

\(NaOH+ HCl ---- > NaCl+ H_2O\)

In this, reactants are converted to products which is symbolized by a chemical equation. For example, iron (Fe) and sulfur (S) combine to form iron sulfide (FeS).

Fe(s) + S(s) → FeS(s)

here, the plus sign indicates that iron reacts with sulfur.

Thus, the overall equation is \(C_2H_4 + H_2 ---- > C_2H_6\).

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Answer:

boiling is the temperature something is before it starts to evaporate into the air.

Explanation:

Answer:

Although all organic compounds contain carbon, and almost all have hydrogen, most of them contain other elements as well. The most common other elements in organic compounds are oxygen, nitrogen, sulfur, and the halogens.

Explanation:

I hope this helped!

Answer:

Fe (s) + Cu^2+ (aq) + SO4^2- (aq) --> Cu (s) + Fe^2+ (aq) + SO4^2- (aq)

Explanation:

Answer:

true

Explanation:

This canyon is an example of how the surface of Earth changes slowly due to the slow and gradual process of erosion by water and wind.

The slow and gradual process of erosion by water and wind is responsible for the slow change in the surface of Earth demonstrated by the canyon.

The canyon demonstrates how the surface of Earth changes slowly due to the process of erosion by water and canyon, which gradually wear away the rock and reshape the landscape over millions of years.

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Explanation:

From periodic table:  

Zn = 65.38    gm/mole         X 3 =196.14  

P= 30.974

O = 15.999                           X 4 =63.996

Total mole wt = 291.11  gm     of which  196.14 is Zn

196.14 / 291.11 x 100% = 67% Zn

(NOTE that the sample mass of 25.5 g is irrelevant)

The periodic table with masses is very useful as the atomic mass is the average number of protons and neutrons in atoms of a chemical elements, which allows for the natural abundances of the element's isotopes.

Generally, atomic mass of an element is defined as the number of times an atom of that element which is heavier than an atom of carbon taken as 12. Basically, one atomic mass unit is equal to one-twelfth of the mass of an atom of carbon 12 isotope.

In the modern periodic table atomic number is present at the upper left, or number of protons. And in the middle the letter is the symbol used for the element (e.g., H). And below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. Finally at the very bottom is the name of the element (e.g., hydrogen).

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Answer:

i think the answer is D)

but u should ask the another person too:)

1. The reaction between sodium and chlorine gas to form sodium chloride is a synthesis reaction (S).

In a synthesis reaction, two or more substances combine to form a single product. In this case, sodium (Na) and chlorine gas (Cl2) react to produce sodium chloride (NaCl). The balanced chemical equation for this reaction is 2Na + Cl2 → 2NaCl.

2. The decomposition of potassium chlorate to form potassium chloride and oxygen gas is a decomposition reaction (D).

In a decomposition reaction, a single compound breaks down into two or more simpler substances. In this case, potassium chlorate (KClO3) decomposes to yield potassium chloride (KCl) and oxygen gas (O2). The balanced chemical equation for this reaction is 2KClO3 → 2KCl + 3O2.

3. The reaction between sulfuric acid and potassium hydroxide to form water and potassium sulfate is a double replacement reaction (DR).

In a double replacement reaction, the positive and negative ions of two compounds switch places to form two new compounds. In this case, sulfuric acid (H2SO4) reacts with potassium hydroxide (KOH) to produce water (H2O) and potassium sulfate (K2SO4). The balanced chemical equation for this reaction is H2SO4 + 2KOH → 2H2O + K2SO4.

4. The reaction between hydrogen gas and silver oxide to form water and silver is a single replacement reaction (SR).

In a single replacement reaction, an element replaces another element in a compound. In this case, hydrogen gas (H2) reacts with silver oxide (Ag2O) to produce water (H2O) and silver (Ag). The balanced chemical equation for this reaction is H2 + Ag2O → H2O + 2Ag.

5. The reaction between nitrogen gas and hydrogen gas to form ammonia (NH3) is a synthesis reaction (S).

In this synthesis reaction, nitrogen gas (N2) and hydrogen gas (H2) combine to produce ammonia (NH3). The balanced chemical equation for this reaction is N2 + 3H2 → 2NH3.

In summary, the reactions can be classified as follows:

1. Synthesis reaction (S)

2. Decomposition reaction (D)

3. Double replacement reaction (DR)

4. Single replacement reaction (SR)

5. Synthesis reaction (S)

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Answer:

There are 1.4754246675000002e+24 atoms of Hydrogen within the measurement of 2.45 moles of hydrogen!

Explanation:

Answer with Explanation:

The units used to express the densities of gases are different from those of solids and liquids because the particles in gas are widely separated from each other, unlike the particles in solid and liquid which are almost the same. The particles in solid are very close together. Considering it melts (if it's an ice), it will turn into a liquid and the change in volume is slightly greater only. However, if the liquid evaporates and transitions into a gas, the volume becomes largely different from its solid and liquid state. This is because the particles are much farther apart and free to move.

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.

Answer:

Obtain the relative numbers of atoms of each element in the compound by dividing the number of moles of each element in the 100 g sample by the number of moles of the element present in the smallest amount.