Express the following number in scientific notation.
0.026890 =

The correct answer is C. Atoms are made up of smaller particles.

Explanation:

John Dalton was an English chemist and physicist mainly known for proposing one of the first formal theories related to atoms by the end of the 19th century. In this theory, Dalton explained atoms were the basic unit for all elements and cannot be divided into smaller participles, also he proposed atoms of the same elements are identical including their masses and those of different elements are different. This means the statement that is not part of Dalton's atomic theory is "Atoms are made up of smaller particles" because for Dalton atoms are the smallest unit and cannot be divided into smaller parts, this was proved as false later as they can be divided into sub-particles.

Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells. They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism.

Enzymes lower the activation energy level of a chemical reaction, thus making it so the reaction will proceed.

Enzymes are proteins that help speed up chemical reactions in our bodies.

Enzymes are proteins that speed up the rate of a chemical reaction without being used up during the reaction.

They are biological catalysts. Catalysts, as we know lower the activation energy for reactions and speed them up.

The lower the activation energy for a reaction, the faster the rate.

Thus enzymes speed up reactions by lowering the activation energy.

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Answer: 32/16S which is sulfur

The isotopes that carry the exact same number of neutrons as they are in phosphorous-31 would be:

32/16S

Thus, 32/16S is the correct answer.

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Answer:

= 51.57 °C

Explanation:

The combined gas equation shows that P₁V₁/T₁=P₂V₂/T₂ where P represents pressure, V represents volume and T absolute temperature

From the information provided in the question,

Since we are finding the initial or original temperature, we can make T₁ the subject of the formula.

T₁=P₁V₁T₂/P₂V₂

P₁=2.0 ATM

P₂= 1.0 ATM

V₁=2.0 L

V₂= 3.5 L

T₁=?

T₂= (11+273) K=284 K

Using these values in the formula:

T₁= (2.0 ATM × 2.0 L× 284 K)/(1.0 ATM × 3.5 L)

=324.57 K

324.57-273= 51.57 °C

C) It goes up by one

Answer:

True

Explanation:

Ice floats on water, for water is more dense than ice, allowing water to "support" the ice on top.

Iron nail, on the other hand, is more dense than water, allowing the nail to sink.

Answer: True an iron nail is more dense than the water and Ice the ice is less dense than the water making it float. Hopes this helps :)

Answer:

B) H2O

Explanation:

Compound is a pure substance composed of two or more different atoms chemically bonded to one another. Among all choices only H₂O is composed of two atoms, and other choices are composed of only one atom.  H₂O is the pure substance composed of chemically bonded two atoms (hydrogen atoms and oxygen atom).

Answer:

H₂O

Explanation:

Compound consists of combinations of elements. H (Hydrogen) is an element. O-16 and H-3 are stable isotopes of O (Oxygen) and H (Hydrogen), which are elements. H₂O is compound formed by two elements: Hydrogen and Oxygen.

Answer: 1A: F, 2A: T, 3A: F

Explanation: 1A: Science impacts our everyday life in many ways, from the technology we use to text and call, to the medicine we take for headaches and allergies! There are many brances of science that you can specialize in, whether it be studies space or animals!

2A: Scientists are problem solvers, which means they have to be creative.

3A: Everyone is capable of thinking scientifically!

Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form. Water vapour in the atmosphere is often below its boiling point. When water is boiled the water evaporates much faster and makes steam.

Both vapor and gas contains the gaseous molecules. But vapor state contains a second phase too along with gas whereas, gaseous state only contain one component.

Vapor is a state of matter consists of two component. Solid and gas  or liquid and gas. Thus vapor is formed when a gas comes in contact with liquid or solid.

There forms an equilibrium between gaseous state and liquid or solid state. For example water forms water vapor when the liquid water boils to form gases, similarly other liquids such as acids forms their vapor.

Gases such as oxygen, hydrogen, nitrogen etc.  forms only gases and thus have only one component. Thus we used to say nitrogen gas, hydrogen gas etc.

Therefore, vapor is a combination of two states and gas in a single state. Water forms vapor and can be called water vapor but nitrogen is called gas only.

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To calculate the heat absorbed by the water, we use the formula Q = mcΔT, where Q represents the heat energy absorbed, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Substituting the given values, we find that approximately 136,872 joules of heat are absorbed to raise the water's temperature from 25°C to 100°C.

This question is asking how much heat energy, in joules, is required to heat 435 grams of water from 25°C to 100°C at atmospheric pressure. The formula used to calculate this is Q = mcΔT, where Q represents the heat energy absorbed, m is the mass of the substance (water), c is the specific heat capacity, and ΔT is the change in temperature.

For water, the specific heat capacity (c) is 4.184 J/g°C. The mass (m) of the water is given as 435 g. The change in temperature (ΔT) is the final temperature minus the initial temperature, which is 100°C - 25°C = 75°C.

Substituting these values into the equation gives us, Q = (435 g) × (4.184 J/g°C) × (75°C), which equals approximately 136,872 joules. This is amount of heat absorbed by the water to raise its temperature from 25°C to 100°C at 1 atm.

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Answer:

[tex]\boxed{3.966 \times 10^{24}\text{ atoms of Ag}}[/tex]

Explanation:

(a) Balanced equation

Cu + 2AgNO₃ ⟶ Cu(NO₃)₂+ 2Ag

(b) Calculation

You want to convert atoms of Cu to atoms of Ag.

The atomic ratio is ratio is 2 atoms Ag:1 atom Cu

[tex]\text{Atoms of Ag} = 19.83 \times 10^{23}\text{atoms Cu} \times \dfrac{\text{2 atoms Ag}}{\text{1 atom Cu}}\\\\= 3.966 \times 10^{24}\text{ atoms of Ag}\\\\\text{The reaction will produce }\boxed{\mathbf{3.966 \times 10^{24}}\textbf{ atoms of Ag}}[/tex]

Answer:

[tex]3.966\times 10^{24} [/tex] pure silver atoms are produced.

Explanation:

[tex]1 mol = N_A=6.022\times 10^{23} mol^{-1}[/tex]

Atoms of copper = [tex]19.83\times 10^{23} [/tex]

Moles of copper = [tex]\frac{19.83\times 10^{23} }{N_A}[/tex]

[tex]=\frac{19.83\times 10^{23} }{6.022\times 10^{23} mol^{-1}}=3.293 mol[/tex]

[tex]Cu + 2AgNO_3\rightarrow Cu(NO_3)_2 + 2Ag[/tex]

According to reaction, 1 mol of copper atoms gives 2 moles of silver atoms.

Then 3.293 moles of moles of copper will give:

[tex]\frac{2}{1}\times 3.293 mol=6.586 mol[/tex]

Number of silver atoms in 6.586 moles of silver:

=[tex]6.586 mol\times 6.022\times 10^{23} mol^{-1}=3.966\times 10^{24} atoms [/tex]

Answer:

d. synthesis

Explanation:

it uses the formula a+b=ab.

Answer:

synthesis

Explanation:

A + B → AB

A simple example of a synthesis reaction is the formation of water from its elements, hydrogen, and oxygen:

2 H2(g) + O2(g) → 2 H2O(g)

Answer:

iron n chlorine

Explanation:

Answer:

The compound FeCl3 is made of IRON AND AND CHLORINE

Answer:

a.

Explanation:

Answer:

The air pressure in the bottle will change.

Explanation:

According to Gay-Lussac's Law, one of the main gas laws, the pressure of gas is directly proportional to the temperature of the gas. This means that as the temperature of the gas increases, the pressure of the gas will increase as well. Therefore, if you heat a closed bottle, the air pressure inside the bottle will change (increase).

The mass of aluminum supplied to given quantity of heat in order to increase its temperature is 146.9 g.

The given parameters;

The mass of aluminum is calculated as follows;

Q = mcΔt

where;

[tex]m = \frac{Q}{c \Delta t} \\\\m = \frac{8750}{0.9025 \times 66} \\\\m = 146.9 \ g[/tex]

Thus, the mass of aluminum supplied to given quantity of heat in order to increase its temperature is 146.9 g.

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Answer:the empirical formula is C3H8O2

Explanation:

You need to determine the relative number of moles of hydrogen and carbon. So you first calculate the molar mass of CO2 and H20 Atomic weight of carbon = 12.0107 Atomic weight of hydrogen = 1.00794 Atomic weight of oxygen = 15.999 Molar mass CO2 = 12.0107 + 2 * 15.999 = 44.0087 Molar mass H2O = 2 * 1.00794 + 15.999 = 18.01488 Now calculate the number of moles of CO2 and H2O you have Moles CO2 = 2.086 g / 44.0087 g/mole = 0.0474 mole Moles H2O = 1.134 g / 18.01488 g/mole = 0.062948 mole Calculate the number of moles of carbon and hydrogen you have. Since there's 1 carbon atom per CO2 molecule, the number of moles of carbon is the same as the number of moles of CO2. But since there's 2 hydrogen atoms per molecule of H2O, The number of moles of hydrogen is double the number of moles of H2O Moles Carbon = 0.0474 Moles Hydrogen = 0.062948 * 2 = 0.125896 Now we need to determine how much oxygen is in the compound. Just take the mass of the compound and subtract the mass of carbon and hydrogen. What's left will be the mass of oxygen. Then divide that mass by the atomic weight of oxygen to get the number of moles of oxygen we have. 1.200 - 0.0474 * 12.0107 - 0.125896 * 1.00794 = 0.503797 Moles oxygen = 0.503797 / 15.999 = 0.031489 So now we have a ratio of carbon:hydrogen:oxygen of 0.0474 : 0.125896 : 0.031489 We need to find a ratio of small integers that's close to that ratio. Start by dividing everything by 0.031489 (selected because it's the smallest value) getting 1.505288 : 3.998095 : 1 The 1 for oxygen and the 3.998095 for hydrogen look close enough. But the 1.505288 for carbon doesn't work. But it looks like if we double all the numbers, we'll get something close to an integer for everything. So do so. 3.010575 : 7.996189 : 2 Now this looks good. Rounding everything to an integer gives us 3 : 8 : 2 So the empirical formula is C3H8O2

Answer:

nglos324 - fe3c. Iron carbide is an interstitial compound of iron and carbon with the composition Fe- 6.68 wt % Carbon. It is a brittle ceramic material and is produced in carbon steels or cast irons during pseudo-equilibrium cooling from above the eutectoid temperature (723 C).

Explanation:

An atom becomes an ion to achieve electrical stability. This can occur either by the atom losing electrons and becoming a cation (positive ion), or gaining electrons and becoming an anion (negative ion). This process, known as ionization, typically happens during chemical reactions.

An atom may become an ion in pursuit of electrical stability. Atoms are originally neutral, containing equal numbers of protons (positive charge) and electrons (negative charge). Certain atoms become more stable by gaining or losing electrons, altering the balance between protons and electrons and creating a net charge, thereby becoming ions.

There are two types of ions: cations and anions. Cations are positive ions that form when an atom loses electrons. For instance, a sodium atom (Na) could lose one electron to become a cation (Na+). On the other hand, anions are negative ions formed when an atom gains electrons. For example, an oxygen atom could gain two electrons to become an anion (O2-).

The process where an atom gains or loses electrons to form ions is known as ionization. This atomic transformation usually occurs during chemical reactions, especially in the formation of ionic bonds.

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Answer:

²³⁵₉₂U

Explanation:

Properly writing the equation we have:

       ²³⁹₉₄Pu → ᵃₙX + ⁴₂He

The unknown atom here is X with mass number "a'' and atomic number ''n''

In balancing chemical equations, the mass number and atomic number must be conserved. This implies that the sum of atomic numbers i.e subscript on the left hand side must be equal to that on the right hand side. Also, the sum of the mass numbers i.e superscript on the left hand side must be equal to that on the right hand side.

For the mass numbers:

       239 = a + 4

      a = 239 - 4 = 235

For atomic numbers:

     94 = n + 2

      n = 94 -2 = 92

The atom X, has a mass number of 235 and an atomic number of 92.

This is can be written as ²³⁵₉₂X

This is option 3

Answer:

Some scientists hypothesize that Earth's ozone layer is being damaged by chlorofluorocarbons .

Explanation:

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Answer:

chlorofluorocarbons

Intermolecular forces in solids are strongest than in liquids and gases. Gases have the least strong intermolecular forces. Intermolecular forces are weak and are significant over short distances between molecules (determined by Coulomb’s law). The farther away from the molecules the weaker the intermolecular forces. Since molecules in solids are the closest, the intermolecular force between them as the strongest. Conversely, since gas molecules are farthest apart, the intermolecular forces between them are the weakest.

The strength of intermolecular forces varies in solids, liquids, and gases. They are strongest in solids, due to which molecules or atoms are tightly packed. In gases, they are the weakest, allowing for a greater separation of atoms or molecules. Certain factors like the size and identity of the molecules also influence these forces.

Intermolecular forces refer to the attractions between molecules, which determine many of the physical properties of a substance. In solids, liquids, and gases, the strength of these forces varies significantly. In gases, the atoms and molecules are more separated, and intermolecular forces can be almost ignored. On the other hand, in liquids, these forces are strong enough to keep the molecules in contact, but not to prevent them from moving past each other. However, in solids, the intermolecular forces are so strong that the molecules or atoms are tightly packed, making them resistant to changing their shape or volume.

It's important to note that larger and heavier atoms and molecules exhibit stronger dispersion forces (a type of intermolecular force) than smaller and lighter ones. Hence, molecules like F2 and Cl2 are gases at room temperature indicating weaker intermolecular forces, while Br2 is a liquid, and I2 is a solid, representing stronger intermolecular forces. The identity of the molecules also determines the type and strength of the intermolecular attractions possible. Thus, strong intermolecular forces impede vaporization and favor the 'recapture' of gas-phase molecules, resulting in a lower vapor pressure, and vice versa.

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Answer:

Single-replacement

Explanation:

The reaction is [tex]Zn + CuCl_{2}[/tex] → [tex]Cu + ZnCl_{2}[/tex] is a kind of single displacement reaction.

In a single-displacement reaction, sometimes referred to as a single replacement reaction but rather an exchange reaction, one element in a compound would be swapped out for another.

When  one reacts with another kind of element the  it will form different kind of atom or compound is referred as reaction.

The reaction is [tex]Zn + CuCl_{2}[/tex] → [tex]Cu + ZnCl_{2}[/tex] is a kind of single displacement reaction.

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Answer:

They are all made of carbon

Explanation:

Diamond, graphite, and fullerenes are all made of carbon.

Hope this helps!

Diamond, graphite, and fullerenes "Are all made of carbon".

The crystal structure known as diamond cubic would be used to describe the solid form of something like the element carbon known as diamond.

Due to its resemblance to the appearance of a soccer ball, fullerenes with a spherical shape are frequently described as "buckyballs" or Buckminster fullerenes.

Therefore, the correct answer is an option (A)

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Answer:  None of the given options .

Explanation:  The chemical formula of Iron (II) hydroxide can be written as

Fe (OH)2

As iron is present in its +2 state and hyrdoxide ion has charge of one negative unit .

Thus iron hydroxide can be written as the above and none of the given options is correct.

Answer:

two oxygen atoms covalently bonded to a single carbon atom.

Explanation:

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Answer:

Carbon, and two Oxygen atoms

Explanation:

CO2, or Carbon Dioxide is made up of one Carbon (C) atom, and two Oxygen (O) atoms.

Answer:

organism, organ system, organ, tissue, cell

Explanation:

D

I got ir right:)

Answer:

The balance between intermolecular forces and kinetic energy

Explanation:

If the kinetic energies of the particles are not strong enough to overcome the intermolecular forces, the particles will be locked in place in a crystal lattice. The substance will be a solid.

If the kinetic energies of the particles are slightly stronger than the intermolecular forces, the particles will be able to slide past each other. The substance will be a liquid.

If the kinetic energies of the particles are much stronger than the intermolecular forces, the particles will be escape completely from the attractions of their neighbours. The substance will be a gas.

The balance between intermolecular forces and kinetic energy. thus option D is correct.

Kinetic energy, form of energy that an object or a particle has by reason of its motion.

If the kinetic energies of the particles are not strong enough to overcome the intermolecular forces, the particles will be locked in place in a crystal lattice. The substance will be a solid.

If the kinetic energies of the particles are slightly stronger than the intermolecular forces, the particles will be able to slide past each other. The substance will be a liquid.

If the kinetic energies of the particles are much stronger than the intermolecular forces, the particles will be escape completely from the attractions of their neighbours. The substance will be a gas.

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Answer:

8.69 mol.

Explanation:

where, P is the pressure of the gas in atm (P = 11.0 atm).

V is the volume of the gas in L (V = 12.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 185.0 K).

∴ n = PV/RT = (11.0 atm)(12.0 L)/(0.0821 L.atm/mol.K)(185.0 K) = 8.69 mol.

Answer:

[tex]\boxed{\text{SnBr}_{4}}[/tex]

Explanation:

The name tells you that this is a binary compound (contains two elements).

It contains a metal and a nonmetal, so it is a binary ionic compound. The general rule is:

Name of compound = name of metal  name of ion (two words)

Name of metal = tin(IV), so the tin ion has a charge of 4+

Name of ion = bromide. Br is in Group 17, so bromide ion has charge of 1-.

[tex]\rm Sn$^{4+}$ + 4Br$^{-} \longrightarrow \,$ SnBr$_{4}$\\\\\text{The formula is} \boxed{\textbf{SnBr}_{4}}[/tex]