Please help…. I don’t get any of this :(

Answer: The answer is protons + neutrons!

Explanation: mass number = protons + neutrons.

Have a great day!

They feature glass or metal stems and are liquid-filled thermometers. The colored liquid inside the stem expands and rises as the food's internal temperature rises, providing a scale-based indication of the temperature. False high readings can occur as a result of heat conduction in the metal stems.

To learn more about thermometers refer to:

https://brainly.com/question/2339046

#SPJ4

From the periodic table, we can find the molar mass and the molecular formula. Option C.

We can see that we can be able to locate several elements in the periodic table. In the periodic table of the elements, the elements can be classified in groups and periods.

The groups tell us the number of the valence electrons that we can be able to find in the atom that we are looking at. Now we know that the valency of iron and chlorine can be read off from the periodic table as well as the masses of the elements and this can help us to find the molar mass and the molecular formula.

Learn more about periodic table:https://brainly.com/question/11155928

#SPJ1

Mole fraction of methanol is equal to moles of methanol divided by moles of glycerine. = 4.05 mol / (4.05 mol + 0.2555 mol). = 0.941.

We must first determine how many moles of methanol are present in the solution. The molar mass of methanol (32.04 g/mol) is used for this. 130 g / 32.04 g/mol equals 4.05 moles. Calculating the amount of glycerine in the solution is also necessary. The molar mass of glycerine (92.09 g/mol) is used for this. 23.5g/92.09g/mol is 0.2555 moles. The number of moles of a component divided by the total number of moles in the solution yields the mole fraction of that component. Mole fraction of methanol is equal to moles of methanol divided by moles of glycerine. = 4.05 mol / (4.05 mol + 0.2555 mol). = 0.941.

Learn more about The molar mass of methanol here:

https://brainly.com/question/30312187

#SPJ4

The density of the rock calculated by using the density formulas is 0.625 kg/m^3.

To find the density of the rock, we need to divide its mass by its volume. The equation for density is:

Density = Mass / Volume

We are given the mass of the rock as 2.5 kg and the volume as 4000 mL. To use these units in the equation, we will need to convert the volume from milliliters to cubic meters.

1mL = 0.001 m^3

So, 4000 mL = 4 m^3

Then, we can substitute these values into the equation and solve for density:

Density = 2.5 kg / 4 m^3 = 0.625 kg/m^3

For more questions like Density click the link below:

https://brainly.com/question/29775886

#SPJ4

H2O2 is a polar molecule. The oxygen atoms in H2O2 have a partial negative charge, while the hydrogen atoms have a partial positive charge, giving it a dipole moment and making it polar.

H2O2 is a molecule that contains two oxygen atoms and two hydrogen atoms. The chemical formula of H2O2 is H-O-O-H. The two oxygen atoms in the molecule are bonded together by a covalent bond, and each oxygen atom is bonded to a hydrogen atom by a covalent bond.

Due to the presence of two oxygen atoms in the molecule, the H2O2 molecule has a polar nature.

This is because oxygen atoms are more electronegative than hydrogen atoms, which means that the oxygen atoms will have a stronger pull on the electrons in the covalent bonds.

This causes the electrons in the covalent bonds between the oxygen atoms and the hydrogen atoms to be unevenly distributed, giving the molecule a partial negative charge on the oxygen atoms and a partial positive charge on the hydrogen atoms. This uneven distribution of electrons creates a dipole moment in the molecule, making it polar.

In summary, a molecule's polarity is determined by the difference in electronegativity of its constituent atoms and the molecular shape. In the case of H2O2, the molecule is polar due to the difference in electronegativity between the oxygen atoms and the hydrogen atoms, which causes an uneven distribution of electrons in the molecule and a dipole moment.

Learn more about H2O2:

https://brainly.com/question/30076652

#SPJ4

The mass of moles of H₂O (water) = 18.02 grams.

The method the mass of any molecule, formula unit, or ion is equal to the sum of the average atomic masses of all the atoms in its formula.

H's average atomic mass is 1.01 amu.

O's average atomic mass is 16.00 amu.

Hence,

2 H atoms = 1.01 amu / 1 H atom = 2.02 amu

1 O atoms = 16.00 amu / 1 O atom = 16 amu

2.02 amu + 16 amu = 18.02 amu

So, the mass of moles of H₂O (water) =  18.02 amu = 18.02 grams.

Learn more about moles of H₂O here: https://brainly.com/question/30219139

#SPJ4

One mole of calcium carbonate reacts with 2 moles of HCl forms one mole of calcium chloride, water and carbon dioxide each. The theoretical yield of calcium chloride from 16.5 g of calcium carbonate is 18.3 g.

Theoretical yield of a reaction is the amount of product that is calculated theoretically calculated based on the balanced chemical equation.

The balanced equation of the reaction between calcium carbonate and HCl is given as follows:

[tex]\rm CaCO_{3} + 2HCl \rightarrow CaCl_{2} + CO_{2} + H_{2}O[/tex]

Molar mass of calcium carbonate = 100 g/mol

molar mass of calcium chloride = 111 g/mol

Hence, 100 g of calcium carbonate produce 111 g of calcium chloride. Then, mass of calcium chloride from 16.5 g is:

(111× 16.5) /100 = 18.3 g.

Therefore, the theoretical yield of the reaction is 18.3 g of calcium chloride.

Find more on theoretical yield:

https://brainly.com/question/11002641

#SPJ1

Answer: All of the nonmetals are found to the right side of the zigzag line!

Explanation:

The little yellow highlighted zig-zag line separates the metals from the non-metals, the nonmetals can be found to the right of the line!!

A) have lower melting points. Compared with solid ionic compounds, solid molecular compounds generally have lower melting points.

Ionic compounds are held together by the electrostatic attraction between positively and negatively charged ions, while molecular compounds are held together by weaker van der Waals forces between neutral molecules. The strong electrostatic forces in ionic compounds give them high melting and boiling points, while the weaker intermolecular forces in molecular compounds result in lower melting and boiling points. Due to this reason, solid molecular compounds generally have lower melting points than solid ionic compounds. The strong ionic bonds in ionic compounds require more energy to overcome in order to melt or boil the compound, while the weaker intermolecular forces in molecular compounds are easier to overcome.

learn more about compounds here:

brainly.com/question/14658388

#SPJ4

The last third-party candidate to win one or more states was George Wallace of the American Independent Party in 1968.

Who was George Wallace?

To know more about George Wallace, click the link given below:

https://brainly.com/question/480072

#SPJ4

Answer:

2 atoms of Hydrogen and 1 atom of Oxygen comprises to form the water molecule. To show the two atoms of Hydrogen we use subscript 2.

Explanation:

(⁠◕⁠ᴗ⁠◕⁠✿⁠)(⁠◕⁠ᴗ⁠◕⁠✿⁠)(⁠◕⁠ᴗ⁠◕⁠✿⁠)

Hey there!

Answer:

Platinum (Pt) is the element in group 10, period 6, on the Periodic Table with the atomic number 78. The element is a heavy, malleable, ductile, grey-white transition metal, used in various ways.

Hope this helps! If you make Brainliest, TYSM! :D

A 30 mL sample of an ideal gas experiences a continuous pressure increase as the temperature rises from 400 K to 1600 K. The new volume exists 0.015 L.

Boyle's Law is a gas law that establishes a relationship between pressure and volume of a specific quantity of gas at a fixed temperature.

According to the statement, "The volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure," the volume falls and grows as the pressure changes.

Boyle's law is expressed mathematically as:

Pressure × Volume = constant

or PV = k

If a change in pressure or volume occurs at a constant temperature, the following is true:

P1 × V1 = P2 × V2

The pressure and volume in state 1 are P1 and V1, while the pressure and volume in state 2 are P2 and V2.

In other words, the final pressure divided by the final volume is equal to the product of the starting pressure and the original volume.

P1 = 101.3 kPa = 101,300 Pa (being 1 kPa = 1,000 Pa)

V1 = 30 mL = 0.03 L (1 L = 1,000 mL)

P2 = 202.6 kPa = 202,600 Pa

101,300 Pa × 0.03 L=202,600 Pa × V2

simplifying the above equation we get

[tex]$& V 2=\frac{101,300 P a * 0.03 \mathrm{~L}}{202,600 P a} \\[/tex]

V 2 = 0.015 L

The new volume is 0.015 L.

The complete question is:

The pressure on 30 milliliter of an ideal gas increases from 101.3 kPa to 202.6 kPa at constant temperature. What is the new volume?

To learn more about Boyle's Law refer to:

https://brainly.com/question/1696010

#SPJ1

The standard enthalpy of combustion is ΔHcombustion = ΔHf(products) - ΔHf(reactants) = -6353.8 kJ/mol - (-2218.2 kJ/mol) = -4135.6 kJ/mol.

To learn more about standard enthalpy refer:

brainly.com/question/4767461

#SPJ4

Energy consumption in the cloud refers to the amount of energy used by data centers and other infrastructure that provide cloud computing services.

This includes the energy used to power servers, cooling systems, and networking equipment, as well as the energy used to transport data over networks.

As cloud computing has become increasingly popular, energy consumption has become a significant concern for both cloud providers and users, as the energy required to run data centers can be substantial. To mitigate this, cloud providers are investing in more energy-efficient technologies and practices, such as using renewable energy sources and implementing more efficient cooling systems.

Learn more about cloud computing:
https://brainly.com/question/29737287

#SPJ4

One lithium cation Li+ and one chlorine anion Cl- combine to form the molecule. Lithium chloride has a molar mass of 42.39 g/m.

A chemical is what?

A type of matter that has a consistent chemical composition and recognizable properties is referred to as a chemical substance.

A chemical substance cannot be physically separated into its component parts, that is, without rupturing the chemical bonds, according to some.

Simple substances (substances made up of just one chemical element), chemical compounds, and alloys are all examples of chemicals.

Any material with a known composition is considered to be a chemical. So a chemical always contains the same "stuff," to put it another way. Natural substances like water contain certain chemicals. There are also manufactured chemicals like chlorine, which is used in swimming pools or to bleach fabrics.

To know more about chemical, click the link given below:

brainly.com/question/13145357

#SPJ1

Iron(II) iodide will precipitate when solutions of iron(ii) acetate, fe(c2h3o2)2, and potassium iodide (ki) are mixed.

Define precipitate.

Precipitate is a solid that is created when a solution changes, frequently as a result of a chemical reaction or a shift in temperature that makes a solid less soluble. A precipitate in meteorology is either liquid or solid water.

Fe(C 2H 3O 2) 2 + KI → K(C 2H 3O 2 ) 2 + FeI 2

An insoluble substance that separates from a liquid solution is referred to as a precipitate. Precipitation is the process through which an insoluble solid emerges from a solution.

The inorganic substance iron(II) iodide has the formula FeI2. In organic processes, it serves as a catalyst. Iron (II) iodide is thought to be insoluble in aqueous solutions. We can categorize it as a precipitation reaction because of this.

To learn more about precipitation reaction use link below:

https://brainly.com/question/13016165

#SPJ4

This is a homogeneous mixture. A homogeneous mixture is a mixture in which the components are evenly distributed throughout the mixture, meaning that all parts of the mixture have the same composition.

In this case, the oil and vinegar are mixed together in a blender until a smooth consistency is formed. This means that the oil and vinegar are evenly distributed throughout the mixture, creating a uniform composition throughout the entire mixture.

This is different from a heterogeneous mixture, in which the components are not evenly distributed, resulting in a mixture that has different compositions in different parts. For example, a salad with mixed greens, cherry tomatoes, cucumbers, and croutons is a heterogeneous mixture, as the ingredients are not evenly distributed throughout the salad.

PCl5 is a polar molecule. In order to determine whether a molecule is polar or nonpolar, we need to consider the arrangement of atoms within the molecule and the electron-pair geometry.

PCl5 is a symmetric molecule; it has a trigonal bipyramidal shape, which is characterized by the presence of five chlorine atoms around the central phosphorus atom. However, the electron-pair geometry around the phosphorus atom is only tetrahedral. This is because one of the pairs of electrons on the phosphorus atom is involved in forming a bond with a chlorine atom.

The symmetry of the molecule and the difference in electronegativity between the phosphorus and chlorine atoms result in a polar molecule. The chlorine atoms pull the electrons in the covalent bonds towards themselves, creating a partial negative charge on the chlorine atoms and a partial positive charge on the phosphorus atom. The net dipole moment of PCl5 is not zero, which confirms the polarity of the molecule.

In summary, PCl5 is a polar molecule due to the difference in electronegativity between the phosphorus and chlorine atoms and the asymmetry of the molecule. The electrons are pulled towards the chlorine atoms, creating a partial positive charge on the phosphorus atom and a partial negative charge on the chlorine atoms.

Learn more about PCl5:

https://brainly.com/question/16232825

#SPJ4

There are 1.5055 x10²⁴ molecules in 2. 5 mol of O₂

To determine the total number of atoms or molecules in the sample, multiply the number of moles by Avogadro's constant. The formula is:

number of molecule= moles x avogadro's number

The same amount of different gases measured at the same pressure and temperature each have the same number of molecules, one mole of matter has 6.022 x 10²³ atoms.

number of molecule= moles x avogadro's number

number of molecule= 2. 5 mol x  6.022x10²³

number of molecule= 1.5055 x10²⁴

Therefore, there are 1.5055 x10²⁴ molecules in 2. 5 mol of O₂

Learn more about number of molecule at brainly.com/question/29769911

#SPJ4

The characteristics of cathode rays depend on the material from which they are emitted is the false statement concerning cathode rays. The correct answert is E.

These are the traits of cathode rays:

Learn more about cathode ray at https://brainly.com/question/13665271

#SPJ4

The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.

What is a micropipette?

A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.

Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.

Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.

It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.

Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.

To learn more about a micropipette from the given link:

brainly.com/question/28425080

#SPJ4

Fermentation does not require oxygen as it is an anaerobic process. If oxygen is present, pyruvate will be completely oxidized to water and carbon dioxide molecules by some yeast species spiration. On the other hand, yeast species will produce ethanol only in an anaerobic environment by a process called Pasteur Effect.

Fermentation  is a process of energy production in cells with a state anaerobic (without oxygen) that produces changes in organic biochemistry through the action of enzymes. Fermentation is a form of anaerobic respiration in general, but there is a more precise definition that defines fermentation as respiration in an anaerobic environment without the presence of an external electron acceptor. Examples of fermentation can be found in bread making, wine (beer) and cheese making.

Sugar is a common ingredient in fermentation. Some examples of fermented products are ethanol, lactic acid and hydrogen. However, several other components can also be produced from fermentation, such as butyric acid and acetone. Yeast is a common fermenting agent used to produce ethanol in beer, wine, and other alcoholic beverages. Anaerobic respiration (without external electron acceptor) in mammalian muscles during hard work can be classified as a form of fermentation which produces lactic acid as a by-product. This accumulation of lactic acid can cause muscle fatigue.

Learn more about fermentation at https://brainly.com/question/13050729.

#SPJ4

There are two molecules of oxygen (O2) in one molecule of O2.

Oxygen (O2) is a molecule made up of two atoms of oxygen. These atoms are bonded together using a covalent bond, which means they share electrons. The molecular formula of O2 is O2, which means that there are two atoms of oxygen in one molecule of O2.

Because of this, there are a total of 2 oxygen atoms and 2 molecules of O2. Oxygen is a colorless, odorless, and tasteless gas that is essential for life and is found in the Earth's atmosphere. It is also used in many industrial processes, such as combustion and respiration, and is a key component of the Earth's carbon cycle.

Learn more about O2:
https://brainly.com/question/22415789

#SPJ4

An atom's radius is well under 1 nanometer, or one billionth of a meter.

To learn more about atom refer to :

https://brainly.com/question/17545314

#SPJ4

Answer: heat resistant

Boron oxide is added to glass during the manufacturing process, it causes the glass to have a blue tint, increases its strength, and makes it more resistant to breaking and shattering, also increases the heat resistance of glass and makes it more flexible, allowing it to be bent without breaking.

The mass of chlorine that is needed to convert 100g of sodium hydroxide solution into bleach is 88.75 g.

The mass of chlorine that is needed to convert 100g of sodium hydroxide solution into bleach is determined from the equation of the reaction g9ven below:

2 NaOH + Cl₂ ---> NaCl + NaClO + H₂O

Based on the chemical equation, we need 2 moles of Sodium Hydroxide for every mole of Chlorine.

Molar mass of NaOH = 40 g/mol

Molar mass of Cl₂ = 71.0 g/mol

Mass of chlorine required = 100/40 * 1/2 * 71

Mass of chlorine required = 88.75 g of chlorine

Learn more about sodium hydroxide and bleach at: https://brainly.com/question/15981862

#SPJ1

Since beryllium only possesses two valence electrons, exchanging electrons is often not how an octet rule is formed. Two solitary covalent bonds between the elements beryllium and hydride (BeH2) make up the Lewis structure of the gaseous compound.

Dots are used to represent the three pairs of unpaired electrons on chlorine. It only has three pairs of electrons in the valence shell of boron. Because some atoms do not have full octets, molecules like BeCl2 and BCl3 are referred to as electron deficient.

It is known that beryllium can form compounds in which it is encircled by less than eight electrons. This is an acceptable solution because B Sulfur can hold more than an octet.

To know more about octet rule visit:-

https://brainly.com/question/865531

#SPJ1