Borus Mendeleev is credited as being the primary creator of the first version of the
periodic table of elements.

a. True

b. False

Answer:

Metals ionize by electron gain, non-metals ionize by electron loss while metalloids possess properties of both metals and non-metals

Explanation:

Explanation:

In chemistry, accuracy refers to how close a measurement is to its standard or known value. ... Precision refers to how close two or more measurements are to each other, regardless of whether those measurements are accurate or not. It is possible for measurements to be precise but not accurate.

In chemistry, precision is the consistency of repeated measurements under unchanged conditions, reflecting the reliability of data. Precise measurements are critical for reproducibility and may inform on the purity of substances, illustrating a substance's homogeneous nature.

In chemistry, precision refers to how closely a measurement matches the same measurement when it is repeated under unchanged conditions. It is an indication of the consistency among a set of results. Precision is essential in chemistry because it ensures that experiments and measurements can be reproduced, which is a fundamental aspect of the scientific method. The precision of a measuring tool is also dependent on the size of its measurement increments; smaller increments generally allow for more precise measurements.

When considering both accuracy and precision, a set of measurements can be precise without being accurate and vice versa. For example, if a series of measurements are close to each other but far from the known or accepted value, they are precise but not accurate. Conversely, a single measurement can be accurate if it is close to the known value, even if it is not repeated to assess precision.

The concepts of precision and purity are also related in chemistry. A pure substance is a homogeneous substance that has a constant composition. Having precise measurements helps chemists in determining the purity of substances, as consistent properties and measurements suggest that a substance is pure and not contaminated with other materials.

Answer:

twins

Explanation:

twins are genetically identical

Answer:

1.69×10^25 grams

Explanation:

First convert molecules to moles and then convert moles to grams by multiplying by the molar mass which is 28.0g and you get this answer!!

Hope this is right

Answer:

The object will move to the right .

Explanation:

The force in the right side of the object is 20N  which is more than the force of any other side according to the given question.

   As the force in the right side of the object is greater than that of other sides the the object will move to the right.

Answer:

Bombardment by asteroids

Explanation:

All of the other ones explain themselves

Answer:

[tex]\frac{PV}{T}=k[/tex]

Explanation:

Combine Gas law is a combination of  three gas laws which are  Boyle's Law, Charles' Law, and Gay-Lussac's Law.

Combine gas law states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.

Hence the equation becomes:

[tex]\frac{PV}{T}=k[/tex]

where P = pressure,

V = volume,

T = absolute temperature,

k = constant.

Now we know that Kelvin = °Celsius + 273

For all gas law problems it is necessary to work in the Kelvin scale because temperature is in the denominator in the combined gas laws (P/T, V/T and PV/T) and can be derived in the ideal gas law to the denominator (PV/RT) . If we measured temperature in Celsius we could have a value of zero degrees Celsius and this would solve as no solution, as you cannot have zero in the denominator.

However, if we reached zero in the Kelvin scale this would be absolute zero and all matter would stop and therefore there would be no gas laws to worry about.

Answer: True

Explanation:

Photons do not have mass, so they are not considered matter. However, they do have a stationary state either, so they are not considered an object in Physics.

Answer: biotic factors or biotic factors

Explanation:

Answer:

4.08

Explanation:

Answer:

4.08

Explanation:

a . p .  e . x .

Gold cyanidation ( which is also known as the cyanide process or the MacArthur-Forrest process) is a hydro-metallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction

The MacArthur Forrest process is used for the extraction of gold. It involves the use of a weak cyanide solution to dissolve the gold from its ore, which is then separated and refined to obtain pure gold.

The MacArthur Forrest process is used for the extraction of gold.

This process, also known as the cyanide process or cyanidation, involves the use of a weak cyanide solution to dissolve the gold from its ore.

Here are the steps:

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Final Answer:

Approximately [tex]\(9.18 \times 10^{23}\)[/tex]molecules of substance B are produced when 29.3g of substance A reacts.

Explanation:

To determine the number of molecules of substance B produced when 29.3g of substance A reacts, we follow these steps:

Step 1: Convert the mass of A to moles.

Given mass of A = 29.3g

Molar mass of A = 19.2g/mol

Number of moles of A = [tex]\( \frac{{\text{{Given mass}}}}{{\text{{Molar mass}}}} \)[/tex]

[tex]\[ \text{{Moles of A}} = \frac{{29.3 \, \text{{g}}}}{{19.2 \, \text{{g/mol}}}} \][/tex]

[tex]\[ \text{{Moles of A}} \approx 1.526 \, \text{{mol}} \][/tex]

Step 2: Convert the number of moles of A to the number of moles of B.

Given chemical reaction (assuming a 1:1 ratio for simplicity):

[tex]\[ \text{{A}} \rightarrow \text{{B}} \][/tex]

Since the ratio is 1:1, moles of A equals moles of B.

[tex]\[ \text{{Moles of B}} = \text{{Moles of A}} \][/tex]

[tex]\[ \text{{Moles of B}} \approx 1.526 \, \text{{mol}} \][/tex]

Step 3: Convert the number of moles of B to molecules of B.

Avogadro's number states that 1 mole of any substance contains [tex]\(6.022 \times 10^{23}\)[/tex]  molecules.

[tex]\[ \text{{Molecules of B}} = \text{{Moles of B}} \times (6.022 \times 10^{23} \, \text{{molecules/mol}}) \][/tex]

[tex]\[ \text{{Molecules of B}} \approx 1.526 \times (6.022 \times 10^{23}) \][/tex]

[tex]\[ \text{{Molecules of B}} \approx 9.18 \times 10^{23} \, \text{{molecules}} \][/tex]

Therefore, approximately [tex]\(9.18 \times 10^{23}\)[/tex]molecules of substance B are produced when 29.3g of substance A reacts.

Answer:

c. differ in electronegativity

Explanation:

Covalent bond:

It is formed by the sharing of electron pair between bonded atoms.  

The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.

For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive . The bond is polar.

When the elctronegativity difference is 0.4 or less than 0.4 the bond is non polar.

if the electronegativity difference is greater than 0.4 the bond is polar.

A polar covalent bond is likely to form between two atoms that differ in electronegativity, resulting in an unequal sharing of electrons and a molecule with a partial negative and positive charge.

A polar covalent bond is likely to form between two atoms that c. differ in electronegativity. This is because, in a polar covalent bond, one atom has a greater attraction for the electrons than the other atom. If the relative attraction, or electronegativity, of an atom for electrons is significant enough to create an unequal sharing of electrons, the result is a polar covalent bond with one end of the bond having a slight negative charge and the other end having a slight positive charge.

For example, in a water molecule, the oxygen atom is more electronegative than the hydrogen atoms, resulting in a polar covalent bond where the shared electrons spend more time closer to the oxygen nucleus, giving it a slightly negative charge and leaving the hydrogen atoms with a slightly positive charge.

Answer:

The charge in the clouds can cause the ground to become positively charged.

Explanation:

During a thunderstorm, the important charging area is the central part or portion of the storm when air is moving in an upward direction. The temperature here ranges from -15 to -25 degree Celsius.  The ground has a slightly negative charge and when a thunderstorm comes the negative charge on the ground is repelled by the negative charge in the center of the storm. This makes the ground that is underneath the storm to become more positively charged.  

The intertidal zone  is not a zone in the three-layered structure of the ocean relating to density. Therefore, option B is correct.

The intertidal zone is the area between high and low tides where the ocean meets the land. The Monterey Bay National Marine Sanctuary's tide pool.

Intertidal zones can be found anywhere the ocean meets the land, ranging from steep, rocky ledges to long, sloping sandy beaches and mudflats that can stretch for hundreds of meters.

Population density is often measured in three different ways. There is arithmetic density, physiological density, and agricultural density.The intertidal zone is the area where the ocean and land meet. It is not a zone in the ocean's three-layered structure.

Thus, option B is correct.

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In a reaction between acetic acid (HC2H3O2) and calcium hydroxide (Ca(OH)2), the products are calcium acetate (Ca(C2H3O2)2) and water (H2O). This is a neutralization reaction resulting in the formation of a salt and water.

The reaction between acetic acid (HC2H3O2) and calcium hydroxide (Ca(OH)2) is an example of a neutralization reaction where an acid reacts with a base. In this case, acetic acid and calcium hydroxide react to form calcium acetate (Ca(C2H3O2)2) and water (H2O), which are the products of the reaction. This type of reaction involves the swap of cations and anions between the acid and the base to form the new products: water and a salt (calcium acetate in this case).

Once balanced, the chemical equation should look like this:
2 HC2H3O2(aq) + Ca(OH)2(aq) → Ca(C2H3O2)2(aq) + 2 H2O(l)

Answer:

A or first one

Explanation:

trust meeeeeee

The correct answer is C: Evaporation.

Further Explanation:

Liquids that become a gas goes through a process called evaporation. Evaporation occurs when something that is liquid heats up enough to become a gas form. The liquid is heated so quickly that the molecules in the liquid evaporate.

Condensation is the opposite of evaporation and this turns the gas into a liquid.

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Answer:

Heated water is more dense than melted snow because water as liquid is denser than ice. Ice floats on water, which means that it has less density than water. Heated water is warmer and more dense than melted ice.

Explanation:

Answer:

The over all charge on atom will be +2.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

For example

X is the element having 12 protons  10 electrons and 14 neutrons.

The number of protons and electrons are not equal which means two electrons are lose by the given atom and it is present in the form of cation.

The over all charge on atom will be +2.

Answer: gasoline

Explanation: Gasoline is a mixture of many different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins). Salt and carbon dioxide are chemical compounds, aluminium (Al) is an chemical element.

Taking into account the definition of mixture, the correct answer is second option: gasoline.

A mixture is the combination or union of two or more elements or components that can be found in any state of matter.

Mixtures can be homogeneous, where the components are united in a uniform way and are not distinguished by the naked eye, or heterogeneous, which lacks uniformity, so that the substances or elements that make up the mixture can be distinguished.

Gasoline is a combination of several liquid, volatile and flammable hydrocarbons, that is, organic compounds formed only by carbon and hydrogen, obtained by fractional distillation of petroleum to which additives are added to improve its properties.

In others words, gasoline is a homogeneous mixture of hydrocarbons which are obtained from oil.

In summary, the correct answer is second option: gasoline.

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Answer:

non-metal

Explanation:

Covalent bonds are formed when non-metal atoms are combined.

In the periodic table, that's groups 3A, 4A, 5A, 6A and 7A, all to the right of the "staircase" line.

Answer:

Synthesis

Explanation:

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

General equation;

A + B → AB

The given reaction is synthesis reaction.

Chemical equation:

2Al + Cl₂ → 2AlCl

it is also redox reaction because oxidation reduction take place.

The oxidation state of aluminium and chlorine is zero on left side while it on right side aluminium become cation with charge of +1 and chlorine become anion with a charge of -1.

Aluminium is reducing agent while chlorine is oxidizing agent.

Oxidizing agents:

Oxidizing agents oxidize the other elements and itself gets reduced.

Reducing agents:

Reducing agents reduced the other element are it self gets oxidized.

500 Joules

We are given;

We are required to calculate the work done;

Thus, in this case;

Work done = 100 N × 5 m

                  = 500 Joules

Thus, the work done in moving the box is 500 joules

Answer:

c

Explanation:

The law of conservation clearly states that energy can neither be created nor destroyed

Answer:

the answer is current curricular

Answer:

current curricular

Explanation:

Atoms form ions by gaining or losing electrons. A cation forms when an atom loses electrons, while an anion forms when an atom gains electrons. An ionic bond is formed between oppositely charged ions, while a covalent bond is formed by the sharing of electrons between atoms.

Ions are formed when atoms gain or lose electrons. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. An example of a cation is sodium (Na+), which loses one electron to form a positive ion. An example of an anion is chloride (Cl-), which gains one electron to form a negative ion.

Difference between ionic and covalent bonds:

An ionic bond is formed by the attraction between a positive ion (cation) and a negative ion (anion). These ions are held together due to the opposite charges, similar to how oppositely charged magnets stick together. A covalent bond is formed when electrons are shared between two atoms. Each atom shares one of their electrons, which then orbits the nuclei of both atoms. Covalent bonds are typically formed between nonmetal atoms.

117 mL of 0.210 M K₂S solution

Explanation:

The question asks about the volume of 0.210 M K₂S (potassium sulfide) solution required to completely react with 175 mL of 0.140 M Co(NO₃)₂ (cobalt(II) nitrate).

We have the chemical reaction:

K₂S + Co(NO₃)₂ → CoS + 2 KNO₃

molar concentration = number of moles / volume (L)

number of moles = molar concentration × volume

number of moles of Co(NO₃)₂ = 0.140 × 175 = 24.5 mmoles

We see from the chemical reaction that 1 mmole of Co(NO₃)₂ is reacting with 1 mmole of K₂S, so 24.5 mmoles of Co(NO₃)₂ are reacting with 24.5 mmoles of K₂S.

volume = number of moles / molar concentration

volume of K₂S solution = 24.5 / 0.210 = 117 mL

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Answer:

2 loss of electrons.

Explanation:

An atom of any element either metal or nonmetal form ions by losing or gaining electron. This is because protons are embedded in the nucleus with neutrons and electrons are found in different orbits surround the nucleus.

Metals have 1 or 2 or 3 electrons in their outermost shell which is called valence shell and electrons in these shell is called valence electron.So they lose electrons to form ions.Metals lose electrons and positively charged ions called cations.

Whereas nonmetals have 5 or 6 or 7 electrons in their outermost shell so they gain electrons to form ions.

For example Aluminium is a metal having electronic configuration (2,8,3). That means aluminium have 3 electrons in its valance shell so it loses its electrons to become a positively charged ion.

Another one is Sodium a metal having electronic configuration (2,8,1). That means aluminium have 1 electrons in its valance shell so it loses its electrons to become a positively charged ion.

Metal atoms are most likely to form ions by losing electrons, which makes them cations. This process helps achieve a more stable electron configuration by having the same number of electrons as the previous noble gas.

Metals atoms are likely to form ions by losing electrons, so the correct answer is 2: loss of electrons. When metals lose electrons, they become cations, which are positively charged ions. This allows them to achieve a more stable electron configuration by having the same number of electrons as the previous noble gas. For example, a calcium atom loses two electrons and becomes a calcium ion with a 2+ charge.

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To convert the units of concentration from mol/g*cm² to mol/kg*m², one should convert grams to kilograms and cm² to m² using known conversion factors. After the conversions, the units will be successfully changed to mol/kg*m².

The question provided is about the conversion of units of concentration from mol/g*cm² to mol/kg*m². This is a common type of problem in chemistry when dealing with different units of concentration. The conversion will involve changing the unit of mass from grams to kilograms, and changing the unit of area from cm² to m².

To convert grams to kilograms, we need to know that 1 kg is equal to 1,000 g. Therefore, we multiply our value in g by (1 kg/1,000 g).

To convert cm² to m², we know that 1 m is equal to 100 cm, and therefore 1 m² is equal to 10,000 cm². So, we multiply our value in cm² by (1 m²/10,000 cm²).

After doing these calculations, we will have successfully converted the given concentration from mol/g*cm² to mol/kg*m².

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