Which methods could be used to dilute a solution of sodium chloride (NaCl)?

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:

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:

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:

ZnCO3 + 2HClO4 = Zn(ClO4)2 + CO2 + H2O

Explanation:

ZnCO3 + 2HClO4 = Zn(ClO4)2 + H2CO3

ZnCO3 + 2HClO4 = Zn(ClO4)2 + CO2 + H2O

Final answer:

Zinc metal reacts with hydrochloric acid to produce zinc chloride and hydrogen gas, represented by the balanced equation Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g).

Explanation:

The reaction between zinc metal and hydrochloric acid (HCl) is a single-displacement reaction that produces zinc chloride (ZnCl2) and hydrogen gas (H2). The balanced chemical equation for this reaction is:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

This reaction is an example of the combination of stoichiometry and the ideal gas laws that can occur in chemical reactions.

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:

876.672 g

Explanation:

Data given:

moles of antimony (Sb) =7.20  mol

Molar mass of Sb= 121.76 g

Mass in grams of Sb

Formula to be used

                      no. of moles = mass in grams / molar mass

For antimony (Sb) we can write as

        no. of moles of Sb = mass in grams of Sb / molar mass of Sb

Rearrange above equation

    mass in grams of Sb = no. of moles of Sb x molar mass of Sb . . . . . . .(1)

Put values in above formula (1)

 mass in grams of Sb = 7.20 mol x 121.76 g/mol

mass in grams of Sb = 876.672 g

Final answer:

The mass of 7.20 mol of antimony, given its molar mass of 121.76 g/mol, is calculated to be 876.672 grams by multiplying the number of moles by the molar mass.

Explanation:

To determine the mass in grams of 7.20 mol of antimony, with a molar mass of 121.76 g/mol, you use the formula mass = moles × molar mass. Therefore, the calculation should be as follows:

Mass of antimony = 7.20 mol × 121.76 g/mol = 876.672 g

This calculation shows that 7.20 moles of antimony has a mass of 876.672 grams. To solve such problems, always ensure to multiply the number of moles given by the substance's molar mass, which in this case is derived from the periodic table for antimony (Sb).

87.75 g of fructose

Explanation:

molar concentration = number of moles / volume (L)

number of moles = molar concentration × volume

number of moles of fructose = 1.5 × 0.325

number of moles of fructose = 0.4875 moles

number of moles = mass / molar weight

mass =  number of moles × molar weight

mass of fructose = 0.4875 × 180

mass of fructose = 87.75 g

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molar concentration

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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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The answer is argon !

Explanation:

The answer is argon !

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.

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:

4.08

Explanation:

Answer:

4.08

Explanation:

a . p .  e . x .

Answer:

Bombardment by asteroids

Explanation:

All of the other ones explain themselves

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:

c

Explanation:

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

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.

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:

P = 8000 Kg m/s

When speed is increased to 50 m/s,

P = 40,000 kg. m/s

Explanation:

Given data:

Mass = 800 Kg

Velocity = 10 m/s

Momentum = ?

Speed increased = 50 m/s

Momentum = ?

Solution:

Formula:

P = mv

P = 800 kg× 10 m/s

P = 8000 Kg m/s

When speed is increased to 50 m/s.

P = mv

P = 800 kg× 50 m/s

P = 40,000 kg. m/s

Answer:

twins

Explanation:

twins are genetically identical

Answer: biotic factors or biotic factors

Explanation:

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

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.

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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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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Answer:

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

Explanation:

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:

[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.

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.