How many total atoms are in 12 NaBr?​

Answer:

A

Explanation: 11/22

Answer:

A

Explanation:

strong acids dissociate to form H+ (aq) ions

Answer:

Explanation:

3

Significant figures are the number of digits that add to the correctness of a value, frequently a measurement. The following numbers are three significant digits 876000, 1.20 x 10⁵, and 8.77 x 10⁻⁴.

The number of significant single digits (0 to 9 inclusive) in the coefficient of expression in the scientific notation is referred to as "significant figures" (SF). The expression's number of significant figures reveals the engineer's or scientist's level of assurance or precision when expressing a quantity.

When a number is rounded off, its value is maintained but is brought closer to the next number, simplifying the number. The crucial figures are preserved when numbers are rounded off.

The following numbers are rounded off:

1. 876000

2. 1.20 x 10⁵

3. 8.77 x 10⁻⁴

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Answer:

C. would be the correct option.

Explanation:

Burning gasoline is a chemical change because when gasoline is ignited, water and carbon dioxide are produced. Water freezing to form ice would be a physical change since its state of matter has changed, but not the water itself. Sugar dissolving in water is also a physical change because all it's really doing is just forming bubbles and changing the color. Choice D. would also be a physical change since the piece of metal is still a piece of metal, it just expanded when the temperature increased.

Acids are capable of donating the proton ion in the solution. The weak acid is incapable of dissociating completely in the aqueous solution. Thus, option C is correct.

Weak acids are the category of acids that like acids can donate hydrogen or the proton ion to other substances in the solution. Though they differ in the acidic strength which makes them incapable of dissociating their ions fully.

The weak acids cannot completely ionize themselves in water and hence shows less acidic strength than the stronger acids. They have pH between 5-7 and are incapable of dissociating completely. Acetic acid, citric acid, lactic acid, etc, are weak acids.

Therefore, option C. the weak acids do not dissociate completely in water is correct.

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Answer:

True

Explanation:

Limiting reagent is the reactant that determines the progress of the reaction. It determines how much of the product is formed.

The equation for this reaction is;

NaCl (aq) + NH4HCO3 (aq) → NaHCO3 (aq) + NH4Cl (aq)

From the reaction, 1 mol of NaCl reacts with 1 mol of NH4HCO3 to produce 1 mol of NaHCO3

Converting to masses using; Mass = Number of moles * Molar mass

58.44g of NaCl reacts with 79.056g of NH4HCO3

If we were to  sue the whole 1.2 g of NH4HCO3 we would require xg of NaCl

58.44 = 79.056

x = 1.2

x = 0.887g

The fact that 1.2g of NH4HCO3 requires 0.887g of NaCl (which is less than the available 0.75g) means that NaCl is the limiting reagent.

In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

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Answer:

the earth is tilted towards the sun

Explanation:

In the context, there is a sun and earth system and at a certain point when the earth is moving in its orbit around he sun, some point on the earth experiences the summers season. This is because at this point of the earths revolution, the point on the earth is facing the sun and is also tilted towards the sun. So at this point the sun rays fall directly at the surface. While the place which is tilted away from the sun, experiences winter season.

Answer:

Earth's northern hemisphere is tilted toward the Sun.

Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

(i) A mineral is a naturally occurring substance that is solid and inorganic, meaning it does not come from living organisms. (ii) An ore is a mineral deposit that contains enough of a valuable element or mineral to be economically viable for mining and extraction. (iii) Gangue is the unwanted material that is found in an ore deposit.

Minerals have a specific chemical composition and structure that distinguish them from other substances. Ores are usually extracted from the earth's crust and processed to extract the desired minerals or metals. It is typically made up of non-valuable minerals or rocks and is removed during the mining process. Gangue may also contain harmful elements such as heavy metals or radioactive substances.

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Answer:

Explanation:

Enzyme activity is affected by the increase in temperature.

enzyme activity is also affected by the change in ph.

enzyme activity is also affected when substrate concentration is not increased in a chemical reaction.

Based on your observations, enzyme activity is affected by the increase in temperature.Enzyme activity is also affected by the change in pH.

Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.

It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.

It is important to note down observations so that the testing of hypothesis is made easier.There are four types of observations .Observations need to be descriptive and must be written in complete sentences and should include all the numerical data of the experiment.

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As an example option C. A lizard is cold, and it moves to a sunny rock to warm up,  hows an organism that cannot reach homeostasis through internal changes.

Homeostasis is the nation of steady internal, bodily, and chemical conditions maintained via dwelling systems. that is the circumstance of gold standard functioning for the organism and consists of many variables, which include body temperature and fluid balance, being kept inside certain pre-set limits.

Homeostasis is the ability to keep a quite stable internal kingdom that persists regardless of modifications within the world outside. All dwelling organisms, from flora to puppies to human beings, must alter their internal environment to procedure power and ultimately continue to exist.

Homeostasis is maintained by using a series of manipulation mechanisms performed at the organ, tissue, or cell degree. these management mechanisms include substrate supply, activation or inhibition of person enzymes and receptors, synthesis and degradation of enzymes, and compartmentalization.

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Approximately 0.023% of the original thorium sample still exists today. A 25.2 g sample of thorium was discovered in Norway in 1882.

Given,

A 25.2 g sample of thorium was discovered in Norway in 1882, and the most sustainable isotopes of thorium has a half-life of 14.05 billion years.

Let's assume that at the start of the universe, there were x grams of thorium, and half-life is 14.05 billion years.

So, after the first half-life, there will be x/2 grams left, and

after the second half-life, there will be x/4 grams left and so on.

This process can be expressed using the formula

N = N0 (1/2)^(t/h) ,where Nis the current amount of thorium,

N0 is the original amount of thorium,

t is the time that has passed, and h is the half-life of thorium

The amount of thorium is the current amount of thorium, .

N0 is the original remaining today after 14.05 billion years can be calculated as follows:

N = N0 (1/2)^(t/h)N = 25.2 g (1/2)^(14.05 billion years/14.05 billion years)

N ≈ 0.00576 g

Therefore, approximately 0.023% of the original thorium sample still exists today.

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Answer:

Liquids take on the shape of their container. The liquid state of matter is an intermediate phase between solid and gas. Like the particles of a solid, particles in a liquid are subject to intermolecular attraction; however, liquid particles have more space between them, so they are not fixed in position.

Explanation:

Answer:

4. Heart refers to a quantity

Answer:

Heat Refers To A Process

Answer:

The mass number of an isotope is the total number of protons and neutrons in an atomic nucleus. If you know that a nucleus has 6 protons and 6 neutrons, then its mass number is 12. If the nucleus has 6 protons and 7 neutrons, then its mass number is 13.

Explanation:

They tell us that the pressure of the gas is constant and the temperature and volume vary. If we assume that the gas behaves like an ideal gas, we can apply Charles's law, which tells us:

where,

V1 is the initial volume, 3.62L

T1 is the initial temperature, 21.6°C=294.75K

V2 is the final volume, 3.45L

T2 is the final temperature, in Kelvin

Now, we clear T2 and replace the known data:

The temperature at which the volume of the gas is 3.45 L will be 281K

Answer. b) 281K

Answer:

A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Double displacement reactions typically result in the formation of a product that is a precipitate

Explanation:

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Answer:

9302 moles of CO contain 5.60×10²⁷ molecules

Explanation:

We solve this with Avogadro's number.

NA = 6.02×10²³

This number states the how many particles are in 1 mol of anything.

1 mol of atoms contains 6.02×10²³ atoms

1 mol of molecules  contains 6.02×10²³ molecules.

We apply a rule of three:

6.02×10²³ molecules are contained in 1 mol of CO

Then, 5.60×10²⁷ molecules may be contained in (5.60×10²⁷ . 1) / 6.02×10²³

= 9302 moles

The fizzing that occurs when sodium hydrogen carbonate (NaHCO3) is added to sulfuric acid (H2SO4) is due to a chemical reaction that produces carbon dioxide gas (CO2), water (H2O), and sodium sulfate (Na2SO4). The balanced chemical equation for this reaction is:

NaHCO3 + H2SO4 → Na2SO4 + CO2 + H2O

The fizzing occurs as the carbon dioxide gas is produced and released from the mixture.

The fizzing is fastest immediately after the NaHCO3 is added because at that moment, the surface area of the NaHCO3 particles is at its highest. This increased surface area provides more sites for the acid to react with, resulting in a greater number of reactions occurring simultaneously and a faster production of CO2 gas. As the reaction progresses, the surface area of the remaining NaHCO3 particles decreases, slowing down the rate of reaction and the production of CO2 gas.

In chemical reactions, reactants are substances which form products in a reaction and the number of molecules are balanced on both sides at the end of the reaction.

Reactants are the molecules or substances, that are present at the start of the chemical reaction.

They are usually written on the left-hand side of the equation.

Products are substances that are present at the end of the chemical reaction.

They are generally written on the right-hand side of the equation.

A generic chemical reaction can be written:

In this reaction, A and B are the reactants and C is the product .

In a balanced equation, the number of elements on the product side of the reaction is equal to the number of elements on the reactant side.

Therefore, reactants are substances which form products in a reaction and the number of molecules are balanced on both sides at the end of the reaction.

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Answer:

Element 3

Explanation:

Properties of metals are:

- Being shiny

- Are good conductors of electricity

- Are good conductors of heat

- Have a high melting point

Element 3 has all of these properties, so it is most likely a metal.

Hope this helps!

Answer: 1 and 3

Explanation:

To make a 5.00 M solution using 210.0 grams, g, of sodium chloride, NaCl, we will use the formula of volume of solution in liters is equal to mole of solute per molarity of solution, which is 0.718 L.

Molarity (M) refers to the amount of a substance in a specific volume of solution. It is defined as the moles of a solute per liters of a solution. Molarity is also known as the molar concentration of a solution.

Molarity  is given by the quotient,

Molarity = moles of solute/volume of solution in liters.

Now in order to get the molarity of the solution, we have to divide the moles of solute over the liters of solution. Since we are given the mass of the solute, we must first convert the mass of NaCl into moles with the help of the molar mass of NaCl as a conversion factor.

210 NaCl x ( 1 mol NaCl/ 58.44g NaCl) = 3.59 mol NaCl.

We already have the molarity of the solution that is 5.00 M. So the solution to find out the volume will be,

Volume of solution in liters = mole of solute/ molarity of solution,

That is 3.59 mol NaCl / 5M = 0.718 L

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The empirical formula of a compound that contains 60% titanium and 40% oxygen by mass is TiO₂.

Empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.

The empirical formula of a substance can be calculated as follows:

Next, we divide each mole value by the smallest as follows:

The empirical ratio of Titanium and oxygen is 1:2, hence, the empirical formula is TiO₂.

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Answer:

Explanation:

As relative molecular mass of molecule increases its rate of diffusion decreases . Mr of HCl is 1+35.5=36.5 which is greater than Mr of NH3 which is only 14+3=17. As HCl is heavier it'll diffuse at a lower rate so travel less distance whilst NH3 will cross a greater distance as it diffuses faster so white solid appears closer to HCl that is approximately B.

Among the given options, hydrogen bonds between regions of the polypeptide chain are the most critical for maintaining the native tertiary structure of a globular protein. They provide specific and directional interactions, contributing significantly to the stability of the folded protein.

The most critical factor for maintaining the native tertiary structure of a globular protein is the hydrogen bonds between regions of the polypeptide chain in the folded protein. Here's why:

1. Hydrogen bonds are formed between the electronegative atoms, typically oxygen or nitrogen, and hydrogen atoms in the protein. They contribute to the stabilization of the folded structure by providing specific and directional interactions between different regions of the polypeptide chain.

2. The hydrophobic effect, which involves the burying of non-polar residues in the protein interior, is important for stabilizing the protein's overall structure, but it does not directly contribute to maintaining the native tertiary structure.

3. Disulfide bonds between cysteine (Cys) residues can form covalent bonds and play a critical role in stabilizing the tertiary structure of some proteins, especially those found in extracellular environments. However, not all proteins have disulfide bonds, and the absence of disulfide bonds does not necessarily lead to loss of the native tertiary structure.

4. Salt bridges, also known as ionic bonds, occur between oppositely charged side chains and contribute to the stabilization of protein structure. While they can play a role in maintaining the structure, they are generally less critical compared to hydrogen bonds.

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Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles , Option D is the correct answer.

What is an insulator ?

Insulators are those substances that do not conduct heat or electricity like their conductor counterparts.

Conduction of electric charges is as a result of the free flow of electrons in the atom of the substance.

Hence, a good insulator holds on tightly to its electrons and prevent them from flowing freely to conduct electric charges.

Therefore, Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles.

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B. Atoms in glass hold tightly to their negatively charged particles

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The enthalpy change when 1 mole of gaseous atoms is formed from elements in its standard state is called the enthalpy change of atomization.

It is defined as the enthalpy change that occurs when one mole of a substance in its standard state is converted into gaseous atoms at the same temperature and pressure. This process requires the input of energy, which is typically provided by heat. The enthalpy change of atomization is usually expressed in units of kilojoules per mole (kJ/mol).

For example, the enthalpy change of atomization for chlorine gas is +121 kJ/mol. This means that it takes 121 kilojoules of energy to convert one mole of chlorine gas into gaseous chlorine atoms at standard temperature and pressure.

This process involves breaking the bonds between the atoms in the elements and forming new bonds between the individual atoms to create the gaseous atoms. The enthalpy change associated with this process is a measure of the energy required to break the bonds and the energy released when the new bonds are formed.

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Place the atomic number subscript and mass number superscript to the left of the atomic symbol.

The chemical properties of an atom are determined by its atomic number and are represented by the symbol Z. The total number of nucleons in an atom is the atomic mass number. This value is represented by the symbol A.

Isotopes are members of a family of elements that have the same number of protons and a different number of neutrons. The number of protons in the nucleus determines the atomic number of an element on the periodic table. Isotopes are atoms of the same element that contain the same number of protons but different numbers of neutrons.

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