Cube has a mass of 15g and the volume is 30cm what’s its density

Answer: True

Explanation:

Venus is the hottest planet in the solar system. Mercury is still hot but half of it is also cold due to the sun not directly pointing at it.

Answer:

true

Explanation:

Answer:

C

Explanation:

The answer is in the image.

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Walk in faith and trust in God!

Answer:

combining wax

Explanation:

Candles burn through an efficient combustion process by combining wax, a poor conductor of heat that melts just above room temperature, with a wick, an absorbent material that will absorb liquid wax and transfer it toward the candles flame while its burning. when a candles wick is lit, the heat from above it. and I'm not a good explainer sorry if I got it wrong

Answer:

yes it is a chemical change

i have made it in above picture

The ratio of the rate constant for the catalyzed reaction to that for the uncatalyzed reaction can be determined based on the activation energies of the reactions.

The ratio of the rate constant for the catalyzed reaction (k_cat) to that for the uncatalyzed reaction (k_uncat) can be calculated using the Arrhenius equation:

\(\[ \frac{k_{cat}}{k_{uncat}} = \frac{e^{-\frac{E_{a,cat}}{RT}}}{e^{-\frac{E_{a,uncat}}{RT}}} \]\)

Where Ea,cat is the activation energy for the catalyzed reaction, Ea,uncat is the activation energy for the uncatalyzed reaction, R is the gas constant, and T is the temperature in Kelvin.

Assuming that the frequency factor (A) is the same for both reactions, it cancels out when calculating the ratio. Therefore, the ratio of the rate constants is solely dependent on the activation energies.

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Answer:

i think iodine

Explanation:

The option that is NOT a reason to record accurate procedures and results during an experiment is: "Its not that important to record accurate procedures or data."

It is critical to record correct procedures and results so that others may reproduce the experiment and the researcher can repeat it in the future. Proper documentation also aids in the identification of any flaws or inconsistencies that may have happened during the experiment and may be resolved in future studies. Accurate protocol documentation enables other researchers to reproduce the experiment and confirm the findings. Replication is an important part of scientific study since it helps to establish the results' validity and dependability. If the techniques are not adequately documented, subsequent researchers may be unable to replicate the experiment, resulting in differences and doubt regarding the results.

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Answer:

the reactants are na and cl2 the products is the combination nacl --the law of conservation of matter keeps reactions balanced. No you would not be adding more atoms that is what the first combo is.  The coefficient 2 stands for 2 atoms of KL

Explanation:

Point on the number line represents the product point D

Number line is the pictorial representation of number on straight line called number line

Here given data is a number line in which 10 numbers are seen and this numbers are toward right side it represent positive numbers and toward left side it represent negative numbers so here the point d represent the product and point a represent the reactant so that's why point d which represent 10 are product

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A testable  scientific question could be asked about the salt formation is; "Is the salt soluble in water?

A scientific question is a question that can be answered by experiments. In other words, a scientific question must be empirical. Its answer can only be obtained by carrying out experiments.

In the case of bonding in alkaline earth metals, the kind of bond formed is ionic. Ionic compounds are soluble in water. Hence, a testable  scientific question could be asked about the salt formation is; "Is the salt soluble in water?

This can be answered by dissolving several salts of alkali earth metals in water.

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Answer:

5e-6

Explanation:

Answer:

0.005

Explanation:

The formula for this equation is dividing the length value by 1000 which will give you your answer which in the case I gave you the answer to your question your welcome. : )

Answer:

1. The chemical formula is determined by first finding the positive charge, which is cation, and then finding the negative charge, which is the anion. The cation is writing first, than the anion.

2.An ionic compound is named first by its cation and then by its anion.

Explanation:

Just did it.

Answer: 1 mole carbon dioxide contains 6.02 x 1023 molecules.

Hope this helps!

Answer:

46860.8 joules of heat

Explanation:

Use the formula ΔQ = mcΔT

ΔQ = gain or loss of heat (in joules)

M = mass (in grams),

C = specific heat (in J/g°C)

ΔT = change in temperature (in °C)

Substitute the known values into the formula:

ΔQ = (320.0 g)(4.184 J/g°C)(35.0˚C)

ΔQ = 46860.8 J

Answer:

There is 0.75moles in the solution

Answer:

Explanation:

concentration=no.of moles/volume in dm3

which is

1.5mol/dm3 multiply by 500/1000

=0.75moles

Answer:

"The number of air molecules above a surface determines air pressure. As the number of molecules increases, they exert more pressure on a surface, and the total atmospheric pressure increases. By contrast, if the number of molecules decreases, so too does the air pressure."

Answer:

160 that is an easy answer

Explanation:

Answer: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element?

Explanation: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element? 74.92 amu. Use your periodic table to determine which element this is. As. An element exists

The average atomic mass of the element is 74.93 amu

Let the 1st isotope be A

Let the 2nd isotope be B

Let the 3rd isotope be C

From the question given above, the following data were obtained:

Abundance of A (A%) = 24.1%

Mass of A = 75.23 amu

Abundance of B (B%) = 48.7%

Mass of B = 74.61 amu

Abundance of C (C%) = 27.2%

Mass of C = 75.23 amu

The average atomic mass of the element can be obtained as follow:

= [(75.23 × 24.1)/100] + [(74.61 × 48.7)/100] + [(75.23 × 27.2)/100]

= 18.13043 + 36.33507 + 20.46256

Thus, the average atomic mass of the element is 74.93 amu

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The compound that is covalent is the compound A.

We know that the forces that holds the molecules of an ionic substance together is so strong that the ionic substances are known to have a high melting and a high boiling point. Thus, it is already clear that the compounds B and C are both ionic because they are highly conducting and they also have a high melting and boiling point.

The compound A has a low melting and boiling point and also does not conduct electricity. This goes to tell us that A is a covalent compound.

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Answer:

compound A

Explanation:

edge 2023

The molar mass of the unknown acid is 150 g/mol.

Mass of acid (m) = 0.135 g

Volume of NaOH = 21.36 mL = 0.02136 L

Concentration of NaOH (c) = 0.1003 M

The balanced equation is:Acid + NaOH → NaSalt + Water

Molar mass of the unknown acid can be calculated by using the formula;molar mass of acid = (mass of acid used × molar mass of NaOH × volume of NaOH used) / (number of hydrogen ions × 1000)

Mass of NaOH = Concentration × volume = 0.1003 × 0.02136 = 0.002145 mol

Mass of acid used = 0.135 g

Molar mass of NaOH = 40 g/mol

Number of hydrogen ion = 1

Volume of NaOH used = 21.36 mL = 21.36/1000 = 0.02136 L

Molar mass of acid = (0.135 × 40 × 0.002145) / (1 × 0.02136)

Molar mass of acid = 149.97 g/mol ≈ 150 g/mol

Therefore, the molar mass of the unknown acid is 150 g/mol.

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According to the equation for the reaction, if the number of moles of reactants is halved, the number of moles of H₂O (l) produced in the reaction is halved as well.

A titration is a procedure in volumetric analysis in which a given volume of a solution of a known concentration is added to a given volume of a solution of an unknown concentration to determine the unknown concentration.

The moles of the substances that reacted as given in the equation of the reaction are used to determine the unknown concentration.

The equation of the given reaction is given below:

HCl + NaOH ---> NaCl + H₂O

1 mole of HCl reacts with 1 mole of NaOH to form 1 mole of water.

Hence, halving the moles of reactants would halve the mole of water formed.

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1.325 g of solid LiCl is needed to make 250 ml of a 0.125 m solution.

We can use the following formula to determine how many grams of LiCl are needed to create a 0.125 m solution:

Molarity (M) is calculated as moles of solute per liter of solution.

Molarity (M) x liters of solution equals moles of solute.

Inputting the values provided yields:

LiCl moles are equal to 0.125 mol/L times 0.250 L, or 0.03125 mol.

We must utilize the molar mass of LiCl, which is 42.39 g/mol, to convert moles of LiCl to grams. LiCl is therefore needed in the following mass:

LiCl's mass is calculated by multiplying its molar mass (42.39 g/mol) by its molecular weight (0.03125 mol). The result is 1.325 g of LiCl.

Hence, to make 250 mL of a 0.125 m solution we require 1.325 g of solid LiCl.

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The numerical value of the Ksp  of \(BaSO_{4}\) is 1.69 * 10^-20.

The Ksp is an equilibrium constant that shows the extent to which a substance is soluble in water. Now consider the fact that \(BaSO_{4}\) is almost insoluble in water.

i) The Ksp of the \(BaSO_{4}\) solution can be obtained from the relation;

Ksp = [\(Ba^{2+}\)] [\(SO_{4}^{2-}\)]

ii) The numerical value of the Ksp is obtained from; [1.30 × 10–10]^2 = 1.69 * 10^-20

iii) The reason for the toxicity of \(BaCO_{3}\) even though it is not more soluble that barium sulfate is that \(BaCO_{3}\) can dissolve in the gastrointestinal tract which is acidic leading to barium poisoning.

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Answer:

Hey!

Your answer is definitely A!

Explanation:

Hope this helps!

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In an ecosystem,  the following is a consequence of urban heat islands which is  increased precipitation downwind of the city.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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somethingExplanation:

Answer: the answer for this question is in the pic

Explanation:

Answer:

See below

Explanation:

The glycosidic bond forms between the carbon atom on the glucose molecule and the nitrogen atom present on the nitrogenous base. A diagram has been attached to show this particular bond. There is also a phosphate molecule bonded on the sugar molecule at the other end.

387.6 number of atoms of oxygen are in 32.3 moles of Al₂(SO₄)₃.

What do you mean by the mole concept ?

Mole is the amount of substance in a chemical system that contains as many elementary entities as there are atoms in exactly 12 grams of the carbon−12 isotope.

The mole concept is a convenient method of expressing the amount of a substance.

To calculate the the number of atoms of O in 32.3 moles of Al₂(SO₄)₃-:

The chemical formula for aluminum carbonate, Al₂(SO₄)₃ , indicates that in one mole of the compound there are twelve moles of oxygen atoms.

Now,

=22.3 m o l Al₂(SO₄)₃× 12  m o l O atoms/1 m o l Al₂(SO₄)₃

= 387.6 m o l of O atoms

Hence, 387.6 number of atoms of oxygen are in 32.3 moles of Al₂(SO₄)₃.

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