The melting points and boiling points of four elements are shown.
element
melting
point/°C
boiling
point/°C
3
-7
60
х
-101
-34
Y
114
184
z
39
688
slid
In which elements do the particles vibrate about fixed positions at 0°C?
А
Wand X
B
W and Z
с
X and Y
D
Y and Z

The decomposition time : 7.69 min ≈ 7.7 min

Given

rate constant : 0.029/min

a concentration of  0.050 mol L  to a concentration of 0.040 mol L

Required

the decomposition time

Solution

The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time

For first-order reaction :

[A]=[Ao]e^(-kt)

or

ln[A]=-kt+ln(A0)

Input the value :

ln(0.040)=-(0.029)t+ln(0.050)

-3.219 = -0.029t -2.996

-0.223 =-0.029t

t=7.69 minutes

Answer:

fossil fuels

Explanation:

Well I had some topics on this stuff last quarter in science and from what I can remember it should be fossil fuels I think that fossil fuels are technically renewable but they are considered non-renewable since they are either in small supplies, are hard to obtain or take a long time to form.

A, Scientists will use the structure of existing animals as a model :)

Answer:

Scientists will use the structure of existing animal as a model.

Explanation:

-lukelaws

please mark me brainliest I need one more please!!!

ANSWER:

Nonpolar

sorry if I'm wrong

When a solute dissolves in water, a solution is formed.

A solute is any substance capable of dissolving in a solvent in order to form a solution.

When a solute dissolves in a particular solvent, it is said to be that solvent-soluble. Otherwise, it is insoluble.

Now, when the solvent in question is water, the substance is said to be water-soluble or water-insoluble as the case may be.

If a solute is water-soluble, then it forms a solution. If the solute is ionic, it does not just form a solution, it dissociates into its component ions in the solution.

If the solute is not ionic, no dissociation occurs in the solution.

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Answer:

The answer is D

Explanation:

Non metals are:

Hydrogen (H)

Sulphur (S)

Phosphorus (P)

Carbon (C)

Fluorine (F)

Oxygen (O)

Nitrogen (N)

Chlorine (Cl)

Bromine (Br)

Helium (He)

Argon (Ar)

Iodine (I)

Neon (Ne)

Krypton (Kr)

Radon (Rn)

Selenium (Se)

Xenon (Xe)

Answer:

Explanation:

These are the transition metals.  Groups 3-12 also know as the "d" block elements

Answer: ATP hydrolysis

Explanation:

hope this helps<3

Ethanol is formed by the combination of carbon, hydrogen and oxygen as shown in the image attached.

We know that ethanol is an organic compound and the compound is part of the alkanol family of the organic compounds. In this case we are trying to find the equation that shows the enthalpy of the formation of the ethanol.

We know that such equation would have to involve the pure substances that can be combined so as to form the ethanol and the equation for this reaction has been shown in the image attached to this answer.

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There are 12 atoms of Oxygen, since 3 times 4 is 12.

Please mark brainliest!

MgO particles have a mass of 7.4 x 1023 grams.

According to Wikipedia, "a gram molecule can be defined as the amount of a substance equal to its relative molecular mass in grams." One gram of water, for instance, weighs 18 grams (H 2 O = 1 + 1 + 16 = 18 g).

The most common unit used in chemistry to express molarity is the number of moles per liter, represented by the unit sign mol/L or mol/dm3 in SI units. One molar, or 1 M, of a solution's concentration is defined as one mol/L.

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Volume would the helium gas occupy at a pressure of 1.00 atm is 2.08 Liters by using Charle's law.

Helium is a safe, non-flammable gas that is frequently used to fill balloons for festivals and parades. Helium, however, is a crucial component in a variety of industries, including high technology, science, and even national security.

According to Charle's Law: V1 / T1 = V2 / T2, the volume that helium gas would occupy at a pressure of 1.00 atm

V1/T1=V2/T2

12/25=V2/1

V2=2.08 L

Everything is conceivable. Pure helium inhaling causes the body to lose oxygen as if you were holding your breath. If you were unable to breathe at all, your body would run out of blood-stored oxygen within minutes, and you would start to lose consciousness.

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Answer:

0.436 ⇒ 0.44

9.000 ⇒ 9.0

Concept:

Significant figures are where each of the digits of a number are used to express it to the required degree of accuracy, starting from the first nonzero digit.

Therefore, in the context of this question, two significant figure means that two digits of numbers are kept, from left to right, starting from the first nonzero digit.

Solve:

0.436 has 3 significant digits in total starting from left to right

Thus, the last digit should be rounded up / down

Since the last digit is 6, it is greater than 5, so it should be rounded up.

Therefore, a rounded 0.436 is \(\Large\boxed{0.44}\)

9.000 has 4 significant digits in total starting from left to right

Thus, the last two digits should be rounded up / down

Since the last two digits are 0, it is less than 5, so it should be rounded up (or remained).

Therefore, a rounded 9.000 is \(\Large\boxed{9.0}\)

Hope this helps!! :)

Please let me know if you have any questions

In terms of oxidation number, oxidation can be defined as the chemical change in which there occurs an increase in the oxidation number of an atom. Reduction may be defined as a chemical change in which there occurs a decrease in the oxidation number of an atom. The correct option is D.

An oxidizing agent is a substance which suffers a decrease in the oxidation number of one or more of its elements and a reducing agent is a substance which suffers an increase in the oxidation number of one or more of its elements.

In the reaction, oxidation state of 'Ca' increases from 0 to +2, so calcium is oxidized and acts as a reducing agent.

Thus the correct option is D.

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The flow rate of the IV solution in drops per minute is 80 drops/min.

To determine the flow rate in drops per minute, we need to consider the conversion factors and relationships between different units.

First, let's convert the lidocaine dose from grams to milligrams, as the flow rate is given in milligrams per minute:

1 gram = 1000 milligrams

So, 1.0 gram of lidocaine is equal to 1000 milligrams.

Next, we can calculate the total volume of the IV solution in milliliters:

250 mL

To find the flow rate in milligrams per minute, we divide the dose by the total time:

Flow rate = Dose / Time

The dose is 1000 milligrams (1.0 gram) and the time is 1 minute.

Flow rate = 1000 mg / 1 min = 1000 mg/min

Now, to determine the flow rate in drops per minute, we need to convert the IV solution volume from milliliters to drops. Given that 20 drops = 1.0 mL, we can set up a conversion factor:

20 drops / 1 mL

To find the flow rate in drops per minute, we multiply the flow rate in milligrams per minute by the conversion factor:

Flow rate (drops/min) = Flow rate (mg/min) * Conversion factor

Flow rate (drops/min) = 1000 mg/min * (20 drops / 1 mL)

Now we need to convert milliliters to drops:

Flow rate (drops/min) = 1000 mg/min * (20 drops / 250 mL)

Simplifying the expression:

Flow rate (drops/min) = 1000 mg/min * (4/50)

Flow rate (drops/min) = 80 drops/min

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Answer:

C)3 mole CO2 / 1 mole C3H8

Explanation:

Answer:

Explanation:

The reaction that is described goes as follows:

2AgCl + Mg(OH)2 ---> MgCl2 + 2AgOH

The precipitate here is the MgCl2 salt.

I hope it helped!

Answer:

A or B, but I think B would be the safer option.

Explanation:

In an ecosystem, the following chart of cows depicts cause or effect of the text structure.

An 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 by means of nutrient cycles and flow of energy.

Energy enters the ecosystem 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 ecosystem .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.There are different types of ecosystems present.

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Answer:

water

Explanation:

or h2o i mean theyre the same thing soo..

For an electron as a particle, E = \(1/2mv^2\)

For an electron as a particle, the energy E can be described using the equation:

E =  \(1/2mv^2\)

where

This equation represents the kinetic energy of the electron, which is the E is the energy

energy associated with its motion.

This equation assumes classical mechanics and does not take into account relativistic effects that become significant at high speeds close to the speed of light.

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Answer:

Expansion: increase in size Contraction: decrease in size

Explanation:

The increase in size of an object on heating is called expansion where as the decrease in size of an object on cooling is called contraction.

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

3000000000000009000000

The median reaction at the second end point in the HCl and NaOH titration is: HCl + NaOH → NaCl + H2O

In a titration between hydrochloric acid (HCl) and sodium hydroxide (NaOH), the reaction involved is the neutralization reaction between an acid and a base. The balanced equation for this reaction is:

HCl + NaOH → NaCl + H2O

In this reaction, one mole of HCl reacts with one mole of NaOH to form one mole of NaCl (sodium chloride) and one mole of water.

During the titration process, the reaction occurs gradually as the base is added to the acid solution.

The first end point of the titration is reached when the moles of HCl and NaOH are stoichiometrically equivalent, meaning they react in a 1:1 ratio. At this point, all the HCl has been neutralized by the NaOH, and no excess of either reagent remains.

However, if the titration is continued beyond the first end point, the reaction between HCl and NaOH can still occur, albeit in a different ratio.

The second end point refers to the point where the moles of NaOH added exceed the stoichiometrically required amount to neutralize the HCl completely. As a result, any excess NaOH added after the second end point reacts with the excess HCl in a 1:1 ratio.

Therefore, the median reaction at the second end point in the HCl and NaOH titration is:

HCl + NaOH → NaCl + H2O

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If 80.0 g of NaOH is dissolved in 1 kg of water, what is the molality of the solution?

The molality of a solution is calculated like this:

molality = moles of solute / mass of solvent in kg

The solute of our solution is NaOH and the solvent is water. We already know the mass of solvent in kg.

Mass of solvent in kg = 1 kg

To find the molality we still have to find the number of moles of solute. To do that we will have to find the molar mass of NaOH, and then use it to find the number of moles of NaOH that we have in 80.0 g of it.

atomic mass of Na = 22.99 amu

atomic mass of O = 16.00 amu

atomic mass of H = 1.01 amu

molar mass of NaOH = 1 * 22.99 + 1 * 16.00 + 1 * 1.01

molar mass of NaOH = 40.00 g/mol

number of moles of NaOH = 80.0 g/(40-0 g/mol)

number of moles of NaOH = 2.00 moles

Now that we know the number of moles of NaOH and the mass of solvent in kg we can calculate the molality of the solution:

molality = moles of solute / mass of solvent in kg

molality = 2.00 moles/1 kg

molality = 2.00 m

Answer: the molality of the solution is 2.00 m