During which two minute time period is the temperature of the water changing fastest? Select one: a. 0-2 minutes b. 2-4 minutes c. 4-6 minutes d. 6-8 minutes Clear my choice

Answer:

3

Explanation:

6.07 has 3 digits and all are significant

Answer:

The correct option is B

Explanation:

just did it edg 2020.

Answer:

the answer is c

Explanation:

Answer:

F

EXPLANATION

Among the given elements fluorine(F)can not lose electrons easily because of its high electron affinity, high nuclear charge and high electronegativity.

Answer:

F

Explanation:

it won't lose electron , rather it would gain electron to complete its octate......

Electronic Configuration of F = 2,7

So F will gain 1 electron ....

Answer:

pH and pOH denote the negative log of the concentration of hydrogen or hydroxide ions. High pH means that a solution is basic while high pOH means that a solution is acidic. ... So here the basic definition of pH is that it's equal to negative log base 10 of the concentration of protons in your solution.

pH and pOH are inversely proportional to one another i.e. as one increases, the other decreases and vice versa.

pH and pOH are terms used to measure the level of acidity or alkalinity of a substance.

A basic solution has a pOH less than 7, while an acidic solution has a pOH greater than 7.

On the other hand, a basic solution has a pH greater than 7 while an acidic solution has a pH lesser than 7.

Therefore, it can be said that pH and pOH are related inversely i.e. as one decreases, the other increases.

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Answer:

860 J / mol

Explanation:

Enthalpy = Energy / no. of moles

no. of moles = mass / molar mass

Take the atomic mass of H = 1.0,

molar mass of H2 = 1.0 x 2

= 2.0

no. of moles of H2 = 9.00/2

= 4.5 mol

Hence,

Enthalpy = 3870 / 4.5

=860 J / mol

Answer:

It can be improved by:

a) Adding METHANOL

b) Adding BUTANOL

c) Adding ETHANOL.

Explanation:

hope it helps.

Answer:

(b) BeF2 > OF2 > CH3OH

Explanation:

The degree and type of intermolecular forces present in a substance influences its vapour pressure considerably. The greater the magnitude and strength of intermolecular forces in the substance, the lower the vapour pressure of the substance.

BeF2 molecules are held together by weak vanderwaals forces hence BeF2 will exhibit the least degree of intermolecular interaction and have the highest vapour pressure. OF2 molecules are bound together by dipole interactions hence it will exhibit a lower vapour pressure compared to BeF2. CH3OH molecules form hydrogen bonds with water molecules hence it will exhibit the least vapour pressure among the trio.

Answer: The rate constant is the reaction rate divided by the concentration terms.

Answer:

2.22 x  10²³

Explanation:

first we have to find number of moles

mol = 10/27

mol= 0.37 mol

Now,

number of atoms = mole x 6 x 10²³

                             = 0.37 x 6 x 10²³

                            = 2.22 x  10²³

Answer:

The formula mass of Na2S04 is 142.04 g/mol

Answer:

142.04 g/mol

Explanation:

the formula Na2SO4 means:two moles sodium (45.98g), one mile sulfur (32.06g), and four moles oxygen (64.00g) combine to form one mole of sodium surface (142.04g).

Answer:

325 g/L,

0.9503 M

Explanation:

65 g sugar --- 0.2 L

x g              ---  1 L

x = 65/0.2 g/L = 325 g/L

Sugar(sucrose) is C12H22O11.

Molar mass (C12H22O11) = 12*12 + 1*22 + 16*11 = 342 g/mol

325 g/L * 1 mol/342 g = 0.9503 mol/L = 0.9503 M

Answer 0.6398(M) is not related to sugar (sucrose),

it should be given formula or molar mass of sugar if it is different than sucrose.

Answer:

Supercontinent is a single landmass formed by the combination of many Earth's continental blocks or cratons.

Supercontinents form and split up every 400 or 500 million years and the last supercontinent was formed 300 million years ago, so it is possible that any of the modern continents will combine together to form a new supercontinent in future.

Answer:

Yes, modern continents could recombine to form a new supercontinent. Because the continents move at different rates and in different directions, it’s likely that in the future, continents will collide and join together.

Explanation: Edmentum's EXACT ANSWER SO DO NOT COPY!  Rewrite it in your own words.

Answer:

The enthalpy of reaction is -185 kJ

Explanation:

To get the reaction:

 H₂(g) + Cl₂(g) → 2 HCl(g)

you must follow the following steps:

1)  Reactive molecules must break their bonds to obtain their atoms.

H₂(g) → 2 H(g)

Cl₂(g) → 2 Cl(g)

Bond energy (or enthalpy) is the energy required to break one mole of bonds of a gaseous substance. In the case of diatomic molecules with a single bond, it corresponds to the energy necessary to dissociate 1 mole of said substance in the atoms that form it.

Whenever you want to break links you must supply energy, so the link enthalpy will have positive values; while when a mole of bonds is formed energy is released and the bond enthalpy of this process will be negative.

In this case you will then have:

H₂(g) → 2 H(g)           ΔH=436 kJ/mol

Cl₂(g) → 2 Cl(g)         ΔH=243 kJ/mol

So the total energy needed to break all the bonds is:

ΔH=1 mol*436 kJ/mol +1 mol* 243 kJ/mol= 679 kJ

2) The atoms that were obtained in the break of the bonds must be combined to obtain the product.

2 H (g) + 2 Cl (g) → 2 HCl (g)

Being the single bond energy for one mole of 431 kJ H-Cl bonds and considering that two moles of H-Cl bonds are formed, the ΔH is:

ΔH = -2 moles* (432 kJ/mol) = -864 kJ

As mentioned, when a mole of bonds is formed energy is released, the bond enthalpy of this process will be negative.  So the formation of HCl is negative.

Hess's law states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reactions comprising it. So:

ΔHtotal= -864 kJ + 679 kJ

ΔHtotal= -185 kJ

The enthalpy of reaction is -185 kJ

Explanation:

(a):their malleability:

>iron making. iron worker heat the meat and hammer it to give them the desired shape.

> in the jewelry making process, like the gold or silver you wear are results due to the malleability of metal

(b):their ductility:

>for the making of high tension cable that connects different cities for transferring of electricity.

>for making wire gauze

(c):their ability to conduct electricity:

>for lighting up your house with light bulbs

>for using cooking stoves

>to make refrigerator work.

Answer:

a)gold and silver-used to make jewellery

b)gold and copper(we draw them in wires easily because they are not brittle)

c)copper and iron(this is because both of them are metal and metaps are best conductors of electricity)

Explanation:

uses of copper- to make utensils

to make wires for circuits

uses of silver-to make jewellery

to make mirrors

malleability is the property of a meta in which the metal can be changed into different shapes.

Ductility-can be drawn into thin wires.

Answer:

Matter is composed of exceedingly small particles called atoms. An atom is the

smallest unit of an element that can participate in a chemical reaction.

Answer:

Chemical reaction.

Explanation:

Add minisatellites. Hence, option C is correct.

Electrophoresis is a laboratory technique used to separate DNA, RNA or protein molecules based on their size and electrical charge.

You are a forensic scientist working on a murder case. You have taken the blood sample from the crime scene and put it through Electrophoresis and Southern blotting. you need to add minisatellites.

Hence, option C is correct.

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Answer:

E. None of the above

Explanation:

Answer:

Molecule

Explanation:

Compounds are chemical substances comprising of two or more elements. The smallest particle contained in a compound is the MOLECULE. Molecules are combinations of atoms (same or different) of an element held together by a chemical bond.

Since a compound is a molecule with two or more elements combined, the chemistry of the molecules contained in a compound determines its chemical properties. This means that the molecules of a compound are responsible for the interactions of a compound in a chemical reaction. Examples of molecules are H2O, N2, O3 etc.

Answer:

We don't know what solvent X and solvent Y are, but from the chart, we can see that in solvent X, hydrochloric acid can conduct electricity (bulb lights up), and react with calcium carbonate.

So, we can say the electrical conductivity when HCl is dissolved in solvent X is high, and when HCl is dissolved in solvent Y, the electrical conductivity is low (because light bulb doesn't light up).

Additionally, in solvent X, HCl ionizes, this shows the property of acids: reacts with carbonates to give CO2 (because CO2 reacts with lime water to make it cloudy).

In solvent Y, HCl does not ionize, so there is no reaction between acid and calcium carbonate.

Answer:

Niels Bohr, refined the model of an atom by proposing a quantized shell structure atomic model in order to describe how the electrons are able to maintain stable orbits around the nucleus

Based on the predictions of classical mechanics the electron motion of the Rutherford model was unstable as the electrons where expected to have lost some energy during motion and thus having to come rest in the nucleus

According to the modification by Neils Bohr in 1913, electrons move in  shells or orbits of fixed energy and emission of electromagnetic radiation takes place only when electrons changes the orbit in which they move

Explanation:

Answer:

Initial volume of the container (V1) = 1.27 L (Approx)

Explanation:

Given:

Number of mol (n1) = 5.67 x 10⁻²

Number of mol (n2) = (5.67 +2.95) x 10⁻² = 8.62 x 10⁻²

New volume (V2) = 1.93 L

Find:

Initial volume of the container (V1)

Computation:

Using Avogadro's law

V1 / n1 = V2 / n2

V1 / 5.67 x 10⁻² = 1.93 / 8.62 x 10⁻²

V1 = 10.9431 / 8.62

Initial volume of the container (V1) = 1.2695

Initial volume of the container (V1) = 1.27 L (Approx)

Answer: 1.27 L

Explanation:

First, calculate the final number of moles of propane (n2) in the container.

n2 = n1 + nadded = 5.67 × 10^−2 mol + 2.95 × 10^−2 mol = 8.62 × 10^−2 mol

Rearrange Avogadro's law to solve for V1.

V1 = V2 × n1 / n2

Substitute the known values of n1, n2, and V2,

V1 = 1.93 L × 5.67 × 10^−2 mol / 8.62 × 10^−2 mol = 1.27 L

Answer:

[tex]\boxed{\mathrm{view \: explanation}}[/tex]

Explanation:

This is an irreversible reaction, we cannot derive any [tex]\mathrm{K_c}[/tex] expression for it. The [tex]\mathrm{K_c}[/tex] expression can only be derived for reversible reactions and not irreversible reactions. We cannot derive the [tex]\mathrm{K_c}[/tex] expression for this reaction.

Answer:

–1

Explanation:

The electronic configuration of the neutral atom is given below:

2 8 7

From the electronic configuration of the neutral atom, we can see that the atom has 7 electrons in it's outermost shell. This implies that the element needs 1 more electron to complete it's octet configuration.

Therefore the charge on the ion of the element will be –1 indicating that the atom has received 1 electron to complete it's octet configuration.

At 17 celsius ❤️

it will start to boil ❤️

#indian❤️

Answer:

Vaporization is basically just evaporation which does not require nearly as much heat and happens naturally however when it comes to boiling point this is the point where water has been heated enough to start bubbling and changing state slowly.

Explanation:

Answer:

10.2 L of CO₂

Explanation:

Our reaction is:

2C + O₂  →  2CO₂

We convert the mass of C, to moles:

5.50 g / 12g/mol = 0.458 moles

Ratio is 2:2, so if 2 moles of C can produce 2 moles of CO₂ then 0.458 moles of C would produce 0.458 moles of gas.

By the Ideal Gases Law, we know that 1 mol of gas is contained in 22.4L, so:

0.458 mol . 22.4L / 1mol = 10.2 L

Answer:

Ksp = [Mg₂⁺][F⁻]²

Explanation:

Ksp is the equilibrium constant for a solid dissolving in an aqueous solution. The equilibrium constant for a reaction is always products over reactants.

MgF₂ (s) ⇒ Mg₂⁺(aq) + 2F⁻(aq)

The equilibrium constant would be K = [Mg₂⁺][F⁻]². Since MgF₂ is solid, it is not included in the equilibrium expression.

Therefore, Ksp would be the same as the equilibrium constant.

Ksp = [Mg₂⁺][F⁻]²

Hope this helps.

Answer:

Ksp = [Mg2+]3 × [PO43-]2

Explanation:

edge 2021

Answer:

11 Protons

Explanation:

Na-23 shows the mass of the element as 23. Therefore subtract 12 neutrons from the mass to get # of protons which is = to atomic #.

The atomic number of 23-Na is 11. It can be calculated from the number of protons present in the nucleus of an atom.

The atomic number is a fundamental property of an element and represents the number of protons found in the nucleus of an atom. It uniquely identifies each element on the periodic table. In a neutral atom, the atomic number also indicates the number of electrons present in the atom, as the number of protons and electrons in an atom are equal.

For example, hydrogen has an atomic number of 1, indicating that it has one proton in its nucleus. Oxygen has an atomic number of 8, indicating that it has eight protons in its nucleus.

The atomic number determines the element's position in the periodic table and provides important information about its properties and behavior.

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Answer:

12

Explanation:

To get to this answer you have to look at the number first. So the given number is 12.47 and you need 2 sig figs.

To help you understand this more start off by underlining the first 2 numbers because 2 sig figs are needed.  12.47

Now you want to look at the number after the underlined (I bolded that number). 12.47

If the number is above 5 then you would round the previous number up by one but in this case it is 4 so you do not increase the number. Hence, you getting 12 as your final answer.

Hope this helped! Let me know if you have any questions.

Answer:

D- Assertion is false and Reason is true

Explanation:

Precipitation is said to have occurred when an insoluble product is formed from soluble ones. Let us take an instance;

BaCl2(aq) + H2SO4(aq) -------> BaSO4(s) + 2HCl(aq)

The barium sulphate so formed is an insoluble product obtained from the reaction of soluble barium chloride and sulphuric acid. This is a typical example of a double replacement reaction as the both ions exchanged partners.

Thus, the assertion is false but the reason is true.