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Answer:

A

Explanation:

Solute is what is being dissolved.

Solute is cocoa powder when we make a cup of hot chocolate ,therefore option (a) is correct.

A solute is a substance that is dissolved in a solvent to form a solution.

The concentration of a solute in a solution is a measure of how much of the solute is dissolved in the solvent.

Characteristics of solute -:

Solute is cocoa powder when we make a cup of hot chocolate ,hence option (a) is correct.

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Answer:

b. 3.66x10²³ atoms of chromium.

Explanation:

First we calculate how many moles are there in 31 grams of chromium, using its molar mass:

Then we calculate how many atoms are there in 0.608 moles, using Avogadro's number:

The correct answer is thus option b. 3.66x10²³ atoms of chromium.

Natural radioactive elements are those that spontaneously radiate in nature and have an atomic number between 82 and 92. In dirt, air, water, rocks, plants, food, uranium—a radioactive element—can be discovered.

When an element's atoms contain excess neutrons or protons, the extra energy produced in the nucleus causes the atom to lose its equilibrium or become unstable. if and how radioactive particles can become stable. Radiation is produced by radioactive atoms' unstable nuclei.

Compared to beta and gamma particles, alpha particles represent the most dangerous internal threat. The most hazardous methods of exposure to radioactive elements that release alpha and beta radiation are ingestion, inhalation, absorption, and injection. Gamma radiation is the outside hazard that causes the most damage.

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8 acidic oxides, take your pick <3

Aluminium oxide.

Silicon dioxide.

Phosphorus oxides.

Sulfur oxides.

Chlorine oxides.

Iron oxides.

Chromium oxides.

Vanadium oxides

Answer:

neutrons = 20

Explanation:

No. of Neutrons = Mass No. - Atomic No

= 39 - 19

=20

Answer:

1) What is the element? Potassium

2) how many neutrons does it have? 20

3) If it is a neutral atom how many electrons does it have?​ 39

Please mark as brainliest if answer is right

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Answer:

1. The final temperature of the metal is 111 °C.

2. The change in the temperature of the water is 6.2 °C

3. The change in the temperature of the metal is 40.6 °C.

Explanation:

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

Initial temperature of metal (Tₘ₁) = 70.4 °C

Initial temperature of water (Tᵥᵥ₁) = 23.6 °C

Equilibrium temperature (Tₑ) = 29.8 °C

1. Determination of the final temperature of metal.

We'll begin by calculating the change in temperature of the metal. This can be obtained as follow:

Initial temperature of metal (Tₘ₁) = 70.4 °C

Equilibrium temperature (Tₑ) = 29.8 °C

Change in temperature of metal (ΔTₘ) =?

ΔTₘ = Tₘ₁ – Tₑ

ΔTₘ = 70.4 – 29.8

ΔTₘ = 40.6 °C

Finally, we shall determine the final temperature of the metal. This can be obtained as follow:

Initial temperature of metal (Tₘ₁) = 70.4 °C

Change in temperature of water (ΔTₘ) = 40.6 °C

Final temperature of metal (Tₘ₂) =?

40.6 = Tₘ₂ – 70.4

Collect like terms

40.6 + 70.4 = Tₘ₂

111 = Tₘ₂

Tₘ₂ = 111 °C

Thus, the final temperature of the metal is 111 °C

2. Determination of the change in the temperature of the water.

Initial temperature of water (Tᵥᵥ₁) = 23.6 °C

Equilibrium temperature (Tₑ) = 29.8 °C

Change in temperature of water (ΔTᵥᵥ) =?

ΔTᵥᵥ = Tₑ – Tᵥᵥ₁

ΔTᵥᵥ = 29.8 – 23.6

ΔTᵥᵥ = 6.2 °C

Therefore, the change in the temperature of the water is 6.2 °C

3. Determination of the change in the temperature of the metal.

The change in the temperature of the metal is 40.6 °C.

Please solution 1 above for explanation.

Answer:

29.8 C

6.2 C

-40.6 C

:)

Explanation:

Answer:

B. Chlorine gas is yellow-green in color.

The number of moles of helium (He) needed to make the balloon rise is 0.043 moles.

The number of moles of a gas can be calculated using the following expression:

V₁/n₁ = V₂/n₂

Where;

Avogadro’s law to predict what will happen to the volume of a sample of gas as we change the number of moles. Because V/n is a constant for any given sample of gas (at constant P and T).

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas.

0.46/0.0226 = 0.865/n

20.3539823n = 0.865

n = 0.043 moles

Therefore, 0.043 moles is the number of moles of the gas when the balloon rises.

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Answer:

I think the answer is 14 I am not sure

Answer:

Reactants collide to form a transition state.

Explanation:

So sorry if I’m wrong but I feel this is right

To solve such this we must know the concept of chemical reaction. The correct option is option B that is atoms in one compound switch places with atoms in another compound.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.

There are so many types of chemical reaction reaction like combination reaction, double displacement reaction, combustion reaction, displacement reaction. "Reactants collide to form a transition state" describes the first part of a chemical reaction.

Therefore "Reactants collide to form a transition state" describes the first part of a chemical reaction. The correct option is option B.

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Answer:

a

Explanation:

The formation of ion occurs when an atom that is said to be neutral gains or losses electrons.

At the time it gains electrons, it is regarded that a negative ion (anion) is formed.

When it loses electron, it is regarded that a positive ion (cation) is formed.

Atomic number = No of protons and electrons occurring in a neutral atom.

Given that:

Protons = 14

electron = 18

Net Charge = no of proton - no of electron

= 14 - 18

= -4

Mass number = 14 + 15 = 29

So, the chemical symbol = [tex]Si^{-4}[/tex]

For ion with

27 proton, 32 neutrons and 25 electrons

Net charge = 27 - 25

= +2

Mass number = 27 + 32 = 59

Thus, the chemical symbol = [tex]Co^{+2}[/tex]

Answer:

4.44 moles

Explanation:

first u have to change the units into dm cube.

cm cube÷1000=dm cube

185cmcube÷1000= 0.185dm cube

24dm cube= 1 mole(formula)

0.185dm cube × 24dm cube=4.44 moles

Answer:

Mass of CaCl2 = 4.1625 grams

Explanation:

We will recall that:

For solution: Molarity = [tex]\dfrac{moles \ of \ solute }{volume \ of \ solution (L)}[/tex]

[tex]1.5 = \dfrac{moles}{0.025 }[/tex]

Moles = 0.0375 moles

Mass = no of moles × molar mass(MM)

Molar mass of CaCl2 = 111 g/mol

Mass = 0.0375 mol × 111 g/mol

Mass of CaCl2 = 4.1625 grams

Answer:

Why do chemists use the mole as a counting unit? Because chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance. ... The discovery enabled scientists to classify certain chemical reactions as transfers of electrons between atoms.Explanation:

Chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance.

It is not possible to vell with a single atom or molecule because we

can't count them.

Chemists have set a number of particles with which to toil that is convenient. As molecules are very small.

Thus,  chemists use a counting unit called the mole to measure the amounts of a substance.

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Mass can be calculated by using moles which can be further calculated from multiplication of Molarity to volume. Therefore, the molarity of the HCl solution is 3M. the correct option is option C.

Molarity can be calculated by dividing  number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution.

Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution

Mathematically,

2HCl + Ca(OH)[tex]_2[/tex] [tex]\rightarrow[/tex] CaCl[tex]_2[/tex] + 2H[tex]_2[/tex]O

Molarity of HCL× Volume of HCL=Molarity of Ca(OH)[tex]_2[/tex] ×Volume of  Ca(OH)[tex]_2[/tex]

Molarity of HCL× 1.00 L=1.50 M× 2.00 L

Molarity =3M

Therefore, the molarity of the HCl solution is 3M. the correct option is option C.

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Answer: The answer is Conduction

Answer:

Conduction

Explanation:

Conduction happens when materials or objects are in direct contact with each other. The molecules in the warmer object vibrate faster than the ones in the cooler object.

Answer:

Get a controlled environment, such as a pool or even a bowl. Pour some oil in it then you can test your solutions without causing any damage.

Explanation:

Answer:

Capacity is the amount of liquid a container can hold. Mass is how much space an object takes up.

Explanation:

All the others are incorrect.

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.025  is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Substituting values in equation 1

0.4M=number of moles of solute/0.25

number of moles of solute=0.025moles

Therefore, 0.025  is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.

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Answer:

Explanation:

To break apart a molecule of H2So4 is much higher than HCl although HCl is an ionic bond it is only bonded to one hydrogen. While H2So4 is bonded to two of them, aswell as its structure being much more complex. The energy to break Ba(h)2 is equal in both.

The global climate was colder than normal from 1650 to 1700. This conclusion is most likely correct. Therefore, option A is correct.

Global climate refers to how heat and precipitation are distributed over a lengthy period of time on Earth's surface. The average temperature of the planet is kept at roughly 60°F (16°C) by heat from the sun, which is within the range required for biological life and the preservation of the planet's liquid water reserves.

Global climate change is the collective term for all the Earth's average long-term changes. Along with changing precipitation patterns and higher temperatures, these also include the consequences of global warming, such as: rising sea levels alpine glaciers are thinning.

Thus, option A is correct.

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Your question is incomplete probably your question was

The graph below shows the averaged sunspots from 1610 to 2007. The graph shows sunspot number on the y axis and years 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, and 2000 on the x axis. The graph rises and falls in a cyclic order in gaps of approximately 10 years. The number of sunspots observed in 1610 was 40, in 1650 it was 5, in 1700 it was 10, in 1750 it was 90 and the number of sunspots in 1800 was 50. The number of sunspots observed in 1850 was 130 and the number of sunspots in 1900 was 10. The number of sunspots observed in 1950 was 150 and the number of sunspots observed in 2000 was 30. Based on the graph, which of these conclusions is correct? Some of the previously warm regions became colder from 1650 to 1700. Some of the previously cold regions became warmer from 1600 to 1700. Some of the previously warm regions became warmer from 1610 to 1700. Some of the previously cold regions became colder from 1900 to 1950.

-33⁰C

Explanation:

Charles Law states V/T initial = V/T final

T must be in Kelvin.

100/300 = 80/x

(27⁰C + 273 = 300

100x = (300)(80)

100x = 24,000

x = 240⁰K

240 - 273 = -33⁰C

By applying Boyle's law, the new volume of this gas is equal to: D. 4.0 L.

Given the following data:

Initial volume = 3.0 L.

New pressure = 1.5 atm.

Initial pressure = 2.0 atm.

In order to calculate the new volume of this gas, we would apply Boyle's law. Mathematically, Boyle's law is given by this formula:

PV = k

P₁V₁ = P₂V₂

Where:

Making V₂ the subject of formula, we have:

V₂ = (P₁V₁)/P₂

Substituting the given parameters into the formula, we have;

V₂ = (2.0 × 3.0)/1.5

V₂ = 6.0/1.5

V₂ = 4.0 L.

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Answer:

D. 4.0 Liters

Explanation:

I took the exam

Answer: C) All of the rabbits in a forest, as well as their predators and food plants

Explanation:

The community refers to all living things in a certain area including plants and animals. If the given area is a forest therefore, the rabbit being a living thing, as well as its predators and the plants that it relies on will be considered the community.

This is not unlike a human community where everyone in a given area is considered to be part of the community.

Answer:

C

Explanation:

I got this question on an edusmart.

Answer:

B. 28.1 amu

Explanation:

Answer: the substance is from an animal source

Explanation:

Answer:

A. one potassium and one iodine

Explanation:

K is a metal and I is a nonmetal, so K will lose electrons to form a cation and I will gain electrons to form an anion. Together, they will be bonded through an ionic bond. To determine how many electrons they gain or lose and how many atoms are in the chemical formula, we need to consider the octet's rule: an atom will gain, lose, or share electrons until it has 8 electrons in its valence shell.

We need 1 K⁺ and 1 I⁻ to form the neutral salt KI.

Sublevels are indicated by letters s, p, d, and f.

How do write Electronic configuration?

Electron configurations have a standard notation that tells you the principle energy levels and sublevels that electrons occupy. here is Sulphur:

The atomic number of Sulphur is 16.

the electronic configuration of Sulphur is 1s2 2s2 2p6 3s2 3p4.

The 4s sublevel has lower energy than the 3d sublevel,

so, it fills next.

One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. According to its location on the periodic table, each element's electron configuration is distinct.

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