Which ion would represent the ion of an element from Group 2A?
A2+
Y3+
X2-
Z+

Answer:

3 electrons

Explanation:

Answer:

Explanation:

The number of carbon dioxide molecules can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 3.25 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

I believe its A. Mass

Explanation:

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. For example, the electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors.. Other intensive properties include color, temperature, density, and solubility.

Answer:

B. Magnetism

Explanation:

Hope this helps! :))
Sorry for late answer

Answer:

No mass loss

Explanation:

The mass of ice and the water in the different state are equal because the same of quantity of matter is present in both state of matter of matter.

1. solute is the substance that is being dissolve,while solvent is dissolving medium

2.saturated is solution that contain maximum amount of solut that capable of being dissolve and supersaturated is solution that contain less amount or medium of solut that capable being dissolve : example vinger

3. is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. For example, two molecules of hydrogen would be written as 2 H2, and two molecules of water would be written 2 H2O . yes it's can be change only in caseWhen you balance an equation you can only change the coefficients

Answer:

The official measurement unit for energy is the Joule (J). Among the most common units measuring energy mention should be made of the kilowatt/hour (kWh), used especially for electric energy (in fact it is used to calculate electricity bills).

Answer:

They show you  how to do it sweetie

Explanation:

123456789 Common math

A “supersaturated” solution contains more dissolved material. supersaturated solutions lies in the temperature of the water. more sugar will dissolve in hot water than in cold. Meaning that by separating the 2, only the supersaturated sugar would dissolve leaving the regular sugar untouched.

The molecular mass​ : 81.72 g/mol

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm , N/m²

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m2, v= m³)

T = temperature, Kelvin  

P = 760 mmHg=1 atm

T = 300 K

V = 0.3 L

Number of moles :

[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1\times 0.3}{0.082\times 300}\\\\n=0.0122[/tex]

The molecular mass (MW) :

[tex]\tt MW=\dfrac{mass}{n}\\\\MW=\dfrac{0.997~g}{0.0122}\\\\MW=81.72~g/mol[/tex]

Answer:

a1

The main difference between SPECT and PET scans is the type of radiotracers used. While SPECT scans measure gamma rays, the decay of the radiotracers used with PET scans produce small particles called positrons. A positron is a particle with roughly the same mass as an electron but oppositely charged.

Explanation:

a2

While imaging tests such as X-rays can show what the structures inside your body look like, a SPECT scan produces images that show how your organs work. For instance, a SPECT scan can show how blood flows to your heart or what areas of your brain are more active or less active.

a3

PET and SPECT have been extensively evaluated as diagnostic procedures for dementia. Substantial progress has been made in developing radioligands that bind to amyloid deposits in the brain, which should provide new opportunities for early diagnosis and treatment monitoring in Alzheimer's disease

a4

What are the disadvantages of spect as compared to pet?

However, SPECT has issues, including long scan times and low-resolution images prone to artifacts and attenuation. Some artifacts can easily be misidentified as perfusion defects. SPECT also does not provide a quantifiable estimate of the blood flow, whereas PET does, experts say.

Answer:

"A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. The combustion of hydrogen gas produces water vapor." and "A synthesis reaction occurs when two or more reactants combine to form a single product. ... In a double replacement reaction, two compounds exchange elements. A combustion reaction occurs when a substance reacts quickly with oxygen. Combustion is commonly called burning"

Explanation:

I tried

Explanation:

I think its a solution just me tell me in comments if right

Answer:

A solution

Explanation:

Sugar is soluble in water and would dissolve into the water to form a solution.

Answer:

I honestly dont know but its cool problably from water fill or from the waves going to much

Explanation:

Answer:

The answer would either be Carbon or Silicon.

Explanation:

Answer:

not sure about the first one, but i know SDS provides information about the last 3.

Explanation:

Answer:

The answer is D- make sure you give good rate

Answer:

C)  the relative number of moles taking part in the reaction

Explanation:

From a balanced chemical equation, it is always possible to determine the relative number of moles taking part in a chemical reaction.

The number of moles is the amount of the reacting specie that makes up a chemical reaction.

Answer:

See explanation

Explanation:

If we look at the electron configuration closely, we will discover that the element must have had a ground state electron configuration of 2,4.

This is because, the innermost shell usually holds two electrons while the outer shells hold eight electrons each. The four electrons must be accommodated in the second shell in the ground state configuration of the compound.

However, when the atom is excited, one electron from this shell may move to the third shell to give the excited state configuration 2-3-1 as shown in the question.

Answer:

I just need points

Explanation:

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Answer:

117g

Explanation:

Given parameters:

Number of moles = 2moles

Unknown:

Mass of NaCl  = ?

Solution:

To solve the problem, we need to use the expression below;

    Mass of NaCl  = number of moles x molar mass

Molar mass of NaCl  = 23 + 35.5  = 58.5g/mol

So;

Insert the parameters and solve;

     Mass of NaCl  = 2 x 58.5  = 117g

Explanation:

i believe you meant particles*

Answer:

to find the number of electrons an element has locate it on the periodic table of elements find the atomic number and note the number of protons because they are naturally electrically neutral

Answer:

M-A=N

Explanation:

M-A=N

Here is an example.

The equation above means that the atomic number (A) subtracted from the average atomic mass (M) equals the combined amount of neutrons and protons. Since we know that 35 17Cl is Chlorine (this is because Chlorine (Cl) is the 17th number on the periodic table and has the average atomic mass of 35), we can insert our data into the equation and end up with the following:

35-17=18.

From here, we can tell that we have a mix of neutrons and protons, with the total being 18. Since the atomic number is 17, we can reasonably assume that there are 17 protons and 1 neutron.

But we still need to find the number of electrons. Fortunately, the number of electrons is always equivilant to the number of protons and the atomic mass, so we know that the number of electrons is 17.

So, we have;

17 Protons

1 Neutron

17 Electrons

Answer:

630gC₆H₁₂

Explanation:

How many grams are in 7.5 moles of C₆H₁₂?

C₆:12.011×6=72.066

H₁₂:1.008×12=12.096

72.066+12.096=84.162

84.162g/mol C₆H₁₂

7.5 molC₆H₁₂ ×84.162g/molC₆H₁₂= 631.215gC₆H₁₂

Answer:

Here you go

Explanation:

Answer:

Elements are made of only one kind of atom

Compounds are made of 2 or more elements chemically bonded together

Explanation:

Its right there????