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How many molecules are in 12.5 g of NaCl?

Answer:

3.5x1024 3.5 x 10 24 carbon dioxide molecules weighs 256 g.

The concentration in volume-volume percent of the solution is: 1.6 %

To solve this problem the formula and the procedure that we have to use is:

% v/v = v(solute)/v(solution) * 100

Where

Information about the problem:

Applying the concentration formula  we get:

% v/v = v(solute)/v(solution) * 100

% v/v = (4 ml/250 ml) * 100

% v/v = 0.016 *100

% v/v =1.6 %

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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Answer: 32.06 atomic mass units

Explanation:

answer: it should be false

Answer:

Yeast is used for the leavening of bread. Yeast uses the sugars and oxygen in dough to produce more yeast cells and carbon dioxide gas. The carbon dioxide makes the dough rise which gives the bread a light and spongy texture. Yeast also works on the gluten network.

Explanation:

Answer:

Answer: The mass of product left in the test tube will be less than the initial measured mass of the reactants.

Explanation: This is because one of the products of the reaction is a gas (hydrogen) and it escapes as the reaction happens in an open system.

This is the reaction,

Mg(s) + 2HCl(aq) --------> MgCl2(aq) + H2(g)

So, evidently, only MgCl2 is left in the reaction test tube together with unreacted reactants.

But, the hydrogen gas that escapes accounts for the lesser mass at the end of the reaction.

The mass in the test tube at the end of the reaction +

the mass of Hydrogen gas that escapes = the mass of reactants before the reaction; consolidating the law of conservation of mass.

Answer:

are gases at room temperature

usually do not react with other elements

are in a group called the noble gases

are nonmetals

Explanation:

The elements in group 18 or group O are the inert elements. They have completely outermost shell and are not reactive. Every atom reacts with another in order to be like the noble gases.

It should be noted that group 17 elements are very reactive compared to the group O elements.

(19) The potential energy of the piano is 14700 J.

(20) The height of the cannon ball is 35.71 m.

This can be defined as the energy of a body due to its position in the gravitational field.

(19) To calculate the potential energy of the piano, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values intyo equation 1

(20) To calculate the heigth of the cannon ball we use the formula below.

From the question,

Given:

Substitute these values into equation 2

Hence, (19) The potential energy of the piano is 14700 J and (20) The height of the cannon ball is 35.71 m

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Answer:

Photo?

Explanation:

Answer:

Me and my friends were going to do a science experiment. Jonny’s job was to make the HYPOTHESIS. He said the “ If we mix baking soda and vinegar together, the TEMPERATURE will go down.”

So then Molly mixed the baking soda and vinegar together and checked the TEMPERATURE. We all OBSERVED as the thermometer’s TEMPERATURE went down. “ your THEORY/ HYPOTHESIS was correct!” Exclaimed Molly.

Then the whole science GROUP let out with a cheer! And wrote the information down on their EXPERIMENTAL info chart. They took a microscope and looked at the mixture because they wanted to the the little PARTICLES in the mixture. Lily CONTROLED the microscope she zoomed in and out to see the particles.

Explanation:

i hope this helps:)

Answer: element symbol: Eu.   Element Atomic Number: 63.  

Europium

Europium (Eu), chemical element, a rare-earth metal of the lanthanide series of the periodic table.

Hope this helps..... Stay safe and have a great weekend!!! :D

Answer:

Translation: Air resistance is a force that is caused by air. The force acts in the opposite direction to an object moving through the air.

Data are characteristics or information, usually numerical, that are collected through observation. In a more technical sense, data are a set of values of qualitative or quantitative variables about one or more persons or objects, while a datum (singular of data) is a single value of a single variable.

a physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.

Answer:

Kr

Explanation:

Just took the test

Answer:

30 grams

Explanation:

I got 40 wrong so I picked 30

Answer:

30 grams

Explanation:

I did the ck12

The wrong Juan did in this investigation is he multiplied by 4 and did not count it for 60 seconds to calculate the heart rate per minute.

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True.

However, overpopulation also increases if there is a shortage in the population of consumers. As a result population of producers increase.

Answer:

True (statement is correct)

Explanation:

Yeah, overpopulation occurs when the number of organisms of a species exceeds the ecosystem's carrying capacity. Hence, the given statement is correct (true).

Answer: Referring to a solution that does not completely disassociate, the conductivity would be low.

Explanation: Ions that are completely disassociated conduct better than ions that still are connected by bonds.

The kind of conductivity that would you expect insoluble compounds have is very poor or low. Due to this, these compounds do not dissociate to any appreciable extent.

Conductivity is measured through the utilization of salinity measurement. This measurement most frequently determines the parts per thousand or grams per liter.

A Siemen is also referred to as its smaller equivalents, the milli-Siemen, and the micro-Siemen, which are each one-millionth of a Siemen, is a unit used to determine the conductivity of any given solution.

Some solutions like NaCl, HCl, NaOH, etc have high electrical conductivity because they readily dissociate into their ions. While insoluble compounds do not have this capability to dissociation, so they generally have low or poor electrical conductivity.

Therefore, insoluble compounds generally have low or poor electrical conductivity.

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Answer:

Explanation:

yes leon is correct because matter is anything that takes space and also has mass in it.

thks.

Answer:

They move in fixed orbits around the nucleus.

Explanation:

In the Bohr model, it shows the electrons moving in fixed paths around the nucleus, making it easier to see and count them.

Answer:

Pretty sure the electrons orbit.

Explanation:

The balanced equation :

8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe

You just have to look for which element is in bold because the question is not clear

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Reaction

Al + Fe₃O₄→ Al₂O₃ + Fe

give a coefficient

aAl + Fe₃O₄→ bAl₂O₃ + cFe

O, left=4, right=3b⇒3b=4⇒b=4/3

Al, left=a, right=2b⇒a=2b⇒a=2.4/3⇒a=8/3

Fe, left=3, right=c⇒c=3

The equation becomes :

8/3Al + Fe₃O₄→ 4/3Al₂O₃ + 3Fe x3

8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe

Answer:

c

Explanation:

There are four boxes so each are 25%.

Red = 25%

Red and White = 50%

White = 25%

fraction of the volume of the atom that is taken up by the nucleus is 1.07x10⁻¹³Å³

Sphere volume is calculated by formula =

V=4/3(πr³) , V is volume , r is radius
Radius = diameter/2

Radius of atom = 2/2=1

Radius of nucleus = (9.50x10⁻⁵)/2 = 4.75x10⁻⁵

now we may calculate the volume for the atom and the nucleus

atom volume = (4/3) × 3.14 × (1 )³ = 4.186 ų

nucleus volume = (4/3) × 3.14 × (4.75× 10⁻⁵)³ = 4.48 × 10⁻¹³Å³

now the fraction of volume of the atom that is taken up by the nucleus:

fraction = nucleus volume / atom volume 

fraction =4.48 × 10⁻¹³/4.186 = 1.07x10⁻¹³Å³

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Answer:

ionic bonding occurs when unstable atoms donates one or more valence electrons to a unstable atom

Explanation:

Answer:

B) Lose electrons to form positive ions

Explanation:

No, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.

Neon belongs to the Group 18 of the periodic table.

The other elements(Helium, argon, krypton, radon, xenon) along with neon present in group 18 are known as noble gases.

All the elements of this group are unreactive and gases.

All these gases except Helium have 8 electrons in their outermost level, which is a stable electronic configuration.

As they have a stable electronic configuration, they don’t have any tendency to accept electrons from other elements or donate their electrons, which makes them unreactive.

Thus, neon normally does not form any compounds because neon has eight electrons in its outermost shell and is unreactive.

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Answer:

Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. When they attach to other atoms, some of their electrons change energy levels.

Explanation:

Answer:

c

Explanation: