What is the best definition of
molecule?
A. A molecule is an atom that cannot be broken
down.
B. A molecule is a positively charged partide.
C. A molecule is the smallest part of a substance
that is still that substance

Answer:

All are periodic changes

[And is that a todoroki pfp, I like MHA too

(・∀・) ]

The elements can also be classified into the main-group elements (or representative elements) in the columns labeled 1, 2, and 13–18; the transition metals in the columns labeled 3–12; and inner transition metals in the two rows at the bottom of the table (the top-row elements are called lanthanides and the bottom-row ...

Hello,

Elements are a group of the Periodic Table that shares common valence electron structures. They are arranged in order of increasing Atomic Number.

In modern periodic table they are classified into three parts- metals, non-metals and metalloids.

In detail:-

• Metals- Metals are those elements which donate electrons. Ex- Na, K, Rb, Mg, Ca, etc.

• Non-metals- Non-metals are those elements which accept electrons. Ex- N, O, F, Cl, etc .

• Metalloids- Metalloids are those elements which show property of both metals and non-metals. Ex- B, Si, Ge, etc.

Hope it helps...

(by Benjemin)

True.

The Mass Undergoes change only in ( Solid state to liquid state ) Ice Cube to Water .

Mass changes from mg to litre.

[tex]\huge\mathfrak\red{hope \: it \: helps}[/tex]

ANSWER:

I calculated it in g/cm^3, It equals 0.9982 g/cm^3

The density of water at 20°C is found to be 0.9982 g/mL.  

Density may be defined as the classical measurement of quantity or mass per unit of volume in a particular substance. According to mathematics, density is simply characterized as mass divided by volume. That is:

[tex]Density = \frac{Mass }{Volume }[/tex]

Density typically describes how much space an object or substance takes up in relation to the amount of matter in that object or substance.

Density only significantly depends on the mass of the body as well as the volume occupied by it. The SI unit of density is kg/[tex]m^3[/tex]. The density remarkably does not vary much with respect to the temperature.

Therefore, the density of water at 20°C is found to be 0.9982 g/mL.  

To learn more about Density, refer to the link:

https://brainly.com/question/1354972

#SPJ2

Answer:

Use the edit icon to pin, add or delete clips.

Explanation:

hfdknvd hcde

We have that this how they differ

Physical properties

Chemical Properties

From the Question we are told that

Silicon properties:

a. blue-gray color

b. brittle

c. doesn't dissolve in water

d. melts at 1410°C

e. reacts vigorously with fluorine

Physical properties

This Refer to Properties that can be seen and  Measured

While

Chemical Properties

This are Refers to the effect of the element in reactions

Therefore

Physical properties

Chemical Properties

For more information on this visit

https://brainly.com/question/17148237?referrer=searchResults

Answer:

Hydrogen is usually classified as a group 1 element since it has one valence electron, just like group 1 metals.

Explanation:

Answer:

Because to them it was just a little bit of fiction. so they don't really think it's necessary to do experiments or make detailed observation

Explanation:

it's just like how we presently today discuss about robot talking to us like humans but it's not yet come to pass .

Answer:

the surface area of a solid reactant.

temperature.  

presence/absence of a catalyst.

Answer:

Objects that can emit light energy by themselves are known as luminous objects. Objects that cannot emit light energy by themselves are known as non-luminous objects.

Explanation:

Explanation:

Luminous objects:- The objects that can emit light energy by themselves are known as luminous objects.

Objects like the sun that give out or emit light of their own are luminous objects.

Other examples of luminous bodies are Electric bulb, torch etc.

Non-luminous objects:- the objects that can not emit light energy by themselves are known as Non- luminous objects.

Objects like the moon that do not give out or emit light of their own are Non- luminous objects.

Moon is an example of a non-luminous object as we can see the moon because it reflects light from the sun.

Other examples of Non luminous bodies are pen, pencil, chair, wood etc.

Luminosity – It is defined as the luminous intensity in a particular direction; or we can say it is the apparent brightness of an image.

The brightness of a star is defined as the total energy radiated in unit time. It is related to the surface area (A) and the effective temperature (TT) ( the temperature of a black body having the same radius as the star and radiating the same amount of energy per unit area in one second ) by a form of Stefan’s law, here is given by

⇒L=AσT4⇒L=AσT4

where 

σ is the Stefan’s constant and L is the luminosity.

Note:

The laptop screen, mobile screen you are looking at right now is luminous but the page of your book is a non-luminous object, which is why you need a light on to read it.

Answer:

Water vapor molecules in the air near the can cooled when energy from the air transferred to the cold can. These water molecules slowed down, condensed to liquid water, and then froze to become ice. Your can might have some water and some ice on the outside of it.

Explanation:

Answer:

what is the story about actually.i think it's from ur lesson

Explanation:

certain breads mold easily...(fact)..

especially white bread., when exposed to any moisture, from refrigeration, or freezing..

when taken out of (cold environment), humidity in air causes molding because you take it from cold to/warm environment.

check expiration dates, keep refrigerated, and inspect 4 molding. Companies like WMART, buy in bulk, when on shelf, defrosts,, then has molding within expiration dates..

A dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.

A chemical reaction is the process by which substances called reactants are transformed to another substance known as products through the breaking up or building up of bonds between the reactants.

There are different types of chemicals reaction which includes condensation reaction.

Condensation reaction involves the combination of two smaller molecules known as monomers to for one larger molecule known as polymer with the loss of water molecule.

Condensation reaction is specifically called dehydration reaction due to the loss of water molecule that is involved.

Therefore, a dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.

Learn more here:

https://brainly.com/question/20300284

Answer:

A. neutral

Explanation:

It's net charge is 0.

Answer:

A. neutral

Explanation:

A neutron is given by formular

[tex]» \: \: {}^{1}_{0}n[/tex]

hence it's net charge is zero

Answer:  0.050 moles of NaOH

Explanation:  The molar mass of NaOH is 40.0g/mole

2.0g/40.0g/mole  =  0.050 moles (2 sig fig)

Answer: all of them

Answer:

all the above

Explanation:

i found this. there's more coming up

Comparing the data obtained online, the first group is more precise

The reason the above selection is correct is as follows;

Question: Parts of the question appear missing from a similar question online and included here;

First Group:

[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.77 \ cm&2.60 \ cm&2.80 \ cm&2.65 \ cm&2.75 \ cm&2.65 \ cm& 2.68 \ cm\end{array}\right][/tex]

Second Group

[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.70 \ cm&2.78 \ cm&2.62 \ cm&2.65 \ cm&2.75 \ cm&2.80 \ cm& 2.60 \ cm\end{array}\right][/tex]

Calculations for the first group:

The average = (2.77 + 2.60 + 2.80 + 2.65 + 2.75 + 2.65 + 2.68)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range of the average = ±0.2/2 = ±0.1

The precision of the first measurement is 2.7 ± 0.1 cm

Calculations for the second group:

The average = (2.70 + 2.78 + 2.62 + 2.65 + 2.75 + 2.80 + 2.60)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range from the average = ±0.2/2 = ±0.1

The range of values from the average is approximately ±0.1 cm

The precision of the first measurement is 2.7 ± 0.1 cm

Method to determine precision:

Precision is given by the finding the average deviation and the standard deviation as follows;

[tex]\mathbf{Average \ deviation} = \dfrac{\sum \left | x - \mu \right |}{n}[/tex]

[tex]\mathbf{Standard\ deviation} =\sqrt{\dfrac{\sum \left ( x - \mu \right )^2}{n}}[/tex]

Where;

μ = The mean or average = 2.7

n = The number of items (count) of the data = 7

For the first group, we have;

[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.07 + 0.1 + 0.1 + 0.05 + 0.05 + 0.05 + 0.02 }{7} = \mathbf{0.062857}[/tex]

The average deviation of the first group = 0.062857

∑(x - μ)² ≈ 0.0328

[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0328}{7}} \approx \mathbf{0.068452}[/tex]

For the second group, we have;

[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.0+ 0.08 + 0.08 + 0.05 + 0.05 + 0.1 + 0.1 }{7} = \mathbf{0.06571428571}[/tex]

∑(x - μ)² ≈ 0.0378

[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0378}{7}} \approx \mathbf{0.073485}[/tex]

By using the average deviation, and standard deviation values, the deviation of the second group is more than the first group and therefore the first group is more precise

Learn more about accuracy and precision here:

https://brainly.com/question/11992940

Answer:

The molar mass of [tex]C_3H_8O_2[/tex] (rounded to three significant figures) is 76.1 amu.

Step-by-step explanation:

Hey there!

To answer this question, you will need access to a periodic table. You need to know the atomic masses of carbon (C), hydrogen (H), and oxygen (O) in order to answer this question. With that out of the way, let's begin!

We have a chemical formula: [tex]C_3H_8O_2[/tex].

The first thing we should do is locate C, H, and O on a periodic table and figure out the atomic masses for each element. This will help us determine the total molar mass of the substance.

If we locate C on a periodic table, we see that its atomic mass is roughly 12.01 amu (atomic mass units). Then, we have a subscript of 3, so we simply multiply the subscript by the given atomic mass in order to find the atomic mass of the three atoms of carbon.

[tex]3 \times 12.01 = 36.03 \text{ amu}[/tex]

This means that C accounts for 36.03 amu of the molar mass of the substance.

Using the same principle as before, we want to find the atomic mass of one atom of H. This is 1.008, so we will multiply 1.008 by the eight atoms (pay attention to the subscript) in order to find the atomic mass of hydrogen in the substance.

[tex]8 \times 1.008 = 8.064 \text{ amu}[/tex]

This means that H accounts for 8.064 amu of the molar mass of the substance.

* An important note to add is that we should never round our values until the end of the problem so we make sure to get as close as possible (this is why you learn about accuracy and precision in a chemistry class).

Finally, we want to find the atomic mass of O in the substance, so we'll use the same method as before and locate the atomic mass of one atom of oxygen. We find that this is 15.999, which would definitely round to 16.00, but remember the rules for rounding in chemistry in order to be as accurate as possible. Since our subscript is 2, we know that there are two oxygen atoms, so we will multiply the atomic mass of oxygen by 2.

[tex]2 \times 15.999 = 31.998 \text{ amu}[/tex]

This means that O accounts for 31.998 amu of the molar mass of the substance.

After you have determined the atomic masses of the atoms in the chemical substance, you have to add these together. This is performed with simple addition.

Now, let's add these together.

[tex]36.03 \text{ amu} + 8.064 \text{ amu} + 31.998 \text{ amu} = 76.092 \text{ amu}[/tex]

Therefore, the total atomic mass is 76.092 amu.

Significant figures are used to determine the accuracy of a problem. A basic rule is to use scientific notation to determine how to meet the significant figure request. Since we are rounding to three significant figures, we want to make sure these three figures are significant. There are three basic rules to remember when computing significant figures:

Therefore, since we need three significant figures, we have to round our value first and then determine the appropriate number of significant figures.

Since we have determined that 76.1 fits our requirements for three significant figures, we can safely determine that the molar mass of [tex]C_3H_8O_2[/tex], as determined, is 76.1 amu.

= 3 × Mass of C + 8 × Mass of H + 2 × Mass of O

= (3 × 12.01 + 8 × 1.008 + 2 × 15.999) g/mol

= (36.03 + 8.064 + 31.998) g/mol

= 76.092 g/mol

Answer:

76.092 g/mol

Hope you could get an idea from here.

Doubt clarification - use comment section.

Answer:

8

Explanation:

Electronic configuration of Calcium = 2, 8, 8, 2

M shell = 3rd energy level

Maximum number of shells in m shell is 8

Answer:

20 m/s

Explanation:

solution,

initial velocity (u)=0 m/s

Distance covered(s)=100m

Time taken(t)=10 seconds

Acceleration (a)=2m/s²

Now,

By using first equation of motion, we have

v=u+at

=0+2×10

=20 m/s

I hope it helped U

stay safe stay happy

Answer:

Option 1 Data

Answer:

data

Explanation:

that is the answer

please 5 stars

Answer:

it's yellowish in color plz Mark me as brainliest

Answer:

It's a yellowish color like copper

Answer:

The answer is the 4th one

The statement about metals and nonmetals that is correct is: "The  Metals can be hammered into thin sheets, and nonmetals are brittle."

Metals are found mostly towards the left hand side of the periodic table. Non-metal character increases as you move towards the right hand side of the table.

One common property of metals is that they are malleable; this means that they can be hammered into sheets while a common property of nonmetals is that most of them are brittle.

Learn more: https://brainly.com/question/10714037

Answer:

Overall, the main function of the corolla is to assist in the reproductive process of the plant. The petals of the corolla are designed to aid in pollination, and therefore, increase the chance of successful reproduction of the flower.

to assist in the reproductive process of the plant...

Answer:

1 = 252g, 2 = 2mL, 3 = 1.5mL, 4 = 3g, 5 = 225g, 6 = 0.92g/mL, 7 = 0.75g/mL, 8 = 0.71g/mL, 9 = 1.9mL, 10= 1.11mL, 11 = 76.9g

Explanation:

This problem is testing how well you can move around the equation D = m/v where D = Density (g/mL), m= mass of sample (g), v = volume of sample (mL).

Answer:

B and A.

Explanation:

Many of the great scientists were religious. But the answer is not D.

A scientist may have strong opinions. That was certainly true of Newton. Most of the time he was right. Still the answer is not C. Science requires an open mind.

The answer is between A and B. Many discoveries were made looking at the natural world. That may provide the inspiration. But I don't think it is the answer. I'm going to say A

B is the other answer. Between A and B many scientific truths have been discovered.

Answer:

D) sodium chloride

i think this is the answer

Explanation:

Answer:

And the ans is yellowish