The diagram shows the box for an element in the periodic table.
What is the atomic mass of the element shown?

A. 11

B. 23.0

C. 34.0

D. 12

Answer:

It is true answer. Ozone = O3

Explanation:

land.

I think it is the answer

Answer:

land .......................

Answer:

b).   0.732

Explanation:

52g Na₂SO₄ x     1 mol Na₂SO₄       x      2 mol Na

                          -------------------------      --------------------  =  0.732 mol Na

                           142.04 g Na₂SO₄       1 mol Na₂SO₄

Atomic Mass Units

Na₂ = 22.99 x 2 = 45.98

S     = 32.06

O₄ = 16 x 4 = 64

Na₂SO₄ = 45.98 + 32.06 + 64 = 142.04

There are 2 moles of Na in 1 mole of Na₂SO₄

Answer:

Their speed = 69.9043 miles per hour

Their speed = 112.5 kilometers per hour

Explanation:

Answer:

La fuerza gravitacional entre el planeta y el Sol aumenta.

Explanation:

Answer:

Atomic mass of Sodium is 22.9897 u. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The unit of measure for mass is the atomic mass unit (amu). One atomic mass unit is equal to 1.66 x 10 -24 grams.

Explanation:

Answer:

7.06

Explanation:

because its improper

Answer:

Protons have a positive charge. Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Since opposite charges attract, protons and electrons attract each other.

Explanation:

Answer:

It is getting thicker and keeping the Earth warmer.

Answer:

it is getting thinner and keeping the earth warmer

Answer:  

Find moles of Known Substance (NaCl)

Moles of NaCl = mass ÷ molar mass

                        =  114.25 g ÷ 58.44 g/mol

                        = 1.955 mol

Use Mole Ratio of Known to Unknown (NaCl : NaClO₃) to Determine Moles of Unknown

The mole ratio of NaCl to NaClO₃ is 2 to 2 or simply 1 to 1.

This means that for each mole of NaCl produced the same number of moles of NaClO₃ was decomposed.

∴ since moles of NaCl = 1.955 mol,

then moles of NaClO₃ = 1.955 mol

Find Mass of Unknown

Mass of NaClO₃ = moles × molar mass

                           = 1.955 mol × 106.44 g/mol

                           =  208.09 g

Determine the Moles of Known (O₂)

moles of O₂ = (volume × density) ÷ molar mass

                    = (68.30 L × 0.0828 g/L) ÷ 32 g/mol

                    = 0.177 mol

Use Mole Ratio of Known to Unknown (O₂ : NaClO₃) to Determine Moles of Unknown

Mole ratio of O₂ : NaClO₃ is 3 : 2. Therefore for each mole of oxygen produced, ²/₃ the moles of NaClO₃ is produced.

∴ if moles of O₂  =  0.177 mol

then moles of NaClO₃ =  0.177 mol × ²/₃

                                     = 0.118 mol

Find the Number of Particles of Unknown

Number of particles  = moles × Avogadro's Number

                                  = 0.118 mol × (6.022 × 10²³ particles/mol)

                                  =  7.11 × 10²² particles

Answer:

$500

Explanation:

G00gle.

Explanation:

physical changes : boiling water, freezing water, a pencil being sharpened.

chemical change : rotting cheese, exploding dynamite.

Answer:

boiling water

a pencil being sharpened

freezing water

Explanation:

A change that does not lead to any difference in chemical composition of a substance is known as a physical change.

For example, shape, size, mass, volume, density, boiling point, etc of a substance are all physical properties.

On the other hand, changes that lead to bring change in chemical composition of a substance is known as a chemical change.

For example, exploding dynamite, rotting cheese etc are all chemical changes.

Chemical change is the change in which there is rearrangement of atoms and the new substances get formed.

Boiling water only changes the phase from liquid to gas and thus is a physical change.

Pencil on being sharpened only gets smaller in size and thus is a physical change.

exploding dynamite would result into formation of new substances and hence a chemical change.

Freezing water only changes the phase from liquid to solid and thus is a physical change.

Rotting cheese would result in formation of new substances and hence a chemical change.

Therefore, we can conclude that following are the physical changes in matter.

boiling water.

a pencil being sharpened.

freezing water.

Answer:

argan can exist freely in nature because it has stable configuration whereas sodium atom cannot exist freely nature because do not have stable configuration.

Explanation:

brainiest!!!!!

Because that's the correct answer

Answer:

halogens group 7A on the periodic

table

the fire spreading is what represents the form of heat transferring from one atom to another within an object and direct contact

Answer:

batqyqy6w

Explanation:

We may suspend accounts that violate the Brainly Code of Conduct. Look for a follow-up email.  

Answer:

That would be ATP, hope this helps! :)

Explanation:

Percent errors tells you how big your errors are when you measure something in an experiment. Smaller percent errors mean that you are close to the accepted or real value. For example, a 1% error means that you got very close to the accepted value, while 45% means that you were quite a long way off from the true value.

Answer:

The answer is A.) leaving a copper penny in vinegar until it turns green.

All the other options are physical changes, as you can separate the two mixtures.

I hope this helps you! :)

Answer:

The produced mass of copper should equal the starting mass of copper.

Answer:

Because combustion is a chemical change and not a physical change. Do, flammable and combustible gases burn and change into new substance.

As opposed to a physical change, combustion is a chemical transformation. Combustible and flammable gases do burn and transform into new substances.

Combustible materials are those that, when exposed to fire or heat, will ignite, burn, sustain combustion, or produce flammable gases in the form and circumstances anticipated for their application. Combustible materials include rubber, plastics, rubberized materials, and wood.

Depending on the environmental factors, most metals are flammable to varied degrees. With water, acids, and other chemicals, certain metals can react in ways that are hazardous. Some metals can spontaneously ignite and heat up.

To know more about Combustible visit:

https://brainly.com/question/13153771

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Answer:

its a substance

Explanation:

The scenario that supports the "one gene-one enzyme" hypothesis of metabolic disease causation is Phenylketonuria (PKU). This disease (PKU) is caused by the failure to produce a functional variant of an enzyme.

Phenylketonuria (PKU) is a metabolic inherited disorder associated with a decreased metabolism of the amino acid phenylalanine.

PKU is caused by a mutation in the gene responsible for encoding a key enzyme needed to break down phenylalanine.

Untreated PKU may lead to diverse health problems which include brain damage, intellectual disability, seizures, mental disorders, etc.

Learn more in:

https://brainly.com/question/7157066?referrer=searchResults

Answer:

The choice that we had decided on doing today factors our future because whatever choice we decide on doing in the present day can impact how our life will play out in the future. ... After all, it is your life, so whatever you chose to do, you have the power to decide and create what you think would be best for you

Explanation:

Answer:

flammability, toxicity, acidity, reactivity are some examples.

sorry you left out your options.

Answer:

Where are the options

Explanation:

Can you be a little more specific about your question?