Question 5 of 5
The rows in the periodic table are called periods. What is true about elements
in the same period?
O A. They have the same atomic mass.
B. Their atomic numbers increase by 1 from left to right.
C. Their magnetism increases in strength from left to right.
D. They have similar chemical properties.
SUBMIT

Answer:

166.704

Explanation:

Answer:

ahhh i d kkkkk im so so so so sorry

Explanation:

Answer:

2,959.36

Explanation:

There are 2959.36 milligrams present in 2.89 x [tex]10^{24}[/tex]  CO2 molecules.

The smallest component of a substance which possesses both its chemical as well as physical characteristics. One or even more atoms make up molecules.

Such a measure of mass as well as weight that weighs 0.0154 grains or one-thousandth of a gram.

Calculation of milligram in CO2 molecule.

Mass = No. of molecule / molar mass.

Molar mass = 44.02 g/mol.

Mass = 2.89 x [tex]10^{24}[/tex]  /[tex]6.023 * 10^{23}[/tex]× 44.02 g/mol.

Mass = 2959.36 milligrams

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Answer:

180 degrees

Explanation:

sp hybridization generates orbitals that overlap linearly, generating a straight line. This leads to an angle measurement of 180 degrees.

Answer:

Metabolism is the set of life-sustaining chemical reactions in organisms. The three main purposes of metabolism are: the conversion of the energy in food to energy available to run cellular processes

Explanation:

Answer:

vinegar and soda

Explanation:

Mixing baking soda (sodium bicarbonate) and vinegar (acetic acid) causes a chemical reaction that produces a salt (sodium acetate) and water, as well as carbon dioxide gas.

Answer:

Fertilizer and vinegar

Explanation:

Fertilizer is a base, and vinegar is an acid. Salt is made when you combine a base and an acid. Plus, I got a 100% on the test and this was my answer.

Answer:

at least 3 ppm in hot tubs/spas

Explanation:

The mass in grams of 3.011 x 10²³ atoms of F is 9.5 g.

The mass in grams of  1.50 x 10²³ atoms of Mg is 5.98 g.

The mass in grams of  4.50 x 10¹² atoms of Cl is 2.65 x 10⁻¹⁰ g.

The mass in grams of  8.42 x 10¹⁸ atoms of Br is 1.12 x 10⁻³ g.

The mass in grams of  25 atoms of W is 3.1 x 10⁻²¹ g.

The mass in grams of  1 atom of Au is 3.27 x 10⁻²² g.

The mass in grams of 3.011 x 10²³ atoms of F is calculated as follows;

6.023 x 10²³ atoms = 19 g of F

3.011 x 10²³ atoms F  = ?

= (3.011 x 10²³ x 19 g)/(6.023 x 10²³)

= 9.5 g

The mass in grams of  1.50 x 10²³ atoms of Mg is calculated as follows;

6.023 x 10²³ atoms = 24g of Mg

1.5 x 10²³ atoms F  = ?

= (1.5 x 10²³ x 24 g)/(6.023 x 10²³)

= 5.98 g

The mass in grams of  4.50 x 10¹² atoms of Cl is calculated as follows;

6.023 x 10²³ atoms = 35.5 g of Cl

4.5 x 10²³ atoms Cl  = ?

= (4.5 x 10¹² x 35.5 g)/(6.023 x 10²³)

= 2.65 x 10⁻¹⁰ g

The mass in grams of  8.42 x 10¹⁸ atoms of Br is calculated as follows;

6.023 x 10²³ atoms = 80 g of Br

8.42 x 10¹⁸ atoms Br = ?

= (8.42 x 10¹⁸  x 80 g)/(6.023 x 10²³)

= 1.12 x 10⁻³ g

The mass in grams of  25 atoms of W is calculated as follows;

6.023 x 10²³ atoms = 74 g of W

25 atoms W = ?

= (25  x 74 g)/(6.023 x 10²³)

= 3.1 x 10⁻²¹ g

The mass in grams of  1 atom of Au is calculated as follows;

6.023 x 10²³ atoms = 197 g of Au

1 atom of Au = ?

= (1  x 197 g)/(6.023 x 10²³)

= 3.27 x 10⁻²² g

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Answer:

2 Na atoms

1 C atom

3 O atoms

gram formula weight = 105.99 g

hope this helped :)

Explanation:

→ Na

# of Atoms - 2

→ C

# of Atoms - 1

→ O

# of Atoms - 3

→ gram formula weight (g) : 105.99 g

Answer:

C. naturally uncombined with other elements.

Explanation: Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.

Answer:

Density if iron shot = 7.92 g/ml (2 sig. figs.)

Explanation:

By definition, density is mass per unit volume. That is,

Density (D) = mass(m)/Volume(V)

mass(m) = 28.5g (given)

Volume(V, of iron shot) = 49.10ml - 45.5ml = 3.6ml

Substitutuing into D = m/V = 28.5g/3.6ml = 7.9166667 g/ml (calc.ans)

≅ 7.92 g/ml (2 sig. figs.)

Hope this helps. :-)

Answer:

Incomplete combustion produces carbon monoxide along with some carbon dioxide.  Water is always produced during combustion.  If the fuel is sulfur containing, carbon disulfide will result as well.

Have a happy day! <3Miss Hawaii

Explanation:

Answer:

For the CH3- structure use the periodic table to find the total number of valence electrons for the CH3- molecule. Once we know how many valence electrons there are in CH3- we can distribute them around the central atom with the goal of filling the outer shells of each atom.

In the Lewis structure of CH3- structure there are a total of 14 valence electrons.

Also note that you should put the CH3- Lewis structure in brackets with as 1- on the outside to show that it is an ion with a negative one charge.

----- Steps to Write Lewis Structure for compounds like CH3- -----

1. Find the total valence electrons for the CH3- molecule.

2. Put the least electronegative atom in the center. Note: Hydrogen (H) always goes outside.

3. Put two electrons between atoms to form a chemical bond.

4. Complete octets on outside atoms.

5. If central atom does not have an octet, move electrons from outer atoms to form double or triple bonds.

Lewis Structures, also called Electron Dot Structures, are important to learn because they help us understand how atoms and electrons are arranged in a molecule. This can help us determine the molecular geometry, how the molecule might react with other molecules, and some of the physical properties of the molecule (like boiling point and surface tension).

Explanation:

CH3CNO can be represented by at least three different but valid Lewis structures called resonance forms, or resonance structures, shown below.

Answer:

I would say baking powder maybe or you should try tap water

Answer:

1st one - tap water (ill go over them one by one to help you understand why)

Its honestly rather vinegar or tap water but if I would go with tap water however I could be wrong. I don't take your class lol

Step by step:

First, tap water includes a lot of ions and contaminants. As a result, tap water only contains ions capable of conducting electricity. As a result, tap water is an excellent electrical conductor.

2nd) Ammonia and baking soda are both weak bases. When weak electrolytes dissolve in water, the resulting solution has a low conductivity.

Third, because it releases H+ and CH3COO- ions, the mobility of these ions in the solution assists in electrical conduction. As a result, vinegar is a good electrical conductor.

4th) When dissolved in water, soda compounds (chemicals mostly containing sodium) include ions, and ions assist conduct electricity. As a result, it does not conduct because it lacks ions or charged particles.

The covalent bond has been formed by the atom with the difference in the electronegativities and the presence of loan pair for an unsaturated bond.

The covalent bond has been formed between the atoms when there has been the sharing of electrons. The presence of loan pairs results in the formation of pi bonds, which are unsaturated covalent sharing formed above or below the covalent bonds.

An example of pair with a single bond has been:

The examples of pairs with double bonds:

The examples of pairs with triple bonds:

Not every atom can form these bonds as there has been the presence of loan pairs with the atom for the formation of the double and triple bond.

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Answer:

Aluminium sulphate is an inorganic compound.

Answer:

Changing two or more variables makes it difficult to find a cause and effect relationship.

Carbon and oxygen atoms in (CH3)2C=O form sigma and pi bonds. The pi bonds are formed using unhybridized p orbitals.

Acetone (CH3)2C=O contains the carbonyl group (C=O). Carbon is bonded to oxygen via a double bond as shown in the orbital structure. The carbon atom is also bonded to two methyl groups.

The central carbon  atom is sp2 hybridized as well as the oxygen atom in acetone. The pi bond is formed by the overlap of unhybridized p orbitals on both carbon and oxygen atoms. The sigma bonds are formed using the sp2 hybridized carbon atoms on carbon and oxygen.

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Answer:

pour the rock salt mixture throught a filter made from paper and allow the liquid to filtrate .

Explanation:

Separating Sand and Salt

Probably the easiest method to separate the two substances is to dissolve salt in water, pour the liquid away from the sand, and then evaporate the water to recover the salt.

Pour the liquid through a paper filter made of rock salt mixture and let it filter, after complete filtration we obtain crystals of salt.

Filtration is defined as the technique of removing solid particles from a liquid or gaseous fluid by passing the fluid through a filter media while keeping the solid particles behind.

It can also be defined as a physical method that uses a filter media with a complicated structure that only allows fluid to pass through to separate solid matter and liquid from a combination.

There are six types of filtration.

Mixture is defined as a substance that is composed of two more chemical compounds or substances that do not chemically mix.

There are two types of mixture.

Thus, pour the liquid through a paper filter made of rock salt mixture and let it filter, after complete filtration we obtain crystals of salt.

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Taking into account the definition of dilution, the concentration of the final solution is 5 mg/L.

First of all, you have to know that dilution is the reduction in concentration of a chemical in a solution.  The process consists of adding more solvent to the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

25 mg/L × 10 mL= Cf × 50 mL

Solving:

Cf= (25 mg/L × 10 mL)÷ 50 mL

Cf=  5 mg/L

In summary, the concentration of the final solution is 5 mg/L.

Learn more about dilution:  

Answer:

B.

Explanation:

5 g of potassium oxalate react to produce 0.03 moles of calcium oxalate.

Calcium oxalate (CaC₂O₄) is obtained by the reaction of 5 g of potassium oxalate (K₂C₂O₄).

We can calculate the moles of CaC₂O₄ obtained considering the following relationships.

[tex]5 g K_2C_2O_4 \times \frac{1molK_2C_2O_4}{184.24gK_2C_2O_4} \times \frac{1molCaC_2O_4}{2molK_2C_2O_4} = 0.03molCaC_2O_4[/tex]

5 g of potassium oxalate react to produce 0.03 moles of calcium oxalate.

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Answer:

4.002602 u

Explanation

Answer:

4.002602 u

Explanation:

Answer:

density=20/8 g/cc=2.5 g/cc

Mercury is more dense, so aluminum will float on it. Water is less dense, so the aluminum will be below water.

Aluminum will float atop mercury because it is more dense than it. Due to water's lower density, the metal will lie below the surface.

Density is defined as the measure of how densely a material is packed together.

It can also be defined as the mass of a solid substance per unit volume.

Density is important because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion. As long as an object's density is lower than the liquid's density, it will often float.

The term "density" refers to the relationship between a substance's mass and the volume it takes up in space. The mass, size, and arrangement of an object's atoms influence its density.

Density can be expressed as

Density = mass / volume

There are two types of density.

Thus, aluminum will float atop mercury because it is more dense than it. Due to water's lower density, the metal will lie below the surface.

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Answer:

Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs.

Explanation:

https://www.nationalgeographic.org/encyclopedia/air-pollution/#:~:text=Air%20pollution%20can%20also%20cause%20headaches%2C%20dizziness%2C%20and%20nausea.&text=Long%2Dterm%20health%20effects%20from,%2C%20liver%2C%20and%20other%20organs.

I CANT DELETE THE ANSWER, SO HERE.

Answer: I'll leave the answer rounded to three sig figs.

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So, you can say that in a hydrogen atom, an electron located on  

n

i

=

2

that absorbs a photon of energy  

4.85

⋅

10

−

19

J

can make the jump to  

n

f

=

6

.

Explanation:

The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from  

n

i

=

2

to  

n

f

=

6

.

A good starting point here will be to calculate the energy of the photon emitted when the electron falls from  

n

i

=

6

to  

n

f

=

2

by using the Rydberg equation.

Answer:

A compound is a pure substance.