___ ___ ___ ___ ___ P ___ ___ ___ ___ ___ ___ ___ mediums allow light to pass through

Answer:

24

Explanation:

26-2=24 because when an atoms loses 2 electrons it gains 2+ charge

Answer:

Explanation: Don't let anyone bring you down you got this you matter, and rock!

Answer:

Well for me I think

Explanation:

it's Aliminium

Answer:

Aluminum is good in heat and conductor

Answer:

Argon

Explanation:

I'm pretty sure it's argon.

Answer:

c) 1610 s

d) 0.0890 m

Explanation:

Significant figures:

The given measurement have four significant figures 1234.

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.

Zero between the non zero digits are consider significant like 104 consist of three significant figures.

The zeros at the right side when decimal point is present e.g 2400. are also significant. There are four significant figures are present.

a) 0.003 L

This measurement have 1 significant figure which is 3.

b) 140 g

This measurement have 3 significant figure  1, 4. In this measurement 0 is trailing zero that's why it is not consider significant.

c) 1610 s

This measurement have 3 significant figures 1, 6, 1.

d) 0.0890 m

This measurement have 3 significant figures 8,9 and 0

Answer:

I do K12 and c is correct!

Answer: B. ridge push and slab pull

Explanation: Took the test.

Additional information

Relative atomic mass(Ar) : A=7, G=16

The empirical formula : A₂G

Given

3.5g of element A

4.0g of element G

Required

the empirical formula for this compound

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.

The empirical formula also shows the simplest mole ratio of the constituent elements of the compound

mol of element A :

[tex]\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{3.5}{7}=0.5[/tex]

mol of element G :

[tex]\tt mol=\dfrac{4}{16}=0.25[/tex]

mol ratio A : G = 0.5 : 0.25 = 2 : 1

Vanadium (V)

Vanadium is the only one in the 4th period here so

Answer:  7.00 L

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

[tex]P\propto \frac{1}{V}[/tex]     (At constant temperature and number of moles)

[tex]P_1V_1=P_2V_2[/tex]  

where,

[tex]P_1[/tex] = initial pressure of gas  = 42.0 mm Hg

[tex]P_2[/tex] = final pressure of gas  = 75.0 mm Hg

[tex]V_1[/tex] = initial volume of gas   = 12.5 L

[tex]V_2[/tex] = final volume of gas  = ?

[tex]42.0\times 12.5=75.0\times V_2[/tex]  

[tex]V_2=7.00L[/tex]

Therefore, the volume  when the pressure has increased to 75.0 mm Hg is 7.00 L

Answer:

A gaping hole in the ozone layer over Antarctica was discovered in the mid 1980s. The international community agreed the Montreal Protocol in 1987, which banned most of the offending chemicals.

Answer:

Soap breaks up the oil into smaller drops, which can mix with the water.

Explanation:

This works because soap is made up of molecules with two different ends.

The soap molecules works as a surfactant for the water oil interphase. The hydrophobic head of the soap molecules trap the oil and dirt ad remove from the surface.

Surfactants are chemical substances used to reduce the interfacial tension between substance boundary. Soaps and detergents acts as surfactants which are used to remove the dirt and oil from material surface.

Soap has both polar and non-polar characteristics. The alkaline part  in the soap causes it to have a polar head, and because of the electric charge on this head, the soap is hydrophilic. A hydrophilic part of soap is drawn to water and will cling to it.

In this instance, the positive-charged hydrogen atoms of the water's hydrogen atoms match with the polar head of the soap molecule. The other part of soap is a fatty acid tail, which is hydrophobic and can bind with the oil and dirt. The trapped oil molecules are then be removed by water.

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Answer:

H20 is a compound so it's the answer

Explanation:

Have a good day

Answer:

d

Explanation:

Answer:

✔ semiarid

✔ desert

✔ semiarid

✔ steppes

.

Explanation:

The deserts and steppes comprise the regions that are characterized by dry climates. The dry climates are characterized by very little rainfall, hot summers, and mild winters. The correct option is B.

The areas which are very dry and where the water escapes and leaves the area drier than other places is known as the dry climate. Most dry climates have summers very hot, winters cool and warm and the air is very dry.

The main characteristic feature of the dry climate is the low and infrequent rainfall. Arid and semi desert areas have only about 35 cm rainfall per year.

Thus the correct option is B.

To know more about dry climate, visit;

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Answer:

Chemical change

Explanation:

Because it will be 2 mixtures of each substances making it 1 substance, and 1 change.

Answer:

238g

Explanation:

Molar Mass (1 mol) of H2O2 = 34.0147 g/mol

7.00 mol = 35.0147*7

= 238.1029g

= 238g (rounded to 3 sig figs because 3 sig figs in 7,00)

Answer:

answer in picture

Explanation:

Explanation:

They are both in shell 5 and subshell s.

Since s only has 1 orbital, they also have the same orbital number.

But they have different magnetic spins.

Hence 3 out of 4 quantum numbers are in common.

Answer:

The Outer-most Electron shell contains the valence electrons.

Bonus Info:

Valence Electrons are used by atoms to make ionic bonds.

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.

Explanation:

ur welcome

i was doing this in school and i watched a video

Answer:

19.K, potassium

Explanation:

it has all properties of metals

Answer:

Chemical

Explanation:

Answer:

SeCl6 + O2——> seO2 + 3Cl2

Answer:

See explanation

Explanation:

Since iron is a metal and oxygen is a non metal, a bond is formed between the two when electrons are transferred from iron to oxygen. Hence the bond is ionic.

Two silver atoms are held together by metallic bonds. Metallic bond are bond forces that exist between metal atoms in a crystal lattice. The valence electrons in this bond form a cloud. Metals have low ionization energy and low electronegativity hence they loose electrons easily. This accounts for the nature of the metallic bond.

The bond formed between two chlorine atoms is a covalent bond. The valence electrons in this bond are localized between the two chlorine atoms. Chlorine is a nonmetal hence it has a high ionization energy and high electronegativity. Hence it forms covalent bonds in which electrons are shared between bonding atoms.

Answer:

Lowering activation energy of a reaction.

Explanation:

Activation energy is the minimum amount of energy required by the reactants just to be converted to products.

Since catalysts increase the rate of reaction, activation complex is reached in short period of time hence activation energy is lowered.

Answer:

Hurricanes are the most violent storms on Earth. They form near the equator over warm ocean waters. Actually, the term hurricane is used only for the large storms that form over the Atlantic Ocean or eastern Pacific Ocean. The generic, scientific term for these storms, wherever they occur, is tropical cyclone.

im going to guess the answer is A, sorry if im wrong.

hope this helps.

Answer:

not sure about it .I also need an answer

Answer:

really?!?! well did u know oranges can get stale??

Answer:

A control group is someone who takes control over something so a tyrant or a dictator.

Explanation:

If this isnt what your looking for let me know, there wasnt alot of context.

Answer: a group that helps you control something

Explanation: like a surport group but for addictions maybe

Answer:

Reaction is a Combustion reaction

Answer:

carbon

Explanation:

i just googled it

Answer:

Are barium and chlorine a metal and nonmetal?

Explanation:

I had the same question, and my class reviewed the test and this was the answer to this question.