please help

Tare the balance. Place the wooden block on
the pan, and record the block's mass below. g

Answer:

see below

Explanation:

water  pH ~ 7     acids are less than 7                bases are > 7

Answer:

The solvent would wash away the dye.

Explanation:

The solution will m ove to the top and you would not be able to calculate the Rf value that is com pared to the distance that a com ponent traveled in the stationary phase reached by the solvent.

Answer:

The solvent would wash away the dye.

Explanation:

The solution will m ove to the top and you would not be able to calculate the Rf value that is com pared to the distance that a com ponent traveled in the stationary phase reached by the solvent.

Network solids are chemical compounds that are bound together by a covalent bond. Thus, option D is accurate.

Covalent bonds are the type of chemical bonds that mutually shares electrons between the atoms of the molecules of the compound.

A covalent crystal of network solids is held together by the covalent bond that can be seen in the structures of diamonds, graphite, silicon dioxide, etc.

Therefore, the network solids are option D. held by the covalent bonds.

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In the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.

An atomic model is a graphic representation and/or diagram used to identify the components of atoms.

An atomic model may have into account all its components (i.e., electrons, protons, and neutrons).

In conclusion, in the model of the atom, a fuzzy cloud around a hydrogen nucleus is used to represent the general region where the atom's electron is most likely located.

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Answer:

because the ions arent firmly held in place!

Explanation:

Sulfuric acid can dissociate into hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−).

Sulfuric acid is a very strong acid which ionizes into hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−) while on the other hand, in dilute solutions the hydrogen sulfate ions also dissociate, forming more hydronium ions and sulfate ions (SO42−).

So we can conclude that Sulfuric acid can dissociate into hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−).

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Answer: New Hampshire

Explanation:

If it is the dark green then its New Hampshire :)

Answer:

New Hampshire ;)

Explanation:

New Hampshire is the dark green state on this map, and it is apart of the first 13 colony I hope that helped.

The type of reaction that occurs between  calcium hydroxide and nitric acid is a neutralization reaction.

The term neutralization reaction refers to a reaction that occurs between an acid and a base that leas to the formation of salt and water only. The type of reaction that occurs between  calcium hydroxide and nitric acid is a neutralization reaction.

The reason why zinc will react with lead nitrate and not calcium chloride is because lead is less than zinc in the electrochemical series hence it can be displaced from solution.

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Answer:

7.2e+6 cm (7200000cm)

Explanation:

Hope this is the answer your looking for ;)

Answer:

The molar mass of calcium hydroxide,

Ca(OH)2, is 74.092 g/mol.

Explanation:

The molar mass of a compound is determined by multiplying the subscript of each element in the formula by its molar mass (atomic weight on the periodic table) in g/mol, and adding the results.

The formula for calcium hydroxide is: Ca(OH)2

Molar Mass Ca(OH)2:

(1×40.078g/mol Ca)+(2×15.999g/mol O)+(2×1.008g/mol H)

=74.092 g/mol Ca(OH)2

Answer:

74.093 g/mol

Explanation:

Add the mass of Ca (found on the periodic table), the mass of 2 oxygens and 2 hydrogens together.

40.078+2(15.999)+2(1.00784)=74.093

At a pressure of 200 atm, water’s melting point is approximately 0⁰C and its boiling point is approximately 370⁰C.

Melting point is the temperature at which a substance changes into liquid form.

From the chart, at a pressure of 200 atm, water’s melting point is approximately 0⁰C.

This is the temperature at which a liquid turns into a vapor. It is the temperature at which liquid and vapor co-exist.

From the chart, at a pressure of 200 atm, water’s boiling point is approximately 370⁰C.

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Answer:

If I remember correctly it should be B because it went from Cu^2 to Cu^0

Explanation:

Now

[tex]\\ \rm\Rrightarrow Q=mc\delta T[/tex]

[tex]\\ \rm\Rrightarrow Q=200(10)(0.21)[/tex]

[tex]\\ \rm\Rrightarrow Q=20(21)[/tex]

[tex]\\ \rm\Rrightarrow Q=420cal[/tex]

Answer:

AAAAA its A

Explanation:

Identify the molecular shape of each lewis structure we have that:

1. Trigonal pyramidal

2. Tetrahedral

3. Trigonal planar

4. Bent

For an understanding through pictures of the location of electrons in an atom, we represent electrons as dots around the element symbol. The number of electrons available for bonding is indicated by unpaired dots. These symbols are called Lewis symbols.

The Lewis structure shows the formation of bonds in a molecule, as well as the atoms involved and the valence electrons of each of them, in this case was Trigonal pyramidal; Tetrahedral; Trigonal planar; Bent.

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Answer:

B

Explanation:

Uranium is windly use to reactant.

fringing reef..........

Answer:

Glycerine, water and methylated spirits have hydrogen bonds between the molecules. However, in water and Glycerine these intermolecular forces are very strong while in the methylated spirits they are slightly weaker. This leads to the higher boiling point for water and Glycerine.

Explanation:

In chemistry a molecular formula indicates every single atom and its numbers in a chemical compound. Hence the molecular formula C3H8O3 simply says that there are three carbon (C) atoms, eight hydrogen (H) atoms and three oxygen (O) atoms in this compound.

Answer:

Explanation:

Answer: 1.380 × 10^-8 M

The pH is the measure of alkalinity or acidity of a substance.

It is the negative logarithm of H+ ions concentration [H+].

pH = -log[H+]

pOH on the other hand is negative logarith of OH- concentration [OH-].

pOH = -log[OH-]

In this case;

pOH = 7.86

We can calculate the [OH-]

pOH = -log[OH-]

But, pOH = 7.86

pOH = -log[OH-]

-log[OH-] = 7.86

[OH-] = Antilog -7.86

      = 1.380 × 10^-8 M

Therefore, [OH-] is 1.380 × 10^-8 M

Answer:

What are those for solution be specific

Energy is the fundamental need for lives. Fossil fuel is the energy source that is most needed in society. It is now replaced with solar energy as fossil fuels are nonrenewable resources.

Nonrenewable resources are energy sources that are finite in amount and get depleted after some time as it takes millions of years to produce these resources. Fossil fuels though are needed but are nonrenewable and cause pollution.

Solar energy is a renewable source that is present in abundant and infinite quantity and does not get depleted fast after they are used excessively. They are also environmentally friendly and do not produces much pollution.

Therefore, fossil fuel and solar energy are the most demanded sources.

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Answer:

C

Explanation:

Increasing temp causes increased molecule movment in sample 2

Explanation:

150 grams is .15 liters

1 mole of gas at STP occupies 22.414 liters

.15 liter of hydrogen represents .15/22.414 =

0.0066922 moles of H2

equation is

Zn + 2HCl → ZnCl2 + H2

1 mole of Zn will make 1 mole of H2

0.0066922 moles of Zn will make 0.0066922 moles of H2

To convert this molar quantity of zinc into grams we simply multiply by the atomic mass of zinc, which is

65.38 g/mol;-

Mass of Zn required = 0.0066922 moles * 65.38 g/mol = 0.4375390381 grams

https://www.quora.com/How-many-grams-of-Zinc-would-you-need-to-react-with-Hydrochloric-acid-to-produce-1-L-of-H2-gas

Explanation:

Evolution is a biological process. It is how living things change over time and how new species develop.

Answer: It’s B

Explanation:

Answer:

Explanation:

Use context clues to write your own definition for each meaning of the word matter.

Example sentence

What is this gooey matter on the table?

Matter:

__________

Example sentence

Please vote! Your opinions matter.

Matter:

__________

Answer:

It is harmful gas which cause global warming

Answer:

Point A

Explanation:

The Northern Hemisphere is furthest away from the sun in position A. Therefore the sunlight takes longer to reach the Earth which results in the Northern Hemisphere experiencing winter.

Point A represents the position where the northern hemisphere is experiencing winter.

This is because Earth's axis is tilted away from the sun at this point, causing the northern hemisphere to receive less direct sunlight and shorter days. As a result, the rays from the sun are spread over a larger area, making the sunlight less intense and leading to colder temperatures during this time of the year in the northern hemisphere.

In contrast, at Point C, the northern hemisphere experiences summer. This is when the Earth's axis is tilted towards the sun, causing the northern hemisphere to receive more direct sunlight and longer days, resulting in warmer temperatures.

Points B and D are the equinox positions when the sun shines evenly on Earth from pole to pole, and both hemispheres experience approximately equal day and night lengths. These are the times of the year when transitions between seasons occur.

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Answer:

The answer is C.

Explanation:

Oxygen- This is also an important cause of chemical weathering.

Answer:

False

Explanation: