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Answer:

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

Explanation:

Answer:

95F

Explanation:

First we convert these temperatures into °C:

77°F = 25°C

95°F = 35°C

280K = 6.85°C

300K = 26.85°C

When temperature increases, water molecules have a greater average kinetic energy ans are more likely to collide with each other.

Out of the 4 temperatures, only 95°F (35°C) is of a higher temperature than 30°C. Hence 95°F is the answer.

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:

see below

Explanation:

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

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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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:

C

Explanation:

Increasing temp causes increased molecule movment in sample 2

Explanation:

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

Answer: It’s B

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:

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:

What are those for solution be specific

Answer:

B

Explanation:

Uranium is windly use to reactant.

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

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:

False

Explanation:

Answer:

because the ions arent firmly held in place!

Explanation:

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.

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

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

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:

The calculated volume of the gas (in mL) at 20.0c and 740.mmHg when volume of gas collected at temperature of  11.0° C and pressure of 710 mmHg measures 0.148L is 78. 1 mL

Explanation:

The combined gas law combines the three gas laws, Boyle's law, Charles's law and Gay- Lussac's law. It states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.

P V ÷ T = K

P1 × V1 ÷ T1 = P2× V2 ÷ T2

Parameters :

P1 = Initial pressure = 710.0 mmHg

V1 = 0. 148 L , converting it to mL = 0.148L × 1000 = 148 mL

T1 = Initial temperature = 11° C

P2 = Final pressure = 740 mmHg

V2 = Final volume in mL

T2 = Final temperature = 20° C

Calculations:

V2 = P1 × V1 × T2 ÷ P2 × T1

V2 = 710 × 148 × 11 ÷ 740 × 20

V2 = 1155880 ÷ 14800

V2 = 78.1 mL

Therefore, the calculated volume is 78.1 mL

Answer:

chemical reaction

Explanation:

Reduction is the transfer of electrons between species in a chemical reaction where there is a process of gaining electrons or a decrease in the oxidation state by an element. A reduction chemical reaction involves increasing electrons associated with a single atom or a group of atom

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:

7.2e+6 cm (7200000cm)

Explanation:

Hope this is the answer your looking for ;)

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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Answer:

The answer is C.

Explanation:

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

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