PLEASE HELP!! 30 PTS


Identify the combination reaction.


1.) 2H 2 + O 2 ⟶ 2H 2O

2.) Cl 2 + 2KBr ⟶ 2KCl + Br 2

3.) Al 2S 3 ⟶ 2Al + 3S

4.) C 4H 12 + 7O 2 ⟶ 6H 2O + 4CO 2

it is D. Air pressure!!! :)

Answer: I can’t explain how it impacts ionic bonding but I can tell you what ionization energy is.

Explanation:

ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.

Answer:

0.00420

Explanation:

The equation is Q=mc(T(final)-T(initial), where c is the specific heat, Q is heat supplied, m is mass, T(final) is final temperature and T(initial) is initial temperature (you'll see this written as delta T, which means change in temperature).

2520 = Q

m = 10.0kg; answer choices are in g, not kg, so multiply by 1000 to get m in g; m = 10000 g

Plug in the values you have and solve for c.

2520=(10000)(c)(70-10)

2520=600000c

c=0.0042 j/(gc)

Answer:

4.2 j/kg-C      =  .0042 j / (g-C)

Explanation:

Specific heat units are    j / kg-C

   2520 J  / [ (10 kg)(70-10 C)]   = 4.2   j / kg-C

Explanation:

When working with moles only, you will start by applying stoichiometry to determine how the reactants will affect your amount of products in this reaction. For this question, we will assume that other reactants are in infinite qualities, so therefore, it is the amount of aluminum that we will be concerned with. You need to figure out how much aluminum is in the specified amount of aluminum bromide, and then how much aluminum hydroxide that will be able to create. Make sure all your units cancel out!

9.24 mol AlBr3 x (1 mol Al / 1 mol AlBr3) x (1 mol Al(OH)3 / 1 mol Al) = 9.24 mol AlBr3

When you're working with mole ratios that involve grams to moles conversions, the first thing you want to do is calculate the molecular weight of each component you are being asked about. Because the question was given to you as words instead of chemical formulas, you will want to figure out the chemical formulas. For example, aluminum hydroxide is Al(OH)3 and aluminum bromide is AlBr3. To calculate molecular weight, you will want to consult a periodic table, find the molecular weight for each atom, and then calculate the correct sum of each molecular weight. Make sure you keep track of the number of each atom you have, i.e. 3 oxygen and 3 hydrogen for aluminum hydroxide.

Na = 22.990 g/mol

O = 15.999 g/mol

H = 1.008 g/mol

NaOH = 22.990 g/mol + 15.999 g/mol + 1.008 g/mol = 39.997 g/mol

Al = 26.982 g/mol

O = 15.999 g/mol

H = 1.008 g/mol

Al(OH)3 = 26.982 g/mol + (3 x 15.999 g/mol) + (3 x 1.008 g/mol) = 78.003 g/mol

Now, if you begin with an amount of NaOH in grams, you will first have to convert that to moles in order to use the mole ratio.

24 g NaOH x (1 mol NaOH / 39.997 g NaOH) = 0.600 mol NaOH

Now, you will have to account for the part of the sodium hydroxide that will be present in the aluminum hydroxide. In this case, it is the hydroxide (OH) portion of the formula. There is one mole of OH in each mole of NaOH, but there are 3 moles of OH in each mole of Al(OH)3. You will start with the 0.600 mol NaOH you know you have and then use the mole ratio.

0.600 mol NaOH x (1 mol OH / 1 mol NaOH) x (1 mol Al(OH)3 / 3 mol OH) = 0.200 mol Al(OH)3

Finally, when you are converting from grams to grams, you will have to find the molecular weight of both the reactant and the product, convert reactants in grams to reactants in moles, then use the mole ratio, then convert the moles of product back to grams of product. This time, you are concerned about the mole ratio of sodium, as that is the element that is in both chemical formulas.

Answer:

30 moles

Explanation:

From the equation it is a one - to - one reaction

The result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595. Details about multiplication can be found below.

Multiplication is the process of computing the sum of a number with itself a specified number of times, or any other analogous binary operation that combines other mathematical objects.

Multiplication as an operation increases a number.

According to this question, the following expression is given: 0.0030 x 8.65 = 0.02595

Therefore, the result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595.

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Answer:

A Lunar eclipse

Explanation:

A Lunar eclipse occurs only when the sun,earth and moon are exactly aligned with earth .

This can be viewed twice in calendar years.

It's a Lunar Eclipse.

A lunar eclipse is the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon. A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.

Convert

Apply Charles law

Answer:

See below ~

Explanation:

Q1

Given :

Unknown :

Formula :

Solution :

Final Answer :

Q2

Given :

Unknown :

Formula :

Solution :

Final Answer :

Answer:

42 millions of single cells

Answer:

network

Explanation:

ionic is strongest

chegg

A network is the type of solid that has the weakest forces holding it together.

A network, in computing, is a group of two or extra gadgets or nodes that could talk. The gadgets or nodes in question can be connected through physical or wi-fi connections. The key is that there are at least separate components, and they may be connected.

A home wireless LAN (wireless local area network, or Wi-Fi network) is a good example of a small client-server network. Various devices in the home are wirelessly connected to a router that acts as the central node (server) in the home.

A network is a collection of computers, servers, mainframes, community gadgets, peripherals, or other devices related to permitting facts sharing. An example of a network is the net, which connects hundreds of thousands of people everywhere in the global.

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Answer:

= 0.4 M

Explanation:

data:

moles = 0.060 moles

volume = 1500 ml

             = 1500 / 1000

              = 1.5 dm^3

solution;

      molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]

                    = 0.060 / 1.5

         molarity  = 0.4 M

The mass of copper that will be produced from copper oxide is determined as 3.19 g.

The mass of copper that will be produced from copper oxide is calculated as follows;

2Cu + O₂  -----> 2CuO

2          1             2

2(63.5) ------------ 2(79.5)

x ---------------------- 4 g

x = (4 x 2 x 63.5)/(2 x 79.5)

x = 3.19 g

Thus, the mass of copper that will be produced from copper oxide is determined as 3.19 g.

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Because:

Their roots are no longer in the soil. Thus, can't absorb water and mineral ions needed for plant growth via photosynthesis.

Hope this helps!

Answer:

Yes

Explanation:

Well this is because when a plant is planted water goes from the soil, into the roots then finally distributed to other parts of the plant.

So when plants have been plucked or uprooted water no longer has access to the plant which may result to the plant being dried up and will possibly die

The pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.

What is atmospheric pressure?

The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.

Atmospheric pressure = 101.325 kPa

Vapor pressure of water at 22°C = 2.6427 kPa

Pressure of N₂ = (Atmospheric pressure) - (vapour pressure of water at 22°C)

Pressure of N₂ = (101.325 kPa) - ( 2.6427 kPa)

Pressure of N₂ = 98.6823 kPa

Therefore, the pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.

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Answer:

an increase in temperature

Explanation:

The chemical reaction that is produced by modelage masks causes: an increase in temperature

Answer:

0.0734 grams LiOH

Explanation:

The molarity formula looks like this:

Molarity (M) = moles / volume (L)

You are given the molarity and volume (in mL). Therefore, you can plug these values into the equation and solve for moles (after you convert from mL to L).

25 mL / 1,000 = 0.025 L

0.125 M = moles / 0.025 L

(0.125 M) x (0.025 L) = moles

0.003125 = moles

After using the molarity formula, we know that 0.003125 moles LiOH are needed to satisfy these conditions. Now, we can convert this to grams using the molar mass of LiOH. This can be determined using the values from the periodic table. Remember to write your conversion in a way that allows for the units to cancel out.

Molar Mass (LiOH) = 6.941 g/mol + 16.00 g/mol + 1.008 g/mol

Molar Mass (LiOH) = 23.499 g/mol

0.003125 moles           23.499 g
------------------------   x   -------------------  =  0.0734 grams LiOH
                                        1 mole

0.074 grams of lithium hydroxide are needed to make 25 ml of 0.125 M solution, according to the concept of molar concentration.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Here , in the problem mass is to be determined, hence the formula used is the first one mentioned.

Substituting values in the formula,mass=molar concentration×molar mass×volume in liters

∴0.125×23.95×0.025=0.074 g.

Hence, 0.074 g of lithium hydroxide are required to prepare 25 ml of 0.125 M solution.

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The hydrogen ion concentration is  [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .

The pH scale is used to rank solutions in terms of how acidic or how basic they are.

It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.

These ion concentrations are equal in pure water, which has a pH of 7.

The hydrogen ion and hydroxide ion are related as

[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[OH^{-}] }[/tex]

[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[5.42\times10^{-5} ] }[/tex]

[tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M

The hydrogen ion concentration is  [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .

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Answer:

100 degree is the answer of given statement

Answer:

0.50 Molar or 0.50 Mol/L

Explanation:

Molarity = [tex]\frac{Moles of Solute}{Litres of solution}[/tex]

Molarity = n / V

Given: Volume of solution(V): 1.75 Litres

Moles of solute(n): 0.877

Substituting values,

Solution:

Molarity = [tex]\frac{0.877}{1.75}[/tex]

Molarity = 0.50 Molar (rounded off to the nearest decimal place)

∴ Molarity = 0.50 Molar/ 0.50 Mol/L

Answer:

Discrepant events — demonstrations that produce unexpected outcomes — are used in science to capture students' attention and to confront their beliefs about a “phenomenon by producing an outcome which is contrary to what their previous experiences would lead them to believe is true” (Misiti, 2000, p.

Answer:

2350kg of Al₂O₃

Explanation:

Step 1 : Write the balanced chemical equation:

4Al + 3O₂ → 2Al₂O₃

Step 2: Find the Ratio of Al : Al₂O₃

Al : Al₂O₃

4 :  2

2 : 1

4700: 2350

= 2350kg of Al₂O₃

The river will deposit sediment along the inside of a bend in the river. This deposition causes the inside of the curve to become shallower and move farther inward.

Rivers flowing over gently sloping ground begin to curve back and forth across the landscape. These are called meandering rivers.

Meandering rivers erode sediment Larry from the outer curve of each meander bend and deposit it on an inner curve further down stream.

This causes individual meanders to grow larger and larger over time.

Meandering river channels are asymmetrical. The deepest part of the channel is on the outside of each bend. The water flows faster in these deeper sections and erodes material from the river bank.

The water flows more slowly in the shallow areas near the inside of each bend. The slower water can't carry as much sediment and deposits its load on a series of point bars.

Thus  the settling of sediment will make the stream steeper.

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Answer:

The river will deposit sediment along the inside of a bend in the river. The deposition causes the inside of the curve to become shallower and move farther inward.

Explanation:

Edmentum

Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy is False.

This is the type of matter change which is characterized by a liquid turning into a solid.

The particles lose energy and the molecules move closer to each other which is why False was chosen.

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Answer:

D Biomass produces no radioactive waste

Explanation:

Answer:

158 mL

158 mL of 0.1 M of HCl is required to react completely with 1 g mixture of Na2CO3 and NaHCO3, containing equimolar amounts of both

Explanation:

hope helpez -,-~

btw masoom bachi copied me~

Answer:

E.

Explanation:

Look at change in concentration over time...is it increasing or decreasing? It is increasing right as you can see because it starts at 0 then increases and plataeus. What increases in a reaction, reactant or product? Products increase right cuz your reactants react with each other to make prodcuts.

At start of reaction you have no products (zero) thus this graph starts at 0. At end you have alot of product thus over time the concentration of product increases.

ABC are reactants their concentration should decrease over time

DE are products, they should increase as reaction goes on.

Answer:

Neutrons play no role in the net charge of an atom, so you can ignore them here.

Proton = 7

Electron = 10

Net Charge = 7 - 10

= -3

Again,

Proton = 3

Electron = 2

Net Charge = 3 - 2

= 1

Answer:

Carbon has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons.