In order for a chemical reaction to take place, a certain amount of _____ must be present.

Answer:

140mm................

3.125g

Explanation

2.4 minutes = 1 half life

so 12 minutes = 5 half lives (12/2.4)

100g/2 = 50g (1 half life)

50g/2 = 25g (2 half lives)

25g/2 = 12.5g (3 half lives)

12.5g/2 = 6.25g (4 half lives)

6.25g/2 = 3.125g (5 half lives)

First, the amount of sunlight received at a given latitude is important. At the equator, the sun is high in the sky and thus very intense. As you move away from the equator, the sun does not reach as high of an angle in the sky, and is less intense. Another important effect near the poles is that during the summer, the sun is up all the time, which boosts the total amount of sunlight received in a day, while in contrast, during the winter, no sunlight is received at all.

There is another, more subtle effect that has to do with latitude. Nature likes to have the temperature be the same everywhere, much like ice cream melts at room temperature or a hot cup of coffee cools to room temperature. The equator is getting blasted with intense sunlight, while the poles are getting a lot less. Nature tries to resolve this imbalance and make the atmosphere the same temperature everywhere. The most efficient way to transfer heat towards the poles depends on latitude and the rotation of the Earth in a complex way. In the tropics (within 30 degrees latitude of the equator), the average daily temperature is mostly constant. Whether you move from north to south, say fro the equator to Mexico, the temperature is mostly the same. Compare that to the midlatitudes (30–60 degrees latitude), where the temperature changes rapidly as you move north or south to the poles. For example, the temperature in Texas is a lot hotter than the temperature in North Dakota.

Another factor is the composition of the surface. Different substances absorb, store, and re-emit heat with different levels of efficiency. The ocean is a major factor, which can either warm or cool the adjacent land. Other surface materials like rock, sand, vegetation, and ice also regulate temperature

The elevations of the surface, specifically mountains effect the climate. Usually, the taller the mountain, the colder the temperature is at the top. Mountains also cause air to flow in certain ways around them, which leads to wet areas on the upwind side and dry areas on the downwind side.

Answer:

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Explanation:

Answer: A volume of .5650 what? And what unit will be considered?

Answer:

compounds

Explanation:

Answer:

Here boron-11 means the name of the element is boron and the mass number is 11

Explanation:

Answer: 0.28 mol H2

Explanation:

0.57mol HCl         1mol H2          

                             2mol Hcl

Hydrochloric acid and zinc show the displacement reaction to produce hydrogen gas and zinc chloride. 0.57 moles of hydrochloric acid and excess zinc react to produce 0.28 mol H₂.

A displacement reaction is the removal of one of the elements from the reactant with highly active species of the reactivity species to produce the products. It can be a single or double displacement reaction.

The balanced chemical displacement reaction is given as:

2 HCl + Zn → H₂ + ZnCl₂

Here, two hydrochloric acids react with zinc to form one mole of hydrogen gas and one mole of zinc chloride.

Given,

Hydrochloric acid = 0.57 moles

Using proportions to calculate moles as:

If 2 moles of HCl = 1 mole H₂

Then, 0.57 moles = X moles

X = 0.57 ÷ 2

= 0.28 mol H₂

Therefore, 0.57 mole HCl produces 0.28 moles of hydrogen gas.

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Answer:

metallic bond, force that holds atoms together in a metallic substance. The atoms that the electrons leave behind become positive ions, and the interaction between such ions and valence electrons gives rise to the cohesive or binding force that holds the metallic crystal together.

Explanation:

The total pressure in the flask measured at 400 K is 1 atm

The correct answer to the question is Option B. 1 atm

From the question given above, the following data were obtained:

Using the ideal gas equation, we can obtain the pressure in the flask as follow:

PV = nRT

P × 1 = 0.03 × 0.082 × 400

Therefore, the total pressure in the flask measured at 400 K is 1 atm

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Answer: a: 3 atm

Explanation:

0.03 mol NH4NO3 decomposes into 0.09 mol of gas total, thus we multiply 0.09 by 0.082 and 400K to get our answer of about 3 atm.

Answer:

Triple bond is the strongest bond

Triple bonds are stronger than the equivalent single bonds or double bonds, with a bond order of three.

Answer:

In a single covalent bond, when the electrons are shared between two s orbitals, the resulting bond is a sigma (σ) bond . Sigma bonds are the strongest covalent chemical bonds....!!

Answer:

Molar volume at STP can be used to convert from moles to gas volume and from gas volume to moles. The equality of 1 mole = 22.4 L is the basis for the conversion factor.

Explanation:

Answer:

the 4 properties of waves are frequency, amplitude, wavelength, and speed.

Explanation:

Answer:

17550g

Explanation:

You want to use the equation D=M/V. You are given density in g/mL, so you just need to multiply that by 9L, but first you want the mL and L to match, so you change the 9L to 9000mL (knowing there is 1000mL in 1L). Then solve algebraically by multiplying the 9000mL and the 1.95g/ml, making the mL cancel, leaving you with your answer in grams.

Hope this helps!

Answer:

sodium atom

Explanation:

Answer:

The ecological relationship between termites and the wood-digesting protozoans that live in their gut is an example of  mutualism. Thank you for posting your question here at brainly. I hope the answer will help you.

Mg is ahead of Al in the electrochemical series and more reactive than Al hence Al does not react with MgCl2.

A chemical reaction is said to have occurred when new substances are formed. The reaction between magnesium chloride  solution and sodium carbonate solution is a double decomposition reaction since the cations exchange anion partners in the product;

MgCl2(aq) + Na2CO3(aq) ------> MgCO3(s) + 2NaCl(aq)

We must note that a single replacement reaction depends on the relative positions of metals in the electrochemical series. Al can react with CuCl2 because Al is more reactive than copper and ahead of Cu in the electrochemical series. On the other hand, Mg is ahead of Al in the electrochemical series and more reactive than Al hence Al does not react with MgCl2.

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Answer:

because...it is not strong enough proton donor to be entirely converted to hydronium ions in aqueous solution...

Explanation:

lemme know whether that was helpful!

Answer:

OCNCl

Explanation:

The empirical formula for trichloroisocyanuric acid, the active ingredient in many household bleaches, is OCNCl. The molar mass of this compound is 232.41g/mol.

Answer:

nonmetal

Explanation:

.........

...

.

Answer:

0.147

Explanation:

Moles equals mass over AR/MR so 1.662 over 11 gives 0.147

Answer:

The electron microscope is the answer.

Answer:

a compound

Explanation:

Answer:

a. NP

b. NP

c. Polar

d. Ionic

e. Polar

Explanation:

The way I did it was using the electronegativity of the elements mentioned and subtracted the pairs. For non polar the difference is 0-0.4, for polar it’s 0.4-2.0, for ionic it’s >2.0. I included the chart I used to find the electonegativity for the elements below.

B: 2.04, P: 2.19, difference is 0.15, so NP

Be: 1.57, Si: 1.9, difference is 0.33, so NP

C: 2.55, Na: 0.93, difference is 1.62, so Polar

Li: 0.98, O: 3.44, difference is 2.46, so Ionic

Mg: 1.31, N: 3.04, difference is 1.73, so Polar

If you really want I can explain why electronegativity affects the types of bonds, just comment below

Answer:

Polar is the correct answer

Explanation:

#CarryOnLearning

Answer:

It’s because of the green substance on the copper square, pennies and the Statue of Liberty giving those objects the ability to all be soluble in water.

Answer:

it would ether be gray to black or silver to gray and black

Explanation:

because of my calculation ekasillicon would be that color because of the eyes and because of your color seeing .

Answer:

There are four natural states of matter: Solids, liquids, gases and plasma. ... Solids have a definite shape, as well as mass and volume, and do not conform to the shape of the container in which they are placed. Solids also have a high density, meaning that the particles are tightly packed together.

Explanation:

hope this helps! goodluck & enjoy the rest of ur day or night.

The bond angle obtained based on the geometry of the molecule alone is known as the predicted bond angle.

When a compound is formed, the less electronegative atom in the compound is called the central atom in the molecule. The angle formed by the nuclei of two surrounding atoms with the nucleus of the central atom in a structure is called a bond angle.

The bond angle is usually based on the geometry of the molecule. The expected geometry can be deviated for certain reasons such as the presence of lone pairs on the central atom in the molecule. The bond angle obtained based on the geometry of the molecule alone is known as the predicted bond angle.

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