What is the group number and period number for Selenium?
group 7A, period 4
group 6A, period 4
group 6a. period 3
group 4a, period 6

Answer:

A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass.

Explanation:

Answer:

128gCaCl2 per 200gH2O

Explanation:

I might be wrong rlly srry if I am:/ Hope this helps doe have a wonderful day

Answer:

Circum-Pacific Belt/Pacific Plate

Explanation:

According to National Geographic, the Ring of Fire is also known as the Circum-Pacific Belt, the Ring of Fire traces the meeting points of many tectonic plates, including the Eurasian, North American, Juan de Fuca, Cocos, Caribbean, Nazca, Antarctic, Indian, Australian, Philippine, and other smaller plates, which all encircle the large Pacific Plate.

The name of the tectonic plate that the ring of fire encircles is pacific plate.

Plate tectonics is the generally accepted scientific theory that considers the Earth's lithosphere to comprise a number of large tectonic plates which have been slowly moving since about 3.4 billion years ago.The model builds on the concept of continental drift, an idea developed during the first decades of the 20th century. Plate tectonics came to be generally accepted by geoscientists after seafloor spreading was validated in the mid to late 1960s.

Earth's lithosphere, which is the rigid outermost shell of the planet (the crust and upper mantle), is broken into seven or eight major plates )and many minor plates or "platelets". Where the plates meet, their relative motion determines the type of plate boundary: convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries .

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There are different sources of fibres which can be genetically engineered for living organisms like the spider.

The fibre silk gotten from spiders are known to be the strongest, toughest materials on the Earth. But recently, engineers has designed amyloid silk hybrid proteins and produced them in engineered bacteria.

Even though these synthetically produced fibres are stronger than Kevlar, they prefer to use Kevlar because a much larger amount of silk might be needed to produce the same effect.

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Answer:

1.Arrangement of atoms in molecules

2.The cost might be higher for producing spiderweb silk

3.Different silk strands have different combinations of amino acids

4.Major ampullate

5.Goat milk

Answer:

Nylon Clothes. When the clothes made up of nylon are rubbed against some other fabric or against the wearer's skin, static electricity is formed.

Explanation:

Hope this helps

Answer:

when you rub a balloon on your hair and it stands up

Explanation:

Answer:

The solvent is deionised water

The solute is AgNO3

The solution is [Ag(aq) + NO3(aq)-]

Explanation:

Answer:

Explanation: If the water vapor content stays the same and the temperature drops, the relative humidity increases. If the water vapor content stays the same and the temperature rises, the relative humidity decreases. This is because colder air doesn't require as much moisture to become saturated as warmer air.

Answer:

Chemical changes cannot be reversed, their molecules are bonded together. Most Physical changes can be reversed, and their molecules are not bonded

Explanation:

Answer:

d. major ampullate

Answer:

c

Explanation:

The percent yield or percent recovery after recrystallization of the sample is 46.67%

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

In the given example,percent yield or percent recovery is calculated as,

percent yield=recovered yield/recrystallized yield×100

=0.98/2.1×100=46.67%

Hence, the percent  yield or recovery is 46.67%.

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Answer:

B. Carbon dioxide makes up a small part of the atmosphere of earth

Explanation:

When you look at the air that you breathe, you will say, that you breathe Oxygen, but actually, you breathe 71% nitrogen, then 28% oxygen, then 1% of many different gases like Argon, and Carbon Dioxide. That 1% is very less compared to 100%, so that's why, hence, your answer is that carbon dioxide makes up a small part of the atmosphere of Earth.

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MiniMeteorologist

primary producers: Phytoplankton

Primary consumers: Zooplankton

secondary consumers: Small fishes

Tertiary consumers: Large fishes

An ecological Pyramid is a graphical representation of the feeding relationship that exists between group of organisms in an ecosystem.

Inverted pyramids occurs in the aquatic ecosystem where

the biomass or organic matter of the fishes exceeds that is the primary producers.

The primary producer are the phytoplankton with the lowest organic matter if 100kg weight.

The primary consumers are the zooplankton with organic matter of 150kg in weight.

The secondary consumers are the small fishes with the organic matter that weighs 200kg.

The tertiary consumers are the large fishes with the organic matter that weighs 250kg.

The mass of organic matter represents the mass of living things in a particular trophic level. This is illustrated further in the attached diagram.

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The number of water molecules that would be produced will be 6.

According to this law, matter/mass is conserved in reactions. In other words, matters/mass is not lost but can be converted from one form to another.

In this case, the balanced equation that shows the law of conservation will be:

         6H2 + 3O2 → 6H2O

The number of H2 and O2 in the reactant and product sides is balanced

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Answer:1-6

2-12 oxygen atoms

3- reactant binds break and atoms rearrange to form new product combinations

4-2

5- no, it does not because the number and mass of atoms are conserved even though the number of molecules is not

Explanation:

just took it

Answer:

Standard boiling point

Explanation:

Note that there are 2 major units of pressure except Pa .

At 1 atm pressure the boiling temperature is called normal boiling point.

At 1 bar pressure the boiling temperature is called standard boiling point

Answer: Hope that helps!

Explanation: Researchers at NASA and the Department of Energy recently tested key technologies for developing a nuclear fission reactor that could power a human outpost on the moon or Mars. The tests prove that the agencies could build a “safe, reliable, and efficient” system by 2020, the year NASA plans to return humans to the moon.

Answer:

It is an example of Exothermic reaction.

Explanation:

It leads to release of HEAT as can be seen water is given in gaseous form.

Answer:

1.) First thing to recognize is that it requires you to know the molecular formula for Iron(III) Oxide, which is Fe2O3. If you don't know this formula  in all textbooks there is a page that has it and other compounds listed. I would encourage you to review this page and memorize the other compounds as these compounds will come up in future questions.

2.) Now we will write an unbalanced equation, keeping in mind that molecular oxygen( O2) is used:

Fe + O2 ==> Fe2O3

3.) In balancing problems, I like to always start with Oxygen. Because there are 2 oxygen atoms on the reactant side and  three on the product side and we know that both of these numbers go into 6, we will use this to balance the oxygen. We will put a e in front of the molecular Oxygen and a 2 in front of the iron(III) oxide. This will balance the oxygens.

Fe + 3O2 ==> 2Fe2O3

However, notice now that the iron is still out of balance, This can be easily solved by having a 4 in front of the iron. Now everything is balanced!

4Fe + 3O2 ==> 2Fe2O3

Explanation:

Explanation:

in the chemical reaction an atom in a molecule is replaced by another atom forming the end product .this type of chemical reaction involved only two reactants for example zinc + copper sulphate give us copper sulphate + copper.double displacement reaction is the reaction in which two compounds react together to form two other compounds by mutual exchange of other ions is called double displacement reaction.this type of reaction is involved two or more than two reactants.for example AG and O3 + NaCl give us agcl + nano3

~

ROR

The units of measurement that can be used for precipitation with mm or inches is precipitation, and air temperature.

The Temperature is known to be how hot or cold the air or atmosphere is. It is often measured by the used of a thermometer (in Celsius (C) or Fahrenheit (F), or Kelvin (K) ).

The unit of measurement for precipitation is said to be in millimeters. The unit is known to be in linear depth, that is in millimeters (for volume/area), or in kg m–2 (for the mass/ area).

See full question below

A is air pressure and is a temperature

O A is humidity and precipitation

O A is precipitation, and B is air temperature

O A is wind speed, and B is humidity

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Answer:

Hi

Explanation:

I had the same exact problem and this is how to solve it.

Answer:

object A

Explanation:

since it has less mass it will have greater thermal conductivity

Answer:

A) wrong. The molar is same so A is hevier

B)

Explanation:

Xg/mol × (same molar)= g

→ bigger molar bigger mass

P = W/t

P = F.s/t

P = 1000.3/60

P = 50 watt

Answer:

50 watts

Explanation:

Formula

Power = Work / time

Work = Force  * distance        Substitute the formula for work into power

Power = Force * distance / time

Givens

F = 1000 N

d = 3 meters

t = 60 seconds

Solution

Put the givens into the power formula

Power = 1000 * 3 / 60

Power = 50 watts

No need formula to explain this since it's mainly theory.

In a series circuit, the reading on the ammeter stays the same throughout, this is since current (in the circuit) doesn't change in a series circuit.

so A1 = A2 = An  (n meaning any number of ammeters within the circuit)

This problem is providing the initial volume and pressure of nitrogen in a piston-cylinder system and asks for the final pressure it will have when the volume increases. At the end, the answer turns out to be 2.90 atm.

In chemistry, gas laws are used so as to understand the volume-pressure-temperature-moles behavior in ideal gases and relate different pairs of variables.

In this case, we focus on the Boyle's law as an inversely proportional relationship between both pressure and volume at constant both temperature and moles:

[tex]P_1V_1=P_2V_2[/tex]

Thus, we solve for the final pressure by dividing both sides by V2:

[tex]P_2=\frac{P_1V_1}{V_2}[/tex]

Hence, we plug in both the initial pressure and volume and final volume in order to calculate the final pressure:

[tex]P_2=\frac{2805mL*4.00atm}{3864mL}\\ \\P_2=2.90atm[/tex]

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Answer:

In image :)

Explanation:

The condition of free vaporisation throughout the liquid is called

We can also define it as Free vaporisation throughout the liquid is called boiling, basically its the definition of boiling.

*Note that:- The temperature at which vapour pressure of liquid is equal to external pressure is called Boiling temperature..