Which of these represents an individual form of life such as an animal, plant, or single-celled life form?

a
Organ

b
Organism

c
Organ system

d
Tissue

Answer:Photon

Explanation: hope it helped

Answer:

B: electronegativity

Explanation:

Electronegativity is the measure of how strongly atoms attract bonding electrons to themselves.

A is incorrect because Atomic radius though decreases as you go from lithium to fluorine of the periodic table. Atomic radius increases when you go from either top to bottom of the periodic table, or if you go from right to left. So answer A is inaccurate.

C is incorrect because in period 2, all the elements have two electron subshells. For example, Al has 13 electrons. So it has two electron subshells. This is since the first subshell has only two valence electrons and while the second subshell in Al has 11 valence electrons. Therefore, it is inaccurate to say this answer.

D is incorrect because in the first shell, you can only have a max of two electrons. The first shell neither decreases or increases. Therefore, D is inaccurate too.

B is correct because as you go from the periodic table from left to right, the electronegativity and ionization energy increases. This is since the more valence electrons an element has, the more electronegative is.  Fluorine for example is desperately trying to get one more electron to have a total of 8 electrons. It wants to have a full shell. Therefore, B is the most relevant answer.

As the chemical elements in Period 2 are considered in order from lithium to fluorine, there is an  increase in: B)  electronegativity.

On a periodic table, the horizontal columns represents the periods of chemical elements in ascending order such as from lithium (Li) to fluorine (F).

Electronegativity can be defined as a measure of the ability (tendency) of an atom of a chemical element to attract any shared pair of electrons.

Generally, the electronegativity of a chemical element typically increases across the period from left to right.

For example,  electronegativity increases from lithium (Li) to fluorine (F) in Period 2 on a periodic table.

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Answer:

-------> CH2 + Ca(OH)2

0.59 moles

111 moles

30 moles

0.15 moles

Answer:

Br2Mg

Explanation:

Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... The empirical formula of the compound is MgBr[tex]_2[/tex].

Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.

The relation between empirical formula and molecular formula can be given as

n= molecular formula÷ empirical formula

where n= 1,2,.....

Number of gram atoms in compound and divide by smallest Number of gram atoms in compound

mole = given mass/molar mass

32.0g×1 mole/79.9g = 0.401 mole Br

4.9g × 1mole/24.31= 0.20 mole Mg

The mole ratio between Br and Mg is 2:1

The empirical formula of the compound is MgBr[tex]_2[/tex].

Therefore, the empirical formula of the compound is MgBr[tex]_2[/tex].

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Answer:

A is a physical change, no atoms are being lost its still in it original form

B is a chemical change, it is losing atoms and changing into a new substance

Explanation:

The coefficients :  3, 2, 1,3

Given

Reaction

Mg + H3PO4 -> Mg3(PO4)2 + H2

Required

The coefficients

Solution

Steps to balance reactions:

1. Give a coefficient(The most complex compound is assigned a coefficient of 1)

aMg + bH₃PO₄ ⇒ Mg₃(PO₄)₂ + cH₂

2. Make an equation

Mg, left = a, right = 3 ⇒a=3

P, left = b, right = 2⇒b=2

H, left = 3b, right = 2c⇒3b=2c⇒3.2=2c⇒2c=6⇒c=3

The equation becomes :

3Mg + 2H₃PO₄ ⇒ Mg₃(PO₄)₂ + 3H₂

Answer:

NaOH

Explanation:

The limiting reactant is the reactant in short supply in an experiment.

We have been given:

 Number of moles of H₃PO₄   = 1.75mle

Now from the balanced reaction equation:

         1 mole of H₃PO₄ will require 3 moles of NaOH to react with

         1.75 mole of H₃PO₄ will then require 1.75 x 3  = 5.25mole of NaOH

But the given amount of NaOH is 5mole, so NaOH is the limiting reactant.

Phosphoric acid reacts with sodium hydroxide. If 1.75mol H[tex]_3[/tex]PO[tex]_4[/tex] is made to react with 5.00mol NaOH, NaOH is the limiting reactant.

Reagents that are entirely consumed by a chemical reaction are known as limiting reagents. They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, based to the stoichiometry of chemical reactions. The limiting reagent is the one that is completely consumed during a reaction.

Number of moles of H[tex]_3[/tex]PO[tex]_4[/tex]  = 1.75mle

1 mole of H[tex]_3[/tex]PO[tex]_4[/tex] require 3 moles of NaOH

1.75 mole of H[tex]_3[/tex]PO[tex]_4[/tex] require 1.75 x 3  = 5.25mole of NaOH

NaOH = 5mole, so NaOH is the limiting reactant.

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Answer:

making the decision to buy a lottery ticket

Explanation:

all the others are q result of a thought........whereas the last one is actually one of the thoughts

Answer:

group two elements are called alkaline earth metals

Explanation:

Because their oxides form in the earth and are water soluble

Answer:

q = m x Cp x ΔT

Explanation:

In the range of temperatures from 15°C to 95°C, water is in the liquid phase. So, the heating process is within the liquid phase and does not involve a change of phase. Therefore, the equation used to calculate the heat absorbed (q) is:

q = m x Cp x ΔT

Where m is the mass of water, Cp is the specific heat of water and ΔT is the change of temperature (in this case: 95°C - 15°C = 80°C).

Answer:

1)magnesium nitrate +hydrogen

2)calcium chlorine+hydrogen

3)zinc sulfate +hydrogen

Explanation:

hope it helps

Answer:

Explanation:

Soil is made up of different components such as the organic matter, mineral content, air and water.

We find nutrient rich soil near volcanoes due to the geological processes involve.

Answer:

There are two electrodes in an electrolysis solution: the positive and the negative electrode. The reaction that happens at each electrode is different. ... Positively charged ions (metals and hydrogen), are attracted to the negative electrode (the cathode), where they receive electrons (a process known as oxidation).

Explanation:

A half equation is used to represent the reaction that happens at an electrode during electrolysis . It shows what happens when ions gain or lose electrons .

hope this helps ^^

Answer:

Halogens

Explanation:

From the given choices, the halogens will have the smallest radius within the same period.

The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.

Since halogen is the right most group from the choices given, it will have the smallest radius.

Answer:

Strontium (St)

Explanation:

The atom that will have a larger radius than zinc is strontium, Sr.

Atomic radius is defined as the half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state of metals.

Considering the definition of atomic radius, the atom that will have a larger radius than zinc is strontium, Sr.

The atomic radius represents the distance between the nucleus and the valence shell, which is the outermost shell. By means of the atomic radius it is possible to determine the size of the atom.

But the size of the atom or atomic radius is not an easy parameter to determine, since the electrons are not located in defined orbits, at fixed distances from the nucleus, but rather move chaotically in areas of space where the probability of finding the electron is greater than 90%.

Therefore, the atomic radius is considered as half the distance that separates two neighboring nuclei.

By increasing the atomic number of the elements in a group, that is, by going down in a group, the number of occupied levels is increased. Consequently, the atomic radius increases.

On the other hand, the atomic radius decreases as you advance through a period. This is due to the fact that when advancing in a period, while the number of electron shells remains the same, the positive charge of the nucleus increases due to the increase in the atomic number, that is, the number of protons, which have a positive charge. This causes the electrons to move closer to the nucleus, thus decreasing the radius.

In summary, in the groups, the atomic radius increases with the atomic number, that is to say downwards, while in the periods it decreases with increasing Z, towards the right.

Since strontium satisfies the criteria explained previously, it has the largest atomic radius.

Finally, the atom that will have a larger radius than zinc is strontium, Sr.

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Answer:

Yes because all solids have some thermal energy, its atoms do vibrate. However, this movement is very small and very rapid, and cannot be observed under ordinary conditions. When heat is added a solid can become a liquid.

Explanation:

Have A Wonderful Day !!

Answer:

hope it helps.

Explanation:

Zinc metal dissolves slowly in dilute sulphuric acid to form solutions containing the aquated Zn(II) ion together with hydrogen gas, H2.

The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.

A student sets up a controlled experiment to test whether aluminum bats hit baseballs further than wooden bats. After measuring the distance travelled by hundreds of struck baseballs, by both high school and professional players.

He concludes that wooden bats hit baseballs further because professional players use wooden bats and hit the ball much further than high school players who use aluminum bats. If aluminum bats were permitted for use in baseball then a lot of teams would begin to use them instead. This would reduce the demand for wooden bats and lead to their prices falling.

Therefore, The flaw in his approach or his flaw is that he used professional players and high school players this makes the experiment uncontrolled because the players are at two levels of strength.

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Answer:

See explanation

Explanation:

Rutherford concluded that most of the atom was empty space because of the large number of alpha particles that passed through the gold foil without being deviated.

The deflected particles must have hit the positive core of the atom where most of its mass was concentrated.

From our idea of electricity, positive and negative charges attract each other. If the atom was largely filled with electrons, then the positively charged alpha particle will stick to the electrons due to Coulumbic attraction. This would have been Rutherford's  conclusion if the alpha particles had stuck to the atom.

what can be deduced about the atom's structure if α-particles had stuck to the atom is :

The alpha particles passed through the gold foil used in Rutherford's experiment without been deviated and Rutherford deduced that most of the atoms were empty while some particle were deviated most passed through freely.

If the alpha particles stick to the atom we can deduce that the atom is filled with electrons which are negatively charged particles and this is because in magnetism and electricity unlike poles and unlike charges attract each other while like charges repel one another.

Hence we can conclude that The atom is filled electrons which are negatively charged.

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Answer:

A.

Explanation:

Its [Ar] 3d¹⁰4s²

[tex]\displaystyle 0.75 \ mol \ Cl_2[/tex]

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Stoichiometry

Step 1: Define

[RxN] 2Na + Cl₂ → 2NaCl

[Given] 34.485 g Na

Step 2: Identify Conversions

[RxN] 2 mol Na = 1 mol Cl₂

Molar Mass of Na - 22.99 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 5 sig figs.

Since our final answer has 2 sig figs, there is no need to round.

Answer:

10 moles of methane

Explanation:

1 mole of methane contains 6.02 × 10^23 molecules (Avogadro's number)

x moles should contain 7.02 x 1024 molecules of

methane

So,

x= 7.02 x 1024 × 1/6.02 × 10^23

x= 10 moles of methane

Answer:

2

Explanation:

because it helps to balance the equation

Answer:

2

Explanation:

We want to balance the equation. On the right, there are 4 hydrogens, and 2 oxygens. We should have the same amount on the left.

For hydrogens, we want 4. 2 *2 =4,

Therefore, the answer is 2

I hope this helps! :)

a) parsimony/thriftiness

Answer:

35.1 grams H2O

Explanation:

Using the molar mass of water (18.016 g/mol):

1.95 mol H2O * (18.016 g H2O / 1 mol H2O) = 35.1312 g H2O --> 35.1 g H2O (with sig figs)

Answer:27

Explanation:

Took the test

Answer:

30 slices of pie

Explanation:

10 colleges = 30 essays

30 essays= 60 hours of work

60 hours = ( 500*60)

30,000 calories expended = 30 slices of pie

I wouldn't recommend eating that much pie.

Answer:

D.   It is converted into kinetic energy.

Explanation:

When a book is dropped from a desk to the floor, the potential energy of the book is converted to kinetic energy as it falls.