What is the mass number of an atom that contains 12 protons, 14 neutrons, and 12 electrons? *
10 points
2
26
24
168

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! :)

Answer:

0.087 moles of water

Explanation:

Given data:

Number of molecules of water = 5.24×10²² molecules

Number of moles of water = ?

Solution:

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules of water

5.24×10²² molecules × 1 mol / 6.022 × 10²³ molecules

0.87×10⁻¹ mol

0.087 mol

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:

nertial mass is a measure of how difficult it is to change the velocity of an object. Example. Calculate the force needed to accelerate a 22 kg cheetah at 15 m/s².

Explanation:

Answer:

1)magnesium nitrate +hydrogen

2)calcium chlorine+hydrogen

3)zinc sulfate +hydrogen

Explanation:

hope it helps

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:

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:

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:

There will be 2 nitrogen and 2 oxygen atoms in the product.

Explanation:

In a chemical reaction, atoms are neither created or destroyed, which means if there are 2 nitrogen atoms in the reactants, there will be 2 nitrogen atoms in the products. Similarly, if there are 2 oxygen atoms in the reactants, there will be 2 oxygen atoms in the products.

Let me know if this helps!

a) parsimony/thriftiness

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

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:

This is false

Answer:

100% false

Explanation:

common sense

Answer:

1 mole

Explanation:

A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

Answer:

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

0.59 moles

111 moles

30 moles

0.15 moles

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:

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:

Radiation

Explanation:

Radiation is energy that comes from a source and travels through space or heat energy through the air

I hope this helps u..

Answer:

15.24 × 10²³ atoms

Explanation:

Given data:

Number of atoms of Na = ?

Number of moles of Na = 2.53 mol

Solution:

1 mole contain 6.022× 10²³ atoms.

2.53 mol × 6.022× 10²³ atoms / 1mol

15.24 × 10²³ atoms

The number 6.022 × 10²³ is called Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

Answer:

Its D. Water

Explanation:

hope this helps :)

Explanation:

I think it means that even if you dont succeed at something the first time you do it doesn't mean you sould give up.

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:

118750 ml

Explanation:

The chemical equation for complete combustion of hexane is given as;

2C6H14 + 19O2 → 12CO2 + 14H2O  

From the equation of the reaction;

2 mol of C6H14 reacts with 19 mol of O2

2 ml of C6H14 reacts with 19 ml of O2

2500 mL of C6H14 would react with x ml of O2

2 = 19

2500 = x

x = 2500 * 19 / 2 = 23750 ml

Since oxygen is 20% of air;

23750 = 20 / 100 * (Volume of air)

Volume of air = 23750 * 100 / 20 = 118750 ml

Answer: metal i believe

Explanation:

Answer:

It is a rare and lustrous silvery-white metal

Explanation:

[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:

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:

A.

Explanation:

Its [Ar] 3d¹⁰4s²

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.