Which of the following elements would you expect to be most reactive, based
on the number of valence electrons it has?

Answer:

A. The rate of reaction will increase or go up

B. The rate of reaction will decrase or go down.

Explanation:

Increasing the temperature will make the gas particles move faster. Faster movement will increase rate of collision between particles to cause a reaction. Decreasing the temperature will cause the opposite to happen.

According to the mole concept, 4.2 g of baking soda should be weighed out.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Baking soda has molar mass of 84 g /mole, thus mass is calculated using number of moles formula which is mass= molar mass×number of moles, which is mass=84×0.050=4.2 g.

Thus,4.2 g of baking soda should be weighed out by chef.

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Answer:

Explanation:

Element -

It is the basic unit of matter, which cannot be broken down into substances by any way but can be combined to form new substances.

It is a pure substance.

It classifies into metals, non-metals, metalloids and noble gases.

Example - Hydrogen, Carbon, Oxygen

Compounds -

It is a combination of two or more elements.

It is a pure substance.

Through chemical reactions, they can be broken down into metals.

Example - Water, Carbon dioxide

Mixtures -

It is a combination of two or more elements or compounds or both.

The substances combined in a mixture are in a particular ratio.

Example - Chalk powder, Washing Soda

Answer:

Any individual offspring produced through asexual reproduction is always: genetically identical to its parent. made up of cells with a cell wall. different from all of its siblings

Answer:the element is potassium

the proton and electron is 19 and the nuetron is 19

Explanation:

Answer:

The atomic number gives the number of protons 19

p = 19

The atomic mass is the sum of the protons and neutrons

p+n = 39 p = 19

Put p into the equation and solve for n the neutrons

19+n = 39

Subtract 19 from both sides

19-19+n = 39-19

n = 20

The number of electons equal the number of protons in a neutral atom. The positive charge equal to the negative charge. The negative charge is the number of electons. This ion has a charge of +1. So solve for the negative charge.

-19+1 = -18

The negative charge is -18 so

e = 18

40

Explanation:

because its Saturated

Answer:

A. all of them

Explanation: Edtell

Answer:

the name of reaction that produces esters is dehydration.

Answer:

Measurement is defined as the act of measuring or the size of something. An example of measurement means the use of a ruler to determine the length of a piece of paper. ... Extent, quality, or size as determined by measuring; dimension. A waist measurement of 32 inches.

Explanation:

The comparison o unknown quantity with known standard quantity is called measurement.

Answer:

C

electrons are negatively charged particles

Answer: D

Explanation:

just took the test

Answer:

A. N2(g) + 3H2(g) Right arrow. 2NH3(g)

B.C(s) + 2H2(g) Right arrow. CH4(g)

Explanation:

Answer:

a and b

Explanation:

second question

miultiplu second eq by 2

The first shell can only hold 2 electrons, but the pupil placed in 8 electrons.

The second shell can hold up to 8 electrons, but the pupil only placed in 2 electrons.

Flourine only has 9 total electrons, yet there are 10 electrons in the diagram.

Answer:

Explanation:

In the Fluorine atom there are 2 electrons in the innermost shell and 7 i the outer shell.

Ca(s)+ H2O (l)----->H2 +Ca(oH)2

Ca(s)+2H2O(l)----->H2(g)+Ca(oH)2

I hope this helps

sorry if it's wrong

Answer:

The error includes;

a) The wrong denominator for the equivalent fraction of kilograms to grams

b) The use of the scale factor of length rather than the scale factor of volume for the equivalent fraction of cubic centimeters to cubic meters

c) The arrival at the correct 1000 kg/m³ rather than 0.1 g/m³ based on the expression on the left of the equation

Explanation:

The density of water = 1 g/cm³

The given equation is presented as follows;

1 g/cm³ × 1 kg/(1000 kg) × 100 cm³/(1 m³) = 1000 kg/m³

The error in the conversion method are;

a) The conversion, 1 kg/(1,000 kg) has an error, the correct conversion is (1 kg)/1,000 g)

b) The volume conversion error, 100 cm³/(1 m³), the correct volume conversion is (100 cm)³/(1 m³) = 1,000,000 cm³/(1 m³)

c) The right of the equal to sign error; using the left side expression only, the (wrong) answer is 0.1 g/m³

The correct equation is presented as follows;

1 g/cm³ × 1 kg/(1000 g) × 1,000,000 cm³/(1 m³) = 1000 kg/m³

Answer:

C. 1,000 kg should be written as 1,000 g.

Explanation:

Got it right on my test :)

Answer:

Isotopes

Explanation:

An isotope are the atoms of an element with similar chemical identity and number of protons but different atomic masses. This means that isotopes of an element differ from one another by their number of NEUTRONS.

For example, the uranium element possesses isotopes as follows: Uranium-235 and uranium-238. This two isotopes have the same chemical identity and number of protons/atomic no., which is 92. However, the atomic masses (235 and 238) are different.

Answer:

Isotopes

Explanation:

Explanation:

a) m (metre)

b) mm (millimeter)

Answer:

Would be increasing the concentration of SO3 as you chose in the question.

Explanation:

Increasing the concentration of the reactant will most likely shift it to the right by adding more products.

Answer:

tác dụng với acid,

Explanation:

Explanation:

This reaction is also known as double decomposition reaction.

HCl + CaCO3 + MgCO3 → H2O + H2 + CO2 + CaCl2 + MgCl2

Answer: The average percent yield of MgO is 98.59 %.

Explanation:

The chemical equation follows:

[tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of Mg = 0.411 g

Molar mass of Mg = 24.3 g/mol

Plugging values in equation 1:

[tex]\text{Moles of Mg}=\frac{0.411g}{24.3g/mol}=0.0170 mol[/tex]

By the stoichiometry of the reaction:

If 2 moles of Mg produces 2 moles of MgO

So, 0.0170 moles of Mg will produce = [tex]\frac{2}{2}\times 0.0170=0.0170mol[/tex] of MgO

We know, molar mass of [tex]MgO[/tex] = 40.3 g/mol

Putting values in equation 1, we get:

[tex]\text{Mass of }MgO=(0.0170mol\times 40.3g/mol)=0.685g[/tex]

The percent yield of a reaction is calculated by using an equation:

[tex]\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100[/tex] ......(2)

Given values:

Actual value of the product = 0.675 g

Theoretical value of the product = 0.685 g

Plugging values in equation 1:

[tex]\% \text{yield}=\frac{0.675g}{0.685g}\times 100\\\\\% \text{yield}=98.54\%[/tex]

Hence, the % yield of the product is 98.54 %

Given mass of Mg = 0.266 g

Molar mass of Mg = 24.3 g/mol

Plugging values in equation 1:

[tex]\text{Moles of Mg}=\frac{0.266g}{24.3g/mol}=0.011 mol[/tex]

By the stoichiometry of the reaction:

If 2 moles of Mg produces 2 moles of MgO

So, 0.011 moles of Mg will produce = [tex]\frac{2}{2}\times 0.011=0.011mol[/tex] of MgO

We know, molar mass of  = 40.3 g/mol

Putting values in equation 1, we get:

[tex]\text{Mass of }MgO=(0.011mol\times 40.3g/mol)=0.443g[/tex]

The percent yield of a reaction is calculated by using an equation:

[tex]\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100[/tex] ......(2)

Given values:

Actual value of the product = 0.437 g

Theoretical value of the product = 0.443 g

Plugging values in equation 1:

[tex]\% \text{yield}=\frac{0.437g}{0.443g}\times 100\\\\\% \text{yield}=98.64\%[/tex]

Hence, the % yield of the product is 98.64 %

Average of a measurement is calculated by given formula:

[tex]Average=\frac{M_1+M_2}{2}[/tex]

where,

[tex]M_1[/tex] = percentage yield for Trial 1 = 98.54 %

[tex]M_2[/tex] = percentage yield for Trial 2 = 98.64 %

Putting values in above equation, we get:

[tex]Average=\frac{98.54+98.64}{2}=98.59\%[/tex]

Hence, the average percent yield of MgO is 98.59 %.

Answer:

Explanation:

The most prominent function of mitochondria is to produce the energy currency of the cell, ATP (i.e., phosphorylation of ADP), through respiration and using sugar as fuel, and to regulate cellular metabolism .

Answer:

is this true and false? then its true

Explanation:

Answer:

Fe(s) + H2SO4 (aq) ---> FeSO4 (s) + H2 (g)

Explanation:

The thickness of one button will be 2mm

* N.B: We convert the height of the 12 buttons to same unit (mm)

Then, 2cm = 2 × 10 = 20mm

20mm + 4mm = 24mm

24/12 = 2mm thick

Hence, one button is 2mm thick.

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Answer:

Kinetic energy

Explanation:

Kinetic energy is the energy associated with an object's motion. It is mass and velocity dependent by a directly proportional relationship.

Potential energy is the energy associated with an object's position.

Thermal energy is the energy associated with heat addition or withdrawal.

Kinetic energy is the energy that a body possesses because of its movement, that is, it is the energy that arises when objects are in motion.

Therefore, we can conclude that kinetic energy is the energy produced by its movements that depends on its mass and speed.

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Answer:

See explanation

Explanation:

Tyndall effect refers to the scattering of light in a solution. Tyndall effect occurs when the size of particles in the solution exceeds 1 nm in diameter. Such solutions are actually called false solutions.

In tincture of iodine, the size of particles in solution is less than 1 nm in diameter hence the solution does not exhibit Tyndall effect. Hence, tincture of iodine is a true solution.

Therefore, if the size of particles in solution exceeded 1nm in diameter, Tyndall effect is observed.

Answer:

i cant understand what you wrote

Explanation:

it's a blank screen

Answer:

Zn²⁺ + 2Ag → Zn + 2Ag⁺

Explanation:

According to the reduction potential chart, silver ion (Ag⁺) is a stronger oxidizing agent than zinc (Zn), which is a reducing agent the compared to silver

Therefore, the redox reaction that will occur is that the zinc, Zn, will be oxidized to Zn²⁺ ion, while the silver, Ag²⁺ ion will be reduced to silver deposits Ag, therefore, the zinc will displace the silver in the solution containing silver and zinc ions because zinc is higher than silver in the reactivity series

The reduction potential Zn → Zn²⁺ + 2e⁻ = +0.76

The reduction potential for Ag⁺ + e⁻ → Ag = +0.8

Given that redox reactions are reversible, we get the following likely redux reaction:

Zn(s) + 2Ag⁺(aq) ⇄ 2Ag(s) + Zn²⁺(aq)

Zn²⁺(aq) + 2Ag(s) → Zn(s) + 2Ag⁺(aq) is the reaction most likely to occur.

Answer:

Having high melting point.

Explanation:

The original product has high melting point as compared to the mixture product because in the original product, the element is present in its pure state and we know that pure substances have high melting point as compared to mixture substances due to the presence of strong intercellular forces between them which is hard to break so that's why we can say that the original product has high melting point.