Why put aluminum foil on door knobs when you are alone.

Answer:

this is the result

Explanation:

36.0

BE=4

36.0÷4

= 9

#1

#2

Yes here we can see the dots and crosses clearly.

#3

It's Methane or CH_4

#4

There is no double bond

Answer:

#1

See H and C have shared their electrons so its Covalent bonding

#2

Yes, here we can see the dots and crosses clearly.

Dot and crosses diagram

#3

It's Methane or CH_4

4 single bonds

#4

There is no double bond

Explanation:

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Answer:

How did John D Rockefeller make his fortune? Rockefeller founded the Standard Oil Company in 1870. He ran it until 1897, and remained its largest shareholder.

Answer:

oil

Explanation:

Answer:

As the egg ages, air enters the egg and the air cell becomes larger and this acts as a buoyancy aid. Generally, fresh eggs will lie on the bottom of the bowl of water.

Eggs that tilt so that the large end is up are older, and eggs that float are rotten.

Explanation:

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Answer:

hydrogen

Explanation:

hydrogen has 1 proton, 0 neutrons and one electron

Answer:

There is only one stable atom that does not have neutrons.

Explanation:

To solve this problem, let's write out the equation of reaction

[tex]Li_2O + H_2O \to 2LiOH[/tex]

The pH of a solution indicates it's level of acidity. But in this question, lithium oxide dissolves in water to produce lithium hydroxide.

We can calculate the acidity of the solution by;

The numbers of moles is

[tex]n = \frac{mass}{molar mass}\\n = \frac{2.6}{30}\\n = 0.086 moles[/tex]

1 mole of Li2O produce 2 moles LiOH

0.086 moles of H2O will give

[tex]2 * 0.086 moles = 0.173 moles of LiOH[/tex]

The molarity of LiOH

[tex]n = \frac{moles}{volume} = \frac{0.173}{1.70} = 0.102M[/tex]

Since we have the pOH of the solution, let's calculate the pH of the solution

[tex]pH + pOH = 14\\pH = 14 - pOH\\pOH = 0.99\\pH = 14 - 0.99 = 13.009[/tex]

The pH of the solution is equal to 13.0

Learn more on pH of a solution here;

https://brainly.com/question/13557815

Answer:

Food, safe water, housing, education, and health care are examples of basic needs. Wants are desires that can be satisfied by goods and services.Secondary needs are the desires and wants that become important when primary needs are satisfied. Definition (2): Secondary needs are connected with the desire for satisfaction and pleasure of the human being: designer articles or furniture, the high-tech and the newest cell phone, jewelry, a luxury car, etc.

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Answer:

Image result for Based on the traits, which traits were most prevalent in the class? Did you have more traits aligned with the dominant traits or more that were rare? If you have a rare trait, which do you have?

The Big Five personality traits are extraversion (also often spelled extroversion), agreeableness, openness, conscientiousness, and neuroticism. Each trait represents a continuum. Individuals can fall anywhere on the continuum for each trait. The Big Five remain relatively stable throughout most of one's lifetime.

Explanation:

Answer:

2.00 mol/L   or   2.00 M

Explanation:

500 mL ( 1 L / 1,000 mL) = 0.500 L

M =  1 mole NaNO3 /  0.500 L =   2.00 mol/L   or   2.00 M

Hope this Helps!!!!

Answer:

Fe2O3 + 3CO → 2Fe + 3CO2

Explanation:

the numbers in front are the numbers you need

[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]

Here's the balanced chemical equation for given reaction ~

[tex] \sf Fe_2O_3 (s) +3 \: CO (g) =2 \: Fe(l) + 3\: CO_2 (g)[/tex]

As we can see, the Coefficient of Fe (l) is 2

Answer:

Photosynthesis

Explanation:

If thats one of the options, thats the answer. Let me know if its not, and I'll be glad to help :)

Answer:

photosynthesis is the answer

Explanation:

because organisms convert light energy into chemical energy which can be stored in molecular bonds

The theoretical yield of iron metal is 42.3 g

The equation for the reaction is:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Since, all of the carbon monoxide was consumed during the reaction, then carbon monoxide is the limiting reactant

Thus, iron (III) oxide is the excess reactant

From the question, we are to determine the theoretical yield of iron metal

First, we will write the balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

Fe₂O₃ + 3CO → 2Fe + 3CO₂

This means

1 mole of iron(III) oxide reacts with 3 moles of carbon monoxide to produce 2 moles of iron metal and 3 moles of carbon dioxide gas.

Now, to determine the theoretical yield of iron metal

First, we will determine the number of moles of each reactant present

Mass = 75.0 grams

Molar mass = 159.69 g/mol

Using the formula,

[tex]Number \ of \ moles = \frac{Mass}{Molar\ mass}[/tex]

Then,

Number of mole of Fe₂O₃ present = [tex]\frac{75.0}{159.69}[/tex]

Number of mole of Fe₂O₃ present = 0.46966 mole

Mass = 50.0 g

Molar mass = 44.01 g

Then,

Number of moles of CO₂ present = [tex]\frac{50.0}{44.01}[/tex]

Number of moles of CO₂ present = 1.136105 moles

Now,

If 1 mole of iron(III) oxide reacts with 3 moles of carbon monoxide to produce 2 moles of iron metal

Then,

0.378702 mole of iron(III) oxide will react with 1.136105 moles of carbon monoxide to produce 0.757403 moles of iron metal

Therefore, the number of moles of iron metal that would be produced is 0.757403 moles

Now, for the mass of the iron metal

Using the formula

Mass = Number of moles × Molar mass

Atomic mass of iron metal = 55.845 g/mol

Then,

Mass of iron metal that would be produced = 0.757403 × 55.845

Mass of iron metal that would be produced = 42.29717 g

Mass of iron metal that would be produced ≅ 42.3 g

Hence, the theoretical yield of iron metal is 42.3 g

The equation for the reaction is:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Since, all of the carbon monoxide was consumed during the reaction, then carbon monoxide is the limiting reactant

Thus, iron (III) oxide is the excess reactant

Learn more on Stoichiometry here: https://brainly.com/question/6061451

Answer:

start moving faster

Explanation:

i would guess because they slow down our freeze when they get cold

Answer:

have just recently learnt the theory of fractional and normal distillations and the basics of maximum and minimum boiling azeotropes.

It forms magnesium oxide by reacting with oxygen

The balanced equation is provided by

[tex]\\ \rm\hookrightarrow 2Mg+O_2=2MgO[/tex]

On both sides

Hence balanced

Answer:

5.075moles

Explanation:

First get the molecular mass of beryllium which is 4g/mol.

Then input your given mass...

Formular for mole =mass/molecular mass

Mole=20.3g/4g/mol

=5.075moles

Answer:

b : they move to the positive electrode

Explanation:

they lose electrons to form chlorine atoms. The atoms join up in pairs to form Cl² molecules , so chlorine gas is formed at the positive electrode

Answer:

Basaltic magma is formed through dry partial melting of the mantle. The mantle lies just below the crust of the earth. Basalts make up most of the ocean’s crust; this is why basaltic magma is typically found in oceanic volcanoes. See also what substances are emitted from fumaroles? What type of melting produces most basaltic magmas?

Explanation:

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Answer:

239

Explanation:

i think this is the answer

Answer:

B- to study the surface of the moon

Answer:

The Celsius scale sets the freezing point and boiling point of water at 0°C and 100°C respectively. The Kelvin scale is based on molecular motion, with the temperature of 0 K, also known as absolute zero, being the point where all molecular motion ceases.

Explanation:

The chemical formula of a compound with a formula mass of 17 will be NH3

The formula mass of a compound or molecule is derived by summing the average molar weight of the individual atoms that make up the compound or molecule.

In this case, the formula mass is 17.

For ammonia with chemical formula NH3;

Molar weight of H = 1

Molar weight of N = 14

Formula mass = (14) + (1 x 3)

                          = 17 AMU

More on formula mass can be found here: https://brainly.com/question/867780

Answer: NH3

Explanation:

Answer:

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Answer:

2.835 moles of carbon

Explanation:

By definition, there are 6.022x10^23 atoms (or compounds) in one mole.

Write and use this as a conversion factor:

(6.022x10^23 atoms)/mole

(1.707 x 10^24 atoms of carbon)/((6.022x10^23 atoms)/mole) = 2.835 moles carbon

pH = - log [H⁺]

pH = 7.5

[tex]\tt [H^+]=10^{-7.5}=3.16\times 10^{-8}[/tex]

pH + pOH = 14

7.5 + pOH = 14

pOH = 6.5

[tex]\tt [OH^-]=10^{-6.5}=3.16\times 10^{-7}[/tex]

Answer:

So, the right answer is. No. of moles of FeS₂ = 0.25 mole. Explanation: From the balanced. 4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2.

Explanation:

Answer:

A. It is used for the phase change.