What is the percent composition of oxygen in
beryllium nitrate, Be(NO3)2?

Answer: duh

Explanation:

Answer: 99.45 g

Explanation: we have 22.5 g of Platinum in every 1cm3 of Platinum so if we take 4.42 cm3 of Platinum we will have 4.42 × 22.5 g = 99.45 g of Platinum

Answer: First an endothermic and then followed by the exothermic process

Explanation:

Based on the information given in the question, we should note that the entire process is an endothermic process at first and then an exothermic process.

We should note that heat is absorbed during an endothermic process and the environment is cooled but for an exothermic process, heat is being released which leads to the increase in the temperature of the surroundings.

Answer: [tex]Ne:1s^22s^22p^6[/tex]

[tex]Li:1s^22s^1[/tex]

[tex]N:1s^22s^22p^3[/tex]

[tex]S:1s^22s^22p^63s^23p^4[/tex]

[tex]Sc:1s^22s^22p^63s^23p^64s^23d^1[/tex]

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.  The electrons are filled according to Afbau's rule in order of increasing energies.

The electronic configuration for given elements is as follows:

[tex]Ne:10:1s^22s^22p^6[/tex]

[tex]Li:3:1s^22s^1[/tex]

[tex]N:7:1s^22s^22p^3[/tex]

[tex]S:16:1s^22s^22p^63s^23p^4[/tex]

[tex]Sc:21:1s^22s^22p^63s^23p^64s^23d^1[/tex]

Answer:

B

Explanation:

Answer:

Oxygen

Explanation:

If two balloons are filled with hydrogen gas and helium gas respectively, then we want to identify what gas is in each balloon, we have to do so by exposing the both balloons to flame in an oxygen atmosphere.

Hydrogen combines with oxygen in the presence of a flame with quite a loud sound and the flame is sustained but when a flame is brought near helium gas in a balloon, the gas will only make a little sound when exposed to the flame and extinguish the flame.

The reason for the explosion of the gas in the hydrogen balloon is that combustion of hydrogen gas is exothermic. The heating up of surrounding air molecules leads to a sudden explosion.

However, the helium balloon makes a little sound when the balloon is ruptured releasing helium gas which extinguishes the flame.

Answer:

Yttrium

Explanation:

If you somehow subtracted a proton from a Zirconium atom, it would become a Yttrium atom.

When the number of protons in an atom changes a new element is directly formed. The difference between one atom and the other is the based on the number of protons they contain.

Therefore, when Zirconium loses a proton, it changes to Yttrium which is the atom before Zirconium.

Such reactions as this are very common with nuclear reactions. During a nuclear reaction, the nucleus of an atom changes stability.

Answer:

A) The total number of molecules of reactants has to be the same as the total number of product molecules

Explanation:

In chemistry, a chemical equation consists of reactants and products. The reactants are the compounds/substances that chemically combine to give rise to the products. According to the law of conservation of mass, a chemical equation needs to be BALANCED.

A chemical equation is said to be BALANCED when the number of atoms/molecules on the reactant side is equal to that on the product side. In other words, total number of molecules of reactants has to be the same as the total number of product molecules

Answer:

40 Grams

Explanation:

Fe2O3 is 2 parts Iron 3 parts Oxygen.

Assuming the molecular weights of both are equivalent (ideal elemental law), it is a 2:3 ratio, or 2/5 of the total.

2/5 of 100 is 40, so the answer is

40 grams

Answer:

Percent yield = 57.8 %

Theoretical yield  = 11.781 g

Explanation:

Given data:

Mass of CaO produced = 6.81 g

Mass of CaCO₃ react = 20.7 g

Theoretical yield = ?

Percent yield = ?

Solution:

Chemical equation:

CaCO₃       →      CaO + CO₂

Number of moles of CaCO₃ :

Number of moles = mass/molar mass

Number of moles = 20.7 g/ 100.1 g/mol

Number of moles = 0.21 mol

Now we will compare the moles of CaCO₃ with CaO.

                  CaCO₃        :           CaO

                       1              :              1

                      0.21         :           0.21

Theoretical yield of CaO:  

Mass = number of moles × molar mass

Mass = 0.21 mol × 56.1 g/mol

Mass = 11.781 g

Percent yield:

Percent yield = ( actual yield / theoretical yield ) ×  100

Percent yield = (6.81 g/ 11.781 g) × 100

Percent yield = 57.8 %

Answer:

[tex]13.93\ \text{g}[/tex]

Explanation:

Molecular weight of [tex]CaCO_3[/tex] = 100.0869 g/mol

Mass of [tex]CaCO_3[/tex] = 31.7 g

Moles of [tex]CaCO_3[/tex] = [tex]\dfrac{31.7}{100.0869}=0.3167\ \text{mol}[/tex]

Moles of both [tex]CaO[/tex] and [tex]CO_2[/tex] is [tex]0.3167\ \text{mol}[/tex]

Molecular weight of [tex]CO_2[/tex] = 44 g/mol

Mass of [tex]CO_2[/tex] = [tex]44\times 0.3167=13.93\ \text{g}[/tex]

The mass of carbon dioxide formed simultaneously is [tex]13.93\ \text{g}[/tex].

Answer:

0.3 hours of oxygen use will be obtained from the 4.7 L tank.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three.

To solve a direct rule of three, where a, b and c are known data and x is the value to be calculated  the following formula must be followed:

a ⇒ b

c ⇒ x

So [tex]x=\frac{c*b}{a}[/tex]

A value of 15 L/hour indicates that 15 L is consumed in 1 hour. The following rule of three can then be applied: if the average basal rate of oxygen consumption for an adult is 15 L in 1 hour, then 4.7 L in how long will it be consumed?

[tex]time=\frac{4.7 L*1 hour}{15 L}[/tex]

time= 0.3 hours

0.3 hours of oxygen use will be obtained from the 4.7 L tank.

the answer was S=d/t = 60/10 = 6m/s, I'm sorry for getting it wrong the first time I answered ^^

Answer:

the answer is the third one the beak

Answer:

Use less heat in your house.

Explanation:

You have blankets in your house, huddle up for a good movie together.

Answer:

Simple ways to reduce heat loss include

Heat loss through windows can be reduced by using double glazing

Heat loss through walls can be reduced using cavity wall insulation

Heat loss through the roof can be reduced by laying loft insulation

Explanation:

Answer:

it is actually valid.

Explanation:

Take a look at the arctic for example. Global warming caused a change within that climate. Icebergs are melting and predators such as polar bears are losing their food sources. They may soon go extinct.

Answer:

Climate change is a scientifically valid disrupter of exosystems. People need to do something to change their actions or we won't have a future to live in. We don't need to end emissions but completly halt all fossil fuel exploration and extraction now and completly divest from fossil fuels all together.

DO NOT COPY

Answer:

V₂ = 956.52 L

Explanation:

Given data:

Initial pressure = 4 atm

Initial volume = 550 L

Final volume = ?

Final pressure = 2.3 atm

Solution:

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

4 atm × 550 L = 2.3 atm × V₂

V₂ = 2200 atm. L/ 2.3 atm

V₂ = 956.52 L

Answer:

The charge carriers can be electrons, as in metals, or positive and negative ions in the case of ionic (or electrolytic) conductors. In a crystalline solid, the potassium and chlorine atoms are ionically-bonded within a crystalline matrix that prevents them from easily moving.

Explanation:

Hey there!:

Mole ratio :

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

2 moles C₂H₆ -------------------- 7 moles O₂

3.0 moles C₂H₆ ------------------ moles O₂ ??

moles O₂ = 3.0 x 7 / 2

moles O₂ =  21 / 2

moles O₂ = 10.5 moles of O₂

Hope this helps!

Answer:

0.736 moles

Explanation:

mole = mass/molecular mass

mole of H2O = 13.25/18.0

mole of H2O = 0.736

Answer:

44.8 L of N₂.

Explanation:

We'll begin by writing the balanced equation for the. This is illustrated below:

N₂ + 3H₂ —> 2NH₃

From the balanced equation above,

1 mole of N₂ reacted to produce 2 moles of NH₃.

Therefore, Xmol of N₂ will react to produce 4 moles of NH₃ i.e

Xmol of N₂ = (1 × 4)/2

Xmol of N₂ = 2 moles

Thus, 2 moles of N₂ reacted to produce 4 moles of NH₃.

Finally, we shall determine the volume of N₂ required for the reaction. This can be obtained as follow:

1 mole of N₂ occupies 22.4 L at STP.

Therefore, 2 moles of N₂ will occupy = (2 × 22.4) = 44.8 L

Thus, 44.8 L of N₂ is needed to produce 4 moles of NH₃.

Answer:

Because it devolved

Explanation:

The sugar can no longer be seen because upon solubilization;

Definition:

Solubility is characterized by the formation of new bonds between the solute molecules and solvent molecules.

In this case; the solute is sugar while the solvent is Water.

PS: The mixture formed from sugar and water is called Sugar syrup.

Read more:

https://brainly.com/question/24671587

Answer:

Explanation:

The mass of the object can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{2}{12} = \frac{1}{6} \\ = 0.166666...[/tex]

We have the final answer as

Hope this helps you

Answer: Na+ (8%)

Explanation:

Answer:

764.7 mmHg

Explanation:

Step 1: Given data

Step 2: Calculate the partial pressure of the gas collected

The total pressure of the gaseous mixture is equal to the sum of the gas collected and the water vapor.

P = pH₂O + pGas

pGas = P - pH₂O

pGas = 785.8 mmHg - 21.1 mmHg = 764.7 mmHg

Answer:

They can both be used in an electric circuit.

Explanation:

Though conductors and insulators are very different from each other but still they have a similarity that "they can both be used in an electric circuit".

Conductors are the material that allows electricity to flow and insulators have high resistance and do not allow electricity to flow.

Both conductors and insulators are used in an electric circuit as conductor is used in wires, batteries and bulb to flow current while insulators are used in insulation of wire, switches, plugs and etc. Combination of them makes the circuit shock free.

Hence, the correct answer is "They can both be used in an electric circuit."

Answer:

They can both be used in an electric circuit.

Explanation: