Help please!! I’ll mark you brainliest!!

Answer:

The reaction combines the sodium with the hydrogen and oxygen in water to form sodium hydroxide and hydrogen gas, and you get a lot of energy released as heat as well. This heat actually melts any remaining sodium that has not reacted yet, and ignites the hydrogen gas, so you get the bang and the flash.

Explanation:

Answer:

um

Explanation:

help you? you mean do it for you? nah man you can just use the calculator ;)

Explanation:

The equation of the reaction is given as;

12C + 16 H2 --> 4 C3H8

a. Simplify the equation;

The coefficients are 12, 16 and 4.

4 is a common factor, so divide all through by 4.

12/4 = 3, 16/4 = 4, 4/4 = 1

The equation is given as;

3 C + 4 H2 -->  C3H8

b. If 21 moles of  C3H8 are formed, how many moles of C was needed.

From the reaction;

3 mol C atoms reacts to form 1 mol of  C3H8

x mol would react to form 21 moles of  C3H8

3 = 1

x = 21

x = 21  * 3

x = 63 moles

Considering the definition of percentage by mass, the correct answer is option D. the percent composition of carbon dioxide is 6.6%

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

[tex]percentage by mass=\frac{mass of solute}{mass of solution} x100[/tex]

In this case, you know:

Replacing in the definition of percentage by mass:

[tex]percentage by mass=\frac{13.203 grams}{200 grams} x100[/tex]

Solving:

percentage by mass= 6.60 %

Finally, the correct answer is option D. the percent composition of carbon dioxide is 6.6%

Learn more about percentage by mass:

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Answer:

D. 1

Explanation:

Just took it :)

The element that would be found in Group 13 is

D. 1

The electron dot structure has three valence electrons.

Group-13 is also known as the Boron family. This group belongs to p-block elements. The elements of this group will have three electrons in their outermost shell i.e. 3 valence electrons.

Example: Boron has atomic number 5.

Electronic configuration of Boron: [tex]1s^2 2s^2 2p^1[/tex]

Thus, the electron dot structure for group-13 is option D i.e. 1.

Find more information about Group-13 elements here:

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Answer: Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion. Energy is released when an atom gains valence electrons and forms a negative ion

If all the particles in a material are made up of

several smaller particles, and every larger particle

is identical, is the material a pure substance or

not? Explain your reasoning.

A pure substance is something like a compound and element. This material made of several particles which seem to be two different particles, I believe, is a mixture. So, it is not a pure substance mixtures are made up of more than one particle while compounds (In a fixed ratio, the fusion of two or more than two atoms) and elements are made up of one molecule essentially.

The given material is not a pure substance as it is made up of several smaller particles and some larger particles that are identical.

A pure substance is defined as a substance that has fixed chemical composition throughout the substance. A pure substance are not necessarily have to be of single substance or compound.

The given material is not a pure substance because it is made up of several different small particles. The material is made up of both small particle and large particles and both the particle do not have similar composition.

A pure substance is a homogeneous mixture. These substance has similar composition throughout the substance size of the particle  does not matter.

Thus, it is not a pure substance as it is made up of several smaller particles and some larger particles that are identical.

To learn more about pure substance, refer to the link below:

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Answer:

It looks right to me make sure you have sig figs if the question asked for it though so you smalles figure would be 3 so with sig figs your answer would be 1190cm3

Answer:

B -1 and +7

Explanation:

Iodine shows oxidation states of −1, +1, +3, +5, or +7.

Answer:The 1st Quarter Moon is a primary Moon phase when we can see exactly half of the Moon's surface lit up. ... The First Quarter Moon rises around midday and is visible in the day sky. ... when the Moon has reached the first quarter of its orbit around Earth, hence the name. ... Full Moon Names · Taking pictures of the Moon.

Explanation:

Answer: D. 1600 L

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}[/tex]

[tex]\text{Number of moles of nitrogen}==\frac{1000L}{22.4L}=44.6moles[/tex]

[tex]\text{Number of moles of hydrogen}==\frac{2400L}{22.4L}=107.1moles[/tex]

[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]  

According to stoichiometry :

3 moles of [tex]H_2[/tex] require 1 mole of [tex]N_2[/tex]

Thus 107.1 moles of [tex]H_2[/tex] will require=[tex]\frac{1}{3}\times 107.1=35.7moles[/tex] of [tex]N_2[/tex]

Thus [tex]H_2[/tex] is the limiting reagent as it limits the formation of product and [tex]N_2[/tex] is the excess reagent.

As 3 moles of [tex]H_2[/tex] give = 2 moles of [tex]NH_3[/tex]

Thus 107.1 moles of [tex]H_2[/tex] give =[tex]\frac{2}{3}\times 107.1=71.4moles[/tex]  of [tex]NH_3[/tex]

Volume of [tex]NH_3=moles\times {\text {Molar volume}}=71.4moles\times 22.4L/mol=1600L[/tex]

Thus volume of ammonia produced is 1600 L

Answer: self-actualization (C)

Explanation:

it’s at the top of the hierarchy of needs.

1. In preparing his speech for a youth association, Eric considers the demographics and other important information about the people who will be listening to him speak. Like all successful speakers, Eric is engaging in the process of

C. Analyzing the audience

2. To gather formal information about audience members' attitudes, beliefs, and values, you can

D. ask open-ended and closed ended question on a survey

3. Debbie planned a speech calling for higher student fees. She thought about how her audience might react to this message. She prepared a survey and asked a group of her classmates to take it. What kind of audience analysis did Debbie use?

C. Formal

4. Why is audience analysis important?

A. It helps you understand the audience as much as possible before giving your speech

5. The audience's educational level is a factor related to

B. demographics

6. A speaker that collects information about the audience, evaluates what has been collected, and adapts his or her speech using that information is considered a(n) _____ speaker

B. Audience-centered

7. Maslow refers to the stage where one reaches his or her full developmental potential as

C. self-actualization

8. Which of the following is a method of collecting informal data about your audience?
D. observing the audience

9. Sara is preparing a speech to endorse a political candidate. She uses the information she gathered about her audience to determine their vales, beliefs, and attitudes so she can better prepare her speech. Sara is conducting which type of analysis?

A. Psychographic analysis

10. As you learn more about the audience, you are able to identify the beliefs, values, and attitudes of the audience. This is known as

B. Psychographics

I hope this helps!

Answer:

The electromagnetic spectrum

Explanation:

ranges from gamma (γ) radiation, which has the shortest wavelength, highest frequency, and greatest energy

Answer: The molecular formula will be [tex]C_3H_9[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

The empirical formula is [tex]CH_3[/tex]

The empirical weight of [tex]CH_3[/tex] = 1(12)+3(1)= 15g.

The molecular weight = 45.0 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{45}{15}=3[/tex]

The molecular formula will be=[tex]3\times CH_3=C_3H_9[/tex]

Thus molecular formula will be [tex]C_3H_9[/tex]

Answer:

c. (NH4)3PO4

Explanation:

Answer:

c is the right answer

Explanation:

as we know ammonium is NH4

AND PHOSPHATE IS PO4-3

SO WHEN WE MIX THEM THEY BECOME

(NH4)3PO4

Answer 1- 233.07

Answer 2- 491.07

Answer 3 - 6.05

Answer 4 - 28.02

Choose the products that complete the reaction. The chemical equation may not be balanced.

NaHCO3 + HC2H3O2

Answer: NaC2H3O2 + CO2 + H2O

Answer:

91.4

Explanation:

Givens

d = 8.96

v = 10.2 cm^3

m =?

Formula

d = m / V

Solution

8.96 = m / 10.2               Multiply both sides by 10.2

8.96 * 10.2 = m

m = 91.392 grams

m = 91.4 grams rounded.

Answer:

Genetics is the scientific study of inherited variation. Human genetics, then, is the scientific study of inherited human variation.

Why study human genetics? One reason is simply an interest in better understanding ourselves. As a branch of genetics, human genetics concerns itself with what most of us consider to be the most interesting species on earth

Answer:

[SO2Cl2] = = 0.015 M [SO2] = = 0.0027 M [Cl2] = = 0.0027 M Q = =   = 4.8 × 10−4

No. Q < Kc, so reaction will shift to the right.

Explanation:

Answer:

give it your all but know your limits

Explanation:

Answer:

Decomposition

Explanation:

This shows a compound splitting into two

By definition, PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.

First, you have to know that in a decomposition reaction, a single substance decomposes, producing two or more different substances. That is, in this type of reaction, two or more substances are formed from a compound.

The atoms that make up a compound are separated to give the products according to the formula:

AB → A + B

This type of reaction can occur spontaneously or caused by certain external factors, such as heat, which promote the decomposition of the molecule into simpler substances.

In this case, it is possible to observe that PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.

Learn more:

Answer:

option D is correct answer of this question

V₂=0.894 L

Given

V₁=1.55 L

T₁=27 + 273 = 300 K

P₁=1 atm

T₂=-100+273 = 173 K

Required

The final volume(V₂)

Solution

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

Input the value :

V₂=V₁T₂/T₁

V₂=1.55 x 173/300

V₂=0.894 L

Answer:

i think its changing shape if I'm wrong I'm sorry

Answer:

B

Explanation:

Decreasing the sample size of the liquid

hope it helps!