I need someone to help with the bonus.

Answer:

The cube

Explanation:

When the cube is put on the triple beam balance it gives the mass of 429.3

Answer:

Mitosis meiosis

Explain:

Mitosis is where the cell splits into 2 more cells (diploid)

Meiosis is where the cell splits into 2, and then split again, making 4 (haploid)

Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas.

So I think you should go with the 3rd option.

Hope this was helpful.

Answer:

What the other guy said

Explanation:

Answer:

The sample which would contain more oxygen atoms is a glass stirring rod.

Explanation:

According to the periodic table ,

the glass stirring rod is Silicon dioxide and the cotton ball is cellulose

Here , the molar mass of the glass stirring rod [tex]SiO_{2}[/tex] = 60.08 Grams/mole

Molar mass  of the cotton ball  [tex]C_{6} H_{10}O_{5}[/tex] = 162.09 gram/mole .

since ,total number of molecules present in oxygen is 32 ,

therefore ,

In glass stirring rod ,

number of oxygen atoms present in 5g = [tex]\frac{32}{60.07} \times 5[/tex]

                                                                 = 2.66 g of oxygen

                                                              [tex]\frac{1}{16} \times 2.66[/tex]

                                                           =  0.16625 moles

                                                      = 0.16625 x [tex]6.023\times 10^{23}[/tex]

                                                   =[tex]1.001 \times10^{23}[/tex] atoms

In cotton ball ,

number of oxygen atoms present in 5g = [tex]\frac{80}{162.09} \times 5[/tex]

                                                                = 2.467 g of oxygen

                                                              [tex]\frac{1}{16} \times 2.467[/tex]

                                                           = 0.15418 moles

                                                            = 0.15418 [tex]\times 6.023 \times 10^{23}[/tex]

                                                           = 0.928 [tex]\\ \times10^{23}[/tex]

Hence , the glass stirring rod contains more number of oxygen atoms .

Answer: a responsibilty

Explanation:

An obligation to do something or control over or care for someone. ​The word suitable for it is "responsibility".

An obligation is a duty or responsibility to do anything that is required by law, custom, or moral standards.

Responsibility is an obligation to do something or control over or care for someone. It is a duty or task that one is required to undertake.

Responsibility can be of different forms, such as personal, social, or professional.

Personal responsibility refers to the responsibility that an individual has for their own actions and decisions.

Social responsibility refers to the responsibility that an individual or organization has to act in the best interest of society.

Professional responsibility refers to the responsibility that individuals have to perform their job duties to the best of their ability.

Therefore, the term most suits for the given statement is "responsibility".

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Answer:

Explanation:

Given 2H₃PO₄ + 3Ca ⇒ 3H₂ + Ca₃(PO₄)₂

          27.4g

       =(27.4g/98g/mol)

       = 0.280 mole H₃PO₄ used

Ca Used:

Rxn Ratio H₃PO₄ : Ca => 2:3

∴ moles Ca used = 3/2(0.280) mole Ca =0.420 mole Ca

grams Ca used = 0.420 mole Ca x 40 g/mole = 16.8 grams Ca used

Grams H₂ Produced:

Rxn Ratio H₃PO₄ : H₂ => 2:3 => moles H₂ produced = 3/2(0.28 mole H₂) = 0.420 mole H₂ = (0.420 mole H₂ x 2.02 g/mole) = 0.8484 grams H₂(g) Produced.

Moles Ca₃(PO₄)₂ Produced:

FWt Ca₃(PO₄)₂ = 310 g/mole

Rxn Ratio H₃PO₄ : Ca₃(PO₄)₂  => 2:1

∴moles Ca₃(PO₄)₂ Produced = 1/2(moles H₃PO₄ used)

= 1/2(0.28 mole) = 0.14 mole Ca₃(PO₄)₂  

If you want grams Ca₃(PO₄)₂, multiply moles Ca₃(PO₄)₂ by formula weight.

Answer:

Percentage mass of copper in the sample = 32%

Explanation:

Equation of the reaction producing Cu(NO₃) is given below:

Cu(s)+ 4HNO₃(aq) ---> Cu(NO₃)(aq) + 2NO₂(g) + 2H₂O(l)

From the equation of reaction, 1 mole of Cu(NO₃) is produced from 1 mole of copper. Therefore, 0.010 moles of Cu(NO₃) will be produced from 0.010 mole of copper.

Molar mass of copper = 64 g/mol

mass of copper = number of moles * molar mass

mass of copper = 0.01 mol * 64 g/mol = 0.64 g

Percentage by mass of copper in the 2.00 g sample = (0.64/2.00) * 100%

Percentage mass of copper in the sample = 32%

Valence electrons are electrons that are in the outermost orbitals of an atom. In the periodic table the elements are divided into groups. All elements of the first main group have one valence electron. All elements of the second main group have two valence electrons. And so on:

Answer:B

Explanation:

Answer:

I think it's D. Please let me know if it's wrong or right.

Explanation:

Answer:

helium

The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

Answer:

Option A. 250 mL

Explanation:

From the question given above, the following data were obtained:

Molarity of NaCl = 3 M

Mass of NaCl = 43.83 g

Volume of water =..?

Next, we shall determine the number of mole in 43.83 g of NaCl. This can be obtained as follow:

Mass of NaCl = 43.83 g

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Mole of NaCl =?

Mole = mass/molar mass

Mole of NaCl = 43.83/58.5

Mole of NaCl = 0.749 mole

Next, we shall determine the volume of water required to prepare the solution as follow:

Mole of NaCl = 0.749 mole

Molarity of NaCl = 3 M

Volume of water =..?

Molarity = mole /Volume

3 = 0.749 /volume

Cross multiply

3 × volume = 0.749

Divide both side by 3

Volume = 0.749/3

Volume = 0.25 L

Finally, we shall convert 0.25 L to millilitres (mL). This can be obtained as follow:

Recall:

1 L = 1000 mL

Therefore,

0.25 L = 0.25 L × 1000 mL / 1 L

0.25 L = 250 mL

Therefore, 0.25 L is equivalent to 250 mL.

Thus, the volume of water needed to prepare the solution is 250 mL

Answer:

dinosaur footprint

Explanation:

dinosaur footprint because the deffinition of trace fossil is a fossil of a foot print

Answer: Dinosaur footprint should be correct!

Explanation: As in the name, trace footprints are practically just traces, so a Dino print is a perfect example! The dinosaur left a trace, leaving evidence about it, for science to study:) please let me know if this helps! :)

Answer:

Yes

Explanation:

It was Dmitri Mendeleev, a Russian chemist and teacher.

Answer:

No, it wasn't. On Feb.17 in 1869, a very intelligent Russian professor of chemistry, Dimitri Ivanovich Mendeleev created his first part of the periodic table. I hope that helps you.

Explanation:

Answer:

Explanation:

Thank you ☺️☺️

Answer:

1:MgCO3 (s) + 2 NaNO3

2:agcl(s)+kno3(aq)

3:alcl3(aq)+h2(g)

4:NaNO3 + CO2 + H2O

(not sure abt last one)

Answer:

Number of moles of C produced =  58.08 mol

Explanation:

Given data:

Mass of sugar = 1745 g

Moles of C produced = ?

Solution:

Chemical equation:

C₆H₁₂O₆  +   6H₂SO₄    →     6C + 6(H₂SO₄.H₂O)

Number of moles of sugar:

Number of moles = mass/molar mass

Number of moles = 1745 g/180.16 g/mol

Number of moles = 9.68 mol

Now we will compare the moles of C and sugar.

                 C₆H₁₂O₆          :           C

                      1                  :           6

                    9.68              :          6×9.68 = 58.08 mol

Number of moles of C produced =  58.08 mol

Answer:

[tex]2,092,000J[/tex]

Explanation:

Hello.

In this case, we need to perform a unit conversion problem between cal and joule, taking into account that 1 cal equals 4.184 joules of energy, therefore, we write the following proportional factor:

[tex]500,000cal*\frac{4.184J}{1cal}[/tex]

Whereas the 1 cal is written under the line in order to simplify the initial can and the 4.184 J on the line as joules are the required units. Thus, we obtain:

[tex]2,092,000J[/tex]

As the energy required to burn off such amount of energy given of potato chips.

Best regards.

Answer:

:)

Explanation:

The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.

According to the electronic configuration of boron, there are three electrons in the Bohr model of a boron atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

it would be an element because its an element

Explanation:

Answer:

V= in square root 2KE/M=2(143.3J)/0.047kg=6097.8723 in square root around 78.1 approxmete

Kinetic energy is directly proportional to the mass and square of speed of a moving body. Here, the speed of the body of mass 47 g or 0.47 kg with akinetic energy of 143.3 J is 24.6 m/s.

Kinetic energy is a generated by virtue of motion of a body. It is half of the product of mass and square of velocity. Thus as mass is increase kinetic energy also increases.

If velocity is doubled then kinetic energy increases 4 times. Since velocity or speed is in square in the equation written as follows:

KE = 1/2 mv² . Here, m is the mass and v be the speed.

Here, kinetic energy is given 143.3 J and mass of the moving body is 0.47 kg and speed can be calculated by rearranging the equation as follows:

[tex]v = \sqrt{\frac{KE \times 2 }{m } \\\\\\ = \sqrt{\frac{43.3 J \times 2}{0.47 kg} \\\\\\\\\\\\\\ = 24.6 m/s[/tex]

Hence, the speed of the body of mass 47 g or 0.47 kg with akinetic energy of 143.3 J is 24.6 m/s.

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Answer:

d = 0.057 g/mL

Explanation:

Given that,

The dimensions of a rectangular metal is 25 dm long, 525 mm wide, and 1.5 m high.

The weight of the metal is 250 lb

We need to find the density of the metal in g/mL.

1 lb = 453.592 g

250 lb = 113398 g

Volume of the block,

V = 25 dm× 525 mm×1.5 m

Since, 1 dm = 0.1 m, 1mm = 0.001 m

V = 2.5 m× 0.525 m× 1.5 m

V = 1.9668 m³

Also, 1 m³ = 1968000 mL

So,

density = mass/volume

density = 113398 g/1968000 mL

= 0.057 g/mL

So, the density of a rectangular metal is 0.057 g/mL.

Answer:

catalase

Explanation:

catalase is enzime the rest are glucides