How is the density of an object calculated?

Dividing the object’s volume by its mass
Multiplying the object’s mass and volume
Multiplying the object’s volume and weight
Dividing the object’s mass by its volume

Answer:

Atoms consist of at least some negatively charged particles (Electron)

Explanation:

J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.

Please correct me if I'm wrong.

In this reaction, 3 moles of CO2 would be produced when methane (CHA) fully reacts with 6 moles of Oz.

Methane is an odorless, colorless, flammable gas. Its miles are used ordinarily as gasoline to make heat and light. it is also used to fabricate natural chemicals. Methane can be fashioned by way of the decay of natural substances and is common in landfills, marshes, septic structures, and sewers.

High tiers of methane can lessen the quantity of oxygen breathed from the air. this can result in temper changes, slurred speech, vision problems, memory loss, nausea, vomiting, facial flushing, and headache. In excessive cases, there can be changes in respiratory and coronary heart fee, balance problems, numbness, and unconsciousness.

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Answer:

100.985

Explanation:

Answer:

srry, I don't understand, I would need more info

Answer:

1.93 (rounded to nearest .00)

Explanation:

[tex]\frac{M}{V}[/tex]  (mass divided by volume)

Answer:

The correct answer is Molten

Explanation: The proof is in the attachment below, the answer is correct on the quiz I took

The term molten describes the materials magma is made up. Thus, option B is correct.

Silver is a shiny metal that conducts electricity very well . It can be molded into thin sheets it means it can spread into a like a sheet and these type of properties is known as malleability.

Potassium is dull and brittle it means that it can't be change into sheet when you try to change in sheet it will break and these properties are called as brittlness and when it is has been dissolved into water, which it does quite easily. Physical properties of matter include color, hardness, malleability, solubility, electrical conductivity, density, melting points and boiling points.

Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6. The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .

Therefore,the term molten describes the materials magma is made up. Thus, option B is correct.

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Answer:

C

Explanation:

Answer:

D

Explanation:

Not a because the term exo means outward, so exothermic means releasing energy so D.

Not B or C because they have nothing to do with exothermic (exo- outward thermic- energy)

Answer:

1.An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers ( 1 × 10−10 m, a ten-millionth of a millimeter, or 1/254,000,000 of an inch).

3.New elements aren't exactly discovered anymore. However, they can be made, using particle accelerators and nuclear reactions. A new element is made by adding a proton (or more than one) to a pre-existing element. This can be done by smashing protons into atoms or by colliding atoms with each other.

4.If an atom gains an electron, it becomes negatively charged.

If an atom loses an electron, it becomes positively charged.

Answer:

Absorbed during the above reaction.

Explanation:

It is lowering the temperature of the reaction mixture, and thus the reaction flask feels cold.

Answer:

Endothermic reaction: absorbs heat from its surroundings.

Explanation:

"Endo" means inside.  "Thermic" refers to heat.

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass of metal = 31.5 g

density = 10.49 g/cm³

We have

[tex]density = \frac{31.5}{10.49} \\ = 3.002859866...[/tex]

We have the final answer as

Hope this helps you

Answer:

A = 74 g

Explanation:

Given data:

Ma-74 (74.333 - 85%)

Ma-75 (74.999 - 10%)

Ma-76 (75.700 - 5%)

Atomic mass close to = ?

Solution:

1st of all we will calculate the average atomic mass.

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass  = (85×74.333)+(10×74.999)+(5×75.700) /100

Average atomic mass =  6318.305 +749.99+ 378.5 / 100

Average atomic mass= 7446.795/ 100

Average atomic mass = 74.467 amu

The average atomic mass is closer to the 74 g.

Answer:

Proposed a periodic table that accommodated for the discovery of new elements, Dmitri Mendeleev

Proposed a triad arrangement based on the elements’ physical and chemical similarities Johann Döbereiner

Proposed a periodic table based in the repeating properties of the elements like an octave in music. John Newlands

Proper a periodic table based on the increasing order of the elements atomic numbers. Henry Moseley

Explanation: I did the same thing

Answer:

The first one is:Dmitri Mendeleev

second one is:Johann Döbereiner

third one is:John Newland

fourth one is:Henry Moseley

Answer:

c.filtration is the answer

Explanation:

Carbon-12 (12C) is the more abundant of the two stable isotopes of carbon (carbon-13 being the other), amounting to 98.93% of the element carbon;[1] its abundance is due to the triple-alpha process by which it is created in stars. Carbon-12 is of particular importance in its use as the standard from which atomic masses of all nuclides are measured, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12 is composed of 6 protons, 6 neutrons, and 6 electrons.

Answer:

C) the tin one

Explanation:

because its the same substance, it was just heated and formed into a new shape.

Answer:

Hydrogen, symbol H, has 1 valence electron, Lewis structure is H. Helium, symbol He, has 2 valence electrons, Lewis structure is He: With helium, the first energy level (K shell) is full.

The Lewis dot structure for He has been shown in the image attached.

The general shape of a molecule and the number of bonds an atom can make can both be determined using Lewis structures. They provide a visual representation that aids in understanding chemical bonding and predicting the reactivity and other properties of molecules.

The three-dimensional form of molecules, molecular orbitals, or the presence of lone pairs of electrons are all ignored in Lewis structures, which are simplified models. Making this distinction is essential.

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Answer:

A

Explanation:

Answer:

1. Find the molar mass of NO2 (46.01)

2. Find the number of moles in 25 g of NO2 (by dividing 25 by the molar mass)     25/46.01 = .54

3. For every 3 moles of NO2 there are 2 moles of HNO3. multiply the number of moles of NO2 by 2/3

.54 x 2/3 = .36

4. Finally, multiply this number by the molar mass of HNO3 (63.018)

.36 x 63.018 = 22.68 g HNO3

Explanation:

The statement, that describes the mass of HNO₃ can be made from mass of NO₂ is "17.1 gram".

A substance is something to do with mass that takes up space. The mass of a compound is the total amount of atoms present in grams that make up a molecule. The grams is the unit of mass. In order to determine the mass in grams, divide the given mass of the substance value by its molar mass to convert gram into mole.

The mass about one cubic centimeter of distilled water at 4°C would be used to describe the gram as a unit.

Gram to mole conversion factor,

[tex]= grams\;*\;\frac{1\;mol}{grams}[/tex]

The balanced chemical equation comes out to be, 2NO₂ + H₂O → HNO₂ + HNO₃

Using the above equation, the moles of NO₂ can be determined from the given mass,

[tex]= \frac{given\;mass}{molar\;mass}\\= 25.0\;g\;*\;\frac{1\;mol}{46.005\;g} \\= 0.5434\;mol Now, HNO_{3} can be made from 25.0 g of NO2= 0.5434\;mol\;NO2\;*\;\frac{1\;mol\;HNO3}{2\;mol\;NO2}\;*\;\frac{63.01\;g\;HNO3}{1\;mol\;HNO3} \\= 17.119\;g\;HNO3\\=17.1\;g\;HNO3[/tex]

Hence the correct answer is 17.1 gram.

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Answer:

C

Explanation:

Because you can't open your lamps when there's no electricity or if it's brownout,,,,

Answer:

should be 107.8682u

Explanation:

Answer:

C. 107.87 g/mol

Explanation:

I got it right

Answer:

Graphing data can help you to recognize changes in what your doing.

Explanation:

Answer:

Explanation:

To identify trends, make predictions, and recognize anomalous data. Helps you understand what your data means or a picture of your graph. A graph wich the points form a straight line.

Answer:

chlorine

Explanation:

Because chlorine is in the same period as phosphorus and sodium, but has the most protons in its shell (the most right within the same period) it has the greatest effective nuclear charge.

Answer:

6

Explanation:

All noble gases are nonreactive, these include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Answer:

18 elements are nonreactive in the periodic table

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 10 g

volume = 2 cm³

We have

[tex]density = \frac{10}{5} \\ [/tex]

We have the final answer as

Hope this helps you