Calculate the mass of chromium produced from 5 tonnes of Cr2O3-

Answer:

CH4

Explanation:

Answer:

37.64 × 10²³ atoms

Explanation:

Given data:

Number of atoms = ?

Mass of sulfur = 200.0 g

Solution:

First of all we will calculate the number of moles of sulfur.

Number of moles = mass/molar mass

Number of moles = 200.0 g/ 32 g/mol

Number of moles = 6.25 mol

Number of atoms:

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

6.25 mol × 6.022 × 10²³ atoms / 1mol

37.64 × 10²³ atoms

Answer:

24 g of oxygen

Explanation:

The equations means that four moles of CH3NO2 reacts with three moles of oxygen to yield for moles of carbon dioxide, two moles of nitrogen gas and six moles of water.

The balanced equation of the reaction is;

4CH3NO2 + 3O2 -----> 4CO2 + 2N2 + 6H2O

Molar mass of CH3NO2 = 61 g/mol

61 g of methyl nitrate contains 61 g/ 61 g/mol = 1 mole of CH3NO2

From the balanced reaction equation;

4 moles of CH3NO2 reacts with 3 moles of oxygen

1 mole of moles of CH3NO2  reacts with 1 * 3/4 = 0.75 moles of oxygen gas

0.75 moles of oxygen gas * 32 g/mol = 24 g of oxygen

Answer:

B. Warm year round with lots of precipitation

Explanation:

GIVEN

Answer:

A. 1, 1, 1, 1

B.1,1,1

C. 2, 1, 2, 1

D. 2, 1, 1, 1

E.1,2,1,1

F.1, 1, 1, 2

G. 1, 6, 3, 4

H. 2, 3, 2, 3

Answer: B

Explanation: A fluorine atom has nine protons and nine electrons, so it is electrically neutral. (neutral =0)

The nucleus of a fluorine atom has a charge of zero as the atom has equal number of positive and negative charges.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

A barium atom would be expected to contain 2 electrons in its outer energy level.

Explanation:

The columns of the periodic table are called groups. There are eighteen groups, numbered from 1 to 18.

The elements of each group have the same number of electrons in their last atomic shell, which is why they have similar chemical properties, because the chemical properties of chemical elements are strongly related to the electrons located in the last atomic shell.

That is, in a group, the chemical properties are very similar, because all the elements of the group have the same number of electrons in their last or last shells.

A barium atom would be expected to contain 2 electrons in its outer energy level.

Answer:

Do you still need help?????????

Answer:

Reactant

Explanation:

B

Answer:

i belive that it is an elemnt

Explanation:

The empirical formula is the same as the molecular formula : C₁₀H₅O₂

Given

Molecular formula : C₁₀H₅O₂

Required

The empirical formula

Solution

The empirical formula (EF) is the smallest comparison of atoms of compound forming elements.  

The molecular formula (MF) is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

(EF)n=MF

(EF)n = C₁₀H₅O₂

If we divide by the number of moles of Oxygen (the smallest) which is 2 then the moles of Hydrogen will be a decimal number (not whole), which is 2.5, then the empirical formula is the same as the molecular formula

Answer- im pretty sure it's 2

Answer:

From my side the correct option is "A"

Explanation:    Reasons for its correction are ,

1)  Highly reactive: Nanoparticles are therefore extremely unstable and easily change themselves or react with active substances to reach a relatively stable state in some cases. This causes desired changes or undesired changes to nanoparticles and thus makes them exhibit a high reactivity and a poor stability.

2)Small size:  Nanotechnology can provide rapid and sensitive detection of cancer-related molecules, enabling scientists to detect molecular changes even when they occur only in a small percentage of cells. Nanotechnology also has the potential to generate entirely novel and highly effective therapeutic agents.

Mass of sucrose : = 41.076 g

Given

50 ml sample of a  2.4 M sucrose solution(C₁₂H₂₂O₁₁)

Required

Mass of sugar

Solution

Mol sucrose :

= M(molarity) x V(volume)

= 2.4 x 50

= 120 mlmol

= 0.12 mol

Mass of sugar :

= mol x MW

= 0.12 x 342,3 g/mol

= 41.076 g

Answer:

Its obviously 2 or 3 and since 2 isn't a method its 3

Explanation:

There you have it

To solve this we must be knowing each and every concept related to planet. Therefore, the correct option is option C among all the given options.

A planet must accomplish three things: circle a star, be large sufficient to have sufficient gravity to compel a spherical form, and be large sufficient that its gravity swept away any similar-sized objects near its orbit.

Our solar system's planets did not arise out of nothing. The sun didn't either. They were all engulfed in a massive gas and dust cloud. Gravity gathered a lot of material inside the center to form the sun.

Astronomers send probes to other planets to take pictures of their surfaces. An astronomer thinks that briny water flows on Mars because he noticed certain features in one picture of Mars. Analyzing a natural experiment is a method to form this hypothesis.

Therefore, the correct option is option C.

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Answer:

Neucler fission is ​a radioactive decay process. The nucleus of an atom splits into two.

Answer:

infinite yield

fortmatting clear and easy to udnerstnadx

Explanation:

90.5 g inf ytield

Answer: The water cycle is condensation, precipitation, evaporation, and transpiration. The rock cycle and water cycle overlap with erosion, transporting, and deposition.

There are various cycle in nature like water cycle, nitrogen cycle,  rock cycle.  In terms of cycling, water cycle and rock cycle are similar but in terms of steps these are different.

Biological cycle is a cycle in which recycling of element or compound take place in nature. It is circulation of a substance to its original form. It is rhythmic repetition of biological phenomena in associations of organisms. It involves multiple process.

There are various steps in water cycle like condensation, precipitation, evaporation, and transpiration while the process in rock cycle is erosion, transporting, and deposition.

Therefore in terms of cycling water cycle and rock cycle are similar but in terms of steps these are different

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Answer: Reactant

Explanation:

In simple wording, Water act as a reactant and it broke or we can say split the larger molecule in the smaller ones, The H and OH bonds are attached to the two products that are formed after the reaction. Another process in which water is used as an important reactant is photosynthesis.

Answer:

you r correct it is layer a and b

Explanation:

Answer:

HOLY WOAH

Explanation:

YES

Answer:

The rock cycle describes the processes through which the three main rock types (igneous metamorphic, and sedimentary) transform from one type into another.

Answer: 60 C

Explanation:

Answer:

Hi there, The correct answer is, OPT A

Explanation:

Please mark as the brainliest

Answer:1. Introduction

The main air pollutants are represented by gases forms, particles in suspension, different ionizing radiation and noise.

The gases forms are: oxidized and reduced forms of carbon (CO2, CO, CH4), of nitrogen (NO2, NO, N2O4, NH3, NH4+), SO2, O3, C6H6 vapours, Hg, volatile phenols, Cl2, etc.

The particulate forms are: PM10 and PM2.5 particulate matter, heavy metals with toxic effect (Pb, Ni, Cd, As), polycyclic aromatic hydrocarbons PAHs, etc.

Atmospheric pollutants have a negative effect on the plants; they can have direct toxic effects, or indirectly by changing soil pH followed by solubilization of toxic salts of metals like aluminum. The particulate matters have a negative mechanical effect. They cover the leaf blade reducing light penetration and blocking the opening of stomata. These impediments influence strongly the process of photosynthesis which rate declines sharply.

Explanation:

Answer:

A More air pollution because there are fewer trees to take in carbon dioxide

C Fewer birds and other wildlife because they have fewer places to live

Explanation:

I took the test on A P E X

Answer:

LiOH+CH3COOH=C2H3LiO2+H2O balanced equation

Explanation:

lithium hydroxide-> LiOH

hydrogen acetate->CH3COOH

lithium acetate->C2H3LiO2

water->H2O

LiOH+CH3COOH=C2H3LiO2+H2O

Li=1,O=3,H=5,C=2 --> Li=1,O=3,H=5,C=2

the two sides have same numbers so it is balanced.

Answer:

Explanation:

Solution required is .15 M 500 mL sodium fluoride .

molecular weight of sodium fluoride = 42

one mole of sodium fluoride = 42 grams

No of moles contained in the solution of .15M , 500 mL solution

= .15 x 0.5 moles = .075 moles

1 mole = 42 g

.075 moles = .075 x 42 = 3.15 grams .

So mass of sodium fluoride required = 3.15 g .

The basic principle of the number of elements in reactants and products is the same used in balancing chemical equations

Given

The chemical equation

Required

The balanced equation

Solution

Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:  

• 1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.  

• 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product  

• 3. Select the coefficient of the substance with the most complex chemical formula equal to 1

We give an example for reaction number 1:

aAl + bHCl → AlCl₃ + cH₂

Al, left = a, right = 1⇒a=1

Cl, left = b, right = 3⇒b=3

H, left = b, right = 2c⇒b=2c⇒3=2c⇒c=3/2

The equation becomes :

Al + 3HCl → AlCl₃ + 3/2H₂ x2

2Al + 6HCl → 2AlCl₃ + 3H₂

The steps are the same for the other reactions

2. 2Al + 3S → Al₂S₃

3. 4NO₂ + O₂ → 2N₂O₅

4. 4Al + 3O₂ → 2Al₂O₃

5. Ba(ClO₃)₂ → BaCl₂ + 3O₂

Answer:

A) Glass

Explanation:

Glass is a conductor, so it allows heat to go through it (Ex. Touching a pie pan that came right out of the oven)

Rubber is an insulator, so heat has a hard time passing through (Ex. Using a rubber grip on a cast iron pan.

Cloth is also an insulator, so heat has a hard time passing through (Ex. Using a pot holder to prevent the counter from getting scarred)

Wood is also an insulator, so heat has a hard time passing through (Ex. Bedding for a rabbit hutch)

Hope this helps!!