Does anyone know this ?Please I need help

Answer:

1. In a chemical reaction, the atoms and molecules that interact with each other are called reactants. ... No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

2. Given below are some of the examples of the chemical reactions in our daily life:

Photosynthesis.

Combustion.

Aerobic cellular respiration.

Anaerobic respiration including the process fermentation.

Metathesis reactions, for example, vinegar and baking soda.

Oxidation which includes rusting.

Digestion.

3. A chemical formula is the combination of atomic symbols that designate a particular chemical compound, or a substance with two or more different elements. ... A chemical equation shows one or more chemical compounds (reactants) being converted into different chemical species called products.

Answer:

yes

Explanation:

The correct equation for the decomposition of copper carbonate is:

CuCO3 → CuO + CO2

Br- + 2MnO4- + 2H+ → BrO3- + 2MnO2 + H2O

Given

MnO4- + Br- = MnO2 + BrO3-

Required

The half-reaction

Solution

In acidic conditions :

1. Add the coefficient

2. Equalization O atoms (add H₂O) on the O-deficient side.  

3. Equalization H atoms (add H⁺ ) on the H -deficient side.  .  

4. Equalization of charge (add electrons (e) )

5. Equalizing the number of electrons and then adding the two half -reactions together

Oxidation : Br- → BrO3-  

Reduction : MnO4- → MnO2

Br- + 3H2O → BrO3-  

MnO4- → MnO2 + 2H2O

Br- + 3H2O → BrO3- + 6H+  

MnO4- + 4H+ → MnO2 + 2H2O

Br- + 3H2O → BrO3- + 6H+ + 6e-         x1

MnO4- + 4H+ + 3e- → MnO2 + 2H2O x2

Br- + 3H2O → BrO3- + 6H+ + 6e-  

2MnO4- + 8H+ + 6e- → 2MnO2 + 4H2O

Br- + 2MnO4- + 3H2O + 8H+ + 6e- → BrO3- + 2MnO2 + 6H+ + 4H2O + 6e-

Br- + 2MnO4- + 2H+ → BrO3- + 2MnO2 + H2O

Answer:

C) Lipids and Carbohydrates

Explanation:

Lipids, or fats, are stored long-term for energy when an organism cannot find carbohydrates (specifically glucose), which are used as short-term energy.

Answer:

[tex]0.75\ \text{M}[/tex]

Explanation:

[tex]C_1[/tex] = Concentration of [tex]Na_2CO_3[/tex]

[tex]C_2[/tex] = Concentration of [tex]HCl[/tex] = 1 M

[tex]V_1[/tex] = Volume of [tex]Na_2CO_3[/tex] = 20 mL

[tex]V_2[/tex] = Volume of [tex]HCl[/tex] = 15 mL

We have the relation

[tex]V_1C_1=V_2C_2\\\Rightarrow C_1=\dfrac{V_2C_2}{V_1}\\\Rightarrow C_1=\dfrac{15\times 1}{20}\\\Rightarrow C_1=0.75\ \text{M}[/tex]

The concentration of [tex]Na_2CO_3[/tex] is [tex]0.75\ \text{M}[/tex].

Answer:

Sunlight penetrates the top layers of the ocean, so photosynthesis occurs there. ... Upwelling brings nutrients to the surface.

1.Oort Cloud

2.Uranus Earth and Mars

3.Kuiper Belt

4.Asteroid Belt

Answer:

last one

Explanation:

Answer:

full moon

hope this helps

Answer:

binary and 11

Explanation:

CaCl2 or Calcium Chloride is an ionic bond and not a covalent bond. Since there should be sharing of electrons between two atoms to be a covalent bonding. In case of calcium chloride, the calcium gives up an electron to each chlorine atom, becoming Ca2+ ions and chlorine become Cl– ions.

:)

Answer:

Because the particles are in motion, they will have kinetic energy. The particles will not all have the same energy, and the energy of the particles is constantly changing as they undergo changes in speed. Thus, for a given sample of matter, we can only talk about the average kinetic energy of the particles.

Explanation:

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We do know that if we "give" energy to a given object, the temperature of the object increases.

So there is a direct relationship between temperature and energy.

From this idea, we can conclude that:

"As we increase the energy, we also will see an increase in molecular motion."

We also do know that, as the temperature of an object increases, also does the kinetic energy of the particles that conform to the object (as the kinetic energy increases, the particles move more, this is why as we increase the temperature we usually see an increase in the volume of the object).

This increase in kinetic energy is related to the molecular motion (the movement of the electrons and nucleus o a molecule) as the kinetic energy of these parts increase, these move more.

So the relationship between molecular motion and energy is:

As we increase the energy, we also will see an increase in molecular motion.

If you want to learn more, you can read:

https://brainly.com/question/12280673

Answer: [tex]8.38\times 10^{23}atoms[/tex] of carbon

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.

mass of sugar= [tex]density\times volume=1.59g/ml\times 25ml=39.75g[/tex]

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{39.75g}{342.3g/mol}=0.116moles[/tex]

1 mole of sugar [tex]C_{12}H_{22}O_{11})[/tex] contains = [tex]12\times 6.023\times 10^{23}=72.28\times 10^{23}atoms[/tex] of carbon

0.116 mole of sugar [tex]C_{12}H_{22}O_{11})[/tex] contains = [tex]\frac{72.28\times 10^{23}}{1}\times 0.116=8.38\times 10^{23}atoms[/tex] of carbon

Answer:

Calcium iron oxide (CaFe2O4)

PubChem CID 6336546

Molecular Formula CaFe2H8O4

Synonyms Calcium iron oxide (CaFe2O4) 12013-33-1 Calcium ferrite EINECS 234-584-5

Molecular Weight 223.83 g/mol

Component Compounds CID 23925 (Fe) CID 5460341 (Calcium) CID 962 (Water)

Answer:

primary consumers and sometimes plants

Answer:

Explanation:

Answer:

b

Explanation:the shell is 2 so ignore the 1s electrons it is only the level 2 electrons that are valence

Answer:

Dominos prank call hahahaha

Answer:

why

Explanation:

Answer:

Heat Capacity = E / T.

- Find the difference in temperature for changes of multiple degrees.

- Add the appropriate units to your answer to give it meaning.

- Know that this equation works for cooling objects as well.

- Know that specific heat refers to the energy needed to raise one gram by one degree.

Answer:Two

Explanation:

Answer: 0.74 moles

Explanation:

The first step is to figure out the chemical formula for calcium phosphate. Since we know that calcium is a metal, this will be an ionic bond. Calcium is written as Ca and has a charge of +2. Phosphate is written as PO4 with a charge of -3. To come up with the subscripts for this formula, cross the charges. That means that you will get [tex]Ca_{3} (PO_{4} )_{2}[/tex].

Next, calculate how many grams one molecule of calcium is. Calcium has an atomic weight of 40, and there are 3 molecules of calcium, so 40 x 3 = 120. Phosphorus has an atomic weight of 31, and there are 2 molecules of phosphorus, so 31 x 2 = 62. Oxygen has an atomic weight of 16, and there are 8 molecules of oxygen, so 16 x 8 = 128. Adding all of those together gives you 310 g.

Now, using stoichiometry, we can figure out the question. We know that there are 230 grams. We also know that one mole weighs 310 g. If you divide 230 by 310, you will get your answer, which is 0.74 moles.

Answer:

A partial lunar eclipse occurs when only a portion of the Moon enters Earth's umbra, while a total lunar eclipse occurs when the entire Moon enters the planet's umbra.

Answer:

natural selection

Explanation:

Answer:

Number of Fe atoms = 2.709 × 10^23 atoms.

Explanation:

Given the following data;

Number of Fe moles = 0.450 mole

We know that Avogadro constant is equal to 6.02 * 10^23 mol¯¹

Number of Fe atoms = number of Fe moles * Avogadro constant

Substituting into the equation, we have;

Number of Fe atoms = 0.450 × 6.02 * 10^23

Number of Fe atoms = 2.71 × 10^23 atoms.

Note: Fe is the symbol for the chemical element Iron.

Answer:

Air in the atmosphere acts as a fluid. The sun's radiation strikes the ground, thus warming the rocks. As the rock's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air which is warmer than the surrounding air. This bubble of air rises into the atmosphere.

Explanation:

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Answer:

Explanation:

mixture of iron filings, sand, and sugar

First Step - Iron Fillings

Use a magnet to separate the iron fillings from the mixture. Due to magnetic properties of the iron fillings, the magnets would attract the iron fillings and separate it from the mixture.

Second step - Sand

Place the sand and sugar mixture in water. The sugar would dissolve in water and the sand easily separated by filtration.

Third step - Sugar and Sugar water

Boil the sugar water to remove the water and place in the refrigerator for crystallization of the sugar.

answer:

-4

hope this helps