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Answer:

63.5 copper

Explanation:

You have the balanced equation: CuO + H2 --> Cu + H2O. You can use stoichiometry and see there is a 1:1 molar ratio between CuO and Cu.

1) work out the moles of CuO.

- mol=mass/mol mass = 79.5g/(63.5+16.0) = 1 mol CuO

2) work out mol Cu

- from the 1:1 mol ratio you know if you have 1 mol CuO you must have 1 mol Cu. So mol Cu=1 mol

3) work out mass of Cu

- mol=mass/mol mass therefore mass= mol x molar mass = 1 x 63.5g/mol-1 = 63.5g Cu

Answer:

The geological time from the longest to the shortest are:

Answer: it's required for all chemical reactions in a cell.

Explanation: took the test. please vote :-)

The aqueous environment is vital for cellular functions, facilitating chemical reactions, maintaining structure, and enabling cellular processes.

Option (D) is correct

The aqueous environment within a cell, primarily composed of water and various dissolved molecules, plays a crucial role in cellular processes. It enables and supports a multitude of chemical reactions necessary for cellular metabolism, growth, and maintenance.

Water's solvent properties allow biochemical reactions to take place, aiding in nutrient transport, waste removal, and cell signaling. Moreover, water's cohesive and adhesive forces contribute to maintaining cellular structure and preventing organelles from sticking together, ensuring proper compartmentalization and functioning.

While it does not provide energy directly, the aqueous environment indirectly sustains cellular energy processes by facilitating reactions within the cell. Additionally, the fluidity of the aqueous environment enables cells to change shape, promoting functions such as migration, phagocytosis, and division.

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The complete question is:

Why is the aqueous environment of a cell important?

A) It prevents organelles in a cell from sticking together.

B) It allows cells to bend and change shape as needed.

C) It provides a constant energy source for a cell. I

D) t's required for all chemical reactions in a cell.

Answer:

9.85

Explanation:

M1V1 =M2V2

6.20×v1= 0.470×0.130

v1 = ( 0.470 × 0.130 ) ÷ 6.20

v1 = 0.0098 L × 1000

V1 = 9.8 ml

Answer:

Mass number =  195

Explanation:

Isotope:

An atom of an element that contain same atomic number but different atomic mass.

The difference in atomic mass is due to the different number of neutrons present, but the number protons and electrons are remain same.

In given isotope of an atom there are 85 protons and 85 electrons while number of neutrons are 110.

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.

Mass number =  number of protons + number of neutrons

Mass number = 85 + 110 = 195

Answer:

i think you mean what is the kingdom of plants, but its "Kingdom Plantae".

Kingdom Plantae traits: eukaryotic/have nucleus, multicellular and autotrophic. (they photosynthesis)

2nd largest kingdom

Answer:

Introduction: All the plants are placed in the Kingdom- Plantae, according to the five-kingdom classification by R.H. Whittaker. The Kingdom- Plantae consists of multicellular plants with eukaryotic organization and chlorophyllous cells.

Explanation:

What is the kingdom for plants called?

What are the 3 plant kingdoms?

Kingdom Plantae Organisms

Ferns: They fall under the division Pteridophyta and are known to have vascular tissue. ...

Mosses: They fall under the division Bryophyta and have no vascular system. ...

Cone-bearing plants: They fall under the division Spermatophyta, sub-division gymnosperms

Answer:

Blood Cells

Explanation:

Capillaries are so small that blood cells can only move through them one at a time. Oxygen and food nutrients pass from these capillaries to the cells. Capillaries are also connected to veins, so wastes from the cells can be transferred to the blood.

Answer:

Explanation:

1. It reacts with hydrogen when heated

     Chemical property

2. It is a yellow solid at room temperature

    Physical property

3. It is soluble in carbon disulfide

    Chemical property

4. Its density is 2.97 g/cm3

    Physical property

5. It melts at 113°C

    Physical property

Physical properties tells us everything about what substance is when no change is occurring to its constituents.

It can be observed using apparatus and instruments. Examples are state of matter, color, odor, taste, texture, hardness, solubility in water, density, melting point and boiling point

Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances. Examples are flammability, rusting of irons, precipitation, decomposition of water by an electric current.

Homo Sapiens themselves are the primary consumers as they feed on fruits, vegetables, etc.

Also, they are the secondary consumers as they feed on other organisms too like pigs, chickens, etc.

Answer:

D.

Explanation:

Honestly not sure just a guess

Answer: 1/ms=8mk

Explanation:

Answer:

Wildfires

Explanation:

Answer:

Electrolysis of water

Explanation:

The electrolysis of water is a decomposition reaction in which electricity is used to break down a compound into simpler molecules.

Decomposition of water is carried out in the Hofman Voltameter.

This process is achieved by passing current through an acidified water.

The expression is given as:

               2H₂O →  2H₂   +  O₂

Answer:

a) freezing and condensation

Explanation:

During Freezing and condensation , substance release energy because these both are exothermic reactions.

Hence, the correct option is A.

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Answer:

I don't get the question? what am I supposed to be answering? these facts are all true if that's what you're looking for.

Answer:

Thanks

Explanation:

Answer:

a one rotation of the planet on its axis

Explanation:

The two types of motion that planets undergo are;

1) rotation of the planet about its axis

2) revolution of the planet around the sun.

In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.

It takes the earth 1 earth day (24 hours) to complete rotation on its axis.

Answer:

28.1

Explanation:

plez give me brainliest

Answer:

true

Explanation:

Answer:

2.78 moles of water are produced.

Explanation:

Given data:

Number of moles of H₂O produced = ?

Number of moles of oxygen react = 3.25 mol

Solution:

Chemical equation:

2C₂H₆ + 7O₂       →     4CO₂ + 6H₂O

Now we will compare the moles of water with oxygen.

                O₂          :          H₂O

                 7            :           6

               3.25        :           6/7×3.25 = 2.78 mol

Answer:

85.384 atm or 64608.13086 mmHg

Explanation:

PV= NRT

P= NRT/V

n= mols

R= gas constant (i used .0821 for atm)

T= Temp in Kelvins (Celsius degrees + 273)

V= in L

(65molsx480kx.0821)/30L

Rutherford model of the atom states that positive nucleus surrounded by a blob of negative charge.

What is Nucleus ?

The positively charged area at the centre of each atom is known as the nucleus .

It is made up of two different subatomic particle kinds that are closely clustered.

Protons, which have a positive electric charge, and neutrons, which have no electric charge, are the particles.

According to Rutherford's theory, an atom's nucleus is surrounded by electrons that are negatively charged.

He also asserted that the electrons that surround the nucleus travel in a circular pattern at extremely high speeds. He gave these elliptical routes the name orbits.

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The mass of FeS formed : 11.97 g

Reaction

Fe(s) + S(s) → FeS(s)

mass Fe=7.62 g

mol Fe(MW=56 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{7.62}{56}\\\\mol=0.136[/tex]

mass S=8.67 g

mol S(MW=32 g/mol) :

[tex]\tt mol=\dfrac{8.67}{32}=0.271[/tex]

Limiting reactant : smaller ratio(mol:coefficient) ⇒coefficient=1

Fe : S =0.136 : 0.271⇒Fe limiting(smaller), S excess

Mol FeS based on Fe , so mol FeS=0.136

Mass FeS(MW=88 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=0.136\times 88=11.97~g[/tex]

Phenolphthalein is a drab, vulnerable acid that is appreciably used as a hallmark in titration experiments to suggest the endpoint of the titration. The endpoint is indicated with the useful resource of the formation of red color on the grounds that this compound dissociates to shape crimson anions at the same time as dissolved in water.

Titration of an antacid consists of a strong acid-susceptible base titration whose pH at the endpoint is plenty much less than seven. therefore, bromophenol blue rather than phenolphthalein is used as a trademark because the pH range of bromophenol blue is a whole lot less than seven. The pH range of phenolphthalein lies above seven.

The use of CO₂ and its impact on the signs, Phenolphthalein is often used as a hallmark in acid-base titrations. Phenolphthalein is often used as an indicator in acid-base titrations. For this utility, it turns colorless in acidic answers and crimson in simple solutions. It belongs to the elegance of dyes referred to as phthalein dyes.

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Answer:

C Plum Pudding; incorrect

Explanation:

Ernest Rutherford tested it through his famous gold foil experiment and found that it was incorrect.

Answer:

Magnesium also reacts with nitrogen in the air to produce some magnesium nitride (Mg3N2). Safety: Do not look directly at the burning magnesium due to the intensity of the light. A dry-powder fire extinguisher should be available. Disposal: Once cooled the solid magnesium products can be thrown in the trash.

Explanation:

Answer:

See explanation

Explanation:

This conversion must go through a sequence of steps as i have shown in the image attached to this answer.

The acetone is converted to propan-2-ol using LiAlH4, THF and acid. The  propan-2-ol may be converted to propene by E2 elimination. Addition of HBr yields 2-bromo propane.

The Wurtz reaction converts 2-bromo propane to 2,3- dimethyl butane. This can be brominated in the presence of light to yield 3-bromo-2,3-dimethyl butane. Elimination of HBr using a base leads to the formation of the required product as shown.

Answer:

A im pretty sure

Explanation: