HELP PLSSPLSPLSSS ILL GIVE BRAINLIEST

Answer:

They are all made of cells

Answer: They are all made of cells.

Explanation:

Answer:

false

Explanation:

Waves are created because othe the lunar pull with out the moon we wouldnt have waves

Answer:

Synthesis of Potassium Nitrate (KNO3)

When potassium hydroxide neutralizes nitric acid potassium nitrate is formed.

Answer:

Below.

Explanation:

Nitric acid and potassium hydroxide:

HNO3 + KOH  ---> KNO3 + H2O.

Answer:

K = 30N/m

Explanation:

We use this equation:

F= k∆x

Where ∆x refers to the amount or stretch or compression and k is the spring constant.

F = force

k = spring constant

∆x = change in length of spring

We don't know the value of k, so we make k the subject:

k = F/∆x

k = 6N x 0.2m

k = 30N/m

Answer:

Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.

Answer:

Chemical energy in the grass is transformed into thermal energy in the rabbit.

Explanation: Hope this helps

Answer:

false

Explanation:

because if one of the p-protein of one is less then then the eyecolor will be different

Answer:

well, we have so much better and more tech and we are a lot smarter than we were before.

Explanation:

Answer:

We have way more advanced technology than our ancestors and we have a better idea of how the earth was millions of years ago.

Explanation:

Answer:13.70 i think

Explanation:

Answer: A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass. The kinetic energy of an asteroid falling towards earth is very large. The kinetic energy of the aeroplane is more during the flight due to large mass and speedy velocity.

Explanation:

Mass of PH3= 6.086 g

Given

6.0 L of H2

Required

mass of PH3

Solution

Reaction

P4 + 6H2 → 4PH3

Assumed at STP ( 1 mol gas=22.4 L)

Mol of H2 for 6 L :

= 6 : 22.4 L

= 0.268

From the equation, mol PH3 :

= 4/6 x moles H2

= 4/6 x 0.268

= 0.179

Mass PH3 :

= 0.179 x 33,99758 g/mol

= 6.086 g

Answer:

Molecular formula = C₆H₄Cl₂

Explanation:

Given data:

Percentage of hydrogen = 2.7%

Percentage of carbon = 49%

Percentage of chlorine = 48.2%

Molar mass of compound = 150 g/mol

Molecular formula = ?

Solution:

Number of gram atoms of H = 2.7 / 1.01 = 2.67

Number of gram atoms of Cl = 48.2 / 16 = 1.36

Number of gram atoms of C = 49 / 12 = 4.08

Atomic ratio:

            C                      :           H             :           Cl

           4.08/ 1.36         :     2.67/1.36       :       1.36/1.36

            3                      :        2                 :        1

C : H : Cl = 3 : 2 : 1

Empirical formula is C₃H₂Cl.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass = 12×3 + 1.01 ×2 + 35.5 = 73.52 g/mol

n = 150 / 73.52

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₃H₂Cl)

Molecular formula = C₆H₄Cl₂

Answer: the answer is d

Explanation:

Decane + Dioxygen = Carbon Dioxide + Water

Reaction Type

Combustion

Answer:

No

Explanation:

The conclusions from Thomoson's claims would be invalid if his experiment could not be replicated.

One of the attributes of a valid experiment in science is replication. That is, an experiment must be repeatable with similar outcomes under similar conditions as the original experiment when independently performed by another scientist. Once an experiment cannot be replicated, the outcomes of such an experiment become invalid in science.

Hence, Thomoson's conclusion would be invalid if his experiment could not be replicated.

Answer:

Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff.

Explanation:

Answer:

0.265 moles

Explanation:

From the equation given;

Number of moles of HCl is 6 while number of moles of H is 3.

Now, we know from avogadro's number that 1 mole of a gas = 6.022 × 10^(23) molecules.

We want to find the number of moles of Hydrogen gas made when 3.2 x 10^(23) molecules of HCl are used.

Thus, converting this to moles gives;

(3.2 × 10^(23))/(6.022 × 10^(23)) = 0.53 moles

Thus, we can find the number of hydrogen gas by proportion as;

n = 3/6 × 0.53

n = 0.265 moles

Answer:

C. Copper (II) nitrate

Explanation:

It's an inorganic compound that forms a blue crystalline solid

Ions are the charged species of the atom that carries an extra or less electron. The chemical name of the compound Cu(NO₃)₂ based on polyatomic ions is copper (II) nitrate. Thus, option C is correct.

An ionic compound is a type of chemical compound that is characterized by the presence of the ions or the charged species that results in electrostatic forces leading to the ionic bond formation.

The copper (II) nitrate compound is an example of an ionic compound as the Cu atom is metal and nitrogen and oxygen atoms are the non-metals. The metallic part of the compound carries a +2 charge while the non-metallic part consists of a negative charge.

Therefore, option C. Cu(NO₃)₂ can be named chemically as copper (II) nitrate.

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Answer:

1, 2, 2, 1

Explanation:

Answer:

Mn

Explanation: 4th shell so 4th row and count 7 from the left most column

Answer:

Potassium selenide

Explanation:

Potassium selenide (K2Se)

Answer:

Potassium selenide

Explanation:

Answer:

draw the carbon chain is containing 6 carbon then attach the aldehyde group with edge carbon in chain then put the put double bond at 3 no. carbon

A raised weight.

Water that is behind a dam.

Have a nice day!

Answer:

When something has a high position, its gravitational potential energy is high. For example, a book on a high bookshelf has higher potential energy than a book on the bottom shelf because it has farther to fall. ... A book on a table before it falls. A child at the top of a slide.

Explanation:

U=m g h

Answer: 0.02 moles

Explanation:

The number of moles in 4.38 g of AgNO₂ is equal to 0.028 mol.

A mole can be described as a standard unit that can be utilized to calculate a given number of particles. The constituents counted are usually individually distinct but identical entities.

A mole of the substance can be used to calculate quantities of atoms, molecules, ions, or other particular particles. The quantity of matter can be described as measured by elementary entities.

The number of constituents present in one mole is equal to 6.023× 10 ²³ which is known as Avogadro’s constant.

Given, the mass of AgNO₂ = 4.38 g

The mass of one mole of AgNO₂ =  153.87 g

The number of moles of in 4.38 g of AgNO₂ = 4.38/153.87 = 0.028 mol

Therefore, the number of moles of  AgNO₂ is equal to 0.028 mol.

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Answer:

The law of conservation of mass states that in a closed system, the whole mass is conserved.

But the law of conservation of mass is not accurate sometimes in lab because in every chemical reaction, mass is converted into energy and not the whole mass can be conserved. Energy in chemical reaction can be created only by destroying the mass and not from any other means.

This is why,  sometimes in a lab it seems like the conservation of mass isn’t accurate.

Single Replacement

Given

Reaction

Mg(s) + 2 HCl(aq) → MgCl2 (aq) + H2 (g)

Required

Type of reaction

Solution

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

General formula :

A + BC ⇒ AC + B

Not all of these reactions can occur. We can use the activity series(the Volta series)

The more left the position of a metal in the series, the more reactive metal (easy to release electrons, the stronger the reductor)