Which row gives the correct order of reactivity of the four metals?
(look at the attached photo)

Answer:

1.316 moles of Aluminum

Explanation:

The molar mass for Al is 26.98 g/mol

[tex]\frac{35.5g}{26.98g/mol} =1.316 moles Al[/tex]

Answer:

A

Explanation:

lions only eat meat, antelopes are prey

The answer would be +208 J.

Answer:

force had thrown the object with more

Answer:

If an object is in motion and more force is applied to it, the object will begin moving faster

Explanation:

don't have any (sorry:[ )

Answer:

Explanation:

D

A decrease in the outside insect population

Answer:

ch20 is the empirical formula for glucose , c6h1206 is the molecular formula .

Answer:

hi

Explanation:

The compound in medicines should be non polar. Therefore scientists need to be sure of using compounds that are non polar in nature so they pass through the cell membrane and enter into the blood circulation of the body and perform its due function.

Answer:

A.) 12

Explanation:

The number of valence electrons= the group number

Answer:

c) 3 valence elcertons

Answer:

global wind patterns. the rotation of the Earth. the shape of the ocean basins.

Explanation:

Answer:

Decomposition

Explanation:

Answer:

it may be +1 or -1 hope this help

An atom is a kind of stuff that cannot be further decomposed chemically. Therefore, the charge on a single proton is +1.

The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.

Some substances are either bigger or smaller than atoms. Instances of chemical species that aren't commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles. Atoms make up molecules and compounds, however they are not actual atoms. Salt is an example of a molecule and a compound (NaCl). The charge on a single proton is +1.

Therefore, the charge on a single proton is +1.

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Explanation:

helium

Helium gas is not found in earth crust

Answer:

16

Explanation:

2 KMnO4 (aq) + 16 HCl (aq) → 2 MnCl2 (aq) + 2 KCl (aq) + 5 Cl2 (g) + 8 H2O (l)

This is an oxidation-reduction (redox) reaction:

2 MnVII + 10 e- → 2 MnII (reduction)

10 Cl-I - 10 e- → 10 Cl0 (oxidation)

KMnO4 is an oxidizing agent, HCl is a reducing agent.

This is a gas evolution reaction, Cl2 is the formed gas.

Explanation:

I Would Determine Mass,Volume And Weight

Answer:

Enthalpy is a property of a thermodynamic system, defined as the sum of the system's internal energy and the product of its pressure and volume, H = U + pV

Explanation:

Fogging a mirror with your breath is a physical change because it involves a phase change of water vapor condensing and adsorbing to the mirror surface. Phase changes are physical changes.

Breaking a bone is a physical change insofar as we're focusing on the  "breaking" part.

Mending a broken bone, however, is a different story. Bones are living things: They consist of tissues that in turn consist of cells. The actual mending process involves some very complicated biochemistry. Suffice it to say that mending a broken bone would be a chemical change.

Burning paper is a chemical change. Burning anything implies combustion, which is a chemical reaction where some fuel is oxidized (usually by oxygen gas, producing carbon dioxide gas and water vapor).

Slicing potatoes for fries is a physical change. You can slice, dice, smash, mash, stretch, bend, compress, or grind a potato: What you will have is still a potato (okay, there are some chemical changes going on as you're rupturing cells in the process, causing them to release their contents which may participate in chemical reactions). But the key, again, is that cutting up some material doesn't fundamentally change the chemical identity of that material.

Mixing sugar with coffee actually involves two physical processes: the mixing and the (presumed) solvation of the solid sugar particles as they dissolve into the coffee. In either case, either mixing or dissolving would be a physical change. The sugar molecules are still in the coffee and are chemically unchanged.

Frying chicken is a chemical change. In fact, frying chicken likely entails several different types of chemical changes. The common thread among them is that frying involves breaking chemical bonds in and on the chicken by the addition of thermal energy, and new chemical bonds end up being formed. That's the hallmark of a chemical change.

A nail rusting is a chemical change. Rusting is an electrochemical process; the familiar corrosion of iron into rust is, at bottom, a chemical reaction where iron reacts with oxygen to form iron oxides (often catalyzed by the presence of water and salts).

A paper ripping is analogous to slicing potatoes: it's a physical change. If you ripped one sheet of paper into two halves, each half would retain all the chemical properties of the original sheet.

Likewise, wood burning is analogous to burning paper, and as such is a chemical change. Again, combustion is a chemical process.

As we said earlier with sugar in coffee, mixing in itself is a physical process. While it may seem like you've permanently changed the nature of the water by dyeing it with food coloring, the molecules comprising the food coloring are simply dispersed within the vast sea of water molecules. There are no intramolecular bonds that are broken or formed; the chemical identities of all the substances here are preserved. So, this is a physical change.

Food molding (rotting) is a chemical change. Rotting is biochemical decomposition: the chemical bonds that make up the food are broken down by enzymes released by the mold.

Writing on paper, whether it be with a pen, pencil, crayon, or marker, is a physical change. The molecules from the writing instrument are physically stuck to the paper. But unless you're writing on paper by, say, burning letters onto it, there are no chemical changes occurring when the writing instrument meets the paper.

As with writing on paper, dyeing fabric can be a physical change. The dye consists of molecules that interact with light in a way that we perceive a certain color. When dyeing fabric, these molecules are transferred and fixed into the fabric by adsorption, absorption, and other intermolecular phenomena. But the molecules of the dye (and the molecules in the fabric) don't experience any breaking and forming of bonds. All of the substances involved retain their chemical identities.

However, it's possible that, depending on the dye, there may be chemical changes involved. Some dyes, appropriate named "reactive dyes," undergo chemical reactions with their substrate (which, in this case, would be the fabric), or dyes may be used that undergo chemical reactions with one another, both of which would constitute chemical changes. And it can depend on what you mean by "dyeing": Bleaching a colored shirt can technically be conceived of as "dyeing" the shirt white, and this process involves cleavage of bonds within the color-producing molecules in the fabric by reacting with the molecules in the bleach.

So, for dyeing fabric, it can be a physical or chemical change depending on the dye.  

Answer:

A Family Portrait

That element is NOT in the family. When we told you about families, we said that they were groups of elements that react in similar ways. Hydrogen is a very special element of the periodic table and doesn't belong to any family. While hydrogen sits in Group I, it is NOT an alkali metal.

Answer:

Explanation:

The chemical properties are so different and cannot be group into a family Hydrogen is the simplest, smallest and lightest of the elements. Unlike the other elements of the periodic table, the combination of properties it exhibits doesn't match any one single grouping or family.

Answer:

I think the answer would be option d.

hope it helps.

Answer: Point north.

Answer:

hydrocarbons are compounds which contains Hydrogen and carbon

Answer:

SO₄²-, -2, CuSO4

Explanation:

Dang that was long.

Answer: V has the units of liters, and T has the units of kelvin.

Ideal gas law: p·V = n·R·T.  

atm · L = mol · L·atm/mol·K · K; both side of equatation have same values.

R = 0,08206 L·atm/mol·K; universal gas constant.  

p is pressure of the gas, unit is standard atmosphere (atm).

V is volume of the gas, unit is liters (L).

n is amount of substance of the gas; unit is mole (mol).

T is temperature of the gas, unit is Kelvin (K

Hope this helps!!

Explanation:

Answer: V has the units of liters, and T has the units of kelvin.

Explanation:

option D Balanced force

Answer:

D.) The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.

Answer

The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.

c.15gof in25mlof wather

The sugar solution that is the most concentrated is 15 g of sugar in 25 mL of water.

CONCENTRATION:

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Answer:

true

Explanation:

Answer:

Explanation:

there should be more showing than telling