can anyone heelp me pls

Explanation:

9) a) (9.84×10³)/(6.12×4.27×10³+⁷) = 9.84×10³/6.12×4.27×10¹⁰ = 9.84×10³-¹⁰/6.12×4.27

= 0.376×10^-7.

b) (4.36×10⁸×1.82×10³)/(0.0856×4.7×10⁶)

= (7.9352×10⁸+³)/(0.40232×10⁶)

= 19.72×10⁸+³-⁶ = 19.72×10⁵

hope this helps you.

Answer:

a) 2Ba + O2 → 2BaO

b) 2HCl + Mg → MgCl2 + H2

c) 2HCl + CuO → CuCl2 + H2O

d) Fe + O2 → Fe2O3

Explanation:

Okay so for

a), you must add 2 at the front of Ba and BaO bcuz you're gonna need your equation balanced.

like as you can see, O has 2 so yeahh, you've got to balance it nicely.

b) you must add 2 in front of HCl bcuz the Cl and H after the reaction happened has 2 in them, were talking about balancing so XD

c) and yes again, you're gonna have to add 2 in front of HCl bcuz of the same reason as b).

d) D is definitely a special case bcuz, Fe3+ with O2, so well if you do the cross multiplication technique you'll automatically get Fe2O3. Yas that's it.

English is not my first language so it's hella tuff to explain it to you from in much more detailed perspective T-T Sorry (´∩｡• ᵕ •｡∩`)

Answer:

50 points for this easy question

Answer:

The volume of an object can be calculated by multiplying its length, width and height. Further, depending on the shape of the object, its volume changes.

Explanation:

Hope this helps

Answer:

can you show me a picture of the pie chart?

Explanation:

if i dont see the pie chart then this question isn't possible to answer

Answer:

atoms have no overall charge. this is because they contain equal numbers of positive protons and negative electrons

Answer:

c

Explanation:

Answer:

Location b is experiencing summer

In the Northern Hemisphere, Summer season is represented here location B.

Answer:

If you could miraculously remove two neutrons from an atom's nucleus, the atomic number and electrical charge would stay unaltered. Because neutrons have no electrical charge, adding or removing them from the nucleus has no effect on the nucleus's electrical charge. It does, however, alter the nucleus's mass. Isotopes are formed by adding or subtracting neutrons from the nucleus.

Answer:Me and my family went out and I fell into water and turnt into a water droplet and my family catches me in they hand and put fire

Explanation:

Answer:

what

Explanation:

Answer:

Olfactory indicators

Explanation:

The substance whose odour changes in an acidic of basic medium are called olfactory indicators. In an olfactory indicator , smell varies depending on whether it is mixed with an acidic or basic solution.

Answer:

Researching maybe? That's a scientific method lol

Answer:

4.56 X 10^ -4 g/mL

Explanation:

A solution is  prepared by diluting 6.0 mL of a 7.6 x 10-4 g/mL solution to a total volume of 10.0 mL. Calculate the concentration of the dilute solution.

(7.6 X10^-4  gm/m L) x( 6.0 m L ) = 45.6 X 10^-4 g

this is dissolved )in 10 m L=45.6 X 10^-4  g/ 10

4.56 X 10^ -4 g/mL

check

6/10 =0.6

4.56/7.6 = o.,6

1.       Name the non-metal furthest to the left on the periodic table by its elemental name.

2.       Name the other non-metal by its elemental name and an -ide ending.

3.       Use the prefixes mono-, di-, tri-.... to indicate the number of that element in the molecule.

4.       If mono is the first prefix, it is understood and not written

Answer:

Rules for naming simple covalent compounds:

1.    Name the non-metal furthest to the left on the periodic table by its elemental name.

2.   Name the other non-metal by its elemental name and an -ide ending.

3.    Use the prefixes mono-, di-, tri-.... to indicate the number of that element in the molecule.

4.  If mono is the first prefix, it is understood and not written

Examples:

Here is a chart of those prefixes:

1 - mono

2 - di

3 - tri

4 - tetra

5 - penta

6 - hexa

7 - hepta

8 - octa

9 - nona

10 - deca

Answer:

because our feet has more density

Answer:

sorry

Explanation:

i'm not a chemistry student

but let me try

it is because the neutron of an atom is -

why the proton and electron is +and- (positive and negative)

so + and - = 0

Answer:

More Reactive:

iron

hydrogen

zinc

magnesium

zinc

iron

Explanation:

The reactivity of metals can be determined based on their ability to displace other metals from their compounds or to displace hydrogen from acids. Generally, metals that are higher in the reactivity series can displace metals lower in the series.

1. **Iron & Copper:** Iron is more reactive than copper. If iron is present in its pure form, it would displace copper from its compound.

2. **Copper & Hydrogen:** Hydrogen is less reactive than copper. No reaction will occur if hydrogen is the element in pure form.

3. **Zinc & Iron:** Zinc is more reactive than iron. If zinc is present in its pure form, it would displace iron from its compound.

4. **Iron & Magnesium:** Magnesium is more reactive than iron. If magnesium is present in its pure form, it would displace iron from its compound.

5. **Zinc & Hydrogen:** Hydrogen is less reactive than zinc. No reaction will occur if hydrogen is the element in pure form.

6. **Iron & Hydrogen:** Hydrogen is less reactive than iron. No reaction will occur if hydrogen is the element in pure form.

Remember, the reactivity series is a ranking of metals based on their tendency to lose electrons and form positive ions. Elements higher in the series can displace elements lower in the series from their compounds in certain reactions.

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Answer: Metallic bonding.

Explanation: Aluminum forms metallic bonds with itself. This results in a metallic lattice structure.

Aluminum is found in the 13 group of periodic table and it mostly forms ionic bonds with metal. The structure of Aluminum is Orthorhombic mainly.

What is element?

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

The structure of Aluminum is Orthorhombic and it contains high neutron capture cross section. It is very stable in dry air but oxidizes in moist air. It reacts with oxygen to form Al₂O₃.Valence of Aluminum is III. Its electronic configuration is  [Ar]3d¹⁰ 4s² 4p¹

Thus  structure of Aluminum is Orthorhombic and metallic bond is formed by Aluminum

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Answer: How to calculate the mass percent by using these instructions

1.The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).

2.The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.

Explanation:

The atomic mass of K is 39

from Avogadro's law

39g of K contains 6.02x10^23 atoms

therefore if

39=6.02x19^23

X=5.11×10^22

making X the subject of the formula

X= (5.11×10^22×39)÷6.02×10^23

X= 33g

The statement, that describes grams of potassium (K) contain 5.11 × [tex]10^{22}[/tex] atoms is "33.1 g."

An atom is a fundamental particle of matter that contains at least one proton.

1 mole will be of 6.022 × [tex]10^{23}[/tex] atoms

Then,

[tex]= 5.11*10^{22} \;atoms\;.\;\frac{1\;mol}{6.022*10^{23} \;atoms} \;.\;39.098\;g/mol\\\\= 33.171\;g[/tex]

≈ 33.1 g

As a result, 33.1 g of K contains 5.11 × [tex]10^{22}[/tex] atoms.

Hence, the correct option is 33.1 g.

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Hey There :

Volume initial = ?

Volume final = 5000 mL

Molarity initial = 4 M

Molarity final = 0.1 M

Therefore :

Mi * Vi = Mf * Vf

4 * vi = 0.1 * 5000

4 vi = 500

Vi = 500 / 4

Vi = 125 mL

Answer A

Hope this helps!

Taking into account the definition of density,  the mass of two cubic inches (2.00 in³) of gold is 632.54 grams.

But first you must know the definition of density. Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words,  density is a scalar quantity referring to the amount of mass in a given volume of a substance, that is, it shows the relationship between the weight (mass) of a substance and the volume it occupies.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

In this case, you know that:

Replacing in the definition of density:

[tex]19.3\frac{g}{cm^{3} } =\frac{mass}{32.7741 cm^{3} }[/tex]

Solving:

mass= 19.3 [tex]\frac{g}{cm^{3} }[/tex]× 32.7741 cm³

mass= 632.54 g

In summary, the mass of two cubic inches (2.00 in³) of gold is 632.54 grams.

Learn more about density:

Answer:

1-air

2-decrease

3-water

4-gas

5-liquid

I THINK the answer to part b is A but I am not entirely sure

Explanation:

Answer:

Transmutation is the conversion of an atom of one element into an atom of a different element through nuclear changes.

An alpha particle is a particle composed of 2 protons and 3 neutrons. It results from transmutation because of the change in protons in a large nucleus.

A chemical equation is balanced accord to the number of atoms of each element before and after the change. This is also shows the Law of Conservation of Matter.

A nuclear equation is balanced according to mass number and charge (atomic number). These equations can’t be balanced like chemical equations because the identities of the atoms can change.  On the left of equation, the top number is the atomic mass and the bottom number is the atomic number. Take note that if you add the atomic mass (top number), you’ll get the the atomic mass of of the atom pre-transmutation. Same applies with atomic number. This shows a balanced nuclear equation.

The atomic number is the number of protons in a nucleus. The mass number is the sum of the protons and neutrons in a nucleus. Electrons have very small masses, so they are not accounted in atomic mass.

Answer:K2X

Explanation: Valency can be defined as the combining power of an element. It is the valency that dictates the value an element will have when writing a chemical formula for its compound.

MgX is a compound of magnesium and an element X. The valency of magnesium in most of its compound is +2. Now for the 2 to have been absent in the chemical formula, this shows that the element X itself have a valency if -2 for the valencies of both to have canceled out.

Now considering the element potassium, it is an alkaline metal belonging to group 1 of the periodic table. Hence, it is expected that it has a valency of +1

Forming a compound with element X means there would be an exchange of valencies between the two. We have established that x has a valency of -2. The formula of the compound thus formed by exchanging the valencies of both element would be K2X

The chemical formula for the compound formed between Lithium and element X is Li₂X.

Valency can be described as the combining power of a chemical element. It is the valency that describes the value an element will have in the chemical formula for that compound.

MgX compound is a compound of magnesium and an element X. The valency of magnesium is +2.  The chemical formula shows that the element X itself has a valency of -2 which gave a neutral compound.

Now given element is Lithium, it is an alkali metal of group 1 of the periodic table. It has a valency of +1 as it has one electron in its valence shell.

Forming a compound with element X, there will be an exchange of valencies between the two. As element X has a valency of -2. The formula of the formed compound by exchanging the valencies of Lithium and element X would be Li₂X

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Answer:

different from the number of their neutrons

Explanation:

They each have one single proton (Z = 1), but differ in the number of their neutrons. Hydrogen has no neutron, deuterium has one, and tritium has two neutrons. ... Their nuclear symbols are therefore 1H, 2H, and 3H. The atoms of these isotopes have one electron to balance the charge of the one proton.

Answer:

1.epithelial cells,2.nerve cells,3.muscle cells and 4.connective tissue cells.

Explanation:

1.these cells protect your body from injury.

2.you would have no consciousness or control ur body without nerve cells.

3.can contract to regulate the diameter of hollow organs.

4.to strengthen tissues.