I need the “why” also. Will mark brainliest

Answer:

B

Explanation:

Answer:

You can get 7 answers wrong.

Explanation:

Let's calculate the average

[tex]\frac{15}{2} \\\\=7.5[/tex]

So if you correctly answer 8 -15  (7.5 is approximated to 8 )questions correctly you will pass.

So you can get 7 answers wrong.

Answer:

The one on the top,'' As the water cool, it is returned to the boiler where it is heated,''

Explanation:

Answer:

replacement

Explanation:

Because the No and The Ci switch but it might not be the answer but I know that they have to switch and replacement sounds like the best answer

Answer:

Oxidation

Explanation:

Hope this helps :)

Answer:

the formula for mass number is "mass number = protons + neutrons".

Answer:

The anser is c

Roman numerals are used to indicate oxidation states. Hence, option C is correct.

An oxidation state is a number given to the atom of an element when participating in a chemical reaction.

Roman numerals are used to indicate oxidation states of transition metals.

The names for transition metal compounds often have roman numerals in them, because the roman numerals indicate the charge on the transition metal. But the oxidation state of Cu in CuO is +2, and the oxidation state of Cu in [tex]Cu_2O[/tex] is +1. Name metal first and charge and transition metal with a roman numeral.

The transition metals may form more than one ion, thus it is needed to be specified which particular ion we are talking about. This is indicated by assigning a Roman numeral after the metal. The Roman numeral denotes the charge and the oxidation state of the transition metal ion.

[tex]Fe^{2+}[/tex] would be named iron (II) and [tex]Fe^{3+}[/tex] would be named iron (III).

Hence, option C is correct.

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Answer:

chemichal potential

Explanation:

Answer:

Gravitational Potential

Answer:

moles H = 2 x 0.0649=0.130

ions = 0.130 x 6.02 x 10^23=7.81 x 10^22

Explanation:

Answer:

nonmetel

Explanation:

Answer:

Its a non-metal

Explanation:

Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gaseous, liquids or solids.

Answer:

ΔT = 0.843 °C

Explanation:

Given data:

Heat added = 0.484 J

Mass of water = 0.1372 g

Temperature increase = ΔT = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Specific heat capacity of water is 4.184 j/g.°C

Now we will put the values in formula.

0.484 j = 0.1372 g × 4.184 j/g.°C× ΔT

0.484 j = 0.574j/°C× ΔT

ΔT = 0.484 j / 0.574j/°C

ΔT = 0.843 °C

Answer:

Explanation:

7.706 g of CO₂ will contain 12 x 7.706 / 44 g of C

= 2.1 g of C .

This will be contained in 3.256 g of isopentyl acetate

3.156 g of H₂O will contain 2 x 3.156 / 18 g of H

= .351 g of H

This will be contained in 3.256 g of isopentyl acetate

Rest will be oxygen

amount of oxygen in 3.256 g of isopentyl acetate

= 3.256 - ( 2.1 + .351 )

= .805 g

ratio of C , H , O in isopentyl acetate

= 2.1 g : .351 g : .805 g

2.1 / 12 : .351 / 1 : 0.805 / 16 ratio of moles

= .175 : .351 : .05  ratio of moles

= 3.5 : 7.02: 1

= 7 : 14 : 2

empirical formula of  isopentyl acetate

= C₇ H₁₄ O₂ .

Answer:

Ripping a Paper

Explanation:

Physical Properties changed - The size has decreased, and the shape has changed.

Chemical property- Flammability

Answer:

The mass number of the atom is equal to the sum of the number of protons and neutrons in the nucleus

Explanation:

Each proton and each neutron weigh one amu( atomic mass unit), adding together the neutrons and protons and multiplying by 1 amu you get the mass of an atom

Answer:

There are many ways to figuring this out: you could use a ruler, a calculator or scrap paper.

Explanation:

This is not an actual flat out answer, but it’s helpful methods to getting the answer the next time you are stuck. Hope you are having a nice day. Bless your heart and soul.

Answer:

2.7g/cm³

Explanation:

Given parameters:

Dimension of the aluminum  = 10.5cm x 10.5cm x 0.1cm

Mass of the aluminum  = 29.8g

Unknown:

Density  = ?

Solution:

Density of a substance is its mass per unit volume;

  Mathematically;

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

Volume of the aluminum  = 10.5cm x 10.5cm x 0.1cm = 11.025cm³

  So, insert the parameters and solve;

  Density  = [tex]\frac{29.8}{11.025}[/tex]   = 2.7g/cm³

Answer:

You're right

Argon is an inert gas.

Explanation:

Answer:

Argon is in zero group and it has octet structure so argon will not react with any compound

Answer:

X represents barium - 141 nucleus.

Written as: (141, 56) Ba

Explanation:

In nuclear fission reaction, due to the fact that the process produces more neutrons, a nuclear chain reaction can possibly occurr. Now, a chain reaction is a one whereby the material that begins the reaction will also be one of the products and it can start another reaction.

Now, for the nuclear chain reaction for the fission of uranium-235, its nucleus absorbs a neutron after which it splits into a krypton - 92 nucleus and a barium - 141 nucleus. Thereafter it releases three more neutrons.

Thus, X is the image represents barium - 141 nucleus.

(141,56) Ba

Answer:

A. They are nonreactive gases

Answer:

5

Explanation:

Answer:

Newton's third law of motion states that whenever a first object exerts a force on a second object, the first object experiences a force equal in magnitude but opposite in direction to the force that it exerts. Newton's third law is useful for figuring out which forces are external to a system

Explanation:

Answer:

Newton's third law of motion states that whenever a first object exerts a force on a second object, the first object experiences a force equal in magnitude but opposite in direction to the force that it exerts. ... Newton's third law is useful for figuring out which forces are external to a system.

Explanation:

Atomic weight of metal : 24

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

Divalent metal oxide=XO

MW O = 16

MW XO₂ =  X+16

[tex]\tt \%mass=\dfrac{Ar~X}{X+16}\times 100\%\\\\0.6=\dfrac{X}{X+16}\\\\0.6(X+16)=X\\\\0.6X+9.6=X\\\\0.4X=9.6\rightarrow X=24[/tex]

Answer:

Group 2 is the correct answer.

Explanation:

Chlorine has a charge -1. It means that X is +2 so that the formula is XCl2.

Explanation:

heat in the Earth's core

Answer:

What mass of silver will raise the level of the water in the graduated cylinder 1.50 mL? (Ans) 28.95 g / 1.50 mL = 19.3 g/mL (The gold's density)

19.3 gm/ml³ is the density of gold  .

Density, mass of a unit volume of a material substance. Density of a substance tells how close the particles of a substance are packed.

The formula for density is D = M/V, where d is density, M is mass, and V is volume.

Density is commonly expressed in units of grams per cubic centimeter.

The SI unit of density is kilogram per cubic meter (kg/m3).

It is also represented  in the c g s unit of grams per cubic centimeter (g/cm3).

To calculate density of gold (here):

Given,

Mass of gold=28.95 gm

Volume of water=1.50 mL

Density=?

Density =Mass/Volume

Density=28.95/1.50

Density=19.3 gm/ml³

Hence, 19.3 gm/ml³ is the density of gold .

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Answer:

1. The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid or to that fraction of the volume below the surface of an object partially submerged in a liquid. The weight of the displaced portion of the fluid is equivalent to the magnitude of the buoyant force.

Why would you use this method?

So it can be used to accurately measure the volume of the human body and other oddly shaped objects by measuring the volume of fluid displaced when the object is submerged.

2. Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

What happens to things that are denser?

Students should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float.

What happens if they are less dense?

The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.