Which observation would most likely indicate that an endothermic reaction has occurred? O A. a color change O B. the production of gas bubbles O C. an increase in temperature OD. a decrease in temperature​

THANK YOU SO MUCH!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer:

thank you so much!!

Explanation:

:D

Answer:

bbbbnnnnnnnnnnnnnnn

Explanation:

Answer

Fe2O3+3CO→2Fe+3CO2.

Explanation:

Answer:

1. Exothermic reaction

2. Is being released

3. The energy comes from the change in energy between reactants and products

Explanation:

The reaction is producing energy. A reaction that produce energy is called a Exothermic reaction.

As the energy is produced, the energy is being released.

As you can see in the image, the energy of the reactants is higher than the energy of the products. This change of energy in the chemicals produce the production of energy as heat.

Given that,

Four wooden blocks with masses of 2 kg, 5 kg, 7 kg, and 9 kg are placed on a table.

To find,

The block will have the least inertia.

Solution,

Inertia is the measure of mass of a body. It is directly proportional to the mass of the body.

The body having more mass will have more inertia. Out of four masses 9 kg block will have more inertia and 2 kg block will have least inertia.

Hence, the correct option is (a) " The block with a mass of 2 kg "

The wooden block of mass 2kg will have the least inertia.

The inertia of an object is defined as the property due to which an object continues in the existing state of rest or uniform motion in a straight line unless an external force is applied.

The inertia of an object is directly proportional to the mass of the object. Havier the object, it will be more resistant to any change in its state of motion or rest.

if we consider the same amount of force applied to all the wooden blocks of masses 2kg, 5kg, 7kg, and 9kg, it will be easiest to move the 2kg block and hardest to move the 9 kg block.

So, the block of mass 2kg has the least inertia while the block of mass 9kg has the maximum inertia among the given blocks.

Learn more about inertia:

https://brainly.com/question/1358512?referrer=searchResults

Answer:

mole=wt/M.wt

M.wBaH2→139.34g/mol

4.80=wt/139.34

wt=4.80×139.34

wt=668.8

wt≈669✓

According to mole concept, the mass of 4.80 mole of barium hydride is 669 g.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles is calculated as, mass/molar mass ,therefore on substitution mass=number of moles×molar mass

mass= 4.80×139.34=668.83 ≈669 g.

Therefore, the mass  of 4.80 mole of barium hydride is 669 g.

Learn more about moles,here:

https://brainly.com/question/26416088

#SPJ6

Answer:

Mantle

Explanation:

Asthenosphere, zone of Earth's mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. The asthenosphere extends from about 100 km (60 miles) to about 700 km (450 miles) below Earth's surface.

Answer:

l and lll

Explanation:

The longer the wire, the more resistance that there will be and heating a metal conductor makes it more difficult for electricity to flow through it.

Answer:

The rock cycle

Explanation:

The three types of rocks are related and connected through the rock cycle. Rocks are not formed independently of one another, the process of their formation are interconnected.

 Igneous rocks are made from cooling and solidification of magma. These magma are derived from the melting of rocks that have been subjected to high temperature and pressure.

 When igneous rocks are formed, they can follow two path ways. They either get transformed to sedimentary rocks or metamorphic rocks.

When igneous rocks are subjected to metamorphic conditions, their mineralogy is altered to form metamorphic rocks.

If igneous rocks gets weathered and broken down by agents of denudation, they end up getting transformed into sedimentary rocks.

N=n×Nav

n=N / Nav

(5.71×10^22) / (6.02×10^23)

n=0.09mol

According to the concept of Avogadro's number, there are 0.0948 moles of silver present in 5.71×10²² atoms of silver.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

Therefore, number of moles=number of atoms/Avogadro's number

number of moles=5.71×10²²/6.023×10²³=0.0948

Thus, there are 0.0948 moles in 5.71×10²² atoms of silver.

Learn more about Avogadro's number,here:

https://brainly.com/question/11907018

#SPJ2

Answer:120.0mL

Explanation:

Answer:

C. I (iodine)

Explanation:

it would be Iodine because it has 5 energy levels of electrons and has a total of 74 neutrons inside its nucleus!

Hope this helps, have a good day!

1. The water inside a plant will not be able to come out.

2. It would kill the plants and species on Earth.

3. There would be no lakes, ocean, or water on land.

One mole of carbon atoms has a mass of exactly 12 g. Because magnesium atoms each have twice the mass of carbon atoms (24Mg compared with 12C), one mole of magnesium has a mass of 24 g. In fact, one mole of any element has a mass in grams that is equal to its relative atomic mass. One mole of iron has a mass of 56 g

Answer:

Explanation:

this is what the Lewis electron-dot diagram of a Cl2 molecule looks like

Lewis electron  diagram of a chlorine molecule is attached in the picture below.

Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .

They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.

They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.They are useful in predicting the structure.

Learn more about Lewis electron  diagrams,here:

https://brainly.com/question/20300458

#SPJ5

64 g O₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced]   CH₄ + 2O₂ → CO₂ + 2H₂O

[Given]   36 g H₂O

[Solve]   x g O₂

Step 2: Identify Conversions

[RxN] 2 mol O₂ → 2 mol H₂O

[PT] Molar Mass of O - 16.00 g/mol

[PT] Molar Mas of H - 1.01 g/mol

Molar Mass of O₂ - 2(16.00) = 32.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

63.929 g O₂ ≈ 64 g O₂

Mass of O₂ needed = 64 g

Given

Reaction

CH₄ + 2O₂ → CO₂ + 2H₂O

36 grams of H₂O

Required

Mass of O₂ needed

Solution

mol H₂O :

= mass : MW H₂O

= 36 : 18 g/mol

= 2

From the equation, mol ratio of O₂ : H₂O = 2 : 2, so mol O₂=2

Mass O₂ :

= mol x MW O₂

= 2 x 32 g/mol

= 64 g

Answer:

true?

Explanation:

When a moving ball collides with a stationary ball then the forces act in action and reaction pairs according to Newton's 3rd law. Therefore, the given statement is true.

According to Newton's third law of motion, when two objects interact, they exert force on each other, and these forces are called action and reaction pairs.

Force can be defined as a push or pull acting on a body resulting in its interaction with another body. Force can be defined as a result of an interaction and is classified into two categories: contact force and non-contact force.

Newton’s third law of motion states that when the first object exerts a force on the second object, the first object experiences a force with the same magnitude in the opposite direction of the exerted force.

When a moving ball collides with a stationary ball as the moving ball collides it exerts a force on the stationary ball in reaction the stationary ball exerts an equal force on the moving ball but in opposite direction.

Learn more about Newton's third law of motion, here:

https://brainly.com/question/23772134

#SPJ2

Answer: bases

Explanation:

Answer:

C

Explanation:

Answer:

The answer is C

Explanation:

The older elephants are surrounding the calf to protect it and make sure it lives to reproduce.

Answer:

The urinary system's function is to filter blood and create urine as a waste by-product. The organs of the urinary system include the kidneys, renal pelvis, ureters, bladder and urethra.

Explanation:

Answer:

H₂O₂

Explanation:

The molecular formula gives the exact number of atoms within a chemical compound.

In this problem:

Mass of O  = 32g

Mass of H = 2g

  Let us follow this methodical approach to solve the problem:

Elements                                  O                                       H

Mass                                         32                                      2

Molar mass                               16                                       1

Number of moles                  32/16                                     2/1        

                                                  2                                         2

The molecular formula of the compound is H₂O₂                

Answer:

164moles

Explanation:

Given parameters:

Number of molecules of CO₂   = 9.86 x 10²⁵molecules

Unknown:

Number of moles  = ?

Solution:

To solve this problem, a mole of any substance contains the Avogadro's number of particles.

In that;

        6.02 x 10²³ molecules makes up 1 mole of a substance

        9.86 x 10²⁵molecules   contains [tex]\frac{9.86 x 10^{25} }{6.02 x 10^{23} }[/tex]   = 1.64 x 10²moles

The number of moles is 164moles

Answer:

Percent yield = 88.23%

Explanation:

Given data:

Percent yield of ammonia = ?

Actual yield = 15 g

Mass of nitrogen = 14 g

Solution:

Chemical equation:

N₂ + 3H₂      →     2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 14 g/ 28 g/mol

Number of moles = 0.5 mol

Now we will compare the moles of ammonia and nitrogen.

         N₂          :         NH₃

          1            :         2

         0.5        :        2/1×0.5 = 1 mol

Mass of ammonia/Theoretical yield

Mass = number of moles × molar mass

Mass = 1 mol × 17 g/mol

Mass = 17 g

Percent yield:

Percent yield = ( actual yield / theoretical yield )× 100

Percent yield =  (15 g/ 17 g)× 100

Percent yield = 88.23%

Answer:

its unbalanced  

have a great day/night

Explanation:

please mark brainlest