Energy is involved in some way in all chemical reactions. Which type of reaction involves the absorption of energy from the surroundings? Options: exothermic reactions endothermic reactions

Answer:

Subatomic particles are found inside the atom

Answer:

Mammals

Explanation:

Answer:

exothermic reaction

Explanation:

The definition of exothermic is:

describing a process that involves the release of energy into the surroundings by substances undergoing change.

Think of ex-othermic as energy exiting/ released and en-dothermic as energy entering.

Answer: it’s endothermic

Explanation:

Answer:

Technically, the name for P4o10 is Tetraphosphorus Decaoxide, but most people call it Phosphorus Pentoxide

Explanation:

Tetraphosphorus Decaoxide is a chemical compound. The molecular formula for this compound is P4o10. But, under normal conditions, it is actually a dimer of P205, which is Phosphorus (V) Oxide, or Phosphorus Pentoxide.

To solve this we must be knowing each and every concept related to chemical compound. Therefore, the name for  P[tex]_4[/tex]O[tex]_{10}[/tex]. is Tetra phosphorus Deca oxide.

A chemical substance was made up of numerous comparable molecules that are made up of atoms from multiple elements that are held together through chemical bonds. Compounds are classified into four types based on the way the component elements are kept together.

A chemical formula is a method of communicating information about the atom components that make up a specific chemical compound, using conventional acronyms again for chemical elements and subscripts to express the atomic mass involved. The name for  P[tex]_4[/tex]O[tex]_{10}[/tex]. is Tetra phosphorus Deca oxide.

Therefore, the name for  P[tex]_4[/tex]O[tex]_{10}[/tex]. is Tetra phosphorus Deca oxide.

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Answer:

all of the above

Explanation:

adams take up space they take up mass they are the basic chemical unit and matter is made of adams

Answer:

All of them except "Elements are the basic unit of atoms."

Explanation:

I took the quiz :D

Answer:

B. Creating a biodegradable trash bag.

Explanation:

Engineering is generally defined as the use of scientific principles to design or build structures such as buildings, bridges and vehicles.

Engineering is the application of science or math to solve our daily life problems. So, creating a biodegradable trash bag is an example of an engineering solution which solve the environmental-related issues.

Hence, the correct option is B.

Answer:

B, C, D

Explanation:

Polyatomic ions are ions that have more than 1 atom.

Answer:

[ 0.23 ] m KCl

Explanation:

Take a look at the attachment below,

565 grams = 565.1000

                  =0.565 kg (H20)

molar mass (Potassium Chloride),

mass of Potassium + Mass of Chloride,

39.0983 + 35.453

        =74 5513 g 1 mol

Given - 968 grams (Potassium chloride)

{  (9.68 g KCI)  }

(74.5513 g KCI mol)

0.565 kg H2O

( 0.23 mol / kg ) - about ,

solution =0.23 in KCI

  [0.23] m KCI

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Answer : Yes, a precipitate form when a solution of calcium chloride and a solution of mercury(I) nitrate are mixed together.

The net ionic equation will be,

[tex]2Hg^{+}(aq)+2Cl^{-}(aq)\rightarrow Hg_2Cl_2(s)[/tex]

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The given balanced ionic equation will be,

[tex]CaCl_2(aq)+2HgNO_3(aq)\rightarrow Ca(NO_3)_2(aq)+Hg_2Cl_2(s)[/tex]

The ionic equation in separated aqueous solution will be,

[tex]Ca^{2+}(aq)+2Cl^{-}(aq)+2Hg^{+}(aq)+2NO_3^{-}(aq)\rightarrow Hg_2Cl_2(s)+Ca^{2+}(aq)+2NO_3^{-}(aq)[/tex]

In this equation, [tex]Ca^{2+}\text{ and }NO_3^-[/tex] are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

[tex]2Hg^{+}(aq)+2Cl^{-}(aq)\rightarrow Hg_2Cl_2(s)[/tex]

Taking into account the definition of net ionic equation, a precipitate of Hg₂Cl₂ is formed when a calcium chloride solution and a mercury (I) nitrate solution are mixed.

The net ionic equation is a chemical equation for a reaction that lists only the species that participate in the reaction.

In other words, an ionic equation is a chemical equation where electrolytes in aqueous solution are written as dissociated ions. Usually this is a salt dissolved in water, where the ionic species are followed by (aq) in the equation, to indicate that they are in aqueous solution.

The balanced equation will be:

CaCl₂(aq) + 2 HgNO₃(aq) → Ca(NO₃)₂(aq) + Hg₂Cl₂(s)

where (aq) means aqueous and (s) solid.

Taking into account that:

The total ionic equation in separated aqueous solution will be:

Ca²⁺(aq) + 2Cl⁻(aq) + 2 Hg⁺(aq) + 2NO₃⁻(aq) → Ca²⁺ + 2NO₃⁻(aq) + Hg₂Cl₂(s)

A spectator ion is an ion that appears both as a reactant and as a product in an ionic equation.

Spectator ions can be either cations (positively charged ions) or anions (negatively charged ions).

When writing a net ionic equation, spectator ions found in the original equation are ignored. Thus, the total ionic reaction is different from the net chemical reaction.

In this case, Ca²⁺ and NO₃⁻ are the spectator ions because they appear unchanged in both the product and the reagent. So these ions cancel out by writing the net ionic equation and you get:

2Cl⁻(aq) + 2 Hg⁺(aq) → Hg₂Cl₂(s)

Since Hg₂Cl₂ is an insoluble salt, it will precipitate.

Finally, a precipitate of Hg₂Cl₂ is formed when a calcium chloride solution and a mercury (I) nitrate solution are mixed.

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its volume this is the answer because the mercury will turn into gas. gas has more volume because it takes up more space as it spreads.

Answer: It’s Volume

Explanation:

To solve this we must be knowing each and every concept related to crystalline solids. Therefore, crystalline solids are the solids with a repeating atomic pattern. the correct option is option B.

One form of solid-state material is crystalline solids. Solids are substances with a melting point higher than ambient temperature at atmosphere pressure. Solids are classified into two categories based just on arrangement of their constituents: amorphous solids and crystalline solids.

Crystalline solids are solids with a regular but three-dimensional arrangement of component units including such (atoms, molecules, or ions). Crystalline solids are the solids with a repeating atomic pattern.

Therefore, crystalline solids are the solids with a repeating atomic pattern. the correct option is option B.

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Answer:

C. A reaction that absorbs heat

Explanation:

I do not know Latin, but roughly speaking 'Endo' means inside, and 'thermic' means heat.

There are several types of chemical reactions, two of the important reactions are endothermic and exothermic. An endothermic reaction  absorbs heat. The correct option is C.

The chemical reaction which proceed with the absorption of heat energy is defined as the endothermic reaction. In an endothermic reaction, the system gains heat and hence the enthalpy change ΔH will be positive.

In endothermic reaction, because of the absorption of heat, the enthalpy of the products will be more than that of the reactants. An example of endothermic reaction is shown as:

N₂ (g) + O₂ (g) → 2NO (g)   ΔH = 180.5 kJ

So in endothermic reactions, the reactants absorb heat energy from the surroundings to produce the products. These reactions reduce the temperature of the surrounding area and thereby creates a cooling effect.

Thus the correct option is C.

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Answer:

1. K = [CaCO3] [H2]⁴/ [CaO] [CH4] [H2O]²

2. More products are obtained at equilibrium since the equilibrium constant is very large.

Explanation:

1. Determination of the expression for the equilibrium constant, K.

The equilibrium constant, K for a given reaction is simply the ratio of concentration of the products raised to their coefficient to the concentration of the reactants raised to the coefficient.

The balanced equation for the reaction is given below:

CaO(s) + CH4(g) + 2H2O(g) —> CaCO3(s) + 4H2(g)

Therefore, the equilibrium constant, K for the above equation is:

K = [CaCO3] [H2]⁴/ [CaO] [CH4] [H2O]²

2. From the question given, the equilibrium constant is 2344.

Since the equilibrium constant is very large, it therefore means that more product are obtained at equilibrium.

Answer:

D: potential

Explanation:

Answer:

emission at a high speed or energy which often forms electrons

Answer:

D. HCI (Hydrochloric acid)

Explanation:

correct me if im wrong but im pretty sure thats the answer

Answer:

Separating liquids in a mixture

Separating gases in a mixture

Explanation:

Chromatography is the separation of a mixture by passing it in solution or gas through a medium where the components move at different rates.

Answer:

separating liquids in a mixture

separating gases in a mixture

Explanation:

Answer:

D: chemical change

Explanation:

Answer:

If alluminium loses 1 electron Al+

If it loses 2 electrons Al++

Explanation:

Answer:

Explanation:

For one B2 molecule 3 A2 molecules are reacting means,

the ratio is  1:3

Out of 126 molecule = 126/3 =42 molecules are required for the reaction,

therefore the 54-42= 10 molcules of B2 will reamin in the  end of reaction.

Answer:

The correct option is d.

d) If ΔH and ΔS have the same sign, the temperature will determine the spontaneity

Explanation:

Consider the table attached at the bottom which shows Spontaneity and the sign of Enthalpy and Entropy terms.

We can clearly see from the table how temperature effects the Spontaneity.

If the signs of ΔH and ΔS are opposite, the spontaneity doesn't depend on the temperature.

If the signs of ΔH and ΔS are same, then the temperature effects the Spontaneity. If both have negative signs, reaction is spontaneous at low temperature. If both have positive signs, reaction is spontaneous at high temperature.

Answer:

D.

Explanation:

A pE x

The correct answer is the combination of a metal with another element.

An alloy is a combination of two or more metallic elements to make a stronger material. For instance, there are bronze alloys, brass alloys, and coin alloys.

We can confirm that an alloy is a combination of one metal with another metal  because stainless steel is made of an iron and chromium alloy (iron is a metal; chromium is also a metal). Therefore, we can confirm that option C is the best choice.

If we want to lift a 30 kg box to a height of 1 m Ans is 294 J

Explanation:

Ans is 249 J

Answer: D.) 25.9%

Explanation:

Dinitrogen pentoxide chemical formular : N2O5

Calculating the molar mass of N2O5

Atomic mass of nitrogen(N) = 14

Atomic mass of oxygen(O) = 16

Therefore molar mass :

N2O5 = (2 × 14) + (5 × 16) = 28 + 80 = 108g/mol

Percentage amount of elements in N205:

NITROGEN (N) :

(Mass of nitrogen / molar mass of N2O5) × 100%

MASS OF NITROGEN = (N2) = 2 × 14 = 28

PERCENT OF NITROGEN : (28/108) × 100%

0.259259 × 100%

= 25.925%

= 25.9%

Answer:

A

Explanation:

Answer:

A

Explanation:

In order to balance an equation,the number of atoms of elements on the right side must equal the number of atoms of the same elements on the left side.After balancing the equation,C has 1 atom on both the left and right side,H has 4 atoms each on both sides of the equation and O has 4 atoms each on both sides of the equation,hence balanced.

Answer: b. ii and iii

Explanation:

The ester, Butyl Butanoate is formed when Butanol reacts with Butanoic acid

as seen below;

CH3-CH2-CH2-CH2-OH  +  CH3-CH2-CH2-COOH     ---->

Butanol                                     Butanoic acid

CH3-CH2-CH2-COOCH2-CH2-CH2-CH3   +          H2O

Butyl Butanoate                                                      Water

Answer:

Option C. 1

Explanation:

Step 1:

Determination of the Neutron of both isotopes. This is illustrated below.

For isotope y xA:

Mass number = y

Atomic number = x

Neutron =..?

Atomic number = proton number = x

Mass number = Proton + Neutron

y = x + Neutron

Rearrange

Neutron = y – x

For isotope (y + 1) xA:

Mass number = y + 1

Atomic number = x

Neutron =.?

Atomic number = proton number = x

Mass number = Proton + Neutron

y + 1 = x + Neutron

Rearrange

Neutron = y + 1 – x

Step 2:

Determination of the difference between the neutron number of both isotopes. This is illustrated below:

For isotope y xA:

Neutron number = y – x

For isotope (y + 1) xA:

Neutron number = y + 1 – x

Difference in neutron number

=> (y + 1 – x) – (y – x)

=> y + 1 – x – y + x

Rearrange

=> y – y + 1 – x + x

=> 1

Therefore, the difference in the neutron number of both isotopes is 1

Answer:

Gold(III) chloride

Explanation:

Answer:

52.0 °C

Explanation: