The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? O The molecules move more quickly and their average kinetic energy increases. O The molecules move more slowly and their average kinetic energy decreases O The molecules move more quickly and their average kinetic energy decreases. O The molecules move more slowly and their average kinetic energy increases.​

Answer: An indicator is itself a weak acid or weak base but a special one. The colour of the acid form is different from the colour of the base form. So you can tell when the pH of your solution has changed from being one to the other by seeing the colour change from one to the other. The particular pH where that colour change occurs depends on the particular indicator you use. The most common indicator in UG Chem Labs is probably the one called Phenolphthalein when it has its proton attached, it is colourless like water but when the proton comes off it is pink. This change happens around pH=8–9. any solution with pH below that (acidic) will make the phenolphthalein hold onto its proton and be colourless. Any pH above that will cause it to lose its proton and become pink.

Explanation:

Answer:

C

Explanation:

inertia

inertia is the reluctance of an object at rest or moving to change its state of rest or motion

because the car was moving, the dummy moves with the speed of the car..so when the crash happened the dummy continued to move..it was feeling reluctant to come to rest so was moving

Answer:

30 positive charged protons

Answer: this might have something to do with the pancreas

Explanation:

the pancreas produces insulin if subject a produces more insulin than subject b the reaction to the glucose will be different the pancreas breaks down the glucose into sugar and protiens hope this helps

Answer:

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Explanation:

Answer:

The heat capacity measures the amount of heat necessary to raise the temperature of an object or system by one degree Celsius.

LEARNING OBJECTIVES

Explain the enthalpy in a system with constant volume and pressure

KEY TAKEAWAYS

Key Points

Heat capacity is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. It is measured in joules per Kelvin and given by.

The heat capacity is an extensive property, scaling with the size of the system.

The heat capacity of most systems is not constant (though it can often be treated as such). It depends on the temperature, pressure, and volume of the system under consideration.

Key Terms

Answer:

Hydrogen (H)

Helium (He)

Lithium (Li)

Beryllium (Be)

Boron (B)

Carbon (C)

Nitrogen (N)

Oxygen (O)

Explanation:

that's the main ones I know

Answer:

H,He,Li,Be,B,C,N,O,F,Ne,Na,Mg,Al,Si,P,S,Cl,Ar,K,Ca,Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn...

Explanation:

H stands for hydrogen

He stands for helium

Li stands for lithium

Be stands for beryllium

B stands for boron

C stands for carbon

N stands for nitrogen

O stands for oxygen

F stands for fluorine

Ne stands for neon

Na stands for sodium

Mg stands for magnesium

Al stands for aluminum

Si stands for silicon

P stands for phosphorus

S stands for sulfur

Cl stands for chlorine

Ar stands for argon

K stands for potassium

Ca stands for calcium

Sc stands for scandium

Ti stands for titanium

V stands for vanadium

Cr stands for chromium

Mn stands for manganese

Fe stands for iron

Co stands for cobalt

Ni stands for nickel

Cu stands for copper &

Zn stands for zinc

HOPE THIS ANSWER WILL HELP YOU!!!

Answer:

9 atoms

Explanation:

Ca=1

Cl=2

O=6

add them all

answer

cl atom is 2

ca atom is 1

o atom is 6

Answer:

idvd has a very high performance and a lot more than just the right side to get it all out

Answer:

[tex]V_2=0.5L[/tex]

Explanation:

From the question we are told that:

initial Volume [tex]V_1=2.00L[/tex]

initial Pressure [tex]P_1=1 atm[/tex]

Final  Pressure [tex]P_2=6atm[/tex]

Generally the equation for Final Volume V_2 is mathematically given by

Since Boyle's law states

 [tex]P_1V_1=P_2V_2[/tex]

 [tex]V_2=\frac{P_1V_1}{P_2}[/tex]

 [tex]V_2=\frac{2*1}{6}[/tex]

 [tex]V_2=0.5L[/tex]

Answer:

The molar mass of ammonium sulfate, (NH₄)₂SO₄ = 132.1 g

Explanation:

The molar mass of a compound is the mass of 1 mole of the given substance.

For a compound the molar mass of the compound is obtained by summing the product of the number of atoms and the atomic masses of the atoms present in the compound.

To calculate the molar mass of ammonium sulfate, (NH₄)₂SO₄:

Atomic masses of the elements are as follows; Nitrogen (N) = 14.0, Sulfur (S) = 32.1, Hydrogen (H) = 1.0, & Oxygen (O) = 16.0

Mass of Nitrogen present = 14.0 × 2 = 28.0 g

Mass of hydrogen present = 1.0 × 4 × 2 = 8.0 g

Mass of sulfur present = 32.1 × 1 = 32.1 g

Mass of oxygen present = 16.0 × 4 = 64.0 g

Molar mass of ammonium sulfate, (NH₄)₂SO₄ = (28.0 + 8.0 + 32.1 + 64.0) g = 132.1 g

Therefore, the molar mass of ammonium sulfate, (NH₄)₂SO₄ = 132.1 g

Answer:

See Explanation

Explanation:

Green house gases are those gases believed to be responsible for the trapping of infrared ray close to the surface of the earth. The effect of the buildup of such gases include;

1) Rise in global temperature; Greenhouse gases trap infrared rays close to the surface of the earth there by leading to a continuous rise in the temperature of the earth. This is known as global warming.

2)Climate Change; Increase in the concentration of greenhouse gases in the atmosphere leads to different patterns of climatic events. This gradual change in the pattern of climatic events is called climate change.

3)Melting of polar ice caps and flooding; Increase in the concentration of greenhouse gases and consequent increase in the earth's temperature leads to the melting of polar ice caps and subsequently flooding in various parts of the world.

Answer:

CO2 AND H2O are the products of the following reaction

Answer:

[tex]P_2=1.48atm[/tex]

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to infer this problem is about the application of the Gay-Lussac's gas law to relate the initial and final pressure and temperature as shown below:

[tex]\frac{P_2}{T_2} =\frac{P_1}{T_1\\ }[/tex]

Thus, solving for the final pressure, P2, and using the temperatures in Kelvins, we obtain:

[tex]P_2 =\frac{P_1T_2}{T_1 }\\\\P_2 =\frac{1atm*403.15K}{273.15K}\\\\P_2=1.48atm[/tex]

Regards!

Answer:

For a: The given salt is acidic in nature.

For b: The given salt is neutral in nature.

For c: The given salt is neutral in nature.

Explanation:

Salts are formed by the combination of an acid and a base. There are 3 types of salt:

For the given options:

(a): [tex]NaHSO_4[/tex]

This salt is formed by the combination of sodium hydroxide (strong base)  and the partial dissociation of sulfuric acid (strong acid). It also has a replaceable hydrogen ion which can be produced when dissolved in water. Thus, the given salt is acidic in nature.

(b): [tex]Na_2SO_4[/tex]

This salt is formed by the combination of sodium hydroxide (strong base)  and sulfuric acid (strong acid).

Thus, the given salt is neutral in nature.

(c): [tex]NH_4CN[/tex]

This salt is formed by the combination of ammonium hydroxide (weak base)  and hydrocyanic acid (weak acid).

Thus, the given salt is neutral in nature.

Answer:

because it will control the birth of a child which can happen alot being overpopulated in the country or world. It also can mange their life and create a small and happy and healthy family.Also the child can get more love and support from their parents if they have less children and it wont be a taruma for the couple as well.  because growing a child can be expensive time costly and really hard.

Explanation:

plz mark me as a brainlest a and thanks my answer

When the tectonic plates try to walk to burger king, they always bump into each other because of how close together they are. Once in a while, a tectonic plate will get so pis sed of, it will form a volcano to let out its anger.

Answer:

a. N₂O₅ + H₂O ⇒ 2 HNO₃ (pentóxido de dinitrógeno + agua ⇒ ácido nítrico)

b. Na₂O + H₂O ⇒ 2 NaOH (óxido de sodio + agua ⇒ hidróxido de sodio)

Explanation:

Tenemos que balancear, por el método de tanteo, las siguientes ecuaciones químicas.

a. En la primera reacción, el pentóxido de dinitrógeno reacciona con agua para formar ácido nítrico. Es una reacción de síntesis o combinación.

N₂O₅ + H₂O ⇒ HNO₃

Podremos obtener la ecuación balanceada si multiplicamos HNO₃ por 2.

N₂O₅ + H₂O ⇒ 2 HNO₃

b. En la segunda reacción, óxido de sodio reacciona con agua para formar hidróxido de sodio. Es una reacción de síntesis o combinación.

Na₂O + H₂O ⇒ NaOH

Podremos obtener la ecuación balanceada si multiplicamos NaOH por 2.

Na₂O + H₂O ⇒ 2 NaOH

Answer:

B. Hydrogen

Explanation:

The diagram represents particles of different elements in a crystal. The  bond holds these particles together is hydrogen bond. Therefore, option B is correct.

An intermolecular force (IMF) known as a hydrogen bond is created when an electronegative atom with a single pair of electrons and a hydrogen atom connected to a strongly electronegative atom are in proximity to another. Between molecules, there are intermolecular forces (IMFs).

When a hydrogen atom that is connected to an electronegative atom moves toward another electronegative atom nearby, powerful intermolecular forces called hydrogen bonds are produced. The hydrogen bond acceptor's electronegativity will rise, resulting in a stronger hydrogen bond.

The interaction known as hydrogen bonding, which involves a hydrogen atom sandwiched between two other atoms with a high affinity for electrons, is stronger than van der Waals forces but weaker than ionic or covalent bonds.

Thus, option B is correct.

To learn more about hydrogen bond, follow the link;

https://brainly.com/question/15099999

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Answer:

A

Explanation:

I think that is the ans but am not sure

Answer:

you me me

Explanation:

got me me

ANSWER - 6 MOLES OF IRON

Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(1)

One moles of Fe2O3 forming 2 moles of Fe

3 moles of Fe2O3 will form 2×3 = 6 moles of iron

Answer: The given factors are matched to the effect it would have on the reaction rate are as follows.

- Crushing the antacid tablet

- Using many antacid tables

- Adding a catalyst to the water

- Cooling the water during the reaction

- Adding food coloring to the water

Explanation:

When antacid tablet is crushed then there will be more number of particles available for reaction. Hence, more number of collisions will take place due to which rate of reaction increases.

Using many antacid tables will also increase the number of molecules due to which there will be more collisions. Hence, more will be it's rate of reaction.

A catalyst is defined as a substance which helps in increasing the rate of a reaction without itself getting consumed in the reaction.

Therefore, adding catalyst to the water will also increase the rate of reaction.

When water is cooled during the reaction then kinetic energy between molecules decreases due to which there will be less number of collisions. Hence, rate of reaction will decrease.

Adding food coloring will have no effect on the rate of reaction as it is only changing the color of solution and does not participate in the chemical reaction.

Thus, we can conclude that given factors are matched to the effect it would have on the reaction rate are as follows.

- Crushing the antacid tablet

- Using many antacid tables

- Adding a catalyst to the water

- Cooling the water during the reaction

- Adding food coloring to the water

Answer:

43 protons and 99 neutrons.

Explanation:

Answer: 120 mL of ethanol must be added.

Explanation:

We are given:

60% ethanol by volume

This means that 60 mL of ethanol is present in 100 mL of solution

Given volume of solution = 200 mL

Applying unitary method:

If 100 mL of solution contains 60 mL of ethanol

So, 200 mL of solution will contain = [tex]\frac{60}{100}\times 200=120mL[/tex] of ethanol

Hence, 120 mL of ethanol must be added.

Answer:

1) Pure water can conduct electricity because a small proportion of its molecules dissociate into ions . The two ions formed in water are, hydrogen ions, H +, and hydroxide ions, OH -.

2) dynamic equilibrium

Explanation:

I hope this helps!