A ball rolling down a hill is what form of energy?

Answer:

By passing the gas through lime water

Explanation:

The equation of the reaction of vinegar with  calcium carbonate in the form of marble chips is shown below;

CaCO3(s) + 2CH3COOH(aq) ---------> Ca(CH3COO)2(aq) + H2O(l) + CO2(g).

We can see from the reaction equation that the gas produced is carbon dioxide. This gas is identified by passing the gas through lime water. If lime water turns milky, then the gas is truly carbon dioxide.

Answer:

Explanation:

The objects velocity will decrease because the force is opposing its motion

Na more reactive than Cu

Given

Copper in a solution of NaCl

Required

The displacement theory

Solution

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

The voltaic series:  

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au  

The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)  

The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)

Reaction

Cu + NaCl≠

The existing copper element can not replace the sodium element, which is on the left side so the reaction will not occur.

But if it is reversed, then a reaction can occur

2 Na + CuCl2 → Cu + 2 NaCl

Answer:

The correct answer is - alkali or base.

Explanation:

The litmus paper test is used to find whether a solution is basic or acidic. In a litmus paper test, a litmus paper is a dip in a particular or desired solution that turns the color of litmus paper to red, blue, or purple based on the pH of the solution.

If the paper turns red it means the solution is acidic, in a neutral solution it turns to the purple color and if the blue color appears then it is a basic or alkali solution. The solution of baking soda turns litmus paper into blue color which means baking soda is most likely a base.

Answer:

26.34 moles

Explanation:

Answer:

2

Explanation:

According to the concept of valency, 2 moles of oxygen are needed to react with 100.0 grams of aluminum.

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.

Learn more about moles,here:

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#SPJ2

Explanation:

The reaction is given as;

SO2(g) ⇄ S(s) + O2(g) ΔH° = 297 kJ

This reaction is an endothermic reaction because of the positive value of the  ΔH°. Increasing the temperature for an equilibrium reaction with froward reaction being endothermic leads to increase in equilibrium constant (K).

Regarding equilibrium concentration;

In an equilibrium reaction, any change to the system is annuled. If there is an increase in temperature, in order to annul that, the forward reaction is favoured leading to increase in concentration of of the products and decrease in reactants.

Explanation:

Due to the positive value of the change in temperature, this is an endothermic reaction.

Since the forward reaction is endothermic, increasing the temperature increases the equilibrium constant (k).

In an equilibrium system, the position of the equilibrium will move in a way to annul the change made to the system. An increase in temperature for an endothermic reaction would favour the reaction, leading to increase in amount of products and decrease in amount of reactants.

Answer:

Explanation:

Bright half starts from a new moon day and ends on a full moon day

dark half starts from a full moon day and ends on a new moon day

Answer and Explanation:

The bright half is the side we see and the dark half is the other side.

If you're referring to the moon, the bright half starts on a new moon day and ends on a full moon, whereas on the other hand dark half starts ona full moon and ends in a new moon, kinda like cycle. There are practically the same and have no big astounding differences between them.

Answer:

The ability of an atom to attract electrons.

Explanation:

Electronegativity is the ability of an atom to attract electrons.  In a bonded pair, electrons tend to stay closer to the more electronegative atom.  Atoms become more electronegative near the top right of the Periodic Table, with the highest electronegativity being Fluorine.

Explanation:

Prior preparation is required in a location at risk of natural disasters, this includes a communication system and infrastructure aimed at protecting and educating society. Technology is extremely important for the prevention of natural disasters, through forecasting and monitoring systems it is possible to map and analyze the possible risks and anticipate them with the necessary solutions, such as removing a population from a certain location with a risk of drilling.

It is necessary for the population to be aware, understand the alerts and signals issued in case of risk and follow the guidelines of the trained authorities, in this way it is possible to mitigate the effects of natural disasters.

Answer:

It's D.

Explanation:

When the egg is not fertilized, the thick uterus lining breaks down and the blood, tissues, and the unfertilized egg come out of the vagina commonly known as menstruation. When the egg is not fertilized the menstrual cycle takes place as the egg is shredded off from the body.

Answer:

a) Chlorine Trifluoride

b) Dichlorine Heptoxide

GOOD LUCK FOR FUTURE! :)

Answer:

Ok so, I would say D) because decreasing the blood glucose is actually recycling the organic chemicals. Your body uses everything in your body, filtering out the unusable chemicals and such.

Explanation:

Science :3

Answer:

3.

D. Philippine Atmospheric, Geophysical and Astronomical Services

Administration (PAGASA)

Explanation:

4.C. 62.0 kph

3) The agency that tracks the activities of typhoon that enters PAR is; D. Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA)

4) The speed of the typhoon is; C: 62 kph

3) PAR simply means Phillipines Area of responsibility.

Now this PAR is an area located at the Northwestern Pacific and it is the place where the Philippines' national meteorological agency called Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) usually monitors the weather occurrences.

This means that the typhoons that enter PAR would also be monitored by PAGASA.

4) we are given;

Distance of Typhoon Grasya from Bislig city; d = 186 km

Time at which landfall is expected; t = 3 hours.

Formula for speed is;

Speed = distance/time

Speed = 186/3

Speed = 62 kph

Read more about activities of meteorology at;https://brainly.com/question/11857753

TB solution = 100.3315 °C

T freezing solution = -1.209 °C

Given

1.2 g glycerol

20 g water

Required

the boiling point

the freezing point

Solution

ΔTB = KB . m

ΔTF = KF . m

mass water = 20 g = 0.02 kg

Kb water = 0.51 °C/m

KF water = 1.86 °C/m

mol glycerol :

= 1.2 g : 92,09382 g/mol

= 0.013

molal  : the number of moles of solute in 1 kg of solvent  

molal of solution :

= 0.013 : 0.02

= 0.65 m

ΔTB = KB . m

ΔTB = TB solution - TB solvent  

TB solution - 100 = 0.51 x 0.65

TB solution - 100 = 0.3315

TB solution = 100.3315 °C

ΔTF = KF . m

ΔT = KF . m

ΔTF = 1.86 x 0.65

ΔTF = 1.209

T_f  = -1.209 °C

Answer:

261.3368

Explanation:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Ba(NO3)2, or 261.3368 grams.

Answer: 2 moles

Explanation:

AM of Al 27

Answer:

Explanation:

Gravity and oppositely charged particles will both experience attractive forces

Answer:

D. The flesh should return to normal after you press it.

Explanation:

The water content stored in the flesh of the fish, paired with the elasticity are both indicators of freshness, and will cause the flesh to return to normal after its been pressed.

Answer:

36

Explanation:

There are 6 Carbon atoms, 12 Hydrogen atoms, and 18 Oxygen atoms.

Answer:

A reflected ray always comes off the surface of a material at an angle equal to the angle at which the incoming ray hit the surface. In physics, you'll hear this called the law of reflection. You've probably heard this law stated as "the angle of incidence equals the angle of reflection

Explanation:

Answer: Equilibrium

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.

For a chemical equilibrium reaction, equilibrium state is achieved when the rate of forward reaction becomes equals to rate of the backward reaction which means the products are being made as quickly as reactants

Equilibrium state is the state when reactants and products are present but the concentrations does not change with time.

Answer:

monke

Explanation:

because my mum told me we are all monke

Answer:

1+2 = 12

Explanation:

this is a math equation, not a chemical formula