can someone help me pls

Answer:

Change in energy.

Explanation:

An energy change is required to shift one state to another or do any of the other listed.

Answer:

Molecules contained in a liquid evaporate from the surface area. This means that the larger the surface area, the faster the rate of evaporation. ... This means all the other factors that affect the rate of evaporation are identical. Leave the containers for one hour.

Explanation:

Answer:

Evaporation would accelerate.

Explanation:

Direct sunlight increases the thermal energy on the containers, increasing evaporation.

Answer:

Ok...

Answer: YTH/JYG

Explanation:

AI+ZN+H=YTH

Answer:Potassium and sulfur form KS2

Sodium and calcium form Na2Ca

Beryllium and nitrogen form Be3N2

Explanation:

i took the quiz

Answer:

0.683 moles of the gas are required

Explanation:

Avogadro's law relates the moles of a gas with its volume. The volume of a gas is directely proportional to its moles when temperature and pressure of the gas remains constant. The law is:

V₁n₂ = V₂n₁

Where V is volume and n are moles of 1, initial state and 2, final state of the gas.

Computing the values of the problem:

1.50Ln₂ = 5L*0.205mol

n₂ = 0.683 moles of the gas are required

Answer:

because the sun illuminates the half of the moon that's facing it leaving the other half dark

Answer:

tsunamis

they are literally water earthquakes that force tons of water ashore and wipes out cities and towns

Answer:

In chemistry and physics, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

Answer:

MnO₂

Explanation:

Answer:

11

Explanation:

Answer:

Atomic number of sodium is 11.

Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is ²³Na. The free metal does not occur in nature, and must be prepared from compounds.

Answer:

The change in temperature for the water is 4.21 C and its final temperature is 29.21 C

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

5.78*10³ J= 4.186 [tex]\frac{J}{g*C}[/tex] *328 g* ΔT

Solving:

ΔT= [tex]\frac{5.78*10^{3} J }{4.186\frac{J}{g*C}*328 g}[/tex]

ΔT= 4.21 C

Being ΔT= Tfinal - Tinitial and Tinitial=25 C, then:

4.21 C= Tfinal - 25 C

4.21 C + 25 C= Tfinal

29.21 C= Tfinal

The change in temperature for the water is 4.21 C and its final temperature is 29.21 C

Answer:

The system can operate on a set level of parts per million (ppm) chlorine, where the set level is automatically maintained.

Answer:

True

Explanation:

Gases don't have any shape or form, so they could not be definite.

Answer: Mg is a cation and Cl is an anion

Explanation: In more detail, if you look at the periodic table, the group number (or columns) of the elements, describe how many valence electrons, or how many electrons the element has available to have a complete an electron shell. Magnesium being in group 2, it has one 2 electrons that will be "donated" to an anion that it bonds with. However, Chlorine being in group 17, (look at the single digit number for double digit groups), it has 7 valence electrons. Knowing that a full electron shell is usually 8 electrons, it needs only one. Since Magnesium has 2 valence electrons to give away, two atoms of Chlorine gas will then bind to the Magnesium, where the 2 Chlorine atoms will take the electrons to fill their shells. Magnesium Chloride, in terms of charges when in ions, [Mg]2+ and 2 [Cl]-1

Magnesium chloride is formed when magnesium ion formed from the loss of two electrons and two chloride ions formed by accepting one electron each are held together by electrostatic attractive forces.

Magnesium chloride is an ionic compound which consists of magnesium ions and chloride ions.

Therefore, magnesium chloride is formed when magnesium ion formed from the loss of two electrons and two chloride ions formed by accepting one electron each are held together by electrostatic attractive forces.

Learn more about ionic compound at: https://brainly.com/question/13690700

Answer:

The reaction is not balanced.

Explanation:

The reaction expression is given as:

     4NH₃   +   5O₂   →   4NO  +   5H₂O

In a balanced reaction equation, the number of atoms on both sides of the expression is the same.

Now let us investigate;

Elements                            N                          H                       O

Reactants                           4                          12                       10

Products                            4                           10                        9

We see that the number of H and O on both sides of the expression is not the same. The reaction is not balanced.

Answer:

Molar mass and Mass

Explanation:

The relationship between mass and number of moles is given as;

Number of moles = Mass / Molar mass

Mass = 1.6 g

Molar mass of HCl = ( 1 + 35.5 ) = 36.5 g/mol

Number of moles = 1.6 g / 36.5 g/mol

Number of moles = 0.0438 mol

Answer:

Ammonium nitrate is NH4NO3

iron(II) sulfate is FeSO4

magnesium hydroxide is MG(OH)2

titanium(II) chloride is TiCI2

cobalt(III) oxide is Co2O3

potassium sulfide is K2S

Barium acetate is C4H6BaO4

magnesium bromide is MgBr2

lithium carbonate is Li2CO3

potassium permanganate is KMnO4

Answer:

Explanation:

Answer:

dry

polar

highlands

temperate marine

temperate continental

Explanation:

Answer:

The correct answer is B. and C. according to me!

Answer:

A. and C.

no explanation...

Answer:

All of the consumers and producers eventually become nourishment for the decomposers.

Explanation:

Energy is transferred between organisms in food webs from producers to consumers. The energy is used by organisms to carry out complex tasks. The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants.

Answer: it is Not a pure substance because it consists of sodium so it would be a mixture because it contains sodium

Explanation:

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its mixture

Explanation:

phosphorus atoms has 15 electrons and 15 protons with valence 5 electron in outer shell and is highly reactive element

Explanation:

your answer is oxidation

Answer:

Oxidation

Explanation:

Answer:

chemical is fire

and ductility is physical

Explanation:

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Answer:

There are more hours of daylight at Location X than at Location Y.

Explanation:

The student has created a model in the diagram in which sun and earth are presented. There are two point location on earth one is x and other is y. The x point is declined towards the sun which means that locations on point x receives more light than location Y. There will be more hours of daylight at Location x.

The best comparison of the conditions at Location X and Location Y is there are more hours of daylight at Location X than at Location Y.

The sun is the big spherical of heat and energy. The sun gives light. The Earth is the third planet of our solar system.

Thus, the correct option is C, There are more hours of daylight at Location X than at Location Y.

Learn more about Sun and the Earth

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Answer:

Table salt, or sodium chloride (NaCl), the most common ionic compound, is soluble in water (360 g/L)

Answer: chemical change as a new product is formed

Answer:

Area = 51.74cm ² 

Explanation:

5.6 × 9.4 = 51.744

Round above answer

= 51.74

Answer:

The force of the atmosphere 200 KN.

Explanation:

Pressure is the ratio of force applied to the area  to which the force is applied.

i.e Pressure = [tex]\frac{Force}{Area}[/tex]

But, Pressure = 100000 pa (100000 N/ [tex]m^{2}[/tex]), and surface area = 2.0 [tex]m^{2}[/tex]

Thus,

100000 = [tex]\frac{Force}{2.0}[/tex]

⇒ Force = 100000 x 2.0

              = 200000

Force = 200 KN

The force of the atmosphere 200 KN.