1. The force that pulls the atmosphere toward Earth

Answer:

Explanation:

30+38

so this is the isosotope of Zn  that weighs 68

-so Zn68

Answer:

An Atom

Explanation:

This is the smallest unit which still has the properties of an element.

Answer:

the molecular structure of y shows that it is solid

Explanation:

because in solid state atoms are tightly packed and they are attached to them closely

Answer:

An EL mechanism

Explanation:

I looked this up, it's called an EL mechanism

Answer:

A gasss

Explanation:

they have enough kinetic energy that the effect of the intermolecular forces is small and they are spaced very apart from each other

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Answer:

When NaCl is dissolved in water, it dissociates into Na+ and Cl− . These ions can be attracted strongly to the partial negative end and partial positive end of the water molecule.

Explanation:

Hence, the major intermolecular forces that contribute to the dissolution of NaCl in water are ion-dipole forces.

Answer:

id say oxigan

Explanation:

i dont realy know but if im rong correct me

Answer:

Oxygen

Explanation:

Sound energy vibrates atoms andecause of this phenomenon, sound moves at a higher speed through solids than through liquids. Sound moves at its slowest speeds through gases.   molecules of matter as it travels through a medium. The more tightly packed the particles of a medium, the faster sound energy will transfer through it.

This problem is stating a situation in which a solid object is fully immersed in a liquid and the buoyant force is larger that its weight, so that you need to discuss whether this is possible or not.

In general terms, it is necessary to keep in mind that when the buoyant force is larger than its weight, the object will float. On the other side, when the buoyant force is smaller than the weight, then the object will sink.

It means that it could be possible to have this scenario under specific conditions. Now, the Archimedes' principle can be applied with the following version:

[tex]F_B+W>m_{obj}*a\\\\\rho _{fluid}*V*g+m_{obj}*g>m_{obj}*a\\\\\rho _{fluid}*V-m_{obj}>m_{obj}*a[/tex]

It means that the object can move down the liquid if has a significant acceleration (could be external), even when the buoyant force is larger than the weight

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Answer: 1000 kg * m / s

Explanation:

momentum is equal to mass times velocity!

50 times 20 is

1000

so momentum is 1000 kg * m/s

Answer: D is mostly empty space

Explanation: Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. Found this with his gold foil experiment

Answer:

B

Explanation:

Answer:

V1/T1 = V2/T2

we must convert temperature from °c to kelvin

so T1= -20+273.15=253.15

and T2 = 60 +273.15= 333.15

0.215/253.15= V2/333.15

V2= 0.28L

hence, volume increases a little bit

electrostatic force

Explanation:

In ionic bonds one atom is positively charged (the atom that gives its electrons), and the other atom is negatively charged (the atom that receives the electrons); therefore, it is the opposite charge of the ions that attracts them to one another and holds them together with electrostatic force.

Answer: C. the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets

The Bergeron process causes cloud droplets to grow because,  the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets.

Physical transformations from a cloud of extremely small droplets to much bigger precipitation-sized particles that fall to the earth require a number of intricate and poorly understood physical processes.

The process of collision and coalescence, in which colliding droplets expand by merging together or coalescing, is how droplets form in warm clouds, those that solely contain liquid water.

Larger droplets pass through tiny droplets more quickly because they descend at a faster rate than the smaller ones. Strong updrafts (rising air currents) can produce cloud raindrops, just like hail, since they let heavier drops to stay suspended in the cloud.

Bergeron's process causes precipitation-sized particles to develop in cool clouds. Hence, option C is correct.

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Answer: the answer is molecules

A molecule is the smallest particle of a covalent compound that still has the properties of the compound.

Taking into account the definition of calorimetry, sensible heat and latent heat,  the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .

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

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

In this case:

In firts place, you know that the melting point of water is 0°C. So, first of all you must increase the temperature from -25° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).

The amount of heat a body receives or transmits is determined by:

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:

Q1= 2.03[tex]\frac{J}{gC}[/tex] × 49.3 g× 25 °C

Solving:

Q1=2501.975 J=2.501975 kJ≅ 2.50 kJ

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing:

Q2= 49.3 g× ΔHfus

Similar to sensible heat previously calculated, you know:

Replacing:

Q3= 4.18[tex]\frac{J}{gC}[/tex] × 49.3 g× 44.7 °C

Solving:

Q3= 9211.5078 J=9.2115078 kJ≅ 9.21 kJ

The total heat required is calculated as:

Total heat required= Q1 + Q2 + Q3

Total heat required= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. This is, the total heat required is 28.23 kJ. Then:

28.23 kJ= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Solving:

28.23 kJ= 11.71 kJ + 49.3 g× ΔHfus

28.23 kJ- 11.71 kJ = 49.3 g× ΔHfus

16.52 kJ = 49.3 g× ΔHfus

16.52 kJ ÷ 49.3 g= ΔHfus

0.335091[tex]\frac{kJ}{g}[/tex]= 335.091 [tex]\frac{J}{g}[/tex] =ΔHfus

In summary, the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .

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Answer:

Electrical- light + heat

Explanation:

By turning on the light Electricity energy takes place which gives us light energy which generates heat

Answer:

Chlorine  Cl atomic # 17, atomic mass 35.453

Explanation:

My atomic mass is 35.453

Dmitri  Mendeleev discovered the Periodic Table using atomic mass

look  at your  periodic table

only ONE element has an atomic mass of 35.453

Chlorine  Cl atomic # 17, atomic mass 35.453

Answer:

34 grams of carbon is approx. 2.833 moles

Explanation:

The candy coating of the M&M is made of sugar and colored dye. When water comes into contact with the sugary coating, the positive and negative charges in the water molecules pull on the negative and positive charges in the sugary coating, and the coating dissolves.

Answer:

The answer should be C.

Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.

Explanation:

Physical changes can occur to a substance without changing the chemical properties.

For example:

If you change your hair color, your personality would not change as well. So you are right, it is C!

Hope this helps!

Answer:

Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide

Answer:

volume

Explanation:

Answer:

b it controls the entry and exit of substances

The pH value will be equal to 3.29 at the equivalence point.

Titration is the laboratory method that is performed to determine the concentration of the analyte. An indicator is used to know the equivalence point.

Given the concentration of HBr = 0.12 M

The concentration of ammonia = 0.12 M

The value of Kb for ammonia = 1.8 ×10⁻⁵

The chemical reaction is :[tex]NH_3 + HCl \longrightarrow NH^+_4 + Cl^-[/tex]

For the ammonia:      NH₃     NH₄⁺          H⁺

Initial conc.:               0.12 M     ----          -----

Change:                      - x            + x          +x

At equilibrium:         0.12-x           x            x

The acid dissociation constant :[tex]K_a =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]

[tex]\frac{K_w}{K_b} =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]

[tex]\frac{1\times 10^{-14}}{1.8\times 10^{-5}} =\frac{(x)(x)}{(0.12-x)}[/tex]

[tex]5.56\times 10^{-10}=\frac{x^2}{0.12-x}[/tex]

x² + 5.56× 10⁻⁵ x- 46.33 × 10⁻¹⁰ = 0

x = 4.57 × 10⁻⁵

The concentration of hydrogen ions = 4.57 × 10⁻⁵

The pH value = - log [H⁺]

pH = -log [4.57 × 10⁻⁵]

pH = 3.29

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Answer:

Friction

Explanation:

the resistance that one surface or object encounters when moving over another.