HELP ME OUT PLS!!!!!!

During the first half of the lunar cycle, the amount of light visible to Earth gets larger and larger. During this half of the cycle, the moon is said to be:

O eclipse

O rotation

O waning

O waxing​

The Pacific Ocean is the largest ocean in the world based on water volume, totaling some 660 million cubic kilometers and is almost equally divided into the North and South Pacific waters.

Molecules are always in constant random motion due to the possession of energy. The thermal energy is the total kinetic energy of all molecules in a system.

The term entropy refers to the degree of disorderliness in a system. We shall now match each term with its appropriate description.

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Answer:

Gravity is the force that holds everything in the universe together.

Hope that helps!

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[tex]\small\mathbb\red{physical \: properties \: of \: potassium}[/tex]

1) potassium are soft silvery white metal with a Boling point of 63°C (145°F) and a boling point are 770°C (1,420°F)

2) It's density is 0.862 grams per cubic centimeter less than that of water (1.00 grams per cubic centimetrer that potassium metal float in water

[tex]\small\mathbb\green{physical \: properties \: of \: vanadium}[/tex]

1) vanadium is a silvery white, ductile, metallic looking solid. they capable of the being drawn into a thin wires

2) It melting point Is about 1,900°C (3,500°F) and its boiling point is about 3,000°C (5,400°F). the density is 6.11 grams per cubic centimeter

[tex]\small\mathbb\orange{hope \: it's \: helpful \: to \: you}[/tex]

The mass, in grams of BaCrO4 that will be produced, according to the illustration, would be 0.1329 grams

From the equation of the reaction:

Ba(NO3)2 + (NH4)2CrO4 → BaCrO4 + 2(NH4)NO3

The mole ratio of the reactants is 1:1.

Mole of (NH4)2CrO4 = 3.86/1000 x 0.716

                                       = 0.0028 moles

Mole of Ba(NO3 )2 = 2.76/1000 x 0.19

                               = 0.0005 moles

Thus, Ba(NO3 )2 is limiting in availability.

Mole ratio of Ba(NO3 )2 and BaCrO4  = 1:1

Mole equivalent of BaCrO4  = 0.0005 moles

Mass of 0.0005 moles BaCrO4  = 0.0005 x 253.37

                                                        = 0.1329 grams

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The oxidation and reduction half reactions are

Mg(s) → Mg²⁺(aq) + 2e⁻

and

Ni²⁺(aq) + 2e⁻ → Ni(s)

respectively

From the question, we are to write the half reactions for the oxidation and reduction taking place

The given reaction is

Mg(s) + NiSO₄(aq) → MgSO₄(aq) + Ni(s)

To write the oxidation and reduction half reactions, first we will write the ionic equation for the reaction.

The ionic equation for the reaction is

Mg(s) + Ni²⁺(aq) → Mg²⁺(aq) + Ni(s)

Recall:

Oxidation is the loss of electron(s) while reduction is the gain of electron(s)

Therefore,

The oxidation half reaction is

Mg(s) → Mg²⁺(aq) + 2e⁻

and the reduction half reaction is

Ni²⁺(aq) + 2e⁻ → Ni(s)

Hence, the oxidation and reduction half reactions are

Mg(s) → Mg²⁺(aq) + 2e⁻

and

Ni²⁺(aq) + 2e⁻ → Ni(s)

respectively.

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Answer:

Explanation:

C

On this particular case, both heat and work are applied to the system, so both signs are positive.

We define Q as the heat, and W as the work, such that, by the first law of thermodynamics, we know that:

change in energy = Q + W.

In this case, we have a cup of water which is placed in a microwave oven, so this is a reservoir that gives heat to our system. Then Q is positive (because the heat is being applied to the system).

On the work side. If we do work on the system, the sign is positive. If the work is done by the system, the sign is negative

In this case, the work is applied to the system (as it rotates on the plate), thus the sign of the work is positive.

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Answer:

When it rains in my backyard, the rain carries the soil to the edge of my backyard near the fence and creates a huge mud puddle.

Explanation:

Answer:So, when a reactant gets used up, its concentration decreases, and so the total reaction rate decreases. As you can see here, more products equal less reagents (reactants), and so the reaction rate decreases.

Explanation: i hope this helps!! :)))

Answer:

Explanation:

In North America, 96% of people have safely managed drinking water, and the World on average has 74% of people with access to safely managed drinking water. 96-74=22% difference.

An unbalanced force results when the sum of all forces is unequal and causes the object to displace.

Unbalanced forces occur when the force applied in one direction exceeds the force applied in the opposite direction.

When unbalanced forces act on an object, the speed and/or direction change.

When the forces acting on an object are out of balance, they do not cancel each other out.

When an unbalanced force acts on an object, the object's motion changes. The object's speed (whether increasing or decreasing) or direction may change.

Unbalanced forces are caused by a forward force (or thrust) and a frictional force opposing each other.

Friction is an opposing force to motion. It occurs whenever two surfaces rub against each other.

Thus, it is unequal force that results in movement of the object.

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Answer:

Science textbooks around the world have become suddenly out of date. Four new chemical elements have been added to the periodic table. A big decision now lies ahead - elements 113, 115, 117 and 118 need to be given their official names and symbols.

New elements can be named after a mythological concept, a mineral, a place or country, a property or a scientist. The names have to be unique and maintain "historical and chemical consistency" . This means a lot of "-iums".

"They're Latinising the name," explains chemist Andrea Sella of University College London. "The most recent tradition has been to name them after places or after people." The places chosen tend to be where the element was discovered or first manufactured. The Swedish village of Ytterby has managed to get four named after it (ytterbium, yttrium, erbium and terbium).

No-one has yet named an element after themselves but many elements are named in tribute to important scientists. Albert Einstein was given einsteinium. This can also be a way of righting the wrongs of the past. "Lise Meitner was really the chemist who spotted nuclear fission but she was never really recognised for it because she was Jewish and a woman," says Sella. "To be able to give an element a name that reminds us of her is I think greatly important."

The naming process isn't quick. The scientists who discovered them will start things off by proposing a name. But it will be down to the International Union of Pure and Applied Chemistry (IUPAC) to approve it. A special division of the US-based group has to accept the proposal. There is then a public review period of five months before the IUPAC council gets the final approval. Once it's ready, the name is announced in the scientific journal Pure and Applied Chemistry .

Scientists sometimes get creative. Mythical names have proved popular. Promethium was named after a character from a Greek legend who stole fire from the gods to give to humans and was punished by being chained to rock so an eagle could feed on his liver. The name was meant to reflect the fact that synthesising new elements often requires sacrifice.

There is hidden meaning in the table - as in the naming of praseodymium and neodymium. They replaced didymium - wrongly thought to be an element but in fact a mixture of the two. "The reason I like them is because they're called the green twin and the new twin," says Sella. "Didymium was named after [the Greek for] twin but in fact it also means testicles."

Naming an element is not just about functionality. "There's a tremendous romance to this," he adds. "Names are always important."

If I were given a food sample in powdered form I would determine the food class of the food sample by adding some water to it. By adding water to the Powder the nature of the the food can be easily determined based on the solubility of the Powder in water.

Answer:

Electromagnetic

Explanation:

Hope this helps

Answer:

1. Mechanical energy

2. Thermal energy

3. electric energy to mechanical energy

4. electrical energy to light

5. electric energy into sound energy and radiant energy

Explanation:

Answer:

2C⁸H¹⁸+ 25O² => 16CO² + 18H²O

It can also be written as;

C⁸H¹⁸ + 25/2 O² => 8CO² + 9H²O

Answer:The Qin Dynasty established the first empire in China, starting with efforts in 230 B.C., during which the Qin leaders engulfed six Zhou Dynasty states. The empire existed only briefly from 221 to 206 B.C., but the Qin Dynasty had a lasting cultural impact on the dynasties that followed.

Capital of Qin Dynasty

The Qin region was located in modern-day Shaanxi province, north of the Zhou Dynasty territory - Qin served as a barrier between it and the less civilized states above it. The capital of the Qin Dynasty was Xianyang, which was extensively enlarged after Qin dominance was established.

Qin itself had been considered a backwards, barbarian state by the ruling Zhou Dynasty. This distinction had to do with its slow pace in embracing Chinese culture, for instance, lagging behind the Zhou in doing away with human sacrifice.

The ruling class of Qin nonetheless believed themselves to be legitimate heirs to the Zhou states, and through the centuries they strengthened their diplomatic and political standing through a variety of means, including marriage.

Shang Yang

It was during the rule of Duke Xiao from 361 to 338 B.C. that the groundwork was laid for conquest, primarily through the work of Shang Yang, an administrator from the state of Wey who was appointed Chancellor.

Shang Yang was a vigorous reformer, systematically reworking the social order of Qin society, eventually creating a massive, complicated bureaucratic state and advocating for the unification of Chinese states.

Explanation:

In general, if you double the temperature you double the reaction rate. However, this does not mean the activation energy is cut in half

Answer:

A

Explanation:

When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Therefore, the correct option is option A.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. The temperature at which a substance in the liquid state freezes is the same as the temperature at which the substance melts.

Therefore, the correct option is option A.

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The volume (in mL) of 0.242 M NaOH solution needed for the titration reaction is 39.44 mL

CH₃CH₂COOH + NaOH —> CH₃CH₂COONa + H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(0.204 × 46.79) / (0.242 × Vb) = 1

Cross multiply

0.242 × Vb = 0.204 × 46.79

Divide both side by 0.242

Vb = (0.204 × 46.79) / 0.242

Vb = 39.44 mL

Thus, the volume of NaOH needed for the reaction is 39.44 mL

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