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The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis. The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next.

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Answer:

20W

Explanation:

the power of qn object doing work w in a given time t is given by

p= w/t

Answer:

Potassium will donate an electron to bromine.

Explanation:

When potassium and bromine come together, the more electronegative bromine will snatch that solitary valence electron from the potassium atom. This will lead to the formation of the potassium cation, K+ , and the bromide anion, Br− .

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Answer:

Half mole or 0.5 moles

__________________________________________________________

Oxygen has a molar molar mass of 32 g.

This means that O2 will have half that amount of grams, half-mole-substance.

6.022*10^23 molecules are present in one mole of any substance, so half it for O2.

6.022 × 10²³ [tex]-- >[/tex] 3.011 × 10²³

And simplified, that would make your answer 0.5 moles.

________________________________________________________

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Answer:

1.85 g of hydrogen gas will form!

Explanation:

1. Write the balanced equation.

Zn

+

2HCl

→

ZnCl

2

+

H

2

2. Calculate the moles of

Zn

.

Moles of Zn

=

30.0

g Zn

×

1 mol Zn

65.38

g Zn

=

0.4589 mol Zn

3. Calculate the moles of

H

2

.

Moles of H

2

=

0.4589

mol Zn

×

2 mol H

2

1

mol Zn

=

0.9177 mol H

2

4. Calculate the mass of

H

2

.

Mass of H

2

=

0.9177

mol H

2

×

2.016 g H

2

1

mol H

2

=

1.85 g H

2

Explanation:

The Animal meat contains Vitamins, proteins and carbohydrates and many more,

The other food group includes various minerals, (like copper, Calcium, Sodium, Phosphorus, selenium, cobalt, iron, zinc etc) various Amino acids, Fatty acids, water and albumin

The sources of vitamin like B12 are animals, and vegetarian should consume plant based supplements to fulfill the need of essential macromolecules!

[Side note: Meat consumption is secondary cause of increasing global warming Go vegan!]

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Answer:

it is created by movement of molecules with higher energy upwards and the movement of molecules with lower energy downwards

Explanation:

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The number of moles contained in 39 L of F2 gas at STP is 1.74mol. Details on how to calculate number of moles can be found below.

The number of moles of a gas at STP can be calculated using the following formula:

PV = nRT

Where;

At STP, the following applies:

1 × 39 = n × 0.0821 × 273

39 = 22.41n

n = 1.74mol

Therefore, the number of moles contained in 39 L of F2 gas at STP is 1.74mol.

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Based on the data given, the molar mass of the gas is 165.5 g/mol while the molecular weight of the gas is 165.5 amu

The molar mass of a gas can be obtained from density, temperature and pressure using the formula below:

Molar gas constant, R = R = 0.082 L.atm/mol/K.

Temperature = 150 °C = 423 K

Pressure = 785 torr = 1.033 atm

density = 4.93 g/L

molar mass of gas = 4.93 × 0.082 × 423/1.033

molar mass of gas = 165.5 g/mol

Then, molecular weight of the gas = 165.5 amu

Therefore, the molar mass of the gas is 165.5 g/mol while the molecular weight of the gas is 165.5 amu

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Answer: Selection proper

Explanation:

it's an anti-chance process, but subject to many constraints

Answer:

Fluid power systems perform work by a pressurized fluid bearing directly on a piston in a cylinder or in a fluid motor. A fluid cylinder produces a force resulting in linear motion, whereas a fluid motor produces torque resulting in rotary motion. Within a fluid power system, cylinders and motors (also called actuators) do the desired work. Control components such as valves regulate the system.

Answer:

1) because of heating

2) because of hammering

In a chemical reaction, bonds between atoms in the reactants are broken and the atoms rearrange and form new bonds to make the products.

The atoms get rearranged into new substances.

Answer:

summers get hotter, and it can get more sticky or humid sometimes.

Explanation:

think of the seasons and the tempatures.

Explanation:

Lithium Sodium Potassium group 1

Hydrogen proton +1

Iron Fe2+

Choosing the material with the highest specific heat capacity is ideal and true.

This is defined as the quantity of heat needed to raise the temperature per unit mass.

Insulators have a higher specific heat capacity as it takes more time for them to absorb heat thereby making it ideal in building an  insulated home.

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Answer:

5

Explanation:

First find the balanced equation for this rxn

C3H8    +  5O2    ====>     3 CO2    + 4  H2O

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The correct option is option A.

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

Propane gas, C[tex]_3[/tex]H[tex]_8[/tex], burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O[tex]_2[/tex] is 5.

C[tex]_3[/tex]H[tex]_8[/tex]    +  5O[tex]_2[/tex]  [tex]\rightarrow[/tex]   3 CO[tex]_2[/tex]    + 4  H[tex]_2[/tex]O

Therefore, the correct option is option B.

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A buffer solution must contain relatively high amount of both an acid and its conjugate base dissolved in water.

A  buffer solutrion is a soltion that contains appreciable amounts of a

Buffer solutions resist any small  change in pH when small amounts of a strong acid or a strong base are added

Examples of a buffer solution is

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Answer:

10.25

Explanation:

There I proved it

Answer:

pOH = 12.10

Explanation:

pOH = 14 - pH = 14 - 1.90 = 12.10

Answer:

The Symbol Of Sodium Peroxide Is Na2O2

Answer:

Na2O2

Explanation:

Answer:

Wind pushes air parcels even higher in the troposphere, where it is colder. The air parcels will then lose more energy and more rain can happen.

Explanation:

Answer:

Wind propels air packages upward into the troposphere, which is cooler. As a result, the air packets will lose more energy and more rain may fall.

Explanation:

Answer:

C

Explanation:

A mixture of heptane and 1-propanol  easily dissolved using DEGS because diethylene glycol sussinate (C8H14O6) 1 propanol easily dilutes and retain surface.

Generally, a mixture speaks to the joining of two different substance in other to achieve a different substance or something combining or becoming matched.

In conclusion, SE-30  is  neutral in nature, DEGs is a stationary phase containing a non-volatile liquid phase. It also includes polar group OH types,

Hence, using Hydrogen bonding it can easily bind  1-propanol.

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Answer:

A. 46

Explanation:

Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell .

Answer:

D) Sea level will continue to rise

Answer:

It is called "tobacco juice"

Explanation:

When a grasshopper is picked up they spit the brownish liquid known as "tobacco juice." They use it as some sort of defense mechanism to protect them from attacks by predators.

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Answer: 23

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