Help plz (will mark brainleist)

Answer:

A

Explanation:

Because it got smaller so that mean it had a chemical reaction

Answer:

+47°C

Explanation:

ΔT means change in temperature. If the change is positive, it means that heat was added and the temperature went up.

ΔT = final temp - initial temp

ΔT = 86°C -39°C = + 47°C

Answer:

A. Substance A is less soluble in water than Substance B.

Explanation:

Solubility: The term "solubility" is described as a specific property determining the capability of a particular solute, substance to get dissolve in a "solvent". Thus, solubility is being measured with respect to the "maximum amount" of a specific solute that is dissolved or mixed in a solvent at "equilibrium". After the given process, the resultant solution is referred to as a saturated solution.

In the question above, the correct answer is option-A.

Answer:

Mass =  117 g

Explanation:

Given data:

Moles of water = 6.50 mol

Mass in gram = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of water = 18 g/mol

Now we will put the values in formula.

6.50 mol = mass/ 18 g/mol

Mass = 6.50 mol×18 g/mol

Mass =  117 g

Answer:

800 g of O2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

C3H8 + 5O2 —> 3CO2 + 4H2O

Next, we shall determine the masses of C3H8 and O2 that reacted from the balanced equation. This is illustrated below:

Molar mass of C3H8 = (12×3) + (8×1)

= 36 + 8

= 44 g/mol

Mass of C3H8 from the balanced equation = 1 × 44 = 44 g

Molar mass of O2 = 16 × 2 = 32 g/mol

Mass of O2 from the balanced equation = 5 × 32 = 160 g

From the balanced equation above,

44 g of C3H8 reacted with 160 g of O2.

Finally, we shall determine the mass of O2 needed to react with 220 g of C3H8. This can be obtained as follow:

From the balanced equation above,

44 g of C3H8 reacted with 160 g of O2.

Therefore, 220 g of C3H8 will react with = (220 × 160)/44 = 800 g of O2.

Thus, 800 g of O2 is needed for the reaction.

Answer:

Salt

Explanation:

It has all -

Answer:

=8 atoms

Explanation:

In (NH4)2C2O4 there are four moles of Hydrogen in the compound (NH4), but there two molecules of (NH4) in this compound.  That's what the 2 in (NH4)2 means, so multiply 4 x 2 = 8.

Hope this helps (:

✅Paraphrasing and summarizing .✅

IamSugarBee

Answer: Yes

Explanation:

Different force on earth such as wind ocean currents etc make the rocks in earth crests to be change in their shape and size and they moves to different plates.

Rock cycle is the process by which rocks are transforming from one type to the other by the action of wind, water etc.The land is eroded and shaped by wind, water, and ice.

The landscape is dramatically and frequently violently altered by volcanic activity and earthquakes. And over a much longer period of time, the shifting of the earth's plates gradually rearranges the continents and oceans.

These mechanisms all have an impact on the Arctic and Antarctica. We'll go through each in general and in relation to the polar areas specifically.

The three main causes of erosion, or the carrying away of rock, silt, and soil, are wind, water, and ice. Weathering, or the physical or chemical degradation of the minerals in rock, is separated from erosion.

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Answer:

A

Explanation:

rest are nonmetals and they are not shiny

Answer:

Magnesium Oxide (MgO) has a higher melting point than Sodium Chloride (NaCl) which is around 2,800 degrees Celcius. This is because its Mg2+ and O2- ions have a greater number of charges, and so form stronger ionic bonds, than the Na+ and Cl– ions in Sodium Chloride.

+1

If sodium loses an electron, it now has 11 protons, 11 neutrons, and only 10 electrons, leaving it with an overall charge of +1. It is now referred to as a sodium ion.

Answer:

D

Explanation:

Answer:

Q = -2090 J

Explanation:

Given that,

Mass, m = 50 g

Water is cooled from 70°C to 60°C.

We need to find how many heat energy are released. Heat released is given by :

[tex]Q=mc\Delta T[/tex]

c is the specific heat of water, [tex]c=4.18\ J/g-C[/tex]

Putting all the values,

[tex]Q=50\times 4.18\times (60-70)\\\\Q=-2090\ J[/tex]

So, the heat energy released is 2090 J and negative sign shows heat is released.

Answer:

it is 2,100J

Explanation:

Answer:

150000 degrees

Explanation:

Answer:

false

Explanation:

jk true

Answer:

D

Explanation:

Seeing the Lewis formula for each of the molecules, we can attempt to write the condensed structural formula for each.

What we notice is that while there are purely single bonds between the carbon atoms in the first molecule, there is a double bond in the second molecule and a triple bond in the third

What we can deduce from this is that these are alkanes , alkenes and alkynes

The alkynes have the strongest of the three bonds and thus they have the strongest bonds in the mix

Since molecule 3 is an alkyne, then we can say that it has the strongest of the bonds

The correct claim about the molecules that best supports the diagrams is :

( D ) The strongest carbon to carbon bond occurs in molecule 3  

The first molecule ( molecule 1 ) is an alkane because the molecule is made up of only single bonds connecting the carbon atoms.

while the second mole ( molecule 2 ) is an alkene because of the presence of a double bond connecting carbon atoms.

and the third molecule ( molecule 3 ) is an alkyne because of the presence of a triple bond connecting carbon atoms.

Therefore  Alkynes have the strongest of of bonds between its carbon atoms  because of the presence of a triple connecting carbon atoms.

Hence we can conclude that The strongest carbon to carbon bond occurs in molecule 3

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Answer:

Gay-Lussac's law.

Explanation:

According to Gay-Lussac's pressure law, it states that the pressure of a given mass of gas is directly proportional to the absolute temperature of the gas, the assumption that the volume is kept constant.

Hence, the trucker's tires were blown up because they were under high pressure as he drove from New Jersey to California, as a result of this intense pressure the temperature of the air in the tires began to rise and it directly affected the pressure of the gas in the tires' tubes which also increased to a point that they ended up blowing out, obeying Gay-Lussac's law.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 125 mL = 125 cm³

density = 4.51 g/cm³

We have

mass = 125 × 4.51

We have the final answer as

Hope this helps you

Answer:

Gravitational energy, electric energy, magnetic energy, nuclear energy, thermal energy, chemical energy.

Explanation:

gravitational energy - the energy resulting from the attraction of two masses to each other

electric energy - energy from a static or moving electrical charge.

magnetic energy - energy from the attraction of opposite magnetic fields, repulsion of like fields, or from an associated electric field

nuclear energy - energy from the strong force that bonds protons and neutrons in an atomic nucleus

thermal energy - also called heat, this is energy that can be measured as temperature. It reflects the kinetic energy of atoms and molecules

chemical energy - energy contained in chemical bonds between atoms and molecule

mechanical energy - the sum of the kinetic and potential energy

radiant energy - energy from electromagnetic radiation, including visible light and x-rays (for example)

Answer:

C4H8

Explanation:

First find the molar mass of CH2;

2(1.01) + 1(12.01) = 14.03g

Now divide the molar mass of the compound by the molar mass of CH2;

56g/14.03g = 3.9914 Round to nearest whole number = 4

Multiply CH2 by 4 to get the molecular formula;

CH2* 4 = C4H8

Answer:

C4H8

Explanation:

calculate the amount of grams each formula turns out to be

C5 = 60.05g  well C5 is already larger than 56g so its not A

C4= 48.04g and H8= 8.08g, 48.04 + 8.08 = 56.12 so this is really close to our answer

C3 = 36.03g and H6= 6.06g, 36.03 + 6.06 = 42.09

C2 = 24.02g and H4 = 4.04g, 24.02 + 4.04 = 28.06

so the answer would be C4H8

Answer: The answer would be 158,200

Answer:

C. sorry i am late :)

Explanation:

During photosynthesis, plants intake carbon dioxide from the air and releases oxygen. Thus, they are providing enough oxygen available for humans to breath.

Photosynthesis is a bio-chemical process by which green plants produces chemical energy with the aid of light energy absorbed by chlorophyll. Photosynthetic reaction is the combination of carbon dioxide and water giving molecular oxygen and glucose.

Through photosynthesis, the amount ox oxygen and carbon dioxide in the atmosphere is balanced. This balancing cycle involves respiration of animals also.

The carbon dioxide that we exhale are up taken by plants and converts to oxygen gas. This makes sufficient oxygen for all animals to breath. Therefore, photosynthesis is a stage in carbon cycle and oxygen cycle.

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Answer:

when lit, the atoms of different chemical compounds inside the firework absorb energy, when the electrons fall back to lower energy levels, they give off colored light. Depending upon the chemical used, different colors are produced. neon lights or signs are glass tubes filled with neon gas. When the light is plugged in, the electrical energy causes the electrons of neon to jump to higher energy levels, when they go to lower levels, colored light is given off. The neat thing is that the neon never gets used up. The only thing that gets used up is the electricity. The electrons don't get destroyed and can be used over and over again jumping levels. Neon glows with an orange light, but you know that neon signs can be lots of different colors. The variations come when different gases other than neon are used such as argon, or krypton or when the tube is painted so that with the light produced it produces a certain color.

Explanation:

After being excited by high levels of electrical energy (as in neon signs) or heat energy, various elements and molecules will emit their own specific colors of light.

Metals burn in a variety of colors. When a copper compound is lit, for example, the flame is blue-green.

Calcium burns red, while potassium burns purple. Metals are combined to produce various colors in fireworks.

The appearance of each firework is determined by the type of stars it contains, as well as the size and quantity of these pellets.

Some stars contain metal salts, which produce brilliant colors, while others contain a variety of chemical compounds that produce dazzling light effects such as strobing, sparkling, and others.

Various elements and molecules will emit their own specific colors of light after being excited by high levels of electrical energy (as in neon signs) or heat energy (as in the fireworks).

Thus, the neon signs or fireworks provide different colors.

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