A student has a balloon with a volume of 2.5 liters at a temperature of 20°C. As the
day warms up to 40°C the student notices their balloon changing size. What is the
new volume of the student's balloon?

Answer:

Plastic is non-reactive. It does not react with water and air. Plastic is light, strong and durable and can be moulded into different shapes and sizes. It is cheaper than metals. Plastics are poor conductors of heat and electricity and can be used for making handles of frying pans.

Explanation:

1) Einsteinium

2) Albert Einstein

Answer:

Einsteinium, Rutherfordium, Nobelium, Curium etc are some examples of elements named after scientists

Answer:

less polution

Explanation:

Answer:

Keq = 19

ΔG° = -7.3kJ/mol

Explanation:

Based on the chemical reaction:

Glucose 1-phosphate ⇄ Glucose 6-phosphate

The equilibrium constant, Keq is defined as:

Keq = [Glucose 6-phosphate] / [Glucose 1-phosphate]

Where [] are equilibrium concentrations of each substance

Replacing:

Keq = [0.19M] / [0.01M]

Keq = 19

Now, standard free energy change, ΔG° is defined as:

ΔG° = -RT ln K

Where R is gas constant 8.314J/molK

T is absolute temperature (25°C + 273.15K = 298.15K)

and K is equilibrium constant = 19

Replacing:

ΔG° = -8.314J/molK*298.15K ln 19

ΔG° = -7299J/mol

ΔG° = -7.3kJ/mol

Answer:

Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the Kinetic Energy of an object. ... Objects with greater mass can have more kinetic energy even if they are moving more slowly, and objects moving at much greater speeds can have more kinetic energy even if they have less mass

Explanation:

-plants that can absorb copper ions are grown on soil with low grade copper ores.

-the plants are burned and the copper compounds are within the Ash.

-copper ions can be leached from the Ash by adding sulphuric acid, this makes a solution of copper sulphate

-the displacement of scrap iron makes pure copper metals.

Plant Extraction (Plant Mining)

crops are grown in soil containing low-grade ore. Plants take up metal ions from the roots and concentrate these ions on the cells. The plants are harvested and burned. The remaining ash contains metal compounds.

Plants absorb metal ions from their roots in a process called plant mining. It removes toxic metals from contaminated soil-eg around old mines. In the future, when high-grade ore is depleted, it may extract metals by burning plants to produce ash.

How to extract copper from low-grade copper ore? Copper is extracted from low-grade copper ore by hydrometallurgy. Cu is treated with cast iron or H2 and leached by acid.

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Answer:

False

Explanation:

A series circuit is one that is all connected

Answer:

metalloids

Explanation:

I think that is the answer

According to the electronic configuration, group 14 of elements can act as semiconductors.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

79

Explanation:

Answer:

Genetic variation

Explanation:

measure of the genetic differences that exist within a population. 

B. "The change in"

I saw that symbol a lot in chemistry and physics so I immediately recognized it.

Answer:

O, C,  Sn, Sr

Explanation:

As per the periodic table trends, atomic radius of an atom deceases from left to right and increases down a group this is so because across a period or from left to right, number of protons increases that increases the nuclear charge and nuclear radius decreases. Down the group, atomic radius increases because energy level increases and distance between nucleus and outermost orbital increases.

The elements in order from smallest to largest atomic radius are:

O, C,  Sn, Sr because as per the periodic table trends, oxygen (O) fall into right side of Carbon (C) in the periodic table and Strontium (Sn) and Tin (Sn) fall into down the group where Tin (Sn)  is on the right side of Strontium (Sn).

Hence, the correct order is "O, C,  Sn, Sr".

The reaction is not balanced

Given

Reaction

2Fe(s)+3O₂(g)⇒2Fe₂O₃(s)

Required

The number of atoms

Solution

In a balanced chemical equation, the number of atoms in the compound that reacts (the reactants and products) will have the same number

Reactants : Fe(s)+O₂(g)

Fe = 2 atoms

O = 3 x 2 = 6 atoms

Products : Fe₂O₃(s)

Fe = 2 x 2 = 4 atoms

O = 2 x 3 = 6 atoms

The reaction is not balanced because the number of Fe atoms is not the same

The balanced reaction should be:

4Fe(s)+3O₂(g)⇒2Fe₂O₃(s)

Answer:

The negative electrodes (cathodes ) and the positive electrodes (anodes ) are made of graphite, a form of carbon. During electrolysis: positively charged aluminium ions gain electrons from the cathode, and form molten aluminium. oxide ions lose electrons at the anode, and form oxygen molecules.

Answer:

A: False

Explanation:

B: True

C: part of earths mantle.

Answer:

0.088mole

Explanation:

Given parameters:

Mass of the compound  = 5.125g

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we need first find the molar mass of the given compound.

Molar mass of NaCl  = 23 + 35.5 = 58.5g/mol

So;

 Number of moles  = [tex]\frac{mass}{molar mass}[/tex]   = [tex]\frac{5.125}{58.5}[/tex]    = 0.088mole

Answer:

0.075 moles n=m/M so divide the mass (m) by the molar mass (M) to get the n which is the number of moles

Explanation:

Answer:

number C

Explanation:

Answer:

O C4H8

Explanation:

Answer:

Hydrogen, 0,2 mol

Explanation:

[tex]V_{M}[/tex] = 22, 4 l/mol

V ([tex]N_{2}[/tex]) = 6,72 [tex]dm^{2}[/tex] = 6,72 l

V ([tex]H_{2}[/tex]) = 6,72 [tex]dm^{2}[/tex] = 6,72 l

The formula is:

n = [tex]\frac{V}{V_{M} }[/tex]

n  ([tex]N_{2}[/tex]) = 6,72l /22,4 l/mol = 0,3 mol

n  ([tex]H_{2}[/tex]) = 6,72l /22,4 l/mol = 0,3 mol (the same)

But from the equation we get a proportion that 1 mol  ([tex]N_{2}[/tex]) - 3 mol ([tex]H_{2}[/tex])

[tex]\frac{0,3}{1} > \frac{0,3}{3}[/tex] (we have more hydrogen than is need for the reaction)

So there is excess of [tex]H_{2}[/tex]

We only need  [tex]\frac{0,3}{3}[/tex] = 0,1 mol ([tex]H_{2}[/tex])

0,3 mol (hydrogen quantity we have) - 0,1 mol (hydrogen quantity we need for the reaction) = 0,2 mol (excess)

make me the brainliest

Answer:

GAY-LUSSAC'S LAW.

Explanation:

P1 = 765 torr

T1 = 23°C = 296K

P2 = 560. torr

T2 = ?

(765 torr)/(296K) = (560. torr)/ T2

T2 = 226 K = -57°C

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore the new temperature is  -57°C. the law that is used over here is Gay-Lussac's Law.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Ideal gas is only for ideal gas.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

P1 = 765 torr

T1 = 23°C = 296K

P2 = 560. torr

T2 = ?

Applying Gay-Lussac's Law

(765 torr)/(296K) = (560. torr)/ T2

T2 = 226 K = -57°C

Therefore the new temperature is  -57°C. the law that is used over here is Gay-Lussac's Law.

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Answer:

The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).

Answer:

Hydrogen Bonding

Explanation:

The solubility of ammonia is mainly due to the hydrogen bonding and not the reaction. Other common substances which are freely soluble in water because they can hydrogen bond with water molecules include ethanol (alcohol) and sucrose (sugar).

Answer:

Explanation:

Melting and boiling point variations are not clear (do not have uniform pattern) in periodic table. But we can see, some elements have higher melting and boiling points and some have less. Here we study melting and boiling points of s, p, d blocks elements. IVAth group elements (C,Si) show high melting and boiling points because they have covalent gigantic lattice structures.

When a molecule is separated into its components it forms atoms as molecules are made up of same or different kind of atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

is the process of water movement through a plant and its evaporation from aerial parts, such as leaves stems and flowers.

Answer:

well in easy terms... its just like the loss of water from the leaves or other parts of a plant due to evaporation

Explanation:

Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism.