Why are the halogen elements so dangerous in their uncombined forms?
Answer:
Halogen elements are dangerous in their uncombined forms because they are very reactive.
Explanation:
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Halogens, including such chlorine or bromine, pose an environmental and occupational risk to the lungs and other organs.
What are halogens?The halogens are a group of five or six chemically related elements in the periodic table: fluorine, chlorine, bromine, iodine (I), and astatine.
Tennessee, an artificially created element, may also be a halogen. This group is known as group 17 in modern IUPAC nomenclature.
Halogens are unique in that they have seven valence electrons, making them extremely reactive. Valence electrons are the electrons involved in chemical reactions and are contained in the outer shell.
Fluorine is one of the most reactive elements known to man. Halides are simple halogen-containing compounds. Fluorine gas is lethal. Even breathing air containing 0.1% fluorine can result in death.
Thus, the halogen elements so dangerous in their uncombined forms.
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give the number of protons and neutrons in the nucleus of the following atoms
when an element has 238 mass number and 92 atomic number give the number of protons and neutrons in the nucleus
The number of protons and neutrons in the nucleus : 92 and 146
Further explanationGiven
Mass number = 238
Atomic number = 92
Required
Protons and neutrons
Solution
Mass number=number of protons + neutrons
Atomic number=number of protons=number of electrons
Atomic number = 92⇒number of protons=92
Number of neutrons = mass number - atomic number
Number of neutrons = 238 - 92 = 146
Which form of energy does a plant store when light is transformed during photosynthesis?
A.chemical energy
B.thermal energy
C.mechanical energy
D.electrical energy
Answer:
A. chemical energy
Explanation:
3) Hubba Bubba Bubble gum
was $0.25 thirty years ago.
Today it costs $1.39. What is
the percent increase? Round
to the nearest hundredth (if
necessary).
tock
2.07
Explanation:
1.39/0.25 * 100% = 5.56%
Donde están ubicados los componentes básicos de una reacción química
Las sustancias a la izquierda de la flecha en una ecuación química se denominan reactivos. Un reactivo es una sustancia que está presente al comienzo de una reacción química. Las sustancias a la derecha de la flecha se denominan productos.
A spray can is used until it is empty except for the propellant gas, which has a pressure of 1307 torr at 23°C. If the can is thrown into a fire (T = 477°C), what will be the pressure (in torr) in the hot can
Answer:
[tex]P_2=3312torr[/tex]
Explanation:
Hello!
In this case, since here we have a pressure-temperature relationship, we need to use the Gay-Lussac's law in order to compute the final pressure as they are in a directly proportional relationship:
[tex]\frac{P_2}{T_2} =\frac{P_1}{T_1}\\\\P_2= \frac{P_1T_2}{T_1}[/tex]
Now, we plug in the given pressure and temperatures in Kelvins to obtain:
[tex]P_2= \frac{1307torr*(477+273)K}{(23+273)K}\\\\P_2=3312torr[/tex]
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During ionic bonding, there is a transfer of electrons...
O from one metallic element to a different metallic element
O from one nonmetallic element to a different nonmetallic element
O from one metallic element to a different metalloid
O from one metallic element to a different nonmetallic element
Answer:
from one metallic element to a different nonmetallic element
Explanation:
For example NaCl is ionic compound in which Na metal donate electron to Cl non metal
Can someone help with part B asap
Well, simply put,
There is no Hydrogen Chloride being produced from this reaction, but instead it's Ammonium Chloride.
How many copper(I) ions (atoms of Cu 1+ ) are in a sample of copper(I) sulfate that weighs 35.4 grams?
Answer:
copper has 2+ ions in a sample of copper
A student rubbed a plastic comb with a piece of silk cloth. She held the comb near running water and saw that the stream of
water moved toward the comb.
Why did the stream of water move toward the comb?
A Rubbing the comb caused it to get hot so it repelled the water.
O B. Rubbing the comb caused charges to build up, so it repelled the water.
C. Rubbing the comb caused it to become magnetized, so it attracted the water.
O D. Rubbing the comb caused static electricity to build up, so it attracted the water.
Answer:
c
Explanation:
c
Answer:
Rubbing the comb caused static electricity to build up, so it attracted the water.
3 common uses for salt
Answer:
Salt has long been used for flavoring and for preserving food. It has also been used in tanning, dyeing and bleaching, and the production of pottery, soap, and chlorine. Today, it is widely used in the chemical industry.
How many atoms of each element are in NH3 and CH4
Answer:N-1
H-3
C-1
H-4
Explanation:Nitrogen-1,Hydrogen-3(Ammonia),Carbon-1,Hydrogen-4(Methane).
Calculate the maximum
mass of magnesium oxide
that can be made from
2.4g of magnesium and
2.4g of oxygen.
1
1
2Mg + 0, → 2Mgo
Answer:
Mass = 3 g
Explanation:
Given data:
Mass of magnesium = 2.4 g
Mass of oxygen = 2.4 g
Mass of magnesium oxide formed = ?
Solution:
Chemical equation;
2Mg + O₂ → 2MgO
Number of moles of oxygen:
Number of moles = mass / molar mass
Number of moles = 2.4 g/ 32 g/mol
Number of moles = 0.075 mol
Number of moles of magnesium:
Number of moles = mass / molar mass
Number of moles = 2.4 g/ 24 g/mol
Number of moles = 0.1 mol
now we will compare the moles of magnesium oxide with both reactant.
Mg : MgO
2 : 2
0.075 : 0.075
O₂ : MgO
1 : 2
0.1 : 2/1×0.1 = 0.2
Mass of magnesium oxide:
Mass = number of moles × molar mass
Mass = 0.075 mol × 40 g/mol
Mass = 3 g
950 J of energy is used to heat an unknown mass of copper from 20.0° C to 95.0° C. The specific heat of copper = 0.39 J/(g·°C).
What is the mass of the copper?
Answer:
32g
Explanation:
I just took the test and got it right
The mass of the copper is approximately 32.5 grams.
To find the mass of the copper, we can use the formula for heat:
Q = m * c * ΔT
where Q is the heat energy, m is the mass, c is the specific heat, and ΔT is the change in temperature.
In this case, we are given:
Q = 950 J (heat energy)
c = 0.39 J/(g·°C) (specific heat)
ΔT = 95.0°C - 20.0°C
= 75.0°C (change in temperature)
Substituting these values into the formula, we can solve for the mass (m):
950 J = m * 0.39 J/(g·°C) * 75.0°C
Dividing both sides of the equation by (0.39 J/(g·°C) * 75.0°C), we get:
m = 950 J / (0.39 J/(g·°C) * 75.0°C)
m ≈ 32.5 g
Therefore, the mass of the copper is approximately 32.5 grams.
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Which statement best describes what an ocean tide is?
A A change in water level that makes a high tide higher
B A change in water level at the shoreline that is being caused by the gravitational pull of the Moon
C A change in water level at the shoreline that is being caused by the gravitational pull of the Sun
D A change in water level that makes a low tide lower
Answer: B
Explanation: high tides and low tides are usually caused by the moon. The moons gravitational pull generates something called the tidal force. I’m not gonna go deep into this but yeah I think the answer is B
Answer:
:)
Explanation:
Can someone help?? This is really hard.
Answer:
See Explanation
Explanation:
Let us consider the first two reactions, the initial concentration of CO was held constant and the concentration of Hbn was doubled.
2.68 * 10^-3/1.34 * 10^-3 = 6.24 * 10^-4/3.12 * 10^-4
2^1 = 2^1
The rate of reaction is first order with respect to Hbn
Let us consider the third and fourth reactions. The concentration of Hbn is held constant and that of CO was tripled.
1.5 * 10^-3/5 * 10^-4 = 1.872 * 10^-3/6.24 * 10^-4
3^1 = 3^1
The reaction is also first order with respect to CO
b) The overall order of reaction is 1 + 1=2
c) The rate equation is;
Rate = k [CO] [Hbn]
d) 3.12 * 10^-4 = k [5 * 10^-4] [1.34 * 10^-3]
k = 3.12 * 10^-4 /[5 * 10^-4] [1.34 * 10^-3]
k = 3.12 * 10^-4/6.7 * 10^-7
k = 4.7 * 10^2 mmol-1 L s-1
e) The reaction occurs in one step because;
1) The rate law agrees with the experimental data.
2) The sum of the order of reaction of each specie in the rate law gives the overall order of reaction.
1.Explain why the reactivity of group 7 decreases as you move down the group. Try to use the sentence starters here: When group 7 elements react, their atoms….
As you move down the group, the outer shells get…
Therefore the force of attraction between the shells and the nucleus is….
This makes attracting an extra electron…
Answer:
Explanation:
When group 7 elements react , their atoms gains one electron into their highest occupied energy level ( outer shell) to form single negative - charged ion .
As you move down the group , the outer shells get increased i.e an additional electron shell is added thereby increasing the atomic radius of the atom. The electrons in the outer shell move further away from the nucleus as we go down the group .
Therefore the force of attraction between the shells and nucleus is decreased .
This makes attracting an extra electron difficult . And so ability of the atom to attract electron to fill the outermost shell reduces which means the reactiveness of the atom reduces.
Given the reaction: 4NH3 + 502 4NO + 6H2O
What is the total number of moles of NO produced when
1.0 mole of O2 is completely consumed?
Answer:
[tex]\frac{4}{5}[/tex] moles
Explanation:
The reaction equation is given as:
4NH₃ + 5O₂ → 4NO + 6H₂O
The number of moles of O₂ that completely reacted is given as 1 mole
To solve this problem, we are going to use a stoichiometric approach from the balanced reaction equation:
5 moles of O₂ will react completely to produce 4 moles of NO
1 mole of O₂ will therefore react to produce x mole of NO
5x = 4
x = [tex]\frac{4}{5}[/tex] moles of NO
Answer: 0.80 mole
Explanation:
Word equation for Silver being added to sulphuric acid
Answer:
See the answer below
Explanation:
When silver is added to dilute sulphuric acid, no reaction would occur. However, silver reacts with hot and concentrated sulphuric acid to produce silver sulphate, sulphur dioxide, and water.
The equation of the reaction is as below:
silver + sulphuric acid --> silver sulphate + water + sulphur dioxide
[tex]2Ag(s) + 2 H_2SO_4(aq) -->Ag_2SO_4 (s) + 2 H_2O (l) + SO_2 (aq)[/tex]
How to balance 4NaNO3 + 5PbO → 8Pb(NO3)2 + 7Na2O with coefficients?
The balanced equation
2NaNO₃ + PbO → Pb(NO₃)₂ + Na₂O
Further explanationGiven
Reaction
NaNO3 + PbO → Pb(NO3)2 + Na2O
Required
Balanced equation
Solution
1. Give coefficientaNaNO₃ + bPbO → Pb(NO₃)₂ + cNa₂O(Pb(NO₃)₂ ⇒coefficient 1 for the most complex compounds)
2. Make an equationN, left=a, right=2⇒a=2
Na, left = a, right=2c⇒a=2c⇒2=2c⇒c=1
Pb, left = b, right=1⇒b=1
The equation becomes :
2NaNO₃ + PbO → Pb(NO₃)₂ + Na₂O
14.
Consider the following balanced chemical equation:
P205
3 H2O → 2 H3PO4
Calculate the mass of hydrogen phosphate, H3PO, that will be produced from 105.9 g of P,Os.
Answer:
Mass = 72.52 g
Explanation:
Given data:
Mass of hydrogen phosphate produced = ?
Mass of P₂O₅ react = 105.9 g
Solution:
Chemical equation:
P₂O₅ + 3H₂O → 2H₃PO₄
Number of moles of P₂O₅:
Number of moles = mass/molar mass
Molar mass of P₂O₅ 283.9 g/mol
Number of moles = 105.9 g/ 283.9 g/mol
Number of moles = 0.37 mol
Now we will compare the moles of P₂O₅ with H₃PO₄ from balance chemical equation.
P₂O₅ : H₃PO₄
1 : 2
0.37 : 2/1×0.37= 0.74 mol
Mass of H₃PO₄ :
Mass = number of moles × molar mass
Mass = 0.74 mol × 98 g/mol
Mass = 72.52 g
A scuba diver begins to surface carrying a tank containing 4.0 L of a
gas at 730 mm Hg. What volume will the gas occupy at 760 mm Hg?
O A. 3.8 L
OB. 4.2 L
O C. 120 mm Hg
O D. 920 mm Hg
Answer:
3.8 L
Explanation:
From Boyle's law;
P1 V1 = P2 V2
P1 = initial pressure = 730 mm Hg
P2 = final pressure = 760 mm Hg
V1= Initial volume = 4.0 L
V2 = final volume = ?
V2 = P1 V1/P2
V2 = 730 × 4/760
V2 = 3.8 L
A neutral atom (atomic number > 1) has
(a) electron and proton
(b) neutron and electron
(c) neutron, electron and proton
(d) neutron and proton.
Liquid waste that exits the body is _____________ and solid waste is ___________.
A. Feces, Urine
B. Urine, Feces
C. Lymph, Feces
D. Blood, Lymph
Answer:
The answer is B. Urine, Feces
Explanation:
Answer:
b.urine ,feces
.................
How many chlorine atoms are on the products side of the reaction 2al 6hcl → 2alcl3 3h2? 2
Answer:
6
Explanation:
The given reaction is aluminium with hydrochloric acid
2Al + 6HCl → 2AlCl3 + 3H2
the product is aluminium chloride and hydrogen gas.
We can clearly, calculate that there are 2*3=6 chlorine atoms in product side of the reaction.
Answer:
C. 6
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Explanation:
Person is right.
A small, hard-shelled fossil that resembles a modern-day ocean organism was found
in the desert.
As
What can geologists conclude about this desert?
These shelled organisms migrated from the ocean to the desert.
Prehistoric man enjoyed eating shelled organisms in the desert.
A glacier once moved across the desert sands.
The desert was once covered by ocean water.
Answer:
The desert was one covered by ocean water.
Explanation:
PLEASE HELP THIS IS WORTH 13 POINTS
Answer:
The chemical reaction is a Double Displacement
Explanation:
Balance the reaction of KOH + AlCl3 = KCl + Al(OH)3
0.0721 moles of a compound have a mass of 31.008 grams. What is the molar mass?
(please show work and provide an explanation!)
Answer:
divide the moles by gram to get molar mass
use calculator and get yo ans
En un matraz, disponemos de 100 g de gas oxígeno que se encuentran a 1 at de presión y 273 K de temperatura. Calcular : a) el número de moles de gas oxígeno contenidos en el matraz ; b) el número de moléculas de oxígeno ; c) el número de átomos de oxígeno ; d) el volumen ocupado por el oxígeno. Masa atómica del oxígeno = 16.
Answer:
Explanation:
Dado que:
masa de oxígeno gaseoso = 100 g
presión = 1 atm
temperatura = 273 K
(a)
número de moles de oxígeno contenidos en el matraz = masa de oxígeno / masa molar de oxígeno
= 100 g / 16 gmol⁻¹
= 6.25 moles
(b) El número de moléculas de oxígeno es el siguiente:
Dado que 1 mol de oxígeno gaseoso contiene 6.023 * 10²³ moléculas de oxígeno.
Entonces, 6.25 moles contendrán:
= (6.25 × 6.023 * 10²³) moléculas de oxígeno.
≅ 3.764 × 10²³ moléculas de oxígeno.
(c) El número de átomos de oxígeno es:
= 2 × 3.764 × 10²³
= 7.528 × 10²³ átomos de oxígeno
(d) Usando la ecuación de gas ideal
PV = nRT
El volumen ocupado por el oxígeno = [tex]\dfrac{nRT}{P}[/tex]
Volumen ocupado por oxígeno = [tex]\dfrac{ 6.25 * 8.314 *273}{1}[/tex]
Volumen ocupado por oxígeno= 14185.76 m³
Price increases on goods in the economy signal producers to __________ production.
A.
stop
B.
increase
C.
decrease
D.
maintain
Answer:
C. decrease
Explanation:
Price increases on goods in the economy signal producers to decrease production.
Producers benefits more when the price of goods and services increases in the market. This makes them have more profit.
To maintain this profit level, they often decrease their production output to create a form of artificial scarcity within the market to sustain the price at which their goods trades.
If the producer increases the amount of goods they produce, this flux of goods can cause a decrease in price as the consumer is favored with a good bargaining power.Answer:
C
Explanation:
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