Answer:
H₂O + Na → NaOH + H₂
Explanation:
Firstly, a skeleton equation does not reflect the relative amount of reactants and products. A skeleton reaction only identifies the reactant and product by their chemical formula but it does not quantify them. A skeleton chemical equation is simply described as an unbalanced equation.
The question asked for the correct skeleton reaction of water and sodium to produce sodium hydroxide and hydrogen.
Let us represent them with their chemical formula
Water → H₂O
Sodium → Na
Sodium hydroxide → NaOH
Hydrogen → H₂
The skeleton reaction will be
H₂O + Na → NaOH + H₂
If 0.092J of heat causes a 0.267 degree C temperature change, what mass of water is present?
Answer:
0.082g
Explanation:
The following data were obtained from the question:
Heat (Q) = 0.092J
Change in temperature (ΔT) = 0.267°C
Specific heat capacity (C) of water = 4.184J/g°C
Mass (M) =..?
Thus, the mass of present can be obtained as follow:
Q = MCΔT
0.092 = M x 4.184 x 0.267
Divide both side by 4.184 x 0.267
M = 0.092 / (4.184 x 0.267)
M = 0.082g
Therefore, mass of water was present is 0.082.
Why do chemical reactions happen?
Answer:
They happen because each element reacting is trying to attain stability
Explanation:
E.g Mg +Cl>MgCl2
define the term acid
Answer:
An acid is simply a molecule or a chemical which gives hydrogen ions while mixed or reacted with water
What is the Ka of a 0.0675 M
solution of carbonic acid
(H2CO3) with a pH of 5.19?
Ka = [ ? ] x 10
Help ASAP
Answer:
The Ka is 6.183 * 10^-10
Explanation:
The first thing to do here is to write the dissolution equation of carbonic acid in water.
H2CO3 + H20 ———> H30+ + HCO3-
After writing this, the next thing is to write the expression for Ka
Mathematically that would be ;
Ka = [H30+][HCO3-]/[H2CO3]
Next thing is to set up an ICE table
ICE table stands for initial, change and equilibrium.
For clarity sake, please check attachment for the ICE table for this chemical reaction
Mathematically by definition;
pH = -log [H3O+]
From the question, we were made to know that the pH is 5.19
Hence;
5.19 = -log [H3O+]
-5.19 = log [H30+]
[H3O+] = 10^-(5.19)
[H3O+] = 6.46 * 10^-6 M
So how does this relate to the ICE table?
From the ICE table, we can see that the equilibrium concentration of the hydroxonium ion equals x.
This means that the equilibrium concentration of the hydroxonium ion [H3O+] , demoted as x = 6.46 * 10^-6 M
Now according to the Ka equation;
Kindly recall that;
Ka = [H30+][HCO3-]/[H2CO3]
Now, using their equilibrium concentrations;
Ka = (x)(x)/(0.0675-x)
Ka= x^2/(0.0675-x)
Kindly substitute 6.46 * 10^-6 for x
Ka = (6.46 * 10^-6)^2/(0.0675-(6.46 * 10^-6)
Ka = 6.183 * 10^-10
Answer:
The answer is actually 6.18x10^-10
Explanation:
Fill in th box 6.18 and -10
Which of these rocks is most likely to be damaged by acid rain?
Limestone
Granite
Gabbro
the answer is limestone because it is the weakest
Question 1 of 6
Which set of coefficients correctly balances the following chemical equation?
Fe +
Cl2 = FeCl3
(1 point)
DA. 2, 3,2
1
C. 1, 1, 1, (already balanced)
D. 4,6,4
E. 2, 1, 2
tea
B. 1, 2,
Answer:
Option A. 2, 3, 2
Explanation:
We'll begin by balancing the equation. This can be achieved by doing the following:
Fe + Cl2 —> FeCl3
There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cl2 and 2 in front of FeCl3 as shown below:
Fe + 3Cl2 —> 2FeCl3
There are 2 atoms of Fe on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Fe as shown below:
2Fe + 3Cl2 —> 2FeCl3
Now the equation is balanced.
The coefficients are : 2, 3, 2
1 When a chemical reaction occurs A. the substances involved do not mix together and maintain their original properties. B. the properties of the substances that are produced are identical to the properties of the original substances. C. the substances involved mix together but maintain their original properties. D. the proberties of the substances that are produced are different from the properties of the original substances.
Answer:
D
Explanation:
The proberties of the substances that are produced are different from the properties of the original substances.
Help me with these questions google won’t tell them for me!!
Describe air pollution from the burning of forests.
Answer:
Explanation: Wildfires emit carbon dioxide and other greenhouse gases that will continue to warm the planet well into the future. They damage forests that would otherwise remove CO2 from the air.
DISCUSSION QUESTIONS:
1) Distinguish how P-waves and S-waves travel differently with illustrations and
labels.
2) What type of seismic wave will reach a recording station 500 miles away from the epicenter first
Answer:
P-waves compression waves while S-waves are shear waves.
Explanation:
P- waves has the ability to travels through solid, liquid and gaseous medium while S-waves travels through only solid medium and restricted by liquid and gaseous medium. P-waves is a type of seismic wave that will reach first to the recording station as compared to S-waves because P-waves moves faster that S-waves that moves slower so that's why P-waves reach first on the recording station that is located 500 miles away.
What natural resources, if any, were discovered or developed over time in Dublin?
Answer:
Resources and power
Discoveries of silver, lead, zinc, and gypsum have been successfully developed, but the country's dependence on imports for its energy requirements is high. In the early 1980s offshore natural gas wells began production in the Celtic Sea south of County Cork.
Explanation:
The primary natural resources of the Republic of Ireland include natural gas, petroleum, peat, copper, lead, dolomite, barite, limestone, gypsum, silver and zinc. Key industries based on these and other natural resources include fishing, mining, and various forms of agriculture and fish farming.
why did mendeleyev leave spaces in the periodic table
Answer:
Mendeleev left spaces in his periodic table because he predicted there were elements that weren't discovered yet that would fit in these spaces.
Explanation:
Answer:
He left gaps in his periodic table to place elements not known at the time.
Ethane is a member of the hydrocarbon series with the general formula
A) CnH2n+2
B) CnH2n
C) CnH2n–n
D) CnH2n–6
Answer:
A) CnH2n+2
Explanation:
let me know the answer to this oneeee
1.2 moles of hydrogen
please see the attached picture
hope it helps
Good luck on your assignment
What type of energy transformation occurs in a campfire?
1.light energy to mechanical energy
2.thermal energy to light energy
3.mechanical energy to chemical energy
4.chemical energy to light and thermal energy
Explanation:
I believe it is number four
2. Do you think you would have to exercise longer to use the energy that can be released
from three grams of carbohydrate, fat or protein? Why?
If you were making S’mores [using a chocolate bar, gram-crackers, and marshmallows] at a campfire, would this process be considered a chemical reaction?
Answer:
The process of making S'more by adding chocolate bar, gram-crackers, and marshmallows in layers is not a chemical reaction
Explanation:
In a chemical reaction, the substances involved in the reaction are known as the reactants and the substances produced have different physical and chemical properties than those of the reactants and they are known as the products.
The bonds that hold the atoms of the reactants are broken down and rearranged, creating entirely new substances as products. Therefore, energy must be added and/or evolved in any chemical reaction and all reactant atoms should be involved in the reaction.
The change in energy can be sensed as heat change such as increase or decrease in the temperature of the products
Since S'more does not involve any of the above changes that occur in a chemical reaction when the chocolate bar, gram-crackers, and marshmallows are put together, it is not a chemical change or a chemical reaction.
The volume of an ideal gas is inversely proportional to the pressure
applied to the gas at a constant temperature. A gas has a volume of
239 liters at a pressure of 2.00 atmospheres (atm). What pressure is
applied to this gas if the volume is .500 liters?
Answer:
Final pressure is 0.956 atm
Explanation:
Based on Boyle's law, "The volume of an ideal gas is inversely proportional to the pressure when temperature is constant". The equation is:
P₁V₁ = P₂V₂
Where 1 represents initial state and 2 final state of the gas.
If a gas has 239L and 2.00 atm as initial state. If the final volume is 500L:
239Lₓ2.00atm = P₂500L
239Lₓ2.00atm / 500L = P₂
0.956atm = P₂
which statement describe a species adapting to changes in it’s environment?
Answer: Example: The water in a species envirmoent suddenly becomes more acid therefore, the species adapts it's body to become more resistent and tolerate to chemicals.
This might also give it an adavantage to the species who have not yet adapted to the change
Explanation: There are three type of adaptions. 1) Structural 2) Behavioral 3) Physiological
Help haha Hahahahaha
Answer:
284.395332
Explanation:
1 mole= 36.46094
so multiply 36.46094 times 7.8
and you get 284.395332
hope that helped ! Please mark brainliest I only need one more.
What characteristic of light determines what color it appears?
Answer:
Light is made up of wavelengths of light, and each wavelength is a particular colour. The colour we see is a result of which wavelengths are reflected back to our eyes. The visible spectrum showing the wavelengths of each of the component colours. The spectrum ranges from dark red at 700 nm to violet at 400 nm.The 'colour' of an object is the wavelengths of light that it reflects. This is determined by the arrangement of electrons in the atoms of that substance that will absorb and re-emit photons of particular energies according to complicated quantum laws.The reason that different waves of light appear to be different colors of light is because the color of a light wave depends on its wavelength. For example, the wavelength of blue light is about 450 nanometers, while the wavelength of red light is about 700 nanometers.
Explanation:
An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of
A) 2–
B) 2+
C) 3+
D) 3–
The answer is D. Why the answer is not A but D? Can you explain?
The net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.
HOW TO CALCULATE NET CHARGE:
The net charge of an ion can be calculated by subtracting the number of electrons from the number of protons in an atom. That is;net charge = no. of protons - no. of electrons
The number of protons is the number of positive charges while the number of electrons is the number of negative charges in an atom. Therefore, if an ion consists of 7 protons, 9 neutrons, and 10 electrons, the net charge is as follows:net charge: 7 - 10
net charge = -3
Therefore, the net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.Learn more: https://brainly.com/question/21430387?referrer=searchResults
acid rain water breaks down Rocks by_____ weathering
｡☆✼★ ━━━━━━━━━━━━━━ ☾
This would be 'chemical' weathering.
Acid rain would react with the minerals in the rocks, causing them to break down.
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Answer:
Chemical
Explanation:
Chemical weathering. The weathering of rocks by chemicals is called chemical weathering . Rainwater is naturally slightly acidic because carbon dioxide from the air dissolves in it. Minerals in rocks may react with the rainwater, causing the rock to be weathered.
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How many moles of KNO3 will be required to prepare 8.0L of 1.40 M KNO3?
Answer:
11.2 moles of KNO3 will be required to prepare 8.0 L of 1.40 M KNO3
Explanation:
To answer this question, we need an understanding of the units of the term called molarity.
1.40M KNO3 means that there are 1.4 moles per dm^3 or per liter of the solution.
Now, since there are 1.4 moles in 1 liter
x moles will be present in 8.0 liters
Thus, mathematically;
x * 1 = 8 * 1.4
x = 11.2 moles
how does water affect the growth of a plant?
Answer:
Water transports important nutrients throughout the plant.
Explanation:
Much like blood in an animal, water is necessary for a plants survival, as it transports important nutrients from the soil all through the plant's stems and leaves.
What is the molar ratio of CO2 to C2H2
Propane burns in oxygen to produce carbon
dioxide and water. What are the chemical
formulas of the reactants and products?
The formulas of the reactants are C3H8, O,
and CO2. The formula of the product is H20.
The formulas of the reactants are C3Hg and
O2. The formulas of the products are CO and
H20.
The formulas of the reactants are C3Hg and
02. The formulas of the products are CO2
and H20.
Answer:
Reactants are C3H8 and O2
Products is CO2 and H20
What is the sequence of energy transformations that occur in a nuclear reactor? nuclear energy Right arrow. Mechanical energy Right arrow. Thermal energy Right arrow. Electrical energy nuclear energy Right arrow. Thermal energy Right arrow. Mechanical energy Right arrow. Electrical energy thermal energy Right arrow. Nuclear energy Right arrow. Mechanical energy Right arrow. Electrical energy electrical energy Right arrow. Thermal energy Right arrow. Mechanical energy Right arrow. Nuclear energy
Answer:
NUCLEAR ENERGY -----> MECHANICAL ENERGY -------> THERMAL ENERGY --------> ELECTRICAL ENERGY
Explanation:
In nuclear reactor, various energy transformations occur in order to generate electricity. Nuclear reactor converts the energy released from nuclear fission and the heat generated is removed from the reactor by a cooling system where steam is generated. The steam then drives a turbine which powers a generator to produce electricity.
A nuclear reactor is hence an equipment where nuclear chain reactions occur and control can be obtained. The nuclear reactor uses mostly uranium-235 and Plutonium-239. When these radioactive substances absorbs neutrons, they undergo nuclear fission causing the nucleus to split into two or more smaller compounds with the release of kinetic energy a form of mechanical energy, gamma radiations and others.The kinetic energy is then harnessed in the equipment as heat (thermal energy) which is received by a cooling system and steam is generated. The steam can then power the generator from which electricity is obtained (electrical energy).
So therefore, in a nuclear reactor, the nuclear energy is transformed to mechanical energy and then thermal energy which powers the generation of the electrical energy.
Answer:
nuclear energy Right arrow. mechanical energy Right arrow. thermal energy Right arrow. electrical energy or (A)
Explanation:
Assign oxidation numbers to each atom in KBrO4
Answer:
K: +1
Br: +7
O: -2
Explanation:
O is always -2
K is in group one, so that is its charge
-8+1 is -7, so we flip the sign and that becomes Br
The reason why we flip it is to get a net balance of 0
A compound is formed by the reaction between magnesium and bromine. What is the chemical formula for this compound?
Answer:
Magnesium Bromide
Explanation:
MgBr₂