Which of the following are always the same for atoms of the same element?
Mass of an atom
Atomic number
Neutron number
Mass number
The atomic number remains the same for all atoms of the same element.
The atom is composed of;
ElectronsProtonsNeutronsThe electrons are found in the orbit while protons and neutrons are found in the nucleus of the atom.
The number of protons in an atom is its atomic number. It is the identity of an element. All atoms of the same element must have the same atomic number even though they may differ in mass number.
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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.
A compound is formed by the reaction between magnesium and bromine. What is the chemical formula for this compound?
Answer:
Magnesium Bromide
Explanation:
MgBr₂
Help me with these questions google won’t tell them for me!!
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
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Answer: 200
Explanation:
The answer is 200 kPa
Why do chemical reactions happen?
Answer:
They happen because each element reacting is trying to attain stability
Explanation:
E.g Mg +Cl>MgCl2
how many carbons atoms are in propane?
How many grams of iron can be produced from 3.65g of Iron (III) Sulfate? 3Mg + Fe2(SO4)3 --> 3MgSO4 + 2Fe
A. 1.02g Fe B. 5.41g Fe C. 0.548g Fe D. 7.56g Fe
Answer:
Option A. 1.02g of Fe.
Explanation:
Step 1:
The balanced equation for the reaction.
3Mg + Fe2(SO4)3 —> 3MgSO4 + 2Fe
Step 2:
Determination of the mass Fe2(SO4)3 that reacted and the mass of Fe produced from the balanced equation. This is illustrated below:
Molar Mass of of Fe2(SO4)3 = (2x56) + 3[32 + (16x4)] = 112 + 3[32 + 64] = 112 + 3[96] = 400g/mol
Mass of Fe2(SO4)3 from the balanced equation = 1 x 400 = 400g
Molar Mass of Fe = 56g/mol
Mass of Fe from the balanced equation = 2 x 56 = 112g
From the balanced equation above,
400g of Fe2(SO4)3 reacted to produce 112g Fe.
Step 3:
Determination of the mass of Fe produced by reacting 3.65g of Fe2(SO4)3.
This is illustrated below:
From the balanced equation above,
400g of Fe2(SO4)3 reacted to produce 112g Fe.
Therefore, 3.65g of Fe2(SO4)3 will react to produce = (3.65 x 112)/400 = 1.02g of Fe.
Therefore, 1.02g of Fe is produced from 3.65g of Fe2(SO4)3.
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.
which one of the ff is correct about Acids?
a,acids have bitter taste
b,acids have HP value of less than 7
c,acids have POH value of less than 7
d,all are correct
Answer:
b acid have ph less than 7
The reaction nC2H4 + (-C2H4-)n is
an
example of
1.
saponification
2.
esterification
3.
polymerization
4.
fermentation
Answer:
Polymerization
Explanation:
Polymerization is the process by which molecules of small organic compounds combine repeatedly, in a regular manner, to form a complex organic compound. These small organic repeated units are called monomers, while the complex product formed are referred to as polymer.
In this reaction,
nC₂H₄ + -(C₂H₄-)n is the combination of smaller units of C₂H₄(ethene) to form larger units of (C₂H₄)n (polyethene).
Polyethene is formed due to addition polymerization which is the process where ethene break their double bonds to form links, so that the empirical formula of both are the same. This occurs in a chain reaction and the process is known as polymerization.
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 name of CH3CH2OCH2CH3?
Answer:
It is an ether so the nomenclature rule for naming the above compound will be:Alkoxy alkane , generally Alkoxy represent the smaller alkyl group and as in the above question both the alkyl group are same so it's IUPAC Name will be: Ethoxy ethane or Diethylether both are correct
Explanation:
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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
When is a scientific theory formed?
Answer:
when enough information is given to support a hypothesis (more info below)
Explanation:
If enough evidence accumulates to support a hypothesis, it moves to the next step known as a theory in the scientific method and is accepted as a valid explanation of a phenomenon. Tanner also explained that scientific theory is the framework for observations and facts.
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Please help! Don't forget to add your answer in kJ
Answer:
The answer to your question is given below.
Explanation:
The equation for the reaction is given below:
2H2O —> 2H2 + O2... ΔH = –572KJ
A. The reaction is exothermic since the enthalphy change, ΔH has a negative sign.
B. Since the enthalphy change, ΔH has a negative sign for the reaction, It means heat has be released to the surroundings. Therfore, 86.4g will also release heat.
C. We'll begin by calculating the mass of H2O that reacted from the balanced equation.
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g.
From the balanced equation above:
When 36g of H2O reacted, –572KJ of heat were released.
Therefore, 86.4g of H2O will react to release = (86.4 × –572)/36 = –1372.8KJ of heat.
Therefore, –1372.8KJ of heat is released.
acid rain water breaks down Rocks by_____ weathering
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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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A 360. g iron rod is placed into 750.0 g of water at 22.5°C. The water temperature rises to 46.7°C. What was the initial temperature of the iron rod?
Answer: The initial temperature of the iron was [tex]515^0C[/tex]
Explanation:
[tex]heat_{absorbed}=heat_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex] .................(1)
where,
q = heat absorbed or released
[tex]m_1[/tex] = mass of iron = 360 g
[tex]m_2[/tex] = mass of water = 750 g
[tex]T_{final}[/tex] = final temperature = [tex]46.7^0C[/tex]
[tex]T_1[/tex] = temperature of iron = ?
[tex]T_2[/tex] = temperature of water = [tex]22.5^oC[/tex]
[tex]c_1[/tex] = specific heat of iron = [tex]0.450J/g^0C[/tex]
[tex]c_2[/tex] = specific heat of water= [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]-360\times 0.450\times (46.7-x)=[750\times 4.184\times (46.7-22.5)][/tex]
[tex]T_i=515^0C[/tex]
Therefore, the initial temperature of the iron was [tex]515^0C[/tex]
6.0 L of oxygen gas is at a temperature of 5K. If the temperature of the gas is lowered to 1K at constant pressure, what is the new volume of the gas?
Answer:
THE NEW VOLUME AT 1 K IS 1.2 L
Explanation:
Using Charles' law which states that the volume of a given gas is directly proportional to its temperature provided the pressure remains constant.
Mathematically written as;
V1/T1 = V2/T2 at constant pressure
V1 = Initial volume = 6L
T1 = initial temperature = 5K
T2 = Final temperature = 1K
V2 = final volume = unknown
Re-arranging the equation by making V2 the subject of the equation, we obtain;
V2 = V1 T2 / T1
V2 = 6 * 1 / 5
V2 = 1.2 L
The new volume of the gas sample at 1 K is 1,2 L
Answer:1.2 L
Explanation: according to Charles law, the volume of a fixed mass of gas is directly proportional to it's temperature.
Volume is the size of the space that a gas occupies and it can be measured in liters, cubic meters, cubic decimeters etc.
The solution to this question is in the attached photo
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.
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.
The reaction below demonstrates which characteristic of a base? Upper C U upper S upper O subscript 4 (a q) plus 2 upper N a upper O upper H (a q) right arrow upper C u (upper O upper H) subscript 2 (s) plus upper N a subscript 2 upper S upper O subscript 4 (a q).
Answer:
The ability of a base to react with a soluble metal salt
Explanation:
The equation is given as;
CuSO4(aq) + NaOH → Cu(OH)2(s) + Na2SO4(aq)
A strong base (NaOH) can easily react with a soluble metal salt (CuSO4) and displace it.
The reaction between CuSO4 and NaOH is a double displacement reaction.
Answer:
The ability of a base to react with a soluble metal salt
Explanation:
A one-ounce bag of Hot Cheetos has 90 calories from fat and 150 total calories. A party size bag of hot Cheetos is 18.5 ounces. How many calories of fat have you consumed if you eat half a bag of party-size chips?
Answer:
832.5 calories
Explanation:
One ounce bag of Hot Cheetos contains 90 calories from fat and 150 total calories. Also a party size bag of hot Cheetos weigh 18.5 ounces.
Therefore the weight of half of a bag of party-size chips = Size of a party size bag of hot Cheetos / 2 = 18.5 ounces / 2 = 9.25 ounces.
Since one ounce bag of Hot Cheetos contains 90 calories from fat, the amount of fat contained in half a bag of party-size chips (9.25 ounces) is given as:
Calories of fat in half a bag of party-size = 90 calories per ounce × 9.25 ounces = 832.5 calories
Answer:
832.5 calories
Explanation:
What is the upward force on objects in a fluid
Answer:It is upthrust...
Explanation:I don't say u must have to mark my ans as brainliest but if it has really helped u plz don't forget to thank me my friend....
Student Name:.....
Q1.
The drawing below shows Rebekah pulling a turnip out of the ground.
B
(a)
Which arrow, A, B, C or D, shows the direction of force of Rebekah's hand on the
turnip?
1
1 mark
Answer:
ummm I really want to help with this problem but I think that you forgot the photo of Rebekah Pullin the turnip
pls say the 5 methods of preventing rusting of iron
Explanation:
Corrosion of iron is called as rusting. Rusting is oxidation of iron in the presence of oxygen and water and leads to formation of hydrated ferric oxide.
Methods to prevent rusting are :
1. Application of paint: It prevents the direct exposure of metal to atmosphere.
2. Application of oils or grease: It creates a barrier between the metal and atmosphere.
3. Galvanization : It is coating of iron with more active metal zinc so that zinc gets oxidized and protects iron.
4. Cathodic protection : It involves connecting iron to a more active metal which loses electrons on behalf of iron and thus protects iron by rendering it as cathode.
5. Coating with wax tapes: It prevents the direct exposure of metal to atmosphere.
What is the value of x in the equation below?
Answer: 7
Explanation: i don't know how the HECK. -3-(-8)-(-2)=7 but I searched it up soooooo also I got it right
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.
Name the elements present in a) zinc sulphide b) sodium oxide
Answer:
a) zinc, sulphur, oxygen
b) sodium, oxygen