Answer:
2Zn + PbCl4 → 2ZnCl2 + Pb
N.B: ZnCl2 is zinc chloride
Pb is lead
Explanation:
Zinc has a chemical symbol Zn while lead(IV) chloride has the chemical formula, PbCl4. Combining these two substances in a reaction will give rise to the following:
Zn + PbCl4 → ZnCl2 + Pb
However, this equation is not balanced. To balance the equation, we make sure that the atoms of each element on both sides of the reaction are equal. This is done as follows;
2Zn + PbCl4 → 2ZnCl2 + Pb
N.B: ZnCl2 is zinc chloride
Pb is lead
The photograph shows salt. Where does salt come from?
O A. The melting of metamorphic rock
B. The weathering of sediment
O C. The crystallization of magma
O D. The precipitation of sedimentary rock
Answer:
c. The crystallization of magma
Hope that helps! :)
Explanation:
If the reaction was reversed and we wanted to produce as much NaN3, in grams, as possible from 30.0 g of N2 and 20.0 g of Na, which reactant would be the limiting reactant? (4 points) How much NaN3 would actually be produced?
Answer:
N₂
Explanation:
Sodium is a larger molecule with a much higher molecular weight. However, 20g of N₂ would be a smaller amount of molecules than 20g of sodium due to how there are multiple nitrogen molecules.
2/3 * given mass of N₂ = mass of N₃
N₃ (Azide ion) given mass = 20g
Na = 20g
Masses of chemicals are equal
Na = 22.990g/mol
20g/22.990g/mol = 0.8699mol of Na
N₃ = 20g
N₃ = N g/mol x 3
N = 14.007 g/mol
14.007 x 3 = 42.021 g/mol
N₃ = 42.021g/mol
20g/42.021g/mol = 0.4759 mol of N₃
Notice how there are fewer moles of the Azide ion than the Sodium.
0.4759 moles of NaN₃ is produced
combine molecular weights:
42.021 + 22.990 = 65.011 g/mol
multiply by amount of moles of the limiting reactant:
0.4759 mol *65.011 = 30.942 g
Also, here is the balanced equation:
3N₂ + 2Na = 2NaN₃
The results are the same as the balanced equation.
Can somebody plz help answer these true or false questions correctly (only the ones you know that are right)
Thanks :3
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST..promise! :DDDD
Explanation:
1.False
2.False
3.True
4.True
5.False
There are two types of eclipses. Define each term:
solar eclipse -
lunar eclipse -
Answer:
solar- when the sun moon and earth are equally aligned meaning it has a shadow cast blocking sunlight
lunar- when the moon moves into the earth's shadow. it can only happen when the moon sun and earth are very close aligned and needs to have a full moon
Can someone explain this please?
What are sound waves?
Answer:
A wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air
Explanation:
Sound waves are often simplified to a description in terms of sinusoidal plane waves which are characterized
9. Which of these things is true about the Moon?
A
The Moon is always moving around Earth in a circle.
B
The Moon is always in the same position in Earth's sky.
С
The Moon is always moving in many changing patterns around Earth.
D
The Moon is always moving back and forth across Earth's sky.
The true statement about the Moon is: A. The Moon is always moving around Earth in a circle.
What is a Moon?A Moon can be defined as the natural satellite of planet Earth that shines due to the Sun's reflected light, as it revolves around the Earth from west to east in 29½ days.
The phases of the Moon.Generally, there are four (4) primary Moon phases and these are:
New MoonFirst QuarterFull MoonThird Quarter (Last Quarter)In conclusion, the true statement about the Moon is that it is always moving around Earth in a circle.
Read more on the Earth here: brainly.com/question/1286910
what would happen if a roof was made from wool?
A. it would not be transparent anymore.
B. it would not be waterproof anymore.
C. it would be soft and transparent.
D. it would be hard and water resistant .
Answer:
B
Explanation:
it will not be waterproof anymore
3. Most tornadoes happen in the
(6 Points)
Midwest
Northeast
Southwest
Mideast
how does meiosis differ from meiosis
During meiosis 1, the parent cell with double the normal amount of chromosomes, splits into two diploid cells (have enough chromosomes to survive). During meiosis 2, the two diploid cells each split into two haploid cells (have half the amount of chromosomes to survive). Meiosis ends with four haploid cells.
Which of the following reactions below could be properly categorized as a synthesis reaction?
Answer:
A synthesis reaction is a type of reaction in which multiple reactants combine to form a single product. Synthesis reactions release energy in the form of heat and light, so they are exothermic. An example of a synthesis reaction is the formation of water from hydrogen and oxygen.
Explain why sodium hydroxide is left in the solution after brine (a concentrated solution of sodium chloride ) is electrolysed.
Answer:
Sodium hydroxide us formed during the electrolysis of sodium chloride solution.
Explanation:
During electrolysis, hydrogen and chloride ions are removed from the solution, whereas sodium and hydroxide ions are left behind in solution.
Hope this helped
Identify which statement is true:
A. Isotopes of the same element have the same atomic number and different mass numbers.
B. Isotopes of the same element have the same number of neutrons and a different number of protons.
C. Isotopes of the same element have the same atomic number and mass number, but a different number of neutrons,
D. Isotopes of the same element have the same mass number and different atomic numbers.
Answer b
Explanation:
Answer: B. Isotopes of the same element have the same number of neutrons and a different number of protons.
Explanation: Founders Educere answer.
Good luck my fellow summer school students, I love you all.
Please rate, thanks, & vote brainliest, I want a rank up already.
salt plus water. two compounds mixed together to form a solution. The water is the solvent; the salt is the solution. students have been tasked with separating the two compound from solution.
Answer:
Evaporation
Explanation:
Students are to mix the solvent to dilute completely,and get and evaporation dish,candle(heat),tripod stand...pour the solution in the evaporation dish and place it on tripod stand above the candle wait for some time the water will change into gas and to get the water they have to cover the evaporating and direct it to a different container to get the water and salt
How many atoms are in 35g of water?
Explanation:
nH2O=35/18
xH2O=35/18x6.02x10 powered by 23
so, the answer is
[tex]11.70556 \times {10}^{23} [/tex]
im sry if im wrong
Producers are generally found at the beginning of a food chain. Which
statement best explains why this is true? *
1. Producers are usually smaller in size than consumers.
2. Producers do not rely on other organisms for food.
3. There are always more consumers than producers in food chains.
Explanation:
Second answer is the correct one.
Lance is studying how proteins are made. Which process should he study to understand how an mRNA strand is produced? mutation replication transcription translation
Answer:
Transcription
Explanation:
Transcription in genetics is a process in which a single strand of DNA is decoded and and mRNA is produced based on the sequence.
Mutation is the alteration of nuclear sequence therefore not true.
Replication is producing replicas of DNA, therefore not true.
Translation is the process in which proteins are made from transcribed mRNA strands therefore not true.
calculate the PH of a solution 0.030 M HCl
Answer:
pH = 1.522
Explanation:
HCl + H20 -> Cl^(-) + H30^(+)
0.03M ____ ____
____ 0.03M 0.03M
[H30^(+)] = 0.03M
pH = - log([H30^(+)])
pH = - log( 0.03)
pH = 2 - log3
pH = 2- 0.47
pH = 1.522
The pH of the hydrogen chloride, HCl solution having a concentration of 0.03 M is 1.52
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
How to determine the concentration of H⁺Dissociation equation
HCl(aq) —> H⁺(aq) + Cl¯(aq)
From the balanced equation above,
1 mole of HCl contains 1 mole of H⁺.
Therefore,
0.03 M HCl will also contain 0.03 M H⁺
How to determine the pH Hydrogen ion concentration [H⁺] = 0.03 MpH =?pH = –Log H⁺
pH = –Log 0.03
pH = 1.52
Learn more about pH:
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At 39 °C, a gas occupies 45.5 mL. If the temperature is cooled to 2 °C,
what will the new volume be? *
1. 51.6 mL
2. none of these
3. 40.1 mL
4. 3.90 x 105 mL
Name the following alkane molecule (picture)
A.) 2-methyl-3-broom-5-ethyloctane
B.) 3-bromo-5-ethyl-2-methyloctane
C.) 3-bromo-5-ethyl-2,7-dimethylheptane
Answer: B. 3-bromo-5-ethyl-2-methyloctane
Explanation:
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
What is IUPAC nomenclature?The IUPAC nomeclature shows the standard,, approved pattern for naming organic compounds. As a matter of fact it is intended to enable pratitioners to write the name of a compound from structure.
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
Learn more about IUPAC nomeclature: https://brainly.com/question/14356798
how many moles of aluminum are produced from 4.9 moles of lithium?
Answer:
2.95078 × 10^23
hope this helps you ☺️☺️
The pressure of a sample of gas is 3.6 atm at 33°C. What is the pressure of this sample at 14°C?
Zn + 2HCI → ZnCl2 + Hz
3. How many moles of hydrogen, H2, will be produced if 0.95 moles of zinc, Zn, reacts
with 6.2 moles of HCI? (Hint: Must determine limiting reactant.)
Answer:
0.95 moles
Explanation:
I believe that this is the equation we are looking at since this is an acid- metal reaction, thus the products would be a salt and hydrogen gas (H₂):
Zn +2HCl → ZnCl₂ +H₂
The limiting reactant is the reactant that we do not have enough of for the reaction to continue. From the balanced equation, the mole ratio of Zn to HCl is 1: 2. This means that for every 1 mole of Zn, 2 moles of HCl is needed.
Let's calculate the number of moles of HCl needed to react with 0.95 moles of Zn.
Number of moles of HCl required
= 0.95 ×2
= 1.9 moles
Since we have 6.2 moles of HCl, HCl is in excess and thus Zn is the limiting reactant. For 6.2 moles of HCl, 3.1 moles of Zn would be needed but we only have 0.95 moles.
For every 1 mole of Zn, 1 mole of H₂ is produced.
Thus, since 0.95 moles of Zn has reacted,
number of moles of H₂ produced= 0.95 moles
Need this less than 4 minutes!! In which step do we see the chromosomes condense and meet up to form homologous pair?
Metaphase II Metaphase I Anaphase II Prophase I Prophase II
Answer:
Prophase I
Sorry if wrong I was rushing !!
This question is about equilibrium. Describe how a reaction reaches equilibrium.
Answer:
A reaction is at equilibrium when the amounts of reactants or products no longer change. Chemical equilibrium is a dynamic process, meaning the rate of formation of products by the forward reaction is equal to the rate at which the products re-form reactants by the reverse reaction.
Equilibrium is said to be reached when the rate of forward reaction is equal to the rate of reverse reaction.
What is equilibrium?In a chemical reaction, equilibrium is said to be reached when the rate of forward reaction is equal to the rate of reverse reaction. When that occurs, the system would come to a state in which the concentration of each of the species involved does not change.
Thus, equilibrium is said to be reached when the rate of forward reaction is equal to the rate of reverse reaction.
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List three examples of a carbon reservoir.
Answer:
Oceans, Fossil fuels, atmosphere
3. Density is influenced by changes in
Answer:
Atoms or molecules
Explanation:
Because if molecules are heated or colded the can be liquid or solid
2. The development of microscopes allowed scientists to investigate living things in greater detail. Through many investigations, scientists found evidence that all living things are made of one or more basic units that divide to form new units. Scientists used their evidence to explain the relationship between these “building blocks of life” and the organisms to which they belong. What are these explanations called?
a) Cell theory
b) Germ theory
c) Law of mitosis
d) Law of biogenesis
Answer:
a) Cell theory
Explanation:
Cell theory states that cells are the basic unit of life
some one please help me
Answer:
C.4
Explanation:
If+a+substance+has+a+half+life+of+520+years,+and+you+start+off+with+1,000+g+of+it.+it+is+the+year+2021,+how+much+will+i+have+left+in+the+year+3061
Answer:
[tex]A=250g[/tex]
Explanation:
Hello there!
In this case, by considering the radioactive decay as a first-order kinetic model:
[tex]A=Ao*exp(-kt)[/tex]
We can firstly calculate the rate constant given the half life:
[tex]k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{520years}=1.33x10^{-3}years^{-1}[/tex]
Thus, we can plug in the elapsed time and the initial amount Ao to obtain:
[tex]A=1,000g*exp[-1.33x10^{-3}years^{-1} *(3061-2021)years]\\\\A=250g[/tex]
Best regards!
Unsaturated, saturated, or supersaturated?
Answer:
supersaturated
Explanation: