Answer/Explanation:
62.559%
mass of an element X 100%
mass of the compound
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
Pick out the metals which can react with magnesium sulphate solution. Justify the answer.
calcium, aluminium, mercury, sodium, platinum, copper
Answer: aluminium, mercury , platinum and copper.
Explanation:
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.
A general single displacement reaction can be represented as :
[tex]XY+Z\rightarrow XZ+Y[/tex]
Thus the metals which are more reactive than magnesium will react with magnesium sulphate solution.
The metals which are more reactive than magnesium are aluminium, mercury , platinum and copper.
Some fruits and vegetables are preserved by pickling them. Nandini got confused
with the various steps to be taken to preserve mangoes. Can you help her to
arrange them in the correct order?
1. Cut the mangoes into pieces.
2. Keep the pieces in the sun.
3. Add salt to the pieces.
4. Store it in a dry jar.
5. Wash and dry them
Answer:
ye
Explanation:
ye
How is the rock in the deep mantle similar to the rock in the parts of the mantle nearest the surface? How is it different?
Answer:
Similarity: Rocks within the mantle contain more magnesium and iron than the ones in the crust.
Difference: Rocks in the deep mantle are under intense heat and pressure. In this case, they are semi-solid rocks that flow slowly. On the other hand, the part of the mantle that is nearest to the surface consists of rigid rocks. It has a lower temperature than the rocks in the deep mantle.
Explanation:
Rocks within the mantle contain more magnesium and iron than the ones in the crust.
What is Rocks?
Rocks in the deep mantle are under intense heat and pressure. In this case, they are semi-solid rocks that flow slowly.
On the other hand, the part of the mantle that is nearest to the surface consists of rigid rocks. It has a lower temperature than the rocks in the deep mantle.
According to geologists, a rock is a naturally occurring material made up of crystalline crystals of various minerals that have fused together to form a solid mass.
Therefore, Rocks within the mantle contain more magnesium and iron than the ones in the crust.
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2KClO3 → 2KCl + 3O2
How many moles of KClO3would it take to make 6.0 moles of O2?
a) 1.5
b) 9.0
c) 2.0
d) 4.0
God is GOOD AND arr you sure that is written properly
HELP!!! DUE TONIGHT!!
10 PTS!!
the answers are given already but my teacher wants me to show work...pls help!!!
Answer:
K I will attempt
Explanation:
a)
[tex]O_2_{(g)}+ 2H_2_{(g)} => 2H_2O_{(l)}\\[/tex]
b)
1 : 2 : 2 (I don't know if this is what the question wants but it is what I would answer)
c)
Hydrogen because it requires 2 moles of H2 to react with 1 mole of O2
d)
24 moles of water. Look at stoichiometric coefficient. 2:2 means 24 moles you get 24 moles
e)
Oxygen. 2 < 5/2. Remember, 1 mole of O2 requires 2 moles of H2. But 5/2 is still greater than 2
f)
First, let's find out how many moles of water we can get. Since O2 is the limiting reactant, and O2:H2O ratio is 1:2, we will get 4 moles of H2O. Then, we can multiply 4 by Avogadro's number which is [tex]6.022*10^{23}[/tex] to get the number of molecules. We get: 2.41 * 10^24 molecules of water.
Answer:
I'ma just take the point thank you very much
Is it technically correct to call ionic compounds molecules?
Answer:
uh yeah I think so technically
Answer:
no
Explanation:
Which electron configuration could represent the electrons in a Sodium atom in an excited state?
Answer:
I think Ne electron configuration
Answer:
D 2-7-2
Explanation:
I got it wrong and then they showed me the right answer
Our Sun will eventually turn into a red giant and, finally, a white dwarf. Use the Hertzsprung-Russell
diagram to describe how the Sun's luminosity and temperature will change as it goes through these
stages.
Our Sun will eventually turn into a red giant in the cooler temperature and high luminosity and in the white dwarf phase has a hot temperature & dim luminosity.
What is Hertzsprung-Russell diagram?In astronomy, the Hertzsprung-Russell diagram, often known as the H-R diagram, is a graph that plots the absolute magnitudes (intrinsic brightness) of stars against their spectral classifications (temperatures).
From the given diagram it is clear that when sun turns into a red giant then the temperature decreases and luminosity increases as it becomes large in size. And when it finally become a white dwarf then temperature comparatively increases and luminosity gets dim due to smaller size.
Hence in the red giant phase sun has a cooler temperature and high luminosity and in the white dwarf phase has a hot temperature & dim luminosity.
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What is the pH of a 0.00001 M solution of HCI?
Answer:
0.00001= 1 x 10^-5. Since HCl is an acid, 1 x10^-5 is the H+ concentration. Write only the number of the exponent. Therefore, pH = 5.
A gas occupies 20 liters at a pressure of 40.0 mm hg. What is the volume when the pressure is increased to 80.0 mm hg?
Answer:
10 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
From the question we have
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{40 \times 20}{80} = \frac{800}{80} = 10 \\ [/tex]
We have the final answer as
10 Lhope this helps you
Newton's first law of motion explains how
affects an object's motion. According to
Newton's first law, an obiect at rest will stay at
Answer:
rest until and unless an external force is applied.
Help with chemistry please
Which chemical reaction involves the most oxygen atoms?
HELP I WILL GIVE BRAINLY FOR THE CORRECT ANSWER 1. Write the correct formula for the ionic compound formed between atoms of each of the following pairs of elements
.a. Sodium and sulfurb.
Aluminum and nitrogenc.
Barium and fluorined.
Sodium and phosphatee.
Calcium and hydroxidef.
Ammonium and carbonate
What is true about a chemical reaction
Answer: energy is transferred, but it can go to the products or the reactants.
Explanation: in a chemical reaction, the atoms and molecules that interact with each other are called reactants.
Miley partridge if you see this I am CJ and these hearts are for you ❤❤❤❤❤❤
Answer: not to be rude but who is Miley partridge? If she is a friend then u r a kind hearted person
Explanation:
Anna was looking at a map that showed where hurricanes had formed. She noticed that more hurricanes formed over tropical oceans than over colder ocean areas. Which of these best explains
why more hurricanes form over tropical oceans?
Water has fewer currents in tropical oceans than in colder oceans.
Air has less moisture over tropical oceans than over cold oceans.
Water has more waves in tropical oceans than in colder oceans.
Air has more moisture over tropical oceans than over
Answer: D
Explanation:
Calculate the volume, in liters, occupied by 1.80 moles of H2 gas at STP.
Answer:
40.32L
Explanation:
So we know that 22.4 Liters is one mole of a gass so we can set up an equation to test that
1mole 1.8mole
_____ = _____
22.4L x
and then cross multiply so you get 40.32L
Answer:
40.32L
Explanation:
Just did worksheet
1.
Many plants can reproduce asexually. How is this an advantage for the plant? Why can it sometimes be a disadvantage
for the plant? Use details to support your answer.
Answer:
Advantage and disadvantage of asexual reproduction in plant is described below in details.
Explanation:
An advantage of asexual reproduction is that the resulting plant will approach adulthood quicker. Since the new plant is emerging from a grown-up plant or plant components, it will also be stronger than a seed. Asexual reproduction can take a spot by natural or manufactured (assisted by humans) means.
The significant disadvantages of asexual reproduction are the Shortage of diversity. Following the seeds are genetically the same as the parent they are more sensitive to the same diseases and nutrient insufficiencies as the parent. All the negative deviations endure for generations.
Use the equation weight=mg to find the weight of a 45 kg child
Answer:
well the answer is 99.2lbs I know that
what is potential energy?
Answer:
energy held by by an object becuase of its position relative to other objects
Explanation:
Answer:
The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge , other factors.
Explanation:
I looked it up because i wanted to be sweet and help ((:
Which resource is renewable?
coal
oil
steel
wind
Answer: wind
Explanation:
ITEM BANK: Move to Bottom
Balance
Measured in Newtons
Measured in grams
Property of matter
Spring Scale
Weight
Both
Mass
Cugan 100
drag and drohte
Answer:
The scale reads the tension in the string. The tension in the string is 100 N. This is the force the string must exert up on either of the 100-N weights at either end of the string.
Nothing is moving, nothing is accelerating, so the net force on the spring is zero. Likewise, the net force on either of the 100-N weights is also zero. But that is another question. The spring scale does not measure the net force. The spring scale simply measures the tension, the magnitude of the force exerted by the string.
Explanation:
PLZZ HELPPP
According to the chart below, which planet has the smallest inner core?
Mars
Jupiter
Venus
Earth
Answer:
The earth
Since it is shown in the chart that, Earth is inner corner is the smallest.
What is the molecular formula of a compound that is 51.02 % carbon, 13.80 % hydrogen, and 35.18 %
oxygen? The molecular mass is 88.0 g/mol.
Answer:
Molecular formula = C₄H₁₂O₂
Explanation:
Given data:
Percentage of hydrogen = 13.80%
Percentage of carbon = 51.02%
Percentage of oxygen = 35.18%
Molecular formula = ?
Solution:
Number of gram atoms of H = 13.80 / 1.01 = 13.6
Number of gram atoms of O = 35.18 / 16 = 2.2
Number of gram atoms of C = 51.02 / 12 = 4.25
Atomic ratio:
C : H : O
4.25/2.2 : 13.6/2.2 : 2.2/2.2
2 : 6 : 1
C : H : O = 2 : 6 : 1
Empirical formula is C₂H₆O.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = C₂H₆O = 46 g/mol
n = 88 / 46
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (C₂H₆O)
Molecular formula = C₄H₁₂O₂
Which of the following elements has the strongest attraction for the electrons in a bond?
(A.) hydrogen
(B.) lithium
(C.) bromine
(D.) astatine
Answer:
A)
Explanation:
Entre todos esas materias el hidrógeno es el más fuerte
Explain how the magnetic field line data supports or refutes the claim that the launcher and spacecraft magnets were misaligned in the Tuesday launch.
Answer:
The magnetic field line data refutes the claim that the magnets were misaligned in the Tuesday launch.
Explanation: The data shows that there was no difference in the pattern of the field lines for all three launches. If the magnets in Tuesday's test had been misaligned, the force between the magnets in that test would be different than in the other test, showing both attraction and repulsion. During a misalignment at least one field line would connect opposite poles of the other magnets, but the magnetic field lines data we received did not show proof of misalignment. Therefore the magnets were correctly aligned on Tuesday.
Q2. Here is the word equation for a chemical reaction.
magnesium
+
zinc oxide
magnesium oxide
+
zinc
Write down everything that the word equation tells you about the reaction
(Total 4 marks)
Explanation:
magnesium + zinc oxide --> magnesium oxide + zinc
Mg + ZnO --> MgO + Zn
Reactants:
- Magnesium
- Zinc Oxide
Products:
- Magnesium oxide
- Zinc
Type of reaction: Displacement Reaction
The provided word equation depicts a chemical reaction between magnesium and zinc oxide that results in the creation of magnesium oxide and zinc.
Magnesium and zinc oxide are the reactants in the process. These are the substances that alter chemically. The process produces magnesium oxide and zinc. These are the new chemicals produced by the chemical process. This reaction undergoes a chemical transformation, as indicated by the term equation. Magnesium oxide and zinc are formed when magnesium interacts with zinc oxide.
The reaction's stoichiometry is not explicitly stated in the word equation. We cannot establish the exact quantities of the reactants and products involved without further information or factors. The term equation denotes that the reaction obeys the rule of mass conservation. The total mass of reactants must equal the total mass of products.
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which are exmaples of chemical change?
•baking cookies
• The statue of liberty's metal tarnishes from copper to green
• cold butter melts into liquid when heated
•salt is dissolved into freshwater
•Food scraps decompose into fertilizer in a compost pile
• frying changes the color and texture of an egg
•ocean water evaporates to water vapor on a hot day
•lighting a match
Answer:
cold butter melted when heated, lighting a match, baking cookies,
Explanation:
2) A sample of argon has a volume of 5.0 Land the pressure is 650 mm Hg If the final temperature is
30. C, the final volume is 5.7 L, and the final pressure is 800. mm Hg, what was the initial temperature
of the argon?
Answer:
[tex]T_1 = -57.15^{\circ}C[/tex]
Explanation:
Given
[tex]P_1 = 650mmHg[/tex] --- Initial Pressure
[tex]V_1 = 5.0L[/tex] --- Initial Volume
[tex]V_2 = 5.7L[/tex] --- Final Volume
[tex]P_2 = 800mmHg[/tex] --- Final Pressure
[tex]T_2 = 30C[/tex] ---- Final Temperature
Required
Determine the initial temperature (T1)
This question will be solved using combined gas law which states:
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
However, the final temperature must be converted to degree kelvin
[tex]T_2 = 30C[/tex] --- Add 273.15
[tex]T_2 = 30k + 273.15 k[/tex]
[tex]T_2 = 303.15k[/tex]
Make T1 the subject in [tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
[tex]T_1 = \frac{P_1V_1T_2}{P_2V_2}[/tex]
Substitute values for P1, V1, T2, P2 and V2
[tex]T_1 = \frac{650 * 5.0 * 303.15}{800 * 5.7}[/tex]
[tex]T_1 = \frac{985237.5}{4560}[/tex]
[tex]T_1 = 216.060855263[/tex]
Approximate
[tex]T_1 = 216k[/tex]
Convert to degree Celsius
[tex]T_1 = 216k[/tex] --- Subtract 273.15
[tex]T_1 = 216 - 273.15[/tex]
[tex]T_1 = -57.15^{\circ}C[/tex]
Hence, the initial temperature is -57.15C
What is an ion? What are the different properties of an ion? There is more than one answer choose all that apply
Answer:
An ion is an atom or molecule that has a different number of electrons than protons, so it has a charge.
Explanation:
Trust me please