Answer:
B. Ca(NO2)2
Explanation:
Ions (charged atoms) combine with one another to form stable ionic compounds. In this case, calicium ion (Ca2+) is said to react with NO2, which has a charge of -1 i.e. +1-1(2) = 1-2 = -1.
This means that calcium has a charge of +2 while nitrite ion has charge of -1, hence, when they combine, they exchange their charges, which become their subscript as follows:
Ca2+ + NO2- → Ca(NO2)2
Ca(NO2)2 is a stable ionic compound called calcium nitrite. Notice that it takes two atoms of NO2- to react with one atom of Ca2+.
Which statement describes the components of a mixture?
1.
Each component gains new properties.
2.
Each component loses its original properties.
3.
The proportions of components can vary.
4.
The proportions of components cannot vary.
Answer: 3
Answer: The proportions of components can vary.
Explanation:
A mixture is a combination that has to do with two or more substances. Some characteristics or properties of mixtures are that the substances that are added together retain their properties.
Also, the proportion of the components can vary and the components can be separated.
Therefore, the answer to the question will be option 3 "The proportions of components can vary".
explain why iron can displace copper from copper II nitrate solution, but copper cannot displace iron from iron III nitrate solution
Answer:
Iron metal is more reactive than copper.
Explanation:
Iron metal is more reactive than copper. ... Cu is less reactive than iron, therefore, cannot replace iron from iron sulphate (FeSO4). we have already seen that iron is more reactive than copper. So that means that in this reaction, copper is less reactive than iron. That means copper cannot displace iron. It cannot kick out iron from a sulfate.
Convert 12.0 g of FeO into moles.
Answer:
of FeO into moles.ififdjdjjfjdjfjfjfjfjfjfjfjfjfjfjf
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.167moles are there in 12.0 g of FeO into moles.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
Mathematically,
number of moles of FeO =given mass of FeO ÷ molar mass of FeO
Molar mass of FeO =71.8444 g/mol
mass of FeO = 12.0 g
Substituting all the given values in the above equation, we get
number of moles of FeO = 12.0 ÷71.84
number of moles of FeO =0.167moles
Therefore, 0.167moles are there in 12.0 g of FeO into moles.
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An atom of sodium can transfer its one valence electron to an atom of...
O magnesium to complete the octet rule
O fluorine to complete the octet rule
O nitrogen to complete the octet rule
O calcium to complete the octet rule
Answer: Either give off or gain electrons to make a total of 8
Made up of the protons and neutrons, this part or the atom contains nearly all the mass of the atom
Answer:
The nucleus
Explanation:
What is the Name of the Covalent Compound, Se3P4?
Answer:
For example, the compound FeSO4 is called iron(II) sulfate, because it contains Fe2+.
Explanation:
please mark me as brainliest thank you
7. A mix of two gases is in a balloon at room temperature. One gas becomes a liquid when placed in a household freezer, while the second one stays as a gas. How would you expect the volume
change when the balloon is placed in the freezer?
A. It shrinks gradually
B. It shrinks gradually, then suddenly gets a lot bigger
C. It shrinks gradually, then suddenly gets a lot smaller
D. It grows gradually
E. It grows rapidly
Please help :(((
Answer:
it shrinks gradually, then suddenly gets a lot smaller.
Explanation:
During the initial cooling the balloon begins to shrink. At the point where the 2nd gas turns to liquid the volume reduces drastically because liquids take up much less volume than their gas counterparts.
Answer:
do you go to hphs?
Explanation:
cuz i need this for chemistry:/
A substance is found to have a density of 2.4 g/ml and weighs about 100g. What is its volume?
Answer:
41.67 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]density = \frac{100}{2.4} \\ = 41.66666...[/tex]
We have the final answer as
41.67 mLHope this helps you
Explain why liquid freshwater is considered a limited resource.
Answer:
Freshwater is such a limited resource because there is such a little amount of freshwater found on Earth. About 77% of fresh water on Earth is frozen in glaciers and polar ice caps. Because of this, there is very little fresh water available for humans to use.
Explanation: Hope this helps.
Freshwater is a scarce resource, making up just around 3% of the total amount of water on Earth. Although freshwater is regarded as a renewable resource, certain areas utilize more freshwater than can be replaced by natural processes.
There is a very small amount of fresh water on Earth, making it a scarce resource. The polar ice caps and glaciers contain around 77% of the fresh water on Earth. This results in a relatively limited supply of fresh water for human use.
Since freshwater only accounts for around 3% of the total amount of water on Earth, it is a limited resource.
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need answer to this question asap. it is worth 10 points
the molar ratio of carbon to hydrogen of a volatile liquid compound is 1.2:0.12 of the liquid. on evaporation at s.t.p gave 32cm3 of vapour. what is the molecular formula of the liquid
The molecular formula of the liquid : C₆H₁₂
Further explanationGiven
molar ratio C H = 1.2 : 0.12
0.12 g at STP gave 32 cm³(0.032 L)
Required
The molecular formula
Solution
At STP, 1 mol = 22.4 L, so for 0.032 L :
mol = 0.032 : 22.4
mol = 0.00143
Molar mass (M) of liquid :
M = mass : mol
M = 0.12 g : 0.00143 mol
M = 83.92≈84 g/mol
C : H = 1 : 2
(CH₂)n=84
(12+2.1)n=84
(14)n=84
n=6
(CH₂)₆=C₆H₁₂
Anita did not make the track team this year, and she feels really disappointed and upset. What question would most likely redirect her thinking and provide a solution?
Answer:
Anita did not make the track team this year, and she feels really disappointed and upset. What question would most likely redirect her thinking and provide a solution?
Why did this terrible thing happen to me?
What other sports can I try this spring?
Why does everything I attempt go wrong?
Why did Karen get on the team but I didn't?
Answer - What other sports can I try this spring?
Explanation:
Failures and successes are part of our daily lives as humans. It can be very challenging for one to accept his or her failures and bring oneself above it.
when failure occur, the best way to reverse the negative impacts it brings is to move forward and decide on what next to do.
The actions that must be taken in the processes should be quite productive enough to bring back the results one desired.
When the effects of failures prove irreversible, one would then give the mind a diversion and help his or herself think their way though the failure that was encountered.
According to this Bohr model, in what period would this element be found?
Answer:
yes
Explanation:
yes
Is heat a form of kinetic energy or potential energy?
why handpicking is necessary after winnowing?
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This answers may help you
What is the result of the following calculation? Record to the correct number of significant figures. 7.94 g + 0.0132 g = ?
Select one:
a) 7.95 g
b) 7.9 g
c) 7.953 g
d) 7.9532 g
To solve such we need to know the concept behind significant figures. Addition, subtraction, multiplication and division follow the rules of significant figures. Therefore, the correct option is option A that is 7.95 g.
What is significant figures?
Significant figures of a number in positional notation are digits in the number that are reliable and necessary to indicate the quantity of something.
Rules for counting the significant figures are :
Zeroes before non zero digits are not significant
Zeros between non zero digits are significant.
Zeroes after non zero digits are not significant.
When we add two decimal numbers then, the final answer would be according to the number which have least significant number.
7.94 g + 0.0132 g = 7.95g
Since among 7.94 and 0.0132, 7.94 has the least significant numbers that is 3. So, answer should have 3 significant figures, answer will be 7.95.
Therefore, the correct option is option A that is 7.95 g.
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When we add friction into the skate park what happens to the skater? Skate park questions
Answer:
If you put friction in to skating rink then obvioulsy the skaters wont be able to glide and skate.
Explanation:
friction is power that disturbes the moving power. places like skating rink and slides try to have the least amount of friction.
What is the source of the ions involved in a redox reaction that occurs in an electrochemical cell?
Answer:
D. Electrodes
Explanation:
A redox reaction is defined as the reaction in which both oxidation and reduction reactions take place and electrons are transferred from oxidized substance to the substance that is being reduced.
An electrochemical cell is consist of electrodes (anode and cathode), electrolyte solution, salt bridge, and conducing wire. An electrochemical cell undergoes redox reaction that produces an electric current due to the movement of ions through electrodes. Electrodes are the source of ions, as anode electrode undergoes oxidation reaction and releases electrons or ions and cathode, gains electrons through reduction reaction.
Hence, the correct answer is "D. Electrodes".
Use the periodic table to identify the element represented by each of the following electron configurations.
Answer:
[He]2s^2: Be
[Ne]3s^23p^5: Cl (thats an L, not an i)
[Xe]6s^1: Cs
[Ar]4s^23d^9: Cu
SO IN ORDER IF YOU DONT WANNA READ ALL THAT
Be
CL
Cs
Cu
Explanation: Edge :)
Answer:1 Be 2 CL 3 Cs 4 Cu
Explanation:
H.C.F of 64 and 96 is
Answer: 32
Explanation: but you can find them on goggle
*HELP ASAP PLEASE !!*
What effect does the value for 20°C in trial 3 have on the data's measures of
central tendency?
A. The median will be lower than the mean and mode.
B. The mean will be lower than the median and mode.
C. The median will be higher than the mean and mode.
O
D. The mean will be higher than the median and mode.
Answer:
D
Explanation:
I look the quiz
Answer:
Its The mean will be higher than the median and mode.
Explanation:
I took the quiz, be careful because some times the answers are in other order.
Is BaOH2 soluble or insoluble in water?
Answer:
Explanation:
Tough question.
The answer is very dependent on the temperature of the water. At 0o C, less than 5 grams is soluble in water.
The curve increases as the temperature increases. At 80oC about 35 grams is soluble in water 100 mL of water. So Ba(OH)2 is very soluble at higher temperatures.
Maybe the question can be resolved just a little better at room temperature. The solubility is still less than 5 grams / 100 mL. That makes it slightly soluble or more soluble than other things.
So to answer the question, you need to specify the temperature. I would say it is, but be prepared to defend your answer.
The only way an object's speed or direction of motion can be changed is if a(n) _______ force acts on it.
A.
frictional
B.
unbalanced
C.
balanced
D.
electrical
Answer:
unbalanced
Explanation:
got in right on study islands
What is rate of reaction? Discuss in brief slow and fast reactions.
4. There is water inside your water bottle. Identify the solid.
Answer: the water bottle
Explanation:
yuh
One of the basic states of matter, described as having a distinct shape, size, and organized structure, is solid. The constituent particles of solids have fixed positions and oscillate around their mean positions. Solids also have distinct borders. Here the solid is a water bottle.
The atoms and molecules in a solid are so tightly bound together that they vibrate in situ rather than moving. Liquids have a fixed volume but can flow to change their shape. Atoms and molecules are only weakly bound together in liquids.
In the water bottle, a solid is a water bottle and water is a liquid. Solids' molecules continue to be tightly packed. Solids' molecules don't move about freely in all directions; instead, they stay stationary.
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Which of the samples contains the most atoms? Use evidence from the table to explain your answer.
Answer: Sodium/Na
Explanation: Molar mass is basically a measure of how heavy 6.02 x 10^23 atoms of a substance is, measured in grams.
So, if Sodium has the lowest molar mass then that means it’s molecules are very light. I’ll give a comparison: if you have 10 kilograms of bricks and 10 kilograms of feathers, will you have more feathers or bricks? Feathers, of course.
Mathematically it looks like this
50g/22.99g/mol = 2.17 mol
2.17 mol • 6.02 x 10^23 = 1.31 x 10^24 atoms
50g/58.93g/mol = 0.85 mol
You can see that as molar mass increases that the number of moles, and consequently, atoms, decreases.
Hope this helped
Stars making a circular motion across the sky is evidence of
Answer:
because they are actually moving, or because they reflect our motion through space.
Explanation:
Stars making a circular motion across the sky is evidence of the earth's rotation.
This is because when the earth rotates it appears to us like the stars are moving.
what are the uses of glycerin?
Explanation:
This medication is used as a moisturizer to treat or prevent dry, rough, scaly, itchy skin and minor skin irritations (e.g., diaper rash, skin burns from radiation therapy). Emollients are substances that soften and moisturize the skin and decrease itching and flaking.
Use what you have learned about the types of energy that travel from the Sun to Earth to match each term with its description.
Infrared Radiation
Ultraviolet Radiation
Radiation
Electromagnetic Waves
Visible Light
How Sun’s energy travels to Earth
Causes skin cancer and sunburn
Made of colors that the eye can see
Takes the form of heat
Transfer of energy from Sun
The type of energy is given as under :
How Sun’s energy travels to Earth - Electromagnetic WavesCauses skin cancer and sunburn - Ultraviolet RadiationMade of colors that the eye can see - Visible LightTakes the form of heat - Infrared RadiationTransfer of energy from Sun - Radiation.How is the tranfer of energy form sun to earth ?The sun transfers energy to the earth in the form of electromagnetic waves and the warm up the earth's upper air.
Some of the radiation that enters the earth get absorbed by the land surface. The sun is ths responcible for the energy distribution.
The visible light is part of wavelength that carries colors the human eyes can see. The infrared is the range that transfers the heat from the sun.
Find out more information about the Earth.
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A chemical reaction is shown below. Fe +H,0 – Fe 0,+H What are the products in the equation? A FeO, only B Fe only C Fe and H2O D Fe 0, and H
1 mole = 6.02 x 10^23 molecules. 1 mole= 22.4 L How many liters does 5.0 x 10^24 molecules occupy? .37 L 1.3 x10^49 L 190L or 6.7 x 10^49
Answer:
185.92 L
Explanation:
Given data:
1 mole = 6.022× 10²³ molecules
1 mole = 22.4 L
Volume occupy by 5.0× 10²⁴ molecules
Solution:
1 mole = 6.022× 10²³ molecules
5.0× 10²⁴ molecules × 1 mole / 6.022× 10²³ molecules
0.83× 10¹ mol
8.3 moles
1 mole occupy 22.4 L
8.3 mol × 22.4 L / 1 mol
185.92 L