Drinking water should have sufficiently low levels of dissolved salts to prevent disease.
What are the benefits of dissolved salts?Water contains dissolved salts which provide taste to water for drinking purposes. Also these salts are essential for growth and development of plants. These dissolved salts provide the essential minerals which are required for growth of body.
A dissolved salt disappears within a solution, so you can't see what it looks like. For example, when table salt dissolves in water, the Na+ and Cl- ions that form it dissociate and the ions float freely in water. You can no longer see the individual salt grains.
The two largest dissolved components of typical seawater are chlorine (56% of total) and sodium (31% of total), with the total of all lumped under the designation of “salts.”
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Many communities rely on solar energy for daily life uses.
Suppose the Moon was twice its size and cast a bigger shadow on Earth
during a solar eclipse, causing the light from the Sun to be blocked for
days. How would this affect the communities who rely on solar energy?
Answer:
This would affect the communities that use solar energy greatly, in a negative way.
Explanation:
If the moon were twice its size, and cast a larger shadow on Earth, the shadow would black out the earth to an almost night time, during the day. We would have a 24+ hour night, and communities relying on nothing but solar energy would be out of power until the sun was out again.
HELP ME PLEASE!
What information in a balanced chemical equation shows how many moles of a reactant are involved in the reaction?
A. The superscripts in a formula tell the number of moles of the molecule.
B. The oxidation states of atoms in a molecule tell the number of moles.
C. The coefficient in front of the molecule tells its relative number of moles.
D. The subscript in a formula tells the number of moles of that molecule.
The information in a balanced chemical equation shows how many moles of a reactant are involved in the reaction is,
The coefficient in front of the molecule tells its relative number of moles.So, option C is correct one.
What is chemical equation?The symbolic representation of chemical reaction is called chemical equation.There are three parts of in chemical equation,first reactant from where reaction is started, second product the final result and arrows between reactant and product which shows conversion.The reactant part given in left hand side and product part is given in right hand side in chemical equation.What is balanced chemical equation?The chemical equation in which number of each type of atom is equal in both side of the arrow is called balanced chemical equation.
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Which organelle acts like a screen door, separating its contents from the outside world?
capsule
mitochondria
plasma membrane
endoplasmic reticulum
Answer:
Plasma Membrane
Explanation:
Its the outer wall of a cell
Answer:
The answer is plasma membrane took the k12 test
Explanation:
The term ____________ refers to anything that occupies space and has mass.
Answer:
The term matter refers to anything that occupies space and has mass.
Explanation:
Answer:matter
Explanation:
Various methods of aquaculture can be used to grow species of marine fish. Consider the figure below, which shows one way that an aquaculture system can be
designed to allow water to flow freely through the net. Explain whether this represents an open or closed system and one benefit of using this type of system.
2015. SeaChoice org
Answer:
This is an open system, and one benefit is that it does not require as much filtration and maintenance.
Explanation:
Where can electrons be found?
b) What type of bond is formed between the atoms of this type of compound?
Answer: Covalent bond involves a pair of electrons being shared between atoms.
Explanation:
In what type of hybrid car do both the gasoline and electric motors run the car?
series
parallel
Explanation:
Series Hybrid:
Under this type of hybrid car, the Series Hybrid also employs both the petrol internal combustion engine as well as the electric motor. However, the internal combustion engine does not propel the car, instead it generates electricity to recharge the battery pack.
Answer:
Parallel
Explanation:
the products of the acid catalyzed hydrolysis of a fat are
The acid catalysed hydrolysis of fats yields fatty acids and glycerol which are the constituents of the fatty acid.
Fats are composed of triglycerides. Trigycerides are formed from fatty acids and propane - 1,2,3 - triol. Triglycerides are essential components of the human body.
Hydrolysis involves the breaking up of a substance into its constituents owing to the addition of water, acid or base. The acid catalysed hydrolysis of fats yields fatty acids and glycerol which are the constituents of the fatty acid.
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Explain what a valence electron is. Using the atomic structure above (#4) give the number of valence electrons.
Answer:
valence electrons are the electrons in the outermost shell and there are 6 valence electrons in sulfur
Balancing Chemical Equation
H2+N2=NH3
Answer:
H2 + 3N2 ⇒ 2NH3
Explanation:
Remember when balancing chemical equations you are trying to make sure that each side of the equation has a equal number of atoms, and when one sides number of atoms is odd you need to multiply to get a even number.
H2 + N2 = NH3
N = 1 × 2 = 2
H = 3 × 2 = 6
N = 2 × 1 = 2
H = 3 × 2 = 6
H2 + 3N2 ⇒ 2NH3
Hope this helps.
5. When moving down a group on the periodic table,
which two atomic properties follow the same trend?
A. atomic radius and ionization energy
B. ionic radius and atomic radius
C. ionization energy and ionic radius
D. ionic radius and electronegativity
Ollie has a mass of 45 kilograms. What is his weight in newtons?
Answer:
646.8
Weight in Newtons can be found by multiplying the mass times the acceleration of gravity.
The mass of the man is 66 kilograms on Earth.
Earth has an acceleration of gravity that is 9.8 meters per square second.
Substitute the values into the formula.
Multiply.
1 kg * m/s² is equal to 1 Newton, therefore our answer of 646.8 kg *m/s² is also equal to 646.8 Newtons, or N.
The man's weight in Newtons in 646.8 Newtons
............................................................
1. The force that pulls the atmosphere toward Earth
Answer:
Gravity :)
Explanation:
Calculate the molar concentration of the acid if "50.6 mL" of hydrochloric acid was required to neutralize 45.0 mL of 0.345 M "calcium hydroxide".
The molar concentration of the acid, HCl required for the reaction is 0.614 M
We'll begin by writing the balanced equation for the reaction. This is given below:
2HCl + Ca(OH)₂ —> CaCl₂ + 2H₂O
The mole ratio of the acid, HCl (nA) = 2
The mole ratio of the base, Ca(OH)₂ (nB) = 1
From the question given above, the following data were obtained:Volume of acid, HCl (Va) = 50.6 mL
Volume of base, Ca(OH)₂ (Vb) = 45 mL
Molarity of base, Ca(OH)₂ (Mb) = 0.345 M
Molarity of acid, HCl (Ma) =?MaVa / MbVb = nA/nB
(Ma × 50.6) / (0.345 × 45) = 2
(Ma × 50.6) / 15.525 = 2
Cross multiply
Ma × 50.6 = 15.525 × 2
Ma × 50.6 = 31.05
Divide both side by 50.6
Ma = 31.05 / 50.6
Ma = 0.614 MTherefore, the molar concentration of the acid, HCl is 0.614 M
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The molar concentration of the acid is 0.614 mol/L
The balanced chemical reaction for the reaction is
Ca(OH)₂ + 2HCl → CaCl₂ + H₂O
Using CV/C'V' = n/n' where C = molar concentration of hydrochloric acid, V = volume of hydrochloric acid = 50.6 mL = 0.0506 L, n = number of moles of hydrochloric acid = 2, C' = molar concentration of calcium hydroxide = 0.345 M = 0.345 mol/L, V' = volume of calcium hydroxide = 45.0 mL = 0.045 L, n' = number of moles of calcium hydroxide = 1.
Making C subject of the formula, we have
C = nC'V'/n'V
Substituting the values of the variables into the equation, we have
C = nC'V'/n'V
C = 2 × 0.345 mol/L × 0.045 L/(1 × 0.0506 L)
C = 2 × 0.345 mol/L × 0.045 L/0.0506 L
C = 0.03105 mol/0.0506 L
C = 0.614 mol/L
So, the molar concentration of the acid is 0.614 mol/L
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WILL GET BRAINLIEST!!!! Please Help
describe the sharing of electrons in polar covalent bonds and nonpolar covalent bonds
If you were to compare the function of a cell to the function of a city , which of the following organelles would be the city’s power plant
Answer:
Mitochondria
Explanation:
The mitochondria is the powerhouse of the cell
What is used to measure the amount of matter in a solid, liquid, or gas?
A. Celsius and Fahrenheit
B. Grams and kilograms
C. Kilometers and miles
D. Miles and meters
Answer:
B
Explanation:
Grams and kilograms :)
A decomposition chemical reaction can be compared to
Select one:
a.
eight couples doing a square dance.
b.
a dancing couple breaking up.
c.
two dancing couples switching partners.
d.
two single people joining for dance.
Answer:
I think is letter D
Explanation:
sana makatulong
Answer:
b. a dancing couple breaking up
Explanation:
Decomposition Reaction :
It is a type of reaction in which one reactant breaks out i.e decomposes into two or more products
eg : [tex]H_{2}CO_{3} - >[/tex][tex]CO_{2} + H_{2}O[/tex]
Therefore,
Just like a reactant splits or breaks into two or more products in a decomposition reaction the dancing couple in option b are also breaking up whereas no such split or breakup is mentioned in other options.
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An ion with 5 protons, 6 neutrons, and a charge of +3 has an atomic number of
O 8
O 6
O 5
O 3
ASAP HELP FOR BRAINLIST
The mass of a bowling ball is 3629 g and volume is 5280 ml. Find the density of the bowling ball and determine if it will sink or float in water?
Question 16 options:
Density of the bowling ball is 1.7 x 107, so it will sink in water as its density is greater than the density of water.
Density of the bowling ball is 1.7 x 107, so it will float in water as its density is lower than the density of water.
Density of the bowling ball is 0.688 g/ml, so it will float in water as its density is lower than the density of water.
Density of the bowling ball is 0.688 g/ml, so it will sink in water as its density is greater than the density of water.
Answer:
Option 3
Hope this helps!
How did the Coronaviridae family get its name?
I DON'T UNDERSTAND! PLEASE HELP.
Answer:
A would be the lowest, then C, and B would be the highest.
Explanation:
Elements tend to become more reactive as you move down the periodic table. This happens because the atoms become progressively larger and lose their hold on the outer eletrons more easily.
What is the wavelength of light in nm with energy of 4.41 x 10^-17 kj?
Answer: 21
Explanation:
identify five negative effects of acid precipitation
In the modern periodic table, the properties of elements are a
periodic function of their atomic numbers.
TRUE
FALSE
Answer:
true
Explanation:
Why cant you just add up the average masses, divide by three and get an atomuc mass?
Answer:
Differences are particle, nor does it measure their total mass as you did. particles and their relative abundances. It does not count each individual A mass spectrometer yields only information about the masses of atomic They are equal.
Explanation:
HOPE IT HELPS
what is the source of energy that provides the boost for electrons during photosynthesis
Answer:
The sun
Explanation:
The sun is the source of energy that provides the boost for electrons during photosynthesis
ILL GIVE YOU BRAINLIEST AND A 100 POINTS PLEASE HELP ... Dont answer if you dont know
Observe the substances in the test tubes for 15 minutes. In the table, describe what’s happening in each test tube, including any evidence of a chemical reaction.
Remember that evidence of chemical reactions can include change in color, change in smell, change in temperature, formation of a solid, or formation of bubbles. If there’s no observable change in a test tube, write “no reaction.”
pretty sure no reaction if it is wrong id like to give you back your points i can make up a question for u
H2(g) + I2(g) → 2HI(g)
A student makes the following statements:
Hydrogen always has the same oxidation number, so it has an oxidation number of +1 in both the reactant H2 and product HI.
Iodine is in Group VIIA, so it has an oxidation number of –1 in both the reactant I2 and product HI.
Neither hydrogen nor iodine changes oxidation states, so the reaction is not a redox reaction.
In three to five sentences, describe the mistake that the student made, and determine whether or not the reaction is a redox reaction. Explain your answer.
This problem is providing statements whereby an student is pretending to explain a wrongly-classified non-redox reaction via the change in the oxidation numbers the elements undergo as it takes place. It is asked to report where the student went wrong and to determine whether the reaction is redox or not.
In such a way, we can start by saying that the student was right about the +1 on H and -1 on I but just on HI, not on the diatomic gases too, because when the elements act alone in a chemical equation, their oxidation states must be 0 as they are not forming any ions.
Next, we can go over the identification of the reaction as redox, by writing the correct oxidation numbers in the considered chemical equation:
[tex]I_2^0(g)+H_2^0(g)\rightleftharpoons 2H^+I^-(g)[/tex]
Which exhibits an oxidation half-reaction for hydrogen because it changed from 0 to +1 and a reduction half-reaction for iodine because it changed from 0 to -1, and thus, when the oxidation numbers change, we say the reaction is redox.
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