Answer:
True
Explanation:
Differences in water density affect vertical ocean currents (movement of surface ocean water to the bottom of the ocean and movement of deep ocean water to the surface). … Denser water tends to sink, while less dense water tends to rise.
Differences in the density of seawater cause it to move. Therefore, the given statement is true.
What is density?The substance's mass per unit of volume is known as its density (volumetric mass density or specific mass). Although the Roman letter D may also be used, the sign most frequently used for density is (the lower case Greek letter rho). Density is calculated mathematically by dividing mass by volume.
Where m represents the mass, V is the volume, and is the density. Density is sometimes roughly characterized as weight every unit volume, while this is incorrect technically; this quantity is much more precisely known as specific weight. One example of this is in the US oil and gas business. Differences in the density of seawater cause it to move.
Therefore, the given statement is true.
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In a typical mammalian cell, the net transport by the sodium-potassium exchange pump that maintains the 70 mv membrane potential is 500 singly charged ions per second.
For a typical mammalian cell, the net transport by the sodium-potassium exchange pump, Work done is mathematically given as
W= 5.6*10-18 J
How much work does the pump do each second?Generally, the equation for the Potential difference is mathematically given as
Potential difference = Work done / Charge
Therefore
W=q*P.d
Q= 500 * 1.6*10-19 C
P.d. = 70 mV
In conclusion,Workdone
W500 * 1.6*10-19 * 70*10-3
W= 5.6*10-18 J
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SECOND TERM 2021/2022 HOLIDAY ASSIGNMENT
SUBJECT: CHEMISTRY CLASS SS1
1 (a) Define a salt
(b) The basicity of tetraoxosulphate VI acid is 2. Explain this statement with equation showing
the reaction between the acid and potassium hydroxide
2. Define buffer solution and give two uses of buffer solutions.
3. Explain and give an example each of
(a) Hygroscopy (b) Efflorescence (c) Deliquescence
4. The concentration of hydrogen ion H⁺ in two solutions are:
(a) 1 x 10⁻³moldm⁻³ and (b) 6 x 10⁻⁹moldm⁻³
What is the pH of each solution?
5. (a) Give three crystalline and four non-crystalline allotropes of carbon
(b) Give three differences between the two main crystalline allotropes of carbon.
1.
a) Salt: any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation.
Acid + alkali → salt + water
b)
Tetraoxosulfate (VI), SO2−4,SO42−, is the second conjugate base from the dissociation of sulfuric acid, H2SO4.H2SO4. This acid is a diprotic acid and thus can donate two protons in an aqueous solution to form HSO−4HSO4− after the first dissociation and SO2−4SO42− after the second dissociation.
The fact that tetraoxosulfate (VI) is dibasic means in terms of Brønsted-Lowry acid-base theory, the ion can accept two protons, or in other words, the parent acid donates two protons upon dissociation. This can be shown by the equation of the reaction between the parent sulfuric acid and potassium hydroxide where two hydrogens are replaced:
H2SO4+2KOH → K2SO4+2H2O
2. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many systems that use buffering for pH regulation.
For example, blood in the human body is a buffer solution.
Buffer Solutions are used for fermentation in the making of alcohol
I've only answered 1 & 2
help please giving brainliest!
Answer:
a reaction that can occur in both forward and reverse directions at the same time.
Explanation:
This is because ↓
A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously. A and B can react to form C and D or, in the reverse reaction, C and D can react to form A and B.
Hope this helps =)
Identify whether each compound is a straight chain, branched chain, or cycloalkane.
Answer:
the first one is branched, the second one is also branched and the third one is cycloalkane
Answer:
A: straight chain, B: branched chain, and C: cycloalkane.
Explanation:
Which compound below will readily react with a solution of bromine consisting of 48% hydrobromic acid and 30% hydrogen peroxide?
Answer:
cyclohexene I think that's the answer
Potassium chlorate decomposes to form potassium chloride and oxygen according to the following
equation:
2 KCIO3(s) + 2 KCl(s) + 3 O2(g)
How many grams of oxygen are produced if 244 grams of potassium chlorate decompose and 148
grams of potassium chloride are produced?
O 1.65 g
O 0.607 g
0 96.0 g
O 392 g
Answer:
O 392 g
Explanation:
39.2 grams of oxygen (O2) can be produced.
The concept stoichiometry is used here to determine the grams of oxygen produced. The amount of oxygen produced from the decomposition of 244 grams of potassium chlorate is 96.0 g . The correct option is C.
What is stoichiometry?The stoichiometry is an important concept in chemistry which helps us to use the balanced chemical equation to calculate the amount of reactants and products. Here we make use of the ratios from the balanced equation. It help us to understand how much substance is needed or present.
Here the balanced reaction is:
2 KCIO₃(s) + 2 KCl(s) + 3 O₂(g)
2 moles of KCIO₃ = 2(39 + 35.5 + 3 × 16) = 245 g
3 moles of O₂ = 3 × 2 × 16 = 96 g
245 g KCIO₃ produces 96 g O₂
Therefore 245 g gives 96 × 244/245 = 95.6 g ≈ 96.0 g
Thus the correct option is C.
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How many chromosomes do humans without chromosomal abnormalities have?
a)46
b)16
c)23
d)92
Answer:
A. 46
Explanation:
Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell .
If 162.35 g aluminum hydroxide are dissolved in 6750 mL of solution, what is the concentration of the solution?
If 162.35 g aluminum hydroxide are dissolved in 6750 mL of solution, the concentration of the solution is 0.308M
How to calculate concentration?The concentration of a solution can be calculated using the following formula:
Molarity = no of moles ÷ volume (L)
However, the number of moles in 162.35g of Al(OH)3 must be calculated as follows:
Molar mass of Al(OH)3 = 78g/mol
no of moles = 162.35g ÷ 78mol
no of moles = 2.08mol
Molarity = 2.08mol ÷ 6.75L
Molarity = 0.308M
Therefore, if 162.35 g aluminum hydroxide are dissolved in 6750 mL of solution, the concentration of the solution is 0.308M.
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The solubility of a gas is 0.890 g/L at a pressure of 120 kPa. What is the solubility of the gas if the pressure is changed to 100 kPa, given that the temperature is held constant?
For the solubility of a gas is 0.890 g/L at a pressure of 120 kPa, the solubility of the gas, if the pressure is changed to 100 kPa is mathematically given as
c=0.741g/l
What is the solubility of the gas if the pressure is changed to 100 kPa, given that the temperature is held constant?Generally, the equation for the Pressure is mathematically given as
p=kc
Therefore
k=p/c
k = 120 /0.890
k=134.8
In conclusion, if p=100kpa
c=p/k
c=100/134.8
c=0.741g/l
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identify a human activity that impacts the land negatively then describe a positive action that can help rude effects caused by the activity
giving brainiest
Consider the following balanced equation:
2KCIO3 → 2KCI + 302
How many grams of O2 will be obtained by decomposing
98.1 grams of KClO3?
A. 38.4 grams
B. 17.1 grams
C. 76.8 grams
D. 25.6 grams
What amount of heat is required to increase the temperature of 75.0 g of water from 22.3˚C to 36.1˚C?
Answer:
4332.5 j
Explanation:
Specific heat of water is 4.186 j /g-C
4.186 j / g-C * 75 g * (36.1-22.3 C) =
Draw the product of the reaction. Draw any hydrogens on oxygen and nitrogen, where applicable.
The product of the reaction will be polar in nature due to the bonds formed between hydrogen and oxygen or nitrogen.
What is a product of a reaction?The product of a chemical reaction is the substance which is formed at the end of the reaction by the reactant or reactants.
The product of a reaction can be formed from the rearrangement of atoms in a compound due to changes in the environment of that compound.
The product can also be formed by the addition or removal of atoms of the reactants.
In the example above, no reactant is shown, however the bonds formed between hydrogen and oxygen or nitrogen gives polarity to the product formed.
Hence, a reactant must be present for a product to be formed.
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Can anyone help me please
Answer:
Nucleic acids
Explanation:
all organic foods (fruit, meat, etc) contain it to some degree. because all organic foods have dna in them.
Why would a scientist need to know if there was a volcanic eruption about to happen?
What is the oxidation number of chromium in sodium dichromate, na2cr2o7?.
Answer:+6
Explanation:Oxygen always has an ON of -2 so when there’s O7 the total is -12. Sodium is in group 1 so has an ON of +1 that means with two of them it’s overall ON is +2. When you combine the two that equals -12 but you want it to equal 0. So it would be +12. Considering there are two chromium present you would divide that by 2 making the answer +6.
helpp
What also increases as the resistance in a longer wire increases?
A. Voltage
B. Charges
C. Temperature
D. Current
A sample of gas has a volume of 8.20 L at 0.750 atm and 375 K. What volume (in L) does the gas occupy at 817 torr and 325 K?
The new volume occupied by the sample of gas is 4.96L.
Given the data in the question;
Initila pressure; [tex]P_1 = 0.750atm[/tex]Final pressure; [tex]P_2 = 817torr = 1.075atm[/tex]Inital temperature; [tex]T_1 = 375K[/tex]Final temperature; [tex]T_2 = 325K[/tex]Initial Volume; [tex]V_1 = 8.20L[/tex]Final Volume; [tex]V_2 = \ ?[/tex]
Combined gas lawCombined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
To calculate the new volume the gas occupy, we subtsitute our given values into the expression above.
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\ \\ P_1V_1T_2 = P_2V_2T_1\\\\0.750atm * 8.20L * 325K = 1.075atm * V_2 * 375K\\\\1998.75LatmK = 403.125atmK * V_2\\\\V_2 = \frac{1998.75LatmK}{403.125atmK} \\\\V_2 = 4.96L[/tex]
Therefore, the new volume occupied by the sample of gas is 4.96L.
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" The use of insecticide is not an interest but an obligation". justify the statement
Answer:
Insecticides are not good for health. Their use is harmful to other animals, birds and humans. But, without their use, it is not possible to grow the required amount of food. So, "the use of insecticide is not an interest, but an obligation".
Which is older? Dinosaurs or Grasshoppers?
Answer:
i think grass hopper
Explanation:
answer my question i am am brainiest
If 25.0 g NO are produced, how many grams of nitrogen gas are used?
A: 5.84 g
B: 11.7 g
C: 23.3 g
D: 33.6 g
Based on the assumption that the reaction involves N and O to produce NO, if 25.0 g of NO are produced, the amount of N gas used would be 11.66 grams
Stoichiometric calculationFrom the equation of the reaction:
N + O ---------> NO
Mole ratio of N to NO is 1:1
Mole of 25.0 g of NO = 25/30.01 = 0.833 moles
Equivalent mole of N = 0.833 moles
Mass of 0.833 moles N = 0.833 x 14 = 11.66 grams
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3.0 Liters of gas at a pressure of 0.90 atm is compressed to 2.0 atm.
What is the new volume?
Answer:
5.5 L
Explanation:
Question 4 of 10
Match the feature with its description.
Sinkholes
?
Hang from cave ceilings.
Stalagmites
?
Grow from cave floors.
Stalactites
?
Collapsed caves.
Speleothems
?
Cave features.
Speleothems
Answer:
Stalactites - Hang from caves ceilings
Stalagmites - Grow from cave floors
Sinkholes - Collapsed caves
Speleothems - Cave features
Explanation:
Got it right :)
what are the units on avogardo’s number
Answer:
I believe they are electrons, atoms, ions, or molecules.
Explanation:
Is apologize if it is incorrect-
I hope it helps! Have a great day!
Muffin~
Answer:
Units:
electrons
ions
atoms
molecules
Explanation:
I hope it helps!
Have a great day!
<3
which word help the reader understand the meaning of stratum in paragraoh 3.
Answer:
It should be D
Explanation:
Stratum is a layer of rock in the ground
Which conditions will increase the rate of a chemical reaction?.
Answer:
temperatures
enzyme activity
How many atoms in total are present in sucrose C12H2011 weighs 1.4 mg
Answer:
2.46×10²¹atoms
Explanation:
[tex]molar \: mass \: of \: the \: sucrose = 12(12) + 22(1) + 11(16) \\ = 144 + 22 + 176 \\ = 342g {mol}^{ - 1} \\ mole = \frac{1.4 \times {10}^{ - 3} }{342} \\ = 4.09 \times {10}^{ - 6} \\ number \: of \: atoms = 4.09 \times {10}^{ - 6} \times 6.022 \times {10}^{23} \\ = 2.46 \times {10}^{21} atoms[/tex]
Explain what the color change indicated about the changes in the concentrations of Co(H2O)62+ and CoCl42– in each trial.
Trail one
starting color: purple
added 3 drops of Hcl(aq)
end color:blue
Trail two
start color is :blue
added 3 drops of AgNOv3(aq)
and White stuff forms at the bottom.
end color is: light pink
Addition of HCl leads to te formation of blue CoCl4^2– while the addition of AgNO3 leads to the formation of pink Co(H2O)6^2+.
What is equilibrium?Dynamic equilibrium is said to have been attained in a reaction when the rate of forward reaction is equal to the rate of reverse reaction. Now we have the equilibrium as shown in the image attached.
When we add HCl as in trial 1, the equilibrium position is shifted to the left and blue CoCl4^2– is formed. When we add AgNO3, the Cl^- is precipitated out of solution and the equilibrium shifts towards the left to yield pink Co(H2O)6^2+.
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How many moles in 16 grams of oxygen?
Answer:
Half mole or 0.5 moles
__________________________________________________________
SolveOxygen has a molar molar mass of 32 g.
This means that O2 will have half that amount of grams, half-mole-substance.
6.022*10^23 molecules are present in one mole of any substance, so half it for O2.
6.022 × 10²³ [tex]-- >[/tex] 3.011 × 10²³
And simplified, that would make your answer 0.5 moles.
________________________________________________________
Questions?Ask in the comments box, please.
Name the cycloalkane.
CH3
CH3
CH3
trimethyl nonane
Explanation:
