the density increases down the group.
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 .
How many atoms are in 12.01 g of C? (Please show the steps! Thank you!)
Answer:
6.02 x 1023
Explanation:
Its numerical value is 6.02 x 10 (23). Therefore, a 12.01 g sample of carbon contains 6.02 x 10 (23) carbon atoms.
If you are given a 0. 32 g piece of sodium metal to react with water, how many moles of hcl would it take to neutralize the sodium hydroxide produced?.
Answer:
.0139
Explanation:
The number of moles of HCl would take to neutralize the sodium hydroxide produced is equal to 0.0139 moles.
What is a neutralization reaction?A neutralization reaction can be defined as a chemical reaction in which an acid and base react with each other to prepare salt and water.
When HCl reacts with NaOH and the resulting salt is sodium chloride and water.
HCl + NaOH [tex]\longrightarrow[/tex] NaCl + H₂O
The chemical reaction, chemical reaction of sodium metal and water gives hydrogen gas and sodium hydroxide:
[tex]2Na+ 2H_2O \longrightarrow 2NaOH + H_2[/tex]
Given the amount of sodium metal = 0.32 g
The moles of sodium metal = 0.32/23 = 0.0139 moles
If the 2 moles of sodium produce sodium hydroxide = 2 mol
The 0.0139 moles of sodium will produce NaOH = 0.0139
Therefore, 0.0139 moles of HCl is required to neutralize 0.0139 moles of NaOH.
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Name the cycloalkane.
CH3
CH3
CH3
trimethyl nonane
Explanation:
Why would a scientist need to know if there was a volcanic eruption about to happen?
Which of the following ionic compounds has a transition metal in it?
a. KOH
b. Cs2S
c. CuSO4
d. MgCl2
Answer:
Ca2s that is answers and CuSO4is
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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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
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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Which is older? Dinosaurs or Grasshoppers?
Answer:
i think grass hopper
Explanation:
answer my question i am am brainiest
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
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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Why does the entropy of a gas increase when it expands into a vacuum?.
Answer:
When a gas expands into a vacuum, its entropy increases because the increased volume allows for greater atomic or molecular disorder. The greater the number of atoms or molecules in the gas, the greater the disorder.
Explanation:
7. Complete the following equations. [2]
a. Sodium + Water ______________________ + Hydrogen
b. Copper carbonate + Sulfuric acid _____________________ +_____________ + Carbon dioxide
c. Sulfur + _________________ Sulfur dioxide
Answer:
Sodium + water --› Sodium hydroxide + hydrogen gas
Copper carbonate + sulphuric acid --› Copper sulphate + water + carbondioxide
Sulphur + Oxygen --› Sulphur dioxide
PLEASE MARK ME BRAINLIEST
Explain the difference between current electricity and magnetism.
Answer:
Electricity can be present in a static charge, while magnetism's presence is only felt when there are moving charges as a result of electricity. In simple words, electricity can exist without magnetism, but magnetism cannot exist without electricity.
HOPE THIS HELPS, HAVE A GREAT DAY!!~
Explanation:
Why are water and hydrogen peroxide different substances even though they are both made up of hydrogen and oxygen atoms?
NaOH was adde to a 7.75 x 10^-3 M solution of HCl so that the end solution has a pH of 3.500. What is the positive difference in concentration of [H3O+]
Answer:
concentration [H_3O^+][H3O+] decreased by 4.46334\sdot10^{-4}M.4.46334⋅10−4M.
Explanation:
pH=−log[H3O+]; [H_3O^+]=10^{-pH};[H3O+]=10−pH;
If pH=3.350;pH=3.350;
[H_3O^+]=10^{-3.35}=4.467\sdot10^{-4}M;[H3O+]=10−3.35=4.467⋅10−4M;
If pH=6.780;pH=6.780;
[H_3O^+]=10^{-6.78}=1.66\sdot10^{-7}M;[H3O+]=10−6.78=1.66⋅10−7M;
4.467\sdot10^{-4}-1.66\sdot10^{-7}=4467\sdot10^{-7}-1.66\sdot10^{-7}=4465.34\sdot10^{-7}=4.467⋅10−4−1.66⋅10−7=4467⋅10−7−1.66⋅10−7=4465.34⋅10−7=
=4.46534\sdot10^{-4}M;=4.46534⋅10−4M;
The positive difference in concentration of [[tex]H_3O^+[/tex]] is [tex]4.46534 X 10^{-4}M[/tex] when NaOH was added to a 7.75 x [tex]10^-3[/tex] M solution of HCl so that the end solution has a pH of 3.500.
What is concentration?It is the measure of how much of a given substance there is mixed with another substance.
pH=−log[[tex]H_3O^+[/tex]]
[[tex]H_3O^+[/tex]]=[tex]10^{-pH}[/tex]
[[tex]H_3O^+[/tex]]=[tex]10^-^p^H[/tex]
If pH=3.350
pH=3.350
[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]=[tex]4.467 X 10^{-4}M[/tex]
[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]
=[tex]4.467 X 10^{-4}M[/tex]
If pH=6.780
pH=6.780
[[tex]H_3O^+[/tex]]= [tex]10^{-6.78}[/tex]=[tex]1.66 X 10^{-7}M[/tex]
Hence, the positive difference in concentration of [[tex]H_3O^+[/tex]] is[tex]= 4.46534 X 10^{-4}M[/tex]
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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 :)
" 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".
Describe the change of state using kinetic theory
Explanation:
According to kinetic molecular theory,changes of the state of matter occur when energy is added or removed from a substance
According to the Kinetic-Molecular Theory, changes of the state of matter occur when energy is added or removed from a substance. The addition of energy makes particles move more, pushing them apart and weakening the bonds between them. Removing energy makes particle movement slow down, re-forming the bonds.
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 conditions will increase the rate of a chemical reaction?.
Answer:
temperatures
enzyme activity
helpp
What also increases as the resistance in a longer wire increases?
A. Voltage
B. Charges
C. Temperature
D. Current
Which of the following describes carbohydrates?
Answer:
They are converted into glucose, they are a source of energy for the body
Explanation:
that's the answer
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.
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
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
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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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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