Answer:
d, the remains of an organism have to be 10,000 years old to be classified as a fossile:)
Answer:
(d)
Explanation:took the quiz
How
many mols are in 151 g of dinitrogen monoxide?
Answer:
3.43 moles
Explanation:
To convert moles into grams you must take the number of grams and divide it by the atomic mass of the compound.
in this case, grams is 151 and N2O has an atomic mass of 44.013
so your equation would look like
151/44.013=3.430804535
your answer would be 3.43 moles
What is the mass of 2.90 ×1022 formula units of NaOH (Molar mass = 40.0 g/mol)?
[tex]\text{mass of NaOH = 2.90 × 10²² NaOH formula units} × \frac{\text{1 mol NaOH}}{\text{6.022 × 10²³ NaOH formula units}} × \frac{\text{40.0 g NaOH}}{\text{1 mol NaOH}}[/tex]
[tex]\boxed{\text{mass of NaOH = 1.926 g}}[/tex]
Answer:
[tex]\boxed {\boxed {\sf 1.93 \ g \ NaOH}}[/tex]
Explanation:
1. Convert Formula Units to Moles
To do this, we use Avogadro's Number: 6.02*10²³. It is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, it is formula units of sodium hydroxide.
[tex]\frac {6.02*10^{23} \ formula \ units \ NaOH}{1 \ mol \ NaOH}[/tex]
Multiply by the given number of formula units.
[tex]2.90*10^{22} \ formula \ units \ NaOH*\frac {6.02*10^{23} \ formula \ units \ NaOH}{1 \ mol \ NaOH}[/tex]
Flip the ratio so the formula units will cancel.
[tex]2.90*10^{22} \ formula \ units \ NaOH*\frac {1 \ mol \ NaOH}{6.02*10^{23} \ formula \ units \ NaOH}[/tex]
[tex]2.90*10^{22}*\frac {1 \ mol \ NaOH}{6.02*10^{23}}[/tex]
[tex]\frac {2.90*10^{22} \ mol \ NaOH}{6.02*10^{23}}=0.04817275748 \ mol \ NaOH[/tex]
2. Convert Moles to Grams
For this, we use the molar mass. It is the grams per mole of a substance. We are given this value for sodium hydroxide: 40.0 g/mol
[tex]\frac {40.0 \ g\ NaOH}{1 \ mol \ NaOH}[/tex]
Multiply by the moles we calculated.
[tex]0.04817275748 \ mol \ NaOH*\frac {40.0 \ g\ NaOH}{1 \ mol \ NaOH}[/tex]
The moles cancel.
[tex]0.04817275748 *\frac {40.0 \ g\ NaOH}{1 }[/tex]
[tex]0.04817275748 *{40.0 \ g\ NaOH=1.926910299 \ g\ NaOH[/tex]
3. Round
The original measurement of formula units has 3 significant figures, so our answer must have the same. For the number we calculated that is the hundredth place.
[tex]1.92\underline6 910299 \ g \ NaOH[/tex]
The 6 in the thousandth place tells us to round the 2 to a 3.
[tex]1.93 \ g \ NaOH[/tex]
There are approximately 1.93 grams of sodium hydroxide.
Can somebody please help me!!
Answer:
position
Explanation:
The position of an object is its location in a space.
A sample of N 2 gas has a volume of 30.0 ml at 25 degrees * C and 730 mmHg. What would be the volume of the gas at 50 ^ 0 * C and 1 atm pressure? a. 31.2 ml b. 26.6 mL c. 33.9 ml d. 57.6 ml
Answer:
your answer is D. 57.6
Explanation:
730+30.0+25+2=
According to Boyle's law, what will happen to the volume of a gas if its pressure decreases and its temperature stays constant? A it's volume will change shape. B) its volume will increase C) it's volume will not be affected by the change in pressure D) it's volume will decrease
How many grams are in 5 moles of calcium fluoride (CaF2)?
Answer:
1 moles Calcium Fluoride = 78.0748064 gram using the molecular weight calculator and the molar mass of CaF2.
Which ones are soluble in water and which ones are not soluble in water.
a. NH4CH3COO Ammonium acetate soluble
b. Ba(OH)2 Barium hydroxide soluble
c. FeCO3 Iron (II) Carbonate insoluble
d. NaOH Sodium hydroxide soluble
e. RbNO3 Rubidium nitrate soluble
Answer:
d. NaOH Sodium hydroxide soluble
write the chemical equation of sodium reacts with hydrochloric acid
Answer:
NaOH + HCl → H2O and NaCl.
Explanation:
plzz mark as brainliest
Answer:
NaOH + HCl → H2O and NaCl.
Explanation:
I'm not sure 100%, but I think so...
It is possible to convert moles to particles by doing what
with recessions government spending should
decrease
increase
or allowed to remain the same increased
Answer:
Increase to pay unemployment and get the economy back up
what changes would you see in the colour of litmus paper in lemon,ash and blood
Answer:
Colour of litmus papers in lemon:
Blue litmus- Red
Red litmus- No change
Really sorry but don't know about others
Litmus paper indicator shows following color changes for lemon it is, blue litmus to red, for ash and blood it is red litmus to blue indicating their acidic nature in case of lemon and alkaline nature in case of ash and blood.
What is an indicator?Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.
These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:
1) natural indicators
2) synthetic indicators
3) olfactory indicators.
These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.
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What is thisssssssssss
Answer:
2Explanation:
As,
Mg + 2HCl ----> MgCl2 + H2
Which makes the equation balanced.
Endocrine glands release chemicals that are also known as ___. a. target cells. b. hypothalamus. c. lymph. d. hormones. Please select the best answer from the choices provided A B C D
Answer:
Endocrine glands release chemicals that are also known as hormones.
Explanation:
Hope this helped!!!
Answer:
D. Hormones
Explanation:
The Endocrine system deals with all things hormones such as growth development and anything else dealing with puberty
If a drum skin vibrates with a frequency of 100 Hz, how many times does it move up and down each second?
( Chemistry )
An unknown solid is entirely soluble in water. On addition of dilute HCl, a precipitate forms. After the precipitate is filtered off, the pH is adjusted to about 1 and H2S is bubbled in; a precipitate again forms. After filtering off this precipitate, the pH is adjusted to 8 and H2S is again added; no precipitate forms. No precipitate forms upon addition of (NH4)2HPO4. The remaining solution shows a yellow color in a flame test.
Based on these observations, which of the following compounds might be present, which are definitely present, and which are definitely absent.
CdS, Pb(NO3)2, HgO, ZnSO4, Cd(NO3)2, and Na2SO4
Answer:
Pb(NO3)2
Cd(NO3)2
Na2SO4
Explanation:
In the first part, addition of HCl leads to the formation of PbCl2 which is poorly soluble in water. This is the first precipitate that is filtered off.
When the pH is adjusted to 1 and H2S is bubbled in, CdS is formed. This is the second precipitate that is filtered off.
After this precipitate has been filtered off and the pH is adjusted to 8, addition of H2S and (NH4)2HPO4 does not lead to the formation of any other precipitate.
The yellow flame colour indicates the presence of Na^+ which must come from the presence of Na2SO4.
when the energy is released what happens to the energy of the system
Answer:
Whether a chemical reaction absorbs or releases energy, there is no overall change in the amount of energy during the reaction. That's because energy cannot be created or destroyed. This is the law of conservation of energy.
What is biocapacity?
Answer: Biocapacity is the ecosystems' capacity to produce biological materials used by people and to absorb waste material generated by humans, under current management schemes and extraction technologies.Biocapacity is usually expressed in global hectares.
Explanation:
what is the molecular formula of the molecule thay has an empirical formula of CH20and a molar mass of 240.2 g/mol?
C8H16O8
Explanation:
(CH2O)n=240.2
=12n+2n+16n=240.2
=30n=240.2
n=8
C8H16O8
By which method the following mixture can be separated?(i)mixture of colours (ii) Minerals oil.
the answer ie the second option
Minerals oil
what kinda of water movement helps the fishing industry
Answer:
Upwelling is the natural process which brings cold, nutrient-rich water to the surface. A huge upwelling regularly occurs off the coast of Peru, which enjoys a large fishing industry as a result. Upwelling is a process in which currents bring deep, cold water to the surface of the ocean.
Explanation:
good luck
How many grams are in 32.2 L of CO2?
Answer:
63.25 grams of CO₂
Explanation:
To convert from liters to grams, we first need to convert from liters to moles. To do this, we divide the liters by 22.4, the amount of liters of a gas per mole.
32.2 / 22.4
= 1.4375 moles of CO₂
Now we want to convert from moles to grams. To do this, we multiply the moles by the molar mass of CO₂. The total molar mass can be found on the periodic table by adding up the molar mass of carbon (12) and two oxygen (32).
12 + 32 = 44
Now we want to multiply the moles by the molar mass.
1.4375 • 44
= 63.25 grams of CO₂
This is your answer.
Hope this helps!
PLEASEEEE HELLPPP I CANT FAILL PLSS
A bolt of lightning is an example of static discharge.
TRUE
FALSE
Answer:
True
Explanation:
i cant help you with math and science homework or project just email at shahlaalgow g mail com
Answer:
thanks
Explanation:
When an organism eats a plants,the energy and nutrients stored in the consumed organism flows up to the____level
Answer:
Energy is transferred between trophic levels when one organism eats another and gets the energy-rich molecules from its prey's body.
Explanation:
The flow of energy in an ecosystem is always linear ie uni direction. At each energy step in food chain, the energy received by the organisms is used for its own metabolism and maintenance. The left over energy is passed to next higher trophic level. Thus the energy flow decreases with successive trophic level.
What are two main ways that water is being polluted or wasted
Answer:
Chemical waste from factories is sometimes dumped into rivers and lakes, or directly into the ground. Pesticides (chemicals that kill insects) applied to farmland enter surface water and groundwater, often in large quantities. Leaks from underground storage tanks for liquids like gasoline go directly into groundwater.
Explanation:
Hope it helps! Correct me if I am wrong!
Im sure about my answer!
If you dont mind can you please mark me as brainlest?
Is liquid ammonia a household acid?
Yes it is an cleaning product
Answer:
yes
Explanation:
it cleans in the house
3,01 x 10^23molecules H.O
Answer:
Therefore Mass of 6.022 x10^23 molecules= 32 g.
Explanation:
Write the IUPAC names of the given carboxylic acids. A molecule has the condensed formula C H 3 C H 2 C H (O C H 3) C H 2 C O O H. IUPAC name: A six membered hydrocarbon ring with three double bonds. The group C O O H is attached to ring carbon one, and a chlorine atom is attached to ring carbon four. IUPAC name:
Answer:
The correct answer is -
3-methoxypentanoic acid, and
4-chlorobenzoic acid
Explanation:
1. condensed formula of the molecule is -
CH3CH2CH(OCH3)CH2COOH and the number of the carbons would be count from the end of carboxylic acid. So, the counting as given in the image, it shows there are 5 carbon so it is Penta and has methyl group on fourth carbon so 4-methyl, therefore, its IUPAC name will be - 4-methyl pentanoic acid
2. similarly for the molecule with COOH group attached with ring carbon and chlorine is represented as in the image and it shows a benzene ring and COOH group is present at C1 and chlorine is in C4 so the name would be 4-chlorobenzoic acid.
The International Union of Pure and Applied Chemistry (commonly abbreviated to IUPAC) recommends a systematic approach for the nomenclature of organic compounds, which is referred to as the IUPAC nomenclature of organic compounds. Here the IUPAC names are 4-methyl pentanoic acid and 4-chlorobenzoic acid.
In essence, the condensed structural formula is a system for writing organic compounds in a single line of text.
1. CH₃CH₂CH(OCH₃)CH₂COOH and the number of the carbons would be counted from the end of carboxylic acid. So, the counting as given in the image shows there are 5 carbon so it is Penta and has methyl group on the fourth carbon so 4-methyl, therefore, its IUPAC name will be - 4-methyl pentanoic acid
2. Similarly the molecule with COOH group attached with ring carbon and chlorine is represented as in the image and it shows a benzene ring and COOH group is present at C-1 and chlorine is in C-4 so the name would be 4-chlorobenzoic acid.
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HELPPPPP ASAP PLEASEEE
Answer:
c
Explanation:
Involuntary muscles, like skeletal muscles, help move the bones
Answer:
the second and last one is correct
since bones protect our internal organs like heart, pancreas,etc and give the body its shape
Explanation:
second point it is true that in our body there are more than 600 muscles and the bones are about 206 I think
