Answer:
Sounds great
Explanation:
Probably fake but you never know do you
if i weigh 180 pounds on earth, what will i weigh on the moon?
Answer:
about 30 pounds
Explanation:
The mass of someone on the Moon would be 1/6 of the weight of Earth.
So, 180 ÷ 1/6 = 30.
Hope this helps you!
The answer is 30 pounds because if you weigh an amount of mass on the etah you will weigh 1/6 of it on the moon.
1) What mass of Na2CO3 is required to make 50cc of its seminormal solution?
Answer:
[tex]m=1.325gNa_2CO_3[/tex]
Explanation:
Hello,
In this case, by considering the given seminormal solution, we infer it is a 0.5-N solution which means that we can obtain the equivalent grams as shown below for the 55 cc (0.055 L) volume:
[tex]eq-g=0.5eq-g/L*0.050L=0.025eq-g[/tex]
Next, since sodium carbonate has two sodium ions with a +1 oxidation state each, we can obtain the moles:
[tex]mol=0.025eq-gNa_2CO_3*\frac{1molNa_2CO_3}{2eq-gNa_2CO_3}\\ \\mol=0.0125molNa_2CO_3[/tex]
Finally, the mass is computed by using its molar mass (106 g/mol)
[tex]m=0.0125molNa_2CO_3*\frac{106gNa_2CO_3}{1molNa_2CO_3} \\\\m=1.325gNa_2CO_3[/tex]
Regards.
Which describes the correct procedure when converting a number from scientific notation to standard notation? A If the power of 10 is positive, move the decimal point to the left. BIf the power of 10 is positive, move the decimal point to the right. CIf the number being converted is greater than 10, move the decimal point to the left. DIf the number being converted is greater than 10, move the decimal point to the right.
Answer:
I think it's B
Explanation:
I think it is b because if the number is positive the zeroes will be on the left so you move the decimal to the right to get rid of the zeroes.
Which acid-base pairs would be best for preparing a buffer solution with a PH of 8.15?
Answer:
HCN - CN⁻ (pair #4)
Explanation:
Hello,
In this case, for the selection of best pair for the preparation of the buffer solution with a pH of 8.15 we need to look for the one having the pKa closest to the required pH, considering the Henderson-Hasselbach equation:
[tex]pH=pKa+log(\frac{[base]}{[acid]} )[/tex]
In such a way, among the options, the pair HCN - CN⁻ (#4) has a pKa of 9.39 which is the closest in comparison to the others, taking into account the we will look for a [base]/[acid] ratio approaching 1.
Best regards.
Empirical evidence about rocks might be collected by a blank doing blank
Answer:
Researchers gather empirical evidence through experimentation or observation. Empirical evidence is information acquired by observation or experimentation. Scientists record and analyze this data
Answer: chemist
Explanation:
f the toxic quantity is 1.5 g of ethylene glycol per 1000 g of body mass, what percentage of ethylene glycol is fatal
Answer:
0.15%
Explanation:
mass of ethylene glycol per 1000 g = 1.5 g
percentage of ethylene glycerol that is fatal = gram of ethylene/gram of the body
==> 1.5/1000 x 100% = 0.15%
The element rubidium forms a _______ with the charge . The symbol for this ion is , and the name is . The number of electrons in this ion is .
Answer:
The element rubidium forms a cation with a charge of +1. The symbol of this ion is Rb+, and the name is rubidium ion. The number of electrons in this ion is 36 electrons
Explanation:
Rubidium belongs to the group 1A of the periodic table of elements. It is an alkali metal. The rubidium atom has an atomic number of 37. The neutral atom also has 37 electrons.
Being a metal, it forms ions by the loss of electrons. Since it is an alkali metal, it has one valence shell electron. It loses this one electron to form the rubidium ion, Rb+ which then has 36 electrons.
4.80 qt is the same as how many mL?
Answer:
1qt is the same as 946.35mL
Explanation:
4.80 US liquid quart is equal to 4542. 49 mL.
What is a US liquid quart?A quart is a unit for capacity used in the Imperial British and the U.S. Customary systems of measurement. It is used for both liquid and dry measurements, one standard quart is used in the British system. This is equal to two imperial pints, or one-fourth of the imperial gallon.
This is 69.36 cubic inches or 1,136.52 cubic cm. The U.S. system of measurements has two units for a quart. One is used for the liquid measurements and a slightly larger unit is used for the dry measurements.
The U.S. liquid quart unit is equal to two liquid pints, or one-fourth U.S. gallon. This is 57.75 cubic inches or 946.35 cubic cm. The dry quart is equal to two dry pints, or 1/32 bushel. This is 67.2 cubic inches or 1,101.22 cubic cm.
In this case, 1 US quart = 946.353 ml
So, 4.80 liquid quart = 4542.49 ml.
Therefore, 4.80 US liquid quart is equal to 4542. 49 mL.
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Which question is most important to developmental psychology?
A. How much do parents influence who a child becomes?
B. How can violent conflicts be prevented?
C. How does brain chemistry affect how we feel and act?
D. How can people change their thinking and behavior?
Answer:
For much of the past century, scientists studying drugs and drug use labored in the shadows of powerful myths and misconceptions about the nature of addiction. When scientists began to study addictive behavior in the 1930s, people with an addiction were thought to be morally flawed and lacking in willpower. Those views shaped society’s responses to drug use, treating it as a moral failing rather than a health problem, which led to an emphasis on punishment rather than prevention and treatment.
Today, thanks to science, our views and our responses to addiction and the broader spectrum of substance use disorders have changed dramatically. Groundbreaking discoveries about the brain have revolutionized our understanding of compulsive drug use, enabling us to respond effectively to the problem.
As a result of scientific research, we know that addiction is a medical disorder that affects the brain and changes behavior. We have identified many of the biological and environmental risk factors and are beginning to search for the genetic variations that contribute to the development and progression of the disorder. Scientists use this knowledge to develop effective prevention and treatment approaches that reduce the toll drug use takes on individuals, families, and communities.
Despite these advances, we still do not fully understand why some people develop an addiction to drugs or how drugs change the brain to foster compulsive drug use. This booklet aims to fill that knowledge gap by providing scientific information about the disorder of drug addiction, including the many harmful consequences of drug use and the basic approaches that have been developed to prevent and treat substance use disorders.
At the National Institute on Drug Abuse (NIDA), we believe that increased understanding of the basics of addiction will empower people to make informed choices in their own lives, adopt science-based policies and programs that reduce drug use and addiction in their communities, and support scientific research that improves the Nation’s well-being.
Answer:
D
Explanation:
Volume pressure= .785 liters
Unknown 1 = 1884 torr
Unknown 2 = 847 torr
Now that the volume of the pressure vessel is known, the number of moles H2 gas formed can be determined for the unknown samples. Enter the corrected gas pressure after subtracting the water vapor pressure for unknowns 1 and 2
Unknown 1 corrected pressure?
Unknown 2 corrected pressure?
Use the ideal gas equation and the volume obtained above to calculate the number of moles H2 gas produced during each unknown run. Assume again that the gas temperature at the end of each run is 22 degrees C
Unknown 1?
Unknown 2?
Divide the sample mass by the number of moles of H2, calculated above to determine the ratio of sample mass to number of moles of H2, produced.
Answer:
corrected pressure : unknown 1 = 2.452 Atm, unknown 2 = 1.088 atm
number of moles : unknown 1 = 0.079 moles unknown 2 = 0.035263 moles
Explanation:
Given data:
volume pressure = 0.785 liters
Unknown 1 = 1884 torr (1884 mmhg )
Unknown 2 = 847 torr ( 847 mmhg )
vapor pressure at 22⁰c = 19.8 mmhg
Determine the number of moles of H2 gas for the unknowns
unknown corrected pressure for unknown 1 = total pressure - vapor pressure = 1884 - 19.8 = 1864.2 mmhg / 760 = 2.452 Atm
no of moles = PV / RT
T = 22 + 273.15 = 295.15 k
P = 2.452 atm
R = 0.08206L.atm/mole.K
v = 0.785
number of moles = (2.452 * 0.785 ) / (0.08206 * 295.15 ) = 0.079 moles of
Unknown corrected pressure for unknown 2 = total pressure - vapor pressure = (847 - 19.8 ) / 760 = 1.088 atm
number of moles = PV / RT
T = 22 + 273.15 = 295.15 k
R = 0.08206L.atm/mole.K
v = 0.785
P = 1.088 atm
number of moles = (1.088 * 0.785 ) / (0.08206 * 295.15 ) = 0.035263 moles
B ) determine the ratio of sample mass to number of moles
molar mass of H2 = 2.01588 g/mole
for unknown 1 = 2.01588 / 0.079 = 25.51
for unknown 2 = 2.01588 / 0.035263 = 57.167
Ava's best friend has an indoor cat. Ava notices that she sneezes every time that she visits her friend. Ava suspects
that she is allergic to cats but is unsure. What is the best thing for Ava to do next?
O Stop visiting her friend.
O Conclude that she is allergic to cats, and avoid them completely
O Test her suspicion by checking to see whether other cats also make her sneeze,
O Assume that the sneezing has another cause, and reject her original idea.
Answer:
test her suspicion by checking to see whether other cats also make her sneeze
Write the chemical symbols for three different atomic anions that all have 34 protons.
Answer:
Explanation:
First of all it should be noted that number of protons is called atomic number in chemistry. The atom that has the atomic number of 34 in the periodic table is Selenium (Se). Anions are negatively charged atoms; the negative charge means the atoms have lost electron(s) while still having the same number of protons.
From the above, we can deduce that the only atom that can have 34 protons is Se and for it to become negatively charged (anion), it must lose electron(s).
The different chemical symbols thereof will be Se⁻,Se²⁻, Se³⁻ if it loses one, two or three electrons respectively while still having the atomic number of 34
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What is the number at the end of an isotope's name?
O atomic number
O neutron number
O mass number
O electron number
Answer:
c. mass number
Explanation:
Answer:
c mass number tell me if its right
Explanation:
Two cars of mass 3000 kg are 2 m apart. What is the force of gravity between the two?
if an atom has 17 protons and 18 neutrons, what is the charge of the atom's nucleus?
dont need time cause time waiting on nobody
2 N2 (g) + O2 (g) ---> 2 N2O (g) H= +163.2 kj/mol
How much heat is required to produce 25.0 g of N2O by this reaction? Show all calculations.
Answer:
46.3 kJ
Explanation:
Step 1: Write the thermochemical equation
2 N₂(g) + O₂(g) ⇒ 2 N₂O(g) ΔH= +163.2 kJ/mol
Step 2: Calculate the moles corresponding to 25.0 g of N₂O
The molar mass of N₂O is 44.01 g/mol.
25.0 g × (1 mol/44.01 g) = 0.568 mol
Step 3: Calculate the heat released when 0.568 moles of N₂O are produced
According to the thermochemical equation, 163.2 kJ are required per 2 moles of N₂O.
0.568 mol × (163.2 kJ/2 mol) = 46.3 kJ
Suppose a scientist is working to develop a new waterproof, breathable fabric for hiking boots. This is an example of ______.
Help me plz
Answer:
Product developmentExplanation:
Product development includes a product's entire journey, from Identifying a market need to conceptualizing and designing the product.
Creating a new software, designing a new tool or machine, designing and bringing new smartphones or gaming consoles to the market, designing and producing a new type of shoe, all are examples of product development.
There are five phases of product development : idea generation, screening, concept development, product development and commercialization.
Help! It’s for chemistry I attached a picture thank you!
Answer:
0.15 L
Explanation:
You need to first find the volume of the container. You can do this by dividing the mass by the density. This will give you the mass in mL.
5.00 kg = 5,000 g
(5,000 g)/(1.00 g/mL) = 5,000 mL
5,000 mL = 5 L
Now, find the volume the seawater will take up.
(5,000 g)(1.03 g/mL) = 4854.4 mL
4854.4 mL = 4.85 L
Subtract the two volumes to find the volume that left unfilled.
5 L - 4.85 L = 0.15 L
Abby fills a graduated cylinder with 3 mL of water. She then drops a
small rock into the cylinder, and the water level rises to the 5 ml
mark. What is the volume of the rock?
mL
Answer: 2ML
Explanation: all you needed to do was to subtract
Sulfur hexachloride is an ionic compound. True False
Sulfur hexachloride is not an ionic compound, it is a covalent compound.
Ionic compounds are formed by the bond of metals with nonmetals, in which metals lose electrons to nonmetals that gain electrons. In that way, they all complete their octets.
Covalent compounds are formed by the bond between nonmetals, in which both nonmetals share pairs of electrons to complete their octets.
Sulfur hexachloride (SCl₆) is formed by 2 nonmetals, sulfur and chlorine. Thus, it is not an ionic compound but a covalent one.
Sulfur hexachloride is not an ionic compound, it is a covalent compound.
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Considering the redox reaction Cr + Ni²⁺ → Cr³⁺ + Ni, how many electrons are transferred in the balanced reaction?
Answer:
The correct answer is : 6 electrons
Explanation:
From the reduction-oxidation reaction, we identify the half-reactions:
Oxidation reaction: Cr (oxidation number= 0) loses 3 electrons and forms the cation Cr³⁺.
Cr → Cr³⁺ + 3 e-
Reduction reaction: the cation Ni²⁺ gains 2 electrons to form Ni (oxidation number= 0).
Ni²⁺ + 2 e- → Ni
We write the two half-reactions together and we multiply the reduction reaction by 3 and the oxidation reaction by 2 to obtain the same quantity of electrons in each half-reaction: 6.
(Ni²⁺ + 2 e- → Ni) x 3
(Cr → Cr³⁺ + 3 e-) x 2
-------------------------------
3 Ni²⁺ + 2 Cr → 3 Ni + 2 Cr³⁺ (balanced reaction)
Therefore, in the balanced reaction a total of 6 electrons are transferred.
ri
1. Among these which is the example of compound?
a) sulphur
b) iron
c) ammonia
der
Answer:
Ammonia is a compound.
Explanation:
A compound is composed of two or more separate elements. Ammonia is NH3, which happens to be two different elements.
Which question can be answered by science A:which type of candy taste best B:which kind of backpack do students purchase most often C:why are children happy when they get home D:why should we help those less fortunate than us
Answer:B: Which type of backpack do students purchase most often
Explanation: The right answer is B. because its a question you can graph informational data about, unlike any other answer. Hope this helped!
~Emilie Greene
150.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How long will it take
to decay to 18.75g?
Given :
Initial mass , a = 150 gm .
Half time ,
[tex]t_{\dfrac{1}{2}}=36 \ hours[/tex].
Final mass , x = 18.75 gm .
To Find :
The time taken to decay 18.75 gm .
Solution :
We know , time taken is given by :
[tex]t=\dfrac{1}{k}\times ln(\dfrac{a}{a-x})[/tex]
Here , k is a constant given by :
[tex]k=\dfrac{0.693}{t_{\dfrac{1}{2}}}\\\\\\k=\dfrac{0.693}{36}[/tex]
Putting all given value in above equation :
We get :
[tex]t=\dfrac{36}{0.693}\times ln(\dfrac{150}{150-18.75})\\\\t=6.94\ hours[/tex]
Therefore , time taken is 6.94 hours .
Hence , this is the required solution .
f-orbital can accommodate maximum of... electron?
Explanation:
S= 2
P=6
D=10
F= 14
F orbital holds a maximum of 14 electrons
Answer:
14.
Explanation:
The f level consists of 7 orbitals and each can accommodate up to 2 electrons.
In which of the following sets do all species have the same number of electrons?
A) F-,Ne, Mg2+
B) Ge, Se2-, Br-
C) K+,Rb+, Cs+
D) Br, Br-, Br+
For the experiments from 1-3 with the same temperature change, what other parameters are the same at the initial reaction conditions?
a. mmol HCl total mL solution
b. mmol NaOH Initial concentration of NaOH
c. mL H2O Initial concentration of HCl
Answer:
The following parameters:
total mL solution mmol NaOH initial concentration of NaOHExplanation:
The options have been incorrectly arranged in the question statement given here. The three conditions mentioned above are what would be observed to remain the same when this experiment is carried out.
What does science mean to you
Answer:
Sample Essay On What Science Means to You. ... Entire knowledge acquired through science is about discovering truths, finding facts, uncovering phenomenon hidden by the nature. Observations and experimentation, in science, support in describing truth and realities through systematic processes and procedures.
Explanation:
Science is the pursuit and application of knowledge and understanding of the natural and social worlds according to systematic and evidence-based methodologies. Scientific methodologies include: Objective Observations: Measurements and Data (Math may be used as a tool, but not always)
What is the importance of science in our lives?Science plays an important role in our daily lives. It made our lives easier and more convenient. Science is just a systematic way of knowledge and life. The exploratory, careful and careful observation of changes in natural events by humans has produced science and scientific research.
Science plays an important role in our daily lives. It made our lives easier and more convenient. Science is nothing but a systematic way of knowledge and life. The exploratory, careful and careful observation of changes in natural events by humans has produced science and scientific research.
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What must you know to solve Keller’s third law the law of periods
A gold nugget has a mass of 24.41 G , What is the mass in ounces ? (1 oz =28.3459)
Answer:
24.41 grams=0.861 ounces
Explanation:
Since, 1 ounce = 28.3495 grams
We need to find the mass of 24.41 grams of a gold nugget.
We can say that, [tex]1\ \text{gram}=\dfrac{1}{28.3459}\ \text{ounces }[/tex] ....(1)
To find mass of 24.41 grams of a gold nugget multiply RHS of the equation 1 by 24.41.
So,
[tex]24.411\ \text{gram}=\dfrac{1}{28.3459}\times 24.41\ \text{ounces }\\\\=0.861\ \text{ounce}[/tex]
Therefore, 24.41 grams is equal to 0.861 ounces.