If a radioactive sample starts with 100 g, how many grams of the original substance will be left after 5 half-lives? Please show all work.
Answer:
3.125g
Explanation:
100/2
50 1
50/2
25 2
25/2
12.5 3
12.5/2
6.25 4
6.25/2
3.125g 5
What is the general form for the simplest type of acid-base reaction? A. Acid + base → H+ + OH-
B. Acid + base → base + acid
C. Acid + base → salt + water
D. Acid + base → solid + water
Answer:
C
Explanation:
Adding and acid and base together until it is completely neutralized will give us water and a salt.
For example:
HCl + NaOH --> NaCl + H2O
HCl being the acid
NaOH being the base
The H2O is water
The NaCl is the salt
express 3.81 meters in inches
Answer:
150 inches.Explanation:
3.81 m. = 150 inches.
I can't find explanation. Hope this is my best!
Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
Answer:
Explanation:
Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
A sample of gas starts at 1.00 atm, 0.00 degrees Celsius, and 30.0 mL. What is the
volume if the temperature increases to 27.0 degrees Celsius and the pressure increases to
2 atm?
Answer:
pV= nRT
Explanation:
(p1 × V1)/ T1/ (p2 × V2)/ T2
Which of the following is true about processes that shape the Earth?
Some processes that shape the Earth are happening so slowly they cannot be easily detected in a human's lifetime.
What is the Earth?This is the third planet from the Sun and is characterized by its plants and animal life.
This planet have some processes which occur slowly and aren't easily detected unlike the rapid ones.
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what is the chemical formulae for lime water
Answer:
The formula for lime water is Ca(OH)2 and the chemical name for lime water is calcium hydroxide.Explanation:
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[tex]\\ \purple{MaggieEve}[/tex]
Gregory is doing his experiment for the science
fair. The above table shows the data he collected.
Based on the table, what is the best description of
what Gregory wanted to know?
A) Which brand
and amount of fertilizer will work best?
B) Which
brand of fertilizer (A,B or C) works the best?
C)
Which amount of fertilizer will show the most
growth?
D) What level of fertilizer is the most that
can be given before growth decline?
Answer:
A) Which brand and amount of fertilizer will work best?
Explanation:
A) is the best answer because it takes into account all of the variables. The variables seem to be the amount of fertilizer, average plant growth, and brand of fertilizer. The independent variables are amount of fertilizer and fertilizer brand. The dependent variable is the plant growth.
B) is not the best answer because it does not include the amount of fertilizer. Because this variable is changing, it is important to consider.
C) is not the best answer because it does not take the type of fertilizer into account. If the researcher were only concerned with how the amount of fertilizer affects plant growth, it would not be necessary to include 3 different types of fertilizer.
D) is not the best answer because this doesn't explain why the researcher used different types of fertilizer.
the non-contact forces portfolio please help I'm just confused about what I'm supposed to do.
The non-contact forces portfolio includes Gravitational force, Magnetic force and Electrostatic force.
What is non contact force?Non contact forces are those forces which are applied on any object without any physical interference or contact.
Some non-contact forces are:
Gravitational force: It acts between two objects and depends on the masses of the object and distance between that objects.Magnetic force: It acts due to the motion of the charged particles.Electrostatic force: It is a type of induced force which is generated due to rubbing of two objects but when it is generated it remains even after removing the contact of previous objects.Hence Gravitational force, Magnetic force and Electrostatic force are the non-contact forces.
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Select the correct answer. which characteristic is a property of water? a. densest as a solid b. low surface tension c. nonpolar molecules d. strong cohesion e. weak adhesion
The statement that is a characteristic of water is strong cohesion. Details about characteristics of water can be found below.
What are the characteristics of water?Water is a unique molecule which is attributed to its unique characteristics or features.
Water is made up of two hydrogen atoms and one oxygen atom that are chemically bonded to one another.
Some of the characteristics of water are as follows:
Water is a very polar moleculeWater is a universal solventWater has high surface tensionWater has high specific heat capacityWater is less dense as a solid than as a liquidWater has strong cohesive and adhesive propertiesWater has high boiling and freezing pointsTherefore, the statement that is a characteristic of water is strong cohesion.
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acrostic poem for selective breeding
Answer:
Selective Breeding
Weeds are bad,
But why is this so?
Just like grass,
They too grow.
Weeds are disliked,
Like the drink that's spiked.
But why is this so?
Who's to say they shouldn't grow?
The weed is unwanted,
Like a murderer hunted.
But what crime did it commit?
Why should it not, be free to sit?
Thickly they may grow,
But grass even more so.
Who's to say they should not grow?
Why should their seed not be sow?
Weeds are bad,
But why is this so?
Just like grass,
They too grow.
If all things living, were for cared,
The land we own, for all shared.
The weed let live,
And life not carefully selected by- siv.
Selective breeding is unfair,
No better than plain warfare...
Explanation:
How is the delta H fusion used to calculate the energy released when a volume of liquid freezes
The ΔH fusion used to calculate the energy released when a mass of liquid freezes by using the formula Grams liquid x mol/g x ΔH fusion.
What is enthalpy?The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
Heat of formation or enthalpy is given for any one mole of substance.
And it will be calculated for moles of gases as, so for this first mass will be converted into moles as-
n = W/M, where
W = given mass in grams
M = molar mass in g/mol
and then multiply the given moles by the enthalpy of formation of one mole.
Hence, Grams liquid x mol/g x ΔH fusion is used.
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Answer:
ANSWER
Explanation:
Select the correct answer from the drop-down menu. of all the sunny club members in a particular city, 25% prefer swimming on weekends and 75% prefer swimming on weekdays. it is found that 10% of the members in that city prefer swimming on weekends and are female, while 55% of the members in that city prefer swimming on weekdays and are female. the probability that a club member picked randomly is female, given that the person prefers swimming on weekends, is .
Based on the percentage of people that prefer to swim on weekends, the probability that a female who prefers swimming on weekends is picked is 0.40.
What is the probability of a female weekend swimmer being randomly picked?This can be found by the formula:
= Percentage of females who prefer swimming on weekends / Percentage of those who swim on weekends
Solving gives:
= 10% / 25%
= 0.40 or 40%
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Please help me on this question
What is the molarity of a solution that contains 25 g of hcl in 150 ml of solution? (the molar mass of hcl is 36.46 g/mol.) what should you find first?
Answer: 4.6 M
Explanation:
Converting 25 g of HCl to moles, we get 25/36.46 = 0.68568294020845 moles.
Also, 150 mL = 0.150 L
So, the concentration is:
[tex]\frac{0.68568294020845}{0.150} =\boxed{4.6 \text{ M}}[/tex]
Answer:
Part 1. First, you find the Moles.
Part 2. The correct setup for finding the moles is: 25g HCI x 1mol HCI/36.46g HCI
Part 3. The correct setup to find liters is: 150 mL x 1L/1000mL
Part 4. The molarity of this solution is: 4.6 M HCI
Explanation:
just listen lol
if it has a high temp but a low pressure does it dissolve faster than a high pressure and a low temperature
Answer:
it dissolve faster in higher temperature hope it's right
Convert these temperatures to Celsius:
a. 303 K
d. 45 K
303K − 273.15 = 29.85°C
45K − 273.15 = -228.1°C
Please answer my questions. I really need them soon. I will post the links for other questions in the comments.
Explanation:
option option B is the correct answer of given statement helium-4(He)=2
Evaluate what advantage Bronsted-Lowry base theory has over the Arrhenius base theory.
A) The Bronsted-Lowry bases can act as proton acceptors.
B) Bronsted-Lowry bases act as hydroxide ion acceptors.
C) Both hydroxide and hydronium ions are released as Bronsted-Lowry bases.
D) Hydroxide ions are the only Bronsted-Lowry bases produced in solution.
The advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.
What are Bronsted-Lowry bases?According to the definition of Bronsted-Lowry, a base is a proton acceptor. In that case, the concept of bases is not limited to only the hydroxide ions.
Thus the advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.
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Which change does thermal energy cause? *
O greater energy differences between molecules
O slower molecule movement
O reduced energy transfer
more collisions between molecules
a woman put her clothes in the dryer.There is a mix of wool and cotton. After the dryer is finished wool clothes and cotton clothes are stuck together. There's no wool stuck to wool or cotton stuck to cotton.using laws of charge, explain why this is the case
Answer:
Explanation:
Explanation
There is a Plus charge on one of them (I think it is likely the wool).
There is a minus charge on the other one (So it is cotton most likely.
The point is that like charges repel (move away from each other)
Unlike charges attract. (move close to each other.)
You have a case of unlike charges attracting.
Green plants are primary consumers. True False
Answer:
The answer is False beacuse, plant are called producers because they make their own food.
Fe2O3 (s) + 3CO (g) -----> 2Fe (l) + 3CO2 (g)
How many moles of Fe2O3 must react to produce 760 kg of Fe? (please tell me how you get the answer...)
The number of moles of Fe₂O₃ that must react to produce 760 kg of Fe are 20.503
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The reaction is [tex]\rm Fe_2O_3 (s) + 3CO (g) ----- > 2Fe (l) + 3CO_2[/tex]
The mass of Fe is given 760 kg
The molar mass of Fe is 55.9 g/mol
To calculate the number of moles
[tex]n = \dfrac{m}{M} \\\\n = \dfrac{760000}{55.9 g/mol} = 13,669[/tex]
Now, the ratio between Fe and O is 2 : 3
[tex]\dfrac{13,669}{2} \times 3 = 20,503.5[/tex]
convert it into kg = 20.503 mol
Thus, the moles are 20.503 mol
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the number of nucleons of an isotope represents the total number of..
Answer:
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.
If the ant-lion (predator) population becomes larger than the ant (prey) population what do you think would happen to the population of the ant-lion?
Answer:
It would decrease.
Explanation:
This is because there is not enough food (ant) for the ant-lion group.
Scientists hypothesize that Earth's first oceans were made of fresh water. How did oceans obtain fresh water?
*
1 point
Water vapor in the early atmosphere cooled and fell to Earth as rain.
Frozen comets that fell to Earth melted as they traveled through the atmosphere.
As soon as icecaps formed, they melted because Earth was still very hot.
Early terrestrial organisms exhaled water vapor, which condensed to form fresh water.
The earth's first oceans would have obtained freshwater as a result of the condensation of water vapor in the atmosphere back then.
How were oceans formed?The freshwater of oceans was hypothesized to have been formed by the condensation of water vapor present in the early atmosphere of the earth.
The water vapor was thought to have emanated from volcanic activities. The condensation was in the form of rain and the resulting puddles merged together to form the oceans.
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Proteins are synthesized in which organelle?
Question Options:
A: nucleus
B: ribosomes
C: mitochondria
D: chloroplasts
Protein are synthesized by ribosome. The correct option is B, ribosome.
What is ribosome?Ribosomes are small spherical organs that are present in the cytoplasm. They are the main site of protein synthesis.
They consist of RNA and associated protein. They link amino acid together by the order of codons given by messenger RNA.
Thus, the correct option is B: ribosomes.
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Balanced chemical equation for the combustion of biodiesel
The balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.
What is combustion reactions?Combustion reaction is the reaction in which a substance react with oxygen to produce energy and heat. It is an exothermic reaction.
The combustion of biodiesel with oxygen form carbon dioxide and water.
Thus, the balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.
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PLEASE HELP ASAP!!!!WILL MARK BRAINLEST
If 50.0 grams of HCl were dissolved in enough water to make a solution with a total volume of 5.0 liters, what would be the molarity of the solution?
Determine moles of solute:
Calculate molarity:
Answer:
If 50.0 grams of HCl were dissolved in enough water to make a solution with a total volume of 5.0 liters, then the molarity of the solution is 0.282M.
How do we calculate molarity?
Molarity of any solution will be calculated by using the below equation:
M = n/V, where
n = moles of solute
V = volume of solvent in L
Moles will be calculated by using the below equation:
n = W/M, where
W = given mass = 50g
M = molar mass = 35.45 g/mol
n = 50/35.45 = 1.41 moles
On putting values in the above equation, we get
M = 1.41mol / 5L = 0.282M
Hence required molarity of solution is 0.282 M.
Explanation:
How does the number of reactants in a double-displacement reaction
compare with the number of products?