Answers
Answer:
The first one
Explanation:
Half-life (symbol t1⁄2) is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive.
Related Questions
7. Convert 3.57 x 106 into standard (long) form.
a) 0.0000357
b) 0.000357
c) 3570000
d) 0.00000357
e) 357000
!!!!! Need this now !!!
Answers
Answer:
c) 3570000
Explanation:
The standard form is a way to simplify too long or too short numbers. Standard form uses powers of ten to contract numbers.
x × 10^n
Where;
x = decimal number between 1.0 - 10.0
n = power of 10
According to this question, a number already in standard form is given as 3.57 x 10^6.
To convert to its long form, we count forward the power of ten beginning from where the decimal is. In this case, we're counting 6 times Note that once the decimal is after 7, we start placing zero (0) instead. Based on this, we have;
3.57 x 10^6
1st count = 35.7
2nd count = 357
3rd count = 3570
4th count = 35700
5th count = 357000
6th count = 3570000
Hence, the long form of the number 3.57 x 10^6 is 3570000.
what is pollination?
Answers
Hopefully that helped! Maybe just change up the words a bit <3
Limitations definition
Answers
Answer:
a limiting rule or circumstance; a restriction.
Example:
Also knowing her limitations, she'd declined the invitation to join them
Or a legally specified period beyond which an action may be defeated or a property right is not to continue.
Give an example of a metal and a nonmetal you use in everyday life.
Answers
Answer:
A type of metal I use everyday in life in using the iron door knob on my doors.
A nonmetal I use everyday is chlorine for when I need to clean my pool.
Explanation:
Is this your intention?
Chemical A breaks down into chemical B. At t=0, [A] = 0.100 M. At t=10.0 s, [A] = 0.075 M. What is
the average reaction rate?
Beach
Answers
Answer:
a0.075 i think so average number
To solve this we need to have knowledge of average reaction rate which relates the rate to the change in concentration to the change in time. The average rate of reaction is 0.0025.
What is rate law?A rate law represents the rate of a reaction . According to this rate is directly proportional to the concentration of reactants. There is another expression of rate law which is integrated rate law which is just opposite of differential rate law.
The average rate law for given reaction is given as:
Rate =Change in concentration÷ change in time
Change in concentration=Final concentration - initial concentration
= 0.075 M-0.100 M
=0.025
Change in time =10.0-0=10.0
substituting the values
Rate =0.025÷ 10.0
Rate =0.025÷ 10.0=0.0025
Therefore, the average rate of reaction is 0.0025.
To know more about rate law, here:
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3. If all of the predators in an ecosystem are killed off,
what happens to organisms that are their food source?
Answers
Answer:
its a little bit long but= The most obvious result of the removal of the top predators in an ecosystem is a population explosion in the prey species.More predators kill more prey, which, along with food scarcity, decreases the population. When prey becomes more scarce, the predator population declines until prey is again more abundant.
2Li+2H2O—>2LiOH+H2
Calculate the mass of reacted lithium when H2 is 6.02 * 10 ^ 23 molecules.
I really need the answer with all the calculation please.
Answers
Explanation:
Please find the Measures of Center and construct a histogram AND find the 5-number summary and construct a box-n-whisker plot for the numbers below.
Definition: This is a force which resists all motion.
Example: the lower panels on the space shuttle heat up due to this during re-entry through the
atmosphere
Answers
Answer:
The vocab word is Friction.
hope this helps :)
Explanation:
Research online to find out what the acidity of the rainfall is where you live. If you live in an area which is affected by acid rain, where do you think it is coming from and why?
Write 3-5 paragraphs describing the effects.
If you do not live an area effected by acid rain, choose another city that is effected by acid rain.
Answers
Answer & Explanation: Acid rain occurs when sulfur dioxide and nitrogen oxide are released into the air to create a chemical reaction. When the two mix in the air (oxygen), they will get into the water and mix with other pollutants in the air, making acid rain.
Answer:
What is acid rain? Acid rain occurs when sulfur dioxide and nitrogen oxide are released into the air to create a chemical reaction. When the two mix in the air (oxygen), they will get into the water and mix with other pollutants in the air, making acid rain.
What causes acid rain the most? It can be caused by useing nonrenewable resources. Which inclues coal, oil, ect.
What effects can acid rain have? It causes respiratory issues in animals and humans. When acid rain falls down and flows into the rivers and ponds it affects the aquatic ecosystem. It alters the chemical composition of the water, to a form which is actually harmful to the aquatic ecosystem to survive and causes water pollution which can harm our fresh water supply.
What is one service humans receive from the environment AND one-way humans disrupt ecosystems? (These need to be related!)
Answers
Answer:
Land-use change: Humans may destroy natural landscapes as they mine resources and urbanize areas. This is detrimental, as it displaces residing species, reducing available habitats and food sources. ... This can negatively effect an ecosystem because the introduced species may outcompete native organisms and displace them.
Explanation:
What happens to the amount of electrical energy when there are no clouds?
Answers
Answer:
It slows down
Explanation:
Question 21 of 25
Which of the following are elements in this equation:
2Mg(s) + O2 (9) ► 2Mgo (s)?
Check all that apply.
A. g
B. Mg
C. O
D. S
Answers
Answer: Mg and O
Explanation: just took the test. Trust
PLS HELP ON A TIMER!
if the pressure exerted by a sample of carbon dioxide at 25° C in a volume of 0.44L is 3.81 atm, what is the mass of the carbon dioxide?
A. .0685
B. 1.65
C. 3.02
D. 14.4
Answers
Answer:
3.02
Explanation:
A
region that has a specific
climate and a specific
community of plants and
animals
Answers
Answer: A biome is part of the biosphere. Biomes can influence each other. terrestrial biomes
Explanation:
Which formula can represent an alkyne? *
O
1. C2H4
O
2. C2H6
O
3. C3H4
O
4. C3H6
Answers
the answer is (3). C3H4
Explanation :
C3H4 is propyne.
The formula that can represent an alkyne is 3. C3H4.
What are alkynes?Alkylnes are organic compound and unsaturated hydrocarbons which is formed by carbon-carbon triple bond.
The triple bonds that are fromed between carbon are one alpha and two sigma bonds.
Thus, the correct option is 3. C3H4
Learn more about alkynes
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Calculate the mass of the salt that can be produced from 10.0 g of magnesium chloride reacting with sulfuric acid. Include the percent yield of the salt if 11.5 g was actually produced.
Answers
Answer:
theoretical yield is 12.6f
91.3%
Explanation:
11.5 ÷ 12.6 = 91.3
A gas occupies a volume of 10 liters at a pressure of 0.5 atm. What is the pressure if the volume increases to 25.0 L? *
A.0.4 atm
B.0.3 atm
C.0.2 atm
D.0.1 atm
Answers
Answer:
0.2atm
Explanation:
By Boyle's law
P1V1=P2V2
0.5 x 10 = P2 x 25
therefore, P2= 0.2atm
How many moles of nitrogen are in 12 grams
Answers
Answer:
Explanation:
The chemical formula of nitrogen is N2
A mol of Nitrogen atoms = 14 grams
So N2 will have a molar mass of 14 * 2 = 28 grams
number of moles of N2 = given mass / molar mass
number of moles of N2 = 12 / 28
number of moles of N2 = 0.4286 mols
When you pour 125 grams of solute into 1.25 Liters of 35 grams of crystal sink to the bottom and do not dissolve. What is the saturation point in terms of grams per liter?
Answers
Answer:
72 g/L
Explanation:
The dissolved amount of solute is the difference between the amount you have poured and the amount that precipitated:
125 g - 35 g = 90 g
Thus, 90 grams of solute were dissolved in 1.25 liters. The saturation point is the ratio between the grams dissolved and the volume in liters:
saturation point = 90 g/1.25 L = 72 g/L
What is a galvanic cell made of
Answers
Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.
Which phase change is not associated with gases?
Answers
Answer: depositing
Explanation:
What is the total pressure of a gas mixture containing partial pressures of
0.23 atm, 0.42 atm, and 0.89 atm?
A. 1.54 atm
B. 0.89 atm
C. 0.42 atm
D. 0.51 atm
SUBM
Answers
Answer:
1.54 atm
Explanation:
By Dalton's Law Of partial pressure,
Total Pressure = Sum of all partial pressures
So,P= P1 + P2 + P3
Therefore, P=0.23+0.42+0.89
=1.54 atm
eeeeeeeeeeeeeeeeeeeeeeeeeeeee
Answers
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
Have a nice day!
Answer:
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
give the other person brainliest
have a good day :)
Explanation:
Name the following alkane molecule:
CH3CH(CH3)CH2CH(CH3)2
A. heptane
B. 2,4,4-trimethylbutane
C. 2,4-dimethylpentane
Answers
Answer:
B
Explanation:
Just by looking at the amount of carbons on the straight chain which is four and whom prefix is butane we can see that B is the answers
Why is it that when you heat up a small portion of mac n cheese, it gets warmed up quickly and soon burnt. I heated up my bowl because it was getting cold, only a little in it and it got started poping after 1 second. Why is this?
another fun question, but for real, what does it mean?
Answers
Answer:
well tbh it's just the microwave doing its job heating up your Mac n cheese. But while doing so the Mac n cheese absorbs a lot of heat and then releases it by popping.
Answer:
I don't know
Explanation:
so true though
Help please help me!!!!!
Answers
Answer:
B. 460 NM
Explanation:
THAT THE ANSWER
Help meee!! this is really confusing my brain
Answers
Answer:
I believe it's (3)
Explanation:
same number of proton and electrons in both atoms A and atom B. but different number of neutron
1
How are reflecting telescopes different from refracting
telescopes?
A
Reflecting telescopes need light sources; refracting
telescopes don't
B ;
Reflecting telescopes magnify objects; refracting
telescopes minimize them
C Reflecting telescopes magnify
objects in outer
space;
D Reflecting telescopes use mirrors to collect light;
Answers
Answer:
b.
Reflecting telescopes use mirrors to collect light; refracting telescopes use lenses
Explanation:
Which of the following would be the best caption for this image?
A
The Coriolis effect causes convection cells of air to circulate through the atmosphere.
B
The pattern of ocean currents is identical to the pattern of wind currents.
C
Uneven heating of land and water causes winds to blow in different directions during the daytime and night time.
D
There are six bands of global wind currents. These bands of wind currents are caused by convection cells created by the warming and cooling of air.
Answers
What are the two limitations of earth plates
Answers
Answer:
The tectonic style and viability of modern plate tectonics in the early Earth is still debated. Field observations and theoretical arguments both in favor and against the uniformitarian view of plate tectonics back until the Archean continue to accumulate. Here, we present the first numerical modeling results that address for a hotter Earth the viability of subduction, one of the main requirements for plate tectonics. A hotter mantle has mainly two effects: 1) viscosity is lower, and 2) more melt is produced, which in a plate tectonic setting will lead to a thicker oceanic crust and harzburgite layer. Although compositional buoyancy resulting from these thick crust and harzburgite might be a serious limitation for subduction initiation, our modeling results show that eclogitization significantly relaxes this limitation for a developed, ongoing subduction process. Furthermore, the lower viscosity leads to more frequent slab breakoff, and sometimes to crustal separation from the mantle lithosphere. Unlike earlier propositions, not compositional buoyancy considerations, but this lithospheric weakness could be the principle limitation to the viability of plate tectonics in a hotter Earth. These results suggest a new explanation for the absence of ultrahigh-pressure metamorphism (UHPM) and blueschists in most of the Precambrian: early slabs were not too buoyant, but too weak to provide a mechanism for UHPM and exhumation.
Explanation:
