Answer:
i only found the 49, hope it still helps, mate
49. In this question (t½) of C-14 is 5730 years, which means that after 5730 years half of the sample would have decayed and half would be left as it is.
After 5730 years ( first half life) 70 /2 = 35 mg decays and 35 g remains left.
After another 5730 years ( two half lives or 11460 years) 35 /2 = 17.5mg decays and 17.5 g remains left .
After another 5730 years ( three half lives or 17190 years) 17.5 /2 = 8.75mg decays and 8.75g remains left.
after three half lives or 17190 years, 8.75 g of C-14 will be left.
6.0x10^26 molecules of sodium hydroxide
Answer:
6E26
Explanation:
How many elements are in (NH4)3PO4
Answer:
4
Explanation:
There are 4 different elements in the compound (N, H, P, O) but if you want to count the number of each element then the answer is different.
In NH4, theres 1 N and 4 H, but since there are 3 NH4s then u have 3 N and 12 H. There's 1 P and 4 Os as well.
Added together u have 3 + 12 + 1 + 4 = 20 elements in total.
hope this helps!
___________ mL = 2.2 L
Answer:
2,200 mL I believe it is.
Answer:
2,200 is the answer of your question
Hold the slides for observation
Describe the natural processes which remove carbon dioxide from the atmosphere
Answer:
Explanation:
The process is photosynthesis as plants need carbon dioxide and humans need oxygen so plants release oxygen which humans breath/take in and plant/trees take in carbon dioxide which humans release.
The natural process which removes carbon dioxide from the atmosphere is photosynthesis.
What is photosynthesis?
It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy through the process of cellular respiration.
Some of the energy which is converted is stored in molecules of carbohydrates like sugar and starches which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.
The process begins with proteins absorbing light energy which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.
Learn more about photosynthesis,here:
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Bubbles are released when nitric acid is added to a potassium carbonate solution.
What is the net ion
How are seasons different North & South of the equator
Answer:
seasons experienced by the northern and southern hemisphere always differ by six months when it is summer in the northern hemisphere, it is winter in the southern hemisphere
Explanation:
Answer:
ohhhhhhh she -he was having a point
Help ASAP!!!!10 Points
The sun’s mass is about 30 million times greater than the moon. Why does the gravitational pull between Earth and the moon affect Earth’s tides more than the gravitational pull between Earth and the sun?
a The moon is denser than the sun.
b The moon is closer to Earth than the sun.
c The moon has phases, but the sun does not.
d The moon orbits Earth, but the sun does not.
Answer:
B
Explanation:
stronger gravitational gradient
temperature is defined as the average kinetic energy of the molecules. what is the temperature reading when all molecules completely stop vibrating?
A.0 degrees F
B. 0 degrees C
C.0 degrees K
D.273 degrees K
Answer:
Temperature is the average kinetic energy of the molecules. Absolute zero is the temperature where molecular motion stops and is the lowest possible temperature. ... The relationship between Celsius and Kelvin temperature scales is given by K = °C + 273.15.5
so the answer is B
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What is the molar mass of methane (CHA)?
A. 16.05
grams
O B. 13.02 grams
O C. 49.05 grams
O D. 10 grams
When does only the vertical component of light pass through a Polarizer?
Calcium is a metal.
Word equations for two reactions of calcium are shown.
calcium + oxygen
→ calcium oxide
calcium + hydrochloric acid → calcium chloride + hydrogen
The equation for the reaction of dilute hydrochloric acid with calcium is
Ca + 2HCl → CaCl2 + H2
Calculate the maximum mass of calcium chloride produced by reacting 8.02 grams of
calcium with excess hydrochloric acid.
relative atomic mass: Ca = 40.1
relative formula mass: CaCl2 = 111.1
Show your working.
Answer:
22.22 g
Explanation:
The balanced reaction equation is;
Ca(s) + 2HCl(aq) → CaCl2(aq) + H2(g)
Number of moles of calcium reacted = 8.02g/40.1g/mol = 0.2 moles of Calcium
From the reaction equation;
1 mole of Ca yields 1 mole of CaCl2
Hence 0.2 moles of Ca also yields 0.2 moles of CaCl2
Mass of calcium chloride produced = number of moles * molar mass
Mass of calcium chloride = 0.2 moles of CaCl2 * 111.1g/mol = 22.22 g
What is a responding variable
Answer:
A manipulated variable is also called an independent variable. A responding variable is a variable that the researcher predicts will change if the manipulated variable changes. A responding variable is also called a dependent variable.
Match the special cases of each gas law with its description. A law may be used more than once. In the equations, K is a constant.
A. Boyle's law
B. Charles's law
C. Avogadro's law
D. Dalton's law
____ P1 V1 = P2 V2
____ V/T = k
____ V1 / T1 = V2 / T2
____ V = kn
____ PV = k
____ Ptotal = P1 + P2 + P3 + .
The special cases of gas laws and its description includes:
A. Boyle's law: P1 V1 = P2 V2
B. Charles's law: V/T = k or V1 / T1 = V2 / T2
C. Avogadro's law: V = kn
D. Dalton's law: Ptotal = P1 + P2 + P3 + .
What is gas law?Gas laws are laws that relate a gas's pressure, volume, and temperature. Boyle's law, named after Robert Boyle, states that the pressure P of a gas varies inversely with its volume V at constant temperature, or PV = k, where k is a constant. Charles' law is named after J. -A. -C.
They also include; Gay-Lussac's Law, Avogadro's Law and Dalton's law of partial pressures.
Learn more on gas laws here: https://brainly.com/question/25290815
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What causes warm air to rise?
a. The fact that it's less dense than cold air.
b. The fact that it weighs more than cold air.
c. The fact that it has higher pressure than cold air.
d. The fact that it's more dense than cold air.
In the tropical rainforests, birds have evolved to eat the brightly-colored fruits. The fruits have evolved their attractive color so the birds will eat them and spread their seed. What theory is this an example of? A artificial selection b coevolution c mutation d natural selection
Answer:
coevolution
Explanation:
Coevolution plays a key role in shaping the biodiversity on Earth. Coevolution is commonly defined as reciprocal evolutionary changes brought about by interactions between species, implying that interacting species impose selection on each other(Science direct).
We can see that the change that occurred in the plants of the tropical rainforests is closely related to their link to birds. The fruits evolved an attractive color so that birds, having evolved to eat the brightly-colored fruits, may eat them.
1Kr + 3 F2 → 1KrF6
2. How many moles of fluorine are required to
produce 3.0 grams of KrFo?
Answer: 0.045 moles of [tex]F_2[/tex] will be required to produce 3.0 grams of [tex]KrF_6[/tex].
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} KrF_6=\frac{3.0g}{198g/mol}=0.015moles[/tex]
The balanced chemical equation is:
[tex]Kr+3F_2\rightarrow KrF_6[/tex]
According to stoichiometry :
1 mole of [tex]KrF_6[/tex] is produced by = 3 moles of [tex]F_2[/tex]
Thus 0.015 moles of [tex]KrF_6[/tex] will be produced by=[tex]\frac{3}{1}\times 0.015=0.045moles[/tex] of [tex]F_2[/tex]
Thus 0.045 moles of [tex]F_2[/tex] will be required to produce 3.0 grams of [tex]KrF_6[/tex].
Please help!! I'll name you brainliest!!
Answer:
lost is the answer to this question but if I am wrong I am so sorry for that
What mass of Na2CO3 is required to create 750 mL of an aqueous solution where the concentration of the carbonate (CO3-2) ions is 1.75 M? (assume complete dissociation)
Answer:
139.11 grams
Explanation:
The molarity (M) is equal to m (moles) /L (liters).
Notice how it is in mL so converting it would be 0.75 L (750*10-3)
Now plug in the information
1.75=m/0.75
m=1.3125
Now m is in moles so convert to grams to get the mass
1.3125 mol Na2CO3 * 105.9888 g Na2CO3 = 139.1103
CO2 + H2O --> C2H2 + O2
Answer:
C2H2 + 5 O2 = 4 CO2 + 2 H2O
Add / Edited: 27.09.2014 / 25.01.2015
Evaluation of information: 5.0 out of 5 / number of votes: 2
Source: https://chemiday.com/en/reaction/3-1-0-339
Explanation:
tot Which of the following is not a property of water?
O A. ability to moderate temperatures
O B. ability to adhere to other substances
O c. ability to contract upon freezing
O D. ability to dissolve a wide variety of substances
In the ATP cycle, a phosphate group is cut off of
A. ATP to form ADP, absorbing energy.
B. ATP to form ADP, releasing energy.
C. ADP to form ATP, absorbing energy.
D. ADP to form ATP, releasing energy.
Answer:
B) ATP to form ADP, releasing energy.
Explain how airbag gets deployed ? Explain the reactions involved?
Answer:
Let’s get back to simple physics and the laws of motion. Your car and everything in it are traveling in a given direction, to stop in requires force be applied in the opposite direction over a period of time. This occurs extremely quickly in an accident and the force is greater because the time the opposing force is acting on the vehicle is very short. The airbag system is designed to offer you protection from the violent forces exerted on you during an accident.
There are three main components to your airbag system, the bag, the inflator and the sensor. The sensor must register a collision force roughly equal to hitting a brick wall at 10 to 15 mile per hour before it will trigger the airbag inflation. Once tripped the airbag system inflates through a chemical reaction between sodium azide (NaN3) and potassium nitrate (KNO3) which creates nitrogen gas. An igniter is set off which quickly burns the chemical fuel and creates the gas needed for expansion. The bag then blows out of its storage in a split-second. Immediately after inflation, when the chemical burn is complete, the airbag begins to deflate as the gasses escape from holes in the fabric.
Explanation:
When using pH paper, the pH of a solution can be determined by looking at the _______ of the paper.
how many miles will a person run an 800 km race?
Answer:
uhh its 497 miles
Explanation:
Which substance is the least toxic?
a. chlorine (LD50 = 850 mg/kg)
b. vitamin A (LD50 = 2000 mg/kg)
c. cola (LD50 = 140 mg/kg)
d. aspirin (LD50 = 200 mg/kg)
Answer:
I believe it's D. I searched up a lethal table chart and it states Aspirin is even more toxic than chlorine. As for the other two, it didn't specifically state it was toxic with one dose - meaning you have to take more than one dose for toxicity to take effect.
Explanation:
Suppose you weigh the unknown substance on an electronic balance and find it has a mass of 445 grams. Analyzing the products of decomposition, you find that the masses of the elements in the sample are 232 grams of carbon, 58 grams of hydrogen, and 155 grams of oxygen. Finally, through further experimentation, you determine that the molar mass of the compound is 46.07 grams/mole.
Calculate the amount, in moles, of each component element in your substance. Use the periodic table to help you find the necessary molar masses.
____ moles of carbon
____ moles of hydrogen
____ moles of oxygen
Answer:
19.32 = moles of carbon
57.54 = moles of hydrogen
9.69 = moles of oxygen
Explanation:
232 g carbon × 1 mol C / 12.011 g C= 19.32 mol C
58 g hydrogen × 1 mol H / 1.008 g H = 57.54 mol H
155 g oxygen × 1 mol O / 15.999 g O = 9.69 mol O
The empirical formula of a compound is CH. Its molecular mass is 70.14 g.
What is the factor? |
What is its molecular formula? (Write your formula without any space A2B3)
Whats the correct answer ?
NEED HELP ASAP!!!
Please choose correctly!!
Will mark brainliest thank you!!!