Answer:
d
Explanation:
The half-life of a strontium isotope is 25 years. How much of this particular isotope will remain after 100 years if the starting mass is 16 grams?
Answer:
1 gram
Explanation:
Half life = 25 years
Starting mass = 16 grams
Time = 100 years
Number of half lives = Time / Duration of Half life = 100 / 25 = 4
After first Half life;
Remaining mass = 16 / 2 = 8 g
After Second Half life;
Remaining mass = 8 / 2 = 4 g
After Third Half life;
Remaining mass = 4 / 2 = 2 g
After Fourth Half life;
Remaining mass = 2 / 2 = 1 g
The image shows sedimentary rock layers with index fossils and a fault.
Which statement accurately describes the rock layers?
Layer 8 is older than layer 1.
Layer 3 is younger than layer 6.
Layer 4 and layer 10 are the same relative age.
Layer 2 and layer 9 are the same relative age.
Answer:
Layer 2 and layer 9 is the same relative age since it is the same type of rock and has the same fossils.
Hope this helped!
Which is the best example of plant tissue?
A:
B:
C:
D:
(Please look at the pictures to answer if its wrong I may have a chance to fail please be nice and help)
Explanation:
all are a good example of plant tissue but from my side I think it is B.
your well-wisher
How many cubic centimeters are in the block? if the length is 1, the width is 1 and the height is 1?
Answer:
Volume = [tex]1cm^3[/tex]
Explanation:
Volume of cube = [tex]s^{3}[/tex]
Wherein,
s = length of side
Hence,
If the length of each side is 1cm,
Volume = [tex]1^3[/tex]
= 1[tex]cm^3[/tex]
Put each equation under the correct heading.
Select the most likely product for this reaction:
Upper A g upper N upper O subscript 3 (a q) plus upper N a upper O upper H (a q) right arrow question mark.
AgOH(s) + NaNO3(aq)
Ag2O(s) + HNO3(aq)
Ag(s) + H2(g) + O2(g)
Answer:
(A) AgOH(s) + NaNO3(aq)
Explanation:
correct on edge 2021
Answer:
a
Explanation:
Fluorine gas reacts with aqueous iron (II) iodine to produce iron (II) fluoride and iodine liquid What is the balanced chemical equation for this reaction?
Answer:
F₂ (g) + FeI₂ (aq) → FeF₂ (aq) + I₂ (l)
Explanation:
Our reactants are:
F₂ → Fluorine gas, a dyatomic molecule
FeI₂ → Iron (II) iodine
Our products are:
I₂ → Iodine
FeF₂ → Iron (II) fluoride
Then, the reaction is:
F₂ (g) + FeI₂ (aq) → FeF₂ (aq) + I₂ (l)
We see it is completely balanced.
Pleaseeee help me
balance the following formula equation Al(s) + CuCl2 (aq) = AICI3 (aq) + Cu(s) Coloress
Answer:
[tex]2Al (s) + 3CuCl2( aq) --> 2AlCl3 (aq) + 3Cu(s)[/tex]
Explanation:
The main thing for this equation is to follow the amount on each side. Count each element on each side. Then by looking at the numbers figure out what numerical digit would make them equal.
For example:
On the left we have
Cu=1 and Cl=2.
But on the right we have
Cu=1 and Cl=3.
In order for them to be the same, we must add a coefficient of 3 to CuCl2 (aq0 on the left and a coefficient of 3 to Cu(s) on the right.
How much of the world’s drinking water is provided by rivers?
A. 50%
B. 75%
C.90%
D. None of these
(Be accurate & will give brainliest if the answer is correct when I get the quiz results back.)
Calculate the heat absorbed when 68.8 g of ice at -30.0 c is converted to steam at 160 c
Answer: 219 kJ
Explanation:
Help! Need it ASAP!
Is steam and vapour different? If they are then how are they different?
Answer:
Explanation:
Water vapor is when water molecules are present in the air, while steam is water heated to the point that it turns into gas. In simplified science, both are referred to as the gaseous state of water. Steam is usually white or translucent in nature, while water vapor can be clear or translucent.
Steam is simply, water vapor. Hence, the key difference between steam and vapor is that steam is the gaseous state of water whereas vapor is the gaseous state of any substance. Moreover, steam is typically invisible while the vapor of some substances is colorful.
What is the empirical formula of a compound that is 7.74% H and 92.26% C? What is the molecular formula if the molar mass is 78.1134 g/mol?
What is the empirical formula of a compound that is 8.68% O, 6.56% H, and 84.75% C? What is the molecular formula if the molar mass is 184.2372 g/mol?
What is the empirical formula of a compound that is 90.51% C and 9.49% H? What is the molecular formula if the molar mass is 106.167 g/mol?
What is the empirical formula and molecular formula for a substance that is 39.72% C, 1.67% H, and 58.61% Cl if the molar mass of the substance is 181.44 g/mol?
What is the empirical formula of a compound that is 47% Pt, 18.84% K, and 34.16% Cl? What is the molecular formula if the molar mass is 415.098 g/mol?
What is the empirical formula of a compound that is 6.35% H, 55.83% Cl, and 37.83% C? What is the molecular formula if the molar mass is 127.0132 g/mol?
Answer:
For all these questions, we want to find the empirical and molecular formulae of various compounds given their percent composition and molar mass. The technique used to answer one of the questions can accordingly be applied to all of them.
Approaching the first question, we treat the percentages of each element as the mass of that element in a 100 g compound (as the percentages add up to 100%). So, our 100 g compound comprises 7.74 g H and 92.26 g C.
Next, we convert these mass quantities into moles. Divide the mass of each element by its molar mass:
7.74 g H/1.00794 g/mol = 7.679 mol H
92.26 g C/12.0107 g/mol = 7.681 mol C.
Then, we look for the molar quantity that's the smallest ("smaller," in this case, since there are only two), and we divide all the molar quantities by the smallest one. Here, it's a very close call, but the number of moles of H is slightly smaller than that of C. So, we divide each molar quantity by the number of moles of H:
7.679 mol H/7.679 mol H = 1
7.681 mol C/7.679 mol H ≈ 1 C/H (the value is actually slightly larger than 1, but we can treat it as 1 for our purposes).
The quotients we calculated represent the subscripts of our compound's empirical formula, which should provide the most simplified whole number ratio of the elements. So the empirical formula of our compound is C₁H₁, or just CH.
Here, it just so happens that we obtained whole number quotients. If we end up with a quotient that isn't a whole number (e.g., 1.5), we would multiply all the quotients by a common number that would give us the most simplified whole number ratio (so, if we had gotten 1 and 1.5, we'd multiply both by 2, and the empirical formula would have subscripts 2 and 3).
To find the molecular formula (the actual formula of our compound), we use the molar mass of the compound, 78.1134 g/mol. The molar mass of our "empirical compound," CH, is 13.0186 g/mol. Since our empirical formula represents the most simplified molar ratio of the elements, the molar masses of our "empirical compound" and the actual compound should be multiples of one another. We divide 78.1134 g/mol by 13.0176 g/mol and obtain 6. The subscripts in our molecular formula are equal to the subscripts in our empirical formula multiplied by 6.
Thus, our molecular formula is C₆H₆.
---
As mentioned before, all the questions here can be answered following the procedure used to answer the first question above. In any case, I've provided the empirical and molecular formulae for the remaining questions below for your reference.
2. Empirical formula: C₁₃H₁₂O; molecular formula: C₁₃H₁₂O
3. Empirical formula: CH; molecular formula: C₈H₈
4. Empirical formula: C₂HCl; molecular formula: C₆H₃Cl₃
5. Empirical formula: Cl₄K₂Pt; molecular formula: Cl₄K₂Pt
6. Empirical formula: C₂H₄Cl; molecular formula: C₄H₈Cl₂
Which term describes all the different populations within one area?
WILL GIVE BRAINLY!!
Answer:
a biotic factor это просто
How might the structure of an atom be modeled
Answer:
you can explore the structure of atoms as you add protons, neutrons, or electrons to a model and the name of the element you have created
Explanation:
Which of the following is an oxidation-reduction reaction?
ZnS(s) + 2O2(g) Right arrow. ZnSO4(s)
CaO(s) + H2O(l) Right arrow. Ca(OH)2(s)
6Li2O(s) + P4O10(g) Right arrow. 4Li3PO4(s)
SO2(g) + H2O(l) Right arrow. H2SO3(aq)
Answer:
A: ZnS(s) + 2O2(g) --> ZnSO4(s)
Explanation:
;) good luck
Answer:
The answer is A or the first choice
Explanation:
ZnS(s) + 2O2(g) Right arrow. ZnSO4(s)
HAVE A GREAT DAY STAY SAFE
How many atoms are there in 1.005 moles of CO2?
Answer:
[tex]6.05211\times 10^{23}\ \text{atoms}[/tex]
Explanation:
Moles of carbon dioxide = 1.005 moles
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Number of atoms is given by
[tex]\text{Moles}\times N_A=1.005\times 6.022\times 10^{23}[/tex]
[tex]=6.05211\times 10^{23}\ \text{atoms}[/tex]
The number of atoms in the given amount of moles of carbon dioxide is [tex]6.05211\times 10^{23}\ \text{atoms}[/tex].
4. For water, H20 represents
only the empirical formula
only the molecular formula
only the structural formula
both the empirical & molecular formulas
Answer:
The empirical and molecular formula because the ratio is 2:1 and there is 2 hydrogen atoms and 1 oxygen atom.
Hope this helps!
Four alleles determine if a rabbit is white, brown, or gray. This is an example of *
a.)incomplete dominance
b.)polygenic inheritance
c.)multiple alleles
d.)codominance
Answer:
imcomplete dominance
Explanation:
because it is
three examples of resistors
Answer:
fixed resistors, variable resistors, resistance dependent on a physical quantity
Without changing temperature, how could you increase the pressure of a gas a hundredfold? (100 times greater)?
Answer:
yes 100 greater
I HOPE THIS HELPS
One mol of air contains 0.74 moles of nitrogen gas and 0.25 mol of oxygen gas. Compute the partial pressure of these gases at a total pressure of 1.7 atm and at a total pressure of 4.7 atm.
Explanation:
Partial pressure of a gas is the product of the mole fraction of that gas, which is the ratio of the no. of moles of the gas to the total no. of moles, and the total pressure.
total no. of moles=0.74+0.25=0.99 mol
mole fraction of N2=0.74/0.99=0.7475
mole fraction of O2=0.25/0.99=0.2525
total pressure=1.7+4.7=6.4 atm
partial pressure of N2=0.7475×6.4=4.784 atm
partial pressure of O2=0.2525×6.4=1.616 atm
Question 7 of 10
The Sun has a diameter of about 865,000 miles.
Suppose you were making a scale model of the
solar system with a scale of 1 inch:1,000 miles.
How wide would the Sun be in your model?
A. 865,000 inches
B. 865 inches
C. 86.5 inches
O D. 8.65 inches
Answer:
you have to decide 865,000 with 1000 and the answer is 865
What are the two factors that can increase an object's elastic energy?
Answer:
The factors that determine the amount of elastic potential energy being stored include the type of material and the amount it is deformed. The more an object is deformed, the more stored energy it has.
How are gas particles arranged in a container?
Select one:
a.Far apart
b.Loosely arranged
c.Neatly organized
d.Tightly packed
helppppppppppppppppppppppp
ITS CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
PLEASE I NEED YOUR HELP, I WILL GIVE 10 POINTS PLEASEEEEE
People claim these rock formations in the Sahara Desert look like a mushroom and a chicken. They were not sculpted by humans. What do you think caused them to be shaped this way?
Answer:
Erosion
Explanation:
3. When the water level is higher outside the flask than inside, is the gas pressure inside the flask higher, lower or the same as atmospheric pressure? (Take your time to think about this. Perhaps think of what it feels like to be 10 feet under water.)
Answer:
The gas pressure inside the flask is higher than outside the flask ornthe atmospheric pressure.
Explanation:
Given a U-tube manometer with water in between each arm of U-tube. One end is open to the atmosphere while one end is sealed to a flask filled with a gas. The water in the open end of the tube is experiencing a pressure equal to the atmospheric pressure whereas the water at the end sealed of to the flask is experiencing pressure due to the gas in the flask.
If the water level in both arms of the tube are equal, then the pressure due to the gas is equal to atmospheric pressure.
If the water level in the arm sealed to the gas is higher than that of the open end, The gas pressure is less than the atmospheric pressure.
If the water level in the arm sealed to the flask is lower than the open end, the pressure due to the gas is higher than atmospheric pressure.
From the question, when the water level is higher outside the flask than inside, then the gas pressure inside the flask is higher than the atmospheric pressure.
Which of the elements shown below has 7 Valence e-? Help please timed!!!
Answer:
Fluorine
Explanation:
Valence means the outer most energy level
3. You believe that water boils at 212 degrees Fahrenheit (100 degrees Celsius). Write the numberon the scale from best to worst.
1. Your cousin said that he tested the temperature of water boiling and found that it was 100°C.
2. Most people you know believe that water boils at 100°C.
3. You used a thermometer to measure the temperature at which water boiled. You repeated the experiment 3 times. Each time the thermometer read 100°C.
4. You read an article in a science journal from 50 different labs around the world that have tested the temperature of water and found that it boils at 100°C in every location.
You come across an article in a scientific journal from 50 different laboratories around the globe that measured the boiling point of water and discovered that it is 100°C everywhere.
What transpires when water is heated to 100 C (This is 212 F)?Water turns into gas around 212°F (100°C), which is the temperature at which it begins to boil (water vapor). Pressure affects the melting/freezing and boiling points. Water's boiling point changes when air pressure changes. The boiling point decreases with increasing altitude or decreasing pressure.
At 212 degrees Fahrenheit, does water boil, or at 100 degrees?Water has a freezing point of 32 degrees Fahrenheit and a boiling point of 212 degrees Fahrenheit on the Fahrenheit scale.
To know more about laboratories visit:-
https://brainly.com/question/28233400
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Convert the following temperature units (Hint: K = °C +273)
A) 50°C = __________ K
B) 288 K = __________°C
Answer: a- 323 b- 15
Explanation:
