Answer:
8.36 g
Explanation:
From;
0.693/t1/2 = 2.303/t log (No/N)
t1/2 = half life of potassium-40
t = age of the sample
No= initial amount of the sample
N= amount of the sample at time t
Substituting values;
0.693/1.3 × 10^9 = 2.303/2.6 × 10^9 log (No/2.10)
5.33 × 10^-10 = 8.86 × 10^-10 log (No/2.10)
5.33 × 10^-10/8.86 × 10^-10 = log (No/2.10)
0.6 = log (No/2.10)
Antilog (0.6) = (No/2.10)
No = 2.10 × Antilog (0.6)
No= 8.36 g
Au HSO3 nomenclatura
According to cell theory - (select all that are true)
A. you are born with all the cells you will ever have.
B. all organisms are made of at least one cell.
C.cells are the building blocks of life.
D.all cells come from preexisting cells
Answer:
B. all organisms are made of at least one cell.
C.cells are the building blocks of life.
D.all cells come from preexisting cells
Explanation:
According to the cell theory that was proposed via the contribution of three scientists in 1830's namely: Matthias Schleiden, Theodor Schwann, and Rudolf Virchow, the following was stated:
- Cells are the basic and fundamental unit of life
- Living organisms are made up of one or more cells
- All cells arise from pre-existing cells.
From the above components, the following are said to be true and correlate with the universal cell theory:
B. all organisms are made of at least one cell.
C.cells are the building blocks of life.
D.all cells come from preexisting cells
An oxygen atom has 8 protons. What number of neutrons would make an
oxygen atom most stable?
A. 10
B. 6
C. 12
D. 8
D. 8
Hope this helps! :)
______________
Answer:
D: 8 neutrons would make it most stable
Which would have more mass: a mole of sodium or a mole of copper? How do you know?
Answer:
copper
Explanation:
so for this you can work out the mass for both and compare
so mass = moles × mr
so mass of sodium = 1 × 23= 23 g
and mass of copper = 1 × 63.5= 63.5 g
so copper have more mass :)
help me with this attachment please
Answer:
See explanation
Explanation:
Let us recall that the basic rule in writing balanced chemical reaction equations is that the number of atoms of each element on the right hand side of the reaction equation is the same of the number of atoms of the same element on the left hand side of the reaction equation.
The reaction of red hot iron and steam is written as follows;
3Fe + 4H2O → Fe3O4 + 4H2.
The decomposition reaction of ammonium dichromate is written as;
(NH4)2Cr2O7 → N2 + Cr2O3 + 4H2O
Reaction of aluminium, sodium hydroxide and water is as follows,
2Al + 2NaOH + 2H2O ----> 2NaAlO2 + 3H2
Reaction of potassium bicarbonate with sulphuric acid;
2KHCO3 + H2SO4 -------> K2SO4 + 2H2O + 2CO2
Reaction of zinc and sodium hydroxide is as follows;
Zn + 2NaOH→Na2ZnO2 + H2
Performance Task #4.3
If you will cross a parent with black eye color (BB) and the other is
brown eye (bb), what will be the color of the eyes of their offspring?
BB
b
b
Ex. Rr - Round
Ir - oblong
Genotypic Ratio:
BB
bb-
%
R
rrr
rr
Phenotypic Ratio:
%
Rr
re
Genotypic Ratio:
50% Rr
Bb
b
b
50% IT
Phenotypic Ratio: 50% round
50% oblong
Bb -
bb-
Genotypic Ratio:
%
%
Phenotypic Ratio:
(continuation at the back)
%
I need answers pls, help me brainliest ko po maka ans ng tama, report nonsense thanks.
Answer:
The offspring are all black eye colored.
Explanation:
Since we have genes BB for black eye color and genes bb for brown eye color, crossing the genes, the resulting genotypes in the offspring is Bb, Bb, Bb and Bb. We note that all the genes have the dominant B gene. Since the black eye color dominant gene is present in all the offspring, the offspring are thus all black-eye colored.
So, If you will cross a parent with black eye color (BB) and the other is
brown eye (bb), the offspring are all black eye colored.
Cooling the concentrated ammonia and hydrochloric acid before carrying out the experiment increased the time taken for the white cloud to form
A student hypothesized that the amount of sunlight a sunflower plant receives determines the number of sunflower seeds the plant produces. In his experiment,
the number of seeds produces is the
Manipulated variable
ЕОООО
Control variable
Dependent variable
Independent variable
Answer:
Dependent variable
Explanation:
In every experiment, there must be a dependent variable and an independent variable.
The independent variable is that variable that you have to manipulate in order to receive a response. E.g, in the experiment described in the question, the amount of sunlight a sunflower plant receives is the independent variable.
The dependent variable is the number of seeds produced. It is the response obtained by carefully manipulating the amount of sunlight
Which of these is a measure of the average kinetic energy of the molecules of a material? A.heat B.temperature C.thermal energy D.bonding energy
Answer:
b temperature
Explanation:
Temperature is a measure of the average kinetic energy of the particles in a substance
what is the change of state from gas to liquid
Vapourization and condensation. the actual 1 shud be vapourization.
Soluitions and solubility
Answer:
solutions are homogeneous mixtures of two or more solutes in a solvent
solubility is the ability of a solute to dissolve in a solvent
Explanation:
hope this is helpful
Calculate the number of moles of NaOH in an aqueous solution of 36 cm3 of 0.1 mol dm−3.
PLSS EXPLAIN WHAT YOU DO I DONT GET IT
Answer: The number of moles of NaOH is 0.0036 moles
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Moles of solute}\times 1000}{ \text{Volume of solution (mL)}}[/tex] .....(1)
Given values:
Molarity of NaOH = [tex]0.1mol/dm^3=0.1mol/L[/tex] (Conversion factor: [tex]1L=1dm^3[/tex]
Volume of the solution = [tex]36cm^3=36 mL[/tex] (Conversion factor: [tex]1mL=1cm^3[/tex]
Putting values in equation 1, we get:
[tex]0.1=\frac{\text{Moles of NaOH}\times 1000}{36}\\\\\text{Moles of NaOH}=\frac{0.1\times 36}{1000}=0.0036mol[/tex]
Hence, the number of moles of NaOH is 0.0036 moles
Which functional group does the molecule below have?
H H H H
H-Ċ-Ċ-Ċ-Ċ-0-H
| | | |
н ннн
O A. Amino
O B. Ester
O C. Ether
O D. Hydroxy
1-bromo-1-2-diphenylpropane
Answer:
Aldehyde
Explanation:
1-bromo-1-1diphenylpropane
Two students were discussing the Mono Lake ecosystem. The first student said, "For a 20-kilogram (kg) coyote to survive, it takes around 200 kg of Wilson's phalaropes, 400 kg of brine shrimp, and 800 kg of algae!" The second student said, "No, I think it takes even more than that." 1. Which student is correct? What is your reasoning?
Answer:
The second student is right.
Explanation:
The coyote feed on not only phalaropes but many other organisms present in the environment for its survival. There are many other organisms present in the ecosystem such as mice, squirrel, cactus fruit etc. The coyote feeds on phalaropes, the phalaropes feeds on brine shrimp and the brine shrimp feeds on algae for its survival so in this way the ecosystem moves in the forward direction. The coyote feeds on phalaropes so the energy that is present in phalaropes transferred into coyote which only 10 % while the remaining is released in the atmosphere in the form of heat energy.
Which of the following are examples of electromagnetic waves?
A.thunder, singing, tsunamis
B.sound, tsunamis, earthquakes
C.light, microwaves, radiation
Answer:
C
Explanation:
Electromagnetic waves travel at the speed of light and do not require molecules (gas, solid or liquid) to vibrate and travel.
Soundwaves when singing or from thunder vibrate particles to reach our ears and are known as mechanical waves.
12. Organelles allow eukaryotic cells to carry out more functions than prokaryotic cells.
True or false?
Answer:
True po
Explaination :
I hope it helps
2 A. Explain why these elements are all placed in Period 3 of the Periodic Table.
Answer:
which elements??? more info please
What is the final velocity of a 3 kg object that starts with a 5 m/s velocity due to a 2 N force acting over 3 seconds?
Answer:
V= 13 m/s
Explanation:
We're asked to find the magnitude of the object's velocity after a force is applied for
3
s
parallel to its motion.
We'll call the direction it's moving the positive
x
-axis, and the direction of the applied force the positive
y
-axis.
The components of the initial velocity are
v
0
x
=
5
m/s
v
0
y
=
0
(It's moving at
5
meters per second in the straight line we called the
x
-axis.)
We know the object's mass is
3
kg
, and the force applied is
12
N
in the positive
y
-direction. The magnitude of the constant acceleration is thus
a
y
=
∑
F
y
m
=
12
l
N
3
l
kg
=
4
m/s
2
Since this acceleration is directed upward, and the initial
y
-velocity is
0
, we can use the kinematics equation
v
y
=
v
0
y
+
a
y
t
to find the
y
-velocity after
3
seconds.
Plugging in known values, we have
v
y
=
0
+
(
4
l
m/s
2
)
(
3
l
s
)
=
12
m/s
No acceleration was applied in the
x
-direction, so it's
x
-velocity remains
5
m/s
. The magnitude of the velocity is thus
v
=
√
(
v
x
)
2
+
(
v
y
)
2
=
√
(
5
l
m/s
)
2
+
(
12
l
m/s
)
2
=
13
m/s
7. A sample of a compound that contains only chlorine and oxygen reacts with excess hydrogen to produce 0.233 grams of hydrochloric acid and 0.403 grams of water. Determine the empirical formula of this compound.
Answer:
ClxOy + H2 > HCl + H2O
HCl = 0.233/37 = 0.006 mol H2O = 0.403/180.02 mol
HCl = 0.006/0.022 H2O = 0.022/0.006
= 1 = 4
Cl2O4 + 5H2 > 2HCl + 4H2O
I'm think that's the answer
In a mass spectrum, there are two peaks, one at m/z 63.0 with percentage abundance 69.1% and another peak at m/z 65.0 with percentage abundance 30.9%. Determine the relative atomic mass (Ar) for this element, giving the answer to 3 significant figures (no units required).
Explanation:
hope the picture above help u understand:)
The relative atomic mass (Ar) of this element is approximately 63.6 (to three significant figures).
To determine the relative atomic mass (Ar) of the element, we use the following formula:
Ar = (m₁ × % abundance1 + m₂ × % abundance2) / 100
Where:
m₁ and m₂ are the masses of the isotopes (peaks) in the mass spectrum,
% abundance1 and % abundance2 are the percentage abundances of the corresponding isotopes.
Given information:
Peak at m/z 63.0 with a percentage abundance of 69.1%.
Peak at m/z 65.0 having a percentage abundance of 30.9%.
Calculate the weighted average mass of the element's isotopes.
Ar = (63.0 × 69.1 + 65.0 × 30.9) / 100
Ar = (4347 + 2009.5) / 100
Ar = 6356.5 / 100
Ar ≈ 63.565
Noe, let's round the calculated mass to three significant figures.
Ar = 63.6
So, the relative atomic mass (Ar) of this element is approximately 63.6 (to three significant figures). This means that the average mass of the element's atoms is approximately 63.6 times the mass of one-twelfth of a carbon-12 atom, which is the standard reference for atomic masses.
To know more about relative atomic mass here
https://brainly.com/question/25698972
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10. Give the number of protons, electrons, and neutrons in strontium-88.
O 38 protons, 38 electrons, and 88 neutrons
O 38 protons, 38 electrons, and 38 neutrons
O 38 protons, 38 electrons, and 50 neutrons
O 88 protons, 38 electrons, and 88 neutrons
Answer:
C.because protons and electrons are equal they will be 38 so neutron will be 50
H2 + CaCl2 --> 2HCl + Ca How many grams of HCl are made when 2.93 g of
Ca are made?
Answer:
H2 + CaCl2 -> 2HCl + Ca
How many grams of HCl are made when 2.93 g of
Ca are made?
Explanation:
From the given balanced chemical equation, it is clear that:
2mol. of HCl and 1mol. of Ca are produced.
2mol. of HCl weighs --- 73.0g
1mol. of Ca weighs --- 40.0g
Hence,
73.0g of HCl and 40.0g of Ca are produced.
When 2.93g of Ca is produced then, how many grams of HCl will be produced?
[tex]=> 2.93g Ca * \frac{73.0g HCl}{40.0g Ca} \\=5.35g HCl[/tex]
Hence, 5.35g of HCl is formed.
How many oxygen atoms are in the products of the balanced reaction below?
3Ca + 2AIPO4 + 2Al + Ca3(PO4)2
A. 12
B. 8
C. 3
D. 4
Answer:
B
Explanation:
production ca3(PO4)2
4x2=8
Which statement describes the energy conversion that takes place durin
photosynthesis?
A. Plants convert chemical energy to solar energy.
B. Plants convert kinetic energy to chemical energy.
C. Plants convert solar energy to chemical energy.
D. Plants convert solar energy to kinetic energy.
Answer:
C
Explanation:
Photosynthesis is use of light(photo---solar energy) to make(synthesize) food(chemical energy) and is done by producers(plant)
Which of the following is a nonrenewable energy source? O A. Solar B. Hydroelectric C. Natural gas D. Biomass
Answer:
C. natural gas
Explanation:
Solar comes from the sun, which if it became nonrenewable, we would be dead. hydroelectric comes from water and Dams, which water is reproduced through rain. Biomass are things like leaves, which are seasonally reproduced.
Complete the table by writing the name or formula of each compound and the type of bonding that it uses. You may refer to this list of polyatomic ions.
Explanation:
Dinitrogen monoxide: covalent bond
copper(||) hydroxide: ionic bond
Butane: Covalent Bond
Answer
Disulfur decafluoride S2F10 covalent
calcium sulfide CaSO3 ionic
Diphosphorus tetraiodide P2I4 ionic
dinitrogen monoxide N2O ionic
Aluminum chloride AlCl3 covalent
copper(II) hydroxide Cu(OH)2 ionic
barium sulfate BaSO4 covalent
butane C4H10 covalent
Explanation:
edmentum
Calculate the poH of a solution at 25°C which contains
1 x 10^-10 M of hydronium ions.
Answer:
4.000 hope this helps :)
Which of the following diagrams is the correct electron dot diagram for Ne?
Answer:
B.
Explanation:
The electron dot diagram which is also known as the Lewis electron dot diagram is a diagram that shows an atom's valence electrons by placing dots, which represent the valence electrons of the element, around the elements symbol
The element for which the electron dot diagram is found = Neon, Ne
The atomic number of neon, Ne = 10
The electronic configuration of neon = 1s²2s²2p⁶
The valence shell is the outermost shell having the highest value of the coefficient of the orbitals, n = 2s²2p⁶
The number valence electrons in neon = The number of electrons in the valency shell = 2 electrons + 6 electrons = 8 electrons
The number of valence electrons in neon = 8
Therefore, the electron dot diagram for neon will have 8 dots located around the Ne symbol, which gives option B
A student wants to make a 0.600 M aqueous solution of barium sulfate, BaSO4, and has a bottle containing 12.00 g of barium sulfate. What should be the final volume of the solution?
Find the numerical answer for this question and make sure to include the following:
What is the formula for molarity?
What is the molar mass for barium sulfate?
When you give your numerical answer, what are the correct significant figures and how do you know that is the correct amount?
Need this ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer: The volume of the solution is 85.7 mL
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}[/tex] .....(1)
We are given:
Molarity of solution = 0.600 M
Given mass of [tex]BaSO_4[/tex] = 12.00 g
We know, molar mass of [tex]BaSO_4=[(1\times 137.33)+(1\times 32.07)+(4\times 16)]=233.4g/mol[/tex]
Putting values in equation 1, we get:
[tex]0.600=\frac{12.00\times 1000}{233.4\times \text{Volume of solution}}\\\\\text{Volume of solution}=\frac{12.00\times 1000}{233.4\times 0.600}=85.68mL=85.7mL[/tex]
The rule of significant number that is applied for the problems having multiplication and division:
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
Here, the least number of significant figures is 3 that is determined by the number, 0.600. Thus, the answer must have these many significant figures only.
Hence, the volume of the solution is 85.7 mL