The % lithium by mass in a sample of pure lithium carbonate : 18.79%
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements
% Lithium (Li) in Li₂CO₃(lithium carbonate) will remain the same even if the mass amount of Li₂CO₃ changes
Ar of Li = 6.941 g/mol
MW of Li₂CO₃ = 73.891 g/mol
[tex]\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\5Li=\dfrac{2\times 6.941}{73.891} \times 100\%=18.79\%[/tex]
Ainsley wanted to know if caffeine impacted the rate a mouse learned a maze. He tested two groups of mice and timed them as they attempted to learn the maze. Lab group A received 5 mL of caffeine with their 20 g of grain. Lab group B received 20 g of grain without caffeine. Which is Ainsley's independent variable?
Answer:
Caffeine
Explanation:
In every study, there must be an independent variable and a dependent variable. The independent variable is being manipulated and its effect on the dependent variable is evaluated.
In this study, the independent variable is the administration of caffeine. Its effect on a rat's ability to learn the maze (dependent variable) is evaluated in the study.
PLZ ANSWER WILL GIVE BRAINLIEST
Given the data shown, what two substances react with vinegar? Hint: (+) = a reaction occurred, (-) = no reaction
Gelatin and baking powder
Gelatin and baking soda
Salt and corn starch
Baking powder and baking soda
Answer:
baking powder and baking soda
Explanation:
I know this from prior knowledge, also the graph shows the two with plus signs on vinegar, which means they both react to it. :)
Baking powder and baking soda
On the table they both have a "+" meaning a reaciton has occured.
Hope this helps, brainliest pls! :)
Are atoms the smallest particles we know about, or are there smaller ones?
Answer:
subatomic particles are smaller then atoms
help please
1. Covalent Bonds are formed when atoms
A. Give Electrons
B. Share Electrons
C. Take Electrons
Answer:
b. share electrons
Explanation:
(02.01 LC)
What is true of neutrons?
They have no charge and are located inside the nucleus.
They have no charge and are located outside the nucleus.
They are negatively charged and are located inside the nucleus.
They are negatively charged and are located outside the nucleus.
A minerals ______ is how it reflects light or how shiny it is
Answer:
Luster
Explanation:
Luster is how the surface of a mineral reflects light. It is not the same thing as color, so it crucial to distinguish luster from color. For example, a mineral described as “shiny yellow” is being described in terms of luster (“shiny”) and color (“yellow”), which are two different physical properties.
Answer:
A Minerals Luster
EXPLANATION:
The Minerals luster is how shiny a mineral is. Luster means a shine or radiance of something, like a polished crystal it gives a sheen of light because it is shiny versus a dirty, worn-out crystal.
HELP if all the forces acting on an object are balanced then
Answer:
As per Newton's first laws of motion, everybody continues to be at state of rest or of uniform motion in a straight line unless and until it is compelled by some external unbalanced forces acting on it.
Hence, it is the unbalanced force that changes the state of rest or motion of a body. Balanced force is responsible for keeping the body to be either in static equilibrium or in dynamic equilibrium.
As per the options given in the question, the last one is true for an object under balanced forces.
sorry if this doesn't work
Why might it be important to test one variable at a time when doing an experiment?
Answer:
If you change everything at once, you may not know what caused the end result.
Explanation:
If you have Variable A (Salt), Variable B (Potassium), and the Control of Water, you might mix everything together, so you mix salt, potassium and water together. It is known that Potassium reacts very aggressively in water, but since you mixed everything together, you might think that salt+potassium+water goes boom, while it is actually potassium+water=boom.
Two students have been researching the atomic theory in preparation for their chemistry test. Melanie stated that Thomson's discovery revolutionized the understanding of an atom more than Rutherford. Josue disagreed with Melanie, he stated Rutherford's discovery revolutionized the understanding of an atom more than Thomson. Which student do you agree with?
Answer:
Josue
Explanation:
J.J Thompson proposed the plum pudding model of the atom. In his proposition, the atom is a sphere of positive charges into which negative charges were embedded. This model of the atom did not significantly contribute to our present day understanding of atomic structure.
On the other hand Ernest Rutherford laid out the foundation for a more accurate understanding of atomic structure in his nuclear model of the atom. According to Rutherford, the atom consists of a positively charged massive core called the nucleus around which electron move in orbits. His idea was akin to the solar system with the sun at it's core and planets moving around the sun in orbits.
This his idea of the nuclear theory was held as fundamentally correct by Neils Bohr's model of the atom. Hence, his nuclear theory of the atom was a significant milestone in our present day understanding of atomic structure.
What is the source of most of our current knowledge of Mercury's appearance and geology?
Please answer quick !!
I need help with this question ASAP
the answer is thermal.......
Sodium easily combines with chorine is reactivity
answer
yes
Explanation:
(1) In an experiment for determining the density of water, the following results
were recorded.
-mass of an empty beaker = 65gm.
- mass of the beaker and water = 165gm.
the volume of water = 100Cm.
(Calculate the density of water)
Given parameters:
mass of an empty beaker = 65gm
mass of the beaker and water = 165gm
volume of water = 100cm³
Unknown:
Density of water = ?
Solution:
Density is the mass per unit volume of a substance;
Density = [tex]\frac{mass}{volume}[/tex]
To find the mass of the water ;
Mass of water = Mass of beaker and water - mass of an empty beaker
= 165g - 65g
= 100g
So input parameters and solve;
Density = [tex]\frac{100g}{100cm^{3} }[/tex]
Density of the water in the beaker = 1g/cm³
Calculate the oxidation number of sulphur in H2SO4
Answer:
42
Explanation:
my brother said
Pls Help asap no rocky
Where dose the energy that powers the water cycle come from?
Answer:
sun is the energy that powers the water cycle from
What element has the noble gas configuration [Ar]4s23d8
Answer:
argon
Explanation:
Answer:
Argon
Explanation:
Kendra conducts an experiment. She mixes two chemicals, resulting in a chemical reaction. Based on Kendra's
experiment, what can be concluded about the original matter before mixing?
It did not change in identity but did change properties.
It changed in identity but not properties.
It changed in identity and properties.
It did not change in identity nor properties.
Answer: It changed in identity and properties.
Explanation:
Answer:
C: It changed in identity and properties
Explanation:
Hope this helps! good luck :)
what is the mass of 9.6 x10^23 atoms of iron?
According to the Avogadro's number, the mass of 9.6 x 10²³ atoms of iron is 89.002 g.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Therefore,mass=9.6×10²³×55.84/6.023×10²³=89.002 g
Learn more about Avogadro's number,here:
https://brainly.com/question/11907018
#SPJ2
In a water molecule, oxygen attracts electrons more strongly
than the hydrogens do because an oxygen atom contains
more
in its nucleus.
Enter the answer
What is the volume of 3.0 grams of lead?
Answer:
it should be 0.01
Explanation:
What is generally true about the particles in a gas?
A. Gas particles are closer together and have stronger attraction between them than the particles in a solid.
B. Gas particles are closer together and able to conduct electricity better than the particles in a plasma.
C. Gas particles are farther apart and able to conduct electricity better than the particles in a liquid.
D. Gas particles are farther apart and have weaker attraction between them than the particles in a solid.
Answer:
D
Explanation:
PLEASE HELP
An engineer is designing a tire for heavy machinery, which statement
describes the clearest constraint that applies to the solution?
A. It must cost the consumer less than $200 per tire.
B. It must function safely under a heavy load.
C. It must be designed so that it has an appealing appearance.
D. It must be affordable for consumers.
Answer: it’s A
Explanation:
Answer:
It's A
Explanation:
help please i would really appreciate it thanks
Explain how errors in measurements can affect the safety of products?
Answer:
Its can affect the safety of products by, for example, if you put raw chicken in the oven and don't cook it for long enough, it can make you sick
Explanation:
The difference between the calculated and precise worth is referred to as an error or defect. For example, if the two machinists use the same device to detect measurement mistakes, it is not necessary that they obtain the same results. However, there will be a little difference between the two measurements, which is referred to as an error.
How much pressure is in the transition zone? Just need the answer.
☆<《 HOPE IT WILL HELP YOU 》>☆
Explanation:
The transition zoneis the part of Earth's mental. It is located between the lower mental and upper mental. It is between the depth of 410km TO 660km
Question 13 of 25
How has the work of chemists affected the environment over the years?
A. Chemists have both hurt the environment and helped the
environment by their actions.
B. Chemists have tried very hard not to impact the environment with
their work.
C. Chemists have ruined the environment through the misuse of
poisonous chemicals.
O D. Chemists have belan required to fix all environmental problems
that they have caused.
Answer: is A
Explanation:
how becuase i just take the test
Answer:
A
Explanation:
1.C3H8 + O2 --> H2O + CO2
(5 Points)
Balanced
O Unbalanced
Answer:
Unbalanced
Explanation:
The balanced equation would be:
C3H8 + 5 O2 ---> 4 H2O + 3 CO2
Metalliods have _______ proporties of metals and non metals.
a
both
b
neither
c
different
Answer:
A both
Explanation:
hope this helped
In my closet, I have 5 black shirts, 6 brown shirts, 3 light blue shirts, 5 white shirts, 2 green
shirts, 4 navy blue shirts. What is the total number of shirts?
Explanation:
i think if you add them all the total is 26
Answer:
25 shirts
Explanation:
5+6=11+3=14+5=19+2=21+4=25 (if u dont understand how I wrote that then) 5+6=11, 3+5=8, 2+4=6
11+8=19, 19+6=25
