Answers
Answer:
9.32×10⁻³
Explanation:
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
. The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
How to add the number in scientific notation with same exponent.
7.21 ×10⁻³ + 2.11 ×10⁻³
exponent of both values are same thus we will take it common.
[7.21 + 2.11 ]×10⁻³
9.32×10⁻³
Related Questions
The rows in the periodic table are called periods.
What is true about elements in the same period?
Answers
Answer:
elements in the same period have the same number of shells
the period number the element is in, that is the number of shells it has.
What volume of silver metal will weigh exactly 2500g. The density of silver is 10,5 g/cubic centimeters.
Answers
Answer:
26250 cubic centimeters
Explanation:
What happens if an organism cannot carry out its life function?
Answers
Answer:
organisms cannot stay with out getting nutrients as they will not be able to repair them selves or produce energy.
Explanation:
explain how to balance the chemical equation, KClO3 ⟶ KCl + O2 and include all steps
Answers
The balance of chemical equation : 2KClO₃ ⟶ 2KCl + 3O₂
Further explanationEqualization (balance) of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction
[tex]\tt KClO_3\Rightarrow KCl+O_2[/tex]
1. Coefficient
KClO₃ ⟶ aKCl + bO₂
2. Equation
K ⇒ left =1, right=a ⇒a=1
Cl⇒ left =1, right=a ⇒a=1
O ⇒ left = 3, right = 2b ⇒3=2b, b = 1.5
The equation turns into :
KClO₃ ⟶ KCl + 1.5O₂
multiplied by 2
2KClO₃ ⟶ 2KCl + 3O₂
A student determines the density of an element to be 2.73 g/cm 3 . If the accepted value is 2.70 grams per cm 3 , what is the student's percent error? Identify the element. What is the boiling of this element in Celsius degree
Answers
Answer:
Explanation:
percentage error = error x 100 / correct value
= (2.73 - 2.70) x100 / 2.70
= 1.11 %
The element is Aluminium whose density is 2.702 grams / cc
Boiling point of Aluminium = 2519⁰C .
3. compounds in which elements are held together by covalent bonds...keeps their own properties
A polar molecule
B. element
C. compound
D. molecule
Answers
The kinetic energy of a moving object depends on its mass and its
a. volume.
b. velocity.
c. distance.
d. acceleration.
Answers
If a football is 625 mL volume and 0.64 g/mL density what is the mass
Answers
explanation
the formula for density is density equals mass divided by volume so you plug in .64 for the density and 625 for the volume. .64= m/625. to solve for mass you would multiply both sides by 625 to get the mass
Please answer correctly !!!!!!!! Will mark brainliest !!!!!!!!!!!!!!
Answers
Answer: uuhhhh pass
Explanation:
Answer:
It should be 0.8mL.
Explanation: Because you would subtract what the rock would be without the water.
[tex]5.6-4.8=0.8[/tex] Simple C:
the number of protons will tell you what elements it is. T or F plzz help
Answers
Answer:
True
Explanation:
There are two ways to tell elements apart from each other: the atomic number or the number of protons. The atomic number tells the number of protons in the element.
For example:
There are two given elements. One has 3 protons and an atomic number of 3 while the other has 7 protons and an atomic number of 7. Which one is Lithium?
Lithium has an atomic number of 3, which means it has three protons, which means Lithium is the one with 3 protons.
K+ Cl2 → КСІ balance equation
Answers
how long will take an object traveling at 25 m/s to reach a distance of 125 meters?
Answers
Answer:
5s
Explanation:
I need help with this. Plzzzzz
Answers
Answer:what do you nned help with
Explanation:
What is the relationship between the atomic mass of an element and a mole of that element's atoms?
Answers
Answer:
Each ion, or atom, has a particular mass; similarly, each mole of a given pure substance also has a definite mass. The mass of one mole of atoms of a pure element in grams is equivalent to the atomic mass of that element in atomic mass units (amu) or in grams per mole (g/mol).
Explanation:
The relationship between the given terms is provided below throughout the below segment.
One mole of such a component's atomic weights is approximately equivalent to that component's atomic mass. This same atomic mass of the oxygen element, for example, is about 16g. As a result, one mole containing oxygen atoms equals 16g of oxygen ([tex]O_2[/tex]). 1 mole containing oxygen atoms weighs 16g.We can say that,
→ [tex]1 \ mole \ in \ gram \ of \ an \ element = Atomic \ mass \ of \ an \ element[/tex]
Learn more about atomic mass here:
https://brainly.com/question/18333006
Which cell organelle controls the activities for the cell?
Answers
Answer:
[tex]the \: nucleus \:[/tex]
Explanation:
[tex]the \: nucleus \: is \: organelle \: that \: controls \\ \:a ll \: cellular \: activities.[/tex]
psoriasis is a disease that causes a red rash on the skin. which body system does psoriasis affect?
a. respiratory
b. integumentary
c. immune
d. digestive
e. circulatory
Answers
Answer:
The answer to this question is integumentary.
Explanation:
The answer is that because that is your skin area and so if you have a rash then if will affect that part.
It's b. integumentary
I got the test right
Which can change from one state of matter to another at the temperatures and pressures experienced at Earth’s surface?
oxygen
carbon dioxide
water
nitrogen
Answers
What element is the only Noble Gas in the s-block?
Answers
Answer:
Helium
Explanation:
Answer:
helium i guess i m not sure
Describe how the particle motion is different from state to state.
Answers
Answer:
The particles in a gas are moving very quickly in random directions.
The particles in a solid are tightly packed and locked in place, and they are vibrating in their place.
The particles in a liquid are close together (touching) but they are able to move/slide/flow past each other.
brainliet please?
x
A star's mass determines the —
A) shape of a Star
B) location of a star
C) length of its lifecycle
D) galaxy it belongs to
Answers
a person who has non-functional cone type won't be able to identify the_____________of
fill in the blank.
A.color
B. shape
C. size
Answers
Answer:
A
Explanation:
more domunit
Which symbol and unit of measurement are used for resistance?
symbol: R: unit :
symbol: 0; unit: R
symbol: R: unit o
symbol: R: unit R
Answers
Answer:
Unit of resistance is Ω (Omega).
Explanation:
The ability to measure the oppose the flow of electric current is called resistance of a circuit. Its relation with voltage and current is given by Ohm's law as follows :
V = IR
R is resistance
Its unit is Omega and it is represented by Ω.
The unit of the electrical resistance is ohm Ω
The symbol of resistance is R.
Hence Option A) Symbol: R, Unit : Ω is the correct answer
What is resistance?Resistance is simply the measure of the opposition to current flow in an electrical circuit.
Ohm’s law states that the potential difference between two points is directly proportional to the current flowing through the resistance.
V = I × R
Where;
V is the voltage or potential difference. I is the current.R is the resistance.The unit of the electrical resistance is ohm Ω
The symbol of resistance is R.
Hence Option A) Symbol: R, Unit : Ω is the correct answer
Learn more about Ohm’s law here: brainly.com/question/2364325
#SPJ5
Hi I really need help
Answers
Answer:
A
Explanation:
What is the frequency of an event?
Group of answer choices
Probability
Degree
Expected occurrence
Identification
Answers
hope this helps :)
Answer:
Probability
Explanation:
I
ER
FLINE JE PELENE BI
OSE ELETTES
SELFS EEE
BER
LE
0
Answers
Answer:
WOWKFBBAI9AIEHEBFKCOAKQQ
I need help with these two questions
Answers
halogens have 7
allali have 2
noble gases have 8
K = 1
P = -3
Ra= 7
Cl = -1
N = 5
O = 6
What mass of ethanol will All
a 250.0 ml container if its
density is 0.789 g/ml?
Answers
Answer:
The answer is 197.25 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 250 mL
density = 0.789 g/ml
So we have
mass = 250 × 0.789
We have the final answer as
197.25 gHope this helps you
Which of the following is the end product of a natural
radioactive series?
Answers
Answer:
Lead
Explanation:
Lead (Pb) is the end product of every natural radioactive series.
Are the oldest rocks in the canyon found near the bottom
Answers
Answer: yes they are
Explanation:
because its so hot and the heat just stays at the bottom
Which statement offers an explanation for why some parts of John Dalton's atomic theory were proven to be false?
Scientists today are more diverse and have more educational training
Mistakes were made in key calculations during experimenting
Extensive repeated testing was not completed to verify the results
Technology available at that time was limited.
Answers
Answer:d
Explanation:
Answer:
The answer is D
Explanation:
I took the test!