Answer:
PLEASE MARK AS BRAINLIEST!!
Explanation:
Calcium has an atomic number of 20 and an atomic mass of 40
The mass number of an isotope is the sum of the number of protons and neutrons in the atomic nucleus. The atomic number is the number of protons. The calcium-40 isotope has a mass number of 40 , and an atomic number of 20 , therefore it has 20 protons.
What are some examples of HIGH resistance? Question 2 options:
long wire, wide wire, more resistors
wide wire, short wire, less resistors
long wire, narrow wire, more resistors
narrow wire, less resistors, long wire
(PLEASE HURRY! I NEED TO FINISH THIS QUIZ)
Answer:
long wire, wide wire, more resistors
long wire, narrow wire, more resistors
Explanation:
longer wires have greater resistance. The longer the wire the greater the resistance.
The answer is Long wire, Narrow wire, more resistors
Evidence:
How many grams of calcium are made up by 2.68 x 1023 atoms?
Answer:
Mass = 17.8 g
Explanation:
Given data:
Number of atoms of Ca = 2.68 × 10²³
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.68 × 10²³ atoms × 1 mole /6.022 × 10²³ atoms
0.445 mol
Mass in gram;
Mass = number of moles × molar mass
Mass = 0.445 mol × 40 g/mol
Mass = 17.8 g
Mercury is an element that forms during _____
Answer:
forms of mercury
Explanation:
Answer:
Explanation:
Mercury is an element and a metal that is found in air, water, and soil.Mercury rarely occurs uncombined in nature, but can be found as droplets in cinnabar (mercury sulfide) ores. China and Kyrgyzstan are the main producers of mercury. The metal is obtained by heating cinnabar in a current of air and condensing the vapour.
hope this helps! Have a good day or night! :)
Which of the following statements explains the difference between a lease and a loan?
a. At the end of a loan the car belongs to you, but at the end of a lease, the car still belongs to the
lease company
b. At the end of a loan, the car still belongs to the lease company, but at the end of a lease the car
belongs to you.
c. A loan requires a large down payment at the beginning while a lease does not.
d. A lease requires a large down payment at the beginning while a loan does not.
Please select the best answer from the choices provided
Answer:
letter A is the answer
Explanation:
At the end of a loan the car belongs to you, but at the end of a lease, the car still belongs to the lease company.
Which of the following chemical formulas contains the most molecules?
A. 5CO
B. 3H2O
C. 2Fe2O3
D. 4C3H8
i will give braniliest
During World War II, the Nazi government in Germany imprisoned and murdered millions of Jews. This is known as the _____.
A.Fascism
B.Holocaust
C.Nationalism
D.Great Depression
Answer:
B
Explanation:
Choose the correct one plz!
Answer:
b
Explanation:
Answer:
13 N to the right
Explanation:
PLS HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Neptune
What is the orbit of the Neptune?
Is the Sun at the center of the Nepturn’s orbit?
Describe the motion of Neptune throughout its orbit? Does it move at constant speed?
Answer: with what
Explanation:???
Answer:
165 years.
Neptune completes one orbit around the Sun for every 164.79 orbits of Earth.
Explanation:
what is the structural formula of propene
Explanation:
Structural formula of propene
H₃C–CH₂=CHmolecular formula = C₃H₆
molecular mass = 12×3+1×6 = 36+6 = 42
no. of double bond = 1
In an experiment, what responds to the change of the independent variable?
Answer:
Independent Variable
Explanation:
Need help!!! Don’t understand
How does the fuel become more radioactive?
Answer:
I think it's B
Explanation:
I took the exam
PLEASE SOMEONE HELP ME ANSWER THIS!!!! i’m desperate:,,(
Answer:
See detailed solution below
Explanation:
Now, let us solve each question step by step.
1) Given that;
N = amount of radioactive material at time t
No= amount of radioactive material originally present
t = time required for N amount of radioactive material to remain
t1/2= half life of the radioactive material
So,
N/No = (1/2)^t/t1/2
N/60 = (1/2)^22.8/3.8
N/60= (1/2)^6
N/60=1/64
64 N = 60
N = 60/64
N = 0.9 g
2) N/No = (1/2)^t/t1/2
N/8 = (1/2)^103.2/34.4
N/8 = (1/2)^3
N/8 = 1/8
8N = 8
N = 1 L
3) N/No = (1/2)^t/t1/2
50/No = (1/2)^18/6
50/No = (1/2)^3
50/No = 1/8
No = 50 * 8
No = 400 micrograms
4) N/No = (1/2)^t/t1/2
62.5/500 = (1/2)^26/t1/2
0.125 = (1/2)^26/t1/2
Since 0.125 = 1/8
1/8 = (1/2)^26/t1/2
(1/2)^3 = (1/2)^26/t1/2
Hence;
3 = 26/t1/2
t1/2 = 26/3
t1/2 = 8.7 hours
What physical property can be used to distinguish between a 1 cm cube of copper
and a 1 cm cube of sugar?
Select one:
a size
b. lustre
C. cost
d state
State physical property can be used to distinguish between a 1 cm cube of copper and a 1 cm cube of sugar. Hence, option D is correct.
What is physical property?A property (such as colour, hardness, boiling point) of the matter is not involved in its manifestation of a chemical change.
Physical properties are those general properties you notice most readily about a substance, such as its size, state of matter (solid, liquid, or gas), colour, mass, density and strength.
Values for physical properties can be determined by tests that don't alter the substance being tested.
Hence, state physical property can be used to distinguish between a 1 cm cube of copper and a 1 cm cube of sugar.
Learn more about the physical property here:
https://brainly.com/question/18327661
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Which substance is a homogeneous mixture? (3 points)
Cereal
Silver
Nickel
Shampoo
Answer:
Shampoo
Explanation:
Its a homo mixture because if you look at the way it is mixed you will
know it is a homogeneous mixture
How many elements are artificially made?
Answer:
May be 119 elements are artificially made.
Answer:
119 elements are artificially made...
What would happen to the rate of a reaction with rate law rate = k [NO]^2[H2] if
the concentration of NO were halved?
A. The rate would be four times larger.
B. The rate would also be halved.
C. The rate would be one-fourth.
D. The rate would be doubled.
The rate of a reaction would be one-fourth.
Further explanationGiven
Rate law-r₁ = k [NO]²[H2]
Required
The rate of a reaction
Solution
The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.
Can be formulated:
Reaction: aA ---> bB
[tex]\large{\boxed{\boxed{\bold{v~=~-\frac{\Delta A}{\Delta t}}}}[/tex]
or
[tex]\large{\boxed{\boxed{\bold{v~=~+\frac{\Delta B}{\Delta t}}}}[/tex]
The concentration of NO were halved, so the rate :
[tex]\tt r_2=k[\dfrac{1}{2}No]^2[H_2]\\\\r_2=\dfrac{1}{4}k.[No]^2[H_2]\\\\r_2=\dfrac{1}{4}r_1[/tex]
Answer:
C. The rate would be one-fourth.
Another option would be:
The rate would be four times larger
Depending on what class you're taking.
Explanation:
A force between an object and the surface it is moving over, is known as what?
power
O velocity
O force
O friction
a school bus drives 35 mph down the street and slows as it approaches the stop sign
Which element has the least density at STP?
Answer:
Helium, this noble gas has the least density at STP
Explanation:
........URGENT PLEASE HELP............
Answer:
12.0778
Explanation:
Formula for the compound that contains Mg2+ and O2-
Answer:
MgO.
Explanation:
charges of both satisfy one another (balanced) -- producing a compound MgO.
Gregor Mendel studied the traits of pea plants. Because of his contributions, he is known as the Father of?
Answer:
A monk, Mendel discovered the basic principles of heredity through experiments in his monastery's garden. His experiments showed that the inheritance of certain traits in pea plants follows particular patterns, subsequently becoming the foundation of modern genetics and leading to the study of heredity.
Explanation:
Answer:
Gregor Mendel (July 20, 1822 - January 6, 1884), is known as the Father of Genetics, is most well-known for his work with breeding and cultivating pea plants, using them to gather data about dominant and recessive genes.
Explanation:
You asked, I answered.
Hope this helped! :)
Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained
Answer:
They each have the same number of protons.
Explanation:
Full question: Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained. What is true about all uranium atoms?Answer:
They each have the same number of protons
Explanation:
All uranium isotopes have 92 protons in their nucleus. However, they differ in the number of neutrons in the nucleus, hence this also translates to varying mass numbers (which is the sum of neutrons and protons in the nucleus). The most common isotopes of uranium are; U-238, U-235, and U-234
PLEASE HELP! ITS URGENT! I GIVE BRAINLY
Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be produced in this reaction.112g Fe + 64g S → _____ g FeS *
a. 48g
b. 64g
c. 112g
d. 176g
Answer:
Its C
Explanation:
If you think about it logically all the other answers don't make sense A and B are to small of a number And D is to Big of a number
Hope this Helps!!
23. Soluble salts can be prepared using
the following methods except by
A. action of dilute acids on
metals.
B. action of dilute acid on an
insoluble base.
C. direct combination of
constituent elements.
D. neutralization reactions.
E. precipitation from solutions,
help ple*zzzz*zzz*
Answer:
I think crystallization is a write answer for this question
Explanation:
but according to this (E is the write answer)
Each organ system has specific functions for the body's survival. Which body system is responsible for carrying oxygen from the lungs to the body cells and transporting glucose for energy?
Group of answer choices
Answer:
Circulatory System
Explanation:
Blood carries oxygen to the rest of the body, as well as glucose.
idk helpppppppppppppp
Maybe Sugar I did that question before I think.
Answer: D
Explanation:
D is the correct answer since all of the others are basically food, depending on who eats them. Just read the little description before you try to answer the question so you won’t get confused next time.
What is the kinetic energy of 3500 kg bus that is moving at 25 m/s
Answer:
1093750 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
v is the velocity
m is the mass
From the question we have
[tex]k = \frac{1}{2} \times 3500 \times {25}^{2} \\ = 1750 \times 625 \\ = 1093750 \: \: \: \: \: [/tex]
We have the final answer as
1,093,750 JHope this helps you
SOMEONE HELP ME PLEASE I’LL GIVE BRAINLY
Answer:
i think that describes cohesion or hydrolysis
Explanation: