Answer:
Hydrogen and helium are the most abundant elements in a star.
Explanation:
What mass of Cl2, in grams is contained in a 10.0L tank at 27oC and 3.50 atm pressure ? a. 1.42 grams b. 142 grams c. 1.01 kg d. 101 grams
Answer:
the correct answer is A
Explanation:
Energy is the ability to do __________.
Match the following family of elements to its group.
Explanation:
To solve this problem, we simply use the periodic table of elements which groups elements based on their atomic numbers.
The atomic number of an element is the number of protons it contains. The protons are the positively charged particles within an atom.
The vertical arrangement of elements on the periodic table is the group. The horizontal arrangement of elements is the period.Now;
Noble gases belongs to group 18
Alkali earth metals belongs to group 2
Halogens belongs to group 17
Alkali metals belongs to group 1
Transition metals belongs to group 3-12
When you add water to a strong acid what happens to the pH of the solution
Calculate the number of moles in 35.7 g of CH4
Answer:
[tex]\boxed {\boxed {\sf About \ 2.23 \ moles \ CH_4}}[/tex]
Explanation:
First, find the molar mass of CH₄
This compound is made of carbon (C) and hydrogen (H). Look on the Peirodic Table for the masses of both elements.
Carbon: 12.011 g/molHydrogen: 1.008 g/molNow, count the number of moles in the compound. There is no subscript on C, indicating 1 mole. There is a subscript of 4 on H, indicating 4 moles. We must multiply the molar mass of hydrogen by 4.
1 Carbon: 12.011 g/mol 4 Hydrogen: (4 * 1.008 g/mol)= 4.032 g/molAdd the 2 masses.
12.011 g/mol + 4.032 g/mol = 16.043 g/molNext, find the number of moles in 35.7 grams.
Use the molar mass of CH₄ as a ratio.
[tex]\frac{16.043 \ g \ CH_4}{1 \ mol \ CH_4}[/tex]
Since we want the units of grams CH₄ to cancel when we multiply, we must flip the ratio.
[tex]\frac{1 \ mol \ CH_4}{16.043 \ g \ CH_4}[/tex]
Multiply by 35.7 grams.
[tex]35.7 \ g \ CH_4 *\frac{1 \ mol \ CH_4}{16.043 \ g \ CH_4}[/tex]
The grams of CH₄ will cancel each other out. Since there is a 1 in the numerator, we can also move 35.7 to the numerator.
[tex]35.7 *\frac{1 \ mol \ CH_4}{16.043 }[/tex]
[tex]\frac{35.7 \ mol \ CH_4}{16.043}[/tex]
[tex]2.22526959 \ mol \ CH_4[/tex]
The original measurement given, 35.7 grams, has 3 significant figures (3, 5, and 7), so we must round to 3 sig figs.
For this number, it is the hundredth place.
The 5 in the thousandth place tells us to round the 2 to a 3.
[tex]2.23 \ mol \ CH_4[/tex]
There are about 2.23 moles of CH₄ in 35.7 grams.
any____has____sets of physical and chemical properties
is riding a bike potential energy or kinetic energy
Answer: Mechanical energy usually means the sum of the kinetic energy and potential energy. So when you ride your bike you hope that the muscular (chemical) energy is converted mainly into mechanical energy.
Explanation:
Answer:
Isn't it neither.
Explanation:Because potential is going up and kinetic is going down.
a Gardner crosses a plant with red flowers with one with white flowers. each plant is pure for its trait for flower color
if the gene for the flower color shows incomplete dominance what kind of coloring will the flower on the offspring plants most likely have
a. white and red
b. red only
c. pink only
d. white pink
Answer:
Pink only
Explanation:
AP3X
Protons + Neutrons =
Answer:
mass
Explanation:
1. The diagram models the forces acting on a box. 2N 2N- Box - 2 N 5 N Which of the following best describes the motion of the box?
Answer: The box is moving downward with increasing speed.
Explanation:
The diagram models the forces acting on a box. 2N 2N- Box - 2 N 5 N .The box is moving downward with increasing speed best describes the motion of the box.
What forces act on a box?The normal force acting on the box is equal to and opposite to its weight. This term equals the force of gravity when the box is on a level surface. To calculate the normal force of the box, use our given mass and gravity's acceleration.
When an object interacts with another object, it experiences a push or pull that causes it to change state, either from rest to uniform motion. It is a magnitude and direction vector quantity.
A representation of the forces acting on the object. The object is represented by a dot, and forces are represented by arrows pointing away from the dot. Force diagrams are another name for them.
Thus, The box is moving downward with increasing speed best describes the motion of the box.
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What is the potential energy of a 5 kg apple that is sitting on a 1.5 m high
tree branch? GPE=ham
Answer:
PE = 73.58 J
Explanation:
Given data:
Mass of apple = 5 Kg
Height of tree = 1.5 m
Potential energy = ?
Solution:
Formula:
PE = mgh
g = 9.81 m/s
by putting values,
PE = 5 Kg × 9.81 m/s × 1.5 m
PE = 73.58 J (Kgm²/s = J)
Which part of an atom is used to form bonds with other atoms?
Answer:
valence electrons
Explanation:
valence electrons
The infections that people get while they are in hospitals are commonly resistant to multiple drugs. What is a reason for the increased number of drug-resistant bacteria being found in hospitals?
A.
increased use of antibiotics in hospitals
B.
increased number of diseases in patients
C.
decreased sanitation facilities in hospitals
D.
decreased microbial growth in hospitals
Explanation:
d
hdjdjdjdjejdjjeuwuwuw
Answer:
D
Explanation:
I have this test as well
The sum of all forces acting on an object.
Answer:
net force. sjiejsnssjwjehw
Answer:
net force or result force
Explanation:
mark brainliest please
Balance the following equation:
_ H202 --> _H20+_02
When the equation is balanced, what would be the coefficient in front of H20
Type your answer...
Given :
A chemical equation :
H₂O₂ → H₂O + O₂
Solution :
We can see that there are 2 oxygen atoms in LHS and 3 on RHS .
So, we can reduce the oxygen atoms to two in THS by just dividing it by 2.
H₂O₂ → H₂O + [tex]\dfrac{1}{2}[/tex]O₂
Now, multiplying both sides by 2, we get :
2H₂O₂ → 2H₂O + O₂
Therefore, the balanced chemical equation is 2H₂O₂ → 2H₂O + O₂ .
lennox needed $5400 to buy a refrigerator.
he borrowed this sum of money years at 13% per annum from a bank .
how many dollars does he owe the bank?
Answer:
he owes the bank 87%
Explanation:
A radioactive nucleus can change from one element to another. How does this happen?
A radioactive decay is occurring by the emission of charged particles such alpha or beta to form a new stable atom with changes mass number and atomic number.
What is radioactive decay?Heavy unstable radioactive elements undergo nuclear decay by which they form a stable isotope or new atom with changed atomic number. There are two types of nuclear decays mainly. They are alpha decay and beta decay.
During alpha decay isotopes with higher mass number undergo alpha emission and forming a new species with mass number reduced by 4 units and atomic number reduced by 2 units.
In the case of beta- decay, electrons are emitted from the atom and then forming a new atom with atomic number increased by one unit. For an electron capture process, an electron is captured to the atom forming an element with atomic number reduced by one.
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True Or False? A magnet slows down because it created an opposing electric force as it fell.
Answer:
faules
Explanation:
truck it
12. Which noble gas is expected to show the largest deviations from the ideal gas
behavior?
A) helium
B) neon
C) argon
D) krypton
E) xenon
The energy that plants need for photosynthesis comes from
OA.
minerals,
OB. sunlight
OC.
oxygen
OD.
water.
Answer:
OB sunlight
Explanation:
it grows with it
HELP ASAP EILL MAKE BRAINLEST Students are conducting a la estimating the time takes for the cell cycle in normal chocols They find that the average time for one complete el cycle is 22 hours What arence would they expect to see nerous chien
Cancerous chicken cels will spend more time in the phase
Cancerous cells will not complete all phases of the cell cyce
Cancerus chin cells will complete moss in a shorter amount of time
O Cancerous chicken cols and normales will have the same total amount of time to complete the cell cycle
Answer: I don't know if this helps but here's some information I think might help.
Usually, cells will take between 5 and 6 hours to complete S phase. G2 is shorter, lasting only 3 to 4 hours in most cells. In sum, then, interphase generally takes between 18 and 20 hours. Mitosis, during which the cell makes preparations for and completes cell division only takes about 2 hours. Calculate the percentage of time spent in each phase by counting the total number of cells in each phase (total in interphase, in prophase, etc.) and dividing each by the total number of cells you counted. How do cancer cells differ in total time required for mitosis? Cancer cells produce 117 minutes faster than regular cells. ... Normal cells require 640 minutes during interphase, cancer cells only need 380. For prophase, cancerous cells need 15 minutes less than regular cells. Another hallmark of cancer cells is their "replicative immortality," a fancy term for the fact that they can divide many more times than a normal cell of the body. In general, human cells can go through only about 40-60 rounds of division before they lose the capacity to divide, "grow old," and eventually die 3.
Is this equation balanced as is?
Ca(OH),
Cao
+
H,0
yes
no
Answer:
i think its yes
Explanation:
Answer: the answer is yes
Explanation: I know because I had it on my chemistry test yesterday
What is an intramolecular force?
Answer:
D. A force acting between the atoms within a molecule.
is Boiling water a chemical or physical change?
♥answer♥
Physical
♥explanation♥
Physical changes alter only the size, shape, form or matter state of a material. Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes.
♥plz give me brain list it would really help a lot♥
♥ お力になれて、嬉しいです！♥please;( urgent CuSO4•5H2O is blue
A chemical bond I i which 2 pairs of electrons are shared between two atoms
Double Covalent Bond
What is another way of describing a freezing point change?
A. Condensation point change
B. Melting point change
C. Evaporation point change
D. Boiling point change
Freezing is the physical change of matter where the solids are formed from the liquids. Freezing point change is described as melting point change. Hence, option B is correct.
What is temperature?
Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius. The freezing point is the temperature at which the vapor pressure of the liquid solvent becomes similar to the vapor pressure of the solid-liquid.
Melting is equivalent to freezing: a temperature when a solid becomes a liquid. Melting and freezing are the two contradicting changes in the phase of matter that involves the solids and the liquids phases. The melting points are higher than the freezing points.
Hence, option B. the melting point change is the correct option.
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atomic concept map. help me fill this out with the terms on the right. 40 points.
Answer:
can you like number them please? it would make it a lot easier
Explanation:
A coffee cup calorimeter contains 153.21 g of water at 22.50 °C. A 65.454 g piece of iron is heated to 101.62 °C. The piece of iron is added to the coffee cup caloriemter and the contents reach thermal equilibrium at 25.68 °C. The specific heat capacity of iron is 0.449 Jg·K and the specific heat capacity of water is 4.184 Jg·K. How much heat, , is lost by the piece of iron?
Answer:
Q = 2232J
Explanation:
In the system, the energy that is lost by the iron is:
Q = S*ΔT*m
Where Q is heat, S is specific heat of iron ΔT is change in temperature and m is mass of the piece of iron.
S = 0.449J/gK
ΔT = 101.62°C - 25.68°C = 75.94°C
m = 65.454g
Q = 0.449J/gK*75.94°C*65.454g
Q = 2232J
Please help......A 0.01 g bullet travels with a velocity of 1500 m/s. What is its momentum?
Answer:
hope this helps you
Explanation:
Example 1: A 20 kg object has a velocity of 4.5 m/s in the positive x direction. ... What is the momentum of a 3000 kg truck traveling at 25 m/s? 2. A 1500 kg ferryboat has a momentum of 25000 kg∙m/s. ... *A 0.01 kg bullet has a speed of 700 m/s before it strikes a 0.95 kg wooden block ... We will be going outside so please.