Answer:
Explanation:Elements of the periodic table are arranged in order of increasing atomic number. The periodic law states “When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.”
who was the first person to go to the moon
Answer:
The first person to go to the moon
Explanation:
Neil Armstrong was the first person !
heres more info on NASAs page!
https://www.nasa.gov/audience/forstudents/k-4/stories/first-person-on-moon.html
How is an exothermic reaction indicated in an equation?
O A. Heat is written above the arrow in the equation.
O B. Heat is included as one of the reactants.
O C. Heat is included as one of the products.
D. Heat is added to both sides of the equation.
Answer:
Heat is included as one of the products for eg:
C+O2 gives CO2 + heat
hope it helps!
If the volume of a gas is decreased by changing the shape of the container, the number of collisions per area between the molecules and the container walls will increase. This corresponds to an increase in the gas pressure, which is the force exerted per area. What gas law is kinetic molecular theory of gases (KMT) explaining in this case
Answer:
If the volume of a gas is decreased by changing the shape of the container, the number of collisions per area between the molecules and the container walls will increase. This corresponds to an increase in the gas pressure, which is the force exerted per area.
Which one of the following is the correct relation?
v = u – at
v2 = u2 – 2as
v2 = u2 + 2as
v = at - u
Answer:
v2 = u2 + 2as
it is the correct answer
why the earth is green
Answer:
the earth is green because the green part is the plants and tree.
Answer:
The excess carbon dioxide in the atmosphere has created a greener planet,
Explanation:
Briefly describe Ka. How does Ka relate to acid strength? Describe how you can use the pH of an aqueous acid solution and its initial concentration to determine the Ka.
Answer:
Ka is also known as Acid dissociation constant. It is the equilibrium constant of the dissociation reaction of an acid and is denoted by Ka.
Explanation:
Ka is a measure of acid strength. A larger equilibrium constant means that the reaction has a greater tendency to drive towards the products side ( more H2O- and A- Less HA). Another way of saying this is that the acid has a stronger tendency to donate it's H+ which is the definition of a stronger acid.
What is the volume occupied by 2.34 grams of CO2 gas at STP?
Answer:
The volume occupied by 2.34 grams of CO2 gas at STP is 1.18 L
explain all the 4 quantum numbers in detail
[tex]HELLO![/tex]
To completely describe an electron in an atom, four quantum numbers are needed:
Energy (n).Angular momentum (ℓ).Magnetic moment (mℓ).Spin (ms).[tex]MiraculousAlejandra[/tex].
What is occurring during boiling?
A. Solvent particles increase in kinetic energy until they knock solute particles out of the solution and into the air.
B. Solute particles increase in kinetic energy until they knock solvent particles out of the solution and into the air.
C. Vapor pressure is greater than atmospheric pressure and water molecules escape from the solution into the air.
D. Atmospheric pressure is greater than vapor pressure, and water molecules escape from the solution into the air.
Reset Selection
Answer:
D: Atmospheric pressure is greater than vapor pressure,and water molecules escape from the solution into the air.
Atmospheric pressure is greater than vapor pressure, and water molecules escape from the solution into the air, which occurs during boiling. The correct option is D.
What is boiling?Boiling is a process when more heat is given to any liquid, it starts to boil. When the temperature is increased, boiling happens, but only in liquid. The molecules of liquid start to turn into vapor and start to escape into the atmosphere.
It is also called the vaporization of the liquid. The boiling points of different liquids are different, and they start to boil at their own temperature.
Thus, the correct option is D. Water molecules escape from the solution into the air when atmospheric pressure exceeds vapor pressure.
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The rate of diffusion of gas A is double the rate of gas B. The ratio of their molecular weight is
Answer:
Ratio is 4:1
Explanation:
from graham's law of gaseous diffusion:
[tex]{ \bf{ \frac{R _{A} }{R_{B} } = \sqrt{ \frac{M_{A} }{M_{B}} } }}[/tex]
but Ra = 2Rb:
[tex]{ \sf{ (\frac{2}{1} ) {}^{2} = \frac{M _{A}}{M _{B} } }} \\ \\ { \sf{\frac{M _{A}}{M _{B} } = \frac{4}{1} }} \\ \\ {M _{A}} : {M _{B} } = 4 :1[/tex]
Which soil would most likely be found in the Arctic?
Answer:
The answer is B
Explanation:
Gelisols
match electrons answer help
Answer:
carbon- 4
hydrogen- 1
magnesium- 2
oxygen- 6
hope it helps!
Answer:
CARBON - 4 VALENCE ELECTRONS HYDROGEN - 1 MAGNESIUM - 2 OXYGEN - 6A scientist claims that the water molecules that you drink today could be millions of years old. Use evidence from the water cycle to support the scientist’s claim.
Answer:
As water on the surface of lakes, oceans, and rivers warms up, it travels into the sky as very tiny droplets, or vapor. When the water vapor gets colder, it turns back to liquid to help form clouds.
When the liquid gets so heavy it can’t stay in the atmosphere anymore, it falls, or “precipitates,” as rain, snow, sleet, hail, or, my favorite, graupel. Once the precipitation reaches the ground or lands in lakes, oceans, and rivers, the cycle continues.
Explanation:
A scientist claims that the water molecules that you drink today could be millions of years old in the water cycle the new clouds athat re made cannot rain but the clouds which are old do rain.
What is the water cycle?The water cycle or cycle of water is the journey of each and every water molecule by which it is made up of as the clouds in the environment are made up of the evaporation process in the environment.
The vapors of evaporation condense in the environment to form the clouds and these clouds are only responsible for the rain but the old and heavy clouds can only do it.
Therefore, in the water cycle, the new clouds are made cannot rain but the clouds which are old do rain scientist claim that the water molecules that you drink today could be millions of years old.
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I need help with b) c) and what is the electronic configuration of atom E
Answer:
(b) A and C belongs to same group.
(c) D is a non metal.
Explanation:
The Electronic Configuration of E is
[tex]1s {}^{2} 2s {}^{2}2p {}^{6} 3s {}^{2} 3p {}^{6} 4s {}^{2} [/tex]
Balance
Mg +O2
NH3+ H2SO4
H20+O2
Answer:
MgO2
H202
NH4)2SO4
Explanation:
hope this helps you
What is known about a reaction with a positive enthalpy?
Answer:
"Endothermic reaction: In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings of the reaction."
Explanation:
When enthalpy is positive and delta H is greater than zero, this means that a system absorbed heat. This is called an endothermic reaction. When enthalpy is negative and delta H is less than zero, this means that a system released heat. This is called an exothermic reaction.
What does a high positive enthalpy mean?
The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.
Learn more about the endothermic reaction here: brainly.com/question/6506846
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which of the following is soluble in water?
1-glycerin
2-sand
3-iron filing
4-oil
Answer:
glycerin
Explanation:
Glycerol is easily soluble in water, because the ability of the polyol groups to form hydrogen bonds with water molecules.
why does an endothermic reaction require a greater activation energy than an exothermic one?
Answer:
in most of the endothermic reactions the atoms gains electrons from one to another. since the atom gains electrons there is a electron repulsive force between the host and the guest electron . As stability is inversely proportional to electron repulsive force the atom gains energy to attain stability .
The endothermic reaction mostly come under electron affinity
Explanation:
hope this helps you
if I am wrong just correct me
need help asap!!!!!!!!!
Answer:
c. 2 and 3 only
Explanation:
When you compact the bag of trash you make it smaller, so the volume changes. And the density is the mass divided by the volume, so as the volume changed the density obligatorily change too
3. High-density polyethylene is made by polymerizing which starting molecule?
A. Ethanol
B. Ethane
C. Ethyne
D. Ethene
Answer:
Ethene
Explanation:
High-density polyethylene (HDPE) was introduced as a bearing surface in orthopedics in 1962 by Sir John Charnley from Manchester, England. Polyethylene is created through polymerization of ethene. It can be produced through radical polymerization, anionic polymerization, and cationic polymerization
In the figure a cyclist moves A to B and then to C.he could also go through the shortest path AC. Depending on this fact solve the following questions: Find the length of AC .Find the displacement and total distance covered.
Answer:
hope it helps you see the attachment for further information
Why does Ce2(SO3)3 have a lower solubility than KCl?
Answer:
Down vote
A saturated solution is at equilibrium (rate of dissolution is equal to rate of crystallization) with some equilibrium constant K1. If you change the temperature of the system at equilibrium, you will observe a different equilibrium constant K2. Whether the equilibrium constant increase or decreases is described by the Van't Hoff equation:
ln(K2K1)=−ΔHR(1T2−1T1)
So it depends on the sign of the enthalpy of reaction, in this case the enthalpy of dissolution.
Pls help!!! I will mark you as brainliest if you answer the question!!
PLS GUYS!!! HELP!!!!!!!!!!
1 — Element D and A ( Which are Sodium and aluminium )
2 — ( 2 + 8 + 3 = 13 electrons total ) Element A Because it's atomic number is 13.
3 — Element E Is stable. ( Which is Argon )
( Note, Elements which has 8 election on its outermost cell is stable. ( Helium is exception which is a noble gas but have 2 electrons in outermost cell )
4 — Element F , which is hydrogen. ( Hydrogen is the only element to not have any neutron )
5 — Element D ( Which is sodium )
6 — The element F ( Which is hydrogen ) Don't contain any neutron.
________________________________
Explain the reaction that would occur in a galvanic cell between solutions of Al 3+and Pb 2+ . Identify the oxidation and reduction reactions and the location of each reaction. Then, use the standard reduction potential tables to determine the cell potential.
Answer:
Al ==> Al^3+ + 3e
Pb^2+ + 2e ==> Pb
Oxidation is the loss of electrons. Reduction is the gain of electrons. Which half rxn above lost and which gained?
For the potential of the cell, look up the reductions potentials, change the sign of the Al half cell, add in the potential for the Pb and add them.
Explanation:
QIV: Give one example each of the following:
1. Opaque objects.
2. Non-luminous objects.
3. Homogeneous medium.
4. Heterogeneous medium.
5. Transparent objects.
6. Translucent objects.
7. Luminous objects.
8. Man made source of light.
9. Objects that reflect light.
Answer:
s
Explanation:
1- Wood
2-Moon
3-Pure water
4-Sand and water
5-Glass
6-Paper
7-Sun
8-Flashlights
9-Glass or polished metal
If you don't like my examples then sorry
HELP URGENT PLS!1!! In what direction and how many spaces must you move the decimal point to make the following conversion?
600 L to mL
left; 6 spaces
left; 6 spaces
left; 3 spaces
left; 3 spaces
right; 6 spaces
right; 6 spaces
right; 3 spaces
To convert from L to ml, we move three spaces to the right and the decimal place moves three places.
Our task here is to convert 600 L to mL. we have to remember that to convert from L to ml, we have to multiply the value in L by 1000
In other words, the value 1000 is known as the conversion factor.
When we do this, we move the decimal place three places to the right to have 600000.00mL
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Which of the following is a scientific question you could ask about the game
of basketball?
A. Do you enjoy basketball more than volleyball?
B. Which team is this year's best?
C. Which player should be traded to another team?
D. Do teams that practice more win more games?
SUBMIT
The scientific question related to the game of basketball is option D: "Do teams that practice more win more games?"
This question is scientific because it explores a cause-and-effect relationship between practice and game outcomes. It can be investigated through empirical observation and data analysis.
To answer this question, researchers could collect data on the practice hours of different basketball teams and compare them to their corresponding game performance. Statistical analysis could be used to determine if there is a correlation between practice time and winning percentage or other performance metrics.
By examining a large sample of teams over an extended period, researchers could draw conclusions about the impact of practice on game outcomes. This scientific inquiry would contribute to the understanding of the factors that influence team success in basketball and could potentially inform training strategies and coaching techniques.
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Which elements on the periodic table are the least reactive? (1 point)
o the group with helium at the top
the group with hydrogen at the top
the group with carbon at the top
the group with fluorine at the top
Answer:
the group with helium at the top
Explanation:
I just took it
10th grade chemistry pls help!!
Express each answer to the correct number of significant figures.
Answer:
410-52=358
3.054+1.16=4.214
WILL MARK BRAINLIEST IF YOUR ANSWER IS CORRECT
Answer:
1. Element
2. Compound
3. Heterogeneous mixture
4. Homogeneous mixture
5. Homogeneous mixture
6. Heterogeneous and homogeneous mixture
7. Homogeneous mixture
8. Heterogeneous mixture
