Explanation:
e 20 neutrones
Answer:
31 neutrons
Explanation:
Potassium has 19 protons (you can tell by the atomic number)
Potassium-50 is an isotope, meaning that there are a different amount of neutrons than normal.
Protons never change so subtract 50 from 19 to get the number of neutrons.
Help ASAP I will mark brainliest for the correct answer !!!⚡️⚡️⚡️
Answer:
A) 0.5h
Explanation:
Using the formula,
speed=[tex]\frac{distance}{time}[/tex]
Substituting given values
1224=612/time
time=0.5h
!! brainliest answer !! please help it's due tonight :)
Answer:
3. D
28. also known as Freon 12
Explanation:
What is the oxidation state of CI in CIO-
-1
+2
+1
0
Answer:
+1
Explanation:
Most halogens form compounds by
(1 Point)
gaining an electron to form a negative ion.
losing an electron to form a positive ion.
losing protons.
joining with both calcium and carbon.
I need help answers these questions, I don’t know what the question is asking.
Answer:
just look at the subscripts, the tiny numbers. in C4H4O4 , there are 4 C molecules, 4 H, and 4 O
Explanation:
hope this helps. good luck
Explain lab safety rules and procedures when in the science lab. Telpas PLEASEEEE
Answer:
globe globe
Explanation:
Always wear goggles. Chemical splash goggles should be worn any time you are working with open flame, chemicals, or glassware
Wear appropriate clothing. Baggy clothes and long sleeves can be dangerous when working with chemicals, glassware, or an open flame. Some labs may require a lab coat.
Tie back long, loose hair. Long hair can get into chemicals or into an open flame.
Never taste anything in the lab unless told to do so. Do not taste to identify unless told by teacher. Even if you know it is water in a beaker, the beaker is dirty
Do not apply makeup in class. Chemicals can get into makeup
Distracted from lab. Do not eat or drink in lab
Chemicals can get into food. Spilling may ruin lab.
Wash your hands after lab is complete. Wash with soap and water even if you have gloves on. Use sinks in classroom.
Do not smell chemicals directly. Place chemical in container, hold it at arms length and wave hand over liquid to fan the fumes toward you.
Never remove lab materials from classroom.
Follow all lab procedures. Don't skip any steps and don't add extra steps. If you are unsure ask the teacher.
Never do extra experiments when finished with lab. Only do the lab that is assigned.
Always work in group. Never work alone. Must work in group whether you are friends or not. Do not go ahead of your group.
Stay at lab station. no wandering around room to visit other groups.
Know how to use lab equipment and use properly. lab equipment is not a toy. equipment is expensive and hard to replace.
keep equipment away from edges of counter top too close to the edge and it may fall and break.
No adult and you cannot be in the room. Wait patiently in the hall
No horseplay or pranks in the lab. may lead to serious injury.
clean up spills immediately, even water can be dangerous. depending on the substance you or the teacher will clean it up.
keep lab area clean. cluttered tables and aisles may lead to injury or broken equipment.
Report unsafe conditions or accidents to teacher immediately
do not try to fix broken equipment or give first aide on your own.
Know where all lab safety equipment is located.
eye wash station
shower
first aid equipment
Know how to work all of these
6.
This part of Earth's atmosphere blocks the sun's harmful rays.
Ozone layer
Stratosphere
Mesosphere
Troposphere
Answer: THE ANSWER IS OZONE WEEEE a layer in the earth's stratosphere at an altitude of about 6.2 miles (10 km) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.
Explanation:
Answer: The answer is The Ozone layer
describe the behavior of the molecules in a liquid. Explain this behavior in terms of intermolecular forces.
The term “INTERmolecular forces” is used to describe the forces of attraction between atoms, molecules, and ions when they are placed close to each other.
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
In a liquid, intermolecular attractive forces hold the molecules in contact, although they still have sufficient KE to move past each other. Intermolecular attractive forces, collectively referred to as van der Waals forces, are responsible for the behaviour of liquids and solids and are electrostatic in nature.
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No one is helping me
Answer:
displacement =1025km
time=6hours
Explanation:
velocity=displacement /time=1025/6=170.8km/h
A 32.14 gram sample of a hydrate of MnSO4 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 17.51 grams of the dehydrated compound remained. What is the formula of the hydrate?
Answer:
MnSO₄.7H₂O
Explanation:
To solve this question, we need to convert the mass of the dehydrated MnSO₄. The difference between mass of the hydrate and dehydrated compound is the mass of water. With the mass we can find the moles of water and the formula of the hydrate:
Moles MnSO₄ -Molar mass: 151g/mol-:
17.51g * (1mol / 151g) = 0.116 moles
Moles H₂O -Molar mass: 18g/mol-:
32.14g-17.51g = 14.63g * (1mol / 18g) = 0.813 moles
The ratio of moles MnSO₄: Moles H₂O represent the amount of water molecules in the hydrate:
0.813mol / 0.116mol = 7 molecules of water.
The hydrate formula is:
MnSO₄.7H₂OSolubility is the-
1.ability of a solute to dissolve in a solvent
2.ability of substances to allow electrons to flow
3.ability of particles to disperse evenly into another substance
4.inability of particles to disperse evenly into another substance
Which one of these?
Al(s) +
Fe2O3(s)
Fe(s) + A1,0.3)
PER nuctives
Jenny read that most of Earth’s water is salt water, while only 3% is fresh water. She also read that not all of the fresh water is accessible. Most of Earth’s fresh water is tied up in which two areas?
A. glaciers and underground
B. ice and glaciers
C. underground and lakes
D. glaciers and lakes
Answer:
B. ice and glaciers
Explanation:
The majority of total freshwater on Earth, about 68.7 percent, is held in ice caps and glaciers.
There is 321 grams of H2SO4, how many molecules is this?
Answer:
The original number of oxygen atoms was about 80 times larger than Avogadro's number. Since each sulfuric acid molecule contains 4 oxygen atoms, there are about 20 moles of sulfuric acid molecules.
pls pls pls help me, this is a test and I have no clue what do to. pls pls I need answers fast!
Answer:
12. B
13. D
14. D
15. A
Explanation:
Plants respond to different kinds of stimuli. A plant's roots searching for water are an
example of what kind of response?
A. thigmotropism
B. phototropism
C. hydrotropism
D. gravitropism
Answer:
Explanation:
Hydrotropism
What's the name of the part of cells that sense molecules and other cells?
What mass of sodium hydroxide would be required to make 1.0L of a 0.75M solution of sodium hydroxide,
NaOH?
Given values are:
Volume, V = 1.0 L or, 1000 mLSolution, M = 0.75 MAs we know the relation,
→ [tex]M = \frac{W}{GM}\times \frac{1000}{V}[/tex]
or,
→ [tex]W = \frac{M\times GM\times V}{1000}[/tex]
By substituting the values, we get
[tex]= \frac{0.75\times 40\times 1000}{1000}[/tex]
[tex]= 30 \ g[/tex]
Thus the above response is right.
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hi please help, i will give 100 points
Explanation:
Boiling water:water heats up and bubbles physical change
Baking a cake: starts to cook into bread chemical change
Burning wood: turns into ash and burned wood chemical change
Painting a door: door changes color physical change
Answer:
water is yummy
Explanation:
1. Why do scientists study fossils? *
(25 Points)
O a to learn how the planet was formed
O b. to study how organisms changed over time
O c. to observe how drought affected the landscape
O d. to understand how weathering affect rock layers
help me with both number 8 and 9, I actually pressed commensalism for both of them, please be sure of your answer, first one to answer gets brainliest!
Answer:
8 is mutualism and 9 is commensalism
Explanation:
6. In photosynthesis, plants use carbon dioxide and water to
produce oxygen and glucose. How many grams of water are
needed to produce 75 grams of glucose?
6 CO2 + 6 H2O → C6H12O6 + 6 O2
a. 45grams
b. 90grams
c. 108 grams
d. 180grams
30 N
60 N
20 N
Net force:
Resulting force:
Answer:
Net force: 110 N
Resulting Force: 24.7289837 pounds-force
Explanation:
First you would add 30+60+20N which would be 110N
110N would equal to the 24.72898937 pounds of force.
When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?
Answer:
Explanation:
When a comet enters the solar system it curves towards the Sun due to the Sun's gravitational pull. Every celestial object in the universe has a gravitational pull whose force is dependent on the object's mass. The larger the object is the more gravitational pull it will have. The Sun is the largest object in our Solar system and therefore has the most gravitational pull. This is why the comet curves toward the Sun, but the opposite does not happen because the comet's gravitational pull is not strong enough to pull the Sun.
What ion does sodium (Na) form
Gold(III) forms an ionic compound with fluoride. How many atoms of each ion will bond to form an ionic compound?
Question 23 options:
1 gold(III), 1 fluoride
1 gold(III), 3 fluoride
2 gold(III), 3 fluoride
3 gold(III), 1 fluoride
Answer:
1 gold(III), 3 fluoride
Explanation:
PLEASE HELP ASAP I'LL MARK BRAINLIEST
Thank you :)
8. A meteor moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013.
Does this statement describe the meteor’s speed or velocity? 1pt
9. Why did you choose the answer above (explain why)? 1pt
Answer:
Its velocity was 7.8 km/s northward.
Explanation:
Because the meteor was only 45 m wide and was 27,700 km above Earth's surface it was not visible with the aid of a telescope.
The picture shows a diver constructing artificial reef in a shallow area of the ocean. artificial reef is intended to affect the ocean ecosystem by-
A. removing pollution from the water
B. Providing shelter for marine organisms
C. Causing sediment to erode into deeper waters
D. Preventing people from overfishing along the shore
Answer:
Everyone, the answer is actually B. Providing shelter for marine organisms
Explanation:
We just went over this question in class, this is the right answer. Causing sediment to erode in the waters just doesn't make any sense.
The materials which are used to construct artificial reefs includes rocks, wood, old tires, etc. The artificial reef affect the ocean ecosystem by providing shelter for marine organisms. The correct option is B.
What is an artificial reef?An artificial reef is defined as the manmade structure which may mimic some of the characteristics of the natural reef. The submerged shipwrecks are the most common form of artificial reef. The oil and gas platforms, bridges, etc. and other offshore structures are also function as artificial reefs.
From tourism to marine recreation and also for sport fishing, the reefs play an important role in local economies. They are also important for the health of the ocean and provides habitat for the variety of marine life and support the ocean ecosystems.
The artificial reefs are generally constructed to protect and enhance or restore the components of the marine ecosystems.
Thus the correct option is B.
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Solution A has a pH of 3, and solution B has a pH of 5. Which statement best
describes these solutions?
A. Solution B is more acidic than solution A
B. Solution A is acidic, and solution B is basic.
C. Solution B is less acidic than solution A.
O D. Solution A is basic, and solution B is acidic.
Answer:
The answer will be C
Explanation:
Solution A has a pH of 3, and solution B has a pH of 5 "Solution B is less acidic than solution A".
What is pH ?The chemical circumstances of such a solution are reflected by pH, which is an essential quantity. The pH might influence nutritional availability, biological functioning, microbial activity, as well as chemical behavior.
What is acidic?Acidic substances were characterized by a sour flavor. An acid is a molecule that can give an H+ ion while remaining energetically stable.
It is known that if pH ≥7 then solution will be acidic
Hence, solution B is less acidic than solution A.
Therefore, the correct answer will be option (C).
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(e)
Calculate the mass of one atom of sodium.
Use the equation:
relative atomic mass
mass of one atom of sodium =
Avogadro constant
Avogadro constant = 6.02 x 1023
Give your answer to 2 significant figures
Answer:
3.82 × 10 ^-23 g
Explanation:
6.02 x 10^23atoms = 1 mole of sodium
1 atom = 1/(6.02 x 10^23) mole
mass = mole × molar mass
= 1/(6.02 x 10^23) × 23
= 3.82 × 10 ^-23 g