Read the list of elements given below.
F, Cl, Br, I
Which of the following about the elements is true?
A. All of them are highly reactive metals
B. All of them are highly reactive nonmetals
C. F and Cl are reactive nonmetals and Br and I are highly reactive metals
D. F and Cl are reactive metals and Br and I are highly reactive nonmetals
need done ASAP HELP MEEE
Answer:
1. Heat
2. Temperature
3. convection
4. Conduction
5. Radiation
Before we can analyze the alum crystal it is
necessary to remove any impurities or
uncrystallized ions that may be present in the
sample. Alcohol must be used because alum
is water soluble.
Answer: TRUE
Explanation:
I need help with 4, 5, 8, 9, and 6. Quickly I need it before class starts. Worth points!!!!!! HelP
Answer:
4. 264.6J
5. 37.5J
6. 96J
7. 55Watts
8. 77.14m
9. 6s
10. 750Watts
Explanation:
4). Mechanical energy (potential energy) = mass (m) × acceleration due to gravity (g) × height (h)
m = 3kg, h = 9m, g = 9.8m/s²
P.E = 3 × 9 × 9.8
= 264.6J
5). Kinetic energy (K.E) = 1/2 × m × v²
Where;
m = mass (kg) = 3kg
v = velocity (m/s) = 5m/s
K.E = 1/2 × 3 × 5²
K.E = 1/2 × 3 × 25
K.E = 1/2 × 75
K.E = 37.5J
6). Work done (J) = Force (N) × distance (m)
Force = 12N, distance = 8m
Work done = 12 × 8
= 96J
7). Power = work done (J) ÷ time (s)
Work done = 550J, time = 10s
Power = 550/10
= 55Watts.
8). Work done = force (F) × distance (m)
Work done = 540J, force = 7N, distance = ?
540 = 7 × d
540 = 7d
d = 540/7
d = 77.14m
9). Power = work done (J) ÷ time (s)
Work done = 300J, time = ?, Power = 50Watts.
50 = 300/t
50t = 300
t = 300/50
t = 6seconds.
10). Power = work done (J) ÷ time (s)
This means that;
Power = force × distance / time
Force = 300N, distance = 5m, time = 2s
Power = 300 × 5 ÷ 2
Power = 1500 ÷ 2
Power = 750Watts
Which chemical reaction below demonstrates the combustion of a hydrocarbon?
****I RLY NEED HELP RN!!! ITS CHEMISTRY AND I AM SOOOO LOST. CAN SOMEONE PLZ PLZ PLZ HELP A GIRL OUT??? I WILL MARK BRAINLIEST, ETC!!!!!
Balance the following chemical equations:
1) AgNO3 + KCl AgCl + KNO3
2) H2O + SO3 H2SO4
3) KI + Cl2 KCl + I2
4) NaHCO3 Na2CO3 + H2O + CO2
5) Zn + HCl ZnCl2 + H2
6) BaCl2 + Na2SO4 BaSO4 + NaCl
Answer:
Explanation:
1. AgNO3 + KCl = AgCl + KNO3
2. SO3 + H2O = H2SO4
3. 2 KI + Cl2 = 2 KCl + I2
4. 2 NaHCO3 = Na2CO3 + CO2 + H2O
5. Zn + 2 HCl = ZnCl2 + H2
6. BaCl2 + Na2SO4 = BaSO4 + 2 NaCl
Answer:
oh no
Explanation:
I would help but I have no clue!!!
I'm so sorry.
PLEASE ANSWER IF ITS CORRECT I WILL MARK IT AS BRAINLIEST PLZ??
What do you think would happen if the temperature of a gas is higher than the other when applying Graham's Law? *
A) There will be no effect on the gas
B) The kinetic energy of the gas particles would increase
C) The volume of the gas particles would increase
Answer:
There will not be effect on the gas
Explanation:
I'm sure that it's correct answer
Drag each tile to the correct location.
Classify the elements as diatomic or monatomic. If necessary, refer to the periodic table to help you identify the diatomic elements.
Answer:
Carbon, helium, and sodium are monoatomic elements.
Hydrogen, iodine, and oxygen are diatomic elements.
Explanation:
Which of Earth's five spheres is involved when a volcano erupts?
Answer:
[;
Explanation:
Mudflows (geosphere) and flooding may occur downstream from volcanoes and may inundate streamside communities (biosphere).
How many grams of hydrogen gas are produced if 3.0 moles of magnesium are reacted with excess hydrochloric acid?
Answer k
Explanation: better luck
what is the molar mass of Mg(NO2)2?
Answer:
116g/mol
Explanation:
Mg=24
NO2=46
multiple 46 by 2and then add 24
The molar mass of Mg(NO₂)₂ is 116.33 g/mol.
To calculate the molar mass of Mg(NO2)2, we need to determine the atomic masses of each element in the compound and multiply them by their respective subscripts.
The atomic masses of the elements involved are:
Mg (magnesium) = 24.31 g/mol
N (nitrogen) = 14.01 g/mol
O (oxygen) = 16.00 g/mol
The compound Mg(NO₂)₂ contains one magnesium atom (Mg), two nitrate ions (NO₂), and each nitrate ion contains one nitrogen atom (N) and two oxygen atoms (O).
Molar mass of Mg(NO₂)₂ :
Mg: 1 × 24.31 g/mol = 24.31 g/mol
N: 2 × 14.01 g/mol = 28.02 g/mol
O: 4 × 16.00 g/mol = 64.00 g/mol
Now, add up the individual masses:
24.31 g/mol + 28.02 g/mol + 64.00 g/mol = 116.33 g/mol
Therefore, the molar mass of Mg(NO₂)₂ is 116.33 g/mol.
Learn more about molar mass here:
https://brainly.com/question/31545539
#SPJ 6
How many grams of KCl are produced if 90 g KCIO3 decomposes? *
54.75 g KCI
13.69 g KCI
27.37 g KCI
37 g KCI
What is the relationship between air pressure, density, and altitude?
Answer:
''The relationship between air pressure, air density, or altitude? As altitude increases, pressure increases. As altitude increases, air density increases. Air pressure and density are lowest at sea level.''
Explanation:
A student is doing an investigation on the movement of objects.
Why is it important for her to repeat the investigation several times?
Why LED is better option for testing the conduction of electricity?
Answer:
Led is a light-emitting diode, a semiconductor diode that glows when a voltage is applied. So, there is always a sure result of whether a substance conducts electricity or not as the light glows. That is why it is a better option for testing conduction of electricity.
Explanation:
Which of the following are behavioral adaptations? Select all that apply.
A. playing dead
B. migration
C. type of teeth
D. hibernation
E. body coverings
Answer:
The 2 types of behavioral adaptation are migration, and hibernation. Explanation: Adaptation of animal is the fitness towards its environment.
Explanation:
write difference between metallic and non metallic minerals
Metallic Minerals will be minerals in which metal components are available in their crude structure. Non-metallic minerals don't contain any metal substances in them. At the point when metallic minerals are dissolved another item is shaped. Non-metallic minerals are frequently discovered installed in youthful overlay mountains and sedimentary rocks.
Learning Task 4: Read the instructions found on the next page. Answer the
questions. Write your answers in your answer sheet..
Answer:
1. yes because it wants to go back to its original spot.
2. the poetical energy turns into kenotic energy and then moves back to the original position
3. it will go back to the original position just different angle
4. same thing as last time goes back to the original position but different angle because of how you are holding the ruler.
Explanation:
Pls help if you’re good at science I’ll mark brainliest <3
Answer:
B. Extrusive Igneous rock
In what situation does water undergo a physical change?
Answer:
There are actually two.
Explanation:
When water freezes it turns to ice however it still has the molecular properties of water. Same thing when it evaporates.
calculate how many seconds are in the month of april
A skateboarder coasts a distance of 20 meters in 4 seconds. What is the person's speed?
Answer:
5
Explanation:
20/4
well i just had a major PTSD attack how is everyone i need to think about something else
Answer:
Oh so so sorry about that. and thanks for caring for us. anyway we are good wbu
Explanation:
im good. i just ate applesauce lol :)
Which is correct ? I’m really confused
Answer:
A. Florine has a stronger pull than Magnesium
Explanation:
Electronegativity refers to the tendency in which an tom would attract electrons to itself.
Below each element in the periodic table is their electronegativity value. Florine has the highest electronegativity value of 4.0.
Going through options;
A. Florine has a stronger pull than Magnesium
Florine = 4.0
Magnesium = 1.2
This correct
B. Hydrogen has a stronger pull than Phosphorus
Hydrogen = 2.1
Phosphorus = 2.1
This is wrong
C. Potassium has a stronger pull than Sodium
Potassium = 0.8
Sodium = 0.9
This is wrong
D. Iron has a stronger pull than Bromine
Iron = 1.8
Bromine = 2.8
This is wrong
The 2s orbital is at n=2. *
True
False
Answer:
Try true
Explanation:
But note I'm not sure
Explanation:
it is true
hope I helped you!! :))
If I have 3.45 x 1024 molecules of sucrose, how many moles of sucrose do I have?
Answer:
3532.8
Explanation:
which of the following elements has the largest first ionization energy? PLEASE HELP
Answer:
Boron
Explanation:
Hope it helps you......
Answer:
B. Nitrogen
&
D . Boron
Explanation:
both are the element has the largest first ionization energy
How does real-world military CIS compare to its portrayal on television? You can either refer to the agent speaking about it in the video or draw your own conclusions from the video against things you’ve seen on television.
Answer: The video compared to things i've seen on TV seems much more stressful. On TV, they always seem pretty confident in what they are doing, but it never shows the training and how much work you have to go through to get to the end result. They always just take their time walking around and do lots of talking in TV shows when that's not the case at all in this video. It's get in and get out with as much evidence as possible. The TV show always has a successful ending when the hour ends, which is not the case in real life.
In which or areas on the image dose salinity of the ocean increases
A.1
B.2
C.3
D.1,2,3
E.none of these
Answer and Explanation:
D I believe..
Answer: The saltiest locations in the ocean are the regions where evaporation is highest or in large bodies of water where there is no outlet into the ocean. The saltiest ocean water is in the Red Sea and in the Persian Gulf region (around 40‰) due to very high evaporation and little fresh water inflow.
Explanation: Sea water salinity is expressed as a ratio of salt (in grams) to liter of water. In sea water there is typically close to 35 grams of dissolved salts in each liter. It is written as 35‰ The normal range of ocean salinity ranges between 33-37 grams per liter (33‰ - 37‰).But as in weather, where there are areas of high and low pressure, there are areas of high and low salinity. Of the five ocean basins, the Atlantic Ocean is the saltiest. On average, there is a distinct decrease of salinity near the equator and at both poles, although for different reasons.Near the equator, the tropics receive the most rain on a consistent basis. As a result, the fresh water falling into the ocean helps decrease the salinity of the surface water in that region. As one move toward the poles, the region of rain decreases and with less rain and more sunshine, evaporation increases.Fresh water, in the form of water vapor, moves from the ocean to the atmosphere through evaporation causing the higher salinity. Toward the poles, fresh water from melting ice decreases the surface salinity once again. Water has a unique property. As the temperature decreases to 40°F (4°C) the molecules slow, water contracts and the density increases. Below 40°F (4°C) the molecules begin to bond to each other and as they do, the water begins to expand again, decreasing the density. At 32°F (0°C) all molecules are locked into a crystalline structure with a resulting nine percent expansion in size. This expansion, and corresponding decrease in density, is the reason ice floats. The amount of salt in sea water also determines the temperature at which sea water freezes. Adding salt to water lowers the freezing temperature. Water with a salinity of 17‰ freezes at about 30°F (-1°C) and 35‰ water freezes at about 28.5°F (-2°C). Yet, despite the saltiness of the ocean, sea ice contains very little salt, about a tenth of the amount of salt that sea water has. This is because ice will not incorporate sea salt into its crystal structure. Therefore, sea ice is actually drinkable. The temperature and salinity of the sea water also help determine its density. As the temperature of sea water decreases the density also increases. Also, as the salt content of sea water increases, so does its density. This makes the density of sea water, unlike fresh water, below the freezing point. So, in situations of sea ice formation, the salinity, and therefore the density of the underlying water continues to increase well after an area is iced over.
In the "Average Salinity" map (below), it shows the lowest salinity in the polar regions. Bear in mind, this image depicts surface salinity only. The surface salinity is lower in the polar regions than in the tropical regions due to melting each summer. However, each winter below the ocean surface, the increased salinity in the water due to ice formation, causes the water below the ice to sink and that sinking motion governs the motion of the ocean's deep-water currents.
Write the chemical formula of the following:
(1) Calcium hydroxide.
(2) Magnesium hydroxide.
(3) Aluminum sulphate.
(4) Sodium carbonate.
(5) Zinc phosphate.
(6) Lithium nitrate.
(7) Copper carbonate.
(8) Potassium carbonate.
(9) Magnesium sulphate.
(10) Calcium phosphate.
Answer:
1.Ca(OH)2
2.Mg(OH)2
3.Al2SO4
4.Na2CO3
5.Zn3(PO4)2
6.LiNO3
7.CuCO3
8. K2CO3
9.MgSO4
10.Ca3(PO4)2
