Answer:
I think its it is A
Explanation:
Rust is red in colour, falls off in flakes, and forms when iron is wet. By process of elimination, it must be B.\
can i get brainly
someone help plz!
what is a Hydrogel?
Answer:
Hydrogels can be defined as systems comprising of three-dimensional, physically or chemically bonded polymer networks entrapping water in intermolecular space.
Explanation:
The first asteroid to be discovered is Ceres. It is the largest and most massive asteroid is
our solar system’s asteroid belt, having an estimated mass of 3.0 x 1021 kg and an orbital
speed of 17900 m/s. Determine the amount of kinetic energy possessed by Ceres.
Answer:
kinetic energy possessed by Ceres = 4.806 × 10^(29) J
Explanation:
We are given;
Estimated mass; m = 3 × 10^(21) kg
Orbital speed; v = 17900 m/s
Formula for kinetic energy is;
K.E = ½mv²
K.E = ½ × 3 × 10^(21) × 17900²
K.E = 4.806 × 10^(29) J
Thus;
kinetic energy possessed by Ceres = 4.806 × 10^(29) J
Can someone help me with this question.
I’ll mark brainliest
Answer:
sodium carbonate im pretty sure (the formula is Na2CO3)
Explanation:
hope this helps :))
A scientist is adding oxygen to iron in a chemical reaction to create rust. At what point during
this reaction will the oxygen and iron quit making rust?
Answer: What type of chemical reaction is rusting of iron?
Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.
Really need help with the rest of them, please it's due in 20 minutes
Answer:
chlorine is for pool
Explanation:
hope is help
Combustion engines became common in the mid-1800s when people began to use them to power ships, trains, and
machinery in factories. Combustion engines add carbon dioxide to the air, and as a result, carbon dioxide in the
atmosphere increased quickly. How did this change the total amount of energy in the Earth system, and how did this
change happen? How did this affect global average temperature?
I need help please and don’t send the fake link): < just to get points
Answer:
The correct answer is - increased the global average temperature.
Explanation:
Combustion is the process that increases the carbon dioxide in the atmosphere, which results in entering more energy into the Earth system than existed from it. Therefore, the amount of energy increased in the system of the earth or surface of the earth.
The reason behind it is that carbon dioxide trapped and redirects energy back toward the Earth's surface, which is absorbed by Earth's surface and surface increased, and global average temperature increased.
Combustion process increases the global average temperature of the earth by absorbing and emitting the energy revert back to earth.
What is combustion?Combustion is a process exothermic process in which organic molecules burns in the presence of oxygen to produce energy in the form of heat and light and CO₂ gas.
CO₂ gas is a green house gas which traps the energy of the atmosphere and revert back it into the earth surface, due to which temperature of the earth surface and atmosphere increases which results in the elevation of global average temperature.
Hence, combustion increases the global average temperature.
To know more about combustion, visit the below link:
https://brainly.com/question/15246277
NEED HELP!! What types of waves are transmitted from the H-E-L-P device ?
Answer:
What do you mean need more details
Explanation:
Since a help device is a a communication gadget, we know that the help device will make use of radio waves.
What is a help device?A help device refers to a device that can be used for emergency communication. They are basically communication gadgets.
We must note that our communication gadgets such as television, radio, cell phone etc all make use of radio waves. Hence a help device would make use of radio waves.
Learn more about radio waves: https://brainly.com/question/3393755?
Commercially available cold packs are simple in design: a pouch with water on one side, isolated by a barrier from a specific salt on the other side. When the barrier is broken, the salt and water mix and the solution turns cold. Select which of the statements is true about the reaction occurring in cold packs. O The reaction between the salt and water is endothermic. O The reaction between the salt and water is exothermic. O The reaction between the salt and water is neither endothermic nor exothermic. The cold pack releases heat into the environment. #8
Answer:
The reaction between the salt and water is endothermic.
Explanation:
The reaction is endothermic because the reaction absorbs heat and causes the surroundings to become cooler.
2Fe(OH)3 Fe2O3+3H2O how many grams of Fe2O3 are produced if 10.7 grams of Fe (OH)3 react in this way
Answer: 7.98 grams of [tex]Fe_2O_3[/tex] are produced if 10.7 grams of [tex]Fe(OH)_3[/tex] are reacted.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Putting values in equation 1, we get:
[tex]\text{Moles of} Fe(OH)_3=\frac{10.7g}{106.87g/mol}=0.100mol[/tex]
The chemical equation for the reaction is
[tex]2Fe(OH)_3\rightarrow Fe_2O_3+3H_2O[/tex]
By Stoichiometry of the reaction:
2 moles of [tex]Fe(OH)_3[/tex] produce = 1 mole of [tex]Fe_2O_3[/tex]
So, 0.100 moles of [tex]Fe(OH)_3[/tex] produce= [tex]\frac{1}{2}\times 0.100=0.05mol[/tex] of [tex]Fe_2O_3[/tex]
Mass of [tex]Fe_2O_3[/tex] =[tex]moles\times {\text{Molar Mass}}=0.05mol\times 159.69g/mol=7.98g[/tex]
Hence 7.98 grams of [tex]Fe_2O_3[/tex] are produced if 10.7 grams of [tex]Fe(OH)_3[/tex] are reacted.
and a 40N Torce in a southeriy direction?
4. A car works harder to accelerate from 0 to 10km/hr than it does to maintain a 10km/hr speed. Why is this? A. b/c
static friction is harder to overcome than kinetic or rolling friction. B. b/c static friction is easier to overcome than
kinetic or rolling friction. C. b/c static friction is harder to overcome than potential energy. D. b/c static friction is
easier to overcome than gravity.
Answer:
C.
Explanation: because potential energy is the starting point before it moves. nothing has to be done.
The ability of a match to burn is an example of a physical property.
Answer:
true
Explanation:
what is a dehydrate in chemistry?
Answer:
hydrate agen
Answer:
In chemistry, a dehydration reaction is a conversion that involves the loss of water from the reacting molecule or ion.
Dehydration reactions are common processes, the reverse of a hydration reaction.
Common dehydrating agents used in organic synthesis include sulfuric acid and alumina.
Explanation:
good luck
2NaCl ---> 2Na + Cl2
What are the atoms of the products
Answer: ...
Explanation:
Sodium, chlorine
Answer:
2Na = 2 Sodium [has 2 atoms]
Cl2 = Dichlorine (Chlorine) [has 2 atoms]
Is this what you wanted?? I'm not entirely sure if this is the answer you were looking for.
Element X is a solid at room temperature.
It needs one electron per atom to gain the electronic structure of a noble gas.
It is the least reactive element in its group.
What is the element X?
1.At
2.Cs
3. F
4. Li
Answer:
Element X is Cs or cesium
WILL GIVE THE BRAINLIEST
in the reaction 2CO(g) +O2(g)------> 2CO2(g) vwhat is the ratio of moles of CO used to moles O2 used?
Answer:
Oxygen: Carbon Dioxide
O2:2CO2
1:2
A 2.5-liter sample of a gas has 0.30 mole of the gas. If 0.15 mole of the gas is added, what is the final volume of the gas? Temperature and pressure remain constant.
Answer:
1.125
Explanation:
I think it is his because if you add 0.30 and 0.15 it adds up to 0.45 so you just multiply 0.45 and 2.5 and then it gives you 1.125. HOPE IT HELPS.
. If 30.0 grams of copper (II) chloride reacts with 40.0 grams of sodium nitrate, what is the limiting reactant?
Answer:
The limiting reactant is copper (II) chloride
Explanation:
here you go
Please help!! I have 10 minutes left!!
Answer:
I believe it is hydrogen for the first and methane for the second.
Explanation:
Answer to 8: The most dangerous or harmful gas to humans in the atmosphere would be carbon dioxide. But reserchers have found that methane levels in ancient air samples and found that scientists have been vastly underestimating the amount of methane humans are emitting into the atmosphere via fossil fuels.
Answer to 7: The type of gases present are as critical to density as elevation and gravity, and all are interrelated. Certain atmospheric gases will create thick atmospheres. For example, atmospheres with abundant hydrogen tend to be thicker as gases will combine with hydrogen for greater mass.
Hope this helps!
What is the speed of a wave on a guitar string with a mass of
0.5 kg, if it takes 0.2 seconds for the wave to travel down the
0.9 m string.
Answer: 4.5
Explanation:
How many grams in 4.50 moles of NaNO3?
Answer:
382.5 grams
Explanation:
Find the molar mass of NaNO₃ and then multiply the number of moles by that molar mass :)
What is a solution?
a
a homogeneous mixture with particles between .01 and 1 nm
b
a homogeneous mixture with particles smaller than .01nm
c
a heterogeneous mixture with particles between .01 and 1 nm
d
a heterogeneous mixture with particles smaller than .01nm
Harold’s car has a fuel efficiency of 35 miles per gallon. Frank’s car has a fuel efficiency of 12 kilometers per liter. Who gets better gas milage, Harold or Frank?
Answer: Harold car has better mileage
Explanation: US gallon is 3.785 litres and one mile is 1.6 km.
35 · 1.6 km/ 3.785 l = 14.8 km/l
The Harold's car has a fuel efficiency of 35 miles per gallon and has better gas mileage.
What is efficiency?The efficiency is defined as the peak level of performance that uses the least amount inputs to achieve the highest amount of output.
Effectiveness is the ability to produce a better result, one that delivers more value or achieves a better outcome.
Efficiency is expressed as
Efficiency = output / input
The mileage of Harold's can be calculated as:
US gallon has 3.785 liters and 1 mile is 1.6 km
Thus mileage = 35 x 1.6 km / 3.785 l
= 14.8 km/l
Mileage of Frank's car = 12 x 1.6 km / 3.785 l
= 5.07 km/l
Thus, the Harold's car has a fuel efficiency of 35 miles per gallon and has better gas mileage.
To learn more about efficiency, refer to the link below:
https://brainly.com/question/13828557
#SPJ2
Balance the following:
Answer:
[tex]Na_3PO_4+Al(OH)_3\rightarrow3NaOH+AlPO_4[/tex]
what is one way that fish interact with a coral reef
Answer:
The second answer. Fish hide within the coral. Hope this helps!!!!
Describe the skier function of the law of conservation of energy
Answer:
Energy can't be created nor destroyed but it can be transformed
Explanation:
What would happen to an impulse if a neuron cannot produce chemicals at a synapse?
Answer:
Explanation: he axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron. ... The binding allows the nerve impulse to travel through the receiving neuron
The nucleus of an atom is positively charged
Answer:
It's because of the presence of protons.
Explanation:
A nucleus of an atom has protons and neutrons. We know that a proton has a charge of
+
1
, while a neutron has no charge, or
0
. Therefore, the nucleus of an atom will always have a positive charge.
Which is not a physical state of matter?
A. Solid
B. Liquid
C. Plasma
D. Gas
Answer: Plasma
Explanation:
Answer: Plasma
Explanation:
Si desea preparar 300 gramos de una solución de azúcar en agua que tenga una concentración de 20% m/m en cuanto gramos de soluto de azúcar se necesita?
Answer:
[tex]m_{soluto}=60g[/tex]
Explanation:
¡Hola!
En este caso, al considerar la unidad de concentración de porcentaje masa/masa, podemos escribir su fórmula como:
[tex]\%m/m=\frac{m_{soluto}}{m_{solucion}}*100\%[/tex]
Podemos identificar la masa de soluto (azúcar) como la incógnita, y resolverla como se muestra a continuación:
[tex]m_{soluto}=\frac{\%m/m*m_{solucion}}{100\%}\\\\m_{soluto}=\frac{20\%*300g}{100\%}\\\\m_{soluto}=60g[/tex]
¡Saludos!
Compare and contrast a driver of a car and truck, and list defensive driving no links
Answer:
These defensive driving skills can help you avoid the dangers caused by other ... being aware of the cars around you, checking your mirrors — the list goes on. ... It's not just teen drivers who are at fault: People who have been driving for a while ... car and a slow-moving truck in the same lane, it's a pretty sure bet the driver ...
Explanation:
