Answer:
3
Explanation:
0's aren't one of the significant figures. so it would just be 3.
Hope this helps!!!
Answer:
3
Explanation:
In multiplication you count the least amount of significant figures. All digits other than leading 0's. If zeros are after, they count as significant.
Identify any solutes and solvents present in a mixture of 0.05 mol ethanol, 1 liter water, and 0.2 g hydrogen
peroxide.
Answer:
Water is the solvent
Both the ethanol and the hydrogen peroxide are the solute
Explanation:
Both the hydrogen peroxide and ethanol are sisobable in water.
There are 0.05 moles of ethanol.
1 litreof water contains 55.55 moles of water.
0.2 g of hydrogen peroxide contains 0.2/34 = 0.0059 moles of hydrogen peroxide (the 34 is the molar mass of hydrogen peroxide).
Since there are more moles of water, water becomes the solvent and the other two liquids dissolve in it.
Gasoline is used to power most of the cars in the United States and worldwide. The average fuel economy for a gasoline powered car is about 32 miles per gallon. The average car in the U.S. Is driven about 15 000 miles (24 000 kilometers) per year. Calculate the number of gallons of gasoline that are combusted by the average car in the U.S. Each year.
Answer:
469 gallons
Explanation:
From the question given, we were told that:
For every 32 miles, 1 gallon of gasoline is consumed.
With the above information, we can obtain the number of gallon of gasoline consumed by a car per year i.e 15000 miles
This is illustrated below:
If 32 miles consumed 1 gallon of gasoline,
Therefore, 15000 miles will consume = 15000/32 ≈ 469 gallons of gasoline.
Therefore, 469 gallons of gasoline is consumed by the average car each year
The
Test
Active
TIME REMAINING
01:44:31
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Which planets are terrestrial? Select three options.
Jupiter
Mars
Mercury
Uranus
Venus
Mark this and retum
Save and Exit
Nex
Answer:
mercury, mars, venus
Explanation:
How would you solve this?
"Calculate the amount of energy transferred if only 650.50 grams of sulfur trioxide (SO3) gas were produced. (Remember the ∆H = -396.8 kJ is part of the balanced equation)"
balanced equation: 2 SO2 (g) + O2(g) ⇌ 2 SO3 (g) ∆H = -396.8 kJ
Answer:
1.6×10^3 KJ
Explanation:
We must first calculate the number of moles corresponding to 650.50g of sulphur trioxide.
Number of moles = mass of sulphur trioxide/ molar mass of sulphur trioxide
Molar mass of sulphur trioxide= 80.066 g/mol
Given mass of sulphur trioxide= 650.50g
Number of moles = 650.50g / 80.066 g/mol
Number of moles = 8.124 moles of sulphur trioxide
Now from the balanced reaction equation;
Formation of 2 moles of sulphur trioxide evolves 396.8KJ of energy.
Therefore formation of 8.124 moles of sulphur trioxide will evolve;
8.124moles × 396.8 KJ /2 moles = 1611.8KJ or 1.6×10^3 KJ
What is the form of the Pythagorean triple generator?
A. (x?+y?j* = (?-y? j* -(2xy)"
O B. (x2+y?(x2 - y?j* +(2xy)?
O C. (x2 - y2)* (*? +y?y* - (2xy)?
O D. (x2 + y2)%= (+?]+(203)
In this group, which percentage does the green seed
represent?
25%
50%
75%
100%
Answer:
ITS A 25% trust me
Answer:
I think it is 25%
Explanation:
A yellow solution of iodine in water is shaken with an equal volume of tetrachloromethane describe and explain what happens
Answer:
See the answer below
Explanation:
When a solution of iodine is mixed with a solution of tetrachloromethane, the mixture turns purple due to the formation of [tex]I_2(CCl_4)[/tex].
Iodine solution dissolves in carbon tetrachloride solution (another name for tetrachloromethane) due to the fact that both solutions are similarly non polar in nature. The equation of the reaction is as shown below:
[tex]I_2 + CCl_4 --> I_2(CCl_4)[/tex]
barium + aluminum nitrate
Answer:
Al2SO43 + 3 BaNO32 = 3 BaSO4 + 2 AlNO33
Explanation:
Which compounds are electrolytes
Answer:
Calcium.
Potassium.
Chlorine.
Magnesium.
Sodium.
Phosphate.
Explanation:
true or false applied chemistry does not have a specific goal or application
Answer:
False. The goal of chemistry is to accumulate knowledge. Sometimes true. Biochemistry involves ... Sometimes true. Applied Chemistry is used to attain specific goals ... Applied Chemistry.
Explanation:
I really hope this helped :)
Identical twins are born with black hair. They grow up together as children, but as adults they live far apart and lead very different lives. How do you explain why one of the twin's black hair turns gray over time?
Answer:
Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. ... As identical twins get older they may look more and more different, because they are exposed to more diverse environments. The science of epigenetics explains how these environmental influences can affect the genes.
hope this is helpful!
The color changes occurs in hair might caused by life styles and diet irrespective of the genetical traits. The damaged pigment cells causes the gray hair.
What are genetic traits ?Each characteristics in a living thing is coded by genes in them. These codes corresponding to some behaviors are called genetic traits. The pigment melamine make the hair black.
Variation in the pigment makes the color variation in hair also. Gray hair may appear on anyone at any age. Some people begin to go grey as early as when they are in high school or college.
Our genes decide when we begin to grey our hair. That a result, the majority of us will start ageing at around the same time as our parents or grandparents did.
However, our lifestyle and diet also influence the hair and skin color. Therefore, there might have differences in appearance of twins too.
Find more on genetic traits:
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give two sources of energy that can cause ocean waves
Explanation:
Thermal energy from the sun's heat, and mechanical energy from previous tides and waves. Oceans are one of the largest solar collectors.
If 50g of calcium carbonate is heated, what mass of calcium oxide is formed
Answer:
22 g of CO2 are obtained from decomposition of 50 g of CaCO3
Explanation:
An object becomes positively charged when it
Answer:
When electrons are removed from an object, it becomes positively charged
An electrical charge is created when electrons are transferred to or removed from an object. Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged.
please answer these about Charles law
Answer:
1. V2.
2. 299K.
3. 451K
4. 0.25 x 451 = V2 x 299
Explanation:
1. The data obtained from the question include:
Initial volume (V1) = 0.25mL
Initial temperature (T1) = 26°C
Final temperature (T2) = 178°C
Final volume (V2) =.?
2. Conversion from celsius to Kelvin temperature.
T(K) = T (°C) + 273
Initial temperature (T1) = 26°C
Initial temperature (T1) = 26°C + 273 = 299K
3. Conversion from celsius to Kelvin temperature.
T(K) = T (°C) + 273
Final temperature (T2) = 178°C
Final temperature (T1) = 178°C + 273 = 451K
4. Initial volume (V1) = 0.25mL
Initial temperature (T1) = 299K
Final temperature (T2) = 451K
Final volume (V2) =.?
V1 x T2 = V2 x T1
0.25 x 451 = V2 x 299
Is the earth older than any of the rock layers.
Yes, the Earth is Older than most of the Rock Layers.
About 6,000 years ago God created light to divide the darkness. The next day created the atmosphere and the oceans so there was no land yet. But on the next day he created the land that divided the water and vegetation was created.
These are true facts from Genesis 1
Extra Stoichiometry Practice
1. How many grams of aluminum oxide can be formed by the reaction of 38.8 g of aluminum with
oxygen?
4 Al (8) + 3 O2(g) →2 A12O(s)
Answer: 50. 4g
Explanation:
First calculate number of moles of aluminium in 38.8g
Moles = 38.8g/ 26.982mol/g
= 1.44mol
By looking at the balance equation you can see that 4 moles of aluminium produce 2 moles of aluminium oxide.
4 = 2
1.4 = x
Find the value of x
x= (1.4×2)/4= 0.72 mol
0.72 moles of aluminium oxide are produced from 38.8g of aluminium
Now find the mass of aluminium produced.
Mass = moles × molar mass
= 0.72mol × 69.93 mol/g
= 50.4g
***WORTH 25 POINTS****
What 2 processes change sedimentary rock into igneous rock? (has to become magma first) _________ & _____________.
Answer:
Explanation:
The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock.
Igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals. The minerals can form crystals when they cool. Igneous rock can form underground, where the magma cools slowly. Or, igneous rock can form above ground, where the magma cools quickly. idk if this helped*
How explain two ways to decrease the energy of a wave
Answer:
gravity that's what I rellat think it is
PLEASE HELP ME WITH THIS
Answer:
I guess B
Explanation:
Answer:
The answer is D
Explanation:
how is the flow of radiant energy impacted by tectonic events
Answer:
Tectonic activity also causes volcanoes to erupt and occurs when plates bombard each other or when they are pulled apart. Once they erupt, they can alter the energy flow of the Earth. ... These particles have a cooling effect on the planet as they reflect the incoming solar radiation.
Explanation:
Answer:
The first person answer is correct
How does mass defect relate to binding energy in the nucleus?
A.They both represent uncertainty in mass and energy measurements.
B. The mass defect represents the mass converted to binding energy
C. The binding energy replaces the missing mass during a reaction
D. The mass defect and the binding energy measure weak nuclear forces
Answer:
B. The mass defect represents the mass converted to binding energy.
Explanation:
I just took a quiz on a pe x and it was correct! :)
Relation of mass defect to binding energy in the nucleus expresses by the statement that the mass defect represents the mass converted to binding energy.
What is mass defect?Mass defect is the difference in the mass which is obtained by the difference between the total mass of nucleus and sum of the mass of the constituent particles of nucleus.
Binding energy is the amount of energy which is released dueing the formation of the nucleus of any any element and this energy is released because of the presence of the mass defect of nucleus.
Binding energy is directly proportional to the mass defect and calculated as:
B.E. = mc, where
m = mass defect
c = speed of light
Hence, mass defect represents the mass converted to binding energy.
To know more about mass defect, visit the below link:
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what are the typical properties of a group 1 metal
Answer:
The group 1 elements are all soft, reactive metals with low melting points. They react with water to produce an alkaline metal hydroxide solution and hydrogen.
Explanation:
Given the equation representing a chemical reaction at equilibrium in a sealed, rigid container:when the concentration of h2(g) is increased by adding more hydrogen gas to the container at constant temperature, the equilibrium shifts
Answer:
The equilibrium shifts to the right, shifting towards the products, thereby favouring forward reaction, leading to the production of more product (NH₃) and a reduction in the rate of backward reaction, resulting in a decrease in the production of reactant N₂ in the reaction.
Explanation:
Complete Question
Given the equation representing a chemical reaction at equilibrium in a sealed, rigid container:
N₂ (g) + H₂ (g) ⇌ NH₃ (g)
When the concentration of H₂(g) is increased by adding more hydrogen gas to the container at constant temperature, the equilibrium shifts
Solution
Le Chatelier's Principle explains the behaviour of the equilibrium in response to disturbances in properties for chemical reactions.
The principle states that, if the concentration, temperature and/or pressure of a chemical reaction at equilibrium is changed, the equilibrium position shifts to remedy this changes.
So, for a chemical reaction at equilibrium, provided that the other factors such as temperature and pressure remain constant, if more reactants are added (more H₂ is pumped into the reacting container), the equilibrium responds by shifting to the right, shifting towards the products, thereby favouring forward reaction, leading to the production of more product (NH₃) and a reduction in the rate of backward reaction, resulting in a decrease in the production of reactant N₂ in the reaction.
Hope this Helps!!!
What is the total number of hydrogen atoms in a molecule of heptyne?
Answer:
12
Explanation:
alkyne formula is CnH2n-2
heptyne = 7
The total number of hydrogen atoms in a molecule of heptyne is twelve (12).
What is heptyne?Heptyne belong to alkyne family with one triple bond and the molecular formula can be determined as follows;
CₙH2ₙ-2
Heptyne contains 7 carbons
C7H[2x 7 - 2] = C7H12
Thus, we can conclude that, the total number of hydrogen atoms in a molecule of heptyne is twelve-12.
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Na2S2O3(aq) + HCl(aq) → S(s) + SO2(g) +
_NaCl(aq) + H2O(1)
A.6
B. 7
C. 8
D.9
WILL BE AWARDED BRAINLIEST
a _ is a push or pull
Answer:
force
Explanation:
Answer:
what dose this mean "_" is there an image that could help?
At midday (12pm, Noon), what is happening in the leaf of a plant?
A) Cellular Respiration
B) Photosynthesis
C) Mainly photosynthesis and some cellular respiration
D) None of the above
Answer:
C
Explanation:
Noon is the peak amount of sun shining. Therefore the plant will be carrying out a lot of photosynthesis using the light. Cellular respiration happens regularly as well
At midday, what is happening in the leaf of a plant would be photosynthesis and cellular respiration. The correct option would, therefore, be C.
Photosynthesis has two reactions:
Light dependent reactionLight independent reactionThe light dependent reaction is rate determining step of photosynthesis. Hence, photosynthesis proceeds at normal rate during the day.
Cellular respiration, on the other hand, takes place with or without light.
Hence, at 12 pm, Noon, both photosynthesis and cellular respiration will be taking place simultaneously in the leaf of plants.
More on photosynthesis and cellular respiration can be found here: https://brainly.com/question/18728019
When you add salt to water it makes the solution boil
A. faster.
B. at a lower temperature.
C. at a higher temperature.
D. slower.
Answer:
A i believe
Explanation:
4.1 kg of a plastic, used to make plastic bottles, has a carbon footprint of 6.0 kg of carbon dioxide.
Calculate the carbon footprint of one plastic bottle of mass 23.5 g
Answer:
The carbon footprint of one plastic bottle of mass 23.5 g is 34.390 g.
Explanation:
The carbon footprint of one plastic bottle can be estimated by simple rule of three. That is:
[tex]x = \frac{23.5\,g}{4100\,g}\times 6000\,g[/tex]
[tex]x = 34.390\,g[/tex]
The carbon footprint of one plastic bottle of mass 23.5 g is 34.390 g.