PLEASE HELP ME ASAP DUE IN 30 MINUTES !!!!!!!!!!!!

4. A student performed an experiment to determine the density of a sugar solution and obtainedthe following results: 1.24 g/mL, 1.21 g/mL, 1.23 g/mL.The actual density is 1.50 g/mL. Circle the correct value for the average, X, in the first column and for the accuracy evaluation, RE(%), in the second column.

Answer:PROPERLY DISCARD THE REMAINING PILLS

Explanation: IT COULD BE EXPIRE AND YOU NEED THEM ANY MORE DISPOSE THEM!!!!!!!!

Answer:

properly to discard the remaining pills

Explanation:

Explanation:

Hydrate, diet, and vocal hygiene. I think hydrating is the most important.

Answer:

1) Exercise it by singing and hitting different notes, however don't go overboard

2) Make sure you don't overuse your voice, as well as trying to rest your voice when you are sick

3) Overall, have healthy habits, like not smoking and drinking a sufficient amount of water. Explanation: good job this year. i know it was hard doing everything online

Answer:

1.11g of H2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2Na + 2H2O —> 2NaOH + H2

Next, we shall determine the mass of Na that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:

Molar mass of Na = 23g/mol

Mass of Na from the balanced equation = 2 x 23 = 46g

Molar Mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 1 x 2 = 2g

From the balanced equation above, 46g of Na reacted to produce 2g of H2.

Finally, we shall determine the mass of H2 produced by the reaction of 25.6g of Na. This is illustrated below:

From the balanced equation above, 46g of Na reacted to produce 2g of H2.

Therefore, 25.6g of Na will react to produce = (25.6 x 2)/46 = 1.11g of H2.

Therefore, 1.11g of H2 is produced from the reaction.

Answer:

[tex]n_{H_2}=0.557molH_2\\\\m_{H_2}=1.11gH_2[/tex]

Explanation:

Hello,

In this case, such chemical reaction is represented by:

[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]

Thus, for 25.6 grams of sodium, whose molar mass is 23 g/mol, reacting in excess water, the amount of hydrogen gas, whose molar mass is 2 g/mol, that is obtained is computed by using the 2:1 molar ratio between sodium and hydrogen:

[tex]m_{H_2}=25.6gNa*\frac{1molNa}{23gNa} *\frac{1molH_2}{2molNa} *\frac{2gH_2}{1molH_2} \\\\m_{H_2}=1.11gH_2[/tex]

Or in moles:

[tex]n_{H_2}=25.6gNa*\frac{1molNa}{23gNa} *\frac{1molH_2}{2molNa} \\\\n_{H_2}=0.557molH_2[/tex]

Regards.

Answer:

It cites valid data

Explanation:

It clearly shouldn't cite opinions cause then that isn't science. Every thing else seems like an okay answer but it cites valid data is the best answer since the data should be valid no matter what.

Answer:

Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize ... Investigate whether changing the volume or diluting with water affects the pH. ... Original Sim and Translations ... Lab, Chemistry.

Answer:

Acetic acid is found in significant quantities in Vinegar

Acetic acid is found in large concentration or quantity in the vinegar which acts as a main component of vinegar.

Acetic acid is the main component of vinegar which contains about 4 - 18% of acetic acid. This acid is used as a food preservative as well as food additive.

So we can conclude that acetic acid is found in large concentration or quantity in the vinegar which acts as a main component of vinegar.

Learn more about acetic acid here: https://brainly.com/question/24304533

Answer:

A

Explanation:

A: Eat sagebrush

A rabbit is an animal. It cannot make it's own food. It is a heterotroph, and it needs to feed on other organisms to survive. A pygmy rabbit would eat sagebrush, therefore this is the correct answer.

B: Make their own food

Rabbits and animals can't make their own food, they have to eat other things to survive. Therefore, this answer is incorrect.

C: Perform photosynthesis

Rabbits and animals can't perform photosynthesis, only plants, algae, and certain bacteria can. This answer is also wrong.

D: Convert light energy to chemical energy

In the process of photosynthesis, light energy from the sun is turned into chemical energy. Animals like rabbits can't perform photosynthesis, so this choice is also incorrect.

The best choice is A: eat sagebrush.

Answer:

Calcium

Explanation:

The ability to be hammered into sheets is known in chemistry as malleability. One of the properties of metals is that metals are malleable. All metals thus have a common property that they can be hammered into sheets used in diverse applications. We can see diverse thin sheets of metals around us used to diverse purposes. This is a vary important property of metals that amplify its importance in materials science.

Of all the options listed, only calcium is a metal. Since nonmetals and metalloids can not be hammered into sheets, nitrogen, silicon and fluorine can not be hammered into sheets. Calcium, being a metal can be hammered into thin sheets.

Question:

Options

1) Nitrogen

2) Silicon

3) Fluorine

4) Calcium

Answer:

The correct option is;

4) Calcium

Explanation:

We analyze each of the elements as follows;

Nitrogen is a gas at room temperature, therefore it cannot be hammered into sheets

Silicon is a brittle non-metal, that breaks when struck

Fluorine is a gas at room temperature, therefore it cannot be hammered into sheets

Calcium is a soft, solid silvery-white, metallic element that is ductile, hence, it can be beaten into very thin sheets.

Answer:

All liquid glow products depend on a chemical process known as CHEMILUMINESCENCE to produce their light. Chemiluminesence is a chemical reaction that causes a release of energy in the form of light. To produce this light the electrons in the chemicals become excited and rise to a higher energy level.To utilise this process glowsticks contain two liquids; hydrogen peroxide and tert-butyl alcohol. When mixed together it is these liquids that create the glow. Fluorescent dyes are also used in the alcohol to alter the colour of the light emitted. Chemiluminesence is a chemical reaction that causes a release of energy in the form of light.

Explanation:

Hope It Helps!

Answer:

bone loss and muscle deterioration

Explanation:

this helps the body keep thriving and bones strong and muscles in tact

Answer:

D. Its temperature will remain 100 C until all the vapours condenses

Explanation:

Heat absorbed by a substance to change the state of matter is known as latent heat. This heat is utilized to break the bonds between atoms of the substance so that they can undergo phase change.

So, when water boils at 100 degree Celsius then temperature will remain constant unless and until all the water changes into vapor. As it is the latent heat that breaks the bonds between hydrogen and oxygen atoms of water so that liquid state can change into gaseous state.

Since latent heat is a hidden heat, that is why, it does not get reflected and there is no change in temperature due to it.

Thus, we can conclude that it is true that temperature will remain at 100°C until all the vapor condenses for a sample of water vapor at 101°C as it cools.

Answer:

A. Interpersonal racism

Explanation:

Its not stereotypical to think that an Asian cant speak Spanish. The fact that he thought, Asian-sounding name, is stereotypical on its own, but taking in this entire situation, this is not racial stereotyping. It's also not racial inequality, since Ty isn't saying that Asians are asian people are lesser than another group.  Institutional racism occurs when schools, governments, etc etc that seem race neutral are actually disadvantage racially marginalized groups and privilege whites.

Answer:

B.) Racial stereotyping

Explanation:

Answer:

Static Electricity! :)

Explanation:

Answer:

Option C is correct

Explanation:

Entropy is defined as the randomness in a system. In nature, a system tends to have high entropy. The higher the entropy , the spontaneous the reactions would be. As a system loses energy, it becomes more ordered and less random. Hence, as the reaction proceeds in a system, the system  has higher energy/entropy and less order.  

Hence, option c is correct

Answer:

cylinder A has a higher density then cylinder B or more accurately the liquid in cylinder A is denser then the liquid in the second tube.

Explanation:

"Denser" simply means more matter is contained in the same space for example say you fill a tank with helium and another tank with water. Although they are the same size one will weigh much more because their is more particles or "stuff" inside the same area this can be because of a few things one it can be because the atoms or elements that compose the substance are heavier containing more electrons and protons in their orbit. or the molecular structure is more compact like a chicken wire fence has more wire in it then a barbed wire wire fence covering the same area because of the grid of wire in the middle.

Answer:

A is denser.

Explanation:

Answer: I think that the answer was False.

Answer: false

Explanation:

Gravitational, electrostatic, strong nuclear, and weak nuclear

Answer:

Aluminum is oxidized from 0 to +3

Explanation:

In order to make the question clearer, let me give the reaction equation in terms of chemical symbols. It will aid your understanding of the question posed.

2Al(s) + 6HCl(aq) ----> 2AlCl3(aq) + 3H2(g)

You have to recall that oxidation has to do with increase in oxidation number. A specie is said to be oxidized when the said specie experiences an increase in oxidation number. A reduction on the other hand occurs when a specie undergoes a decrease in oxidation number.

Since the oxidation number of an uncombined element is zero, aluminum has an oxidation number of zero on the left hand side. Over on the right hand side, the oxidation number of aluminium increases to +3. Hence aluminum was oxidized from left to right.

Answer:

Aluminum is oxidized from 0 to +3

Explanation:

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CaCO3, or 100.0869 grams.

Explanation:

Answer:

100% medium

Explanation:

Since you got all Hh which equals medium it means all are going to be that.

Answer:

100% med

Explanation:

Answer:

  Chemicals in fertilizers run off into water and cause algae blooms

Explanation:

Of the answer choices, the ones that have to do with commercial land use are the ones discussing fertilizers. Some commercial land is dedicated to lawn, but commercial farms are a much larger portion of commercial land use. The appropriate choice is, "Chemicals in fertilizers run off into water and cause algae blooms."

Answer:

Explanation:

B

Answer:

B:

Explanation:

Answer:

We have to consume starch and cellulose in large amount in order to increase the consumption of polysaccharides which make our body healthier.

Explanation:

Starch is polysaccharide which is made up of many glucose molecules. it is mostly made in the body of plants and when we eat that plant this starch is transferred to our body and our body use it when it is needed while cellulose also made of hundred of glucose molecules but our body is unable to digest it because our body is unable to break the bonds between the monosaccharide of cellulose. It is good for humans due to the presence of high amount of fibers.

Answer:

253.02 kJ.

Explanation:

The balanced reaction for the decomposition of baking soda is

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

We can find the heat of reaction by using the Hess' Law. This is done by using this formula:

∑(Hf,products) -∑(Hf,reactants) = Heat of reaction

where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:

NaHCO3: -947.68 kJ/mol

Na2CO3: -1130.94 kJ/mol

CO2: -393.51 kJ/mol

H2O: -241.8 kJ/mol

Applying Hess' Law:

[1(-1130.94) + 1(-241.82)] + 1(-393.51)] - [2(-947.68)] = 129.09 kJ

Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ.

Answer:

Simple, the heat of it causes the atoms to move more quickly, which produces and uses energy.

Explanation:

Answer:

By heating in a closed system.

Liquids can reach higher temperatures in a pressure cooker than in an unsealed pot by  the application of heat to the pressure cooker.

A pressure cooker is usually tightly closed with no surrounding air interference which helps to maintain the temperature and increase in the elastic collision of particles. The increase in particle collision helps the liquid in the pot to attain a higher temperature.

However, heating in an unsealed pot makes the interference of surrounding air with it very possible which will definitely slow down the particle collisions and reduce the temperature and pressure due to the both of them being directly proportional to each other.

Read more on https://brainly.com/question/16525236

Number 2 I believe is D and number 3 is most likely A

Answer:

2) The clothes picked up opposite charges which caused them to cling to each other.

3) A crinkled-up ball of aluminum foil will conduct the charges and remove the charges from the clothes.

Explanation:

I'm sure. Like pretty sure.

Hope this helped lots and lots,

sincerely, me

Answer:

troposphere, the stratosphere, the mesosphere and the thermosphere

Explanation:

The atmosphere of the earth is composed of layers based on the temperature. There are four layers in the atmosphere. They are ordered as troposphere, stratosphere, mesosphere and the thermosphere.

The atmosphere of the earth is layered and each layer of the atmosphere has its own characteristics. The weather processes occur in the lower layers of the atmosphere. The four important layers are troposphere, stratosphere, mesosphere and the thermosphere.

The lowest layer of the atmosphere where we live is called the troposphere. It is this layer which contains weather, clouds, rain and snow. The layer above troposphere is called the stratosphere. It is in this part where ozone is found.

The mesosphere is found above stratosphere. Here the temperature is found to be less and reaches a minimum of about -90°C. The thermosphere lies above the mesopause where the temperature will be very high.

Thus the correct order is troposphere, stratosphere, mesosphere and the thermosphere.

To know more about layers of atmosphere, visit;

https://brainly.com/question/29760640

#SPJ3

Answer: “We live on a hunk of rock and metal that circles a humdrum star that is one of 400 billion other stars that make up the Milky Way Galaxy which is one of billions of other galaxies which make up a universe which may be one of a very large number, perhaps an infinite number, of other universes. That is a perspective on human life and our culture that is well worth pondering.”

― Carl Saga

Is this it mate?

Answer:

Frequency, f = 4 Hz

Explanation:

We have,

Number of waves passing a fixed point are 20

Time, t = 5 seconds

It is required to find the frequency of the wave. Frequency of a wave is defined as the number of waves passing through a point per second. Its mathematical form is given by :

[tex]f=\dfrac{n}{t}\\\\f=\dfrac{20}{5}\\\\f=4\ Hz[/tex]

So, the frequency of the wave is 4 Hz.

Answer:

D. 60.3 kilometers per hour

Explanation:

Hello,

In this case, we first compute the miles in kilometres:

[tex]1.25miles*\frac{1.60934km}{1mile} =2.012km[/tex]

Then the minutes in hours:

[tex]2.00min*\frac{1h}{60min}=0.033h[/tex]

Finally, the velocity:

[tex]v=\frac{2.012km}{0.033h}\\ \\v=60.3km/h[/tex]

Thus, answer is D. 60.3 kilometers per hour

Best regards.