SOMEONE PLEASE HELP ME

Answer:

6 oxygens on the product side

Explanation:

1) balance the equation:

C2H4 + 3O2 → 2CO2 + 2H2O

2) calculate the number of oxygens on the product side

2CO2=4

2H2O=2

According to the law of conservation of mass, there are 6  atoms of oxygen in the product of this reaction.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Answer:

slowing the rate of enzyme action

Explanation:

The prevention of fruits browning is the result of :

>slowing the rate of enzyme reaction

The browning of fruits can be slowed down by preventing the enzyme from working properly. Lemon juice contains an acid which can stop enzymes from working properly. For example, water and sugar in jam prevents oxygen in the air to reach enzymes and hence protects from browning.

Always keep cut fruits such as apples, pears and peaches from turning brown by coating them with an acidic juice such as lemon or orange.

The enzyme that is responsible for the browning is called polyphenol oxidase. PPO enzyme in the presence of oxygen changes substances known as phenolic compounds, through oxidation, into quinones.

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Answer:

Life on Earth depends on energy coming from the Sun. About half the light reaching Earth's atmosphere passes through the air and clouds to the surface, where it is absorbed and then radiated upward in the form of infrared heat. About 90 percent of this heat is then absorbed by the greenhouse gases and radiated back toward the surface. Scientists attribute the global warming trend observed since the mid 20th century to the human expansion of the "greenhouse effect"  warming that results when the atmosphere traps heat radiating from Earth toward space.

Certain gases in the atmosphere block heat from escaping. Air pollution is the main cause of rise in temperature over the past century. Due to increase in the industrialization in different countries of the world and also burning of more fossil fuels in the engines of vehicles and jets are the main reasons for increasing global temperature. On Earth, human activities are changing the natural greenhouse. Over the last century the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2. To a lesser extent, the clearing of land for agriculture, industry, and other human activities has increased concentrations of greenhouse gases.

Climate extremes, such as droughts, floods and extreme temperatures, can lead to crop losses and threaten the livelihoods of agricultural producers and the food security of communities worldwide. Depending on the crop and ecosystem, weeds, pests, and fungi can also thrive under warmer temperatures, wetter climates, and increased CO2 levels, and climate change will likely increase weeds and pests.

Why does burning fossil fuel affect the environment?

How does the atmosphere play into this all?

How do cars affect the global climate?

How do greenhouse gases such as carbon dioxide cause global warming?

Explanation:

A heater is placed under one corner of a water bed mattress. Warm water moves throughout the mattress because of convection. The correct option is B.

Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids.

Conduction is used to move heat from the object to the fluid initially, but fluid motion is responsible for the bulk of the heat transfer.

When heat is transferred from your body by moving air, convection takes place. The air will rise if it absorbs your heat and is cooler than the environment.

Cooler air moves in to take its place and absorb more of your warmth as the warmed air rising around you increases. You feel cooler as this air moves more quickly.

Thus, the correct option is B.

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Answer:

so basically the particles move faster

Explanation:

which is made from the cause of a chemical reaction do u get it now?

Answer:

true

Explanation:

Answer:

Electrically neutral atoms simply possess the same number of electrons as protons. This gives the objects a balance of both type of charge. There are 11 electrons and 10 protons. This results in an imbalance of charge.

- Physicsclassroom

Answer:

Electrically neutral atoms  possess the same number of electrons as protons. (It gives the objects a balance of both type of charge).

Explanation:

Answer:

is it from bleacH?

Explanation:

hazardous

Answer:

halogen family

Explanation:

Answer:

E = 2.15 ×10⁻¹⁷J

Explanation:

Given data:

Wavelength of X-ray = 9.23 nm (9.23×10⁻⁹ m)

Energy of x-ray = ?

Solution:

Formula:

E = hc/λ

h = planks constant = 6.63×10⁻³⁴ Js

c = speed of light = 3×10⁸ m/s

by putting values,

E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s /9.23×10⁻⁹ m

E = 19.89 ×10⁻²⁶ J.m/9.23×10⁻⁹ m

E = 2.15 ×10⁻¹⁷J

Answer:

E = 2.05×10⁻²³ J

Explanation:

Given data:

Wavelength of transmission = 9.7 mm (9.7/1000 = 0.0097 m)

Energy of transition = ?

Solution:

9.7 mm (9.7/1000 = 0.0097 m)

9.7×10⁻³ m

Formula:

E = hc/λ

By putting values,

E = 6.63 ×10⁻³⁴ Js × 3×10⁸ m/s / 9.7×10⁻³ m

E = 19.89×10⁻²⁶ J.m / 9.7×10⁻³ m

E = 2.05×10⁻²³ J

Answer:

reduce water loss  

absorb sunlight

take in carbon dioxide

produce oxygen

Explanation:

i think

Answer:

A, D, and E

Reduces water loss, take in carbon dioxide, and produce oxygen.

Explanation:

Answer:

Divergent boundary plate

Explanation:

I hope this helps but this question has its answer at the top of google when you search it

Question:

A mid-ocean ridge occurs at what boundary?

1. Convergent Boundary Plate

2. Divergent  Boundary Plate

3. Transform Boundary Plate

Answer:

2. Divergent Boundary Plate

Answer:

The formula for sucrose is

C12H22O11

moles sucrose = mass / molar mass  

= 6.0 g / 342.30 g/mol

= 0.017528 mol

the formula shows that each sucrose molecule has 22 H atoms

so moles H = 22 x moles sucrose

= 0.3856 mol

mass H = molar mass x moles

= 1.008 g/mol x 0.3856 mol

= 0.3887 g

= 0.39 g ( 2 sig figs)

Answer:

Tectonic plates

Explanation:

Tectonic plates are large plates that moves. There are different types of plate motion as a result of mantle convection.

Answer:

[tex]MgF_2[/tex]

Explanation:

Hello!

In this case, since, when we see an ionic binary salt like that formed by magnesium (metal) and fluorine (nonmetal), in order to set up the correct molecular formula we need to check out the periodic table in order to identify the suitable oxidation states, since metals remain positively charged as they lose electrons and nonmetals negatively charged as they gain electrons.

In such a way, since the oxidation state of magnesium is +2 and that of fluorine is -1 we write:

[tex]Mg^{2+}F^-[/tex]

Next, we need to exchange the oxidation states as subscripts without the charge to obtain:

[tex]MgF_2[/tex]

Which is the corrected molecular formula for magnesium fluoride.

Best regards!

Answer: i dont no

Explanation:

ddd

Answer:

FeCl₂ · 6H₂O = 234.75 g/mol

Explanation:

Iron (II) = Fe²⁺

Number between () indicates the oxidation state

Chloride = Cl⁻

Iron (II) chloride = FeCl₂

If we say hexahydrate, it means that our salt is hydrated by 6 molecules of water.

FeCl₂ · 6H₂O = Iron(II) chloride hexahydrate

Molar mass is = 55.85 g/mol + 35.45 g/mol . 2 + 6 . 18g/mol  = 234.75 g/mol

We have just summed molar mass of Fe, plus Cl (x2), plus 6 H₂O

Answer:

D. TTACGCCAGG. that would be your answer.

Answer:

i think its either A TTGTACCTCC or D TTACGCCAGG

Explanation:

Answer:

You have to apply the base to an acid burn and vice versa.

Explanation:

If acid or base is spilled on the skin, immediately wash the affected area gently with lukewarm water and get medical attention immediately. Therefore, option (D) is correct.

Exposure to strong acids or bases such as sulphuric acid can take place as skin contact, inhalation of vapors, or ingestion. Each type of exposure can rise serious hazards to health and must be managed quickly and reduce damage and health risks appropriately by medical professionals.

If acid comes into contact with the skin, quickly wash the affected area gently with cold water and seek medical attention immediately. If acid or base gets into your eyes, then flush the eyes with water.

If accidentally ingest strong acid or base, rinse your mouth immediately with water and continually rinse your mouth with water. If you inhale acid or base aerosols, breathe fresh air, and get medical attention immediately.

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Answer:

the sucrose mass is 264.g

Explanation:

The computation of the sucrose mass is shown below;

The Molar mass of [tex]C_{12}H_{22}O_{11}[/tex] is  342.3 g/mol

And, the molar mass of [tex]H_2O[/tex] is 18g/mol

The mass of [tex]C_{12}H_{22}O_{11}[/tex] be Y

Now

The moles of [tex]C_{12}H_{22}O_{11}[/tex] is

= Mass of [tex]C_{12}H_{22}O_{11}[/tex] ÷  molar mass of [tex]C_{12}H_{22}O_{11}[/tex]

= Y ÷ 342.3 mol

And,

The moles of [tex]H_2O[/tex] is

= Mass of [tex]H_2O[/tex] ÷  molar mass of [tex]H_2O[/tex]

= 100.0 ÷ 18

= 5.56mol

Now

The molar fraction of [tex]C_{12}H_{22}O_{11}[/tex] is

= Moles of [tex]C_{12}H_{22}O_{11}[/tex] ÷  (moles of[tex]C_{12}H_{22}O_{11}[/tex] + moles of [tex]H_2O[/tex])  = 0.124

= (Y ÷ 342.3) ÷ [(Y ÷ 342.3) + 5.56] = 0.124

Y ÷ 342.3 = 0.124 × [(Y ÷ 342.3 + 5.56]

Y = 0.124 × Y + (0.124 × 5.56 × 342.3)

Y = 269.4 g

hence, the sucrose mass is 264.g

Answer:

I want to say option C: Testing which surfa e is easier to slide a wooden block across.

Explanation:

I'm not 100 % sure though with my answer. I'm truly so very sorry if my answer is wrong. I tried my best.

In physics, friction is said to be the opposing force that resists any object. Testing which surface is more effortless to slide a block across can be used to investigate friction. Thus, option c is correct.

Friction has been defined as the resisting force that opposes the movement of objects across the surface. It can also be said as a force that opposes the relative motion of an object.

The friction can be rolling, sliding, fluid, or static depending on the surface and type of object. The frictional force is present only when the object has been in contact of the surface body.

When a surface is tested for sliding the wooden block, then the sliding friction has been used. It is possible as the resistant force of the surface with respect to the block is taken into the consideration.

Therefore, option C. the surface testing for sliding wooden blocks involves friction.

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Answer:

Triacylglycerols (triglycerides) are non-polar or hydrophobic molecules

Glycerophospholipids (phosphoglycerides) are polar or hydrophilic

Explanation:

Triacylglycerides (TGs) are esters synthesized by the esterification of three molecules of glycerol and fatty acid, and this is essentially by the replacement of the three hydroxyl groups on glycerol with three fatty acids. This removes the hydrophilic property from the glycerol molecule hence TGs are only soluble in non-polar solvents like alcohol and benzene, and TGs are therefore the storage forms of fats in adipose tissues.

Glycerophospholipids are formed by the addition of two hydrophobic fatty acid groups and one phosphoric acid (phosphate group) to glycerol (alcohol) leaving a hydrophilic head (phosphate end) and a hydrophobic tail (fatty acid ends). This amphipathic property of this molecule makes it a suitable molecule for membrane structures, especially of cells (lipid bi-layer), with an arrangement where the hydrophilic side interacts with the aqueous environment, while the hydrophobic side makes contact with the non-aqueous environment.

Triacylglycerols-

Glycerophospholipids-

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Answer:

[K₂CrO₄] → 8.1×10⁻⁵ M

Explanation:

First of all, you may know that if you dilute, molarity must decrease.

In the first solution we need to calculate the mmoles:

M = mmol/mL

mL . M = mmol

0.0027 mmol/mL . 3mL = 0.0081 mmoles

These mmoles  of potassium chromate are in 3 mL but, it stays in 100 mL too.

New molarity is:

0.0081 mmoles / 100mL = 8.1×10⁻⁵ M

Answer B3

Explanation:

Explanation:

i think 3x10^5

hope this helps if not sorry

Answer:

8 hours 20 minutes

Explanation: