PLEASE HELP ASAP!!!!!!!!

Answer:

The unknown element is Carbon.

(a) X is Carbon, its oxide is of acidic nature

(b) C+ O2 → CO2

Explanation:

We are given an unknown element that reacts with oxygen.

X + O2 → XO2

It is given that the oxide XO2 turns blue litmus red which is shown by acids, so XO2 is an acidic oxide. Also X will be a Non metal because Non metallic oxide is Acidic in nature.

The Oxide XO2 is dissolving is water. The oxide upon reacting with water will give an Acid.

XO2 type of oxide is found in the 14th group of the periodic table generally

So we have options like C, Si and Ge as these only have the Acidic oxide.

But when it comes to reactivity with water Only Carbon satisfies the need so the unknown element X is C.

CO2 + H2O → H2CO3 which is an acid.

(a) Element X is Carbon (C), The nature of the compound formed is Acidic.

(b) The reaction given will be as follows

     C+ O2 → CO2

Therefore the unknown element is Carbon.

Answer:

Don't travel by air if you can avoid it because air travel uses up large amounts of fossil fuels and creates greenhouse gases. Dispose of any rubbish responsibly - it can be hazardous to wildlife. Use public transport, cycle or walk instead of using a car. Use facilities and trips run by local people whenever possible.

Answer:

Practicing recycling and green computing

The Theoretical yield is the highest amount of product that could be formed from the allocated amounts of reactants.

The Theoretical yield is the greatest amount of product that could be formed from the given quantities of reactants.

The Actual yield is the quantity of product that is formed when the response is carried out in the laboratory.

The Percent yield is the ratio of the authentic yield to the theoretical yield, described as a percentage.

Percentage Yield Formula: When the product that we are obtained after a chemical reaction is known as the yield. We can estimate this accepted yield in moles or grams.

It is the ‘authentic yield’ that we acquire after the completion of a chemical reaction. Separated from this, established on our estimation, we calculate the anticipated yield of a reaction comprehended as the ‘theoretical yield.’

Find more information about Theoretical yield here:

https://brainly.com/question/11683739

Answer:

I believe its A) Law of simple multiple proportions

Explanation:

The law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass.

Answer:

A) Law of simple multiple proportions

Explanation:

suspended solids from water

Answer:

the first two elements of array are checked and the largest of these two elements are placed in arr[0]

the first and third elements are checked and largest of these two elements is placed in arr[0] .

this process continues until the first and last elements are checked.

Explanation:

Then you would find the largest Elements

Answer:

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

Answer:

The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of the amount of unstable material to degrade into a more stable material. For example, a source will have an intensity of 100% when new. At one half-life, its intensity will be cut into 50% of the original intensity.

Explanation:

Answer:

plz refer to the attachment above .

The number of moles of sucrose dissolved in 250 mL of solution will be = 0.375.

The total number of moles of solute in a given solution's molarity is expressed as moles of solute per litre of solution. As opposed to mass, which fluctuates with changes in the system's physical circumstances, the volume of a solution depends on changes in the system's physical conditions, such as pressure and temperature.

M, sometimes known as a molar, stands for molarity. When one gramme of solute dissolves in one litre of solution, the solution has a molarity of one. Since the solvent and solute combine to form a solution in a solution, the total volume of the solution is measured.

Molarity Formula: (number of moles of solute) / volume

The ratio of the moles of the solute whose molarity needs to be computed to the volume of solvent needed to dissolve the supplied solute is the equation for determining molarity.

Molarity = (number of moles of solute) / volume

0.15 * 250/1000 = number of moles

Number of moles = 15/100 * 25/100 = 0.375

Therefore, the number of moles of sucrose dissolved would be 0.375.

Read more about Molarity, here

https://brainly.com/question/8732513

#SPJ2

Answer:

The correct option is;

A. It would favor the forward reaction

Explanation:

Le C_h_a_t_e_l_i_e_r_'s principle states that for a system in dynamic equilibrium a change in the volume, pressure, concentration, or temperature will cause a predictable shift in the reaction to bring about a shift in the equilibrium position which counteracts the change and bring about the establishment of a new equilibrium

Therefore, in the reaction, H₂O + CO₂ → H₂CO₃, we have;

An increase in the amount of the CO₂ concentration in the blood, increases the quantity of the reactants more than the quantity present at equilibrium, therefore, the number of reaction between the H₂O and the CO₂ increases resulting in the formation of more H₂CO₃, therefore, favoring the forward reaction.

Answer:

A. It would favor the forward reaction.

Explanation:

A.P.E.X

Answer:

Molarity = 0.65 M

Explanation:

Given data:

Mass of CH₄N₂O  = 250 g

Volume of solution = 6.0 L

Molarity of solution = ?

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Number of moles of solute:

Number of moles = mass/molar mass

Number of moles = 250 g/ 64.08 g/mol

Number of moles = 3.9 mol

by putting values,

Molarity = 3.9 mol / 6.0 L

Molarity = 0.65 M

Answer:

C

Explanation:

The question is incomplete, the complete question is;

Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.

Experimental melting point is BELOW literature value

Experimental melting point is CLOSE to literature value

WIDE melting point range

NARROW melting point range

Answer:

narrow melting point-pure sample of a single compound

experimental melting point is close to literature value-pure sample of a single compound

wide melting point range-impure sample of multiple compounds

experimental melting point is below literature value-impure sample of multiple compounds

Explanation:

The experimental melting point of a pure single compound is sharp and extremely close to the melting point of the substance as recorded in the literature. Usually, a pure substance melts within a narrow range of temperatures.

Impure samples of multiple compounds melt over a range of temperatures. Also if the experimental melting point is well below the record in literature, then the sample is contaminated by other compounds.

Answer:

MgF₂

Explanation:

Fluorine only has a 1- charge, so to satisfy the 2+ charge on magnesium–– you need 2 fluorine atoms to balance out the charges.

Answer:

D

Explanation:

at a point somewhere along the equator

In the case when the Sun appears to be directly overhead at noon should be along with the equator.

It is considered to be the imaginary line that should be arounded with the middle of the planet or the celestial body. It is halfway that lies between the  North Pole and the South Pole, at 0 degrees latitude. In the equator, it divides the planet into a Northern Hemisphere and a Southern Hemisphere

Therefore, based on the above explanation, the option d is correct.

Learn more about sun here: https://brainly.com/question/20827000

Answer: Changing the number of electrons will change the overall charge on an atom.

Explanation:

An atom that loses electrons will become positively charged and an atom with added electrons will become negatively charged. ... A charged atom is called an ion.

Answer:

77 moles

Explanation:

The given chemical compound is CCl2F2 is called Dichlorodifluoromethane. In CCl2F2, we have:

one mole of a Carbon atom.

two moles of Chlorine atom; &

two moles of Fluorine atom.

Given that one mole of Chlorine = 38.5 moles.

Then, two moles will be:

= 2 × 38.5 moles

= 77 moles

Answer:

Ca(OH)2

Explanation:

Answer:

A

Explanation:

Question: Which cup has more thermal energy?

                  A. 2 liter cup of milk

                  B. 1 liter cup of milk

Answer: A. 2 liter cup of milk

Explanation:

We have milk in both of the containers. The milk in both containers is the same temperature, so we will have to measure the amount of molecules. The amount of molecules makes it warmer, and if it is warmer, that is more energy. 2 liters have more thermal energy than 1 liter, because it has more molecules.

Our answer is 2 liter cup of milk.

Answer:

more than 30 seconds

Explanation:

theres some extra

question : To study the actions of the enzyme catalase on hydrogen peroxide, students performed the following experiment. Catalase was extracted from potatoes and stored on ice. The following hydrogen peroxide solutions were made: 1%, 5%, 10%, 15%. Filter paper disks were soaked in the catalase then dropped into each of the solutions. Enzyme activity was measured by the time it took for the disks to float from the bubbles produced. Here is the data:

Which of the following best describes why the disks float faster to the surface in more concentrated solutions?

asnwer

the higher substrate concentrations in the more concentrated solutions speeded up the reaction

yw!

Answer:

They fertilize the land and help with overgrowth.

Explanation:

The  one way that grazing animals help to maintain grassland ecosystems is: It enhance the plant to grow.

Ecosystems  enables both living organisms such as  animals and non living organisms such as plant to communicate with one another in an environment.

Grazing animals is essential as it help to maintain the  grassland ecosystems by quicken and boosting the growth of plant which inturn help to maintain a very healthy and sustainable  ecosystems.

Grazing lead to the restoration of habitat as it help to  restore back any form of damaged that occur to the natural resources of  ecosystems.

Learn more about ecosystems here:

https://brainly.com/question/13979184

Answer: It could burn or freeze anything

Explanation:

Answer:

The carcinogen (U.V.) helps to stabilize the formation of clouds and maintain life in ecosystem.

If drastic changes were made to the radiation of sun, it will lead to ecological imbalance such as changes in O3 layer, etc and surely, the last day (D-day, what we majorly call) will come!

Answer:

Mitochondrion is the cell organelle where cellular respiration occurs.

Hope it helps ^^

Answer:

Mitochondria

I hope this helps!

Answer:

When the Earth rotates on its axis, it prevents air currents from going in a straight line to the north and the south from the equator. It results in one of the effects of rotation of the Earth: the Coriolis Effect.

I believe that's true.

Answer:

propyl

1-propylmethane or 2-methylpropane

Answer:

Pressure (P) , Volume (V) , Temperature (T)

Explanation:

An ideal gas has three variables that define its state. They are: absolute pressure (P), volume (V), and absolute temperature (T). The ideal gas law defines how these state variables relate to each other

-------HOPE IT HELPS---------