In the outline of the Periodic Table below, some elements are shown as numbers.
Which two numbers are metals in the same period?

Answer:

D.

Explanation:

Hurrocanes are caused from un wanted mixed weather

Answer:

Explanation:

Explanation:

If Earth’s temperatures increase, it would likely have these effects:

The East Coast of the United States will face an increased risk of hurricanes as warmer waters increase evaporation.

The polar region will experience melting ice caps, which will cause sea levels to rise.

Warmer water in the Great Lakes will cause heavier lake-effect snows.

In the Pacific Ocean, heating of the water will cause a change in convection currents.

Hot, dry conditions will increase the risk of wildfires in the forests of California.

In the Himalayas, animal and plant life will migrate to higher ground to live.

The coastal regions of Europe will be at greater risk of flooding because of rising sea levels.

Answer:

B.

Explanation:

Answer:

Q = -897 kJ/mol

Explanation:

From the given information:

The heat released Q = -65.9 kJ

To start with the molar mass of [tex]H_2O_2[/tex] = 2 × (molar mass of H) + 2 × (molar mass of O)

= (2 × 1.008) + (2 × 16.0 )

= 34.016 g/mol

However, given that:

mass of [tex]H_2O_2[/tex]  2.50 g

The number of moles of [tex]H_2O_2[/tex]  = [tex]\dfrac{mass}{molar \ mass}[/tex]

[tex]= \dfrac{2.5}{34.016}[/tex]

[tex]= 7.349 \times 10^{-2} \ mol[/tex]

Finally; Using the formula:

[tex]\Delta H = \dfrac{Q}{number \ of \ moles}\\ \\ Q = \dfrac{-65.9 \ kJ}{7.349 \times 10^{-2} \ mol}[/tex]

Q = -897 kJ/mol

Sorry but I really need these points I just need 5 more sorrrryyy

Explanation:

the first shell have 2 electrons

the second shell also have 8 electrons

the third shell also have 8 electrons

the fourth shell have only 1 electron

so the electronic configuration of Potassium is

2,8,8,1

Answer:

0.41kg/s

Explanation:

Question 5 In the Haber reaction, patented by German chemist Fritz Haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. This reaction is now the first step taken to make most of the world's fertilizer. Suppose a chemical engineer studying a new catalyst for the Haber reaction finds that 505. liters per second of dinitrogen are consumed when the reaction is run at 172 °C and the dinitrogen is supplied at 0.88 atm. Calculate the rate at which ammonia is being produced. Give your answer in kilograms per second. Round your answer to 2 significant digits. Clears your work. Undoes your last action. Provides information about entering answers.

Step 1: Convert 172 °C to Kelvin

We will use the following expression.

K = °C + 273.15

K = 172°C + 273.15 = 445 K

Step 2: Calculate the moles of N₂ consumed every second

We will use the ideal gas equation.

P × V = n × R × T

n = P × V/R × T

n = 0.88 atm × 505. L/(0.0821 atm.L/mol.K) × 445 K = 12 mol

Step 3: Calculate the rate of production of ammonia

Let's consider the balanced equation for the synthesis of ammonia.

N₂ + 3 H₂ ⇒ 2 NH₃

The molar ratio of N₂ to NH₃ is 1:2. The rate of production of ammonia is:

12 mol N₂/s × 2 mol NH₃/1 mol N₂ = 24 mol NH₃/s

Step 4: Convert the rate from mol/s to kg/s

We will use the following conversion factors:

[tex]\frac{24mol}{s} \times \frac{17.03 g}{1mol} \times \frac{1kg}{1000g} = 0.41kg/s[/tex]

Answer:

5 is the perfect Ans for this

Answer:Both renewable and nonrenewable resources can be used to generate electricity, as a heat source, and for vehicle fuel. ... The use of renewable resources typically has less environmental impact in the form of pollution than the use of nonrenewable resources.

Explanation:

Answer:

Explanation:

same thing as normal plane. just replace normal metal with this new sick metal :cool:

also make sure it weighs a good amount and won't fall from weight... im confused was this already answered???

Answer:

Collaborate with other engineers in the design of a plane made from this metal

Explanation:

<3

Answer:

in the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.

Explanation:n the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.

Plants and small organisms like plankton absorb mercury in the water via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

Biomagnification is the condition in which the chemical concentration in an organism exceeds the concentration of its food when the organism's diet is the primary exposure route.

Any concentration of a toxin, such as pesticides, in the tissues of tolerant species at increasingly higher levels in a food chain is referred to as biomagnification. One example of biomagnification in action is the accumulation of the insecticide DDT in zooplankton.

Mercury is taken up by water, plants, and small organisms such as plankton via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

Thus,  Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

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Answer:

Saan yung tanong?? +?? ++?

Answer: true

Explanation:

Energy changes are a common component of physical and chemical changes in matter. Hence the statement is True.

Physical changes and chemical changes are the two different types of changes that chemists examine. A substance can undergo physical changes without having its identity altered. Chemical transformations take place when one substance transforms into another.

When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that atoms and molecules are ordered, which leads to the formation of new substances with new properties.

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Answer:

c. nitrogen gas

Explanation:

Our air is a homogeneous mixture of many different gases and therefore qualifies as a solution. Approximately 78% of the atmosphere is nitrogen, making it the solvent for this solution.

Answer:

243 K.

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 0.2 L

Initial temperature (T₁) = 270 K

Final volume (V₂) = 0.18 L

Final temperature (T₂) =?

The final temperature of the gas can be obtained by using the Charles' law equation as illustrated below:

V₁ / T₁ = V₂ / T₂

0.2 / 270 = 0.18 / T₂

Cross multiply

0.2 × T₂ = 270 × 0.18

0.2 × T₂ = 48.6

Divide both side by 0.2

T₂ = 48.6 / 0.2

T₂ = 243 K

Thus, the final temperature of the gas is 243 K

Answer: you will change the atom from one element to a different element. Sometimes, when you add a proton to an element, the element will become radioactive. If you change the number of neutrons in an atom, you get an isotope of the same element.

Explanation:

The true statement is that the concentrations of reactants and products remain constant chemical equilibrium is achieved.

Equilibrium is a condition where no change in the system of the reaction takes place.

If we represent a chemical reaction in the equilibrium state as:

A + B ⇄ C + D

Where, A & B are reactants and C & D are products and at the equilibrium condition concentration of reactant as well as of products remain constant which is dedicated by double headed arrow.

Hence in equilibrium concentration of reactants as well as of products are constant.

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Answer:

true

Explanation:

Answer:

m = 51.93 grams

Explanation:

Given that,

Energy added, Q = 747 joules

The specific heat capacity of Aluminium, c = 0.899 J/g°C

The temperature goes from 105.0°C to 121.0°C.

Let the mass of the aluminum sample is m. We know that, the heat added to the system is given by :

[tex]Q=mc\Delta T\\\\m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{747}{0.899 \times (121-105)}\\\\m=51.93\ g[/tex]

So, the mass of the sample is 51.93 grams.

Answer:

51.81g of K2O are produced

Explanation:

Based on the reaction, 4 moles of K reacts per mole of oxygen to produce 2 moles of K2O. To solve this question we must find the moles of each reactant in order to find the limiting reactant. With limiting reactant we can find the moles of K2O produced and its mass:

Moles K -Molar mass: 39.0983g/mol-

43g * (1mol / 39.0983g) = 1.1 moles K

Moles O₂ -Molar mass: 32g/mol-

32g * (1mol / 32g) = 1mol O₂

The moles required for the reaction of 1 mole of O₂ are 4 moles of K. As there are just 1.1 moles, K is the limiting reactant.

The moles and the mass of K2O produced are:

1.1moles K * (2mol K2O / 4mol K) = 0.55 moles K

Molar mass K2O = 94.2g/mol

0.55 moles K * (94.2g / mol) =

Answer:

An abrasion or scrape. Spray or pour hydrogen peroxide on the womb. Then apply a patch wrapped to it with an adhesive tape.

Solution :

a). In this experiments, we can determine the hardness of the water or [tex]$Ca^{2+}$[/tex] ion concentration in the sample.

b). The Possible errors are :

- During the weighing of calcium standard preparation, if the balance is not traced properly, it will cause an error.

- By dilution of standard from the stock will lead a dilution error of 0.1 mL for 100 mL.

- Misreading the liter values will give an error.

c). Depending upon the calcium content present in the soil, we conclude that the fertile percent of the soil as well as the mineral capacity of the soil.

Answer:

4 hours a day

Explanation:

240/60=4

Answer:

They cannot be re-melted by heating to form into new shapes.

Explanation:

Recycling refers to the process of melting a plastic and making it into another shape or size.

Thermoplastics can be softened repeatedly, melted and remoulded. Thermosetting polymers can not be softened, melted and remoulded once they are formed.

Hence, thermosetting polymers cannot be re-melted by heating to form into new shapes therefore they can't be recycled.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

But from the question

volume = final volume of water - initial volume of water

volume = 165 - 150 = 15 mL

We have

[tex]density = \frac{225}{15} = 15 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

(a) Crop rotation.

Explanation:

Crop rotation is the rotational cultivation of crops one after another in the same field or area. This means that different crops are cultivated in sequence, one after the other, on a rotational basis.

Crop rotation is one way of maintaining the nutrients of the soil. It also allows for the production of different crops without the need to move from one place to another. Crop rotation also helps in growing seasonal crops, thereby making crop production stable, providing a constant supply of crops for the farmers.

Thus, the correct answer is option a.

Answer:

Explanation:

Look here,

2H2 + O2. --> 2H2O

On,

LHS = 2 × H2 = 4H atoms and 2O atoms

RHS = 2 × H2 = 4H atoms and 2 × O = 2O atoms

Hence,

LHS = RHS and above equation is balanced.