The diagram shows three steps in the carbon cycle.
The Carbon Cycle

Which two phrases best summarize the events taking place in Step 2?

A. Cellular respiration

B. Storing carbon dioxide in living organisms

C. Photosynthesis

D. Releasing carbon dioxide into the atmosphere

Answer:

3 g

Explanation:

new mass = (1/2)^n * original mass

where n = number of half lives

(1/2) ^2 * 12

= 3 g

Coefficient A: 2 must be added to the product to balance the equation.

 The mass of the reactant side is always equal to the mass of the reactant side.

To balance the chemical equation coefficient is added to make the number of atoms equal on both sides.

                La₂O₃+ 3H₂O => 2La(OH)₃

Left-hand side of atoms is equal to right-hand side La=2            

                                                                                     O=6

                                                                                     H =6

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Answer:

D

Explanation:

While evaluating you will notice if it works or not

Answer:

There is no compund in the question...could you provide it please?

Answer: +5

Explanation:

The oxidation number of potassium is +1, and the oxidation number of oxygen is -2. So, for the compound to have a charge of 0, the oxidation number of chlorine must be +5.

Answer:

The Clean Water Act and the Endangered Species Act.

Explanation:

mining operations must follow these regulations or else they will not be able to use the land

Answer:

H₂ + O₂ → H₂O

Now, check that oxygen has two atoms on the left and one on the right

so, you put 2 on the right side

H₂ + O₂ → 2H₂O

oxygen is balanced so, add 2 on H₂ to balance out hydrogen

THE FINAL BALANCED EQUATION:

A factor which helped to first drive plants to live on land is: A. greater access to sunlight on land.

In Science, photosynthesis is a light-dependent process and it is typically represented by the following chemical reaction:

Carbon dioxide + water + light energy ⇒ sugar + oxygen

Based on the chemical reaction above, we can infer and logically deduce that light energy (sunlight) obtained from the Sun is a very important factor for photosynthesis.

Consequently, greater access to sunlight on land became a factor which helped to first drive plants to live on land.

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Answer:

it is A step by step

Explanation:

The answers of every subquestion is given below:

Percent yield of the reaction is the percent ratio of actual yield to the theoretical yield.It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%.

The theoretical yield is the amount predicted by a stiochiometric calculation based on the number of moles of all reactants present.

This calculation assumes that only one reaction occurs and that the limiting reactant reacts completely.

The actual yield is the quantity of a product that is obtained from a chemical reaction.

          2 C₆H₁₀ + 17 O₂ ⇒ 12 CO₂ + 10 H₂O

1. When you do this calculation for 35 grams of C₆H₁₀, you find that 113 grams of CO2 will be formed.

When you do the calculation for 45 grams of oxygen,You find that 43.7 grams of CO2 will be formed.Because 43.7 grams is the smaller number forming 43.7 grams of product.

2. Oxygen is the limiting reagent

3. 21.4 grams of C₆H₁₀ will be left over.

4.  80.1%

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Answer:

C20

Explanation:

Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions. Example: Carbon

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. It can be decomposed into simpler constituents using chemical reactions.

Example: Carbon monoxide.

Thus chemical symbol represents an element is C20

Pretty sure this is what you're looking for.

Answer:

Answer: (b) F

Explanation:

Sodium has 1, magnesium has 2 and Aluminium has 3 electrons in its outermost shell whereas Fluorine has 7 electrons in its outermost shell hence Fluorine does not lose electrons easily.

The electronic configuration of fluorine is 2,7.

Fluorine is the ninth element with a total of 9 electrons.

The first two electrons will go in the 1s orbital.

The next 2 electrons for F go in the 2s orbital.

The remaining five electrons will go in the 2p orbital. Therefore the F electron configuration will be 1s22s22p5.

Answer:

The moon's surface has been struck with other objects.

Explanation:

Answer 1 - Craters are not a sign of alien life as there is nothing directly showing the crater's are not natural phenomena.

Answer 2 - Craters are (normally) produced by the impact force of a foreign object that is moving quickly and collides with an object of larger size.

Answer 3 - Volcanos form mountains and magma tubes, not craters.

Answer 4 - The formation of mountains does not relate to craters in any meaningful way.

Answer: The moon’s surface has been struck with other objects.

Explanation: because those crates were caused by drifting objects such as asteroid's and meteorite's that caused craters in the moon.

the answer is D

Answer:          gugygy

Explanation:

1.3 x 10¹⁵ : 1.2 x 10⁹ = 1.083 x 10⁶

Answer:

1.3x 10 15 gallons of water / 1.2x 10 9 gallons/day=

1.1x 10 6 gallons/day

Explanation:

The reactants are Option C , dilute hydrochloric acid and magnesium which turns methyl orange from red to orange .

Indicators are substances that change colour when they are added to acidic or alkaline solutions.

Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory.

Methyl orange in an acidic medium turns Red or orange , Yellow in neutral medium and Yellow in akaline medium .

Phenolphthalein in an acidic medium turns Colourless , Colourless in neutral medium and Pink in akaline medium .  

Magnesium reacts with hydrochloric acid to produce hydrogen gas

Mg (s) + 2 HCl (aq) → MgCl₂ (aq) + H₂ (g)

In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium.

So the solution is acidic and therefore when methyl orange are added to a reaction mixture methyl orange turns from red to orange

Therefore the The reactants are Option C , dilute hydrochloric acid and magnesium which turns methyl orange from red to orange and H₂ gas is produced .

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Answer:

See below

Explanation:

goes down....turns more acidic   as HCl is added to water

Answer:

Decrease

Explanation:

There will be a decrease in the pH of the water solution.

The pOH of pure water at 40 degree C is 6.8, then the hydronium ion concentration in pure water at this temperature is 6.3 × 10⁻⁸M.

Relation between the pH and pOH will be represented by the following equation:

pH + pOH = 14

Given that, pOH of water = 6.8

Then pH will be pH = 14 - 6.8 = 7.2

We know that, pH = -log[H⁺]

[H⁺] = [tex]10^{-pH}[/tex]

[H⁺] = [tex]10^{-7.2}[/tex] = 6.3 × 10⁻⁸M

Hence concentration of hydronium ion at that temperature is 6.3 × 10⁻⁸M.

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The rate of formation of water and the decomposition of hydrogen peroxide is double as compared to rate of formation of oxygen.

The chemical reaction is given as the reaction of the reactants in the process to form the new compound.

The chemical reaction with the decomposition of hydrogen peroxide is:

[tex]\rm 2\;H_2O_2\;\rightarrow 2\;H_2O\;+\;O_2[/tex]

The rate of formation of water is given to be double the rate of formation of oxygen as 2 moles of water formed with 1 mole of oxygen.

The rate of disappearance of hydrogen peroxide is double with formation of oxygen as for decomposition of 2 moles of hydrogen peroxide, 1 mole of oxygen is formed.

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CH₂O = C + 2.H + O

= 12.01 + 2 x 1.008 + 16

= 30.026 amu = 30.026 g/mol

When aqueous sodium phosphate reacts with aqueous copper(ii) sulfate then the formation of Cu₃(PO₄)₂ precipitate and aqueous solution of sodium sulfate takes place.

Double displacement reactions are those reactions in which two elements are displaced within the reaction.

Given chemical reaction is:

Na₃PO₄(aq) + CuSO₄(aq) → Cu₃(PO₄)₂(s) + Na₂SO₄(aq)

In the above reaction sodium and copper ions are displaced between each other by which Cu₃(PO₄)₂ precipitate and aqueous solution of sodium sulfate is formed.

Hence in the above reaction precipitate of Cu₃(PO₄)₂ is formed.

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Answer: 0.065

Explanation:

With an Ag concentration of 0.020 M and a Pb2+ concentration of 0.0010 M, Only PbSO₄(s) will precipitate. The correct option is C.

Molarity is the measure of the concentration of any solute in per unit volume of the solution.

The equations are

[tex]\rm Ag_2SO_4--- > 2Ag++SO4^{-2}[/tex]

[tex]PbSO_4--- > Pb_2+ +SO4^{-2}[/tex]

Therefore:

[tex]Ag_2SO_4=[0.02^2[0.001]]\\Ag_2SO_4=4 \times 10^{-7}[/tex]

and

[tex]PbSO_4=[0.001^2[0.001]]\\PbSO_4=4*10^{-6}[/tex]

Since, [tex]PbSO_4 > > PAg_2SO_4[/tex], only  PbSO₄ will precipitate.

Thus, the correct option is (C) Only PbSO₄(s) will precipitate.

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Answer:

recycle and dispose of trash properly

minimize use of fertilizer

use environmentally friendly modes of transportation

scientists say creating marine refuges where fishing, mining, and recreating are off limits, make the reefs healthier, and so more resilient

Answer:

Keep the pace of 5 C up until you get to about 60 C. Than Measure the totl amount of heat added to the factor of these numbers.

Explanation:

The symbol of the radioactive nuclide given the data is superscript 40 subscript 19 upper K (⁴⁰₁₉K)

An atom is composed of sub-particles which include

The symbol of an atom showing its atomic number and molar mass can be represented as follow

ⁿₓA

Where

ⁿₓA => ⁴⁰₁₉K

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Answer:

c

Explanation:

edge

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Here we go ~

1 mole of [tex] \sf{ COCl_2} [/tex] has 6.022 × 10²³ molecules of the given compound.

So, 0.78 mole of [tex] \sf{COCl_2} [/tex] will have ~

[tex]\qquad \sf  \dashrightarrow \: 0.78 \times 6.022 \times 10 {}^{23} [/tex]

[tex]\qquad \sf  \dashrightarrow \: \approx4.7 \times 10 {}^{23} \: \: \: molecules[/tex]