Can somebody please help i have to turn my computer in like 30 minutes

Answer:

Alpha decay is one type of radioactive decay, in which an atomic nucleus emits an alpha particle, and thereby transforms (or "decays") into an atom with a mass number decreased by 4 and atomic number decreased by 2.

Explanation:

Answer:

determining how many ozone molecules are lost in the atmosphere

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Answer:

[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{N}[/tex]

Explanation:

The unbalanced nuclear equation is

[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, ?[/tex]

Let's write the question mark as a nuclear symbol.

[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{Z}^{A}\text{X}[/tex]

The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.  

Then

15 =  0 + A, so A = 15 -   0 = 15, and

 6 = -1 + Z, so Z  =   6 + 1 =    7

Then, your nuclear equation becomes

[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{X}[/tex]

Element 7 is nitrogen, so the balanced nuclear equation is

[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{N}[/tex]

Answer:

Your answer is D. It is the heat required to change a gram of substance from a liquid to a gas.

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1. The members on each side of the river with unfavorable traits for their climate will pass away, manage to produce offspring with favorable traits, or try their best to adapt.

2. A flood isolated the rabbits.

3. If the river and climate conditions remain the same as described above, the original species of rabbit will produce offspring that have favorable traits and eventually most of the rabbits will have those traits.

4. Genetic variation allows different genes to form, and since natural selection is the survival of the fittest, those that were born with favorable traits will survive and reproduce.

5. Geographic isolation.

6. A new species could form because there is no guarantee that the rabbits have the traits necessary to survive. If one with them reproduces, then there's a chance that a new species will be created eventually.

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Answer:

2 carbon atoms/molecules are present on the reactant side.

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Answer:

[tex]\frac{1}{6}[/tex]

Explanation:

Molar ratio is defined as the ratio of number of moles of reactants or products in a balanced chemical equation.

In this balanced equation, the number of C6H6 molecules react to form 12 CO2 molecules.

Thus, the molar ratio between C6H6 to  carbon will be equal to 2 moles of  C6H6 divided by 12 moles of CO2

[tex]\frac{2}{12}\\\frac{1}{6}[/tex]

Answer:

Electrical energy

Explanation:

Electrical energy is caused by the moving of electrons.

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Answer: The answer would be 85F  

Explanation: The odour molecules become airborne much more quickly in a warmer environment than a colder one. So the bottle of perfume to spread faster through the air faster when the room temperature is 85F

Answer:

I would choose to live on mars

Explanation:

I would choose to live on mars because not only is it the most habitable planet in our solar system other than Earth, there is enough gravity on Mars to be believed that our bodies can adapt. It is also not too hot or cold for us. There is soil that water can be extracted from, and we can also use solar panels to collect energy. Although we would have to use advanced technology when going there, but I think these are a few reasons why I would prefer living on Mars over the Moon.

Answer:

Water, and other neutral

Explanation:

That means those substances have pH = 7.

When the amount of H+ is more than the amount of OH- in solution, the substance is acidic ( eg.: Lemon juice ). pH < 7

When the amount of H+ is less than the amount of OH- in solution, the substance is basic ( eg.: Baking soda ). pH > 7

Answer:

c

Explanation:

Answer:

c

Explanation:

The breakdown of a larger molecule into a smaller molecule is called digestion. An enzyme is required for the digestion of biomolecules present in the food particles.

According to the question, the wrong option is C that is Nutrients are absorbed into the bloodstream.

Option A is correct as we stated above.

Option B is correct, the food is a mechanical breakdown to the smaller pieces by the teeth.

Option D is also correct because in the mouth both digestions took place.

Hence, the correct option to the question is C

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Answer: [tex]1.94\times 10^{-3}g[/tex] of NaOH

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

[tex]pH=-\log [H^+][/tex]

Putting in the values:

[tex]10.020=-\log[H^+][/tex]

[tex][H^+]=9.55\times 10^{-11}[/tex]

[tex][H^+][OH^-]=10^{-14}[/tex]

[tex][OH^-]=\frac{10^{-14}}{9.55\times 10^{-11}}=1.05\times 10^{-4}M[/tex]

[tex]NaOH\rightarrow Na^++OH^-[/tex]

[tex]Molarity=\frac{moles\times 1000}{\text {Volume in ml}}[/tex]

[tex]1.05\times 10^{-4}M=\frac{moles\times 1000}{463ml}[/tex]

moles = [tex]4.86\times 10^{-5}[/tex]

Mass of [tex]NaOH=moles\times {\text {Molar mass}}=4.86\times 10^{-5}\times 40=1.94\times 10^{-3}g[/tex]

Thus [tex]1.94\times 10^{-3}g[/tex] of NaOH is needed to prepare 463 mL of solution with a pH of 10.020

Answer:

250.656

Explanation:

find no of moles in the 600ml=3.36,find molar mass of kcl(35.5+39,if 1mole=74.6g what about 3.36moles

Explanation:

The building blocks of matter are called atoms

A substance made up of the same kind of atoms is called a element

unstable  elements lose particles

This makes them radioactive

(i dd the assignment)

The correct words are:

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Answer:

the red moon occurs during lunar eclipse

Explanation:

The reddish coloration arises because sunlight reaching the Moon must pass through a long and dense layer of Earth's atmosphere, where it is scattered

Answer:

A. 16 grams.

B. 4 mol.

Explanation:

A. To find the atomic weight of one mole of CH4, we can simply reference the periodic table and find the atomic weights of each element:

12.0+4(1.0)= 16.0 g.

B. To find the amount of moles in 64 grams, we can simply divide:

64.0÷16.0= 4 mol.

Answer:

The Sun powers life on Earth; it helps keep the planet warm enough for us to survive. It also influences Earth’s climate: We know subtle changes in Earth’s orbit around the Sun are responsible for the comings and goings of the past ice ages. But the warming we’ve seen over the last few decades is too rapid to be linked to changes in Earth’s orbit, and too large to be caused by solar activity

Explanation:

Answer:

The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

The amount of heat that a body receives or transmits is determined by the following expression:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

This expression indicates that between heat and temperature there is a direct proportional relationship.

In this case:

Replacing:

100 J= c*5 g* 30°C

Solving:

[tex]c=\frac{100 J}{5 g* 30C}[/tex]

c= 0.67 [tex]\frac{J}{g*C}[/tex]

The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]

the carbon cycle is the process in which carbon travels from the atmosphere into organisms and the earth and then back into the atmosphere

Answer:the objects will be about the same temperature as the room

Explanation:

Answer:

4. 1HCL + 1NAOH- I NACL+1H2O

Explanation:

there is 2 hydrogens on the left side of the equation, balancing out to the other side of the equation. everything else would be balanced out too

Answer: Lithium (Li)

Explanation:

Once it loses its only valence electron, there’s no longer a negative charge.

Answer:

M2=(6.0)(25.0)/500 =0.3

Explanation:

Answer:

heat = 229139.43 cal

Explanation:

given data

specific heat of iron is 0.107 cal/g-°C     C = 0.4494 J/g°C;

Mass of iron = 24.7 kg = 24700 g

temperature T1 = 880°C

temperature T2 = 13°C

solution

we know that Heat lost that is express as

heat loss = mcΔT      .........................1

here m is the mass and c is specific heat capacity of iron and ΔT is the change in temperature

so here change in the temperature is = 880°C - 13°C

change in the temperature = 867°C

so put here value and we get

heat  = 24700 × 0.107 cal/g-°C × 867°C

heat = 229139.43 cal

Answer:

D. the physical and chemical properties of the products are different from the reactants

Explanation: