Which statement about the surface of the moon is true?
o There is water and air, but no life on the moon's surface.
O There is no air, wind, liquid water or life on the moon's surface.
There are liquid seas on the moon's surface.
It is very windy on the moon's surface.

Answer:

(a) 140 years

(b) 3.125 pounds

Explanation:

QuestIons

(a) How long is five half-life

(b)  How much radioactive strontium is left after five half-life

Given that:

Half-life is about 28 years; &

There are 100 pounds of this radioactive waste

Five half-life will be;

= 28 × 5

= 140 years

The amount of radioactive remaining after five half-life is:

[tex]= 100 \times( \dfrac{1}{2}) ^5[/tex]

= 100 × 0.03125

= 3.125 pounds

Answer: Both of these are of great concern to human health. BPA is used in many things including plastic bottles and food packaging materials. Over time the polymer chains of BPA break down, and can enter the human body in many ways from drinking contaminated water to eating a fish that is exposed to the broken down toxins.

Explanation:

I think you will get it

Answer:

3P2O5:

P:6 O:15

5CO2

C:5 O:10

3C6H12O6

C:18 H:36 O:18

4C6H12

C:24 H:48

3Mg3(PO4)2

Mg:9 P:2 O: 8

4(NH4)2S

N:8 H:32 S:4

Answer:

hydrogen atom but see the note below.

Explanation:

This is either the most common hydrogen ion or a hydrogen atom. It cannot be either of hydrogen's isotopes.

Answer:

I assume air pollution.

Explanation:

If you incinerate something, usually fire or some kind of heating element is used. A byproduct of fire and/or burning is smoke, which can pollute the air.

Answer:

A. Air pollution

Explanation:

In the incineration Factories they produce items And Air pollution

The atomic weight of Aluminum (AL) is 26.98. It has 14 neutrons. Aluminum has  an atomic number 13. Therefore, option B is correct.

The atomic number of an element represents the number of protons in the nucleus of its atoms. Since the atomic number of an element is unique and determines its position in the periodic table, aluminum has an atomic number of 13.

The number of electrons in a neutral atom is equal to the number of protons, which in this case is 13. Therefore, aluminum has 13 electrons.

The atomic weight of aluminum (Al) is 26.98, which represents the weighted average mass of all the naturally occurring isotopes of aluminum, taking into account their relative abundances. The number of neutrons in an atom of aluminum is given as 14.

Thus, the correct option is B.

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Answer: c (the amount of empty space between the water particles will decrease)

Explanation: i got it right:)

Answer:

false

Explanation:

Answer:

hi buddy!! here is ur ans: carbon atoms

Answer:?

Explanation: i'm confused with this and i know i should be writing this in comments but if you can explain me the question maybe i could help you

Answer: D. Potassium bromide

Answer:

1 Answer. 1 mole of ferric sulfate contains 2 moles of iron, and 12 moles of oxygen atoms, and three moles of sulfate ions.Sep 29, 2016

Explanation:

Answer: No because a solution is a homogeneous MIXTURE of two or more substances. Water is a pure substance. It is made of hydrogen and oxygen, but shares none of their properties. So it’s pure.

Explanation:

Answer:

The answer is 3 :)

Answer: 3. a bottle that was broken into many small pieces

Explanation:

the object must be at rest

Answer:Cellular respiration is not the same as breathing, but they are closely related

Explanation: When you breathe in, you take in the oxygen your cells need for cellular respiration. When you breathe out, you get rid of carbon dioxide that your cells produce during cellular respiration.

Answer:

Explanation:

2.2 g/mL is the answer.

Answer:

See the answer below

Explanation:

The formula for calculating power is such that;

  power = work/time

Two ways to restate the relationship between the 3 variables would be to make time and work the subject of the formula respectively.

1. When time if made the subject of the formula;

 time = work/time

2. When work is made the subject of the formula;

work = power x time

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic. The given substance is acidic. The correct option is option A.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base are the solution which releases hydroxide ion OH⁻ ion when dissolved in water. The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

Therefore, the given substance is acidic.  The correct option is option A.

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Answer:

An electrical phenomenon is caused by flow of free electrons from one atom to another. The characteristics of current electricity are opposite to those of static electricity. Wires are made up of conductors such as copper or aluminum.

Explanation:

from google

Answer:

Coal

Explanation:

Coal is by far the worst emitter, followed by natural gas, with solar, wind and nuclear all low-carbon.

Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.

Energy sources refers to the various sources in which energy for man's needs are obtained.

There are two types of energy sources:

The non-renewable energy sources such as coal release large amounts of carbon dioxide until The atmosphere.

Therefore, Coal, a non-renewable energy source releases the most carbon dioxide into the atmosphere.

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Answer:

a. Kw = 1.0 × 10⁻¹⁴

Explanation:

a. Let's consider the self-ionization of water.

2 H₂O(l) ⇄ H₃O⁺(aq) + OH⁻

The ion-product of water (Kw) at 25 °C is:

Kw = [H₃O⁺][OH⁻] = 1.0 × 10⁻¹⁴

c. Considering [H⁺] = [H₃O⁺] = 4.0 × 10⁻⁹ M, the concentration of OH⁻ is:

[OH⁻] = 1.0 × 10⁻¹⁴/[H₃O⁺] = 2.5 × 10⁻⁶ M

b. We can calculate the pOH using the following expression.

pOH = -log [OH⁻] = -log 2.5 × 10⁻⁶ = 5.6

d. We can calculate the pH using the following expression.

pH = -log [H⁺] = -log 4.0 × 10⁻⁹ = 8.4

When [H+] = 4.0 × 10–9 M in water at 25°C, then the [tex]Kw =1.0\times 10^-^1^4.[/tex]

Kw is the dissociation constant or ionization constant of water.

The self-ionization of water will be

[tex]\rm 2 H_2O(l) = H_3O^+(aq) + OH^-[/tex]

The dissociation constant of the water at 25°C will be

[tex]\rm Kw = [H_3O^+][OH^-] = 1.0 \times 10^-^1^4[/tex]

Thus, the correct option is a. [tex]Kw =1.0\times 10^-^1^4.[/tex]

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Using magnesium ribbon instead of powdered magnesium decrease the rate of reaction between magnesium and air.

Rate of reaction tells about the duration of the completion of the reaction.

Rate of any reaction is directly proportional to the concentration and surface area of the reactant, temperature, catalyst, no. of collision, activation energy, etc.

So, if we magnesium in the ribbon instead of powdered magnesium the surface area of the reactant side decreases which results in the decrease of the rate of reaction.

Hence, option (D) is correct i.e. rate of reaction decreases on using magnesium ribbon instead of powdered magnesium.

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Answer:

.

Explanation:

1. aluminum

2. argon

3. phosphorus

4. francium

I cant really explain this one

Answer:

Cell --> Tissues --> Organs ---> Organ System ---> Organism

Answer:

Explanation:

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

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

From the question we have

[tex]density = \frac{12.5}{1.35} \\ = 9.259259...[/tex]

We have the final answer as

Hope this helps you