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The biggest disadvantage of using nuclear power to produce electricity is the nuclear waste must be safely stored for many years.

Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from:

Nuclear reactions produces high amount of energy and many waste materials which are non degradable and will stay in the environment for the long time.

Hence, nuclear waste must be safely stored for many years.

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Answer:it is D

Explanation: it is only one that makes sense

Answer:

Record players

Explanation:

In a record player, a stylus vibrates as it follows a spiral groove cut into the surface of the rotating record.

The vibrations (analogue) are converted into electrical signals and fed into an amplifier to produce the sounds you hear

Fiber optic cables, Wi-Fi devices, and flat screen TVs use digitized signals to encode and transmit information

Answer:

A) number of electrons

Explanation:

A calcium atom has 20 electrons while a calcium ion has 18 electrons since it loses 2 electrons to form a stable octet structure. The formula of a calcium ion is Ca2+.

The number of protons does not change, neither do the number of neutrons. Atomic number is the proton number which is equals to the number of protons, hence B and C is wrong. Mass number is the number of protons and neutrons. Hence it doesnt change too and D is wrong.

Only the number of electrons change when an atom forms an ion.

Answer:

Do you still need this answer? If you do i can provide it for you still

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Answer:

The term "pseudo-science" assumes a criterion that allows a differentiation between science and nonscience, good science and bad science, true and false. ... They must try to understand them and not put out in television programmes the sort of pseudo-science that does not exist in reality

Explanation:

Explanation:

it means false science

Answer:

natural selection

Explanation:

it is a biological selection of genes, whether dominant or negative.

Answer:

b

Explanation:

it is right

Answer:

2H on 3H

Explanation:

it's because Mario eh, eh, eh. now back of and habeba goodnday

Answer:

[tex]\large \boxed{\text{0.44 g}}[/tex]  

Explanation:

1. Calculate the molar mass of ammonia

1  N = 1 × 14.01    g = 14.01    g

3 H = 3 ×  1.008 g =  3.024     

                   TOTAL = 17.03   g

2. Calculate the mass of hydrogen

So, there are 3.024 g of H in17.03 g of NH₃.

The conversion factor is either

[tex]\dfrac{\text{3.024 g H}}{\text{17.03 g NH}_{3}} \text{ or } \dfrac{\text{17.03 g NH}_{3}}{\text{3.024 g H}}[/tex]

We want to find grams of H, so we choose the one with grams of H on top.

[tex]\text{Mass of H} = \text{2.5 g NH}_{3} \times \dfrac{\text{3.024 g H}}{\text{17.03 g NH}_{3}} = \textbf{0.44 g H}\\\\\text{The mass of H is $\large \boxed{\textbf{0.44 g}}$}[/tex]

Answer:

Magnets stick to the fridge door because, underneath the paint, the door is made of steel. Magnets are attracted to certain metals, and if the attraction is strong enough they can hold on even when upside down. ... This means that a magnet will always be attracted to the door. But an iron nail does not have any magnetic properties. So it doesnt get attracted.

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A small magnet will stick to a refrigerator door, but a nail will not stick

because magnets attract certain types of metals.

Magnets have a strong magnetic field which is why it attracts metals such

as iron and steel. The refrigerator must have been made with iron or steel

which was why the magnet stuck to it.

Metals such as aluminium and copper aren't attracted by magnets which is

why the nails weren't attracted as a result of it being made with metals which magnets don't attract.

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Answer:

ionic

Explanation:

Answer:

By using the speed of sound in water

Explanation:

(Which is about 1500 m/s in sea depending on the sea water density )

Answer:

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

Explanation:

Molarity is a measure of the concentration of a solute in a solution that indicates the amount of moles of solute that appear dissolved in one liter of the mixture. In other words, molarity is the number of moles of solute that are dissolved in a given volume.

The Molarity of a solution is determined by the following expression:

[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex]

In this case:

Replacing:

[tex]1.56 M=\frac{Number of moles of calcium chlorine}{2.657 liters}[/tex]

Solving:

Number of moles of calcium chlorine= 1.56 M* 2.657 liters

Number of moles of calcium chlorine= 4.14 moles

In other side, you know:

Then the molar mass of the calcium chloride CaCl₂ is:

CaCl₂= 40 g/mole + 2* 35.45 g/mole= 110.9 g/mole

Now it is possible to apply the following rule of three: if in 1 mole there is 110.9 g of CaCl₂, in 4.14 moles of the compound how much mass is there?

[tex]mass=\frac{4.14 moles*110.9g}{1 mole}[/tex]

mass= 459.126 g

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

Answer:

120 g SO3

Explanation:

128 g SO2  -> 160 g SO3

 96 g SO2  -> x

x= (96 g SO2 * 160 g SO3)/128 g SO2

x= 120 g SO3

The mass of sulfur trioxide, SO₃, formed is 120 g

The balanced equation for the reaction is given below:

Next, we shall determine the mass of SO₂ that reacted and the mass of SO₃ produced from the balanced equation. This can be obtained as follow:

Molar mass of SO₂ = 32 + (16×2)

= 32 + 32

= 64 g /mol

Mass of SO₂ from the balanced equation = 2 × 64 = 128 g

Molar mass of SO₃ = 32 + (16×3)

= 32 + 48

= 80 g /mol

Mass of SO₃ from the balanced equation = 2 × 80 = 160 g

Thus,

From the balanced equation above,

128 g of SO₂ reacted to produce 160 g of SO₃.

Finally, we shall determine the mass of SO₃ by the reaction of 96 g of SO₂. This can be obtained as follow:

From the balanced equation above,

128 g of SO₂ reacted to produce 160 g of SO₃.

Therefore, 96 g of SO₂ will react to produce = [tex]\frac{96 X 160}{128}\\\\[/tex] = 120 g of SO₃.

Therefore, the mass of SO₃ formed is 120 g

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Answer:

[tex]\rm _{27}^{60}\text{Co} \longrightarrow \, _{-1}^{0}\text{e} + \, _{28}^{60}\text{Ni}[/tex]

Explanation:

The unbalanced nuclear equation is

[tex]\rm _{27}^{60}\text{Co} \longrightarrow \, _{-1}^{0}\text{e} + \, ?[/tex]

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

[tex]\rm _{27}^{60}\text{Co} \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

60 = 0 + A, so A = 60 - 0 = 60, and

27 = -1 + Z, so Z  = 27 + 1 = 28

Your nuclear equation becomes

[tex]\rm _{27}^{60}\text{Co} \longrightarrow \, _{-1}^{0}\text{e} + \, _{28}^{60}\text{X}[/tex]

Element 28 is nickel, so the balanced nuclear equation is

[tex]\rm _{27}^{60}\text{Co} \longrightarrow \, _{-1}^{0}\text{e} + \, _{28}^{60}\text{Ni}[/tex]

Answer:

True statements: B and C

Explanation:

A is not true NaCl is product

D is not true the reaction occurs

Answer:

1. sublimation

2.melting

3.melting  

4.sublimation

Explanation:

melting is a process when solid changes to liquid

Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.

Answer:

a. 0.0855 M

b. 0.153 M

c. 0.0351 M

d. 0.0901 M

Explanation:

a.

Molar mass NaCL= 23.0 +35.5 = 58.5 g/mol

10.0 g* 1 mol/58.5 g = 10.0/58.5 mol

(10.0/58.5) mol/2L = 0.0855 mol/L = 0.0855 M

b.

Molar mass (C12H22O11) =342.3 g/mol

52.5 g*1mol/342.3 g = 52.5/342.3 mol=0.153 mol

0.153 mol/1L = 0.153 M

c.

Molar mass (Al2(SO4)3) =342.2 g/mol

120g* 1 mol/342.2 g =0.351 mol

0.351 mol/10.0L = 0.0351 mol/L = 0.0351 M

d.

Molar mass (C8H10N4O2) = 194.2 g/mol

1.75 g*1mol/194.2 g = 0.00901 mol

0.00901 mol/0.100 L =0.0901 M

Answer:

D.

Explanation:

It would not be gain because it would say +6 instead of -2. Having a -2 charge means it wants to loose 2 electrons so it can form a full shell of 8 electrons. It wants to be inert (stable).

- Hope that helps! Please let me know if you need further explanation.

Answer: c

Explanation: an xray wave does have a higher frequency than an infrared wave.

Answer:

Explanation:c

Answer:

natural selection (directional selection).                                    

Explanation:

Natural selection: In biology, the term "natural selection" is described as one of the central concepts associated with evolution. Through the process of natural selection, different organisms having favorable traits are most likely to reproduce. However, these organisms then pass the given traits to their next or coming generation. The process of natural selection allows different organisms to adapt to their specific environment.

Directional selection is considered as one of the different modes of natural selection.

In the question above, the given statement represents a natural selection.

Answer:

The answer is NaOH

Explanation:

Strong bases are characterized by the fact that they dissociate completely in an aqueous solution. In this case, sodium hydroxide, NaOH, is classified as a strong base because it dissociates completely in an aqueous solution to form sodium cations, Na+, and hydroxide anions, OH−. Also, it is strong because it totally breaks in its ion. And the base which breaks totally in its atom called the strong base and which doesn't it that is a weak base.

Answer:

NaOH

Explanation:

Got it right in the test. Please mark as brainliest

Answer:

The correct answer is (B) 0.50 g/mL

Explanation:

The density of a subtance is equal to the ratio between its mass and its volume, as follows:

d = m/v

In the problem, the mass is equal to 80.0 g. The volume is given by the increment in volume in the graduated cylinder when the solid is placed because the solid is insoluble so it displaces the liquid and increases the volume. The initial volume was 40.0 ml and the final volume was 80.0 ml, so:

V = Final volume - initial volume = 80.0 ml - 40.0 ml = 40.0 ml

Finally, we calculate the density by dividing the mass into the volume:

[tex]d= \frac{m}{v} = \frac{80.0 g }{40.0 ml} = 0.50 g/ml[/tex]

Answer:

when heat gets transferred through electromagnetic waves that move through

space

Explanation:

Radiation refers to the movement of energy through space without a material medium of propagation.

Electromagnetic waves have the ability to travel through space without a material medium for propagation. For instance, the rays from the sun reach us on earth without any intervening medium. Heat from a furnace can affect an object some distance away from the furnace without an intervening medium.

These are all examples of radiation. Energy is propagated through space without the intervention of any material medium.

Answer: 26.1 C

Explanation: Trust me

Answer:26.1

Explanation:

I did the ck12