Which of the following statements about energy is NOT TRUE?
O Energy is the ability to do work or cause change.
Energy can neither be created nor destroyed.
When you use energy, the total amount of energy decreases.
Energy can be changed from one form to another.

Answer:

Explanation:

number 12 is magnesium i think which is group lla which is B alkaline earths

Answer:

def don't understand that sorry

Answer:

67.0 g Lead (ll) Nitrate

Explanation:

first, find you mass for each element

Pb= 207 g

N=14 g

207(2)+14=428 g

now convert to grams using the standard moles conversion

0.270 moles (248 g/1 mole) = 66.96

round to the correct number of significant figures, 3.

66.96= 67.0 g

Answer:

B

Explanation:

sorry I have to write here

Answer:

a

Explanation:

i got it right

Answer:

Steps of the technological design process include: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and communicate the final solution.

Explanation:

hope it helps, please mark brainliest

Steps of the technology design process include: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and communicate the final solution.

Technology is the application of knowledge for achieving practical goals in a reproducible way.The word technology can also mean the products resulting from such efforts, including both tangible tools such as utensils or machines, and intangible ones such as software. Technology plays a critical role in science, engineering, and everyday life.

Technological advancements have led to significant changes in society. The earliest known technology is the stone tool, used during prehistoric times, followed by the control of fire, which contributed to the growth of the human brain and the development of language during the Ice Age. The invention of the wheel in the Bronze Age allowed greater travel and the creation of more complex machines. More recent technological inventions, including the printing press, telephone, and the Internet, have lowered barriers to communication and ushered in the knowledge economy.

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Answer:

The wavelength is 7.0x10⁻⁴⁷ m

Explanation:

To solve this problem we can use the equation:

Where:

We put the data given by the problem:

And solve for λ:

She will create a solution.

Answer:

1.)[tex]Al_{2} O_{3}[/tex]

2.) [tex]Li_{3} N\\[/tex]

3.) 2HCl

4.) MgO

5.) Mg and [tex]O_{2}[/tex]

6.) [tex]H_{2}[/tex] and [tex]O_{2}[/tex]

7.)Na and [tex]Br_{2}[/tex]

8.) 3 aluminums and 3 chlorides

Explanation:

Answer:

E = 1.89×10⁻¹⁹ J

Explanation:

Given data:

Wavelength of photon = 105 nm (105 ×10⁻⁹ m)

Energy of photon = ?

Solution:

Formula:

E = hc/λ

h = plancks constant = 6.63×10⁻³⁴ Js

c = speed of wave = 3×10⁸ m/s

by putting values,

E =  6.63×10⁻³⁴ Js ×3×10⁸ m/s / 105 ×10⁻⁹ m

E = 19.89×10⁻²⁶ J.m / 105 ×10⁻⁹ m

E = 0.189×10⁻¹⁷ J

E = 1.89×10⁻¹⁹ J

The answer i got was C so I would pick C

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{1.68 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 2.790697 ...[/tex]

We have the final answer as

Hope this helps you

Explanation:

When water changes state from liquid to gas, this is Evaporation. (C)

When you apply heat to liquid water it will convert into gas. This process is called evaporation.

A. Zn²⁺

Given

Cations of several elements

Required

The least to be reduced

Solution

If we look at the voltaic series:

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au

The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)

The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)

Or you can look at the standard reduction potential value of the metals in the answer options, and the most negative reduction E° value which will be difficult to reduce.

The Zn metal is located far left of the other metals in the answer choices, so it is the most difficult to reduce

The temperature for the can explode : 627 °C

Gay Lussac's Law  

When the volume is not changed, the gas pressure is proportional to its absolute temperature  

[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]

T₁=27 C+273=300 K

P₁=30 psi

P₂=90 psi

[tex]\tt T_2=\dfrac{P_2\times T_1}{P_1}\\\\T_2=\dfrac{90\times 300}{30}\\\\T_2=900~K=627^oC[/tex]

The mass of Aluminum tri bromide that can be made with 5.6 moles of Aluminum is 1,492.90 grams.

Relation between the mass and moles of any substance will be calculated by using the below equation as:

n = W/M, where

Given chemical reaction is:
2Al + 3Br₂ → 2AlBr₃

From the stoichiometry of the reaction, it is clear that:

Now mass of AlBr₃ will be calculated by using the above equation as:

W = (5.6mol)(266.59g/mol) = 1,492.90g

Hence required mass of AlBr₃ is 1,492.90g.

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Answer:

Mass = 713.4 ×10⁻⁴ g

Explanation:

Given data:

Number of moles of calcium phosphate = 2.3×10⁻⁴ mol

Mass of calcium phosphate = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of calcium phosphate is 310.18 g/mol

by putting values,

2.3×10⁻⁴ mol = mass / 310.18 g/mol

Mass = 2.3×10⁻⁴ mol × 310.18 g/mol

Mass = 713.4 ×10⁻⁴ g

Answer:

The answer is wave

Explanation:

Answer:

atmospheric circulation

Explanation:

Atmospheric circulation occurs  because the Sun heats the Earth more at the equator than at the poles.

Warm air is known to rise at the tropics which lies closer to the equator and moves towards the poles. Atmospheric circulation is driven by the rotation of the earth.

The air cools and flows back towards the Equator to be warmed up again. A sort of convection current is thereby set up.

Answer:

Deandre is correct.

Explanation:

When shiny pennies turn dull, due to getting rust. It gets cover with a layer of black or brown color on its surface on the exposure of air.

In this problem,

Deandre says, "I think they turn dull because they're exposed to the air over time." Jamie says, "I think they turn dull because they get dirt on them from being dropped on the ground." Selina says, "I think there is dull metal inside the penny the entire time.

Out of three friends, Deandre is correct. Shiny pennies turn dull because they're exposed to the air over time.

Answer:

1. the reaction rates can not decrease

2. correct!

3. correct!

4. decreasing the amount of reactants

5. correct!

Explanation:

good luck!

Answer:

Ksp = 2.74 x 10⁻⁵

Explanation:

The solubility equilibrium for Ca(OH)₂ is the following:

  Ca(OH)₂(s) ⇄ Ca²⁺(aq) + 2 OH⁻(aq)

I                          0                0

C                       + s               + 2s

E                        s                   2s

According to the ICE table, the expression for the solubility product constant (Kps) is:

Ksp = [Ca²⁺] x ([OH⁻])² = s x (2s)² = 4s³

Then, we calculate Ksp from the solubility value (s):

s = 0.019 M

⇒ Ksp = 4s³ = 4 x (0.019)³ = 2.74 x 10⁻⁵

The Ksp value of Ca(OH)2 is [tex]2.74 \times 10^-^5[/tex].

The Ksp is the solubility product constant.

The solubility equilibrium is

[tex]Ca(OH)_2(s) = Ca^2^+(aq) + 2 OH^-(aq)[/tex]

I                     0                  0

C                     s               +2s

E                     s                 2s

By the ICE table, the expression for Ksp is

[tex]\rm Ksp = [Ca^2^+] \times ([OH^-])^2 = s \times (2s)^2 = 4s^3[/tex]

Now, calculate the Ksp

s, solubility value is 0.019 M

then, [tex]\rm Ksp = 4s^3= 4 \times (0.019)^3 = 2.74 \times 10^-^5[/tex]

Thus, the Ksp value is [tex]2.74 \times 10^-^5[/tex]

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Answer:

C help stop bleeding

Explanation:

Platelets stop bleeding by clumping and forming plugs in blood vessel injuries

Answer:

C

Explanation:

To hello fight disease

Answer:

D Earth's hot interior

Explanation:

The internal heat engine of the earth is the energy source that powers plate movement.

The sun drives the surface process and provides energy for the external heat engine

Therefore, the heat is used to melt rocks and set up convection currents that drives plate movements.

Answer: 3915 K ​(3642 °C, ​6588 °F)

Answer:

8,721°F

OR

4,827°C.

Explanation:

Good Luck!

Answer:

4. O^2-

Explanation:

O^2 has 16 electrons, while Ne has 18 electron. O^2- is a molecule that has one electrons added to each atom, meaning that there are two extra electrons. Which makes O^2 the same electron configuration as an atom of neon.

The ions having same electronic configuration as neon are Calcium, oxygen, and chlorine ion. Thus, options 1, 2, and 4 are correct.

The electronic configuration has been defined as the electron address in a atom. The electronic configuration has been based on the quantum rule for the filling of the electrons.

The number of electrons present in Neon has been 18. Thus, the ion with the presence of 18 electrons has same electronic configuration as Neon.

The number of electrons in the following ions are:

[tex]\rm Ca^{2+}=18\\Cl^-=18\\Li^+=4\\O_2^{-}=18[/tex]

The number of electrons of calcium ion and chlorine ion are similar to the number of electrons of Ne. Thus the ions having same electronic configuration as neon are Calcium, oxygen and chlorine ion. Thus, options 1, 2, and 4 are correct.

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Answer:

what are the options to the question

Answer:

b and c

Explanation:

just took it on edge :)

Answer:

Digestive system

Explanation:

..........