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Answer:

the Paleozoic Era

Explanation:

Answer:

What is the average height of a human?

5.6 ft.

5.2 ft.

Human/Height

Image result for Give me an example of an average. For instance, "the average height of a person is about 5 foot 6 inches

However, the actual global average height of a woman is only 159.5 cm (5 ft 2.8 in) and the average height of a man is 171 cm (5 ft 7.3 in). Therefore, the height difference between men and women globally is about 4.5 inches or 12 centimeters.

Explanation:

Answer:

Mass(m) = 4kg. Weight of m on surface of earth = 39.2N

Answer:

Convection occurs in liquids and gases.

Convection transfers thermal energy.

Explanation:

Answer:

A

Explanation:

I think it is A because a dinosaurs are extinct so it wold be possible to find a dinosaur fossil in the coal mine.

Hey there,

Given - Is UF6 a covalent compound or an ionic compound?

Answer- Covalent compound

Reason - Even though, still a subject of debate, theoretical results indicate that the U–F bond is partially covalent and could even possess some multiple bond characters, resulting from F → U π interaction cause.

~ Benjemin360

Answer:

45

Explanation:

the answer is 45 due to the calculation of the master calculation

Answer:

mNaNO3 =765g

Explanation:

First, we write the balanced chemical equation representing the chemical reaction that happened between aluminum nitrate and sodium chloride.

Balanced chemical equation:

AL(NO3)3+3NaCl ⟶ 3 NaNO3+AlCl3

According to the equation, each mole of aluminum nitrate requires three moles of sodium chloride. Thus, the required number of moles of sodium chloride is

4 Mol ⋅ 3 = 12mol

Based on the data provided in the table, there were 9 moles of sodium chloride used in the reaction, which was not enough for the entirety of aluminum nitrate to react. So, sodium chloride must have been the limiting reactant.

Therefore, we use the number of moles (n) of sodium chloride to calculate the number of moles of sodium nitrate, which has a 1:1 ratio with sodium chloride.

Number of moles sodium nitrate:

nNaNO3=nNaCl

nNaNO3 = 9 mol

We can also calculate the mass (m) of sodium nitrate that was produced by multiplying its number of moles by its molar mass (MM), 85.00g/mol.

Mass of sodium nitrate produced:

mNaNO3 = nNaNO3 ⋅ MMNaNO3

mNaNO3 = 9 mol ⋅ 85.00 g/mol

mNaNO3 =765g

The proportion of oxygen to hydrogen by mass in the water is 8 : 1

18 g of water contains 16 g of O.

Therefore,

2.16 g of water will contain = (2.16 × 16) / 18 = 1.92 g of O

Mass of H = mass of water – mass of O

Mass of H = 2.16 – 1.92

Mass of H = 0.24 g

Proportion = oxygen / hydrogen

Proportion = 1.92 / 0.24

Proportion = 8 : 1

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We are given –

__________________________________________

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf 39.09 +18.99[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf 58.08[/tex]

Using formula –

[tex]\qquad[/tex] [tex]\purple{\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{ W}{MV}}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{ 1}{58.08\times 0.10}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{1}{5.808}[/tex]

[tex]\qquad[/tex] [tex]\purple{\twoheadrightarrow\bf Molarity _{(Solution)} = 0.1722M} [/tex]

___________________________________________

Answer:

1.1328 g left after 15.6 years

Explanation:

First we need to find, that how many times it decays: 15.6 ÷ 2.60 = 6 times

Then we know the formula: mass of original ÷ 2^n = remaining mass.

                                           :     72.5   ÷   2^6 = 1.1328 g left.

Answer:

remaining mass = 1.13 grams (3-sig figs)

Explanation:

All radioactive decay follows 1st order kinetics and is defined by the expression ...

A = A₀e^⁻kt

A = final mass activity

A₀ = initial mass activity

k = rate constant = 0.693/t(half-life) = 0.693/2.60 yrs = 0.2665 yrs⁻¹

t = time of decay = 15.6 yrs

A = (72.5 g)(e^[-(0.2665 yrs⁻¹)(15.6yrs)] = 72.5 grams x 0.0156

= 1.13381331 grams (calc. ans.) ≅ 1.13 grams (3 sig figs)

Answer:

1.059 x 10^24 formula units

Explanation:

103/58.44 = 1.76 moles NaCl

1.76 x 6.022 x 10^23 = 1.059 x 10^24

Answer:

D

Explanation:

Answer:

1. a = 2, b = 1 and c = 2

2. a = 1, b = 3, c = 2 and d = 2

Explanation:

According to law of conservation of mass, the mass can neither be created nor destroyed.

Hence, for a chemical equation the left hand side should be equal to the right hand side.

Therefore, the two balanced equations are;

2 CO + O₂ → 2 CO₂

C₂H₄ + 3 O₂ → 2 CO₂ + 2 H₂O

Answer:

Adenitis: Inflammation of a lymph gland. From the aden-, gland + -itis, inflammation.

Inflammation of the gland can be defined by the term adenitis. Thus, option c is correct.

Inflammation is the body's immune response to an infection or an injury. This causes the white blood cells (leukocytes) of the body to move to the affected area or the tissue and results in swelling and redness.

The hardening of the gland is defined by adenosclerosis, the benign tumor of the glands is referred to as adenoma, whereas, cancer of the glands is referred to as adenocarcinoma.

In the word, adenitis, aden- is used to refer to the glands, and -itis defines inflammation. Hence, adenitis is used to define the inflammation of the glandular region.

Therefore, option c. adenitis is referred to as inflammation of the glands.

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Answer:

true because the ice freezes the top water and then freezes the water on the bottom of the lake.

The frequency factor from the calculation is 7.1 × 10^25.

The Arrhenius theory holds that the reaction between molecules owes to the collision between the reactant species. The reacting molecules must posses energy in excess of a minimum amount called the activation energy.

From the theory;

k = A e^-Ea/RT

k = rate constant

A = collision factor

Ea = activation energy

R = gas constant

T = Absolute temperature

5.8 × 10–6 = Ae^-(265 × 10^3/8.314 × 460)

A = 5.8 × 10^–6/8.1 × 10^-31

A = 7.1 × 10^25

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Answer:

it has 7 significant figures

Explanation: hope this helps<3

Answer:

Explanation:

The mechanical properties of a material affect how it behaves as it is loaded. The elastic modulus of the material affects how much it deflects under a load, and the strength of the material determines the stresses that it can withstand before it fails

Answer:

penultimate or senile stage

Explanation:

Answer: [tex]2.1 * 10^7[/tex]

Explanation: To find things in scientific notation you basically just move the decimal point so that the number is in the one's place. The exponent is the number of times you moved the decimal place. Ex. 0.000003467 would be 3.467 * 10^-6 because you moved the decimal point six times to the right.

Answer: Both images seem to represent hail and ice, these conditions are only brought by chilly temperatures and rain.

[tex]\qquad[/tex] ☀️[tex]\pink{\bf{ {Answer = \: \: C_3H_6O_3 }}} [/tex]

For this question –

Now, let's find out value of n. Where–

[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf n = \dfrac{ Molar \:Mass }{Empirical \:Mass }} [/tex]

Empirical Mass of [tex]\bf CH_2O [/tex]–

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf 12 + 1×2 + 16[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf 30 [/tex]

Now, we are given, mass of compound is 90.07 g/mol.

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf n = \dfrac{ Molar\: Mass }{Empirical\: Mass } [/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf n = \dfrac{90.07}{30}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf n = \cancel{ \dfrac{90.07}{30}}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf n = 3.0023[/tex]

[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf n = 3 }[/tex]

Molar formula will be –

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf {( CH_2O)}_n [/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf {( CH_2O)}_3[/tex]

[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\sf C_3H_6O_3}[/tex]

The molecular formula of a compound whose empirical formula is CH20, is C3H6O3.

The molecular formula of a compound can be calculated from the empirical formula as follows:

Empirical formula = CH2O.

(CH2O)n = 90.07g/mol

(12 + 2 + 16)n = 90.07

30n = 90.07

n = 3.00

If n = 3, the molecular formula of the compound will be (CH2O)3 = C3H6O3.

Therefore, molecular formula of a compound whose empirical formula is CH20, is C3H6O3.

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Answer:

Places that get more solar energy have more heat. Places that get less solar energy have less heat. The air above the areas receiving more heat warms up and rises. Because of this, the air, ocean, and Earth's surface gets heated at the equator more than at the poles.

Explanation:

Answer:

no

Explanation:

The poles receive less energy than the equator, hence the poles being colder than the equator.

Based on the information given, it should be noted that sound travels through air, and putting your ear to a wall will not allow the person to hear the noise on the other side better. Therefore, it is false.

It should be noted that when sound is created, the air particles vibrate and collide with each other. The vibrating particles pass the sound through to a person's ear and then vibrate in the eardrum.

Sound travels through air, and putting your ear to a wall will not allow the person to hear the noise on the other side better. In such a case, the noise will be better heard when it travels through the air.

In conclusion, sound needs a medium such as air to travel.

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Explanation:

I think it's Al(OH)3 its amphoteric in nature with chemical name Aluminium hydroxide.

hope this helps you

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Answer:

B. The amount of vegetation decreases.

Explanation:

plants can't grow without rain