What goes in the rest?

Answer:

D

Explanation:

total mass should be equal on both sides

it's a double do displacement reaction

HCl + NaOH --> NaCl + H2O

Answer:

Expanding earth and contracting earth

Explanation:

Answer:

A and C

Explanation:

Answer:

They could cause an organism and population and species to die.

Explanation:

If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides

Answer:

N for chlorate ion is one

Explanation:

Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons

Answer: 26

Correct Answer

Answer:

Jeweler B = more accurate

Jeweler A = more precise

Error:

0.008, 0

% error :

0.934% ; 0

Explanation:

Given that:

True mass of nugget = 0.856

Jeweler A: 0.863 g, 0.869 g, 0.859 g

Jeweler B: 0.875 g, 0.834 g, 0.858 g

Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864

Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556

Accuracy = closeness of a measurement to the true value

Accuracy = true value - official measurement

Jeweler A's accuracy :

0.856 - 0.864 = - 0.008

Jeweler B's accuracy :

0.856 - 0.856 = 0.00

Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.

However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.

Error:

Jeweler A's error :

0.864 - 0.856 = 0.008

% error =( error / true value) × 100

% error = (0.008/0.856) × 100% = 0.934%

Jeweler B's error :

0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)

% error = 0%

Answer:

O chemical change  because a temperature change was observed, which indicated that the water

Explanation:

I have taken this class

Answer:

D. all of the above.

Explanation:

The kinetic-molecular theory of gases suggests that; the particles of a gas move independently of each other, the particles in a gas move rapidly, the particles in a gas are far apart.

Hope it helps.

Answer:

Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..

Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of  will be -2, -1, 0, +1, +2.

Answer:

Principal Quantum Number: designates the principal electron shell. Angular Momentum Quantum Number-This quantum number determines it's shape of an orbital and thus it's angular distribution. This quantum number determines the number of orbital numbers, their orientation within the sub-shell.

Principal Quantum Number, n

It describes the size of its orbital and of the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..  

ngular Momentum Quantum Number l

It describes the shape of the orbital and thus the angular distribution. It can take  from 0 to (n - 1). That is l = 0,1,2,...,(n - 1)

The magnetic Quantum Number, m  

It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of  will be -2, -1, 0, +1, +2.

Explanation:

Answer:

A. 210 cm³

B. 10.5 cm³

Explanation:

It is important for us to note that air contains 21% of oxygen, O2. With this idea in mind, let us answer the questions given above.

A. Volume of air = 1000 cm³

Volume of O2 in air =.?

Percentage composition of O2 in air = 21%

Volume of O2 = 21% x 1000

Volume of O2 = 21/100 x 1000

Volume of O2 = 210 cm³

Therefore, the volume of O2 in 1000 cm³ of air is 210 cm³.

B. Volume of air = 50 cm³

Volume of O2 in air =.?

Percentage composition of O2 in air = 21%

Volume of O2 = 21% x 50

Volume of O2 = 21/100 x 50

Volume of O2 = 10.5 cm³

Therefore, the volume of O2 in 50 cm³ of air is 10.5 cm³.

Answer:

c) They have different charges but the same mass.

Explanation:

The atoms have a different charge from each other because one atom has one more electron than the other. They have the same mass because the number of protons and neutrons are the same in both atoms.

The given atoms have different charges and masses. So the correct option is D.

The amount of matter that makes up an element's atom, or atomic mass. It is stated as a multiple of 1.992646547 × 10⁻²³ grams, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. One atomic mass unit (amu), on this scale, is equal to 1.660539040 × 10⁻²⁴ grams. The dalton (Da) is another name for the atomic mass unit that honors the English chemist John Dalton.

The total mass of the protons, neutrons, and electrons that make up an atom is a little bit less than the observable atomic mass. According to an equation, the energy produced during the combination of these particles is converted into binding energy, which equals the product of the mass (m) spent and the square of the velocity of light in vacuum (c), or E = mc². This discrepancy is known as the mass defect.

Therefore the correct option is D.

Read more about atomic mass, here

https://brainly.com/question/17067547

#SPJ2

Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.

So A

Explanation:

This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.

Answer:

C. They have the same number of protons.

Explanation:

Even though in isotopes, there's uneven number of neutrons, there's always same number of protons.

Hope it helps.

Answer:

Yes

Explanation:

What's the question?

Answer:

yes, they both use it to fllight.

Explanation:

As they are adapted to flight to various places to catch their prey and be safe from various type of harms.

hope it helps..

Answer:

14.40g of H2

Explanation:

The balanced equation for the reaction is given below:

B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)

Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:

Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol

Mass of B2H6 from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 6 x 2 = 12g

From the balanced equation above,

28g of B2H6 reacted to produce 12g of H2.

Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:

From the balanced equation above,

28g of B2H6 reacted to produce 12g of H2.

Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.

Therefore, 14.40g of H2 were produced from the reaction.

The answer is

O ionic

Answer: Polar covalent

Explanation: Gradpoint

Answer:

FROM the magnetic point of view, phosphorus is an extremely interesting

substance because of its allotropic modifications. The ordinary forms are

the yellow (or white) and the red varieties. X-ray investigations indicate

that probably yellow phosphorus is analogous with the cubic forms of antimony and arsenic; and red phosphorus with monoclinic antimony and

arsenic (Mellor, 1928). The conclusions of different workers on the structure of red phosphorus are not in agreement. There is also Bridgman's black

phosphorus which is probably hexagonal (Linck and lung, 1925). Natta

and Passerini (1930) have studied the crystal structure of white phosphorus.

This substance when condensed at the temperature of liquid ammonia is

cubic. Atomic positions however are yet undetermined. Another and noncubic form is obtained by condensation at liquid-air temperatures. It is

thus clear that most likely white phosphorus is cubic in structure with a

probable superposition of another lattice.

The evidence from Raman effect also points to the same conclusion.

Bhagavantam (1930) investigated the Raman effect of white phosphorus in

the solid state. The characteristic frequencies obtained by him are 607, 468

and 374. Since the phosphorus molecule is known to contain 4 atoms,

Bhagavantam (1930) has shown that the tetrahedral structure fits the results

satisfactorily since such a structure would give only three frequencies. But

for the particular law of forces adopted, the frequencies should have the

ratio 2: 2: 1 but the observed frequencies deviate considerably.

Phosphorus is a really intriguing element. because of the allotropic changes to the material.

Red phosphorus is likely akin to monoclinic antimony, while yellow phosphorus is probably similar to the cubic forms of antimony and arsenic.

There is disagreement among the findings of many researchers regarding the structure of red phosphorus. Additionally, Bridgman's black It is presumably hexagonal, phosphorous (Linck and lung, 1925). Natta and Passerini (1930) have investigated the white phosphorus crystal structure.

Condensed from this material at liquid ammonia temperature is cubic. However, the locations of the atoms are still unknown. Condensation at liquid air temperatures yields a different, noncubic shape.

Therefore, Phosphorus is a really intriguing element. because of the allotropic changes to the material.

To learn more about phosphorus, refer to the link:

https://brainly.com/question/4622631

#SPJ3

Answer:

8

Explanation:

Since Xe (xenon) is a noble gas, it has 8 valence electrons. It's outer shell is full and it is a stable element and doesn't like to react. Therefore, since the electron dot diagram is about valence electrons, 8 would be your answer.

Answer:

i got ddoxed by skai jackson

Explanation:

it sucked

Answer:

3.5 g CO2

Explanation:

A hummingbird emits up to 3.5 grams of CO2 a day.

Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)

=3.5 grams

Hope this helps!

Answer:

The elements with the lowest ionization energy of all element are alakli metals

Explanation:

According to research,

The element with the lowest ionization energy is cesium (Cs). Cesium has atomic number 55 and is in the fifth row of the periodic table.

Caesium is a soft, silvery-golden alkali metal .

Answer:B

Explanation:

TOOK DA TEST

As the firework releases heat, it is considered as exothermic reaction. The correct option is B.

An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.

Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.

Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.

Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.

Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.

As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.

Thus, the correct option is B.

For more details regarding exothermic reaction, visit:

https://brainly.com/question/10373907

#SPJ6

Answer:

To find the number of molecules first find the number of moles.

number of moles (n) = mass / molar mass (M)

then use the formula

N = n × L

where n = number of moles

N = number of entities

L = Avogadro's constant = 6.02 × 10^23entities to find the number of molecules

A. 4.9 g H2O

m = 4.9g

M = (2*1)+(16×1) = 2 + 16 = 18g/mol

n = 4.9/18 = 0.272mol

N = 0.272 × 6.02 × 10^23

= 1.6374*10^23 molecules of H2O

B. 54.4g of N2

m = 54.4g

M(N2) = 14×2 = 28g/mol

n = 54.4/28 = 1.942mol

N = 1.942 * 6.02*10^23

= 1.1690*10^24 molecules of N2

C. 89 g CCI4

m = 89g

M(CCl4) = 12 + (35.5 × 4) = 154g/mol

n = 89/154 = 0.577mol

N = 0.577 × 6.02 × 10^23

= 3.473*10^23 molecules of CCl4

D. 11 g C6H12O6

m = 11g

M(C6H12O6) = (12×6)+(12×1)+(16×6) =

180g/mol

n = 11/180 = 0.0611mol

N = 0.0611 × 6.02×10^23

= 3.678*10^22 molecules of C6H12O6

Hope this helps

Answer:

answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain

Explanation:

edge in 2020 :)

The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.

Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.

Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.

Hence it is a saturated hydrocarbon that has more than 35 carbons.

To know more about asphalt, visit the below link:
https://brainly.com/question/431314

Answer:

atoms are bonded with a single bond one double bond