why is this mars landing a new era for space exploration

Answer:

1. thermometer

2. thermal energy

3. specific heat

4. temperature

5. Celsius

6. heat

7. mass

1) The substances present before the reaction has occurred.

2) The substances formed after the reaction has occurred.

3) A negatively charged ion, typically non-metal, that gains electrons to become stable.

4) A positively charged ion, typically metal, that losses electrons to become stable.

5) A chemical reaction in which the reactants absorb heat energy from the surroundings to form products.

6) A chemical reaction in which the reactants release heat energy into the surroundings to form products.

Answer:

d

Explanation:

The student should dissolve approximately 4.1 g of NaC₂H₃O₂ to prepare a buffer solution with pH 4.74.

To prepare a buffer solution with pH 4.74, the graduate student needs to add an appropriate amount of sodium acetate (NaC₂H₃O₂) to the given acetic acid solution.

First, we can use the Henderson-Hasselbalch equation:

pH = pKa + log ([A-]/[HA])

where pH is 4.74, pKa is the acetic acid pKa (1.76), [A-] is the concentration of the acetate ion, and [HA] is the concentration of acetic acid. We need to find [A-] and [HA] in moles per liter.

4.74 = 1.76 + log ([A-]/[HA])

Rearranging the equation and solving for the ratio [A-]/[HA]:

[A-]/[HA] = 10^(4.74 - 1.76) ≈ 1

Since the ratio of acetate ion to acetic acid is approximately 1, this means that the concentrations of NaC₂H₃O₂ and acetic acid should be equal.

Now, let's calculate the moles of acetic acid present in the solution. Acetic acid's molecular weight is 60.05 g/mol. If the student has 500 mL of a 0.10 M solution:

moles of acetic acid = 0.10 mol/L * 0.5 L = 0.05 mol

Since we need an equal amount of sodium acetate, the moles of NaC₂H₃O₂ required will also be 0.05 mol. The molecular weight of NaC₂H₃O₂ is 82.03 g/mol. To find the mass of NaC₂H₃O₂ needed, we can use the formula:

mass = moles * molecular weight

mass of NaC₂H₃O₂ = 0.05 mol * 82.03 g/mol ≈ 4.1 g
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Answer:

electric charges.

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.

An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

\( V = IR\)

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

The correct option is B. protect against deterioration. The process of galvanizing involves coating iron or steel with a layer of zinc to protect it from rust and other forms of corrosion.

This helps to extend the lifespan of the metal and keep it looking good over time. Galvanizing is a common technique used in a variety of industries, from construction to automotive manufacturing, to ensure the durability and longevity of metal components. Galvanizing is a process of coating the surface of iron or steel with a layer of zinc and this layer acts as an effective barrier that prevents oxygen and water from coming in contact with the underlying metal, reducing the rate of corrosion.

   It also provides a more attractive finish and prevents galvanic action, where two different types of metals react with each other and cause corrosion. Galvanizing is an effective way to extend the life of iron and steel products and can help reduce the cost of maintenance.

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ANSWER

shell or the energy level

Answer:

1. In 0.0250 moles of potassium chromate there are 0.05 moles of potassium , 0.025 moles of chromium and 0.1 moles of oxygen are present.

2. In 4.50 moles of ammonium carbonate there are 9 moles of ammonium ions and 4.5 moles of carbonate ions are present.

Explanation:

1.

Moles of potassium chromate = 0.0250 mol

Formula of potassium chromate = \(K_2CrO_4\)

1 mole of potassium chromate has 2 moles of potassium , 1 mole of chromium and 4 moles of oxygen.

Then in 0.0250 moles of potassium chromate:

Moles of potassium will be:

\(2\times 0.0250 mol= 0.05 mol\)

Moles of chromium will be:

\(1\times 0.0250 mol= 0.025 mol\)

Moles of oxygen will be:

\(4\times 0.0250 mol= 0.1 mol\)

2.

Moles of ammonium carbonate = 4.50 mol

Formula of ammonium carbonate =\((NH_4)_2CO_3\)

1 mole of ammonium carbonate has 2 moles of ammonium ion and 1  mole of carbonate ion.

Then in 4.50 moles of ammonium carbonate:

Moles of ammonium ion will be:

\(2\times 4.50 mol= 9mol\)

Moles of carbonate ions will be:

\(1\times 4.50 mol= 4.5 mol\)

Answer:-Fill an oversized 1L graduated cylinder with a set amount 500ml of water and record below. To find the total Volume displaced, subtract Initial Volume and Volume of Object. To calculate Density divide the Mass in grams by the Volume displaced in milliliters. Finally record whether the object floats or sinks.

Measure the volume of water poured into a graduated cylinder, then place the object in the water and remeasure the volume. The difference between the two volume measurements is the volume of the object. Now simply divide the mass by the volume to calculate the density of the object.

Using a mass balance, mass the container. Pour the liquid into the container and mass them together. Subtract the mass of the container from the mass of the container with the liquid. The difference will be the mass of the liquid alone.

The equation for Beer's law is a straight line with the general form of y = mx +b. where the slope, m, is equal to εl. In this case, use the absorbance found for your unknown, along with the slope of your best fit line, to determine c, the concentration of the unknown solution.

Traveling upwards of 200 mph or 320 km/h, and accelerating in a matter of seconds, germs from a cough or sneeze can travel a great distance very quickly.

Answer:

C38H

Thank You!  :)

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Answer: Summer Solstice

In North America, around June 21, Earth tilts on its axis toward the Sun. This is called the summer solstice, and it is when the Northern Hemisphere has the most daylight of any time of the year. It is also when the Sun appears to be the highest in the sky, and it has its greatest angle to Earth.

The biggest difference between the equinox and the solstice is that a solstice is the point during the Earth's orbit around the sun at which the sun is at its greatest distance from the equator, while during an equinox, it's at the closest distance from the equator.

Explanation:

Pigments that are absorbed strongly tend to move more slowly than those that are absorbed weakly. This is because strong absorption means that the pigment is more tightly bound to the surface it is on, which results in less movement.

Additionally, the size and shape of the pigment molecule also affect its movement. Larger and more complex molecules tend to move more slowly than smaller and simpler ones. This is because larger molecules experience more friction as they move through a medium, which slows them down.
It's important to note that the movement of pigments is also influenced by external factors such as temperature, pressure, and the nature of the medium they are in. In general, a higher temperature and lower pressure will increase the movement of pigments, while a more viscous medium will slow them down.
In summary, pigments that are absorbed strongly tend to move more slowly, but their movement can also be affected by factors such as size, shape, temperature, pressure, and the nature of the medium they are in.

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The name of the method is multi-way split.

Out of the foregoing discussion, four potential alternative criteria for creating and choosing multiway splits emerge:

We look at each in turn; the following part includes an experimental comparison.

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Answer:

47.596008

Explanation:

Answer:

covalent bonds form between two nonmetals, resulting in a sharing of electrons-in order to reach their eight valence electrons (octet rule ) however the atoms rarely share the electrons equally. In polar covalent bonds, the electrons are shared unequally.

ex. HCl

and H2O

Answer:

Chemical formula of Oxygen is O2.

We know ,

1 mole of a substance contains 6.022×10^23, Avogadro’s Constat.

Here, Molar mass of O = 16u

And molar mass of O2 = 32u

And 32g of O2 = 1 mole of O2

It means that,

32g of O2 = 6.022×10^23 molecules

Answer:

The correct answer is given in the picture

This ANSWER IS ONLY CORRECT WHEN Oz STAND FOR OZONE

Answer:

Difference : group 1 elements are known as alkali metals, group 7 elements are known as transition metals

Similarities : Both group 1 and 7 elements become more reactive as u go down and up respectively

Answer:

Explanation:

To find the number of atoms present in 8.500 mole of chlorine atoms, we can use Avogadro's number, which states that one mole of any substance contains 6.022 x 10^23 particles. Therefore, 8.500 moles of chlorine atoms would contain:

8.500 moles x 6.022 x 10^23 atoms/mole = 5.1207 x 10^24 atoms of chlorine

To determine the mass (g) of 15.50 mole of oxygen, we can use the molar mass of oxygen, which is 16.00 g/mol. Therefore, the mass of 15.50 moles of oxygen would be:

15.50 moles x 16.00 g/mol = 248 g of oxygen

To determine the number of moles of helium in 1.953 x 10^8 g of helium, we can use the molar mass of helium, which is 4.00 g/mol. Therefore, the number of moles of helium would be:

1.953 x 10^8 g / 4.00 g/mol = 4.883 x 10^7 moles of helium

To calculate the number of atoms in 147.82 g of sulfur, we first need to find the number of moles of sulfur using the molar mass of sulfur, which is 32.06 g/mol. Therefore, the number of moles of sulfur would be:

147.82 g / 32.06 g/mol = 4.604 moles of sulfur

Next, we can use Avogadro's number to find the number of atoms in 4.604 moles of sulfur:

4.604 moles x 6.022 x 10^23 atoms/mole = 2.772 x 10^24 atoms of sulfur

The molar mass of Co (cobalt) can be found on the periodic table, which is 58.93 g/mol.

To determine the formula mass of Ca3(PO4)2, we need to find the sum of the masses of all the atoms in the formula. The molar masses of Ca, P, and O can be found on the periodic table:

Ca: 40.08 g/mol

P: 30.97 g/mol

O: 16.00 g/mol

Ca3(PO4)2 would contain:

3 atoms of Ca: 3 x 40.08 g/mol = 120.24 g/mol

2 atoms of P: 2 x 30.97 g/mol = 61.94 g/mol

8 atoms of O: 8 x 16.00 g/mol = 128.00 g/mol

Adding these masses together gives us:

120.24 g/mol + 61.94 g/mol + 128.00 g/mol = 310.18 g/mol

Therefore, the formula mass of Ca3(PO4)2 is 310.18 g/mol.

Answer:

box A

Explanation:

10 is bigger than 3 since 10 is bigger it has more force in it

Answer:

n = 0.13 moles of C2H6

grams = 11 g of CO2

Explanation:

Answer:

Iron and Oxygen

Explanation:

Fe is Iron and O2 is Oxygen

The number of electron bond pairs between two atoms determines the bond order. A single bond has a bond degree of 1, a double bond has a bond degree of 2, and a triple bond has a bond degree of 3 and so on.

The distance between the structures of covalently bound atoms is referred to as bond order. The number of electrons surrounding the bond determines how long the bond will last (bond order). The greater the attraction between the two atoms and the shorter the bond length are, the higher the bond order. The length of a bond between two atoms is typically equal to the sum of their covalent bond radii. Picometers are used to express bond lengths. As a result, the bond lengths grow as follows:

Single bond > double bond > Triple bond

The higher the bond order, the more stable the molecule. A stable bond is less likely to break and therefore has a higher binding energy. As the bond order increases, the bond length decreases. Triple bonds are more energetic and stable because they have shorter bond lengths than double or single bonds

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In the given section, a mole can be defined as the amount of a substance that contains the same number of entities as there are atoms in 12 grams of pure carbon-12.

n grams and moles are related to the number of atoms, molecules, or other particles because one mole of any substance contains Avogadro's number of particles, which is 6.022 x 10²³ particles per mole.

For example, if you have 10 moles of a substance, then you have 6.022 x 10²⁴ particles of that substance. The relationship between moles and the number of particles is directly proportional to each other.

Therefore, if you increase the number of moles of a substance, you increase the number of particles of that substance.The number of atoms, molecules, or other particles in a sample is related to the mass of the sample.

The number of moles of a substance is proportional to the mass of the sample.

The relationship between the number of moles and the mass of a substance is given by the formula : n = m / M

where n = no. of moles ;

m = mass of the substance (in g) ;

M = molar mass of the substance in grams per mole.

Thus, the required answer is explained above.

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Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Explanation:

Explanation:

When the gymnast is standing straight up, gravity acts on the gymnast but the gymnast is able to stay relatively stable.Tihis happens because her center of mass is directly above the beam which means that gravity is pushing her down onto the beam.