Which of the following observations would indicate that a material is a pure substance

A political map is a kind of map which contains a north arrow, key and a map scale.

This kind of map usually indicates the governmental boundaries of countries, states, or any counties,

And, they give information about the location of major cities, also they usually include significant bodies of water.

Answer:

Political maps contains north direction, key and scale of map

Explanation:

Map is the two-dimensional representation of the earth showing its various features and locations along with proper latitude and longitude. It has different types of maps, of which the physical maps are widely used. Political maps are those maps in which the countries are separated by distinct boundaries. It is widely used to determine the location of any particular place on earth. It highlights the countries with different colors with various colors excluding blue because the blue color is used to represent the water bodies on earth.

These political maps are comprised of keys, the north direction and the scale of the map.

a gap in the rock layer due to erosion or from no rocks being deposited

geological processes taking place today are the same as those that occurred in the past.  

fossil that record the shape and structure of an organism

each layer is older than the layer above and younger than the layer below it.

the preserved remains or traces of a once living organism.

fossils that record the movement or behavior of an organism.

sediments spread in all directions until they thin out or hit a barrier.

sedimentary rocks are deposited horizontally.

age of rock compared to the ages of rock layers.

age of rocks calculated in years since formed.

words:

1.absolute age

2.body fossil

3.fossil

4.principle of lateral continuity

5.principle of original horizontally

6.principle of superposition

7.relative age  

8.trace fossil

9. unconformity

10.uniformitarianism

Answer is 9,10,2,6,3,8,4,5,7,1

All my answers were correct on this one

Answer: ≈ 708 ( to 3 s.f.)

Working Out:

First we have to establish a balanced chemical equation that defines the reaction

       4 Al     +    3 O₂    →    2 Al₂O₃

Now, mole =  mass ÷ molar mass

∴ If the mass of Al in the reaction = 375 g

              then the # of moles of Al =  375 g  ÷  27 g/mol

                                                        =  13.889 mol

Also, the mole ratio between Al and Al₂O₃  is  2 : 1  (4 : 2).

As such if moles of Al = 13.889 mol

then #  of moles of Al₂O₃ =  13.889 mol ÷ 2

                                         = 6.944 mol

Since mass = mole × molar mass

Then mass of Al₂O₃ = 6.944 mol × ((27 × 2) + (16 × 3)) g/mol

                                 = 6.944 mol × 102  g/mol

                                 = 708.288 g

Final answer:

375 grams of Al will produce approximately 708 grams of Al₂O₃ when it reacts completely with oxygen, according to the balanced chemical equation 4Al + 3O₂ → 2Al₂O₃.

Explanation:

To find out how many grams of Al₂O₃ will be produced from 375 grams of Al reacting completely, we need to first write the balanced chemical equation involving aluminum and oxygen. The following is the balanced equation for the reaction between oxygen (O₂) and aluminum (Al):

4Al + 3O₂ → 2Al₂O₃.

Next, we need to calculate the molar mass of aluminum, which is approximately 26.98 g/mol. Using this, we can find the number of moles of Al by dividing the given mass by the molar mass:

Moles of Al = 375 g / 26.98 g/mol ≈ 13.90 mol of Al.

According to the balanced equation, 4 moles of Al produce 2 moles of Al₂O₃. Using this stoichiometric ratio, we can find how many moles of Al₂O₃ will be produced:

Moles of Al₂O₃ = (13.90 mol Al) × (2 mol Al₂O₃ / 4 mol Al) ≈ 6.95 mol of Al₂O₃.

Finally, we calculate the mass of Al₂O₃ by multiplying the moles by the molar mass of Al₂O₃ (which is approximately 101.96 g/mol):

Mass of Al₂O₃ = 6.95 mol × 101.96 g/mol ≈ 708 g.

Therefore, 708 grams of Al₂O₃ will be produced when 375 grams of Al react completely, rounded to three significant figures.

Answer : The length of pencil in inches are 7.48 inches.

Explanation :

The conversion used form centimeter to inch is :

[tex]1in=2.54cm[/tex]

As we are given that the length of the pencil is 19 cm. Now we have to determine the length of the pencil in inches.

As, 2.54 centimeter length of pencil = 1 inch

So, 19 centimeter length of pencil = [tex]\frac{19cm}{2.54cm}\times 1inch=7.48inches[/tex]

Therefore, the length of pencil in inches are 7.48 inches.

Penny has a pencil that is 19 cm long. Penny's pencil is 7.48 inches long.

To convert centimeters to inches, use the conversion factor that is  1 inch is equal to 2.54 centimeters.

To find out how long the pencil is in inches, divide the length of the pencil in centimeters by the conversion factor as follows:

Length in inches is equal to the ratio of Length in centimeters to the Conversion factor.

The calculation for length in inches:

Length in inches = 19 cm / 2.54 cm/inch

Length in inches = 7.48 inches

Therefore, Penny's pencil is 7.48 inches long.

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Each compound particle contains 1 atom of element A. However, not all atoms of element B are used, signifying that some are left over after the compounds are formed.

In this case, the question is looking at how atoms of element A and element B are combining to form 6 compounds. If we break down the numbers, 6 atoms of A combine with 8 atoms of B to create 6 compound particles. This means that for each compound, there must be 1 atom of element A (6 atoms of A / 6 compounds = 1 atom of A per compound) and roughly 1.33 atoms of element B (8 atoms B / 6 compounds = 1.33), but as we cannot have a fraction of an atom, this suggests that not all atoms of element B are used in the creation of these compounds, perhaps leaving some atoms of element B left over.

For a chemically correct scenario, all participating atoms are usually used up in the formation of compounds unless specified otherwise, illustrating the principle of matter conservation in chemical reactions.

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Each particle contains 1 atom of element A and 1 atom of element B. All 6 atoms of element A and 8 atoms of element B are used to form the compounds.

In this compound, 6 atoms of element A combine with 8 atoms of element B to form 6 compound particles. To determine the number of atoms in each particle, we divide the total number of atoms by the total number of particles. In this case, each particle contains 1 atom of element A and 1 atom of element B.

Not all atoms are used to form compounds. In this scenario, all 6 atoms of element A and all 8 atoms of element B are used to form the 6 compound particles.

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Whhhhaaaatttt????? A gold ball has more mass because it is a solid and we all  know that gold is sssuuuuuuuuppppppeeerr heavy...

So a tennis ball does not have more mass because it is not heavy... I don't know how to say it but it is a solid... but not heavier.

Hope this helps....

Boil the water to get remove the salt and then use filter paper to remove the microorganisms

Answer:

The answer is reverse osmosis!

Explanation:

I chose this on a test and got it right

Final answer:

The 93Nb+3 ion has 41 protons, 52 neutrons (assuming the most common isotope of Nb-93), and 38 electrons.

Explanation:

To determine the number of protons, neutrons, and electrons in the 93Nb+3 ion, we use the periodic table to find niobium's (Nb) atomic number and mass number. The atomic number, which is the same as the number of protons, is 41 for niobium. The ion has a 3+ charge (Nb+3), meaning it has lost 3 electrons compared to the neutral atom. Since the neutral atom has the same number of protons and electrons, the Nb+3 ion has 41 protons and 41 - 3 = 38 electrons.

To find the number of neutrons, we need additional information such as the isotope's mass number. However, this was not provided in the question. Typically, we could use the most common isotope for niobium, which is Nb-93 (mass number 93), where the number of neutrons is the mass number minus the atomic number: 93 - 41 = 52 neutrons.

Assuming the most common isotope and no additional isotopic information, the 93Nb+3 ion contains 41 protons, 52 neutrons, and 38 electrons.

Pretty sure it's the transfer of electrons.

Answer: Option (B) is the correct answer.

Explanation:

A chemical reaction in which there is transfer of electrons between any two species is known as a redox reaction.

For example, [tex]Cu(s) + 2Ag^{+}(aq) \rightarrow Cu^{2+} + 2Ag(s)[/tex]

Oxidation-half reaction: [tex]Cu(s) \rightarrow Cu^{2+} + 2e^{-}[/tex]

Reduction-half reaction: [tex]2Ag^{+}(aq) + 2e^{-} \rightarrow 2Ag(s)[/tex]

Thus, we can conclude that balancing a redox equation by the half-reaction method is based on action of transfer of electrons.

The total number of digits that are counted while performing a measurement, are called significant figures or significant numbers. In a measured number, all the digits are certain except the last digit. The last digit which is uncertain in a measured number is called estimated digit. In the measurement 543.1267 inches, the last digit 7 is estimated digit. While taking into account the total number of significant figures, we count all the certain digits plus the estimated digit. Therefore, the number 543.1267 has 7 significant figures.

Final answer:

In the measurement 543.1267 inches, the estimated digit is 7 since it's the least significant digit in the sequence and is beyond the smallest marked unit of the measuring tool, thus it must be estimated.

Explanation:

In the measurement 543.1267 inches, the estimated digit is the 7. This is because in any measurement, the last digit that you report is always an estimated digit. The least significant digit is this estimated digit. To understand this concept, consider a ruler which may not have exact markings below a certain decimal place. In such cases, the smallest digit marked on the instrument is known for certain, while the next smallest digit—or the digit beyond the smallest marked unit—is considered to be an estimate.

For example, using a ruler with millimeter markings, if the length measured is between two marks, the measurer can be certain of the millimeters but would estimate the tenths of a millimeter. This principle helps to understand the accuracy of the measurement, which is critical for various scientific and technical applications. Thus, in the given measurement of 543.1267 inches, the digit 7 represents a level of precision that must have been estimated based on the granularity of the measuring tool.

From the ideal gas equation,

[tex]PV = nRT[/tex]

where n is number of moles, R is Universal gas constant, P is pressure, V is volume,  and T is temperature of the gas.

The pressure and volume are inversely proportional to each other at constant temperature and number of moles.

Hence, on decreasing the pressure, the volume will increase.

As the hiker reaches a height of a mountain, the pressure would decrease which results in the reestablishment of equilibrium between gas molecules thus resulting in pushing of bag outwards.

Hence, the bag will expand as the hiker reaches the top of the mountain.

The problem is about calculating mass using the provided density and volume of an object or substance. In physics, mass is determined by multiplying density by volume, resulting in a mass of 70g in this instance.

The subject of this question is tied to the concept of density, a physical property of matter. In physics, we calculate density by dividing mass by volume.

Here, the density is given as 7g/ml, and the volume is stated as 10ml. Using the provided values, you could rearrange the density formula to find the mass.

Mass is calculated by multiplying density by volume, resulting in a mass of 70g.

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The pressure in a sealed container means the volume of container is fixed

so we cannot change the volume of container hence gas

The other factors which can affect the pressure are

a) moles of gas : if we increase the moles of gas the pressure of gas will increase

b) Temperature: if we increase the pressure of gas the pressure of gas will increase due to increase in kinetic energy

So the following cannot increase pressure

a) decrease in moles of gas

b) decrease in temperature of gas

Hey there! Your answer is C. Increasing the volume of the container

This is because the container is already sealed, so the volume is fixed.

Answer is:  a bottle of acetic acid contains a solid.

Acetic or ethanoic acid (CH₃COOH) when undiluted is called glacial acetic acid.

Glacial acetic acid has freezing point (melting point) around 16.6°C, so it will be at solit state.

Vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar  is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.

Acetic acid dissociate in aqueous solution to form hydrogen ions (H⁺) and acetic anion (CH₃COO⁻).

Balanced chemical reaction (dissociation):  

CH₃COOH(aq) ⇄ CH₃COO⁻(aq) + H⁺(aq).

Answer:

The spoon inside the soup bowl heats up due to heat conduction.

Conduction is one of the types of thermal transfer that allows heat to be transmitted from a hot object to a cold one. (from soup bowl to spoon)

In conduction there is no matter transport. What is transferred is heat, which is a form of energy, corresponding to the increase in the kinetic energy of the atom.

Thermal conduction involves the propagation of heat by contact.

Explanation:

Flammability is defined as the ability of a substance to easily catch fire.

A substance that is poisonous in nature which might even lead to death is known as a toxic substance.

When one mole of a substance oxidizes completely then the heat released is known as heat of combustion.

Compressibility is defined as the ability of a substance to reduce in size.

Hence, we can conclude the terms are matched with the example that shows its definition are as follows.

The nucleus of the atom is the region which is surrounded by orbits of electrons around it. The central area of the atom is called as its nucleus which usually contains protons and neutrons in it. These are called subatomic particles of the atom, which includes proton, electron and neutron.

Protons are positively charged species, neutrons are neutrally charged they do not have any charge on it whereas electrons are negatively charged species. The number of protons and electrons is same in a particular specific elemental atom.

Answer: The lower temperature reduces molecule speeds, reducing the number of effective collisions.

Almost all food spoils. Most of the spoilage is because of the enzyme activity of microorganisms. Bacteria, which is an example of microorganism, grows rapidly at room temperature or higher temperatures mainly ranging between 40 degrees F to 140 degrees F.

The most commonly used strategy to minimize the rate of food spoilage is to keep it in a cool environment i.e. by refrigerating it. The lower temperature provided to the food slows down the movement of molecules and the number of collisions between them, thus slowing down the rate of enzyme activity.

Answer:

The lower temperature reduces molecule speeds, reducing the number of effective collisions.

Explanation:

The final temperature of the system is 32.4 °C.

heat lost by Pb + heat gained by water = 0

[tex]q_{1} +q_{2} = 0[/tex]

[tex]m_{1}C_{1}\Delta T_{1} + m_{2}C_{2}\Delta T_{2} = 0[/tex]

[tex]q_{1}= m_{1}C_{1}\Delta T_{1} = 21.2 \:\text{g}\times 0.128\: \text{J}^{\circ}\text{C}^{-1}\text{g}\times (T_{f} -113\: ^{\circ}\text{C}) = 2.713T_{f}\: \text{J}^{\circ}\text{C}^{-1}\: -\: 306.6\:\text{J}\cdot\text{g}^{-1}\\[/tex]

[tex]q_{2}= m_{2}C_{2}\Delta T_{2} = 14.8 \:\text{g}\times 4.184\: \text{J}\cdot^{\circ}\text{C}^{-1}\text{g}^{-1}\times (T_{f} -28.9\: ^{\circ}\text{C}) = 61.9\: \Delta T_{f} \: \text{J}^{\circ}\text{C} \:- 1790 \: \text{J}\\[/tex]

Adding [tex]q_{1}[/tex] and [tex]q_{2}[/tex] and combinibg like terms, we get

[tex]168.0\text{T}_{f}\: ^{\circ}\text{C} ^{-1}\:- 2096 = 0]\\[/tex]

[tex]T_{f} = \frac{2096}{68.0 \: ^{\circ}\text{C}^{-1}} = 32.4 ^{\circ}\text{C}\\[/tex]

water is a covalent compound which is formed by the covalent bonding between hydrogen and oxygen atoms.

The mass of the new solution is 35.7 g.  

Step 1. Calculate the moles of CaCl₂ in the first solution.  

[[tex]\text{Moles of CaCl}_{2} = \text{0.015 00 L solution} \times \frac{\text{3.22 mol CaCl}_{2}}{\text{1 L solution }} = \text{0.048 30 mol CaCl}_{2}\\[/tex]  

Step 2. Calculate the mass of CaCl₂.  

[tex]\text{Mass of CaCl}_{2} = \text{0.048 30 mol CaCl}_{2} \times \frac{\text{110.98 g CaCl}_{2} }{\text{1 mol CaCl}_{2} } = \text{5.360 g CaCl}_{2} \\[/tex]  

Step 3. Calculate the mass of the new solution.

[tex]\text{Mass of solution }= \text{5.360 g CaCl}_{2} \times \frac{\text{100 g solution }}{\text{15.00 g CaCl}_{2} } = \textbf{35.7 g solution} \\[/tex]  

yes i think so i think

No, mass is not conserved in a chemical reaction.

Answer:

A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.

Explanation:

As can be seen from the options only first option shows an observation. Here the scientists observed the wobbling of the stars and through that they deduced that there will be planets orbiting around that star. This deductions stands true as the gravity of the planet affects the motion of the star as well. Other options do not show such instances.

Alicia took half of her salary which is $42.15. So the total amount of her salary is $84..30.

Therefore, x-$42.15 ≥ $20.00

$84.30/x ≥$62.15

The amount of Alicia check is [tex]X[/tex].

Amount spent on dinner = [tex]\$42.15[/tex]  (given)

Amount brought to home = more than [tex]\$20.00[/tex]  (given)

The above information can be written in equation as:

[tex]X - \$42.5 > \$20.00[/tex]

Solving for [tex]X[/tex] as:

[tex]X > \$20.00 + \$42.15[/tex]

[tex]X > \$62.15[/tex]

Hence, inequality to represent the situation is [tex]X > \$62.15[/tex].

Luster, the way light interacts with the surface of a material, is a physical property. It describes a characteristic of the material itself, unrelated to chemical reactions. An example is the high luster of diamond due to exceptional light reflection.

Luster refers to the way light interacts with the surface of a substance or material, such as a mineral. It is considered a physical property, not a chemical property, because it describes something about the material itself, and not how it reacts with other substances or changes its composition. For example, a diamond has a high luster due its excellent ability to reflect light, which is a quality inherent to the physical structure of the diamond and not related to any chemical reactions.

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