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The mixture you separated was a mixture of iron filings, sand, and salt. Based on your understanding of matter, is this mixture a homogenous mixture or heterogenous mixture? How do you know? 
A.)homogenous mixture-the parts are uniformly mixed
B.)homogenous mixture-the parts are not uniformly mixed
C.)heterogenous mixture-the parts are uniformly mixed
D.)heterogenous mixture-the parts are not uniformly mixed

Material  deposited directly  by s glacier is called  till (answer C)

Explanation

Till is a heterogenous  mixture  of different  sized   material  deposited  by  moving ice.  This type of till is known as lodgement  till.

The other type of till   is deposited  by  the melting  in place of stagnant  ice  and   is referred to as ablation till.

After  deposition, some till are  reworked by  water.

The atom with the greatest number of valence electrons is I: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵. It has 7 valence electrons in the outermost energy level (5p). Thus, the correct option is option C.

Valence electrons are the electrons in the outermost energy level of an atom and are involved in chemical bonding and reactions. Electronic configuration refers to the arrangement of electrons in an atom, ion, or molecule. It describes the distribution of electrons among different energy levels, orbitals, and subshells within an atom or ion.

The electronic configuration is represented using a notation that indicates the energy levels (principle quantum numbers), subshells (s, p, d, f), and the number of electrons in each subshell. The Aufbau principle, Pauli exclusion principle, and Hund's rule are used to determine the order of filling the orbitals and the spin states of the electrons.

Thus, the ideal selection is option C.

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Answer:

strontium, magnesium, calcium, beryllium

Explanation:

these all belong to the same group!

Strontium , magnesium,calcium and beryllium have similar  properties as they belong to same group.

In the periodic table, properties vary along  a  group as well as period due to the change in number of valence electrons. In a group the number of valence electrons remains same for all the elements of a group .

A new successive shell is added and hence number of valence electrons remain same.Number of valence electrons do not change in a group and hence elements in a group have similar properties as only valence electrons take part in chemical reactions.

While in a period, with each successive element one more electron is added to the same shell due to which number of valence electrons for each shell does not remain same,rather it increases with each successive element .As a result, of this elements in a period do not have similar properties.

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The Law of Conservation of Matter applies to chemical reactions by stating that the amount and type of atoms in the reactants must equal the amount and type in the products. This is due to the fact that matter cannot be created or destroyed in an isolated system. For example, the reaction of hydrogen and oxygen to form water shows this conservation.

The Law of Conservation of Matter states that matter cannot be created or destroyed in an isolated system. In the context of chemical reactions, this means that the amount and type of atoms before the reaction (in the reactants) must be equal to the amount and type of atoms after the reaction (in the products).

For example, in the reaction of hydrogen and oxygen to form water: 2H2 + O2 -> 2H2O, there are 4 hydrogen atoms and 2 oxygen atoms both before and after the reaction. Thus, the total mass of the reactants equals the total mass of the products, illustrating the Law of Conservation of Matter.

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The color of the flame for the compound sodium hydroxide (NaOH) is yellowish orange.

Sodium hydroxide or caustic soda can be described as an inorganic compound with the chemical formula NaOH. Sodium hydroxide is a white solid ionic compound containing sodium cations Na⁺ and hydroxide anions OH⁻ ions.

Sodium hydroxide (NaOH) can be defined as a highly caustic base that decomposes proteins at normal ambient temperatures and can cause severe chemical burns.

Sodium hydroxide is a colorless crystalline solid with a boiling point of 1,388 °C. NaOH has a lower solubility in polar solvents such as ethanol and methanol but is highly soluble in water.

Dissolution of sodium hydroxide in water is a highly exothermic reaction where a huge amount of heat is liberated, posing a danger through the possibility of splashing.

The color of the flame for the compound sodium hydroxide, NaOH is yellow-orange due to sodium metal.

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The percent error of the average result is approximately 8.2%.

To calculate the percent error, use the formula:

[tex]\[ \text{Percent Error} = \left| \frac{\text{Measured Value} - \text{Actual Value}}{\text{Actual Value}} \right| \times 100\% \][/tex]

Given:

Measured Value = Average result =x mL

Actual Value = 34.1 mL

Plug in the values into the formula:

[tex]\[ \text{Percent Error} = \left| \frac{x - 34.1}{34.1} \right| \times 100\% \][/tex]

Now, substitute the average result value (measured value) into the formula. Let's say the average result is 36.9 mL:

[tex]\[ \text{Percent Error} = \left| \frac{36.9 - 34.1}{34.1} \right| \times 100\% \]\[ \text{Percent Error} = \left| \frac{2.8}{34.1} \right| \times 100\% \]\[ \text{Percent Error} = \frac{2.8}{34.1} \times 100\% \]\[ \text{Percent Error} = 0.0821 \times 100\% \]\[ \text{Percent Error} = 8.21\% \][/tex]

So, the percent error of the average result is approximately 8.2%.

A) Endothermic reactions where there is a decrease in entropy.

To determine which type of reaction does not happen spontaneously, we need to consider the Gibbs free energy equation:

Gibbs free energy (G) = Enthalpy (H) - Temperature (T) × Entropy (S)

A reaction is spontaneous if the change in Gibbs free energy (ΔG) is negative.

ΔG = ΔH - TΔS

Where:

ΔH is the change in enthalpy (positive for endothermic reactions, negative for exothermic reactions).

ΔS is the change in entropy (positive for increasing entropy, negative for decreasing entropy).

T is the temperature in Kelvin.

Analysis:

Endothermic reactions with a decrease in entropy:

ΔH > 0 (positive)

ΔS < 0 (negative)

ΔG = ΔH - TΔS

Since ΔH is positive and ΔS is negative, ΔG will be positive if TΔS is not large enough to make ΔG negative. Therefore, this reaction may not be spontaneous.

Exothermic reactions with a decrease in entropy:

ΔH < 0 (negative)

ΔS < 0 (negative)

ΔG = ΔH - TΔS

Although ΔH is negative, TΔS is positive. If ΔH is not sufficiently negative, ΔG can still be positive, making the reaction non-spontaneous.

Endothermic reactions with an increase in entropy:

ΔH > 0 (positive)

ΔS > 0 (positive)

ΔG = ΔH - TΔS

Here, if TΔS is greater than ΔH, ΔG will be negative, making the reaction spontaneous.

Exothermic reactions with an increase in entropy:

ΔH < 0 (negative)

ΔS > 0 (positive)

ΔG = ΔH - TΔS

Both terms are favorable; thus, ΔG will typically be negative, making the reaction spontaneous.

Answer:

Option C, atomic number

Explanation:

In the modern periodic table, elements are arranged in the increasing order of atomic number.

As per the modern periodic law,

When the elements are arranged in the order increasing atomic number, then periodicity in the properties are observed, Periodicity in the properties means similar properties repeated after certain intervals.

In modern periodic table, elements are arranged in 7 periods and 18 groups.

The number of moles in 17.5 grams of sodium can be calculated using the formula moles = mass / molar mass. With a molar mass of sodium of about 22.99g/mol, the result of our calculation will be approximately 0.761 moles.

The subject of this question is Chemistry, and it involves the concept of moles. To find the number of moles in a given amount of substance, one would use the formula: moles = mass / molar mass. The molar mass of sodium is approximately 22.99 g/mol.

To calculate the number of moles in 17.5 grams of sodium, you would carry out the following calculation: 17.5 g (the given mass of sodium) divided by 22.99 g/mol (the molar mass of sodium).

Here's the calculation: moles = 17.5 g / 22.99 g/mol = 0.761 moles. So, there are approximately 0.761 moles in 17.5 grams of sodium. This makes the answer to the question '0.761'.

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Answer: It spreads forming waves

Explanation:

Radiant energy is the one possessed by electromagnetic waves such as visible light,  (IR) rays, ultraviolet (UV) rays, radio waves, etc. The main characteristic of this energy is that it can be propagated in a vacuum, without the need for any material support.

Other properties are:

- It is in motion continuosly

- Travel through space at the speed of 300,000 kilometers per second

- It spreads forming waves.

Answer:

The K energy level or innermost shell of the electron.

Explanation:

The K shell is the innermost shell of an electron and to remove an electron in this shell, it requires the most energy compared to the other shells. An electron can be subdivided into K, L, M, N and so on shells depending on the number of electrons the element possesses. The amount of energy needed to remove electrons from each energy level increasing inwards and this is as a result of the shielding effects of the nucleus of the element. The nucleus shields electrons from been removed from the shells and the distance away from the nucleus by the electrons reduces their staying power. So electrons closer to the nucleus are not easily removed and requires the most energy in case it will be removed.

Answer:

3

Explanation:

If the internal energy of the products in a reaction is lower than the internal energy of the reactants, this means the reaction is an exothermic reaction and the sign of δe for the reaction is positive.

Internal energy is the property or state function which defines the energy of a substance in the absence of effects due to capillarity and the external electric, magnetic, and other fields.

In this reaction, the internal energy of products is lower than the internal energy of the reactants because the bonds in the products are stronger than those in the reactants, as a result the reaction releases more energy than it consumes. Therefore, the reaction is an example of exothermic reaction.

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