Explanation:
Sedimentation and decantation are separation techniques that rely on the differences in densities of the solid and liquid components. In the case of a solid dissolving in a liquid, the solid particles become uniformly dispersed throughout the liquid, forming a homogeneous mixture.
Since the solid particles are not settling down due to gravity and instead are evenly distributed throughout the liquid, sedimentation cannot be used to separate the solid from the liquid. Similarly, decantation, which involves pouring off the liquid while leaving the settled solid behind, is not applicable because there is no settled solid.
To separate a dissolved solid from a liquid, other separation techniques such as filtration or evaporation may be used. Filtration involves passing the mixture through a filter medium that retains the solid particles while allowing the liquid to pass through. Evaporation involves heating the mixture to vaporize the liquid component, leaving the solid behind.
Which statement is completely accurate?
Responses
Atoms of the same element always have different atomic weights.
Atoms of the same element always have different atomic weights.
Atoms of the same element can have neutrons but exist without protons.
Atoms of the same element can have neutrons but exist without protons.
Atoms of the same element always have different numbers of neutrons.
Atoms of the same element always have different numbers of neutrons.
Atoms of the same element can have different numbers of neutrons.
Answer:
Atoms of the same element can have different numbers of neutrons.
Explanation:
This statement is true because atoms of the same element have the same number of protons, which determines the element's atomic number. However, they can have different numbers of neutrons, which gives rise to different isotopes of that element. These isotopes have the same number of protons, but different numbers of neutrons, leading to different atomic weights. So, while the number of protons is fixed for a particular element, the number of neutrons can vary.
Which is made by weathering?
Question 5 options:
sediments
ash
magma
minerals
Answer: sediments
Explanation: Weathering of volcanic ash and pumice is unique regarding minerals formed and mineral formation. These minerals include allophane, imogolite, opaline silica, and some halloysites, and have distinctive structures and properties. Mar 10, 1987
Erosion and weathering transform boulders and even mountains into sediments, such as sand or mud. A dissolution is a form of weathering—chemical weathering. With this process, water that is slightly acidic slowly wears away the stone. These three processes create the raw materials for new, sedimentary rocks.
Which of the following isotopes contains the same number of protons as 23Na+? And why
23Na
22Na
24Mg
24Al-
Answer:
23Na
Explanation:
23Na+ has 11 protons since the atomic number of sodium (Na) is 11.
Therefore, the isotope that contains the same number of protons as 23Na+ is 23Na itself.
22Na has 10 protons, 24Mg has 12 protons, and 24Al- has 13 protons. Therefore, they dont contain the same number of protons as 23Na+.
How many formula units make up 13.8 g of magnesium chloride ( MgCl2 )?
13.8 g of magnesium chloride is equal to 8.73 x 10 22 formula units ( MgCl2 ). chlorhydrate of magnesium. a two-chloride ion and one magnesium-based inorganic molecule.
Why is magnesium chloride useful?This drug is a mineral supplement used to prevent and cure low levels of magnesium in the blood. Certain brands are also used to treat symptoms of too much stomach acid, including indigestion, heartburn, and stomach discomfort.
What does the mineral magnesium chloride do in food?Chloride of magnesium
It serves as a crucial coagulant in the production of tofu, soy, drinks, and infant formula milk. Magnesium chloride is also employed in the brewing of beer as a taste ingredient and in food coloring.
MgCl2 mass = 13.8 g
Molar mass of MgCl2 = 95.2 g/mol
Number of moles of MgCl2 = ( mass of MgCl2 / Molar mass of MgCl2)
= ( 13.8g ) / ( 95.2g/mol) = 0.14496 mol
Number of MgCl2 moleucles ( or number of formula units) = Moles of MgCl2 x avagadro number
= 0.14496 mol x 6.022 x 10^ 23
= 8.73 x 10^ 22
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2. When administering an oral liquid to a patient what PPE is required?
Single chemo-therapy gloves
Double chemo-therapy gloves
Protective gown
Respiratory protection
Double chemo-therapy gloves and Protective gown
Answer:
Among the options you provided, the correct answer would be Double chemo-therapy gloves and Protective gown, as administering oral liquid to a patient carries a risk of splashing or splattering, and healthcare workers may want to avoid any contact with the patient's body fluids or the medication. However, it is important to note that this may depend on the specific policies and regulations in the healthcare setting, and healthcare workers should always follow the appropriate protocols and guidelines. Respiratory protection is not typically necessary for administering oral liquid. Single chemo-therapy gloves may be used for standard precautions, but the use of double gloves may provide additional protection.
Explanation:
What is the de Broglie wavelength (in m) of a 0.053 g object moving at a speed of 0.16 m/s?
Answer:
The equation gives the de Broglie wavelength of an object:
λ = h / p
Where λ is the de Broglie wavelength, h is Planck's constant (6.626 x 10^-34 J s), and p is the object's momentum.
The momentum of an object can be calculated using the equation:
p = m * v
Where m is the mass of the object and v is its velocity.
In this case, the mass of the object is 0.053 g, which is equivalent to 0.053 x 10^-3 kg. The velocity of the object is 0.16 m/s. So, the momentum of the object is:
p = (0.053 x 10^-3 kg) * (0.16 m/s) = 8.48 x 10^-6 kg m/s
Substituting this value of momentum and Planck's constant into the de Broglie wavelength equation, we get:
λ = (6.626 x 10^-34 J s) / (8.48 x 10^-6 kg m/s)
Simplifying, we get:
λ = 7.82 x 10^-28 m
Therefore, the de Broglie wavelength of a 0.053 g object moving at a speed of 0.16 m/s is 7.82 x 10^-28 m.
Explanation:
what is the mass of mercury produced from the decomposition of 1.25g of orange mercury(II) oxide?
The mass of mercury produced when 1.25g of mercury(II) oxide (HgO) is decomposed will be 1.247 g.
What is decomposition?Decomposition means to break up into component parts by chemical activity. Chemical decomposition, also known as chemical breakdown, is the activity of breaking down a single chemical entity (such as a regular molecule, reaction intermediate, etc.) into two or more pieces.
The precise opposite of chemical synthesis is often understood and characterized as chemical breakdown.
The reaction for the given question is:
2 HgO(s) → 2 Hg(l) + O₂(g)
Molar mass of Hg = 200.59 g/mol
Given, mass of HgO = 1.25g
Thus, moles of Hg = 1.25 g / 200.59 g/mol = 0.006225 mol
Therefore, mass of mercury produced from HgO by decomposition = 0.006225 mol × 200.59 g/mol = 1.247 g.
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How many grams of Na form when 100.0 grams NaN3 react ?
Answer:
35.4g
Explanation:
Na = 23 g/mol
NaN3 = 23 + 3(14) = 65 g/mol
2NaN3 -> 3N2 + 2Na
=> 2 moles of NaN3 will produce 2 moles of Na
or 1 mole of NaN3 will produce 1 mole of Na
the moles of NaN3 with mass of 100.0 g is 100/65 moles
so mass of Na is: (100/65) x 23 = 35.38 or 35.4g
When 33 g of a metal at 89 ◦C is added to
43 g of water at 21 ◦C, the temperature of the
water rises to 30 ◦C. What is the specific heat
capacity of the metal? Assume no heat was
lost to the surroundings.
Answer in units of J
g ·
◦C
To get a positive specific heat capacity, we would need to reverse the sign of ΔT1. However, the magnitude of c would still be the same. Therefore, the specific heat capacity of the metal is 0.137 J/(g·◦C).
What is specific heat capacity?Specific heat capacity is the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius (or one Kelvin). It is a property that describes how much heat energy a material can absorb or release when its temperature changes.
The specific heat capacity of a substance depends on its chemical composition and physical state.
Assuming that no heat is lost to the surroundings, we can write:
heat gained by metal = heat lost by water
The heat gained by the metal can be calculated as:
q1 = mcΔT1
where m is the mass of the metal, c is its specific heat capacity (which we need to find), and ΔT1 is the change in temperature of the metal.
The heat lost by the water can be calculated as:
q2 = mcΔT2
where m is the mass of the water, c is the specific heat capacity of water (which is 4.184 J/(g·◦C)), and ΔT2 is the change in temperature of the water.
We know the initial and final temperatures of the metal and water, so we can calculate the changes in temperature:
ΔT1 = (30 ◦C) - (89 ◦C) = -59 ◦C
ΔT2 = (30 ◦C) - (21 ◦C) = 9 ◦C
We also know the masses of the metal and water:
m1 = 33 g
m2 = 43 g
Using the law of conservation of energy, we can set q1 equal to q2 and solve for c:
mcΔT1 = mcΔT2
c = (m2/m1) * (ΔT2/ΔT1) * 4.184 J/(g·◦C)
Plugging in the given values, we get:
c = (43 g / 33 g) * (9 ◦C / -59 ◦C) * 4.184 J/(g·◦C)
c = -0.137 J/(g·◦C)
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URGENT (will give brainliest)
The overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The combustion involves reactants that is 413×4 +498×2=2648 kJ.
Thus, overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.
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Answer the following:
IV. a. C₂H₂
b. C₂H₄
V. a. C₅H₄
b. C₆H₆
VI.
a. Reactants: Na₂SO₄(aq) + Ca(NO₃)₂(aq) Products: CaSO₄(s) + 2NaNO₃(aq). Type of reaction: Double displacement or precipitation reaction.
b. Reactants: Mg(s) + N₂(g) Products: Mg₃N₂(s). Type of reaction: Synthesis reaction.
VII.
a. 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g)
b. Ca₃(PO₄)2(aq) + 6H₃PO₄(aq) → 3Ca(H₃PO₄)₂(aq)
c. 3NaOH(aq) + FeCl₃(aq) → Fe(OH)₃(s) + 3NaCl(aq)
What is the chemical equation about?In part IV, we were asked to write the molecular formula of given compounds based on the given elemental components. For example, acetylene is composed of 2 carbon atoms and 2 hydrogen atoms, so its molecular formula is C₂H₂. Similarly, ethylene has 2 carbon atoms and 4 hydrogen atoms, so its molecular formula is C₂H₄.
Lastly, In part VII, we were asked to balance given chemical reactions. Balancing a chemical equation involves adjusting the coefficients in front of the reactants and products to ensure that the number of atoms of each element is equal on both sides of the equation. For example, in the reaction where solid mercury (II) nitrate is heated to produce liquid mercury, nitrogen gas, and oxygen gas, the balanced equation is 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g). Also, we can balance the other two equations given in part VII by adjusting the coefficients.
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