Which of the following is a homogeneous mixture?
A. beef stew
B. melting
C. rusting
D. cutting

Answer:

The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.

Explanation:

Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy

Explanation:

Answer:

endothermic; the dough absorbs heat

Explanation:

EDG2020

Answer:

this reaction is so the answer should be A

Answer:

in heat transfer, as the fluid flows along the tube, the wall layers are heated or cooled. temp. variation occurs in the wall layers.

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Answer:

option 2

Explanation:

Answer:

first one

Explanation:

The formula of calcium carbonate is CaCO3

The formula of nitric acid is HNO3.

When put together:

CaCO3 + HNO3 = Ca(NO3)2 + CO2 + H2O

The balanced equation:

CaCO3 + 2HNO3 = Ca(NO3)2 + CO2 + H2O

Answer:

by wearing of rocks

Explanation:

earths gravity your welcome

Answer:

weathering of rocks is the answer to your question

Explanation:

The reaction is CaCO

3

+2HCl→CaCl

2

+H

2

O+CO

2

.

Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.

Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×

2

1

=1.5 mol of carbon dioxide

Answer:

c

Explanation:

there will be displacement reaction taking place

Answer:

there will be no reaction

Explanation:

there will be no reaction since calcium does not displace zinc

Answer:

[tex]\boxed {\boxed {\sf M \approx0.864 \ M \ HBr}}[/tex]

Explanation:

The molarity of a solution is the moles per liter. It is found using this formula:

[tex]M=\frac { moles \ of \ solute}{liters \ of \ solution}[/tex]

First we must calculate moles, since we are given grams. To convert from grams to moles, the molar mass is used. This is also given to us, it is 80.91 grams per mole. We can use it as a ratio.

[tex]\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]

Multiply by the given number of grams.

[tex]314.5 \ g \ HBr *\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]

Flip the fraction so the grams of HBr cancel.

[tex]314.5 \ g \ HBr *\frac {1 \ mol \ HBr}{80.91 \ g \ HBr}[/tex]

[tex]\frac {314.5 \ mol \ HBr}{80.91 }=3.88703497714 \ mol \ HBr[/tex]

Now we know the moles, and can calculate the molarity.

There are 3.88703497714 moles of solute and 4.50 Liters of solution.

[tex]M= \frac {3.88703497714 \ mol }{ 4.50 \ L}[/tex]

[tex]M= 0.863785550476 \ mol/ L[/tex]

The original measurements have 4 and 3 significant figures, so we use the lowest number of 3 for our answer. For the number we calculated, that is the thousandth place.

The 7 in the ten thousandth place tells us to round the 3 to a 4.

[tex]M \approx 0.864 \ mol/ L[/tex]

[tex]M \approx 0.864 \ M \ HBr[/tex]

The molarity of the solution is about 0.864 M HBr.

Show the bolded items and the boxes.

Answer:

During a total lunar eclipse, the Earth lies directly between the sun and the moon, causing the Earth to cast its shadow on the moon.

Explanation:

Answer: Cs because its further to the right on the table, meaning its more reactive.

Explanation:

Answer:

Cs

Explanation:

This element is the farthest right, and lowest meaning that its reactivity is very high.

1. valence electrons and electronegativity

2. Both reactivity and electronegativity decrease down a group.

3. Electronegativity decreases down a group and reactivity increases down a group.

4. The number of valence electrons increases from left to right.

5. Cs

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Answer:

Europium/Eu ( not really sure )

The lanthanide element with the least mass is Lutetium (Lu)

Lutetium (Lu) is a member of the lanthanide series, which is a group of 15 elements located in the f-block of the periodic table. The lanthanide series starts with the element Lanthanum (La) and ends with Lutetium (Lu). Lutetium is the heaviest and most dense element in the lanthanide series. Lutetium has an atomic number of 71, indicating that it has 71 protons in its nucleus. It has a relatively high atomic mass of approximately 174.97 atomic mass units (u) according to the periodic table.

Hence, lutetium is the lanthanide element with the least mass.

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Answer:

the pressure exerted in pascals is 0.5 Pa

Explanation:

The computation of the pressure exerted in pascals is shown below:

As we know that

Pressure = force ÷ area

= 25 ÷ 50

= 0.5 Pa

Hence, the pressure exerted in pascals is 0.5 Pa

We simply applied the above formula so that the correct pressure could come

Answer:

When a small amount of external energy in the form of light is applied to the conductor, the valence electrons gain enough energy from the light to break the bonding with the atom and they jumps into the conduction band.

The effect of light on valence bis absent negative charges in the valence band, correspond to electrons elevated to the conduction band. When the semiconductor is lit, current flow is increased by both electrons and holes.

The outermost or valence shell electrons, known as valence electrons, are crucial because they shed light on an element's chemical characteristics and are the ones that are acquired, lost, or shared during a chemical reaction.

In general, when an atom's outermost electron shell is full, it is at its most stable and least reactive.

Thus, The valence electrons get enough energy from the light to break their link with the atom and move into the conduction band when a modest amount of external energy in the form of light is delivered to the conductor.

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Answer:

C are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ion

Explanation:

Calcium is a meta and Oxygen is a non metal. The bond that forms between a metal and a non metal is an ionic bond. In an ionic bond, the metal loses electrons while the non metal gains the electrons; hence there is transfer of electrons.

Calcium belongs to group 2 and oxygen needs 2 more electrons to complete it's electronic configuration.

Calcium would lose two electrons to form Ca+2 and oxygen would gain two electrons to form O-2 ion

The correct option is;

C. are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ion

Answer:What should you do if you realize during research that your original theory is wrong

Explanation:

Answer:

Physicians do not have to treat every ill patient. However they must uphold their ethics (eg. do no harm, confidentiatlity, etc.).

Explanation:

Primary source:

Hippocratic Oath (translation since it's originally in Greek)

I swear by Apollo the physician, and Asclepius, and Hygieia and Panacea and all the gods and goddesses as my witnesses, that, according to my ability and judgement, I will keep this Oath and this contract:

To hold him who taught me this art equally dear to me as my parents, to be a partner in life with him, and to fulfill his needs when required; to look upon his offspring as equals to my own siblings, and to teach them this art, if they shall wish to learn it, without fee or contract; and that by the set rules, lectures, and every other mode of instruction, I will impart a knowledge of the art to my own sons, and those of my teachers, and to students bound by this contract and having sworn this Oath to the law of medicine, but to no others.

I will use those dietary regimens which will benefit my patients according to my greatest ability and judgement, and I will do no harm or injustice to them.

I will not give a lethal drug to anyone if I am asked, nor will I advise such a plan; and similarly I will not give a woman a pessary to cause an abortion.

In purity and according to divine law will I carry out my life and my art.

I will not use the knife, even upon those suffering from stones, but I will leave this to those who are trained in this craft.

Into whatever homes I go, I will enter them for the benefit of the sick, avoiding any voluntary act of impropriety or corruption, including the seduction of women or men, whether they are free men or slaves.

Whatever I see or hear in the lives of my patients, whether in connection with my professional practice or not, which ought not to be spoken of outside, I will keep secret, as considering all such things to be private.

So long as I maintain this Oath faithfully and without corruption, may it be granted to me to partake of life fully and the practice of my art, gaining the respect of all men for all time. However, should I transgress this Oath and violate it, may the opposite be my fate.

Answer:

it is the second one. Lead

Answer:

B: Base

Explanation:

Correct

In acid-base reaction, h20 is the Base.

The reaction HCl(aq) + H2O(l) H3O+(aq) + Cl(aq) - HCl gives water a proton. HCl is an acid as a result. A proton is taken up by H2O from HCl. H2O is a base as a result.

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Answer:

you have to decide 865,000 with 1000 and the answer is 865

Answer: voltage drops in each resistor ΔU= RI

Explanation: if lamps or other resistor which cause load are in series in

Electric circuit, current I passing circuit is same. Voltage decreases

In every resistor

Answer:

A scientists who studies how water moves around is called "Hydrologist".