Why do metals tend to be good conductors of electric current?
A.Metals have more negative charges than positive charges, which produces electric currents.
B.The force of attraction between metal ions and electrons is very weak, causing electrons to flow out of the metal.
C.Valence electrons of metals are very mobile and can carry electric current through the metal.
D.Cations and anions in the metal easily move in opposite directions, carrying electric current
Answer:
C.Valence electrons of metals are very mobile and can carry electric current through the metal.
Explanation:
Metal is made or held together by metallic bonds. Basicaly the valence electrons are free to move through an intire body of metal.
in a compressional wave, when the particles are far apart, what is the part known as
Answer:
The answer is: "Rarefactions"
Explanation:
In a longitudinal wave, particles of the medium vibrate in a direction that is parallel to the direction that the wave travels. Places where particles of a medium crowd closer together are called compressions, and places where the particles spread farther apart are called rarefactions.
can somebody please help me with this question please
Answer: D
Explanation:
An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as the result of its position. When assuming its usual position (i.e., when not drawn), there is no energy stored in the bow. Yet when its position is altered from its usual equilibrium position, the bow is able to store energy by virtue of its position. This stored energy of position is referred to as potential energy. Potential energy is the stored energy of position possessed by an object. https://taraenergy.com/blog/an-introduction-to-potential-energy/
a solution has a pH of 2. What best describes the solution?
a strong acid
a strong base
a neutral solution
a weak base
Minerals are all naturally occurring solid substances with a definable chemical composition. They must also possess ________. Group of answer choices
Answer:Minerals are all naturally occurring solid substances with a definable chemical composition They must also possess what property
Minerals are all naturally occurring solid substances with a definable chemical composition. They must also possess . Two distinct minerals may have the same chemical formula. The most useful diagnostic property of minerals is their color in hand sample.
Explanation:
What volume (in mL) of 0.2600 M HBr is
required to neutralize 40.00 mL of 0.8000 M
NaOH?
The volume of 0.26 M HBr required to neutralize 40 mL of 0.8 M NaOH is 123.08 mL
We'll begin by writing the balanced equation for the reaction. This is given below:
HBr + NaOH —> NaBr + H₂O
From the balanced equation above,
The mole ratio of the acid, HBr (nA) = 1
The mole ratio of the base, NaOH (nB) = 1
From the question given above, the following data were:
Volume of base, NaOH (Vb) = 40 mL
Molarity of base, NaOH (Mb) = 0.8 M
Molarity of acid, HBr (Ma) = 0.26 M
Volume of acid, HBr (Va) =?The volume of the acid, HBr needed for the reaction can be obtained as follow:
MaVa / MbVb = nA / nB
0.26 × Va / (0.8 × 40) = 1
0.26 × Va / 32 = 1
Cross multiply
0.26 × Va = 32
Divide both side by 0.26
Va = 32 / 0.26
Va = 123.08 mLTherefore, the volume the acid, HBr needed to neutralize the base, NaOH is 123.08 mL
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Please help!!
KOH + HBr → KBr + H2O
A student sets up a titration apparatus with 25 mL of potassium hydroxide in the flask. In three to five sentences, explain how the student can use a 0.1 M solution of hydrobromic acid to determine the concentration of potassium hydroxide in the reaction.
A known volume of 0.1 M solution of hydrobromic acid is reacted with 25 mL and the concentration of the potassium hydroxide is calculated from the stoichiometry of the reaction.
Titration is a kind of reaction in which the concentration of an unknown solution is determined by reacting a known volume of this solution with a known volume of a standard solution and carrying out the necessary stoichiometric calculations in order to obtain the concentration of the unknown solution.
To obtain the concentration of the potassium hydroxide solution, 25mL of this solution is reacted with a carefully measured volume of the 0.1 M solution of hydrobromic acid. The volume of 0.1 M solution of hydrobromic acid required to reach end point is used calculate the concentration of the potassium hydroxide solution.
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Which of the following is an example of a ground in a building?
A. A metal rod in the air
B. A pipe to the ground
C. An extra electrical cord
D. A plastic rod
I'll give brainliest to whoever gives the correct answer :D
Answer:
The answer is B
Explanation:
A pipe to the ground
How are force, mass, and velocity related in collisions?
Answer:
force=d/t, n
Mass=v/t
velocity=m/d
Calculate the frequency of 4.1 x 10^-19
A sample of an unknown gas occupies 5.51 L at 1.31 atm. What pressure would thisgas exert in a 0.520 L container if the temperature is held constant?
Answer:
13.9atm
Explanation:
Use Boyle's Law: P1V1 = P2V2
Manipulate the equation: P2 = P1V1/V2
Substitute the values: P2 = (1.31atm)(5.51L)/0.520L
P2 = 13.88096atm
Optionally round to 3 sig figs to get 13.9atm
16. Which is NOT true of an atom obeying the
octet rule?
A. obtains a full set of eight valence electrons
B. acquires the valence configuration of a noble gas
C. electron configuration is unusually stable
D. has an s'p valence configuration
E. will lose electrons
Lures
The statement that is not true in the list of options is that an atom that is obeying the octet rule will loose electrons. An atom that is obeying the octet rule will neither loose nor gain electrons.
According to the octet rule, an atom is stable when it has eight electrons in its outermost shell. We must note that stability of atoms is the driving force for all chemical reactions.
Hence, the statement that is not true in the list of options is that an atom that is obeying the octet rule will loose electrons.
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How many moles are in 2. 5 g of N2? 0. 089 moles 0. 18 moles 1. 3 moles 11 moles.
Answer:
moles = mass divided by molar mass
Molar mass of Nitrogen gas (N2) = 14*2 = 28 g/mol
Mass of Nitrogen gas = 5g
Moles = 5/28
Moles = 0.18 (rounded)
Why would A zoological veterinarian be a good job. DO NOT COPY AND PASTE. please do a paragraph why.
Answer:
it could be a good job because you will get the chance to explore how animals work not only that zoological veterinarian helps animals if they are in danger or needs help immediately. there are much more benefits for zoological veterinarian
What is the coefficient for iodide ions (I-) when the equation is balanced?
Answer:
When the following redox equation is balanced with smallest whole number coefficients, the coefficient for the iodide ion will be __6__.
Explanation:
From the redox equation, we can see that NO₃⁻ is reduced to NO (from oxidation state +5 to +2), whereas I⁻ is oxidized to I₂ (from oxidation state -1 to 0). The half reactions are balanced with H⁺ (acidic solution), as follows:
Reduction : 2 x (NO₃⁻(aq) + 3 e- + 4 H⁺ → NO(g) + 2 H₂O)
Oxidation : 3 x (2 I⁻(aq) → I₂(s) + 2 e-)
----------------------------------------------------------------------
Total equation: 6 I⁻(aq) + 2 NO₃⁻(aq)+ 8 H⁺ → 3 I₂(s) + 2 NO(g) + 4 H₂O
That is the redox equation with the smallest whole number coefficients.
Accordin to this, the coefficient for the iodide ion (I⁻) is: 6.
What is the name of Sn3(PO4)4 under the Stock system of nomenclature?
Answer:
Tin (IV) Phosphate
Explanation:
"Stock nomenclature for inorganic compounds is a widely used system of chemical nomenclature developed by the German chemist Alfred Stock and first published in 1919. In the "Stock system", the oxidation states of some or all of the elements in a compound are indicated in parentheses by Roman numerals."
How many CO2 molecules are in 1 mole of carbon dioxide?
I think there are 6.02 × 10power23 ( Avogadro's constant)
3. What makes water a polar covalent compound?
Answer:
Water is a polar covalent compound since it has Oxygen and Hydrogen which are 2 non-metals and the atoms have an unequal distribution of charge. Oxygen has δ- since it is more electronegative and Hydrogen has δ+. The shape of the water molecule is not symmetrical and dipoles are cancelled out making it a polar covalent compound.
Answer:
it is colourless
Explanation:
its tastleś
dose PLA Plastic float?
Answer:
No, it should sink
Explanation:
2 C4H10+13 O2 = 8 CO2+10 H2O
identify the above chemical reaction type.
how many moles of water are produced when 43 grams of oxygen gas are reacted.
Answer:
This chemical reaction is a combustion.
n = 1.8mol
Explanation:
The ratio of oxygen to water is 13 to 10
The ratio of oxygen to water is also 43 grams to x
Cross multiply: 13x = 430 grams
Isolate x: x = 33.0769g
Remember that n = mass/Molar mass
The molar mass of water is 18.01528 g/mol
n = 33.0769/18.01528
n = 1.836048
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Answer:
this are the topics of biology so you have to learn this topics.
1) An enzyme is a secretion that helps the cell to perform its basic functions.
2) Activation energy is the minimum energy required for a cell to operate.
3) gastritis is an acid secreted by the stomach. it is a very strong acid
Why do automobiles rust more easily in wet climates than drier climates.
Answer:
The iron rusts more easily in wet climates because there is more water in the air, this allows more oxygen to come in contact with the metal to rust.
Explanation:
Match each organism to its part in the food chain.
people:
deer:
horse:
snake:
goldfish:
grass:
lion:
bacteria:
Answer:
Explanation:
Grass. Producer
Goldfish. Pri. Consumer and Herbivores
Deer. Pri. Consumer and Herbivores
Horse. Pri. Consumer and Herbivores
Snake. Sec. Consumer and Carnivores
Lion. Tert. Consumer and
carnivores
People Pri. Sec. and tert. Consumers
Bacteria. Decomposers
Someone pls help me :( tysm if u do
Density is mass/volume.
Let's find the volume.
Volume = lwh = (2)(2)(2) = 8
The volume is 8 and the mass is 16.
D = m/v
D = 16/8
D = 2
2 grams per cm^3
What metal is often extracted and purified from its ore using both smelting and electrolysis?
Answer:
Aluminium
Explanation:
The bauxite is purified to yield a white powder – aluminium oxide (also known as alumina) – from which aluminium can be extracted.
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O, how many grams of magnesium nitrate are produced from 4 grams of nitric acid, HNO3 ?
Round your answer to the nearest tenth. Do not round your answers until the last step of the problem. If you do, the computer might mark your answer incorrect and you will be asked to complete your second trial for this assessment.
Use the following molar masses:
Element Molar Mass
Hydrogen 1
Magnesium 24
Nitrogen 14
Oxygen 16
Answer:
First check to make sure you have a balanced equation
Second use mole ratios to set up what you need to know
Finally convert the moles to grams using the correct molecular weight
I will get you started
According to the reaction above, one mole of Magnesium Nitrate is produced from 2 moles of Nitric Acid
1 mole of Mg(NO3)2/2 moles of HNO3
5 grams of Nitric acid contains
5 g * 1 mole/63 g of Nitric Acid = 0.079365079 moles
Explanation:
For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O,0.0793grams of magnesium nitrate are produced from 4 grams of nitric acid, HNO3.
What is magnesium nitrate ?Magnesium nitrates are inorganic substances with the formula Mg(NO3)2x, where x is one of six, two, or zero. Each one is completely white. The hygroscopic anhydrous substance swiftly transforms into the hemihydrate when exposed to air. In both water and ethanol, all the salts are extremely soluble.
Magnesium nitrate is a crystalline (sand-like), flavourless, colourless, or white substance. Both the production of petrochemicals and pyrotechnics employ it as a catalyst.
The inorganic nitrate salt of magnesium is called magnesium nitrate. It functions as fertilizer. It is a magnesium salt and an inorganic nitrate salt.
Convert the moles to grams using the correct molecular weight
According to the reaction
one mole of Magnesium Nitrate is produced from 2 moles of Nitric Acid
1 mole of Mg ( NO3 ) 2 / 2 moles of HNO3
5 grams of Nitric acid contains
5 g * 1 mole/63 g of Nitric Acid
= 0.079365079 gram
Thus, For the reaction 2HNO3 + Mg(OH)2 → Mg(NO3) 2 + 2H2O,0.0793grams of magnesium nitrate are produced from 4 grams of nitric acid, HNO3.
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Which of the following is NOT a benefit of renewable energy? *
O generates power on smaller scale
O can decrease pollution
O combats climate change
Answer:
O generates power on a smaller scale
Explanation:
The other two options are benefits of renewable energy. You're looking for a con instead of a pro.
A force that is not opposed by an equal and opposite force
Answer:
Balanced Force
Explanation:.
The abiotic components of an
ecosystem are
B. the animals and plants.
A. not important.
D. invisible.
C. nonliving.
Answer:
C. nonliving.
Explanation:
A piece of sodium was cut easily into smaller pieces with a knife. The sodium was added to some water in a trough
The sodium:
.floated
.melated quickly to a silvery ball
.moved on the surface of the water
.fizzed
Answer:
Melated quickly into a silver ball
Answer:
C. melated quickly to a silvery ball
Explanation:
