Answer:
Static Electricity.
Explanation:
Static electricity is defined as 'an electric charge that has built up on an insulated body, often due to friction.' It is an outcome of the disparity among the positive, as well as, negative charges residing in a body or object and causes the charge to build up on the surface of the body. The accumulation of electric charges on the objects like wool, hair, silk, plastic, etc. causes them to possess static electricity. These charges stay on the surface until it is discharged or released through a source. Thus, 'static electricity' is the correct answer.
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Balance the following equation. What is the coefficient for hydrogen fluoride?
SiO2 + HF →→SiF4 +H2O
A) 3
B) 2
C) 1
D) 4
Answer:
ans .4
Explanation:
SiO2 +HF ⇒ SiF4 +H2O
reactant side product side
Si = 1 Si = 1 its balanced
O = 2 O = 1 (× WITH 2 ) we got O =2 And H = 4
H = 1 H = 2 NOW H =4
F= 1 (×4) F = 4
now we get SiO2 +4 HF ⇒SiF4 +2 H2O
After multiply with number again check it. Si = 1, O = 2 ,H=4 ,F=4
The coefficient for hydrogen fluoride is 4.
The correct option is D, 4.
What is hydrogen fluoride?It is a chemical compound with chemical formula HF.
It is a colorless gas or liquid.
[tex]\rm SiO_2 +HF = SiF4 +H_2O[/tex]
We will calculate the moles of compounds on both side
Reactant side Product side
Si = 1 Si = 1 its balanced
O = 2 O = 1 (multiply it by 2)
o =2 and H = 4
H = 1 H = 2 NOW H =4
F= 1 (×4) F = 4
The balanced equation is
[tex]\rm SiO_2 +4 HF =SiF_4 +2 H_2O[/tex]
Thus, The coefficient for hydrogen fluoride is 4.(D).
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Why does shaking the drink crystals in a water bottle help the solute dissolve faster?
Answer:
Shaking exposes the salts to the solvent more quickly. Shaking helps more water evaporate. Shaking equalizes the water temperature. Shaking causes more ions to precipitate out of solution.
Explanation:
is a lab formed emerald a mineral? why or why not?
they dont have geology subject so
Answer:
No, it is not a mineral
Explanation:
Emerald is an important gemstone. It is famous for its green colour. Emerald is one of the most valuable gemstones. It is very much useful in the production of jewelry.
Emerald can be created in the laboratory. Such laboratory created emerald are still regarded as real emerald but they are not minerals. Only naturally occurring emeralds are minerals.
A. Reaction with what gas in the atmosphere makes natural rain water slightly acidic? (2 points)
B. Describe the chemical reactions that occur to change sulfur to sulfuric acid. (2 points)
C. How much more acidic is acid rain water with a pH of 2 than unpolluted rainwater with a pH of 6? Use your knowledge of pH (not the information provided in this article) and show your work. (2 points)
Answer:
See explanation
Explanation:
On the pH scale acidity ranges from pH values of 0-6.9. Natural rain water is slightly acidic due to the presence of carbon dioxide in the atmosphere which is an anhydride of carbonic acid.
CO2(g) + H2O(l) -------> H2CO3(aq)
B. The equations that turn sulfur to sulfuric acid are;
S(l) + O2(g) -----> SO2(g)
2SO2(l) + O2(g) -----> 2SO3(g)
SO3(g) + H2SO4(l) -----> H2S2O7(l)
H2S2O7(l) + H2O(l) ----> 2H2SO4(l)
-
At pH 6, H^+ concentration = 1 * 10^-6 M
At pH 2, H^+ concentration = 1 * 10^-2 M
Hence;
1 * 10^-2/1 * 10^-6
= 10^4 times more acidic
Which of these models shows the position of the sun moon and Earth that will have the LARGEST effect on the tides? _________
Answer: Your answer is J
Explanation: This can occur when moon is closest to earth.
So the moon in between earth and sun.
Also factually the moon can effect human behavior, because humans are made up of some percent of water.
Which best explains the importance of indicator species?
Answer:
Explanation:
ndicator species (IS) are animals, plants, or microorganism used to monitor changes in our environment. For example, they can tell us about the impact of pollution on an ecosystem, or how well an impaired environment is being managed or restored.
Do all materials respond to heat in the same way?
Answer:
No.
Materials like water get evaporated when heated, but materials like camphor get sublimed that is they directly get converted into gaseous form when heated, while materials like copper gets melted on heating
Who likes Science, Biology, Chemistry and physics ..? what is the similar to all of the following subjects..?
Answer:
Explanation:
They're all forms of science!
what is the mass of 0.23 moles of CF4? *
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Answer:
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Weather conditions (high or low temperature) to the mineral wool.
Answer:
high temperature
Explanation:
When a sound is louder what
measurement gets bigger?
Answer:
amplitude or pitch
Explanation:
A teacher sprinkles some iron shavings on a clear tray . She places two magnets in the shavings with the north ends facing each other . Based on the cause-and-effect relationship between the magnets, which phenomenon is the teacher modeling for her students ?
Answer:
Field of repulsion.
Explanation:
An experiment can be defined as an investigation which typically involves the process of manipulating an independent variable (the cause) in order to be able to determine or measure the dependent variable (the effect).
This ultimately implies that, an experiment can be used by scientists to show or demonstrate how a condition causes or gives rise to another i.e cause and effect, influence, behavior, etc in a sample.
Cause and effect can be defined as the relationship between two things or events in which an occurrence one (cause) leads to the occurrence of another (effect).
In this scenario, a teacher sprinkles some iron shavings on a clear tray. She places two magnets in the shavings with the north ends facing each other. Based on the cause-and-effect relationship between the magnets, the phenomenon the teacher is modeling for her students is field of repulsion.
Generally, the two north ends of a magnet have the same polarities and as such are considered to be like charges.
Hence, the field of repulsion is a phenomenon that is based on the fact that like charges repel while unlike charges attract. Thus, the north end of a magnet would repel the north end of another magnet placed beside it.
3.0 moles of BaO are mixed evenly into a 2.0 L. What is the molarity of this
solution?
Answer: 1.5 moles/L
Explanation:
Molarity = moles/ Liters
to find the molarity of BaO: 3moles/2L = 1.5 moles/L
Is browning and producing new flavor compounds as something cooks a chemical or a physical change?
Answer:
I believe it is a chemical change
Explanation:
because it is changing into something new
How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C. Also asks to identify the P, V, N, R, and T. If unknown then put "?"
We have that for the Question "How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C." it can be said that Moles of gas is
n= 0.059 moles of gas
From the question we are told
How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C. Also asks to identify the P, V, N, R, and T. If unknown then put "?"
Generally the equation for the is mathematically given as
[tex]P=\frac{600}{760}\\\\P=0.789atm[/tex]
Therefore
[tex]n=\frac{PV}{RT}\\\\Therefore\\\\n=\frac{PV}{RT}\\\\n=\frac{0.789*2.2}{0.08206*(85 + 273)}\\\\[/tex]
n= 0.059 moles of gas
Therefore
Moles of gas is
n= 0.059 moles of gas
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has 2 valence electrons. It has electron shells and is reactive than Boron. This element has the same number of electron shells as has 4 valence electrons. It has electron shells and is reactive than Aluminum. This element has the same number of electron shells as
Answer:
Beryllium.
Silicon.
Explanation:
Beryllium has 2 electrons in their outermost shell and has highly reactive than boron because Boron needs 3 electrons to lose whereas, beryllium needs to lose only 2 electrons to get stability. Silicon has 4 electrons in its outermost shell and is less reactive than aluminum because aluminum has to lose 3 electrons to get stability as compared to silicon which needs 4 electrons to lose to be stable and non-reactive.
When two continental plates diverge, there is a valley in between these two plates that forms as the continental crust widens. What geological event is
a result of this interaction?
A) Hurricanes
B) Volcanoes
C) Tsunamis
D) Earthquakes
Answer:
B. Volcanoes
Explanation:
B. Volcanoes
Answer:
B:Volcanoes
Explanation:
because valley rift develops
The compound that forms between nitrogen and chlorine is
a. ionic
b. molecular/covalent
Answer:
Covalent bonding is a type of chemical bonding which is characterized by atoms sharing electrons. For nitrogen and chlorine to covalently bond, nitrogen needs 3 electrons. Chlorine only has one electron therefore two more chlorine molecules are needed. Because one atom of nitrogen needs 3 atoms of chlorine to bond, the formula will be NCl3.
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How does the water help a fossil form?
The answer is 1
Four identical flasks, at the same temperature and pressure, contain the gases CH4, H2, CO2 and Kr respectively. Which flask contains the greatest number of particles?
H2
CH4
CO2
Kr
all are the same
Answer:
All the gases have the same number of molecules.
I need help with this!
Answer:
FILTRATION.
filter the solution and separate sand and salt solution
evaporation
evaporate the water and salt mixture and salt will be left as a solid
How many grams are in 2.0 x 10-5 moles of uranium?
Answer choices
5.3 x 10-3 grams
4.8 x 10-3 grams
1.4 x 10-3 grams
2.2 x 10-3 grams
Answer:
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explain how the albedo of a surface area would affect the climate in both seasons
Answer:
Albedo affects the climate by controlling the amount of radiation a particular planet absorbs, weather can also depend on how much the earth absorbs radiation in case of the earth.
.
What's the similarity between Gas and Liquid?
Answer:
Liquids and gases flow easily because their particles can move or slide past one another.
Explanation:
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Identify this reaction
HBr+ Al(OH)3 —-> H2O + AlBr3
Neutralization reaction
Hello, in the following reaction HBr is strong acid when reacts with Amphoteric Aluminium hydroxide gives water & AlBr3 as salt.
We know that in neutralization reaction
acid & bases reacts to give salt and water. Hence following reaction is neutralization reaction.
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Calculate the percent yield if the theoretical yield is 50.0 g of a
product and the actual yield is 42.0 g.
Answer:
84% yield
42/50 = 0.84 = 84%
Which of the following is the main cause of acid rain?
water vapor
photosynthesis
ozone depletion
smog
Answer:
photosynthesis
Explanation:
Answer:
Photosynthesis
Explanation:
I had it on a quiz.
2. A clear, colorless liquid is mixed with a clear, blue liquid resulting in a white powder suspended in a clear,
colorless liquid. Has a chemical reaction occurred? Why or why not?
Answer:
Yes, a chemical reaction has occurred
Explanation:
A chemical change is known to lead to the appearance of a new substance. Another name for chemical change is chemical reaction.
The new substance is formed when the bonds in the reactants are being rearranged to yield the products of the reaction.
In this case, two clear liquids were mixed and the contents of the system interacted briefly to yield a new product which appears as the white powder suspended in a clear, colorless liquid.
Which of these describes the flow of energy as rock salt is dissolved in water?
Answer:
When salt dissolves in water, sodium and chloride ions are pulled apart to form new weak bonds with water molecules. Pulling them apart takes energy, while forming new bonds with the water molecules releases energy. Hope it helped (=^･ｪ･^=)