0.94Answer:
Explanation:
TO find the number of moles in a substance given its number of
entities we use the formela
How many grams of H2O are in 34.2 grams of NAOH
Need ASAP
Answer:
15.438g H2O
Explanation:
First you need to find the reaction equation:
2H2O+2Na=2NaOH + H2
Hydrogen is a diatomic molecule so it will have a subscript of 2 on the right hand side. From there we can balance the reaction.
Then we can use stoichiometry:
34.2g NaOH * (1 mol NaOH/39.908g NaOH) * (2 mol H2O/2 mol NaOH) * (18.015g H2O/1 mol H20) = 15.438g H2O
It is important that when you use stoichiometry that all your units cancel out until you only have the unit you want.
A company needs a substance for a new product that is a good electrical insulator, is lightweight, and can withstand high pressures. Which type of scientist should the company contact for help? Choose the correct answer.
geophysicist
organic chemist
material scientist
analytical chemist
The company should contact with a material scientist to better know which materials can provide the needs that they demand. Hence option c is correct.
Who are material scientists ?The chemical composition and structure of many man-made and natural materials are investigated and analyzed by materials scientists. In order to learn more or acquire new information, glass, rubber, ceramic, alloys, polymers, and metals are all explored and investigated.
Using what they have learnt, materials scientists then come up with methods to mix materials, reinforce existing materials, or develop whole new materials with specific features and characteristics for usage in a variety of applications and products.
A materials scientist develops techniques for evaluating certain materials to find out how they react to various environmental factors. They also design laboratory tests to assess the plausibility of methods and processes used to produce novel materials with enhanced properties.
Therefore, the company have to contact a material scientist.
Find more on material science:
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Explain why atoms increase in size when the atom gains electrons.
Which of the following would support the theory that electrons are identical for all elements?
Answer:
what are the following?
According to kelper, which planet travels the fastest.
1. Earth
2. Jupiter
3. Mercury
4. Neptune
Convert 2.44 grams of CO2 to molecules.
Answer:
0.055
Explanation:
Not 100% sure this is right but this is how I got it:
1 mol * 2.44 grams/44.0095 g/mol (44.0095 is one mole of CO2)
The weight of a box having a mass of 100 kg is N.
Explanation:
weight= mass* 9.8N
100 kg mass weighs about 980 Newtons on Earth.
O energy flowing from the
krill to the blue whale
What is the form of energy that the blue whale consumes when it eats the point
krill that helps it survive?
thermal
radiant
Chemical
Answer:
thermal
Explanation:
How many elements are in this chemical formula?
2(NH4)2SO4
Your answer
Answer:
4
Explanation:
Nitrogen (N)
hydrogen (H)
sulfur (S)
oxygen (O)
What is the yearly exposure from wearing a watch with a luminous dial?
Fill in the blank with the correct number to balance the equation 4Cr +3O2 -> CR2O3 (enter only a whole number)
Answer:
The balanced equation is given below:
4Cr + 3O₂ —> 2Cr₂O₃
Explanation:
From the question given above the following equation was obtained
4Cr + 3O₂ —> Cr₂O₃
The equation can be balance as illustrated below:
4Cr + 3O₂ —> Cr₂O₃
There are 4 atoms of Cr on the left side and 2 atoms on the right side. It can be balance by writing 2 before Cr₂O₃ as shown below:
4Cr + 3O₂ —> 2Cr₂O₃
Now the equation is balanced.
Which animals/insects look different from their young?
Which of the following materials has the highest density?
A. O water vapor
B. O steam
C. O liquid water
D. O ice
Answer:
Answer is C. liquid water.
Explanation:
I hope it's helpful!
Liquid water has the highest density. Therefore, the correct option is option C among all the given options.
What is density?The density of a substance is defined just like its weight per unit volume. In other words, density is the mass-to-volume ratio or mass for every unit volume. It quantifies how much "stuff" a thing possesses in an unit volume (cubic meter or cubic centimeter).
Density is a measure of how closely stuff is packed together. The density principle was established by the Greek scholar Archimedes, which is simple to compute if one know the equation and its associated units. Lquid water has the highest density.
Therefore, the correct option is option C among all the given options.
To learn more about density, here:
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An atom has 9 protons and 7 electrons. What is its overall charge?
Answer:
Positive
Explanation:
If an atom has more protons than electrons, its overall charge will be positive. Protons have a positive charge, electrons have a negative charge.
PLEASE HELP DUE BY FEB 4TH PLEASE HELP PICTURE IS ATTACHED
Answer:
4. is the troposphere
5. is the lithosphere
6. is the hydrosphere
7. this would be lithosphere (land), hydrosphere (water), biosphere (living things) and atmosphere (air)
8. this would be the goesphere and atmosphere.
note: hope this helps :)
Chemical reaction type
Al2(co3) al2o3 +
Type of reaction : The decomposition reaction
Further explanationGiven
Reaction
Al₂(CO₃)₃ → Al₂O₃ + 3CO₂
Required
Type of reaction
Solution
The decomposition reaction in a chemical reaction shows the decomposition reaction of a compound into its constituent elements or compounds
So 1 compound breaks down into 2 or more compounds
The general formula :
AB ⇒ A + B
Wich meteor shower can be seen December 28-january 12
A Geminids
B Leonids
C Perseids
D Quadrantids
this is for astronomy
Answer:
A Geminids
Explanation:
If more solvent is added to a solution:
A.the solution becomes less dilute
B.the molarity decreases
C.the molality increases
D.the percent (v/v) increases
Answer:
The answer would be A
Explanation:
If more solvent is added, the solution becomes unsaturated because in principle it is capable of dissolving more solute.
how many moles of sodium chloride are in a 122 gram sample
9 of 16
9.
A student drops a ball from 5 feet above the ground. After bouncing once, it only reaches
a maximum height of 4 feet above the ground.
Use energy terms to explain why the ball did not reach its original height after bouncing
once.
A. Some energy was lost
B. Some energy was transferred to the floor and air
C. Some energy disappeared when it hit the floor
D. Some energy was destroyed
what are ions and how do they work please send me answer
Answer:
hope it helps
please mark me brainliest
Explanation:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
Pluto has a diameter of 2 300 km.
How does this information suggest to scientists that Pluto is not a planet
Explanation:
it is too small to be a planet as the avrage planet size
can be around 20,000 the smallest planet in the solar system mercurey has more than pluto
Which of the following is a problem caused by acid rain?
1 -is a factor in global warming
2-causes depletion of the ozone layer
3-respiratory problems in humans
4-makes lakes and streams unsuitable aquatic life
Answer:
1
Explanation:
is a factor in global warming
Answer:
sulfur dioxide from coal fired plants in Tennessee
Explanation:
Got it right on the quiz :)
2. In the space below, describe why it rains. Include the words that scientists use
when talking about how water changes from liquid to gas and back to liquid
again
16. Why do the atoms of H, O, N, F, CI, I, and Br have tendencies to bond with themselves?
i need help please this is due today
ok so i haven't been on this in a long time ig and so i don't know i just need help on this so i can play my fav video game oof
A hockey puck was sliding across the ice at a constant speed when it was hit with a hockey stick.
Which changes could result from the application of force from the hockey stick?
No change will occur because the forces are balanced.
The hockey stick will experience balanced forces when it comes in contact with the puck.
The new force will add to the existing unbalanced forces of the sliding hockey puck.
There will be a change of direction and/or speed from the unbalanced forces.
Answer:
J
Explanation:
its J
Which of the following atoms could an alkaline earth metal (family 2) form an ionic bond with? Sulfur Argon Sodium
Explain your answer. __________________________________________________________
_______________________________________________________________________________
Answer:
Sulfur (but not argon or sodium.)
Explanation:
In an ionic bond, one atom would completely lose one or more electrons while the other atom would completely gain those electrons.
For that to happen, the first atom needs a strong tendency of losing electrons. The second atom needs a strong tendency of gaining electrons.
Atoms of metals tend to lose electrons. On the other hand, atoms of nonmetals tend to gain electrons.
Alkaline earth metals (IUPAC group [tex]2[/tex]) include elements such as magnesium and calcium. Like many other metals, alkaline earth metal atoms tend to lose electrons. Atoms of elements that form ionic bonds with alkaline earth metal atoms should tend to accept electrons.
Among the choices for the other element in this ionic bond:
Sodium is an alkaline metal. Sulfur is an IUPAC group [tex]6[/tex] non-metal. Argon is a noble gas.Because sodium is a metal, it is unlikely that sodium would accept electrons from alkaline earth metal elements. Rather, sodium might form an alloy (with metallic bonds rather than ionic bonds) when melted and mixed with alkaline earth metals.
Sulfur is a non-metal and is right under oxygen in group [tex]6[/tex] of the periodic table. Like atoms of other nonmetals in that group, sulfur atoms tend to gain electrons and could readily form ionic bonds when mixed with alkaline earth metal elements.
Argon is a noble gas. Noble gas elements are considerably chemically inert. They seldom react with other elements. Even if they do so, they tend to form covalent bonds rather than ionic bonds. In practice, alkaline earth metals such as calcium may even be stored in containers filled with argon to prevent the metal from reacting with oxygen in the air.
please answer the (a)
Answer:
a) 30
b) 45
Explanation:
A process that releases heat, such as freezing or condensation is called?
Answer:
exothermic
Explanation:
An exothermic reaction gives off heat energy. Condensation is the process by which water vapor turns into liquid water. This typically occurs when water vapor molecules come into contact with cooler molecules. This causes the water vapor molecules to lose some energy as heat which is a exothermic reaction.
When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.