Answer:
1. 48 2. uhhh molar mass of gold/avogadro's number = 4 moles so guess
Explanation:
Answer:
1. 48 2. uhhh molar mass of gold/avogadro's number = 4 moles so guess
Explanation:
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
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.
Car 1 has a body made from aluminium and car 2 has a body made from steel. Which car is likely to
have the better fuel economy?
Answer:
1
Explanation:
Um well if a car is made out aluminum keep in mind the engine = heat and stuff the type of stuff that would burn would cause chemicals/ white flame to form the trioxide aluminum(lll) oxide, Al small 2 O small 3. With Steel this would burn off bits of rust/ion oxide
I could be wrong but thats the best answer i can give sorry mate
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.
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.
Which of the following would support the theory that electrons are identical for all elements?
Answer:
what are the following?
1. Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?
A) Be.
B) Mg.
C) Ca.
D) Sr.
2. Which element has a larger atomic radius than sulfur?
A) Chlorine.
B) Cadmium.
C) Fluorine.
D) Oxygen.
3. Which ion was formed by providing the second ionization energy to remove an electron?
A) Ca2+.
B) N3–.
C) Fe3+.
D) S2–.
4. The most negative electron affinity is most likely associated with which type of atoms?
A) Large nonmetal atoms.
B) Small nonmetal atoms.
C) Large metal atoms.
D) Small metal atoms.
5. Selected properties of antimony (Sb) and iodine (I) are listed in the table below.
Element AtomRadius(pm) 1st IonEnergy(kJ/mol) ElectroAffinity(kJ/mol) Electronegative
Sb 145 ? –103 2.05
I 140 1008 –295 ?
Which predictions can most likely be made?
Sb has a lower ionization energy but a higher electronegativity than I.
Sb has a higher ionization energy but a lower electronegativity than I.
Sb has a lower ionization energy and a lower electronegativity than I.
Sb has a higher ionization energy and a higher electronegativity than I.
6. Which correctly summarizes the trend in electron affinity?
A) It tends to be very high for group 2.
B) It tends to be more negative across a period.
C) It tends to remain the same across periods.
D) It tends to be more negative down a group.
7. Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
A) The ionization energy decreases because the ratio of the protons to electrons increases.
B) The ionization energy increases because the ratio of the protons to electrons increases.
C) The ionization energy decreases because the ratio of the protons to electrons decreases.
D) The ionization energy increases because the ratio of the protons to electrons decreases.
8. Which element would most likely have an electron affinity measuring closest to zero?
A) Na.
B) Al.
C) Rb.
D) Ar.
9. Electronegativities of the elements Na, Al, P, and Cl follow a specific trend across the period. Based on this trend, an electron will be most strongly attracted to
A) Na.
B) Al.
C) P.
D) Cl.
10. Which best describes ionization energy?
A) Energy needed to add an electron to a neutral atom in the gas phase.
B) Energy needed to add an electron to a neutral atom in the liquid phase.
C) Energy needed to remove an electron from an atom or ion in the gas phase.
D) Energy needed to remove an electron from an atom or ion in the liquid phase.
Answer: B D B A C B E D A B
Explanation:
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.
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 :)
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:
https://brainly.com/question/29775886
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According to kelper, which planet travels the fastest.
1. Earth
2. Jupiter
3. Mercury
4. Neptune
Which animals/insects look different from their young?
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.
What is the yearly exposure from wearing a watch with a luminous dial?
Explain why atoms increase in size when the atom gains electrons.
16. Why do the atoms of H, O, N, F, CI, I, and Br have tendencies to bond with themselves?
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)
please answer the (a)
Answer:
a) 30
b) 45
Explanation:
how many moles of sodium chloride are in a 122 gram sample
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:
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
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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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:
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 :)
Atoms of which two elements have a combined total of 23 protons?
A.Sodium, Na, and magnesium, Mg
B.Boron, B, and carbon, C
C.Copper, Cu, and zinc, Zn
D.None of these
Answer:
A
Explanation:
Sodium has 11 electrons and Magnesium has 12 electrons. Since here you need to consider atoms, they must have equal amount of protons as electrons to be considered neutral, and so an atom.
So simply 11+12 =23
How many elements are in this chemical formula?
2(NH4)2SO4
Your answer
Answer:
4
Explanation:
Nitrogen (N)
hydrogen (H)
sulfur (S)
oxygen (O)
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
1. If a cell has waste it needs to store, it will store it:
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.
i need help please this is due today