Answer:
The theory of continental drift is most associated with the scientist Alfred Wegener. In the early 20th century, Wegener published a paper explaining his theory that the continental landmasses were “drifting” across the Earth, sometimes plowing through oceans and into each other.
Explanation:
PLEASE MARK ME AS BRAINLIEST
Answer:
The scientist Alfred Wegener.
Explanation:
Pressure is often defined as
Answer:
Pressure is often defined as a measure of force applied on an area, or over a unit area.
Explanation:
A sodium bromide solution is added to a beaker containing aqueous chlorine. What would happen?
A) Write the complete chemical equation
B) Write the dissociated ionic equation
C) Write the net ionic equation
D) List any spectator ions
Answer:
See detailed explanation.
Explanation:
Hello!
In this case, for the described chemical reaction, we can proceed as follows:
A) For the complete chemical reaction we note down every reacted and produced species as well as the proper balancing process:
[tex]2NaBr(aq)+Cl_2(aq)\rightarrow 2NaCl(aq)+Br_2(g)[/tex]
In which gaseous bromine may give off.
B) The dissociated ionic equation requires the ionization of the aqueous species in ions, expect for chlorine which is not ionized:
[tex]2Na^+(aq)+2Br^-(aq)+Cl_2(aq)\rightarrow 2Na^+(aq)+2Cl^-(aq)+Br_2(g)[/tex]
C) For the net ionic equation we cancel out the sodium ions as they are at both reactants and products:
[tex]2Br^-(aq)+Cl_2(aq)\rightarrow +2Cl^-(aq)+Br_2(g)[/tex]
D) Based on C) we infer that the spectator ions here are the sodium ions.
Best regards!
what does the ideal gas law describe
Answer: the law that the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.An ideal gas is a gas that conforms, in physical behaviour, to a particular, idealized relation between pressure, volume, and temperature called the ideal gas law
Is sodium hydroxide an alkali or an insoluble base
Is mass based on gravity. True or false
Answer:
true mass is based on gravity
Answer:
true
Explanation:
mass based on gravity
17. Find the average atomic mass unit of silicon given the following isotopes and
abundances: Silicon-28, Silicon-29, Silicon-30 with masses of 27.977, 28.976,
29.974, respectively. The percent abundance of the silicon isotopes is 92.2%, 4.7%
and 3.1%, respectively. Periodic table and it’s trends
The average atomic mass unit of Silicon : 28.0774
Further explanationGiven
Isotopes of Si(Silicon-28, Silicon-29, Silicon-30)
Required
The average atomic mass
Solution
Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
Avg. atomic mass = %mass.isotopes 1 + %mass.isotopes 2...etc
Input the values :
Avg atomic mass = (0.922 x 27.977) + (0.047 x 28.976) + (0.031 x 29.974)
Avg atomic mass = 28.0774
The following chemical reaction takes place in aqueous solution:
AgF(aq)+Nal(aq) ——> Agl(s)+NaF(aq)
Write the net ionic equation for this reaction.
The net ionic equation : Ag⁺(aq)+l⁻(aq) ⇒ Agl(s)
Further explanationGiven
Reaction
AgF(aq)+Nal(aq) ——> Agl(s)+NaF(aq)
Required
The net ionic equation
Solution
The equation of a chemical reaction can be expressed in the equation of the ions
In the ion equation, there is a spectator ion that is the ion that does not react because it is present before and after the reaction
When these ions are removed, the ionic equation is called the net ionic equation
AgF(aq)+Nal(aq) ——> Agl(s)+NaF(aq)
Ag⁺(aq)+F⁻(aq)+Na⁺(aq)+l⁻(aq) ⇒ Agl(s)+Na⁺(aq) + F⁻(aq)
Ag⁺(aq)+l⁻(aq) ⇒ Agl(s)
Trey was asked to build a working model of a landform for a science project. He chose to build a model of a volcano.
Trey formed a base out of clay and then painted the model so it resembled a cinder cone volcano.
Finally, Trey mixed baking soda, vinegar, and red food coloring in the base, so it mimicked lava flowing out of the volcano. Once
he was finished with his project, Trey's teacher asked how useful his model was.
What factor best determines the usefulness of the model?
A. how closely the model's color matches the real world
how closely the model's behavior matches the real world
C. how closely the model's size matches the real world
how closely the model's composition matches the real world
B.
D.
Answer:
The answer is "how closely the model's behavior matches the real world "
Explanation:
Your options were glitched out, so it only showed A and C, and B and D were blank so lol
How many moles are in 25.58 grams of H20?
Explanation:
1.42 Moles are there
What is made when a salt is dissolved in water?
A) a precipitate
B) a compound
C) a solution
D) a mixture
Answer:
D.Mixture
Explanation:
When Salt dissolves in water a homogeneous mixture is formed, because the different components are mixed evenly within the substance.
how do you think you can use lenses and mirrors to change the direction and intensity of a light wave?
In table below, there are descriptions of an experiment on samples of three different chemical compounds. Decide whether the compound is ionic or molecular, if you can. If there is not enough information to decide, choose can't decide in the third column.
Compound Description Ionic or molecular?
can't decide
1 Compound 1 is a hard grayish-white solid. A small 250. mg
sample of it is put into a quartz tube and heated strongly.
It starts to melt at 1055. °C.
2 Compound 2 is a hard grayish-white solid. When tapped
gently with a small hammer, a sample fractures into
fragments and a whitish powder. The powder is soluble in
water, and when 15 g are dissolved in 100 mL of water,
the solution conducts electricity well.
3 Compound 3 is a soft waxy white solid that can be easily
shaped and molded by hand. When the flame of an ordinary
laboratory burner is held about 10 cm away from the solid,
it rapidly and extensively melts into a clear liquid.
Answer:
Compound 1- ionic solid
Compound 2- can't really decide
Compound 3- molecular solid
Explanation:
An ionic solid has a very high melting point. It is hard but not brittle. It's solution or melt but not it's solid conducts electricity. Compound 1 is an ionic solid.
We can't really decide on compound 2 since it is brittle yet it's solution conducts electricity.
Lastly, compound 3 is a molecular solid since it has a low melting point.
Answer:
Compound 1- ionic solid
Compound 2- can't really decide
Compound 3- molecular solid
Explanation:
A compound is found to contain 7.962 % silicon , 20.10 % chlorine , and 71.94 % iodine by mass.
a. The empirical formula for this compound is_______ .
b. The molar mass for this compound is 352.8 g/mol. The molecular formula for this compound is:_____
Answer:
A. Empirical formula => SiCl₂I₂
B. Molecular formula = SiCl₂I₂
Explanation:
From the question given above, the following data were:
Silicone (Si) = 7.962 %
Chlorine (Cl) = 20.10 %
Iodine (I) = 71.94 %
Molar mass of compound = 352.8 g/mol
Empirical formula =?
Molecular formula =?
A. Determination of the empirical formula of the compound.
Si = 7.962 %
Cl = 20.10 %
I = 71.94 %
Divide by their molar mass
Si = 7.962 / 28 = 0.284
Cl = 20.10 / 35.5 = 0.566
I = 71.94 / 127 = 0.566
Divide by the smallest
Si = 0.284 / 0.284 = 1
Cl = 0.566 / 0.284 = 2
I = 0.566 / 0.284 = 2
Empirical formula => SiCl₂I₂
B. Determination of the molecular formula of the compound.
Empirical formula => SiCl₂I₂
Molar mass of compound = 352.8 g/mol
Molecular formula =?
Molecular formula = [SiCl₂I₂]ₙ
[SiCl₂I₂]ₙ = 352.8
[28 + (2×35.5) + (2×127)]n = 352.8
[28 + 71 + 254]n = 352.8
353n = 352.8
Divide both side by 353
n = 352.8 / 353
n = 1
Molecular formula = [SiCl₂I₂]ₙ
Molecular formula = [SiCl₂I₂]₁
Molecular formula = SiCl₂I₂
Which of the following does NOT determine local weather patterns?
Answer:
do you have a picture of the choices?
C3H8 + 5 O2 → 3 CO2 + 4 H2O
How many grams of oxygen does it take to produce 90.6 grams of Carbon Dioxide
Answer:
Mass = 112 g
Explanation:
Given data:
Mass of CO₂ produced = 90.6 g
Mass of oxygen needed = ?
Solution:
Chemical equation:
C₃H₈ + 5O₂ → 3CO₂+ 4H₂O
Number of moles of CO₂:
Number of moles = 90.6 g/ 44 g/mol
Number of moles = 2.1 mol
Now we will compare the moles of CO₂ and oxygen:
CO₂ : O₂
3 : 5
2.1 : 5/3×2.1 = 3.5
Mass of oxygen needed:
Mass = number of moles × molar mass
Mass = 3.5 mol × 32 g/mol
Mass = 112 g
A(n)_________contains only one type of atom, whereas a(n)_________ is composed of two or more different elements bonded together. A(n)___________ also contains more than one substance, but these can be separated by physical means, whereas the components of a compound cannot.
Answer:
1. Element
2. Compound
3. Mixture
Explanation:
Elements and compounds are both pure substances. ELEMENTS are substances that contain only one type of atom. For example, Cl2 contains only chlorine atoms. COMPOUNDS, on the other hand, contain atoms of two or more elements that are chemically joined together. For example, CaCl2 contains atoms of calcium and chlorine.
MIXTURES are another kind of substances that contains more than one substances, however, unlike compounds, they are not chemically joined. Mixtures can easily be separated by physical means.
What is true about atomic radius trends on the periodic table?
A. Atomic radius decreases along periods and decreases down groups.
B. Atomic radius decreases along periods and increases down groups.
C. Atomic radius increases along periods and decreases down groups.
D. Atomic radius increases along periods and increases down groups.
It is not b
Answer:
D
Explanation:
Just took the test, Hope this helps!
Answer:
B. Atomic radius decreases along periods and increases down groups.
Explanation:
It decreases in period because of addition of proton effective nuclear charge increase and atomic radius decreases.
Atomic radius increases in group because of addition of shells
According to the following reaction, how many moles of phosphorus trichloride will be formed upon the complete reaction of 25.4 grams of phosphorus (P_4) with excess chlorine gas?
phosphorus (P_4) (s) - chlorine (g) --> phosphorus trichloride (l)
.....moles phosphorus trichloride
Answer:
0.82 mole of PCl₃
Explanation:
We'll begin by calculating the number of mole in 25.4 g of P₄. This can be obtained as follow:
Mass of P₄ = 25.4 g
Molar mass of P₄ = 4 × 31 = 124 g/mol
Mole of P₄ =?
Mole = mass / Molar mass
Mole of P₄ = 25.4 / 124
Mole of P₄ = 0.205 mole
Next, the balanced equation for the reaction. This is illustrated below:
P₄ + 6Cl₂ —> 4PCl₃
From the balanced equation above,
1 mole of P₄ reacted to produce 4 moles of PCl₃
Finally, we shall determine the number of mole of phosphorus trichloride, PCl₃, produced by the reaction of 25.4 g (i.e 0.205 mole) of P₄. This can be obtained as follow:
From the balanced equation above,
1 mole of P₄ reacted to produce 4 moles of PCl₃.
Therefore, 0.205 mole of P₄ will react to produce = 0.205 × 4 = 0.82 mole of PCl₃
Thus, 0.82 mole of PCl₃ was obtained from the reaction.
An idea based on observations with no experimental evidence is a:
HELPPPPPPPPPPPPPPPPPP
Answer:
*helps and doesnt get deleted*
Explanation:
How fast do electromagnetic waves travel? *
A the speed of sound
It depends on how fast the magnet in the generator that produces them is moving
At the speed of light
It depends on how many amps you pass through the coiled wire in the generator that
produces them.
How can scientific themes apply to many branches of science?
A. All types of scientists have agreed on them.
B. The different branches of science are connected.
C. Different themes exist for the different branches.
O D. The themes are all based on the same basic units.
Answer:
b) different branches of science are connected
Answer:
b
Explanation:
a p e x :)
Magnesium and Copper Sulfate react to form Magnesium Sulfate and Copper in the following equation.
Mg + CuSO4 -> MgSO4 + Cu
Answer:
B: Single Displacement Reaction
Explanation:
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
A + BX -> B + AX
For example:
Cation Replacement
Zn + CuCl2 -> ZnCl2 + Cu
Anion Replacement
Br2 + 2Ki -> 2KBr + I2
You just switch either the cation with another anion or switch an anion with another cation.
Hope it helped!
what element has greatest atomic radius from group 3?
Answer:
i think iron
Explanation:
i not sure with my ans
What is the frequency of a photon that has a wavelength of 6.58 x 10-8m?
Answer:
6 x 10 (power to the 15) H2
Answer:
i dont know the answer but you could search up photon calculator, hope this helps (im very sorry i couldnt help but i havent learned about that yet, im in 9th grade)
What is the relationship between the mass of the boat and the mass of the displaced
liquid?
The mass of the boat is equal to the mass of the liquid which is displaced by placing the boat in the liquid.
What is Archimedes' Principle?
Archimedes' Principle states that the buoyant force of the object is equal to the weight of the water which is displaced by the boat. If the weight of the water that is displaced by the boat is less than that of the weight of the boat, then in this case the boat sinks. Archimedes' principle or the buoyant force is very useful for the calculation of the volume of an object that does not have a regular shape.
The mass of the displaced liquid is always equal to the volume of the liquid multiplied by the density of the fluid. When a boat is placed in the water, the volume of displaced water is equal to the mass of the boat which is placed in it.
Learn more about Displacement here:
https://brainly.com/question/11934397
#SPJ2
What is molality mean
Answer:
Molality (m), or molal concentration, is the amount of a substance dissolved in a certain mass of solvent. It is defined as the moles of a solute per kilograms of a solvent.
Explanation:
Look in Dictionary
the man is being warmed by?
radiation
convention
conduction
Answer:
Comvection
Explanation:
The movement causes the density to rise and therefore transfer more heat
Classify each of the observed changes according to whether or not they are likely to represent evidence that a chemical reaction is occurring when performing an experiment.
May be evidence of a chemical reaction Not evidence of a chemical reaction
a solution color becoming less intense
due to dilution
bubbles (sas formation) changes in color
precipitation
explosion or fire
Answer Bank
a solid liquifying change in temperature solution colors mixing
Answer:
a solution color becoming less intense due to dilution- is not an evidence of a chemical reaction
bubbles (gas formation) - evidence of a chemical reaction
explosion or fire - evidence of a chemical reaction
changes in color- evidence of a chemical reaction
precipitation- evidence of a chemical reaction
changes in temperature - evidence of a chemical reaction
a solid liquifying - is not an evidence of a chemical reaction
solution colors mixing - is not an evidence of a chemical reaction
Explanation:
A chemical change is not easily reversible and yields new substances. It is often accompanied by a loss or gain of heat.
In the answer section, i have shown some evidences that lead us to conclude that a chemical reaction has taken place. The occurrence of a chemical change often goes with the formation of new substances as earlier stated and any of these signs may accompany the process.
For instance, when a metal is dropped in dilute acid solution, bubble of hydrogen gas indicates that a chemical reaction has taken place.
WILL GIVE BRAINLIEST
Answer:
1. True
2. resting position
3. 5 cm
4. Compressions
5. false
6. 7 m
7. true
8. second one has more amplitude
9. True
10. true
Explanation: