Answer:
i assume that it would be a gametophyte.
Explanation:
A chemical reaction takes place in a closed system. The mass of the reactants before the reaction was 35 grams. What must the mass of the products of the reaction be, according to the law of conservation of mass?
Chemistry question just two
Answer:
14:Function 18:evaporation and distillation
The technology of sesimograph is helpful to humans because it
Answer:
Explanation:
Seismographs can detect quakes that are too small for humans to feel. During an earthquake, ground-shaking seismic waves radiate outward from the quake source, called the epicenter. Different types of seismic waves travel at different speeds and through different parts of the Earth during a quake.
Find the mass of 2 moles of:
1. Oxygen atoms
2. Oxygen molecules
Answer: 1. 2 moles of oxygen atoms = 32 grams
2. 2 moles of oxygen molecules = 64 grams
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number of particles.
1 mole of oxygen atom (O) weighs = 16 g
Thus 2 moles of oxygen atom (O) weighs = [tex]\frac{16}{1}\times 2=32 g[/tex]
Also 1 mole of oxygen molecule [tex](O_2)[/tex] weigh = 32 g
Thus 2 moles of oxygen molecule [tex](O_2)[/tex] = [tex]\frac{32}{1}\times 2=64 g[/tex]
The offspring of sexual reproduction typically ----.
A. develops genetic material independent of any other source
B.gets all of its chromosomes from one parent
C.gets more of its chromosomes from one parent than the other
D.gets half of its chromosomes from each parent
Antoine put some metal into a container with air. He closed the container. He measured the weight of the closed container with the metal; it weighed 250 grams. Then he heated the container until the metal changed colors. He weighed the closed container after heating. Predict the weight of the closed container (greater than 250 grams, equal to 250 grams, less than 250 grams) after heating. Enter your answer in the space here.
Answer:
the same
Explanation:
due to the law of conservation of mass, the mass will not change
Answer: The mass will be the same it will not be able to change.
Explanation: due to the law of conservation of mass, the mass will not change telling us that the mass and the grams or whatever it was saying on there will stay exactly no change. so the 250 grams will not change.
Which of the following best describes the formation of waves?
Question 2 options:
wind transfers energy to the ocean, creating waves
ocean transfers heat energy which creates wind; this in turn, forms waves
ocean and atmosphere transfer energy back and forth
Answer:
The first one
Explanation:
waves are created by friction between wind and water surface
Answer: i think is the first one i don’t rembember
Explanation: trust me
3. What do you think is the primary reason why the Unionid mussel population declined whenever there is a dramatic increase in the Zebra mussel population?
When the Zebra arrived they ate all the food in the area leaving Unionid numbers to decline and die as they have no food to eat.
(NH4)2SO4(s) + 2NaOH(aq) → Na2SO4(aq) + 2NH3(g) + 2H200)
What mass of sodium hydroxide is required to react
completely with 15.4 g of (NH4)2SO4?
Answer:
9.36 grams NaOH needed
Explanation:
Given Rxn
(NH₄)₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2NH₃(g) + 2H₂O shows a molar reaction ratio of 1-mole (NH₄)₂SO₄ to 2-moles NaOH. If the 15.4 gram sample of (NH₄)₂SO₄ is converted to moles, then 2 times moles of ammonium sulfate will be the molar amount of NaOH needed to completely react. Complete computation by converting moles to grams NaOH; that is, multiply by formula wt. of NaOH (=40g/mol).
moles (NH₄)₂SO₄ = 15.4g/132.14g·mol⁻¹ = 0.117 mole (NH₄)₂SO₄.
moles NaOH = 2 x 0.117-mole = 0.234-mole NaOH needed.
∴grams NaOH needed = 0.234-mole NaOH x 40-g NaOH/mole NaOH = 9.36 grams NaOH needed. (3 sig. figs.)
Then multiply 0.117 mole by 2 => 0.234 mole NaOH needed to completely react with the 0.117 mole (NH₄)₂SO₄. Converting to mole to grams, multiply by formula wt. of NaOH => 0.117 mole x 40g/mole = 9.36 grams NaOH needed.
Which of the following is NOT an example of a chemical reaction?
A loaf of bread is sliced with a knife
A loaf of bread is baked in an oven
A loaf of bread is digested in the stomach
A loaf of bread molds in a pantry
Answer: D
Explanation:
because mold is a chemical reaction with with the air that's why the put a date cause the bread can only last for so long in till the chemical reaction.But D is is right because your body has to go though a chemical reaction in or to digest it and and break it down even more.So D would be the right answer cause that's where most of your chemical reaction happens when food is swallowed into the stoamch i hope i was able to explain it as much as i can
NEED HELP ASAP GIVING 20 POINTS AND BRAINLIEST
Given 18.5 grams of CHA and 24.0 grams of Oz the following reaction occurs. Calculate the number of grams of
carbon dioxide that form from the reaction.
CH4 + 20 + CO2 + 2 H2O
Answer:
CO2 should be 50.88 g
Explanation:
CH4 + 2 O2 --> CO2 + 2 H2O
First, find the moles of CH4:
Molar Mass of CH4 (formular mass):
12+1*4=16 g/mol (actually just use the atomic mass in your periodic table to add them up)
Then we can find how many moles in CH4 = 18.5÷16=1.15625 mol
As we know 1 mole of methane(CH4) makes 1 mole of CO2, so if 1.15625 moles of methane is reacted, 1.15625 moles of CO2 will be made.
So the moles of CO2 is 1.15625 moles.
Calculate the mass of CO2:
Molecular mass: 12+16*2=44 g/mol
Mass=44*1.15625=50.88 g (cor. to 2 d.p.)
Question 14 (1 point)
A magnesium atom has 11 neutrons. What is the mass of this magnesium atom?
Answer:
Mass=23
Explanation:
Mass= Protons + neutrons
Atomic number is the number of protons in magnesium.
Atomic number =12...So there are 12 protons
12p + 11n = 23
6HCl(aq) + 2A1)
-
3H2(g) + 2AlCl3(aq)
1. How many moles of hydrogen are produced from 1.20 moles of aluminum?
Answer: 1.80 moles of [tex]H_2[/tex] will be produced 1.20 moles of aluminium.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
The balanced chemical reaction is:
[tex]6HCl(aq)+2Al(s)\rightarrow 3H_2(g)+2AlCl_3(aq)[/tex]
According to stoichiometry :
2 moles of [tex]Al[/tex] produce = 3 moles of [tex]H_2[/tex]
Thus 1.20 moles of [tex]Al[/tex] will produce=[tex]\frac{3}{2}\times 1.20=1.80moles[/tex] of [tex]H_2[/tex]
Thus 1.80 moles of [tex]H_2[/tex] will be produced 1.20 moles of aluminium.
A gas occupies a volume of 85.0 liters at a pressure of 2.24 atm and a temperature of 22.5 degrees celsius. How many moles of gas are in the container?
Answer:
n = 7.86 mol
Explanation:
This question can be solved using the ideal gas law of PV = nRT.
Temperature must be in K, so we will convert 22.5C to 295 K ( Kelvin = C + 273).
R is the ideal gas constant of 0.0821.
(2.24atm)(85.0L) = n(0.0821)(295K)
Isolate n to get:
n = (2.24atm)(85.0L)/(0.0821)(295K)
n = 7.86 mol
3 poi
27) Name the neutral element with this Noble Gas shorthand
configuration.
Carbon C , reacts with excess sulfur dioxide , SO2 , to produce carbon disulfide, CS2 , and carbon dioxide, CO2 according to the following equation .
3C(s) + 2SO2(g) ⇉ CS2(I) + 2CO2(g)
How many grams of CS2 are produced when 6.00 moles of C reacts completely with excess amount of SO2 gas ?
Answer:
sorry sorry sorry sorry
Which is an example of balanced forces?
A.a door starting to open
B.a basketball being held
C.a truck beginning to accelerate
D.a book falling off a table
Answer: B. a ball being held
Explanation: while your holding the ball the potential energy is greater than the kinetic
where do cells get the instructions on how to build proteins ? help
Answer:
Inside the DNA molecules
Answer:
Genes give instructions to proteins; protein structure determines traits.
Explanation:
This graph shows how the potential energy of a reaction system changes
over time. Which statement is true for this system
A. The potential energy of the reactants is greater than the potential
energy of the products.
B. The height of the curve at point A represents the activation energy.
C. The height of the curve at point B represents the activation energy.
D. The potential energy of the products is greater than the potential
energy of the reactants.
Answer:
Answer is C since activation energy is needed in a reaction
Potential energy is the energy present in the reactions. The potential energy of the reactant in the graph is more than that of the product. Thus, option A is accurate.
What is potential energy?Potential energy is the energy of the reaction that results in the formation of products. The potential energy is reduced in the exothermic reactions as energy is released along with the products.
The bonds present in the reactants in the reaction mixture split in the presence of the activation energy to release energy and form the product.
Therefore, option A. the graph shows the greater potential energy of the reactant.
Learn more about potential energy here:
https://brainly.com/question/2292813
#SPJ2
A geologist visits Jessica’s classroom. He shows the class a diagram of different landforms. Which of the landforms is created by earth materials being deposited?
A. Cave
B. River delta
C. Canyon
D. Mountain
- What is the concentration of hydrogen ions if the pH is 12?
Answer:
There are
1.479
×
10
−
13
concentration of hydrogen ions
m
o
l
L
.
Explanation:
Because pH is a logarthmic scale, we can use the formula:
[
H
+
]
=
10
-pH
. Where...
=>
[
H
+
]
is the concentration of hydrogen ions in the solution.
=>
p
H
is the pH of the solution.
=> Where
10
is the base of the power - it's a logarithm formula.
We can now just sub in the values and solve for [
H
+
]
.
[
H
+
]
=
10
-pH
=
10
−
(
12.83
)
=
1.479108388
×
10
−
13
We can round (if required) to
1.479
×
10
−
13
.
Thus, there are
1.479
×
10
−
13
concentration of hydrogen ions
m
o
l
L
.
Hope this helps :)
. Which of these choices would help explain why the Zebra mussel population was 0 in 1991, while the population of native Unionid mussels was over 3000 organisms per square meter?
a
The scientists had a hard time spotting the mussels that year.
b
The climate was too cold for the Zebra mussels to reproduce that year.
c
The Zebra mussels had not yet been introduced to the area.
d
The water was moving too fast for the Zebra mussels to survive that year.
2. Over the 18 years of data depicted here, which mussel species was generally more successful?
Unionid Mussels
Zebra Mussels
Answer:
C. The Zebra Mussels had not yet been introduced to the area.
2.
Unionid Mussels they had a headstart in 1990
Doug used a magnet to move a .025kg ball. The magnet exerts a force of 5N, which causes the ball to begin moving. What is the acceleration of the ball when it begins to move?
Answer:
[tex]a=200\ m/s^2[/tex]
Explanation:
Given that,
The mass of a ball, m = 0.025kg
The force exerted by the magnet, F = 5 N
We need to find the acceleration of the ball when it begins to move. Let a be the acceleration. The net force of the ball is given by :
F = ma
Where
a is acceleration of the ball
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{5}{0.025}\\\\a=200\ m/s^2[/tex]
so, the required acceleration of the ball is [tex]200\ m/s^2[/tex].
The relationship between kinetic energy and speed is
Answer:
The energy transferred is known as kinetic energy, and it depends on the mass and speed achieved.
This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed.
KE = 0.5 • m • v2
where m = mass of object
v = speed of object
That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four. For a threefold increase in speed, the kinetic energy will increase by a factor of nine.
*
What does the temperature measure?
A)Total Kinetic Energy of Matter
b) Average Potential Energy of Matter
C) Average Kinetic Energy of Matter
D)Total Potential Energy of Matter
Answer:
it would be C average kinetic energy
please hurry
You discover a substance that is made of 10.6 g of Carbon and 4.4 g of Hydrogen.
(Use this to calculate empirical formula.)
The molar (molecular mass) of the compound is 68.204 g/mol.
(Use this when solving for molecular formula.)
What is the percent composition of this substance? (Make sure you percent has two (2) decimal places.)
What is the empirical formula of your substance? (Do not worry about making the numbers subscript).
What is the molecular formula of your substance? (Do not worry about making the numbers subscript).
please explain your answers
Explanation:
Elements contained. C. H
% by mass. 10.6. 4.4
/ each by its a.m. 10.6/12.0. 4.4/1.0
amount. 0.88. 4.4
/ each by the smaller. 0.88/0.88. 4.4/0.88
ratio of amount. 1.00. 5.00
simplest whole number ratio= 1 : 5
The empirical formula=CH5
What is created when a wire moves between the poles of a magnet?
A. An electric current
B. A solenoid
C. An electromagnet
D. A ferromagnet
Answer:
An electric current is created
An electric current is created when a wire moves between the poles of a magnet.
So, option A is correct.
What is Electric current?The movement of positive or negative electric particles such as electrons through electric conductor or space is called electric current.Types of electric current are direct current (DC) and alternative current (AC)The SI unit of electric current is Ampere.The poles of a magnet creates magnetic field through such effect the movement of electrons in the wire starts and creates electric current.What is direct current (DC) ?The current which glows in only one direction consistently is called direct current.The current that flows in a flashlight or another appliances which run through a battery is an example of direct current.What is alternative current (AC)?A type of electric current in which the direction of the flow of electrons switches back and forth at regular interval or cycles.Current flows in power line is an example of alternative current.learn about electric current,
https://brainly.com/question/2264542
#SPJ2
An object moves from one location to another that has a different gravitational pull. How would the object's mass be affected?
Which is NOT a component of the kinetic theory of matter?
Answer:
1) all matter is made up of atoms and molecules 2) these tiny particles are always in motion; the higher the temp. the faster they move 3) at the same temp., heavier particles move more slowly then small particles
Explanation:
What is the formula for the stable binary ionic compound formed between Barium and Oxygen?
A BaO
B. Ba2O2
CBaO2
D. Ba2O
Answer: a. BaO
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here element barium is having an oxidation state of +2 called as [tex]Ba^{2+}[/tex] cation and [tex]O^{2-}[/tex] is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]BaO[/tex]