Answer:
B.
Explanation:
Which of the following best
explains why matter changes
from one phase to another?
A. Changes in color causes matter to change
phase.
B. Changes in size causes matter to change
phase.
C. Changes in energy causes matter to change
phase.
D. Changes in volume causes matter to change
phase.
Answer:
c changes in energy causes matter to change
how many grams is 1.25 moles of NaCl
Molar mass of NaCl:-
23+35.558.5g/molNow
Mass=Molar mass ×MolesMass=125(58.5)Mass=7312.5gUranium-235 has a half-life of 713 million years. Would uranium-235 or carbon-14 be more useful for dating a fossil from Precambrian time? please help im lost on this and its due tomorrow!
Uranium-235 which has a half-life of 713 million years will best suited in dating a fossil from Precambrian time.
What is a Fossil?Thi8s is defined as a trace of an animal or plant of a past geologic age that has been preserved in Earth's crust.
The Precambrian time occurred around 4.6 billions years ago and Uranium-235 which having a half-life of 713 million years means it's more useful when compared to carbon-14 which has a half life of 5,370 years.
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40 points please help me very easy!
Answer:
it is charles's law
Explanation:
volume does matter with pressure
HELP ME RIGHT NOW!!! 100 POINTS PLUS A BRAINLEST!
current experiment; cabbage water vinegar, and baking soda ; (to see pH levels)
Name 1 new related experiments that could be done next to further research
Explain why these experiments would be the ones to do next.
Answer:
Soap and tomato juice :)
Explanation:
Using different types of pH levels may affect the results, so that is why I think this would be a good experiment to do. :)
Have an amzing day!!
Please rate and mark brainliest!!!
Answer:
Using litmus paper
Explanation:
If an acid is applied, the paper will turn red [pH range : 0 < x < 7]If it's a neutral substance, the paper will not change color [like water] (pH = 7)If a base is applied, the paper will turn blue [pH range : 7 < x ≤ 14]The half-life of cobalt-60 is 5 years. How old is a sample of cobalt-60 if only one-eighth of the original sample is still cobalt-60?.
[tex]\tt \large{\boxed{\bold{Nt=No.(\frac{1}{2}) ^{\frac{T}{t1/2} } }}[/tex]
Nt/No = 1/8
T = duration of decay
t 1/2 = half-life
[tex]\tt \dfrac{1}{8}=\dfrac{1}{2}^\dfrac{T}{5}}\\\\(\dfrac{1}{2})^3=\dfrac{1}{2}^\dfrac{T}{5}}\\\\3=\dfrac{T}{5}\rightarrow T=15~years[/tex]
How may PARTICLES of oxygen ore requried to make 6.7 moles of Carbon Dioxide
Answer:
0.15 moles
Explanation:
6.7moles x 1 mole co2 over 44.01 g = 0.15 moles
Why is most space exploration
accomplished with spacecraft that do not have
crews on board?
Answer:
why is most space exploration accomplished with spacecraft that do not have crews on board? humans face many challenges in space. what is one advantage of using an orbiter to study objects in space? can be used for long periods of time.
How many moles of potassium sulfate would you need to prepare 1200 grams of 5.0% potassium sulfate (m/m) solution? Select one: a. 0.34 mols b. 60 mols c. 3.4 mols d. 174 mols
Answer:
The moles of potassium that you would need to prepare 1200 g of 5% potassium sulfate solution is 1.538 moles
found as plankton in both marine and
freshwater environments and have a
single simple eye on top of their heads
Answer:
Explanation:
Copepods. The single eye gave them the nickname of "cyclops"
Which gland of the endocrine system is located near the brain?
Answer:
The pituitary gland is located below the brain. :)
What happens to the temperature of a gas when it is compressed?.
NEED IT ASAP!PLEASE HURRY
Answer:
snow, or freezing rain?
Explanation:
because freezing rain can occur then, but snow is more common.
The balanced equation for the aerobic reaction is:
Zn + 2 HCl → ZnCl2 + H2
How much hydrogen gas is produced from 5 g of HCl?
Please show work and be detailed.
Answer:
1.85 g of hydrogen gas will form!
Explanation:
1. Write the balanced equation.
Zn
+
2HCl
→
ZnCl
2
+
H
2
2. Calculate the moles of
Zn
.
Moles of Zn
=
30.0
g Zn
×
1 mol Zn
65.38
g Zn
=
0.4589 mol Zn
3. Calculate the moles of
H
2
.
Moles of H
2
=
0.4589
mol Zn
×
2 mol H
2
1
mol Zn
=
0.9177 mol H
2
4. Calculate the mass of
H
2
.
Mass of H
2
=
0.9177
mol H
2
×
2.016 g H
2
1
mol H
2
=
1.85 g H
2
Why is innate immunity referred to as nonspecific?
because it provides a built-in mechanism of defense that does not require "training"
because it is a form of defense found in all animal species
because it is a form of defense that functions in all human body systems
because it provides defense against a wide range of pathogens
Answer:
c
Explanation:
The innate immune system is the body's first line of defense against germs entering the body. It responds in the same way to all germs and foreign substances, which is why it is sometimes referred to as the "nonspecific" immune system
Which type of fuel can only be used in certain geographic areas?
O A. Nuclear
O B. Biomass
O C. Coal
O D. Wind
Answer:
A) Nuculear
Explanation:
Nuclear powerplants are danguorous for the ecosystem and incase of an exsplosion nuclear is the hardest to recover from. Especially if you know the story about Chernobyl blow up. many animals began to grow diffrent mutations and evryone had to evacuate from having desieses and mutations.
Hoped this helped...
PLEASE HELP!!!! WILL MARK BRAINLIEST! A balloon is filled with 257.88 L of gas at STP. When the balloon is cooled to -20.5°C, and the pressure decreased to .40 atm, what will the volume of the balloon be?
Answer:
3.97 psi
Explanation:
The new pressure can be found by using the formula for Boyle's law which is
P1 V1 = P2 V2
Which of the following is the molecule with the highest number of covalent bonds?
1. O2
2. N2
3. NH3
4. CO2
Answer:
N2 and NH3 both have 3 so try one of those ones
What is the pH of a 4.5 x 10^-3M HI solution?
A) 0.1
B) 4.8
C) 3.2
D) 2.4
A Cu/Cu2+ concentration cell has a voltage of 0.21 V at 25 ∘C . The concentration of Cu2+ in the cathode is 1.6×10−3 molL−1 .
What is the concentration of Cu2+ in the anode?
For a Cu/Cu2+ concentration cell has a voltage of 0.21 V at 25 ∘C, the concentration is mathematically given as
c1=2.7*10^6.77m
What is the concentration of Cu2+ in the anode?Generally, the equation for the Chemical reaction is mathematically given as
Cu---->cu +2^e O
2e+Cu+2 ---->Cu R
Therefore
[tex]Ecell=\frac{0.0591}{n}log(c2/c1)\\\\0.25=\frac{0.0591}{2}log(1.6*10^{-3}/c1)[/tex]
c1=2.7*10^6.77m
In conclusion, the concentration is
c1=2.7*10^6.77m
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the number of cobalt atoms in 0.00103 mole of cobalt
Identify the products of this single-replacement reaction between sulfuric acid and aluminum. Then balance the equation. (2 points)
___H₂SO₄ + ___Al → ___ + ___
The products of this reaction between aluminum and sulfuric acid are two: hydrogen and aluminum sulfate.
What are the products in a reaction?This concept refers to the substances obtained at the end of the reaction.
What does it mean to balance an equation?It means to make sure there are the same molecules in the reactants and products.
What are the products in this reaction?Al + H2SO4 = Al2 (SO4)3 + H2 Al2 (SO4)3 = Aluminium sulfateH = HydrogenWhat is the balanced equation?2Al + 3H2SO4 = Al2 (SO4)3 + 3H2
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Which of the following could be a compound?
A
two atoms of oxygen bonded together
B
individual atoms of argon
C
hydrogen bonded to oxygen
D
a mixture of oxygen and nitrogen gases
Answer:
b. Individual atoms of argon
Explanation:
Hope this helps!
-Justin
3. Which of the following statements is true?
a. A lithium ion has a 1+charge because it gained
one electron.
b. A magnesium ion has a 2-charge because it
lost two electrons.
c. A sulfide ion has a 2-charge because it gained
two electrons.
d. A chloride ion has a 1+ charge because it gained
one electron.
e. An aluminum ion has a 3-charge because it lost
three electrons.
c. A sulfide ion has 2- charge because it gaines two electrons
thia statement is true.
If 40mL of 2.50M HCl neutralizes 500ml. of KOH, what is the molarity of the KOH?
The molarity of the 500 mL KOH solution needed to neutralize the 40 mL of 2.50 M HCl is 0.2 M
Balanced equationHCl + KOH —> KCl + H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 1
The mole ratio of the base, KOH (nB) = 1
How to determine the molarity of KOH Volume of acid, HCl (Va) = 40 mLMolarity of acid, HCl (Ma) = 2.5 MVolume of base, KOH (Vb) = 500 mL Molarity of base, KOH (Mb) =?MaVa / MbVb = nA / nB
(2.5 × 40) / (0.15 × Vb) = 1
100 / (Mb × 500) = 1
Cross multiply
Mb × 500 = 100
Divide both side by 500
Mb = 100 / 500
Mb = 0.2 M
Thus, the molarity of the KOH solution needed is 0.2 M
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Draw the structure of the organic product formed by heating succinic acid.
The product of heating succinic acid is succinic anhydride, which is a structure with four carbon atoms, four hydrogen atoms, and three oxygen atoms.
What happens if you heat succinic acid?If succinic acid is heated the initial reactant (succinic acid) releases water, which changes the identity of the substance as succinic acid becomes succinic anhydride.
How to draw the product of this reaction?Draw the formula of the product which is C4H4O3.Using the formula draw the structure.Learn more about chemical reactions in: https://brainly.com/question/22817140
Please help me for this
Answer:
it says tick the box next to the correct answer so it'd be right to tick the last box:
The particles of the gas slow down
How to find moles of a cooking recipe? Chemistry project help please
The moles of substances required to make scrambled eggs is given in the cooking recipe for scrambled eggs.
What is the moles of a substance?A mole of. a substance is the amount of that substance which contains the avogadro number (6.02 × 10^23) of particles in it.
A mole of a substance is usually given as a standard unit measurement of that substance.
The mass of 1 mole of is known as the molar mass if that substance.
From the recipe for preparing scramble eggs given, the moles of substances required are as follows:
6 moles of eggs1 mole of red bell pepper1 mole of green bell pepper1/2 moles of carrots1/4 moles of olive oil 1/4 cup of saltTherefore, the moles of substances required to make scrambled eggs is given in the cooking recipe for scrambled eggs.
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WE DO: The mechanism shown here is proposed for the reaction:
2A → 2B + C
2A k1↔ B + D (Fast, equilibrium)
B + D k-1→ E + C (Slow)
E → 2B (Fast)
Propose a rate law consistent with the mechanism.
Please show and explain everything.
Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is [tex]B+D \rightarrow ^{k_{-1}} E+C[/tex].
What is the rate law?Rate law can be defined as a chemical equation that is used to relate the initial (forward) chemical reaction rate with respect to the concentrations of both the chemical reactants and constant parameters.
Mathematically, the rate law is given by this formula:
[tex]R = K[A]^x[B]^y[C]^z[/tex]
Where:
k is the rate constant.A is the concentration of reactant A.B is the concentration of reactant B.C is the concentration of reactant C.x, y, and z are the order of the reaction.Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is as follows:
[tex]B+D \rightarrow ^{k_{-1}} E+C[/tex]
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The second-order rate constant for the decomposition of NO2 (to NO and O2) at 573 K is 0.54 M-1 s-1. Calculate the time for an initial NO2 concentration of 0.20 mol/L to decrease to a) one-half; b) one-sixteenth; c) one-ninth of its initial concentration.
The rate of second order reaction depends on the change in the concentration of the reactants.
Second order reaction:A second order reaction is one in which the rate of reaction depends on the concentration of reactants.
For a second order reaction;
1/[A] = kt + 1/[A]o
When concentration deceresases to one-half;
1/0.1 = 0.54t + 1/0.20
1/0.1 - 1/0.20 = 0.54t
10 - 5/0.54 = t
t = 9.3 s
When concentration deceresases to one-sixteenth;
1/0.0125 = 0.54t + 1/0.20
1/0.0125 - 1/0.20 = 0.54t
80 - 5 = 0.54t
t = 80 - 5/0.54
t = 149 s
When concentration deceresases to one-ninth;
1/0.022 = 0.54t + 1/0.20
1/0.022 - 1/0.20 = 0.54t
45 - 5 = 0.54t
t = 45 - 5/0.54
t = 74 s
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