Answer:
b refraction
Explanation:
i saw on nasa's website lol
Students measuring the mass of a metal block record 2.985 g, 3.051 g, 3.102
g, and 3.211 g. Which other measurement of the block's mass would be most
precise?
A. 2.804 g
B. 3.1159
C. 3.418 g
D. 3.509 g
Answer:C - 3.115 g
Explanation:Correct
The combination of all the organ systems working together make up a(n) _______________________.
1.organ system
2.organism
3.organ
4.cell
Answer:
2
Explanation:
Explain how the forces involved in a car crash could lead to multiple cars coming to a complete stop. Use information from the article in order to answer this question. You should be answering in at least 2 complete sentences.
Answer:
Newton's First Law...
Explanation:
The only force that acts on the car is the sudden deceleration from v to 0 velocity in a brief period of time, due to the collision with another object. However, when viewing the total system, the collision in the situation with two cars releases twice as much energy as the collision with a wall
can someone please help me i don't know these question bc my family celebrates thanksgiving differently. plz and thank you :3
Easy: How many turkeys are consumed on Thanksgiving day in America?
Medium: How long did the first Thanksgiving Celebration last?
Hard: When was the first NFL football game on Thanksgiving?
Fun: Who was the first president to pardon a turkey?
Answer:
Easy 46 million turkeys
Medium three days
Hard: 1934
Fun: The first President on record issuing a "pardon" to his turkey was Ronald Reagan.
Explanation:
hop tis helped
Strontium-90 is one of the products of the fission of uranium-235. This strontium isotope is radioactive, with a half-life of 28.1 yr. Calculate how long it will take for 0.900 g of the isotope to be reduced to 0.170 g by decay.
Answer:
67.6 years is the time the isotope take to decay from 0.900g to 0.170g
Explanation:
The radioactive decay follows first order law:
Ln [A] = -kt + ln[A]₀
Where [A] is concentration after time t,
k is decay constant:
k = ln 2 / t(1/2)
k = ln2 / 28.1 years
k = 0.02467 years⁻¹
[A]₀ = Initial concentration.
We can replace concentration and use the mass of the isotope:
Ln [A] = -kt + ln[A]₀
Ln [0.170g] = -0.02467 years⁻¹t + ln[0.900g]
-1.667 = -0.02467 years⁻¹t
t =
67.6 years is the time the isotope take to decay from 0.900g to 0.170gThe time required for the sample to reduce to 0.170 grams has been 67.75 years.
Half-life can be defined as the times required by the substance to reduce to half of its initial concentration.
The half-life can be expressed as:
Amount left = Initial amount [tex]\times[/tex] [tex]\rm \dfrac{1}{2}^\dfrac{time}{Half-life}[/tex]
From the given:
0.17 g = 0.9 [tex]\rm \times\;\dfrac{1}{2}^\dfrac{t}{28.1}[/tex]
[tex]\rm \dfrac{0.17}{0.9}[/tex] = [tex]\rm \dfrac{1}{2}^\dfrac{t}{28.1}[/tex]
0.188 = [tex]\rm (0.5)^\dfrac{t}{28.1}[/tex]
Taking log on both the sides,
log 0.188 = [tex]\rm \dfrac{t}{28.1}\;\times[/tex] log 0.5
2.411 = [tex]\rm\dfrac{t}{28.1}[/tex]
t = 2.411 [tex]\times[/tex] 28.1 years
Time = 67.75 years.
The time required for the sample to reduce to 0.170 grams has been 67.75 years.
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What is the independent variable when testing to see how the viscosity of a liquid affects its flow rate
Answer:
Viscosity
Explanation:
The viscosity of the liquid is the independent variable. The flow rate is the dependent variable in this hypothesis.
The statement given is called the hypothesis. It is a form of scientific guess into a phenomenon.
An independent variable is the cause. A dependent variable is the effect produced. In this hypothesis, the cause of the various flow rate of the liquid is the viscosity. It is therefore the independent variable. The flow rate is the dependent variable.Whats faster light or sound? PLEASE HELPY ME
Answer:
The answer is that light is faster than sound.
Explanation:
A good example is of lightning and thunder during a thunderstorm.
mark me brainliest!
Are cyclops heterotrophic or autotrophic?
Cyclops are heterotrophic
A 25.00 ml solution containing 0.033 M sodium acetate is titrated with a 0.098 M solution of HCl. How mar
milliliters of HCl are required to reach the endpoint?
Answer:
[tex]8.42\ \text{mL}[/tex]
Explanation:
When the endpoint is reached the millimoles of sodium acetate and HCl will be equal.
[tex]\text{Volume of sodium acetate}=25\ \text{mL}[/tex]
[tex]\text{Molarity of sodium acetate}=0.033M[/tex]
[tex]\text{Molarity of HCl}=0.098M[/tex]
[tex]\text{Millimoles of sodium acetate}=25\times 0.033=0.825\ \text{mmol}[/tex]
Let [tex]V=\text{Volume of HCl}[/tex]
[tex]\text{Millimoles of HCl}=0.098V[/tex]
At end point the millimoles will be equal to that of sodium acetate
[tex]0.825=0.098V\\\Rightarrow V=\dfrac{0.825}{0.098}\\\Rightarrow V=8.42\ \text{mL}[/tex]
The volume of HCl required is [tex]8.42\ \text{mL}[/tex].
The volume of HCl required to required to reach endpoint is 8.42 mL
From the question,
We are to determine the volume of HCl required to reach endpoint
First, we will write a balanced chemical equation for the reaction.
The balanced chemical equation for the reaction is
CH₃COONa + HCl → CH₃COOH + NaCl
This means
1 mole of sodium acetate is required to completely neutralize 1 mole of HCl
Now, we will determine the number of moles of sodium acetate present
Using the formula
Number of moles = Concentration × Volume
Concentration of sodium acetate = 0.033 M
Volume of sodium acetate = 25.00 mL = 0.025 L
∴ Number of moles of sodium acetate present = 0.033 × 0.025
Number of moles of sodium acetate present = 0.000825 mole
Now,
Since, 1 mole of sodium acetate is required to completely neutralize 1 mole of HCl
Then,
0.000825 mole of sodium acetate would be required to completely neutralize 0.000825 mole of HCl
∴ The number of moles of HCl needed is 0.000825 mole
Now, for the volume of 0.098 M HCl required to reach endpoint
Using the formula
[tex]Volume = \frac{Number\ of\ moles}{Concentration}[/tex]
∴ Volume of HCl required to required to reach endpoint = [tex]\frac{0.000825}{0.098}[/tex]
Volume of HCl required to required to reach endpoint = 0.008418367 L
Volume of HCl required to required to reach endpoint = 8.418367 mL
Volume of HCl required to required to reach endpoint ≅ 8.42 mL
Hence, the volume of HCl required to required to reach endpoint is 8.42 mL
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When the following equation is balanced, the coefficients are __________. Al(NO3)3 + Na2S → Al2S3 + Na(NO3)
The balanced coefficients in the reaction are now; 2, 3, 1, 3.
A balanced chemical reaction equation is one in which the number of atoms of each element on the right hand side of the reaction equation is equal to the number of atoms of the same element on the left hand side of the reaction equation.
For the reaction show, the balanced reaction equation is; 2Al(NO3)3 + 3Na2S → Al2S3 +3 Na(NO3). The balanced coefficients in the reaction are now; 2, 3, 1, 3.
Learn more about reaction equations: https://brainly.com/question/15939621
This water bottle has a mass of 0.5 kg.
CU
If the net force acting on the bottle is 5 N to the right, what is the bottle's
acceleration?
(Hint: Use the formula a = =)
A. a = 10 m/s2 left
B. a = 50 m/s2 right
c. a = 10 m/s2 right
D. a = 2 m/s2 left
PLEASE ANSWER I WILL GIVE BRAINLYEST
Answer: the answer is a=10m/s^2 right
Explanation: it just make more since then the other answers .
Answer:
c 10
Explanation:
ape.x verified
What is the definition of a community in environmental science
Where is type of precipitation is most likely to form during a thunderstorm
Answer:
hail, btw have a nice day
Answer:
Hail
Explanation:
I got it right on my test
What happens when the atoms of a substance are regrouped
What is the independent variable based on the hypothesis below?
"If acid rain is in water, then fish populations will increase"
Answer:
Acid rain
Explanation:
The independent variable in the hypothesis statement is the acid rain. An independent variable is usually the cause in an experiment.
This variable give rises to the effects observed as the dependent variable.
In the presence of the acid rain, the fish population will increase.
The dependent variable is the fish population or number of fishes.
The independent variable is the acid rain as it is the cause of the effect observed on the fish population.
Marissa blows up balloons for a party. She decides how big or small to make each balloon. Why does the air she blows into each balloon take up all the space inside the balloon
Uranium-235 undergoes the following fission process after
absorbing a neutron:
235 U +in+Kr + 14 Ba + xon
What is the value of x?
x =
Your answer should be a number.
The value of x = 3
Further explanationFusion and fission reactions are reactions involving atomic nucleus reactions
Fission reaction is a nucleation division reaction by firing a particle usually neutron so that it gets smaller particles of atomic nuclei.
Fission of Uranium-235
[tex]\tt ^1_0n+^{235}_{92}U\rightarrow ^{141}_{56}Ba+^{92}_{36}Kr+3^1_0n[/tex]
In this reaction, the sum of the mass number and atomic number of the elements involved in the reaction will be equal
atomic number left : 0+92=92
atomic number right : 56+36=92
mass number left : 1+235=236
mass number right : 141+92+3=236
The value of x in the fission process of uranium has been 3.
Fission reaction has been the nuclear reaction resulting in the breaking of the element into smaller substituents. The fission of uranium has been:
n + U [tex]\rightarrow[/tex] Ba + Kr + n
In the given fission reaction, the mass number of the atoms on the right and left of the reaction has to be equal. The mass number has been;
235 + 1 = 141 + 92 + x
236 = 233 + x
x = 236 -233
x = 3
The value of x in the fission process of uranium has been 3.
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Which one will diffuse faster Ammonia or carbon dioxide Why?
jcp-fnoa-kzk join here
Identify ALL the possible mol ratio from
this balanced equation:
Answer:
[tex]\frac{1 mole of N_{2} }{3 moles of H_{2} }[/tex]
Explanation:
The equation of the reaction:
Nitrogen gas N₂ reacts with Hydrogen as H₂ to produce ammonia NH₃;
N₂ + H₂ → NH₃
The balanced equation is ;
N₂ + 3H₂ → 2NH₃
The mole ratio is the ratio of the coefficients of the combining reactants;
1 mole of N₂ combines with 3 mole of H₂;
So;
[tex]\frac{1 mole of N_{2} }{3 moles of H_{2} }[/tex]
What is the oxidation number of an element? PLz help. Will give brainliest to correct answer. explanation helpful but not required. Dont answer unless you know
Answer:
its eathe a or c a 50/50 chance
Answer:
Explanation:
its B
(please mark as brainliest if it's correct)
hi can someone help me with these 2 :)
Answer:
a and d
Explanation:
A neutral atom of gold has the same number of electrons and what?
Why do we dream? Help me Please;)
Answer:
Explanation:
we dream because when our bodies are taking memories into long term, the memories from that day or the day before collide and make dreams. that is why they resemble things that have happened to us.
Answer:
One widely held theory about the purpose of dreams is that they help you store important memories and things you've learned, get rid of unimportant memories, and sort through complicated thoughts and feelings. Research shows that sleep helps store memories.
The brain is so active when we dream that it is virtually indistinguishable from a brain in the waking state. Even so, the chemistry of it is entirely rewired when we sleep. Many scientists attribute this to the reason dreams are so strange and bizarre.
Explanation:
Question 2 (1 point) The chemical formula for an ionic compound represents the a b number of ions in each molecule. total number of ions in the crystal lattice. number of atoms in each molecule simplest ratio of ions that results in an electrically neutral compound.
The chemical formula for an ionic compound represents the simplest ratio of ions that results in an electrically neutral compound. That is option D.
What is an ionic chemical compound?An ionic chemical compound is defined as the type of chemical compound that contains both the oppositely-charged ions of a metal and a nonmetal are attracted reacting with each other to form an ionic bond.
When represented as a chemical formula, it is the simplest ratio of ions that results in an electrically neutral compound.
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Group 17 is called the halogen family, and the group to its right is called the noble gases. How are these elements alike and how are they different?
Explanation:
The halogen family and noble gases are similar in just one particular way, they are groups of non-metals. All members of these two groups are categorized as non-metals.
Here are some of the differences between them;
Halogens have 7 electrons in their outermost shell whereas noble gases have 8 electrons in theirs. Halogens are highly reactive elements, noble gases are non-reactive. Halogens are made up of electronegative elements where as noble gases are neither electropositive nor electronegative.Fill in the coefficients that will balance the following reaction:
(Note: Use 1 as coefficient where appropriate.)
CH4 +
O2 →
CO2 +
H2O
Answer:
CH4 + 2 O2 → CO2 + 2 H2O
Explanation:
There are one mole of O2 on the left side and on the right side there are three moles of O2. And to fix it you would need to make it two moles of O2 to have four molecules of O2 on the left side. Then you would make two moles of H2O to have a total of four moles of O2 on the right. Therefore, CH4 + 2 O2 → CO2 + 2 H2O is the answer.
Answer:
1,2,1,2
Explanation:
hope this helped!
ANSWER THIS TO BE MARKED BRAINILEST Water in a beaker measures 250 milliliters. A rock is completely submerged in the water. The water level now reads 375 milliliters. What is the volume of the rock in cubic centimeters? Explain your answer
Answer:
125 cubic meters
Explanation:
Subtract 375-250=125 cubic meters
it is sunny today is that whether or climate this isn't chemistry but...
Answer:
weather
Explanation:
Fill in the coefficients that will balance the following reaction:
(Note: Use 1 as coefficient where appropriate.)
_C3H7OH + _O2 → _CO2 + _H2O
What affects wind speed?
Answer:
At the Earth's surface, wind blows horizontally from high pressure to low pressure areas. The speed is determined by the rate of air pressure change, or gradient, between the two pressure areas. The greater the pressure difference, the faster the winds.
- sciencing
The Four Forces That Influence Wind Speed & Wind Direction
Explanation: