Answers
Related Questions
Which of these is the smallest?
cells
atoms
molecules
cell membranes
Science 7th grade
Answers
Answer: atoms
Explanation: cell membrane is in a cell
a pan of boiling water on the stove is
conduction
convection
radiation
Answers
An aerosol can contains gas under a pressure of 2.0 atm at 20°C. Directions on
the can say that the can should be kept at less than 65°C. What would the
pressure in the can be at 65 °C?
Answers
Answer:
Explanation:
The volume is the same in both cases so the formula is
P1/T1 = P2/T2
T1 = 20 + 273 = 293 You have to convert Celcius to degrees Kelvin.
T2 = 65 + 273 = 338 degrees Kelvin
P1 = 2.0 atmospheres.
2.0 / 293 = P2/ 338
2*338 / 293 = P2
P2 = 676 / 293
P2 = 2.31 atmospheres
The density of aluminum is 2.7 g/cm3. A metal sample has a mass of 52.0 grams and a volume of 17.1 cubic centimeters. Could the sample be aluminum? EXPLAIN your answer.
Answers
Answer:
The given metal sample is not aluminum because its density is 3.0 g/cm³ while density of aluminum is 2.7 g/cm³.
Explanation:
Given data:
Density of aluminum = 2.7 g/cm³
Mass of metal sample = 52.0 g
Volume of metal sample = 17.1 cm³
which sample is that = ?
Solution:
The given problem will be solve through density formula.
d = m/v
d = density
m = mass
v= volume
Now we will put the values in formula.
d = 52.0 g/ 17.1 cm³
d = 3.0 g/cm³
It is given in question the density of aluminum is 2.7 g/cm³. The given metal sample is not aluminum because its density is 3.0 g/cm³.
A student needs 1.52 moles of sodium hydroxide (NaOH). How many grams of sodium hydroxide are required? (1 mole NaOH = 40.00 grams NaOH) *
60.8 grams NaOH
1.00 grams NaOH
62.7 grams NaOH
0.038 grams NaOH
Answers
Answer:
1 molecule = 40.00 grams
1.52 molecules = 1.52*40.00
= 60.8 grams
A ______________________ is required to cause atoms to bond together or be separated from one another. *
a physical change
b phase change
c radioactive decay
d chemical reaction
Answers
Answer:
d chemical reaction..
what does the o in chemistry mean?
Answers
look at the periodic table and it says it
Answer:
oxygen
Explanation:
periodic table
Why does water vapor
condense at higher
elevations?
A. cooling causes condensation
B. faster particle activity
C. due to a chemical change
D. due to a chemical reaction
Answers
Answer:
A. cooling causes condensation
Explanation:
air is cooler at higher altitude in the troposphere.
what are the two main phases of cell division
Answers
Answer:
Mitosis meiosis
Explain:
Mitosis is where the cell splits into 2 more cells (diploid)
Meiosis is where the cell splits into 2, and then split again, making 4 (haploid)
Question 3 (12 points)
The core becomes a
a hot, dense, slowly cooling sphere of carbon.
Оа
red dwarf
Answers
Answer:
c
Explanation:
If 65,000 J of energy were transferred to 450 g of water at 20˚C. What would have been the final temperature of the water?
Answers
Answer:
500g
Explanation:
Answer:Suppose that during the Icy Hot lab that 65 KJ of energy were transfered to 450 g of water at 20 degrees C. What would have been the final temerpatur
Explanation:
The world map below shows the locations of San Francisco and Dublin which of these statements best explains why Dublin is not cooler than San Francisco although it is over 1600 km further north?
Answers
Answer:
Dublin is warmed by ocean currents.
Explanation:
Got it right on test
Answer:
B. Dublin is warmed by ocean currents.
Explanation:
Draw the Lewis structure for CF3PCF2 where all fluorines are bonded to a C atom
Answers
Answer:
See attached picture.
Explanation:
Hello.
As you can see on the attached picture, this Lewis structure requires all the elements to attain eight electrons after bonding, that is why the phosphorous is bonded with the two carbon atoms via a single bond with the carbon having the three fluorine atoms and a double bond with the carbon having the two carbon atoms.
Such arrangement is due to the fact that:
- P gets eight electrons by obtaining three from the two sided carbon atoms.
- The first carbon gets eight electrons from its initial four, three provided by each surrounding fluorine and one from the central phosphorous.
- Each fluorine gets eight valence electrons from their initial seven and one from the available carbon atoms.
Best regards.
why is earth often referd as a blue planet ?
A-When viewed from space, the biosphere always looks blue.
B-Most people like blue.
C-The sky is blue.
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
NEED ANSWER ASAP
Answers
Answer:
D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.
Explanation:
Q1. Why is Cl2 a nonpolar molecule, but HCl is a polar molecule? Explain your reasoning.
Answers
Answer:
\/\/
Explanation:
in CI2 the electron charge is identical on both atoms but on HCI electrons are shared unequally between the chlorine atoms and hydrogen atoms
Help me out i don’t not understand this
Answers
Explanation:
hope this helps!!! happy learning!!!!
One isotope of Carbon(C) has exactly the same mass number and atomic mass since it was used as the definition of the atomic mass unit. Which isotope is it and what is it’s atomic mass?
Answers
hope this helps have a great day !
as young adult how can you contribute in the situation on our country while we are facing the pendemic
Answers
Answer: You can give canned food to the poor or try helping people by donating money.
Explanation:
When you give canned food or packets of water the people who haven't eaten in ages or drank clean water can maybe help boost imunity.
When you give money you can help people buy things they need to survive this pandemic.
Answer:
Keep a positive attitude
Explanation:
Dont worry about thinks that put you down and try to think about something that helps keep up your spirits. For example, thinks that you are proud of.
Try to think a little less of things like this, ¨Great, now we have a pandemic, now the world is going to end¨ but to thy think more of ¨Hey, this is a time where people need help the most, lets do our best to help them. I believe I can make the world a better place because I have the power of postivity.¨
Put a smile n your face, stand up and say ¨today can be a great day!!¨
What do you notice about the relationship between the force strength and the size of the velocity change?
Answers
Answer:
fkv SFHHHHHHHHHCB FSSSSZCHJjjjb .SFFHHHHHHHHC
Explanation:
What do you notice about the relationship between the force strength and the size of the velocity change?
Uuuuuuu
what are the two components present in the colloid
Answers
Answer:
the two components in colloid are dispersed phase and dispersing medium
I hope this helps
You add 168.90 grams of NaCl to a container and then you add 616.00 grams of water to that same container What is the weight percent of NaCl in the containerI
Answers
Answer:
The weight percent of NaCl in the container is 21.5%
Explanation:
Given that,
Mass of NaCl = 168.90 gram
Mass of water = 616.00 grams
We need to calculate the weight percent of NaCl in the container
Using formula of percentage of weight
[tex]weight\ \%\ of\ component\ of\ the\ solution =\dfrac{weight\ of\ the\ component\ in\ the\ solution}{total\ weight\ of\ the\ solution}\times100[/tex]
Put the value into the formula
[tex]weight\ \%\ of\ component\ of\ the\ solution =\dfrac{168.90}{168.90+616.00}\times100[/tex]
[tex]weight\ \%\ of\ component\ of\ the\ solution=21.5\%[/tex]
Hence, The weight percent of NaCl in the container is 21.5%
Help pls 100 points and brainiest
Answers
Answer:
See below
Explanation:
INdependent = amount of med given
Dependent = recovery time <==== this 'depends' on the amount of medicine given
Test (Speed, Velocity and Acceleration)
A dog can run as fast as 15 miles per hour for a short distance. If a dog ran at this speed 0.10 of an hour, how far would it run?
Answers
Answer:
1.5 miles
Explanation:
Given that,
Speed of dog, v = 15 mph
Time taken by the dog, t = 0.1 h
We need to find the distance travelled by the dog. We know that, distance is the product of speed and time. So,
d=vt
[tex]d=15\times 0.1\\\\d=1.5\ \text{miles}[/tex]
Hence, the dog will cover a distance of 1.5 miles.
How many days are in 5.75 weeks?
Answers
Answer:
There are 40.25 days in 5.75 weeks
Answer: 40.25
Hope this helped! :)
PLEASE HELP ME
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question.
Check all that apply.
H2(g)+12O2(g)→H2O(g)
Li(s)+12F2(g)→LiF(s)
2Li(s)+F2(g)→2LiF(s)
Li(s)+12F2(l)→LiF(s)
2H2(g)+O2(g)→2H2O(g)
H2O2(g)→12O2(g)+H2O(g)
Answers
Answer:
Explanation:
Li(s)+1/2 F₂(g)→LiF(s)
In this reaction one mole of product is formed from gaseous state of reactants . So this reaction will represent the reaction for which ΔH∘rxn equals to ΔH∘f .
In other reaction one mole is not produced if we balance the reaction. The reactant must be in gaseous state . ΔH∘f . represents heat of formation . ΔH∘rxn represents heat of reaction .
Help me please answer this with solution....A piece of granite weighing 250g is heated in a boiling water to 100°C. When a granite is place in a calorimeter containing 400g water, the temperature of the water increases from 20°C to 28.5°C. What is the specific heat of the granite, assuming all the heat is transferred to the water?
Answers
heat lost by granite + heat gained by H2O = 0
[mass granite x specific heat granit x (Tfinal-Tinitial)] + [mass H2O x specific heat H2O x (Tfinal-Tinitial)] = 0
Substitute and solve for specific heat granite, the only unknown.
The specific heat capacity of the granite is 0.796 J/gºC
We'll begin by calculating the heat absorbed by the water. This can be obtained as follow:
Mass of water (M) = 400 g
Initial temperature of water (T₁) = 20 °C
Final temperature (T₂) = 28.5 °C
Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 20 = 8.5 °C
Specific heat capacity of water (C) = 4.184 J/gºC
Heat absorbed (Q) =?Q = MCΔT
Q = 400 × 4.184 × 8.5
Q = 14225.6 JThus, the heat absorbed by the water is 14225.6 J
Finally, we shall determine the specific heat capacity of the graniteHeat absorbed = Heat released
Heat absorbed = 14225.6 J
Heat released = –14225.6 JMass of granite (M) = 250 g
Initial temperature of granite (T₁) = 100 °C
Final temperature (T₂) = 28.5 °C
Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 100 = –71.5 °C
Specific heat capacity of granite (C) =?Q = MCΔT
–14225.6 = 250 × C × –71.5
–14225.6 = –17875 × C
Divide both side by –17875
C = –14225.6 / –17875
C = 0.796 J/gºCTherefore, the specific heat capacity of the granite is 0.796 J/gºC
Learn more: https://brainly.com/question/21218237
In the warm up, you reviewed the equation to calculate
kinetic energy. What question could you ask about kinetic
energy which will include the variables that affect it?
Answers
Answer:
Can be used to do work,and it can be converted to potential.
Explanation:
Answer: can it be used to do work
Explanation:
Which of the four models represents a solid
Answers
Answer:
is there an image
Explanation:
What is the molar mass of Mg(ClO4)2?
Answers
Answer:
223.21 g /mol
Explanation:
To find the molar mass (g/mol) of a substance, you have to add the amu's of all the elements together. First you have to determine how of element there are:
Mg=1, Cl=2, O=8. Now you multiply the amu of each element by the number of elements in the compound. Then add them together. The amu of an element and its molar mass are the same.
1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol) = 223.31 g/mol
223.31 g/mol is the molar mass of the given compound. The molar mass of a material is a bulk attribute rather than a molecular one.
The ratio among the mass with the quantity of a substance (measured in mole) of any sample of a chemical compound is known as the molar mass (M) in chemistry. The compound's molar mass represents an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average as well as a function of the relative distribution of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.
Molar mass=1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol)
= 223.31 g/mol
To know more about molar mass, here:
brainly.com/question/12127540
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What is the concentration of a dextrose solution prepared by diluting 15 mL of a 1.0 M dextrose solution to 25 mL using a 25 mL volumetric flask
Answers
Answer:
C₂ = 0.60 M
Explanation:
Step 1: Given data
Concentration of the concentrated solution (C₁): 1.0 MVolume of the concentrated solution (V₁): 15 mLConcentration of the diluted solution (C₂): ?Volume of the diluted solution (V₂): 25 mLStep 2: Calculate the concentration of the diluted dextrose solution
We will use the dilution rule.
C₁ × V₁ = C₂ × V₂
C₂ = C₁ × V₁ / V₂
C₂ = 1.0 M × 15 mL / 25 mL
C₂ = 0.60 M
