Answer:
mass = kg
volume = cubic meters
time = seconds
length = meters
temperature = degrees Celsius
Explanation:
Sofia is trying to find the density of a 25.0 g irregularly shaped solid. She filled a graduated cylinder with 25.0 mL of water. After adding the solid the water rises to 56.5 mL. What is the density of the solid? Does this solid float or sink in water
Answer: Density: 0.794 g/ml. It would float.
Explanation: The mass of 25.0 grams displaces (56.5 - 25.0) = 31.5 ml of water, it's volume (when submerged). Density is mass per unit volume:
25.0 grams/31.5 ml = 0.794 g/ml
Water's density is 1 g/ml, so this obect would float. (Don't ask me why it displaced 31.5 ml. It won't unless it is pushed down, then the volume of the finger needs to be determined and subtracted from the calculated volume.
is seawater an element, compound, or mixture?
mass= 22g
volume=2cm^3
what is the mass ?
Answer:
The mass is in the question: 22 grams. If you meant to ask "What is the density, density = 22g/2cm^3, or 11g/cm^3. or 11g/ml.
Explanation:
Which one is NOT the name of a measurement system? (1 Point) International System of Units Metric System Spanish System British System
Spanish System is not the name of a measurement system
WHAT IS MEASUREMENT SYSTEM?
Measurement system are standard systems that are made up of collection is of units of measurement and guiding rules. Measurement system relates numerical values to physical quantities. There are three major system of measurements in use, they are:The international system of units (S.I units)The metric systemThe British imperial systemHence, Spanish System is not one of the names of measurement of systems.
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16. Mass = 10g
SA
Start: 30ml
Final: 50ml
What is the Volume?
What is the Density?
Actual volume=Final Volume-initial volume
[tex]\\ \sf\longmapsto 50ml-30ml=20ml[/tex]
Now
[tex]\\ \sf\longmapsto Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \sf\longmapsto Density=\dfrac{10}{20}[/tex]
[tex]\\ \sf\longmapsto Density=2g/ml[/tex]
Someone plz help me ;-;
Answer:
the events of the story
Explanation:
hope this helps
ventilator should be kept in our room give reasons of science
Answer:
Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at bottom. Thus ventilators maintain conventional currents to keep the air fresh in the room.
Explanation:
advantages and disadvantages of chemical
Answer:
Advantages :they are used for seeing chemical reactions .
they are used for doing chemical experiment .
they are used for making affective medicines .
Disadvantages :they harms to our environment.
they can make side effects in our body by affective medicines made by chemicals.
while doing different unknown experiments they make explosions which can also harm to us.
Which element has a larger ionic radius than calcium (Ca)?
The Periodic Table
A. Magnesium (Mg)
B. Potassium (K)
O C. Sodium (Na)
O D. Gallium (a)
SUBMIT
Answer:
magnesium
Explanation:
Magnesium has lesser valens electron than Ca, therefore the force for Mg between the nucleus and outer orbit of electron is lesser. Also, the radius will increase
Answer:
Gallium
has a larger ionic radius than (ca).
What is true about protons within an atom?
Select all that apply.
O They are negatively charged.
O They are equal to the atomic mass.
O They are equal to the atomic number.
O They are positively charged.
Answer:
They are positively charged
Explanation:
Hope it will help you
Protons are the sub-atomic particles present within the nucleus of the atom. The protons determine the atomic number and carry a positive charge. Thus, options c and d are correct.
What are protons?Protons have been discovered as the smallest unit or particle of the atom. They are present in the nucleus of the atom situated in the middle along with the neutrons. The protons alone are the characteristics to determine the atomic number and property of the element in the periodic table.
The protons have also been discovered to have a positive charge (+1) on them that binds the atom and electron by the attractive forces. They are heavier than the other particles and are the determinant of the chemical element.
Therefore, options c and d. protons are equivalent to atomic numbers and carry a positive charge is correct.
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What would be the atomic mass of Nitrogen-14
Answer:
The atomic mass of nitrogen is
14.0067 uYou learn more from failure than from successAnswer:
14.007 amu
Explanation:
Nitrogen has atomic mass of 14.007 amu.
Can someone plz help me :(
Answer:
i Say B
Explanation:
because I don't know:)
Atomic Mass is the ___________ of the mass numbers of all the isotopes of an element.
Answer:
Number of proton + No of electron
Explanation:
Mark me brainlist
Answer:
No of neutron + no of protons
Explanation:
Since atomic mass is the sum total of the neutron and mass number then we can say that, neutron number plus proton number is the mass number of all isotopes.
1
A student is testing a solid material to determine whether it is a pure substance or a mixture.
Which absensation would MOST likely indicate that the material is a mixture!
Answer:
The material has crystals of two different colors.
the density of a substance is 1.63g/mL. what is the mass of 250 mL of the substance in grams?
Density of substance:- 1.63g/ml
Volume of substance:- 250 ml
_________________________________
To FindMass of the substance.
_________________________________
We know[tex] \bold{Density} = \frac{ \bold{mass}}{ \bold{volume} }[/tex]
[tex]1.63 = \frac{ \bold{mass}}{250} \\ \\ \therefore \: \bold{mass} = \bold{density \times volume} \\ \\ \bold{mass} = 1.63 \times 250 \\ \\ \bold{mass} = 407.5 \: g[/tex]
So the mass of the substance is 407.5 g
_______________________________
Hope This Helps YouAnswer:
The answer to this question is 407.5 g
Explanation
The density of the substance = 1.63 g/ml
The volum of the substance = 0.25 L
Mass of the substance = ? (Determined)
We know that
So, 0.25 L will be equal to 250 ml. ( Unit must be same)
Formula
Se, mass of the substance is 407.5 g
Which measurement has 2 significant figures? *
0.00601 m
O
0.00600 m
0.00066 m
0.006060 m
0.006006 m
Answer:
[tex]0.00066[/tex]
Explanation:
Any number is significant if;
» It is before the decimal point. i.e; 1.000 [1 is a significant figure] and all other values will be significant. Hence the value has 4 signigicant figures.
» It is non-zero value, and when it is after a decimal point. i.e; 0.1, 0.01, 0.0001 [1 is the significant figure]. Hence each value has one significant figures.
» It is after any non-zero value, that comes after a decimal place. i.e; 0.00100 [the last two zeros are significant]. Hence the value has three significant figures.
Summary :
• 1.00 » three significant figures. ( 1 only )
• 0.01 » one significant figure. ( 1 only )
• 0.010 » two significant figures. ( 1 and last zero )
• 0.01006 » four significant figures (1, last two zeros, and 6)
• 0.00066 » two significant figures ( 6 and 6 )
What do you think of when you hear the word science? How would you define it?
. Restate What is a physical change in terms
of particle arrangement?
Answer:
In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy
Explanation:
1. What is the Charlotte?
A. A train
B. A car
D. An airplane
C. A ship
Answer:
B is the Charlotte
Explanation:
it is Charlotte because it has 4 wheels
B
Answer:
B. a car is a charlotte
Explanation:
because it has four wheels
Some movements of air are caused by the temperature of the air. Which of the following is a TRUE statement?
A Warm air rises because its molecules are farther apart, making it less dense.
B. Cold air mixes with warm air because the densities of cold and warm air differ.
C. Cold air rises because its molecules are closer together, making it less dense.
D. Warm air pushes cold air aside because warm air is denser than cold air.
an arrow is moving at 35m/sand travels for 5 seconds.how far did the arrow travel?
Answer:
175 meters
Explanation:
As it's velocity is 35m/s
so,
by formula
35 *5
175 meters
trying to turn this in. Could use the help ASAP!❤️
1.) Which statement correctly describes the relationship between the volume of a gas and it’s temperature, in Kelvin, assuming pressure is held constant?
A.) The relationship is directly proportional; as temperature increases, volume decreases in the same way.
B.) The relationship is inversely proportional,
As temperature increases, volume decreases in the same way.
C.) The relationship is directly proportional, as temperature increases, volume increases in the same way.
D.) The relationship is inversely proportional, as temperature increases, volume increases in the same way.
2.) which statement explains the molecular changes that occur in an enclosed gas as the pressure increases and the temperature is held constant
A.) an increase in pressure causes particles to move farther apart, decreasing the volume
B.) an increase in pressure causes particles to move farther apart, increasing the volume
C.) an increase in pressure causes particles move closer together, decreasing the volume.
D.) an increase in pressure causes particles to move closer together, increasing the volume.
3.) The ideal gas law is represented by PV = nRT. as volume is held constant and the temperature increases, how would the pressure be expected to change
A.) it will remain constant.
B.) it would decrease.
C.) it would increase
D.) it would become zero
4.) when the pressure of gas decreases, which quantity will increase, assuming all other variables are held constant?
A.) R
B.) n
C.) T
D.) V
5.) two balloons hold two different gases. The gases are held at the same pressure, volume, and temperature. Which quality can difference between the two gases?
A.) The molar volume of each gas
B.) The mass of each gas.
C.) The gas constant of each gas.
D.) The number of moles of each gas
Answer:
1.) Which statement correctly describes the relationship between the volume of a gas and it’s temperature, in Kelvin, assuming pressure is held constant?
→ C.) The relationship is directly proportional, as temperature increases, volume increases in the same way.
2.) which statement explains the molecular changes that occur in an enclosed gas as the pressure increases and the temperature is held constant
→ A.) an increase in pressure causes particles to move farther apart, decreasing the volume
3.) The ideal gas law is represented by PV = nRT. as volume is held constant and the temperature increases, how would the pressure be expected to change
→ A.) it will remain constant.
4.) when the pressure of gas decreases, which quantity will increase, assuming all other variables are held constant?
→ B.) n
5.) two balloons hold two different gases. The gases are held at the same pressure, volume, and temperature. Which quality can difference between the two gases?
→ C.) The gas constant of each gas.
1) This statement correctly shows the relationship between the volume of a gas and it’s temperature, in Kelvin, assuming pressure is held constant; "The relationship is directly proportional, as temperature increases, volume increases in the same way."
2) The following statement succinctly shows the molecular changes that occur in an enclosed gas as the pressure increases and the temperature is held constant is; " an increase in pressure causes particles move closer together, decreasing the volume."
3) The pressure increases as temperature increases
4) The volume decreases as the pressure increases
5) The number of moles of each gas of each gas can be different.
From the statement of Charles law, the volume of a given mass of gas is directly proportional to its temperature at constant pressure. Therefore, for a given mass of gas, as temperature increases, the volume also increases at constant temperature.
From the statement of Boyle's law, the volume of a given mass of gas is inversely proportional to its volume at constant temperature. Hence as the pressure increases, the volume of a given mass of gas decreases.
The pressure of a given mass of gas is directly proportional to the temperature of a fixed mass of gas if other variables are held constant.
From Avogadro's law, the volume of a given mass of gas is directly proportional to the number of moles. From this law, the number of moles of each gas of each gas can be different.
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Please help!
A. Only Dispersion Forces
B. Only Dispersion Forces and dipole-dipole
C. Dispersion Forces, dipole-dipole and hydrogen bonds
Could you please explain how you can look at the Chemical Formula and determine what type of interactions the molecule can do in simple terminology?
Will mark brainliest
Answer:
a
Explanation:
7.5 x 10^3 mL=liters
Answer:
7.5 * (10^3) ml =
7.5 liters
Explanation:
why the two isotopes of bromine have the same chemical properties.
Answer:
Isotopes of bromine have same chemical properties because they have same number of electrons.
Isotopes have only different number of mass that does not affect it's chemical properties too much.
please help me with my question
C2H2OH is the answer
I am not sure but I think
elements of the same group have the same chemical properties why
Answer:
because they have the same number of valence electrons in their outer shells
Explanation:
The atoms of all group 1 elements have similar chemical properties and reactions because they all have one electron in their outer shell.
Which of the following is NOT a correct conversion factor?
1 cm = 0.01 m
1 km = 1000 m
1 cm = 100 m
1 dm = 0.1 m
Answer: 1 cm = 100m
Explanation: Centi- is the prefix used to designate 0.01 (one hundredth) of something. 1 cm means 0.01 m.
1 cm = 100 m is NOT a correct conversion factor. Option C is correct.
what are conversion factors?The conversion factors are the factors that re-use to convert some values from unit to unit of another value like from centimeter to meter from meter to kilometer from milligram to gram.
In one centimeter it is the suffix used to denote it is the one by hundred value of the on meter or which is equal t one meter so, 1cm = 0.01 meters as it is the 1/100 part f the one-meter distance.
Therefore, Option C is correct. 1 cm = 100 m is NOT a correct conversion factor.
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3. If you started with a sample of 600 radioactive nuclei, how many would
remain undecayed after three half-lives?
Answer:
[tex]\boxed {\boxed {\sf 75 \ radioactive \ nuclei}}[/tex]
Explanation:
Radioactive decay occurs in unstable atom nuclei. The ratio of protons to neutrons is off, causing the instability. The nuclei release particles and radiation to change into different atoms.
The half-life is the time it takes for half of the nuclei to decay. We don't know the half-life of the sample, but we know it undergoes 3 half-lives. Therefore, the number of radioactive nuclei halves every time the sample undergoes a half-life.
We can divide the number of nuclei in half 3 times to find the amount left after 3 half-lives.
1st half-life: 600/2 = 300 2nd half-life: 300/2 = 150 3rd half-life: 150/2= 75After 3 half-lives, 75 radioactive nuclei remain undecayed.
why do rocks tell scientists about the environment in which they formed?
Answer:
Because some have fossils from long ago and some have dirt or sand in them that has hardened into rock over the years if that makes since?
Explanation:
Like if it's sand it could have been a sand dune or desert but if its dirt it could been a grassland or forest?
