Answer:
density is the sum of the mass and volume of an object
what is combination reaction give two examples
I don't know what to do...
from my thinking. you should find a solid..then try finding its volume.
Balancing oxidation-reduction reactions
Mg+ N2—>Mg3N2
Answer:
[tex]{ \sf{3Mg_{(s)} + N_{2(g)} →Mg _{3}N_{2(s)}}}[/tex]
a radioactive element has a half-life of 30 days. calculate the mass of the element that remains after 20 days if 100g of the element decays. Also, calculate the decay constant.
Answer:
A=Ao(1/2)^t/h
A=(100)(1/2)^20/30
A=63g
the nucleus of an atom is positively charged why
Answer:
hello ~~
look nucleus is mixture of neutrons and protons.. right?
and we know neutrons have no charge and protons are positively charged so overall charge of nucleus is positive
How many kilojoules are required to raise the temperature of a 150. g sample of silver from 25 °C to 135 °C? Silver has a specific heat of 0.235 J/g °C.
Answer:
3.8775 kJ
Explanation:
The formula is Q=mcdeltat
We know m (mass) is 150, c (specific heat) is 0.235, and delta t (change in temperature) is 135-25=110
Plug that in and solve for Q
150*0.235*110=3877.5 J
The problem is that this is still in joules so we have to convert to kilojoules
3877.5 J * 1 kJ/1000 J = 3.8775 kJ
How is the atomic mass of an element determined?
A. by adding the masses of the protons and electrons
B. by adding the masses of the neutrons and electrons
C. by determining the number of protons
D. by adding the masses of the protons, neutrons, and electrons
Answer:
D
Explanation:
Atomic mass is the total mass of protons, neutrons and electrons of an atom at rest
Polar molecules have partial positive and partial negative charges. An electrical
attraction between the partial positive charge of one polar molecule and the partial
negative charge of another polar molecule is called a/an
Answer:
Image result for Polar molecules have partial positive and partial negative charges. An electrical attraction between the partial positive charge of one polar molecule and the partial negative charge of another polar molecule is called a/an
A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other.
Explanation:
Which element would most likely lose electrons to form positive ions when bonding with other elements?
rubidium (Rb)
gallium (Ga)
argon (Ar)
iodine (I)
The correct answer to the question is Rubidium (Rb)
Rubidium (Rb) is a group 1 element and as such, it can form bond by losing it's valence electron (i.e 1 electron) easily.
Gallium (Ga) is a group 13 element. It can only form bond by losing it's 3 valence electrons.
Argon is a group 18 element. This group has completely filled outermost shell and are very stable. They do not involve in bond formation.
Iodine (I) is a group 17 element. It is more difficult for this group to lose its 7 valence electrons hence, they form bond by accepting 1 electron.
With the above information, we can conclude that Rubidium will most likely lose electron to form bond.
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Answer:
(Question 1)Which element would most likely lose electrons to form positive ions when bonding with other elements?
(Answer) rubidium (Rb)
(Question 2) Which statement about sodium chloride is correct?
(Answer) The sodium atom transfers electrons to the chlorine atoms to form ionic bonds.
(Question 3) Based on their locations in the periodic table, which two elements are most likely to form covalent bonds with each other?
(Answer) nitrogen (N) and oxygen (O)
(Question 4) Which phrase best describes electronegativity?
(Answer) the relative strength with which an element attracts electrons in a chemical bond
(Question 5) Based on the information in the table, which pair of elements would likely form the least polar bonds with each other?
(Answer) bromine and nitrogen
Explanation:
just finished the quick check enjoy UwU
If you mix sand and water in a container the sand will sink to the bottom. explain why
Answer:
Sand is heavier than water and cannot float in water, so it will sink to the bottom.
A school bus travels 40 kilometers in 1 hour. What is the appropriate unit for the average speed of the school bus?
Answer:
The average speed is = 11.1m/s
Explanation:
Recall that average speed is defined as the total distance traveled with respect to the total number of time, therefore we say that the total distance traveled is 40Km according to your question, remember, the unit of speed is metre per second, so you change 40km by multiplying it with 1000, recall that, 1000m = 1km, so 40km×1000m = 40,000m, also 1h= 60×60, =3600s
Remember the formula for average speed is = Total distance traveled÷ total time taken
Thus; 40000m/3600s
Then we had, 11.1m/s...
You can ask questions
1. A (blank) determines what will be tested in a scientific experiment.
Answer:
Hypothesis
Explanation:A hypothesis is what gives the user the directions of the lab and what needs to be done for the procedure
EASY 30 POINTS! PLS HELP ME T-T
1. True or false? All atoms in an element contain an identical number of neutrons.
2. An atom with a _______ charge has the same number of protons and electrons.
3. An atom that has a different number of electrons and protons is called a(n) _______.
Answer:
1.false
2.neutron
3.neutron
Answer:
1. false
2. zero
3. isotopes
hope it helps
What is the density of an object that has a mass of 5.8g and a volume of 2.1 mL?
Answer:
[tex]\boxed {\boxed {\sf 2.8 \ g/mL}}[/tex]
Explanation:
Density is an object's mass per unit volume. The formula for calculating density is:
[tex]\rho= \frac{m}{v}[/tex]
The mass of the object is 5.8 grams and the volume is 2.1 milliliters.
m= 5.8 g v= 2.1 mLSubstitute the variables into the formula.
[tex]\rho = \frac{5.8 \ g}{2.1 \ mL}[/tex]
Divide.
[tex]\rho = 2.761904762 \ g/mL[/tex]
The original values of mass and volume (5.8 and 2.1) have 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. The 6 in the hundredth place tells us to round the 7 in the tenth place up to an 8.
[tex]\rho \approx 2.8 \ g/mL[/tex]
The density of the object is approximately 2.8 grams per milliliter.
A student is working hard on a chemistry lab experiment that uses a strong acid. Halfway through the lab, the student gets hungry and starts eating a bag of chips. When the student licks their fingers, they start to have a severe reaction. summary
What does the atomic number of an element represent?
A. number of isotopes
B. number of protons
C. number of bonds
D. number of atoms
Answer:
protons
Explanation:
btw you protons and electrons are always the same
prcAnswer:
e c. proton
Explanation:
i pueslist
this table resembles a condensed version of the modern periodic table. using the full periodic table as a reference, type the symbols for the elements from part A into this table based on their appropriate group and period.
Explanation:
H, He ---------
Li, Be, --,C, F, Ne
Na, Mg, --,Si, Cl, Ar
K, Ca, Cu, Ge, Br, Kr
Rb, Sr, Ag, Sn, I, Xe
Cs, Ba, Au, Pb, At, Rn
Please give brainliest, I spent a lot of effort on this.
Which of following affects liquifaction of gases except
(2 Points)
Melting point
Volume
Temperature
Pressure
Answer:
pressure
Explanation:
gas convert to liquid at high pressure.
An ice wedge shattering a slab of shale
a
Chemical Change
b
Physical Change
Answer:
Physical Change
Explanation:
Its a physical change because it is not changing its molecular structure it is only changing the shape of the shale.
Carbonic acid weathering limestone
a
Chemical Change
b
Physical Change
If particles of a solid move slow and particles of
a gas move fast, which would have higher
kinetic energy (KE)?
Answer:
The gas particles would have higher Kinetic energy.
Explanation:
From the formular of kinetic energy:
[tex]{ \sf{KE = \frac{1}{2}m {v}^{2} }}[/tex]
KE is the kinetic energy possessed by particle.
KE is the kinetic energy possessed by particle.m is the particle mass.
KE is the kinetic energy possessed by particle.m is the particle mass.v is the velocity attained by a particle
[tex]{ \sf{KE = \{ \frac{1}{2} m \}} {v}^{2} }[/tex]
keeping the mass, m constant:
[tex]{ \sf{KE = k {v}^{2} }}[/tex]
Therefore, KE is directly proportional to v² :
[tex]{ \sf{KE \: \alpha \: {v}^{2} }}[/tex]
so, when velocity increases, KE also increases.
3
A substance dissolves in water to form a colourless solution. This solution reacts with aqueous
silver nitrate in the presence of dilute nitric acid to give a yellow precipitate.
What is the possible identity of the substance?
A А
calcium iodide
B
copper(II) chloride
Ciron(II) iodide
D
sodium chloride
Answer:
D) sodium chloride
i think this is the answer
Explanation:
GIVING 20 POINTS // SEP Analyze Data - The properties of matter can be classified into two groups. Extensive properties vary with the amount of matter in a sample. Intensive properties remain the same, or are independent of the amount of matter present. Analyze the data in the table to identify examples of extensive and intensive properties. Explain your classifications.
Answer:
Intensive Properties: Appearance, State, Reactivity, Density
Extensive Properties: Mass, Volume
Explanation:
Intensive Properties: Appearance, State, Reactivity, and Density values all stay the same, regardless of the amount of material.
Extensive Properties: Mass, and Volume depend on the amount of material present
Mass and volume are extensive properties.
Physical state, densities, appearances, and reactivities are intensive properties.
Explanation:
Extensive properties are those properties that depend upon the mass of the matter of substance. Cannot be used to identify the substance Intensive properties are those properties that do not depend upon the mass of the matter of substance. Can be used to identify the substanceIn the table given, we can see:
The mass and volume of even the same elements are differing this is because the amount of matter present in them is different.Mass and volume are extensive properties.
The physical state, densities, appearances, and reactivities of the respective elements are very much similar to their kind which means that these properties are not dependent on the size or volume of the elements.The physical state, densities, appearances, and reactivities are intensive properties.
Learn more about properties of the matter here:
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How does the amount of oxygen in the water affect the oyster population constant/variables and what is the hypothesis/predication
Answer:
Lack of oxygen can cripple the oysters' ability to fight off the parasite Perkinsus marinus that causes Dermo and slowly takes over their bodies.
Cordell bought new tires for his bicycle. As he rode his bike on the hot street, the temperature of the air in the tires increased. If the volume of the air stayed the same, what happened to the pressure inside the tires?
Answer:
the pressure increased
A gas occupies 250mL, and it's pressure is 0.724 atm at 25 degrees c.r = 0.0821 L•atm/mol•k. Solve for moles !! Plzzzz
Answer:
0.0074 moles
Explanation:
We'll have to use this forumla: PV = nRT
P = Pressure (0.724)
V = Volume in liters (0.25)
n = moles
R = 0.0821
T = temperature in kelvins (25 + 273 = 298)
Our equation will look like this:
(0.724)(.25) = n(0.0821)(298)
0.181 = 24.4658n
Divide both sides by 24.4658 to isolate n
0.181/24.4658 = 24.4658n/24.4658
n = 0.00739808
Engineers use scientific knowledge to help them design solutions to problems. GUK (sodium polyacrylate) is a chemical with some unusal properties. Think of a community problem or a global problem that could benefit from the properties of GUK. Discuss your vision of how GUK could be used to solve this problem in 3-5 sentences.
Sodium can be used to solve the problem of
Water pollutionSodium polyacrylate is a sodium salt of polyacrylic acid. It is a super absorbent polymer (SAP) that has great adsorption abilities enabled by the presence of sodium. These abilities find great application in many consumer products as it solves a lot of problems.
Metal ions can be removed from water in industries and water bodies using sodium polyacrylate because it has the ability to increase the surface area of porous substances so that there can be more transfer of mass.
Summarily, the problem of metal ions in water which causes pollution can be solved using GUK.
Learn more about sodium polyacrylate here:
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A student reacts 3.0 g of magnesium with 2.5 mol / dm3 sulfuric acid.Calculate the minimum volume of sulfuric acid that reacts with all the magnesium
3.og idbj mass of mjemantg 2.oml
What are the uses of hydrogen?
Answer:
Hydrogen finds a variety of application due to its dual nature. Following are some important uses of hydrogen:
Hydrogen is used in the synthesis of ammonia and the manufacture of nitrogenous fertilizers.
Hydrogenation of unsaturated vegetable oils for manufacturing vanaspati fat.
It is used in the manufacture of many organic compounds, for example, methanol.
Hydrogen chloride is a very useful chemical and is prepared from hydrogen.
Hydrogen can reduce many metal oxides to metals by metallurgical processes.
Hydrogen is used as rocket fuel in many space research activities.
Hydrogen fuel is being experimented within the automotive industry with hydrogen fuel cells.
You want to determine the effect of a certain fertilizer on the growth of orchids grown in a greenhouse.
Materials that are available to you include: greenhouse, 100 orchid plants, water, fertilizer, and soil. You
want to know if the orchids will hgrow best with a weak concentration of fertilizer, a medium concentration
of fertilizer, or a high concentration of fertilizer. How will you design an experiment to test different
concentrations of this fertilizer?
how do you set up a controlled experiment