Answer:
hahahaha
Explanation:
hahahahahhahahaha soooo funny
When two different liquids are mixed together, the liquid with the lesser density will float on top of the liquid with the greater density. If 11mL of a liquid having a mass of 55 g is mixed with 12 mL of a liquid having a mass of 48 g, which liquid will float on top? Explain your answer. (Show your calculation)
Answer:ddddddddddd
Explanation:rrrrrrrrrrrrrrrrrrrrrrrrr
Differentiate between physical and chemical change
Explanation:
Physical Change is a type of change where by no new chemical substance is formed. Physical changes are reversible. whilst Chemical change is a change where new chemical substance is always formed. Chemical changes are usually irreversible.
Examples of Physical Change include;
Melting of Ice
Melting of Candle
Grinding of chalk
Magnetization of Iron
Examples of Chemical Change includes;
Cooking of food
Rusting of Iron
Burning of Charcoal
Which of the following statements is false?
a.
To be an effective listener, you must avoid distractions.
b.
To be an effective listener, you must only communicate with people who share your listening style.
c.
To be an effective listener you must look for nonverbal messages.
d.
To be an effective listener you must be ‘other-oriented’.
Answer:
B
Explanation:
I think B is false because you should communicate with all sorts of people, in order to learn different views/sides of something.
pls need asap!
A neutral atom of Bromine has a mass number (atomic mass) of 80. Which of the following statements about this atom is INCORRECT?
It would have 35 electrons
The number of protons and neutrons added together would equal 80
It would have 35 protons
It would have 35 neutrons
Answer:
C
Explanation:
What is the density of and object that is 100 grams and has a volume of 5 cubic centimeters?
J. 20 g/cm
K. 25 g/cm
L. 50 g/cm
M. 500 g/cm3
Explanation:
Density of object = gram/volume
= 100 g/ 5 cm³
= 20 g/cm³
The density of an object that is 100 grams and has a volume of 5 cubic centimeters is 20 g/cm³.
How do we calculate density?Density of any object will be calculated by using the below equation:
ρ = m/V, where
m = mass of object = 100g
V = volume of object = 5 cm³
On putting values we get,
ρ = 100/5 = 20 g/cm³
Hence required density is 20 g/cm³.
To know more density, visit the below link:
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What's the electron configuration of Zr (AN 40)
how many types of bonds can a carbon atom form?
Answer:
four
Explanation:
Carbon contains four electrons in its outer shell. Therefore, it can form four covalent bonds with other atoms or molecules.
If 8.2 g of sodium ethanoate produced 560 cm3 of methane (at s.t.p.). which one of the following is the percentage yield of the reaction;
A 2.5
B 4.0
C 12.0
D 25.0
The percentage yield of the reaction : 25%
Further explanationC₂H₃NaO₂(CH₃COONa)- Sodium ethanoate(MW=82,0343 g/mol)
Reaction
CH₃COONa + NaOH⇒CH₄+Na₂CO₃
mol CH₃COONa :
[tex]\tt \dfrac{8.2}{82.0343}=0.1[/tex]
mol CH₄=mol CH₃COONa = 0.1
mass CH₄ (MW=16.04 g/mol) :
[tex]\tt 0.1\times 16.04=1.604~g[/tex]⇒ theoretical
mol of 560 cm³(0.56 L) of methane (⇒1 mol = 22.4 L at STP) :
[tex]\tt \dfrac{0.56}{22.4}=0.025~mol[/tex]
mass CH₄ :
[tex]\tt 0.025\times 16.04=0.401~g[/tex]
[tex]\tt \%yield=\dfrac{0.401}{1.604}\times 100\%=25\%[/tex]
The table below lists the properties of a metallic element.
shiny, silver colored, forms +1 and +2 ions, compound with sulfur is bright red.
Where on the periodic table would this element most likely be found?
Group 1
Group 2
Group 12
Group 13
Answer:
Group 12
Explanation:
Answer:
I got all answers correct on my test and got 100%, this question was in the test which got correct
so your answer is group 12
Explanation:
what is the blank +5+___=0
Answer:
(-5)
Explanation:
Condensation is a phase change that
O has an increase in kinetic energy
O has no change in potential energy
O is exothermic
O is endothermic
Answer:
endothermic
Explanation:
condensate is an endothermic change
For every action, there is an equal and opposite reaction.
Does the statement describe a scientific law?
Answer:
yeah its newton's third law
Explanation:
Indicate the charge the following elements as they achieve the noble gas configuration.
Ga O Br P Rb As
S Mg Al Se Li I
Answer:
See explanation
Explanation:
Ga is in group 13 hence it must loose three electrons to form Ga^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
O is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form O^2- since oxygen has six electrons on its outermost shell.
Br in group 17 has seven electrons in its outermost shell hence it must form Br^- (gain one electron) in order to attain the noble gas configuration.
P in group 15 must accept three electrons and form P^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
S is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form S^2- since sulphur has six electrons on its outermost shell.
Mg in group 2 has two electrons on its outermost shell and must loose both to attain the noble gas configuration forming Mg^2+.
Al is in group 13 hence it must loose three electrons to form Al^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
Se is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form Se^2- since selenium has six electrons on its outermost shell.
Lithium is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Li^+.
Rb is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Rb^+.
As in group 15 must accept three electrons and form As^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
I in group 17 has seven electrons in its outermost shell hence it must form I^- (gain one electron) in order to attain the noble gas configuration.
A certain area receives a large amount of rain and some of it remained on top of the soil. What happened to the rest of the water
How does solubility impact the temperature?
Answer:
For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
Explanation:
Make sure to edit so you do get copy-writed
Which of the following statements is not true statement?
(a
An atom contains a large nucleus that is composed of protons, and neutrons.
b
Each element has a specific and unique atomic number.
c
Several elements make up an atom.
d
Isotopes of an element have the same number of protons and different number of neutrons.
Answer:
C several elements make up an atom.
What do the colors represent?
Answer:
Dark Blue: Symbolizes integrity, knowledge, power, and seriousness. Blue: Peace, tranquility, cold, calm, stability, harmony, unity, trust, truth, confidence, conservatism, security, cleanliness, order, loyalty, sky, water, technology, depression, appetite suppressant.
The half-life of carbon-14 is 5,730 years. Dating organic material by looking for C-14 can't be accurately done after 50,000 years. Suppose a fossilized tree branch originally contained 4.30 grams of C-14. How much C-14 would be left after 50,000 years?
Answer:
0.010g of C-14 would be later after 50,000 years
Explanation:
The kinetics of radioactive decay follows the equation:
Ln (N / N₀) = -kt
Where N could be taken as mass after time t,
N₀ initial mass = 4.30g;
k is rate constant = ln 2 / t(1/2)
= ln 2 / 5730years = 1.2097x10⁻⁴ years ⁻¹
Replacing:
Ln (N / 4.30g) = -1.2097x10⁻⁴ years ⁻¹ * 50000 years
N / 4.30 = 2.36x10⁻³
N =
0.010g of C-14 would be later after 50,000 yearsIs food coloring and water a compound?
AI a =m not suresedfdssssssssssss
What mass of solute will dissolve in 100 grams of water at the following temperatures?
KCl at 80ºC
NaCl at 90ºC
NaNO3 at 10ºC
Answer:
D) NaNO3 at 10 °C
Explanation:
In this case, to know this, we need to watch the solubility curve of each compound to know which one is saturated or unsaturated in this case.
As you can see in the curve attached, let's analyze first what is an unsaturated solution.
An unsaturated solution is a solution where the quantity of solvent is in excess and the solute is completely dissolved in solution leaving no remains. This depends on the temperature of course. The solubility of one compound vary with the increase or decrease of temperature.
As you can see in the graph attached, what happens to the KCl? we can see that a 40 °C, you just need around g of solute to be dissolved, and be saturated so, this is not the correct choice.
If you watch NaCl, has similar behavior. You just need about 35 g of solute to be saturated.
Finally, the KNO₃ just need 60 g of solute to be dissolved in the solution, completely.
In the case of NaNO 10°C, we can see that at 40 °C it's not touching the curve, so we can assume that this is an unsaturated solution and it would be the correct choice.
Explanation:
The table below compares some of the properties of three different objects that are all made of pure substances.
Object Melting Point Mass Volume
X 327.5°C 10 g 25 cm3
Y 1,083°C 10 g 12.5 cm3
Z 327.5°C 5 g 12.5 cm3
According to the table, which of the following is most likely true?
Answer:
c. object y is made of a different substance than x and z
Explanation:
why well i did the study island and it told me the answer why so don't ask
Our _____________ is affected by physical environment.
a.
pitch
b.
touch ethic
c.
behavior
d.
verbal communication
Answer:
is behavior
Explanation:
becuase behavior can be affected on the eviroment we are in
Our behavior is affected by physical environment.
What is physical environment?Individuals live, study, work, even play in their external surroundings. People's physical environments are influenced by the air those who breathe, the water they consume, the homes they reside in, and the vehicles they need to get to school and work.
What is behavior?The way someone acts was referred to as their behavior. That's what a person must do to make things happen, modify something, and maintain the status quo.
Our behavior is affected by physical environment.
Therefore, the correct answer will be option (c)
To know more about physical environment.
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Which of the following is a definition for an interstitial alloy?
a
an alloy in which the atomic sizes of the components are different
b
an alloy in which the atoms of the components in an alloy are about the same size
c
an alloy in which some of the atoms of the components are about the same size and some are different
d
a metal in which all of the atoms are of the same element
Answer:
c
Explanation:
An interstitial compound or interstitial alloy is a compound that is formed when an atom of sufficiently small radius sits in an interstitial “hole” in a metal lattice. Examples of small atoms are hydrogen, boron, carbon and nitrogen. These compounds are important industrially, for example some transition metal carbides and nitrides.
Does sodium satisfy the octet rule?
Answer:
The rule is especially applicable to carbon, nitrogen, oxygen, and the halogens, but also to metals such as sodium or magnesium. ... All four of these electrons are counted in both the carbon octet and the oxygen octet, so that both atoms are considered to obey the octet rule.
(Worth 80 points) In effect you get the value for work by multiplying which two values together?
A. Space and time
B. Force and distance
C. Mass and speed
Answer:
DONT OUT ITS WORTH BLA BLA BECAUs ITS NOT WORTH 80 ITS WORTH 5.
Explanation:
ANsWER..... C
No of H atoms in 2.43 g of Aspartame(C^14H^18N^2O^5
Is this method CORRECT
Answer:
yes
Explanation:
The more quickly you change your _____, the more ____ you will have to exert
Answer:
name, force
Explanation:
Polyacrylamide is used in manufacturing soft contact lenses. It consist of 50.69% carbon, 19.71% nitrogen, 7.09% hydrogen, and 22.51% oxygen. Calculate the empirical formula for polyacrylamide.
Answer: The empirical formula is [tex]C_3NH_5O[/tex].
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of C = 50.69 g
Mass of N= 19.71 g
Mass of H = 7.09 g
Mass of O = 22.51 g
Step 1 : convert given masses into moles.
Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{50.69g}{12g/mole}=4.22moles[/tex]
Moles of N=[tex]\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{19.71g}{14g/mole}=1.41moles[/tex]
Moles of H=[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{7.09g}{1g/mole}=7.09moles[/tex]
Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{22.51g}{16g/mole}=1.41moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C =[tex]\frac{4.22}{1.41}=3[/tex]
For N = [tex]\frac{1.41}{1.41}=1[/tex]
For H = [tex]\frac{7.09}{1.41}=5[/tex]
For O =[tex]\frac{1.41}{1.41}=1[/tex]
The ratio of C:N:H: O = 3:1:5:1
Hence the empirical formula is [tex]C_3NH_5O[/tex].
sodium hydroxide reacts with excess hydrochloric acid. calculate the mass of sodium hydroxide required to produce 117g of sodium chloride
NaoH+HcI→ NaCl +H2O
Na0H=23+16+l= 40 9m
Nacl=23 +35.5 =58.5 gm
mass of NaOH required=117x40/ 58.5 =80 gm
Molar mass of NaOH = 23+16+1 =40g/mol
Molar mass of NaCl = 23+35.5 =58.5g/mol
To produce 58.5g NaCl 40g NaOH is required
So, to produce 117g NaCl {(40/58.5)×117}g = 80g NaOH is required.
Hope, this helps.
Which mass and atomic number is correct for the following isotope: carbon-14
explain your answer
Answer:
Explanation:
Isotope notation is of the form
A
Z
X
where
Z
is the atomic number (number of protons),
A
is the mass number (sum of protons and neutrons), and X is the element.
In Carbon- 14 , 14 is the mass number (sum of protons and neutrons). This is our A .
Carbon has the atomic symbol C , and it has 6 protons. This is the atomic number, or A . Thus, the isotope notation for Carbon- 14 is 14 6 C
Hope this helps!
Explanation:
