what is the blank +5+___=0
Answer:
(-5)
Explanation:
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 best describes H2(g) + Cl2(g) → 2HCl(9), AH = -184.6
kJ/mol?
A. The reaction requires heat.
B. The reaction has no activation energy.
C. The reaction is endothermic.
D. The reaction produces heat.
I’ll give ya brainliest
Answer:
D
Explanation:
ap
The statement that best describes the reaction [tex]\rm H_2(g) + Cl_2(g) \rightarrow 2HCl(9), AH = -184.6[/tex] is the reaction has no activation energy.
What is activation energy?Activation energy is the small amount of energy which is required to start a reaction.
This is the kinetic energy of the reactant molecules, which helps them to collide.
High activation energy means the reaction will be slow.
Low activation energy means a high rate of energy.
Thus, the correct option is B.
Learn more about activation energy
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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)
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Is food coloring and water a compound?
AI a =m not suresedfdssssssssssss
Why do gases released by incinerators cause problems
Answer:
Waste incineration is one of many societal applications of combustion. ... Municipal solid-waste furnace designs have evolved over the years from ... To achieve complete combustion, gases produced must remain in the ... do not suffer rapping re-entrainment and dust layer back-corona problems associated with dry ESPs.
Explanation:
State whether the following are elements, compounds or mixtures
Salt
Sugar
Hydrogen
Oxygen
Tomato sauce
cake batter
Nitrogen
Aluminium
Gulab Jamun
Water
Salty water
Answer:
?
Explanation:
Answer:
hydrogen, nitrogen, oxygen, aluminium are elements
salt, sugar, tomato sauce, cake batter, salty water are mixtures
Explanation:
all the elements in the group halogens in the periodic table are compounds.
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]
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
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 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
An ecologist is studying ecosystems in the rainforest biome. Which of the following is an
abiotic observation he would record?
Answer: any non-living thing
Explanation: abiotic means non-living
The Abiotic observation that the ecologist would record are ;
Soil type, Climate Precipitation and SunlightAbiotic factors in ecosystem are the non-living factors that play an essential role in determining how an ecosystem is different from other ecosystems. Some of the Abiotic factors that will distinguish ecosystems in the rainforest biome include ;
The temperature of the rainforestThe Soil type Climate conditions Precipitation and Amount of sunlight .Hence we can conclude that The Abiotic factors/observation that the ecologist would record are ; Soil type, Climate , Precipitation and Sunlight
The options to your question are missing hence a general answer is provided above
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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:
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.
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:
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.
No of H atoms in 2.43 g of Aspartame(C^14H^18N^2O^5
Is this method CORRECT
Answer:
yes
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
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.
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.
The more quickly you change your _____, the more ____ you will have to exert
Answer:
name, force
Explanation:
b) Calculate the relative atomic mass for magnesium using the information below (to 3
significant figures).
Magnesium has three common isotopes, magnesium-24, magnesium-25 and magnesium-26.
Their abundances are 79.0%, 10.0% and 11.0%, respectively.
Answer:
Relative atomic mass = 24.32 amu.
Explanation:
Given data:
Relative atomic mass of Mg = ?
Abundance of Mg-24 = 79.0%
Abundance of Mg-25 = 10.0%
Abundance of Mg-26 = 11.0%
Solution:
Relative atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Relative atomic mass = (79.0×24)+(10.0×25) +(11.0×26) /100
Relative atomic mass = 1896 + 250 + 286 / 100
Relative atomic mass = 2432 / 100
Relative atomic mass = 24.32 amu.
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].
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 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.
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What's the electron configuration of Zr (AN 40)
(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
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:
please help me with honors chem I will give brainliest answer
Answer:
see the pic for the answer
