I feel like it's C. or D. but I guess it's C.
7. When substances are combined to form a mixture, they
A. keep their original properties
B. form new chemical bonds
C. form a new compound
D. cannot be separated physically
Answer: keep their original properties
Explanation: a mixture is, by definition, a combination of substances that do not interact, so they do not form new bonds/new compounds. They can usually be separated physically.
Mixtures are combinations of two or more individual components. However they can be separated physically based on their properties. They can form new bonds and compounds. Hence, options B and C are correct.
What are mixtures?Mixtures are formed by the combination of two or more substances by physical adherence or chemical bonds. They can be of homogeneous or heterogeneous.
Homogeneous mixtures appears as a single compound such as salt or sugar water they can form in one phase. Whereas, heterogeneous mixtures form two phases and appears to be separate.
There are many analytical tools to separate the components of mixtures such as chromatography, distillation, evaporation etc. The properties of mixtures will be different from that of the individual components. Hence, options B and C are correct.
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OMG please help I hate this.
Answer:
A, D
Explanation:
Water evaporates into gas which requires an increased amount of energy.
Not B because: Dry ice and ice undergo sublimation, which is different from evaporation.
Not C because: As a result of the water boiling, the energy in the environment sees an *increase*, rather than a decrease.
why does condensation not occur on the outside of a warm glass of water?
Answer:
its called vapor. It can hold so much than colder eater based on the weather. For example if its cold it can heat up faster but if its hot it will maybe stay the same
How many significant figures are in the number 90027.00?
Answer:
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
Explanation:
How many moles are in 5.00 x 1024 atoms of N. Watch your significant figures.
Question 1 options:
8 atoms N
8.30 moles N
8 moles
8.30 atoms N
ayo
you need to just
5.00 x 10^24 ÷ 6.022 x 10^23 = 8.3028894×10^46
^
this is the n number
so the anwer is you bottom feeders is (8.30 moles N)
The beakers in the picture above are labeled according to the ionic solutions they contain. What metal or metals could replace copper in the copper(II) nitrate solution?
Explanation:
When a metal replaces another metal in solution, we say such a reaction has undergone a single displacement reaction.
In such a reaction, metal higher up in the activity series replaces another one due to their position.
To known the metal or metals that will replace the given copper, we need to reference the activity series of metals.
Every metal higher than copper in the series will displace copper from the solution.
So, there metals are: potassium, sodium, lithium, barium, strontium etc.
A photon has an energy of 4.0 x 10-19 Joules. What is the frequency of the radiation?
In the electromagnetic spectrum, the energy and frequency of radiation is given as, E=hυ where frequency is 0.603 ×10¹⁵ hertz.
What is electromagnetic spectrum?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.The relation is given as,E=hυ where on substitution υ =E/h=4×10[tex]^-19[/tex]/6.626×10[tex]^-34[/tex]=0.603×10¹⁵ hertz
Thus, frequency of radiation is 0.603 ×10¹⁵ hertz.
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Do the following ! I'LL MARK THE BRAINLEST!
ITS SCIENCE!
Answer:
it's easier to look it up
Explanation:
Base changes phenolphthalein to pink it is true or false
Answer:
It’s false
Explanation:
it could be true if the question mentioned alkaline solution
Answer:
True
Explanation:
Phenolphthalein is colorless in the presence of an acid and turns pink in the presence of a base.
An adult dog has less inertia than a puppy.
True
False
Answer: True
Explanation: Hopes this helps- Lily ^_^
Calculate the mass of chromium produced from 5 tonnes of Cr2O3-
Answer:
Explanation:
Cr₂O₃ ( chromium oxide )
Mass of Cr₂O₃⁻ = 2 x 52 + 3 x 16 = 104 + 48 = 152
152 gram chromium oxide contains 104 grams chromium
152 tonnes chromium oxide contains 104 tonnes chromium
5 tonnes chromium oxide contains 104 x 5 / 152 tonnes chromium
mass of chromium required = 104 x 5 / 152 tonnes
= 3.42 tonnes .
Typically ____
can not be removed from the atom.
A)
electrons
B)
neutrons
C)
protons
D)
tachyons
I took the test it’s PROTONS
Answer:
Protons
Explanation:
Typically protons cannot be removed from the atom. Removing protons from an atom will completely change the atom as it will become another element entirely.
In an atom, protons are held by strong nuclear forces.
Within an atom, protons are the positively charged particles. Together with the neutrons, they are found in the nucleus of an atom. The number of protons within an atom is the atomic number of the atoms and it determines the nature and type of atom it is. Protons cannot be removed from an atom due to the strong binding force holding them together in place.Answer:
protons
Explanation:
PLease guys, please. I really need help
Which organ system supports the body and allows it to move?
That would be the skeletal system, hope this helps ^^
Consider the following reaction, which occurs at standard state:
2CI(g) -- CI2(g) H= -243.4 kJ
If 15.0g of CI is concerted to chlorine, determine the heat released from this reaction.
Answer:
The heat energy released from the reaction is approximately 51.4791 kJ
Explanation:
The given parameters are;
The heat of the reaction of 2Cl (g) → Cl₂ (g) = -243.4 J
The given mass of Cl being converted to chlorine gas, Cl₂ = 15.0 g
From the reaction for the heat of formation, we have;
2 moles of chlorine produces 1 mole of Cl₂ to release 243.4 kJ of energy per mole of Cl₂
The mass of 1 mole of Cl ≈ 35.453 g
Therefore, from number of moles, n = Mass/(Molar Mass), we have;
The number of moles of chlorine, in 15.0 g of chlorine = 15.0/35.453 ≈ 0.423 moles
Therefore, given that 2 moles of Cl produces 1 mole of Cl₂, we have;
0.423 moles of Cl will produce 0.423/2 ≈ 0.2115 moles of Cl₂
The heat energy released from the reaction is therefore, H ≈ 0.2115 × 243.4 kJ = 51.4791 kJ.
Nistu is cooking rice in a pot. When she leaves the pot on the stove for a while, the temperature of the rice increases. What happens to the molecules of the rice when the temperature of the rice increases?
Answer:
Their average kinetic energy increases
Explanation:
The average kinetic energy of the rice molecules increases as the pot is left on the cooking stove.
Heat is transferred to the pot by conduction from the heat source. The heat is then transferred to the rice in the cooking pot by convection.
As the water in the pot heats up. The rice gains thermal energy. This causes the molecules of the rice particles to start vibrating. As the molecules vibrate about their fixed position, their thermal energy continues to increase.Therefore, the amount of heat absorbed by the rice increases with time and this actually cooks the food.Answer:
The energy of the molecules in the rice increases.
Explanation:
Can y’all answer these for me I’m in a hurry so I don’t fail this class
Answer:
what I can't understand what you're saying lol
Explanation:
be my friend lol
btw follow me on my another account (sarivigakarthi)...... plz
how is energy transfered from one piece of metal to another
Answer:
The positive and negative electrons attract leaving a shock and heat travels faster through metal than any other material such as plastic, wood, etc.
Explanation:
Answer:
The electrons in a piece of metal can leave their atoms and move about in the metal as free electrons. ... The hotter the metal, the more kinetic energy these vibrations have. This kinetic energy is transferred from hot parts of the metal to cooler parts by the free electrons.
Explanation:
There are 4 different types of sublevels: s,p,d,f true or false
I think it is true because level 4 has 4 sublevels which is s, p, d and f.
(b) 28.2 yd to centimeters
Answer:
2578.608 centimeters in 28.2 yards.
Explanation:
There are 91.44 centimeters to a yard. Multiplying 91.44 by the number of yards, we get the number of centimeters per yards.
91.44(28.2) = 2578.608
Answer:
hruejhehee7 suhdbdudud d d
Explanation:
jejeij3j3n3jeij
A compound was analyzed and found to contain the following percent composition: 2.056% hydrogen, 32.69% S, and 65.26% oxygen. Calculate the empirical formula.
Answer:
H2SO4
Explanation:
Firstly,
2.056% hydrogen = 2.056g of H
32.69% Sulphur = 32.69g of S
65.26% oxygen = 65.26g of O
Next, we convert each mass into moles by dividing by their respective molar mass:
H = 1, S = 32, O = 16
H = 2.056/1 = 2.056mol
S = 32.69/32 = 1.021mol
O = 65.26/16 = 4.078mol
Next, we divide each mole value by the smallest mole value (1.021)
H = 2.056/1.021 = 2.01
S = 1.021/1.021 = 1
O = 4.078/1.021 = 3.99
Approximately the ratio of H to S to O is 2:1:4, hence, the empirical formula for H, S and O is H2SO4.
The empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound
The correct answer of the following is [tex]H_2SO_4[/tex]
The data is given as follows:-
2.056% hydrogen = 2.056g of H 32.69% Sulphur = 32.69g of S65.26% oxygen = 65.26g of O
We have to find the moles in the reaction.
The mas of the element is as follows:-
H = 1S = 32O = 16
After solving the equation we get
[tex]H = \frac{2.056}{1} = 2.056mol\\\\S = \frac{32.69}{32} = 1.021mol\\\\O = \frac{65.26}{16} = 4.078mol[/tex]
Next, we divide each mole value by the smallest mole value (1.021)
[tex]H = \frac{2.056}{1.021} = 2.01\\\\S = \frac{1.021}{1.021} = 1\\\\O = \frac{4.078}{1.021} = 3.99[/tex]
The ratio of H to S to O is 2:1:4,
Hence, the empirical formula for H, S, and O is [tex]H_2SO_4.[/tex]
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Write the following in standard notation: 2.8 x 10-5s.
Answer:
2.8 X 10-5s in standard notation is 28-5s
Explanation:
Multiply 2.8 by 10
36.0 g of Be contains how many moles?
Answer:
Explanation:
4
A gas has a pressure
of 0.12 atm at 21.0°C.
What is the pressure at
standard temperature?
Answer:
0.12 it is 32.1 *C
Explanation:
at the standard temp
The pressure of the gas at 21°C is 1 atm. Then the pressure at the standard temperature i.e., at 25°C or 298 K is 0.14 atm.
According Gay- Lussacs law, the pressure of the gas is directly proportional to the temperature of the gas at constant volume.
hence, P1/T1 = P2/T2.
given,
P1 = 0.12 atm
T1= 21 °C
T2 = 25°C
then,
P2 = P1 T2/T1
= (0.12 atm ×21 °C)25 °C
= 0.14 atm
The pressure will increase from 0.12 atm to 0.14 atm when the temperature reaches its standard point.
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Need a little help with this
Answer:
Lithium
Explanation:
As you go from left to right the atomic radius decreases.
As you go from top to bottom the atomic radius.
A. Carbon is farther right in the 2nd period.
B. Lithium is the first one in the 2nd period!
C. Neon is the farthest one on the right in the 2nd period.
D. Potassium is not even in the 2nd period
3. How many moles are in 100. grams of nitrogen gas (N2)?
I NEED HELO ASAP PLEASE
Answer:
12 moles
Explanation:
Your neighbor has a loud party at 3:00 A.M. The police tell her it is illegal to make noise at this late hour. This is an example of
o the government censoring your neighbor's first amendment freedoms
your neighbor legitimately exercising her first amendment rights
O restrictions on first amendment rights for the good of the community
the police abusing their power?
Explain how the earth recycles and reuses it's own crust (Make it a paragraph)
Answer:
The interaction between the tectonic and the hydrologic systems causes constant recycling of the materials of the Earth's crust. Rocks are heated, metamorphosed, melted, weathered, sediment is transported, deposited and lithified, then it may be metamorphosed again in yet another cycle.
Explanation:
Calculate the number of atoms in 18.34 grams of sulfur. Answers in scientific notation
PLZ HELP!!
Answer:
The answer is 1.834 * 10
Explanation:
Is the following chemical equation balanced? 2Na + 2H20 - 2NaOH + H2 O yes
Hello KittyCat2004!
Reactants Products
Na = 2 atoms Na = 2 atoms
H = 4 atoms H = 4 atoms
O = 2 atoms O = 2 atoms
Because there are equal numbers of Na, H and O atoms on the reactant and product side, the chemical equation is balanced.