a sample can not be broken down physically or chemically what is it
Answer:
Pure Substance. A sample of matter, either a single element or a single compound, that has definite chemical and physical properties. Element. A pure substance that cannot be broken down into other substances by chemical or physical means.
Explanation:
Sorry if it's wrong!!!!!!!
Answer:
Elements
Explanation:
Elements cannot be broken down into anything simpler physically or chemically. Compounds: are pure substances that are made up of more than l type of atom and can be broken down or decomposed into its individual elements by chemical methods, but cannot be separated by physical methods.
4. A method in which two or more components of different sizes are sepa-
rated from a mixture on the basis of the difference in their sizes.
Answer: Sieving
Im 100% sure its the answer!
(02.03 MC)
An electron moved from a lower energy level to a higher energy level. What most
likely happened during the transition? (5 points)
1) A random amount of light was released.
2) A fixed amount of energy was absorbed.
-
3) A fixed amount of energy was released.
1
4) A random amount of light was absorbed.
An electron moved from a lower energy level to a higher energy level, and during the transition, a random amount of light was released. Option A
What exactly are these electrons?
An electron is a kind of subatomic particle that has a negative charge. It is possible for it to be free (meaning that it is not associated with the nucleus of any atom) or it may be tied to the nucleus of an atom.
Electrons are sub-atomic particles that may be found in each atom of any chemical element and can occupy different energy levels. These electrons are capable of transitioning between different energy levels.
Electrons may transition from a state with a lower energy level, also known as the ground state, to a state with a higher energy level, also known as an excited state. Alternatively, electrons can transition from a state with a higher energy level to a state with a lower energy level.
When an electron goes from a lower energy level to a higher energy level, the atom takes in more energy, but when the electron moves from a higher energy level to a lower energy level, the additional energy is expelled mostly in the form of light.
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A container of hydrogen at 172 kPa was decreased to 85.0 kPa producing a new volume of 3L. What was the original volume?
Answer:
The answer is 1.48 LExplanation:
In order to find the original volume we use the same for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the original volume
[tex]V_1 = \frac{P_2V_2}{P_1} \\[/tex]
From the question
P1 = 172 kPa = 172000 Pa
P2 = 85 kPa = 85000 Pa
V2 = 3 L
We have
[tex]V_1 = \frac{85000 \times 3}{172000} = \frac{255000}{172000} = \frac{255}{172} \\ = 1.482558139...[/tex]
We have the final answer as
1.48 LHope this helps you
Which is the correct name for the compound CoCO 3?
A
Cobalt Carbonoxide
B
Cobalt (II) Carbonate
C
Carbon Oxygen Carbonate
D
Cobalt Carbonate
QUICK PLEASE!!!
Answer:
Cobalt (II) Carbonate
Explanation:
Answer:B
Explanation:
You have 100. grams of potassium bromide (KBr). How many moles do you have? (1 mole KBr = 119 g KBr)
0.840 mole KBr
1.00 mole KBr
1.19 mole KBr
2.00 mole KBr
Answer:
0.840
Explanation:
The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.
The moles can be defined as the mass of the compound with respect to the molecular mass. The moles can be given as:
Moles = [tex]\rm \dfrac{weight}{Molecular\;weight}[/tex]
The molecular weight has been the mass of the constituents of the atoms present in the compound.
The compound KBr has a molecular mass of 119 g/mol.
The given mass of the compound has been 100 grams.
The moles of KBr can be given as:
Moles of KBr = [tex]\rm \dfrac{100}{119}[/tex]
Moles of KBr = 0.84 moles.
The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.
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The measurement 0.003095 gram, rounded to three significant figures, is
expressed as
0.00310
0.00309
0.003
0.003096
Answer:
0.00310
Explanation:
Which example describes a use for gemstones?
fabrics
plastics
drill bits
paper clips
I will give Brainlyest
Answer:
drill bits
Explanation:
I don't think that you would use gemstones in anything else.
what is the next step if a scientist's hypothesis is supported
what is the formula for titanium (IV) sulfate
The is the
variable that
gets measured
Answer:
what? what's the full question?
10. A sample of an unknown composition was tested in a laboratory. The sample could not be broken down by
physical or chemical means. On the basis of these results, the laboratory reported that the unknown sample was
most likely
A. a compound
B. an element
C. a mixture
Answer:
it would be an element because its an element
Explanation:
which of the following substance is an element?
A. Air
B. Iron
C. Salt
D. Sugar
Answer:
B. Iron
Explanation:
It is element number 26 on the periodic table.
Answer:
Iron is an element because it is a pure substance, air is a mixture, salt and sugar are compounds.
50 mL of 2.2 M HCl is combined with 50 mL of 2.0 M NaOH in a coffee-cup
calorimeter. The temperature of the solution increases 13.4°C. Assume the
calorimeter is a perfect insulator and the mixture has a specific heat capacity identical
to pure water (4.184 wc)
.
Calculate the heat change from the chemical reaction (in units of kJ). (Pay attention to
sign conventions and do not write the units in your typed answer.)
Answer:
-56.1kJ/mol
Explanation:
The reaction between HCl and NaOH is:
NaOH + HCl → NaCl + H₂O + ΔH
Where ΔH is heat change in the reaction.
As the temperature of the solution increases, the heat is released and ΔH < 0
The heat released in the reaction is obtained using coffe-cup calorimeter equation:
Q = C×m×ΔT
Where Q is heat
C is specific heat of the solution (4.184J/g°C)
m is mass of solution: Assuming density = 1g/mL, 100mL of solution = 100g
And ΔT is change in temperature (13.4°C)
Replacing:
Q = C×m×ΔT
Q = -4.184J/g°C×100g×13.4
Q = -5606.6J
Now, in the reaction you have:
Moles HCl:
0.050L * (2.2mol/L) = 0.11 moles
Moles NaOH:
0.050L * (2.0mol/L) = 0.1 moles
That means the moles of reaction are 0.1 moles, and heat change in the chemical reaction is:
5606.6J / 0.1 mol = 56066J =
-56.1kJ/mol
 what is 19.8-17.1
Answer: it should be 2.8
Explanation:
A 10.0-g sheet of gold with a temperature of 18.0°C is laid flat on a sheet of iron that weighs 20.0 g and has a temperature of 55.6°C. Given that the specific heats of Au and Fe are 0.129 J g-1 0 c-1 and 0.444 J g-1 0 c-1, respectively, what is the final temperature of the combined metals? Assume that no heat is lost to the surroundings. (Hint: The heat gained by the gold must be equal to the heat lost by the iron.)
Answer:
T = 50.83°C
Explanation:
Let the final temperature be T .
heat lost = mass x specific heat x fall in temperature
heat lost by iron = 20 x .444 x ( 55.6 - T )
heat gained by gold = 10 x .129 x ( T- 18 )
heat lost = heat gained
20 x .444 x ( 55.6 - T ) = 10 x .129 x ( T- 18 )
493.73 - 8.88 T = 1.29 T - 23.22
10.17 T = 516.95
T = 50.83°C
The final temperature of the combined metals (gold and iron) is 50.83°C.
Given the following data:
Initial temperature of gold = 18.0°CFinal temperature of iron = 55.6°CMass of gold = 10.0 gMass of iron = 20.0 gSpecific heat capacity of iron = 0.444 J/g°C.Specific heat capacity of gold = 0.129 J/g°C.To find the final temperature of the combined metals (gold and iron):
Heat lost by the iron = Heat gained by the gold.
[tex]Q_{lost} = Q_{gained}\\\\mc\theta = mc\theta\\\\20(0.444)(55.6 - T_f) = 10(0.129)(T_f - 18)\\\\8.88(55.6 - T_f) = 1.29(T_f - 18)\\\\493.728 - 8.88T_f = 1.29T_f - 23.22\\\\8.88T_f + 1.29T_f = 493.728 + 23.22\\\\10.17T_f = 516.948\\\\T_f = \frac{516.948}{10.17}[/tex]
Final temperature = 50.83°C
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write 0.006 in exponential form
[tex]\huge\pink{Answer}[/tex]
0.0006 in scientific notation is 6 × 10-4
Step by step Explanation:All numbers in scientific notation or standard form are written in the form
m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.
To convert 0.0006 into scientific notation, follow these steps:
Move the decimal 4 times to right in the number so that the resulting number, m = 6, is greater than or equal to 1 but less than 10
Since we moved the decimal to the right the exponent n is negative
n = -4
Write in the scientific notation form m × 10n
= 6 × 10-4
Therefore,
6 × 10-4 is the scientific notation form of 0.0006 number and 6e-4 is the scientific e-notation form for 0.0006
HOPE IT HELPS ☺️What do metalloids and non metals have in common
Answer:
Metalloids are brittle like Non-Metals
Explanation:
Which of these would MOST LIKELY cause an increase in the price of an item?
A)
declining popularity of the item
Eliminate
B)
a decrease in the price of a substitute product
improved technology in the production of that item
D)
an increase in the cost of raw materials for that item
Answer: D
Explanation:
It is the most likely one
Explanation:
sorry if you get it wrong but I think its b
three students measured the volume of water with three different devices they report the volumes
large cylinder 164 ml
small cylinder 39.7 ml
calibrated buret 18.16 ml
if they pour it into a single container what is the volume
Answer:
The total volume of water is 222 ml.
Explanation:
Given that,
Volume of water by different devices are,
First large cylinder =164 ml
Second small cylinder = 39.7 ml
Third calibrated burette = 18.16 ml
We need to calculate the total volume of water
Using given data
volume of total water=volume by large cylinder+volume by small cylinder+volume by calibrated burette
Put the value into the formula
[tex]V_{w}=164+39.7+18.16[/tex]
[tex]V_{w}=221.8\approx 222\ ml[/tex]
Hence, The total volume of water is 222 ml.
Harry and Ron are arguing over which broom has better acceleration, the Nimbus 2000 or the Firebolt. The boys are going to race the two brooms from the ground to the top of the goals. Then they will switch brooms and replicate their trials.
Test (independent) Variable: _____________________________________________________________
Result (dependent) Variable: _____________________________________________________________
Control Variables: _____________________________________________________________________
Define Replicate: _____________________________________________________________________
Answer:
Independent variable: BROOM
Dependent variable: ACCELERATION
Control variable: same distance
Find the definition of replicate below
Explanation:
In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter. In this case, the independent variable is the BROOM.
The dependent variable is the variable that is measured in an experiment. It is the variable that responds to the independent variable. The ACCELERATION is the dependent variable in this case.
The control variable is the variable that is kept constant or unchanged throughout the experiment. In this case, the control variable is the SAME DISTANCE traveled for each broom.
A replicate is a repeated experiment with the expectance of a similar or consistent result. In this case, if the brooms are switched, the acceleration of each broom should be the same in the replicate result.
3. Calculate the volume of a of .750 M solution containing 67.0 g of KNO3.
Answer : The volume of solution is 0.884 L
Explanation :
Molarity : It is defined as the number of moles of solute present in one litre of solution.
Formula used :
[tex]Molarity=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution}}[/tex]
Solute is, [tex]KNO_3[/tex]
Given:
Molarity = 0.750 M
Molar mass of [tex]KNO_3[/tex] = 101 g/mole
Mass of [tex]KNO_3[/tex] = 67.0 g
Now put all the given values in the above formula, we get:
[tex]0.750M=\frac{67.0g}{101g/mole\times \text{Volume of solution}}[/tex]
[tex]\text{Volume of solution}=0.884L[/tex]
Therefore, the volume of solution is 0.884 L
Question 3 of 8
Which two characteristics are needed to describe a force?
A. Direction
B. Speed
C. Resistance
D. Size
SUBT
Answer:A. Direction
C. Resistance
Explanation:
Forces are due to an interaction of at least two objects. It may change the state of motion of an object. It may change the shape of an object. Forces applied on an object in the same direction add to one another and the resultant is in the same direction.
plz mark brainliest
All living things must maintain stable body conditions (homeostasis).
A. True
B. False
Explain the purpose of the Parados and summarize the text. In addition, infer how the Parados reveals tone and evokes mood. Finally, analyze how the text reveals the beliefs of the ancient Greek people.
Answer:
The purpose of the Parados is to add an explanation of events that happened before the play begins. In the first section the mood is triumphant because of the recent battle win. Then it jumps back to the beginning of the battle and the mood is scared. Before the army lead by the brother of the king could attack they are forced to retreat and the army counterattacks. Unfortunately, the brothers kill each other during the battle. The people of Ancient Greece believed that Zeus and Ares were on their side and used the gods as the excuse for winning a battle. The story ends victorious but sad tone because the two brothers have slain each other.
Explanation: Gets you 100%
is sugar an element or a compound
Answer:
it is a compound
Explanation: i have it on a test
How can you use the periodic table to predict reactivity?
Giving Brainliest!!!
Answer:
hi
Explanation:
how r u today
A purified protein has a molecular mass of 360 kDa when measured by size exclusion chromatography. When analyzed by gel electrophoresis in the presence of SDS, three bands are observed, with molecular masses of 160, 140, and 60 kDa. When gel electrophoresis is carried out in the presence of SDS and dithiothreitol, three bands are once again observed, with molecular masses of 140, 80, and 60 kDa. What is the subunit composition of the protein?
Answer:
A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.
A disulfide bond links the two 80 kDa subunits (possibly identical).
Explanation:
Given that:
A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.
A disulfide bond links the two 80 kDa subunits (possibly identical).
As a result of SDS and dithiothreitol analysis treatment, the molecular masses can not be 360 in total. They are 280, which implies that they are in short of 80 kDa. This means that there are possibilities that two groups with a molecular mass of 80 kDa which are joined by a disulfide bond.
The presence of SDS and dithiothreitol acts as a reducing agent, and they can break disulfide bonds whose pH is greater than 7, i.e. those in basic condition.
The gas cyclobutane, C4H8(g), can be used in welding. When cyclobutane is burned in oxygen, the reaction is: C4H8(g) + 6 O2(g)4 CO2(g) + 4 H2O(g) (a) Using the following data, calculate ΔH° for this reaction. ΔH°f kJ mol-1: C4H8(g) = 27.7 ; CO2(g) = -393.5 ; H2O(g) = -241.8 ΔH° = kJ (b) Calculate the total heat capacity of 4 mol of CO2(g) and 4 mol of H2O(g), using CCO2(g) = 37.1 J K-1 mol-1 and CH2O(g) = 33.6 J K-1 mol-1. C = J K-1 (c) When this reaction is carried out in an open flame, almost all the heat produced in part (a) goes to raise the temperature of the products. Assuming that the reactants are at 25°C, calculate the maximum flame temperature that is attainable in an open flame burning cyclobutane in oxygen. The actual flame temperature would be lower than this because heat is lost to the surroundings. Maximum temperature = °C
Answer:
a
[tex]\Delta H^o _{rxn} = -2568.9 \ kJ [/tex]
b
[tex]H = 350 JK^{-1}[/tex]
c
[tex]T_{max} = 32.4 ^o C[/tex]
Explanation:
From the question we are told that
The reaction of cyclobutane and oxygen is
[tex]C_4H_8_{(g)} + 6 O_2_{(g)} \to 4 CO_2_{(g)} + 4 H_2O_{(g)}[/tex]
ΔH°f (kJ mol-1) : C4H8(g) = 27.7 ; CO2(g) = -393.5 ; H2O(g) = -241.8 ΔH° = kJ
Generally ΔH° for this reaction is mathematically represented as
[tex]\Delta H^o _{rxn} = [[4 * \Delta H^o_f (CO_2_{(g)} ) + 4 * \Delta H^o_f(H_2O_{(g)} ] -[\Delta H^o_f (C_2H_6_{(g)} + 6 * \Delta H^o_f (O_2_{(g)}) ] ][/tex]
=> [tex]\Delta H^o _{rxn} = [[4 * (-393.5) + 4 * (-241.8) ] -[ 27.7 + 6 * 0][/tex]
=> [tex]\Delta H^o _{rxn} = -2568.9 \ kJ [/tex]
Generally the total heat capacity of 4 mol of CO2(g) and 4 mol of H2O(g), using CCO2(g) = 37.1 J K-1 mol-1 and CH2O(g) = 33.6 J K-1 mol-1. C = J K-1 is mathematically represented as
[tex]H = [ 4 * C_{CO_2_{(g)}} + 6* C_{CH_2O_{(g)}}][/tex]
=> [tex]H = [ 4 * 37.1 + 6* 33.6 ][/tex]
=> [tex]H = 350 JK^{-1}[/tex]
From the question the initial temperature of reactant is [tex]T_i = 25^oC[/tex]
Generally the enthalpy change([tex]\Delta H^o _{rxn}[/tex]) of the reaction is mathematically represented as
[tex]|\Delta H^o _{rxn} |= H * (T_{max} -T_i)[/tex]
[tex] 2568.9 = 350 * (T_{max} -25)[/tex]
=> [tex]\frac{2568.9 }{350} = T_{max} - 25[/tex]
=> [tex]T_{max} = 32.4 ^o C[/tex]
convert each into decimal form.
a) 1.56× 10^3
b) 0.56×10-4
Answer: A = 1560
B = 1.6
Explanation: brainlest please
