what is the next step if a scientist's hypothesis is supported
How many grams are 4.78x10*21 atoms of aluminum?
A student trying to determine if a liquid was a mixture or a pure substance made several following observations. Which observation would best support the conclusion that the liquid was a mixture?
Answer:
Distillation
Explanation:
By using the method of distillation we'll identify if there is other properties of liquid by looking the temperatures,the ordor or the boiling point.
is sugar an element or a compound
Answer:
it is a compound
Explanation: i have it on a test
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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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
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
The is the
variable that
gets measured
Answer:
what? what's the full question?
helpppp in a chemical equation, in which direction does the "yields" arrow point, and what factor does it indicate?
It points to the left, toward the reactants.
It points to the left, toward the products.
It points to the right, toward the reactants.
It points to the right, toward the products.
Answer:
It points right, towards the reactants
Explanation:
In a chemical equation, the arrow indicating the yield is to the right towards the arrow. The reactants are written in the left side and the product are written in the right side.
What is a chemical equation?A chemical equation represents the reaction between two or more elements or compound. The reaction describes the chemical combination between atoms.
A general chemical equation representing a chemical reaction is written below:
A + B ⇒ C.
Here, A and B are reactants and C be the product.
The yield of a reaction is the amount of product obtained. The theoretical yield might differ from the actual yield. Therefore, the arrow of a reaction points to the right towards products.
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How can you use the periodic table to predict reactivity?
Giving Brainliest!!!
Answer:
hi
Explanation:
how r u today
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
What do metalloids and non metals have in common
Answer:
Metalloids are brittle like Non-Metals
Explanation:
All living things must maintain stable body conditions (homeostasis).
A. True
B. False
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
Write out a balanced, molecular equation, total ionic equation, and net ionic equation for each:
1. Mg(NO3)2(aq) + Na2CO3(aq) -->
2. AgNO3(aq) + KCl(aq) -->
3. Al(s) + HCl(aq) -->
4. HNO3(aq) + Na2CO3aq) -->
Answer:
1:MgCO3 (s) + 2 NaNO3
2:agcl(s)+kno3(aq)
3:alcl3(aq)+h2(g)
4:NaNO3 + CO2 + H2O
(not sure abt last one)
 what is 19.8-17.1
Answer: it should be 2.8
Explanation:
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:
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 ☺️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:
what is the formula for titanium (IV) sulfate
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.
convert each into decimal form.
a) 1.56× 10^3
b) 0.56×10-4
Answer: A = 1560
B = 1.6
Explanation: brainlest please
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%
A fireworks designer is planning a red-, white-, and blue-themed finale for her fireworks display. She is also planning a fountain effect. Describe the chemicals she will need and how each will produce the desired effect.
Answer:
strontium salts, lithium salts, lithium carbonate, Li2 CO3 = red, whitehot metal, such as magnesium or aluminum, barium oxide, BaO = white, copper compounds + chlorine producer, copper acetoarsenite (Paris Green), Cu3 As2 O3 Cu(C2 H3 O2 )2 = blue. We will need a metal chemical, so that when it is heated it will produce the incandescent to make the fountain effect.
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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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.
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.
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:
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
