Answer:skin cream
Explanation:
the independent variable is the variable that is always changed or manipulated. in this case the skin cream is the independent variable.
Is it correct or wrong
Answer:
i think correct
Explanation:
i am not sure but i hope it will help you
Write an ionic equation for oxygen reacting with water to form hydroxide ions at the cathode
Explanation:
oxygen (O)will react with water(H2O) to form hydroxide which is (OH
i need help with this
Answer:
1. The graph is showing the monthly rainfall between April to July.
2. The month is on the X axis.
3. The inches of the monthly rainfall is on the Y axis.
Calculate the no. of moles in 25gm of calcium phosphate
Plz Fast Urgent
Answer:
0.162 mol
Explanation:
n=m/M
M= 20*3 + 15*2 + 8*4*2
M=154 g/mol
n=25g/154g/mol
n=0.162 mol
The number of moles in 25 grams of calcium phosphate is 0.162 mol.
What are moles?Mole is a SI unit that is used to measure the quantity of any substance in a specific amount. To calculate the moles, we will divide the mass of the substance by the molar mass of that substance.
n = m/M
Calcium phosphate is a chemical compound that contains calcium and phosphorus or phosphoric acid, and it is used to treat the low calcium in the body and thyroid and parathyroid.
The molar mass of calcium sulfate is 154 g/mol
The mass of calcium sulfate is 25 grams
Putting the value in the equation
n = m/M
n = 25g / 154 g/mol = 0.162 mol
Thus, the moles of calcium sulfate are 0.162 mol.
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A catalyst that has a different phase than the reactants is a(n) _______. A. exergonic catalyst B. endergonic catalyst C. homogeneous catalyst D. heterogeneous catalyst E. autocatalyst
Answer: Heterogeneous Catalyst
Explanation: The word heterogeneous means "different phases" or insoluble in science.
Read the information in the table below:
Reaction
Description Energy to IS break bonds is more tha renergy release to form bonds Energy to break bonds is less than energy release to form bonds
Which type of reaction is represented by B?
Answer: Exothermic
Explanation: The energy of the reactants is leass than that of the products. Conservation of energy means that the excess is given off, or exothermic.
How would you calculate the density of an object?
mass/volume
mass * volume
mass/area
weight/mass
Answer:
Mass/Volume
Explanation:
Answer:
[tex]{ \sf{density = \frac{mass}{volume} }}[/tex]
How do double replacement reactions relate to Combustion reactions
Explanation:
A single-replacement reaction replaces one element for another in a compound.
A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds.
A precipitation reaction is a double-replacement reaction in which one product is a solid precipitate.
Solubility rules are used to predict whether some double-replacement reactions will occur.
Iron is a type of metal that has a shiny surface. However, iron can rust easily. Explain
Answer:
Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. ... Both oxygen and moisture are catalysts for rusting.
Answer:
Iron rusts because of of a chemical reaction known as oxidation. During the chemical reaction iron is converted to iron oxide, if it is left unaddressed, the iron oxide will spread, thereby jeopardizing the physical integrity of the iron.
Adding the number of protons to the number of neutrons determines what about the atom?
A
the atomic number
B
the atomic mass
(Hint: protons + neutrons = ?)
2. What evidence is there that green ink is a mixture?
Answer:
The fact that the green ink separated from the rubbing alcohol proves that it is indeed a mixture.
What is the process in which matter changes from the liquid to the solid state?
A. melting
B. freezing
C. boiling
D. vaporizing
Answer:
freezing
Explanation:
hope it is helpful
Answer:
freezing. b.
Explanation:
Tyrone and Valerie wanted to determine what feature of a paper airplane would cause it to fly the farthest. Tyrone made his airplane with longer wings than Valerie's airplane. Valerie's airplane had shorter wings than Tyrone's. After testing the two airplanes several times, the data shows that wider wings help airplanes fly farther than shorter wings.
Which characteristic of science is missing from this experiment?
The question is not testable because paper airplanes are always changing.
The phenomenon is not observable because air resistance changes.
The experiment is not replicable because controlled variables are not included.
The results are not reliable because the airplanes were only tested one time.
The characteristic of science that is missing from this experiment is that "the results are not reliable because the airplanes were only tested one time".
Some of the characteristics of science include objectivity, verifiability , reliability, accuracy, observable, precision etc.
Based on the question asked, the results of the experiment are not reliable due to the fact that the the airplanes were only tested one time. The airplanes should have been tested multiple times to show that they are reliable.
In conclusion, the correct option is D.
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Answer:
D
Explanation:
Write the symbol of atoms as per John Dalton.
please tell fast
Answer:
In his 1805 work, "A New System of Chemical Philosophy," Dalton propounded the tenets of his atomic theory: The chemical elements are made of atoms. The atoms of an element are identical in mass. Atoms of different elements have different masses.
Hope it helps.... If yes mark me as brilliants
WHATS H2O??????????????
Answer:
Explanation:
water
H. 2. O is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms
How are elements arranged on the periodic table?
a. they are arranged to highlight similarities between elements
b. they are arranged to highlight different elements with similar isotopes
c. they are arranged in order from most abundant to very rare and unstable
d. they are arranged in order of the date of discovery
Answer:
the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom.In a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column.
The elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.
How elements are arranged on the periodic table?The elements on the periodic table are basically arranged on the basis of increasing their atomic number. These atomic number is represented by the number of protons in the nucleus of an element.
According to the question, the elements possessing identical chemical properties are arranged in the same group. For example, group 17 is known as the halogen group. Among this group, the elements bear one electron short to fulfill their octet.
The whole periodic table comprises of 18 groups and 7 periods.
Therefore, the elements on the periodic table are arranged on the basis of highlighting similarities between elements. Thus, the correct option for this question is A.
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calculate the mass of iron (iii) carbonate that will be formed when 15.0 mL of 0.15 M iron (iii) chloride solution are reacted with 20.0 mL of 0.15 M sodium carbonate. Be sure to write the balanced metathesis reaction that is occuring.
Answer:
The molar mass of a substance is calculated as the mass of a given chemical compound or substance, which is then divided by the amount of the substance. The mass is calculated in grams and the amount of the substance is calculated in mol. Thus, the standard unit for molar mass is g/mol.
Explanation:
According to the given question, the reaction between iron chloride and sodium carbonate will be given as:
[tex]\text {3Na_{2}CO_{3}\text} \;\[+\] \;\text{ 2FeCl_{3} \text}\; \rightarrow\; \text {6NaCl}\; \[+\] \;\text { Fe_{2} (CO_3)_{3} \text}[/tex]
Now, to calculate the mass of iron carbonate formed in the above chemical reaction, it will be given as:
[tex]{ \text Moles\;of}\text \;\text {FeCl_{3} \text} \[=\dfrac{0.15 \;\text {moles} \times 0.015\; \text L}{1.0 { \;\text L}\text}[/tex]
[tex]=\;0.00225\; \text {moles}\text[/tex]
Similarly, for sodium carbonate
[tex]\text Moles\; of\; Na_{2}CO_{3}}\te \[=\]\dfrac{0.15 \;\text {moles} \times 0.020\; \text L}{1.0 { \;\text L}\text}\\[/tex]
[tex]\[=\]\;0.0003\; {\text moles \text}[/tex]
Limiting reactant is [tex]\text {FeCl_{3} \text}[/tex]
Now, calculating iron chloride mass:
[tex]=\dfrac{0.00225 \times 1\;\text{moles}\;\text{Fe}_2 {(\text{CO}_3)}}{2\;\rm{moles\;of\;}Fecl_3}[/tex]
[tex]=0.001125 \;\text {moles }[/tex]
Now, molar mass of the [tex]\text{Fe}_{2}\text{CO}_{3}[/tex] will be [tex]=291.71679\;\text{g/ mol}[/tex]
[tex]\begin{aligned}\text{Mass}&=\frac{\text{Moles}}{\text{Molar mass}}\\\\&=\frac{0.001125\;\text{moles}}{291.71679\; \text{g/mol}} \\\\&=3.85648\times10^{-6} \end{aligned}[/tex]
MAY SOMEONE HELP ME PLZZ
A tire company wants to determine what kind of rubber will last the longest for their tires. What are some variables that the researchers will want to make controlled variables?
Answer: Rubber source, temperature, thinkness, thread design, driving pattenrs, weather, etc.
Explanation: There are many variables. Here are a few I would include in a tire lifetime study:
1. Type of rubber, including source
2. Thickness of tire
3. Design of tire thread
4. Life as a function of average speed and road surface
5. Expected outside temperature and wet conditions
6. Driving conditions of speed and both acceleration and deceleration parameters (e.g., tire life when slamming on the brakes or accelerating quickly)
11. What is the mass of the object in the picture below? The density is 0.789g/mL.
Hint: You will need to find the volume first!
Answer: 3.156 grams
Explanation: The additional volume is 4 ml. (0.789 g/ml)*(4 ml) = 3.156 grams
Help me,I’m so confused ..and explain pls
Answer:
1. is 50...
75/1.5 = 50
2. is 600...
300/5 is 600
3.
Part A: 45 minutes= 0.75 hours
Part B: 5.3
Explanation:
Don't agree? The calculator says other wise....
i checked it its correct.
20 point for right answer
Answer:The below file contains the answer
Explanation:
Water and carbon dioxide being converted to glucose
a
Chemical Change
b
Physical Change
Answer:
Chemical change
Explanation:
How long does S waves travel through earths crust
Answer:
For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.
IF HELPED MARK AS BRAINLIEST
Answer:
For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.
Evaporation of water off of the surface of leaves
a
Chemical Change
b
Physical Change
2. All organisms obtain and use
In order to live.
Answer:
Energy . ......
Hope this helps you!
The density of a substance is 1.63 grams per milliliter. What is the mass of 0.25 liters of the substance in grams?
Answer:
407.5 g
Explanation:
Hope it helps.
Drag the appropriate answer to the correct location on the concept map below.
Which of the following would electrolysis NOT be used for?
A. Producing electricity
B. Extracting reactive metals
C. Plating metals onto other metals
D. Producing hydrogen gas
Answer:
D
Explanation:
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Producing hydrogen gas. Hence, option D is correct.
What is electrolysis?Electrolysis is described by two half-reactions. These half reaction are the oxidation half-reaction and reduction half-reaction.
Electrolysis involves the transfer of electrons. Each half reaction is characterized by the loss or gain of electrons.
The only reason why producing hydrogen gas is not used most of the time is because electrolysis has very low efficiency, most of the energy finishes up being converted to heat and 95% of the hydrogen is produced by steam reforming.
Hence, option D is correct.
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1 Write the correct symbol, with both superscript and subscript,
for each of the following. Use the list of elements in the front
inside cover as needed: (a) the isotope of platinum that contains
118 neutrons, (b) the isotope of krypton with mass number 84,
(c) the isotope of arsenic with mass number 75, (d) the isotope of
magnesium that has an equal number of protons and neutrons.
Answer:
+27 66 514 3800
Explanation:
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i really need help please
Answer: its blank???
Explanation: