Answer: 35.078 to 3 significant figures
Explanation:
Solving;
34.56 + 42.235 * 0.0123 - 0.001
We solve the multiplication first according to the BODMAS rule.
So,
42.235 * 0.0123 = 0.51949
Doing the addition,
34.56 + 0.51949 - 0.001
This gives;
35.079 - 0.001
And finally the subtraction gives;
= 35.078
1. Cierta muestra fue diluida así: 1 mL MP se agrega 4mL de agua, luego se extrae 0,5 mL y se lleva a 5 mL y de esta última se obtiene 0,2 y se añade 1,3 de diluyente. Calcule la dilución total.
Answer:
1/375
Explanation:
Primero se debe calcular el factor de dilución para cada dilución seriada. Para ello, se divide el volumen de muestra entre el volumen final de la solución diluida.
1) 1 mL en 1 mL + 4 mL = 5 mL
D1 = 1 mL/5 mL = 1/5
2) 0,5 mL en 5 mL
D2 = 0,5 mL/5 mL = 1/10
3) 0,2 mL en 0,2 mL + 1,3 mL = 1,5 mL
D3 = 0,2 mL/1,5 mL = 2/15
La dilución total se calcula como el producto de las diluciones seriadas realizadas:
DT = D1 x D2 x D3 = 1/5 x 1/10 x 2/15 = 1/375
The Moon only emits light at night.
True
False - does not emit light at all
Answer:
It's trueeeeeee:))))))
Answer:
TRUE
Explanation:
How many molecules of water are there in 10 lbs of water?
55.556
Explanation:
or something like that
Match these items.
No links please!
Definitions:
1. Built the first American A.C. generator.
2. Found a relationship between electricity and magnetism.
3. Associated with gas and oil.
4. First workable electric light bulb.
5. Developed the equations E=mc^2
6. Provides majority of the energy in the United States.
7. Splitting heavy atoms
8. Produces plutonium
9. Powered by falling water or stream pressure
10. Thin silicon slices
11. Using heat from the earth
Term names:
a. Oersted
b. Geothermal
c. Edison
d. Einstein
e. Salt dome
f. Turbine
g. Fission
h. Westinghouse
i. Solar cells
j. Gas and oil
k. Breeder
[tex]\huge{\mathbb{\tt { QUESTION↓}}}[/tex]
1. Built the first American A.C. generator.
2. Found a relationship between electricity and magnetism.
3. Associated with gas and oil.
4. First workable electric light bulb.
5. Developed the equations E=mc^2
6. Provides majority of the energy in the United States.
7. Splitting heavy atoms
8. Produces plutonium
9. Powered by falling water or stream pressure
10. Thin silicon slices
11. Using heat from the earth
[tex]\huge{\mathbb{\tt {ANSWER↓}}}[/tex]
[tex]\color{black}{\tt {1.) \: h. \: Westing \: house}}[/tex]
Built the first American A.C. generator[tex]\color{black}{\tt {2.) \: Oersted}}[/tex]
Hans Christian Oersted discovered the relationship between electricity and magnetism in 1820.[tex]\color{black}{\tt {3.) \: j. Gas \: and \: oil}}[/tex]
Associated gas refers to the natural gas found in association with oil within the reservoir. There are also reservoirs that contain only natural gas and no oil, this gas is termed non-associated gas.[tex]\color{black}{\tt {4.) \: c.Edison}}[/tex]
By January 1879, at his laboratory in Menlo Park, New Jersey, Edison had built his first high resistance, incandescent electric light. It worked by passing electricity through a thin platinum filament in the glass vacuum bulb, which delayed the filament from melting. Still, the lamp only burned for a few short hours.[tex]\color{black}{\tt { 5.) \: d. Einstein}}[/tex]
E = mc2, equation in German-born physicist Albert Einstein's theory of special relativity that expresses the fact that mass and energy are the same physical entity and can be changed into each other.[tex]\color{black}{\tt {6.)i.solar cells}}[/tex]
Energy Sources in the United StatesPetroleum (crude oil and natural gas plant liquids): 28% Coal: 17.8% Renewable energy: 12.7% Nuclear electric power: 9.6%"[tex]\color{black}{\tt { 7.) \: g. fission}}[/tex]
Nuclear fission is a process by which the nucleus of an atom is split into two or more smaller nuclei, known as fission products. The fission of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process.[tex]\color{black}{\tt { 8.) Sorry \: but \: I \: don't \: know \: the \: answer}}[/tex]
[tex]\color{black}{\tt { 9.) Sorry \: but \: i \: don't \: know \: the \: answer}}[/tex]
[tex]\color{black}{\tt { 10. ) \: Sorry \: \: But \: I \: don't \: know \: the \: answer }} [/tex]
[tex]\color{black}{\tt {11.) \: b. Geothermal}}[/tex]
Geothermal/GSHP systems take advantage of nature's underground temperatures by exchanging heat with the earth using an underground network of water (or refrigerant) filled pipes. In the winter, the liquid pulls heat from the ground and transfers it to the house through an exchanger.#CarryOnLearning
#LetsEnjoyTheSummer
→XxKim02xXIf an atom has 7 valence electrons, what will its charge be when it becomes an ion?
Answer:
Well, he needs to take one more electron to have a stable structure. And by doing that the atom will have more electrons than protons and will turn into a negative ion.
1. The electron arrangement ions X and Y2 are 2, 8, and 2, 8, 8 respectively.
Write the electronic arrangement of the elements X and Y. (2 mks)
Write the formula of the compound that would be formed between X and Y.
a
mk)
The given question is incomplete. the complete question is:
The electron arrangement ions [tex]X^{3+}[/tex] and [tex]Y^{2-}[/tex] are 2, 8, and 2, 8, 8 respectively.
Write the electronic arrangement of the elements X and Y.
Write the formula of the compound that would be formed between X and Y.
Answer: 1. The electronic arrangement for X and Y are 2,8, 3 and 2,8,5 respectively.
The formula of the compound formed is [tex]X_2Y_3[/tex]
Explanation:
Electronic configuration is the arangement of electrons in an atom in order of increasing energies.
Cations are formed when electrons are lost by atoms and anions are formed when electrons are gained by atoms.
[tex]X^{3+}:2,8[/tex]
[tex]X:2,8,3[/tex]
[tex]Y^{3-}:2,8,8[/tex]
[tex]Y:2,8,5[/tex]
For formation of a neutral ionic compound, the charges on cation and anion must be balanced.
Here element X is having an oxidation state of +3 called as [tex]X^{3+}[/tex] cation and [tex]Y^{2-}[/tex] is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]X_2Y_3[/tex]
Earth is currently 150 million km away from the Sun. If Earth was 200 million km away from the Sun, why would it no longer be able to support life?
Answer:
The temperature would be too cold
Explanation:
A gas has an initial volume of 15 L. If the temperature increases from 330 K to 450 K, what is the new volume.
Answer:
20.(45)L or about 20.4545L
Explanation:
PV = nRT
Where:
P - pressure
V - volume
n - number of particle moles
R - a constant
T - temperature in K
We can assume the P and n (and definitely R) stay the same, so we infer that
[tex]V_1 = \frac{nRT_1}{P} = 15L\\V_2 = \frac{nRT_2}{P}\\V_1 / V_2 = \frac{nRT_1}{P} / \frac{nRT_2}{P} = \frac{T_1}{T_2}\\\\15L / V_2 = \frac{330K}{450K} = \frac{11}{15}\\\\V_2 = 15L \cdot \frac{15}{11} = 20.(45)L[/tex]
A 3.4 g sample of an unknown monoprotic organic acid composed of C,H, and O is burned in air to produce 8.58 grams of carbon dioxide and 1.50 grams of water vapor. It was also determined that 279 mL of 0.1 M KOH was needed to titrate the acid completely.
Answer:
[tex]C_7H_6O_2[/tex]
Explanation:
Hello there!
In this case, we can divide the problem in three stages: (1) determine the empirical formula with the combustion analysis, (2) compute the molar mass of acid via the moles of the acid in the neutralization and (3) determine the molecular formula.
(1) In this case, since 8.58 g of carbon dioxide are released, we can first compute the moles of carbon in the compound:
[tex]n_C=8.58gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.195molC[/tex]
And the moles of hydrogen due to the produced 1.50 grams of water:
[tex]n_H=1.50gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{2molH}{1molH_2O} =0.166molH[/tex]
Next, to compute the mass and moles of oxygen, we need to use the initial 3.4 g of the acid:
[tex]m_O=3.4g-0.195molC*\frac{12.01gC}{1molC}-0.166molH*\frac{1.01gH}{1molH} =0.89gO\\\\n_O=0.89gO*\frac{1molO}{16.0gO}=0.0556molO[/tex]
Thus, the subscripts in the empirical formula are:
[tex]C=\frac{0.195}{0.0556}=3.5 \\\\H=\frac{0.166}{0.0556}=3\\\\O=\frac{0.0556}{0.0556}=1\\\\C_7H_6O_2[/tex]
As they cannot be fractions.
(2) In this case, since the acid is monoprotic, we can compute the moles by multiplying the concentration and volume of KOH:
[tex]n_{KOH}=0.279L*0.1mol/L\\\\n_{KOH}=0.0279mol[/tex]
Which are equal to the moles of the acid:
[tex]n_{acid}=0.0279mol[/tex]
And the molar mass:
[tex]MM_{acid}=\frac{3.4g}{0.0279mol} =121.86g/mol[/tex]
(3) Finally, since the molar mass of the empirical formula is:
7*12.01 + 6*1.01 + 2*16.00 = 122.13 g/mol
Thus, since the ratio of molar masses is 122.86/122.13 = 1, we infer that the empirical formula equals the molecular one:
[tex]C_7H_6O_2[/tex]
Best regards!
Which layer of the sun is shown extending into space in the picture above?
Answer:
Corona
Explanation:
The outermost layer of the sun's atmosphere is called the corona, meaning “crown.” The corona is formed of thin wisps of gas that extend outward into space for millions of miles. It is much less bright than the photosphere, so we can only see it if the rest of the sun is blotted out, for example during a solar eclipse.
1. Which of the following would not be a good way to describe a body system?
A. Body systems are like computer programs that have to communicate with each
other in order to make the computer work.
B. Body systems are like runners in a marathon who each run alone and don't need the
other runners to finish the race.
C. Body systems are like machines with many different moving parts.
D. Body systems are like individual parts of one big story.
Answer:
the answer would be b
Explanation:
the body sytsem needs to depend on eah other in order to work
Body systems are like runners in a marathon, who each run alone and don't need the other runners to finish the race, is not a good way to describe a body system, hence option B is correct.
How body systems work together?Your digestive tract takes nutrients and water from the food you eat in to your body. The body's cells receive oxygen, water, and nutrients through your circulatory system.
Your skin, excretory system, and respiratory system all function to remove wastes from your cells.
Your body's many systems depend on one another to function properly. While your heart's muscles require oxygen from your lungs to beat, your respiratory system depends on your circulatory system to distribute the oxygen it collects.
Therefore, option B is correct.
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What is the value that is MEASURED in a lab?
Answer:
To use standard laboratory measurement devices to measure length, volume and mass amounts.
Why must the mass of reactants in a chemical reaction
always equal the mass of products?
Answer:
law of conservation
Explanation:
matter cannot be destroyed nor made
1. What is the symbol for atomic mass? What are the units of atomic mass in terms of atoms? 2. What is the symbol for molar mass? What are the units of molar mass? 3. What is the atomic mass of iron, with units? 4. What is the molar mass of iron, with units? 5. What is formula mass? What are the units of formula mass? 6. What is the formula mass of sodium bicarbonate, with units? 7. What is the molar mass of sodium bicarbonate with units? 8. What is the molar mass of water? 9. What is the molar mass of ammonia, NH3? 10. What is the molar mass of lithium oxide? 11. What is the molar mass magnesium bicarbonate? 12. What is the molar mass of cobalt(III) carbonate?
i am NOT gonna read all of that
What is the answer to this?
the answer is A.
the scientist used mud and vinegar to make a model of the volcano.
How many Zn atoms are there in 4.65 moles of Zn?
atoms
Submit Answer
Retry Entire Group
9 more gra
A form of energy that is related to its temperature...
nuclear energy
thermal energy
potential energy
kinetic energy
Answer:
Kinetic Energy
Explanation:
Temperature and Kinetic Energy are directly proportional.
4. Calculate the heat energy needed to heat 25.0 g of water from 13.0°C to 18.0°C. Use chart above for specific heat of water. Use units and show all work.
Answer: I go search some information
Explanation:I come back with a answer
does anyone know this please?
Answer:
1.) b
2.) c
3.) e
4.) g
5.) j
6.) k
HOPE THIS HELPS
-Todo <3
Explanation:
Answer:B, C, F, G, I, L.
Explanation: i think that these are the correct one there was not a whole lot of contects on the question
Need help on science ASAP
Answer:
3
Explanation:
The plates are moving away from each other
What conversion factor will help solve the problem?
2HgO → 2Hg + O2
How many moles of mercury (II) oxide are needed to make 125 grams of O2
125 g O2 x ___1 mol__O2 x ____________ = mols HgO
32.00 g O2
a
2 mol Hg
1 mol O2
b
216.6 g HgO
1 mol HgO
c
1 mol O2
2 mol HgO
d
2 mol HgO
1 mol O2
Answer:
i fond nothing sooory
pic so PC
NaOH + HCI → NaCl + H20
*double replacement
*single replacement
*synthesis
*combustion
Answer: a double replacement
Explanation:
I used a stick of (vegan) butter as our example of thinking about how temperature changes the properties of something when it is wamer or cooler.
1. What is something else you could use to describe how temperature affects the properties of when it is warmer or cooler? How does this change whether it is warm or cold. Describe it.
(True or false) The blood carries hormones to target tissues around the body so the hormones can control the activity of those cells
Answer:
True
Explanation:
Answer:
True
Explanation:
Hormones are chemical messengers secreted into blood or extracellular fluid by one cell that affect the functioning of other cells. Most hormones circulate in blood, coming into contact with essentially all cells. However, a given hormone usually affects only a limited number of cells, which are called target cells.
define the term pure substance
Answer:
Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure. Pure substances are further classified as elements and compounds. An element is a substance that consists of only one type or kind of atom
Answer:
define the term pure substance :
A pure substance does not have to be of a single element or compound, This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties
Explanation:
consider the following reaction: 2Al + 6HBr --> 2AlBr3 + 3H2
A) when 3.22 miles of Al reacts with 4.96 miles of HBr3, how many moles of H2 are formed
B) what is the limiting reactant
i find the answer in (Limiting Reactants and Excess ws_KEY.pdf)
make a search for it it's the first link
According to stoichiometry and balanced chemical equation, 6.18 moles of hydrogen are formed and HBr is the limiting reactant.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is used in balancing chemical equations.
In the given chemical reaction,when 3.22 moles of Al reacts with 4.96 moles of HBr₃ total of 3.22+4.96= 8.18 moles are formed.Out of which according to reaction of which 6 moles are of hydrogen so thus,to find moles of hydrogen formed 8.18-2=6.18 moles of hydrogen are formed.
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How are the testes and the ovaries similar?
They are part of the human skeleton.
They are reproductive organs.
They are sensory organs.
They produce sperm.
Hello, I need help in this part of chemistry, I need the chemical names of the following four:
1) B and F3
2) Se and I2
3) As2 and Se3
ASAP! Please,,,
Why the colloid can't be filitred?Write it's 4 examples.
Answer:
Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter.
ex- cheese, milk, aerosol spray, mayonnaise
Y’all I need help ASAP
What are the correct numbers to balance this equation......?
__NaCI2+__Col2——> __Nal2+__CoCI2
Answers:
1)not possible to balance
2) 2...2—>...2...2
3) 3...3—>...3...3
4)it’s already balanced.
Answer:
yes it is already balanced
just a tricky question!!
Explanation: