Answer:
0.46 J/g degrees C, Iron
Explanation:
16.1 J = 5 g x c x 7 degrees C
c = 16.1 / 5 x 7 = 0.46
Answer: 0.46 J/g degrees C, Iron
what is a pure substance?
Answer:
A pure substance is a substance or an element whose impurities are extracted by concentration by chemical means.
e.g Aluminium is made pure by concentration of it's ore, bauxite by treatment with excess Sodium Hydroxide solution.
How many grams is 2.40 x 1023 molecules of N,O,? (5 pts)
PLS HELP ASAP
Answer:
30.26 grams of N₂O₃
Explanation:
Divide by Avogadro's number. This leaves you with the number of moles. Then, multiply by the molar mass of N₂O₃
The process by which sand is formed from rocks are...
Question 1 options:
melting and cooling
compaction and cementation
heat and pressure
weathering and erosion
Answer:
weathering and erosion
Explanation:
Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.
Answer:
weathering and erosion
Which substance is the BEST example of a compound?
Orange Juice
Salt Water
Hydrogen
Water
Answer:
I think hydrogen because Hydrogen combined with one atom with oxygen and in hydrogen peroxide. It has two atoms of hydrogen and 2 atoms of oxygen. Therfore it should be a compound.
A 5.0-g sample of Substance X increases in temperature from 20.0°C to 22.0°C when it absorbs 9.6J of heat. What is the specific heat of
Substance X in J/g °C)?
Answer:
0.96 J/g °C
General Formulas and Concepts:
Thermochemistry
Specific Heat Formula: q = mcΔT
m is mass (in grams)c is specific heat (in J/g °C)ΔT is change in temperature, final - initial (in °C)Explanation:
Step 1: Define
[Given] m = 5.0 g
[Given] ΔT = 22.0 °C - 20.0 °C = 2.0 °C
[Given] q = 9.6 J
[Solve] c
Step 2: Solve for c
Substitute in variables [Specific Heat Formula]: 9.6 J = (5.0 g)c(2.0 °C)[Specific Heat] Multiply: 9.6 J = (10. g °C)c[Specific Heat] Isolate c: 0.96 J/g °C = c[Specific Heat] Rewrite: c = 0.96 J/g °CWhich of the following metals would be the best to choose for making jewellery? Aluminium, iron, copper or gold?
Answer:
Of course the answer is gold
Explanation:
Gold is used for making jewellery and not aluminium,iron or copper
Answer:
copper or gold.
Explanation:
Copper is also a good material for accessories. Even in the ancient times, those who can’t afford gold jewelry wear copper jewelry instead. It offers design flexibility too due to its high ductility.
Please help with this
1. What is the molar mass of sodium?
11
O
45.90
23
О
16
Answer:
11
Explanation:
Sodium is a chemical element with the symbol Na and atomic number 11.
Answer:
22.99g/mol (in this case 23g/mol)
why is the absolute dating of rocks important?
Answer:
The dating of rocks is important because:
Explanation:
its important to know how the rocks have changed.
In a redox reaction,
the oxidizing agent undergoes oxidation
the reducing agent undergoes reduction
the oxidizing agents undergoes reduction
O the oxidizing agent loses electrons
Answer:
the oxidizing agent undergoes oxidation and
the reducing agent undergoes reduction simultaneously
Please help me
Calculate the pH of a 7.75x10^-12 M Hydrobromic acid solution. Ph=______(round to 4sig figs). The solution is?________(acidic/basic)
Answer:
pH = 6.999
The solution is acidic.
Explanation:
HBr is a strong acid, a very strong one.
In water, this acid is totally dissociated.
HBr + H₂O → H₃O⁺ + Br⁻
We can think pH, as - log 7.75×10⁻¹² but this is 11.1
acid pH can't never be higher than 7.
We apply the charge balance:
[H⁺] = [Br⁻] + [OH⁻]
All the protons come from the bromide and the OH⁻ that come from water.
We can also think [OH⁻] = Kw / [H⁺] so:
[H⁺] = [Br⁻] + Kw / [H⁺]
Now, our unknown is [H⁺]
[H⁺] = 7.75×10⁻¹² + 1×10⁻¹⁴ / [H⁺]
[H⁺] = (7.75×10⁻¹² [H⁺] + 1×10⁻¹⁴) / [H⁺]
This is quadratic equation: [H⁺]² - 7.75×10⁻¹² [H⁺] - 1×10⁻¹⁴
a = 1 ; b = - 7.75×10⁻¹² ; c = -1×10⁻¹⁴
(-b +- √(b² - 4ac) / (2a)
[H⁺] = 1.000038751×10⁻⁷
- log [H⁺] = pH → 6.999
A very strong acid as HBr, in this case, it is so diluted that its pH is almost neutral.
What causes polar bonds
Answer:
Bonds are polar when one element in a compound is more electronegative than the other. This creates a dipole in the molecule where one end of the molecule is partially positive and one end is partially negative
Explanation:
please help :( this is for science.
Science please help. I will add you and please don’t give me any random websites
Answer:
C
Explanation:
Answer:
D)
Explanation:
On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle.
Help please!!! I'll name you brainliest!!
Answer: pls mark brainliest
Explanation: i think so its D
How many atoms are contained in 12.8 g of Beryllium?
A9.0 atoms
B9.0 x 10 23 atoms
C8.55 atoms
D8.55 x 1023 atoms
Answer:
a atoms
Explanation:
Answer:
C. 8.55 atoms
Explanation:
Based on Reference Table F, which salt is the strongest electrolyte?
1.
CaCO3
2.
Na2SO4
3.
AgCI
4.
Zn3(PO4)2
Answer:
Na2SO4
Explanation:
Na2SO4 dissociates completely in solution to yield ions therefore it is the strongest electrolyte.
The question is incomplete as the table is missing but I will try to explain as generally as possible. Recall that an electrolyte is a compound that conducts electricity in solution.
Also recall that the number of ions available in solution determines the electrolytic strength of a substance. Hence, Na2SO4 dissociates completely in solution to yield ions therefore it is the strongest electrolyte.
Learn more about electrolytes: https://brainly.com/question/1301963
B.Use the words inside the box to complete the chart below
Answer:
Answered below
Explanation:
>> ice is solid
>> water is liquid
>> Steam is gas
>> Ice → water = melting
>> water → steam = evaporation
>> steam → water = condensation
>> water → ice = freezing
Name the following carboxylic
acid:
COOH
A. 1-methylpentanoic acid
B. 2-methylpentanoic acid
C. 1-methylbutanoic acid
D. 5-ethylpentanoic acid
Answer:
methylpentanoic acid,,,,,I guess so
The following carboxylic acid is 2-methylpentanoic acid.
What is a carboxylic acid?A carboxylic acid is an organic compound that contains the carboxyl functional group. The general formula for a carboxylic acid can be abbreviated as R−COOH.
Pentanoic acid can be prepared by reacting a butyl halide with magnesium to obtain a Grignard reagent, which is further reacted with carbon dioxide to give valeric salt.
Hence, the following carboxylic acid is 2-methylpentanoic acid.
Learn more about the carboxylic acid here:
https://brainly.com/question/26855500
#SPJ2
Nuclear changes differ from normal chemical changes in that all nuclear changes
Answer:
(1) Nuclear reactions entail a transition in the nucleus of an atom, which normally results in the formation of a new substance. Chemical reactions, on the other hand, only involve electron rearrangement and do not involve nuclei modifications. (4) Nuclear reactions are unaffected by the element's chemical form.
Explanation:
Hope this helps!
Please mark me as Brainlinieast.
Chromatogram results are considered to have better resolution if the RF values of the components being separated or further apart rather than closer together
Answer:
False
Explanation:
False : It is better they are closer together
The RF ( retention factor ) is calculated with this formula
= distance travelled / distance travelled by solvent
And the larger the RF factor of a compound the less polar the compound ( i.e. it will not stick to the stationary phase ) hence it is better the RF values of the components to be closer
Answer:
True
Explanation:
The resulting Rf factor, which has no units, is dependent upon the specific stationary and mobile phase used. Chromatogram results are considered to have better resolution if the Rf values of the components being separated are farther apart (e.g. 0.3 and 0.7) rather than closer together (e.g. 0.4 and 0.5). The distance the compound moves relative to the distance the solvent (or mobile phase or eluent) moves is a characteristic of that compound. (where Rf is equal to distance compound moved divided by solvent front distance)
A buffer solution is prepared by adding NaH2PO4
to a solution of H3PO4 (phosphoric acid).
H3PO4(aq) = H+ (aq) + H2PO4 - (aq)
What happens if HCl is added?
In the case when the HCI should be added so it should be shifted to reactants.
What is a buffer solution?It is the solution that should be considered as the aqueous solution that comprise of the mixture of the weak acid and the conjugate base.
Here the ph level should be change very less at the time when the small amount of the strong acid should be added.
Therefore, it should be shifted to reactants.
Learn more about solution here: https://brainly.com/question/20856989
10. What is the Kinetic Energy of a 100 kg object that is moving with a speed of 13.5 m/s?
Answer:
[tex]100 \times 13.5 = ikw n bahaa[/tex]
IKAW na mag tayms
When the air near the surface is heated, it rises, taking heat with it. The type of energy transfer involved here is what?
How do I balance
H2O ⇾ H2 + O2
help help help help help help help help
1. What is an action citizen can take to prevent energy waste?
Answer:Switch off lighting in refrigeration areas when not in use?
Explanation:
Marble is made from limestone under the influence of heat and pressure. The chemical formula for limestone or marble
chips is CaCO3. When you added the chips to the acid solutions, they effervesced (bubble or foam).
1. What is the gas that is produced?
2. What is the chemical formula of the gas?
3. How could you test rocks for the presence of limestone?
4. Write a balanced symbol model for the reaction of limestone with hydrochloric acid.
Answer:
what is the gas that is produced.
30 point. What is formed when a hydroxyl group is substituted for a hydrogen?
Answer:
alcohol
Explanation:
What is the percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it?
Answer: The percent by mass concentration is 33.3 %
Explanation:
Mass percent is the ratio of mass of solute to the mass of solution in terms of percentage.
mass of solute = 50 g
mass of solution = [tex]{\text {density of solution}}\times {\text {volume of solution}}=1.5g/ml\times 1000ml=1500g[/tex]
Mass percentage = [tex]\frac{50g}{1500g}\times 100\%=33.3\%[/tex]
Thus percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it is 33.3 %
One major problem with wind and solar energy is that they are conditional. Explain how hydroelectric pumped storage could be used to eliminate this
obstacle? *
Link to the article https://thinkprogress.org/the-inside story-of-the-worlds-biggest-battery-and-the-future-of-renewable-energy-8984c81283c/
Answer:
Hydroelectric pumped storage can be used to eliminate the conditional nature of wind and solar energy. At times of peak production of energy from either solar or wind (during summer and windy days), the excess electrical energy produced can be stored using hydroelectric pumped storage methods. When conditions no longer favour energy production from either wind or solar sources, these stored energy can then be regenerated for use.
Explanation:
Pumped-storage hydroelectricity is a type of hydroelectric energy storage used by electric power systems to store excess electrical power during periods of low demand for later release at periods when demand for energy rises again. It stores energy in the form of gravitational potential energy of water, pumped from a lower level reservoir to a higher level reservoir.
At times of low electrical demand, excess generated energy is used to pump water into the upper reservoir. When there is higher demand, water is released back into the lower reservoir through a turbine, generating electricity.
This form of energy storage is useful in circumventing the conditional nature of renewable energy sources such as wind and solar energy. At times of peak production of energy from either solar or wind (during summer and windy days), the excess electrical energy produced can be stored using hydroelectric pumped storage methods. When conditions no longer favour energy production from either wind or solar sources, these stored energy can then be regenerated for use.
