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Hi, I really need help, my mental health is horrible right now and I can’t do any work, and I really just need help answering these questions because I really don’t want to get bad marks but I don’t have the motivation to do anything, thanks so much!
How is a chemical equation different from a chemical formula?
Answer:
Explanation:
A chemical formula is the combination of atomic symbols that designate a particular chemical compound, or a substance with two or more different elements. The formula shows which type and how many of each element makes up that specific compound
An airplane travels 200 km/h in 4 hours going to Zambales. What will be the distance and displacement?
Answer:
See explanation
Explanation:
Recall that;
Speed = Distance/time
Distance = Speed * time
Speed = 200 km/h
Time = 4 hours
Distance = 200 km/h * 4 hours = 800 kilometres
Displacement has to do with distance covered in a specified direction, in this case, the direction is towards Zambales.
Hence, the displacement is 800 kilometres towards Zambales.
A 12 fluid ounce Coca-Cola contains 6.9*10^22 molecules of sugar (C12H22O11). How many grams of sugar are there in a coke?
Answer:
37.62 g
Explanation:
First we convert 6.9x10²² atoms of C₁₂H₂₂O₁₁ to moles, using Avogadro's number:
6.9x10²² atoms ÷ 6.023x10²³ atoms/mol = 0.11 molThen we convert moles of C₁₂H₂₂O₁₁ to grams, using its molar mass:
Molar mass of C₁₂H₂₂O₁₁ = (C molar mass)*12 + (H molar mass)*22 + (O molar mass)*11 = 342 g/mol
0.11 mol * 342 g/mol = 37.62 gPLEASE HELP: What are the reactants?
Answer:
Reactants are substances that start a chemical reaction, and products are substances that are produced in the reaction
Explanation:
Hope This Helps
In molecular oxygen (O=O) which atom is partially positive?
the oxygen atom
Explanation:
Water is a molecular compound consisting of polar molecules that have a bent shape. The oxygen atom acquires a partial negative charge while the hydrogen atom acquires a partial positive charge.
Answer:
Carbon
Explanation:
oxygen is more electronegative than carbon, the electrons will spend more time around the oxygen atom giving it a partially negative charge while the carbon will become partially positive. Some atoms retain lone (unbonded) pairs of electrons when they are part of a covalent complex.
sketch and label a helium-4 atom and helium-5 atom to include the protons, neutrons, and electrons. how are they alike and how are they different?
Answer:
Protons-2 for both
neutrons-2 for helium-4 and neutrons-3 for helium-5
electrons-1 for both
Explanation:
draw a ring and put protons and neutrons in the middle and the electrons on the ring
A compound that releases hydroxide ions in solution would most likely have which chemical property? 1.It would react with lipids to form soap. 2.It would react with metals to form a salt and water. 3.It would react with metals to form hydrogen gas. 4.It would react with carbonates to form carbon dioxide.
Answer:
1
Explanation: bases do not react with metals or carbonates
Answer:
A
Explanation:
I did the test and that's the correct answer
volume of 5.2 X 10^26 molecules of CH4
Answer:
19348.84 L
Explanation:
At STP, we know that;
6.02 × 10^(23) molecules = 22.4 L
Therefore, 5.2 × 10^(26) molecules = 5.2 × 10^(26) × 22.4/(6.02 × 10^(23)) = 19348.84 L
Thus, volume of CH4 with 5.2 X 10^26 molecules is 19348.84 L
The .......................................................... Is related to its tendency to give away electrons and form positive ions
Answer:
electropositivity or metallic character.
The ability of an atom to give away electrons and form positive ions i.e cations is known as electropositivity or metallic character.
What is the concentration in ppm of chloride in a solution made with 0.808 grams of CaCl2 and 250.0 ml of water?
Answer:
0.808 g x 1000 = 808 mg.
250 ml/1000 = 0.25 L.
808 mg/0.25 L= 3232 mg/L = ppm.
Hope this helps you. Do mark me as brainliest.
A solution has a concentration of 40 g.L-1
. We take 20 mL of this solution and add water. The
final volume is 40 mL. What's the new concentration? No calculations but you need to
justify
Answer: The new concentration is 20 g/L
Explanation:
According to the dilution law,
[tex]C_1V_1=C_2V_2[/tex]
where,
[tex]C_1[/tex] = concentration of stock solution = 40 g/L
[tex]V_1[/tex] = volume of stock solution = 20 ml = 0.02 L
[tex]C_2[/tex] = concentration of diluted solution= ?
[tex]V_2[/tex] = volume of diluted solution= 40 ml = 0.04 L
[tex]40g/L\times 0.02L=C_2\times 0.04L[/tex]
[tex]C_2=20g/L[/tex]
Thus new concentration is 20 g/L
Write the following number correct to 2 significant figures: 3644000
Hurry Plz NO TIME!!!
Which is true of synthesis and decomposition reactions
Complete question is;
What is true of synthesis and decomposition reactions?
A) Synthesis reactions require more energy than decomposition reactions.
B) Synthesis reactions produce more products than decomposition reactions.
C) Synthesis reactions are the opposite of decomposition reactions.
D) Synthesis reactions have fewer reactants than decomposition reactions.
Answer:
C) Synthesis reactions are the opposite of decomposition reactions.
Explanation:
Correct answer is option C. This is because, Synthesis reactions are defined as those whereby substances are combined together to form larger molecules/compounds. Whereas, decomposition reactions are the opposite due to the fact that they involve the breakdown of two or more substances.
What is the correct order for the seasons of winter, spring, summer, and fall in the Northern
Hemisphere?
Answer:
Therefore, for temperate areas in the northern hemisphere, spring begins on 1 March, summer on 1 June, autumn on 1 September, and winter on 1 December. For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June.
Explanation:
The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
What is season?A season is a subdivision of the calendar year based on variations in the local climate, ecology, and amount of daylight hours. The axial parallel of Earth's inclinator orbit of the Sun causes seasons on Earth.
Seasons are distinguished by differences in the amount of sunlight reaching Earth's surface in temperate as well as polar areas. These fluctuations may lead certain animals to migrate or go into hibernation while others may cause vegetation to fall dormant. The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
Therefore, the correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
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A student need to predict the mass of a block of aluminum. The block is 4.23 cm on all sides and the density of aluminum is 2.7 g/cm3. What will the mass of the block be?
Al agregar 150g de una sustancia X en un recipiente que sostiene que contiene agua hasta 50, el nivel del agua aumenta hasta 120ml. Calcula la densidad de la sustancia X
Answer:
2,14 g / ml
Explanation:
Sabemos que el volumen de una sustancia es igual al cambio de volumen del agua cuando el objeto en cuestión se sumerge en el agua.
Dado que el volumen original del agua = 50 ml
Volumen de agua después de sumergir el objeto = 120 ml
Masa del objeto = 150 g
Ahora,
Densidad = masa / volumen
Densidad = 150g / 120-50 ml
Densidad = 150/70 ml
Densidad = 2,14 g / ml
if you have 0.23 moles of compound AB2 (312g/mol), how many grams do you have?
Answer: 71.76
Explanation:
Answer:
71.76
Explanation:
You plug them in the equation said there
Can someone please help me with the with this
Answer:
Chemical
Explanation:
lithium sulphate is used in some medicines and its presence in a medicine can be shown by two a combination of two tests a)explain how a flame test could help in this context
b) Describe how you would test a solution of the medicine for the presence of sulphate ions.
C) write a balanced chemical equation, including state symbols, for the reaction occurring in B)
Answer:
A flame test could help by seeing what things it could catch on fire from or the things that could happen with acids etc. I would test the medicine by asking someone who has had it in their life, asking doctors or I would maybe use it myself maybe. (I don’t know about c, sooo sorry)
sulfric acid has the chemical formula H2SO. A certain quantity of sulfuric acid contains 4.89 x 10^25 atoms of oxygen. How many moles of sulfuric acid is in the sample?
Answer:
nsjsjdnsbsbsbhsbsndbxjxjdjdjxjskjxjsksjsjshsjsnjssjsk
Rocks are classified by
*
A) how they are formed
O B) when they were formed
OC) where they were formed
O D) their color when formed
Is sodium sulfide a ionic or covalent
Answer:
I would say iconic
Explanation:
please correct me if i am wrong
Sodium sulfide compound is an ionic compound. There are 2 Na atoms per 1 Sulfide atom.
Ions with opposing charges are created in ionic compounds when metal atoms transfer electrons to nonmetal atoms. Sodium gives one electron to sulphur in the case of sodium sulphide, resulting in the formation of positively charged sodium ions (Na+) and negatively charged sulphide ions (S2-). The complex is held together in a lattice structure by the electrostatic attraction between these ion pairs with opposing charges. Sodium sulfide's high melting and boiling temperatures, as well as its capacity to conduct electricity when melted or dissolved in water, are indications of its ionic nature.
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Which process uses the least amount of material to create electricity, coal or uranium, coal or nuclear power plant?
Answer:
nuclear power plant
Explanation:
Generation of electricity often involves the use of some kind of material or energy that is consumed as electricity is generated. There are various ways of generating electricity such as;
By burning coal
Use of a radioactive element as nuclear fuel
From wind energy
From water
From the sun, etc
Each process involves the intake of material or energy. The process that goes on in a nuclear power plant requires a radioactive fuel of which uranium is an example.
A nuclear plant uses the least amount of material (such as only 1g of uranium fuel) in electricity generation compared to the tons of coal burnt in order to generate electricity.
please help. 11) Tell how sexual reproduction and asexual reproduction are alike? How are they different?
Answer:
They are alike because they both form offspring.
How they are different, sexual reproduction requires a mate, and it takes time and energy. For asexual reproduction, it does not take a mate and it takes very little time and no energy.
What can air pollutants do?
Answer:
Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs.
Explanation:
A ring of pure gold has a mass of 17.3 grams. How many atoms of gold are in the ring?
Answer:
5.29936 x 10^23 atoms
Explanation:
To do this, we need to find the number of moles in the ring so that we can then multiply that by Avogadro's number (6.022×10^23).
equation for finding moles: [tex]n = \frac{mass}{M_{r} }[/tex]
substitute in the known values: [tex]n = \frac{17.3}{197 }[/tex]
divide to find the value of n: 0.088 mol
Multiply by Avogadro's constant: 0.088 x 6.022 x 10^23
= 5.29936 x 10^23 atoms in the ring.
hope this helps!
According to Avogadro's number, there are 5.289×10²² atoms of gold in 17.3 grams of ring.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
In the given problem, number of atoms of gold is found out as, number of atoms=17.3/196.966×6.022×10²³=5.289×10²² atoms.
Thus, there are 5.289×10²² atoms of gold in the ring.
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What happens to the amount of energy as it flows up the food chain
Answer:
It decreases because animals only get 10% of the energy they eat.
Explanation:
If liquids cannot burn, what makes them flammable? Give an example of a flammable
liquid.
Explanation:
its the vaporizer that air brun
A compound has the empirical formula C2H40, and its formula mass is 88
g. What is the subscript for oxygen in the molecular formula? *
Answer:
2
Explanation:
The molecular formula can be derived from the empirical formula of a compound and the molecular mass as follows:
(C2H4O)n = 88g/mol
Where;
C = 12, H = 1, O = 16
{12(2) + 1(4) + 16}n = 88g/mol
{24 + 4 + 16}n = 88
(44)n = 88
44n = 88
Divide both sides by 44
n = 88/44
n = 2
The molecular formula is: (C2H4O)n
= (C2H4O)2
= C4H8O2
According to the question asked, oxygen has a subscript of 2 in the molecular formula.