Answer: Atoms combine to make all the substances on Earth.
Explanation:
Atom is a smallest entity of any matter. The atoms of different elements combine together in order to form new substances. The atoms have electrons, neutrons, as well as protons. The atoms are combined by the chemical bond. When two or more atoms combine they form a molecule. The molecules combine to form compound. Atoms cannot be broken into sub parts. The two atoms of hydrogen and one of oxygen forms water which is an essential liquid on planet earth. Other substances like carbon dioxide, coal, and sodium chloride.
A metal ion (X) with a charge of 4+ is attracted to non metal ion (Z) with a charge of 3-. Which of these formulas represents the resulting compound pls answer asap options in photo
Answer:
D
Explanation:
the charges need to balence out
so finding the LCM which is 12 we find we need 3x's
and 4 zs
so that makes the formula X3Z4 which is D
what is the effect of heat and light on chemical reaction
Answer:
Exothermic reactions release heat and light into their surroundings. For example, combustion reactions are usually exothermic. In exothermic reactions, the products have less enthalpy than the reactants, and as a result, an exothermic reaction is said to have a negative enthalpy of reaction.
Answer:
Is it fire onn a bottle?
Explanation:
Because I thought that if you shine light ona ANYTHING plastic, the chemical reaction is a little fire.
Consider the reaction between a solution of molecule A and a solid block of molecule B. In general, for a reaction to occur, the reactant molecules must be in contact with each other. Therefore, increasing the frequency of collisions between A and B molecules allows the reaction to occur more quickly. Identify the change in reaction condition that will increase the frequency of the molecular collisions.
Answer:
Decreasing the volume of solvent in the solution of molecule A
Explanation:
We know that one of the factors that affect the rate of reaction is the concentration of the reactants. The greater the concentration of reactants, the faster the rate of reaction (the greater the frequency of collision between reactants).
Hence, when we decrease the volume of solvent in the solution of molecule A, the concentration of the solution increases and consequently more particles of molecule A are available to collide with particles of molecule B resulting in a higher rate of reaction.
Comparing metalic and covalent bonds in terms of nature of the bond
Answer:
Covalent bond involves the sharing of electrons, while metallic bonds have strong attractions and ionic bonds involve the transferring and accepting of electrons from the valence shell. The adhering property of an atom, in order to arrange themselves in a most stable pattern by filling their outermost electrons orbit.
One mole of hydrogen is equal to____
how much energy must be released by 50.0 g of steam to decrease its temperature from 125.0 degrees Celsius to 100.0 degrees Celsius ?
Answer:
5250 Joules
Explanation:
Mass = 50g
Initial Temperature = 125.0 degrees Celsius
Final Temperature = 100 degrees Celsius
Temperature change = Final - Initial = 100 - 125 = -25
Heat = ?
These quantities are related by the equation;
H = mCΔT
where c = specific hear capacity = 4.2 J/g°C
H = 50 * 4.2 * (-25)
H = -5250 J (The negative sign is because heat is being released)
How many formula units make up 21.6 g of magnesium chloride (MgCl2)? Express the number of formula units numerically.
1.37 × 10²³ formula units MgCl₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 21.6 g MgCl₂
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of Mg - 24.31 g/mol
[PT] Molar Mass of Cl - 35.45 g/mol
Molar Mass of MgCl₂ - 24.31 + 2(35.45) = 95.21 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 21.6 \ g \ MgCl_2(\frac{1 \ mol \ MgCl_2}{95.21 \ g \ MgCl_2})(\frac{6.022 \cdot 10^{23} \ formula \ units \ MgCl_2}{1 \ mol \ MgCl_2})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 1.36619 \cdot 10^{23} \ formula \ units \ MgCl_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.36619 × 10²³ formula units MgCl₂ ≈ 1.37 × 10²³ formula units MgCl₂
Are the gas laws affected depending on whether you use heavy gas particles or light gas particles? If anything, what is affected by the size of the molecule?
Answer:
yes
Explanation:
Yes, size of molecule has greatly affected the gas law.
The gas laws affected depending on whether we use heavy gas particles or light gas particles because the heavy gas particles can't move faster as light gas particles with the increase of temperature.
If the temperature is increased, the gas particles move faster due to absorb of heat energy so they hit the walls of the container. This causes the pressure to rise. The pressure of a gas also increases when the volume of container in which it is placed is decreased. Bigger the molecule size, the stronger the intermolecular forces, so the molecule has higher melting and boiling points so we can conclude that big size molecule greatly affected the gas law.
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Which of these is the best definition of sustainable development
Answer:
Sustainable development is a way for people to use resources without the resources running out. ... The term used by the Brundtland Commission defined it as development with sustainability that "meets the needs of the present and also compromising the ability of future generations to meet their own needs."
Please help 3. The combustion of glucose is represented by the following balanced equation: C6H12O6 + 602 - 6H20 + 6CO2.
Which reactant is the limiting reagent if there is 1 gram of both C6H12O6 and O2? (Hint: Must convert to moles to determine this.)
O a C.H 20
O bO2
O c H₂O
Od CO₂
Answer:
Explanation:
C₆H₁₂O₆ + 60₂ = 6H₂0 + 6CO₂.
1 mole 6 mole
molecular weight of C₆H₁₂O₆ = 180 g
molecular weight of oxygen = 32 g
1 gram of glucose = 1 / 180 = 5.55 x 10⁻³ moles
1 gram of oxygen = 1 / 32 = 31.25 x 10⁻³ moles
1 mole of glucose reacts with 6 moles of oxygen
5.55 x 10⁻³ moles of glucose will react with 6 x 5.55 x 10⁻³ moles of oxygen
= 33.30 x 10⁻³ moles of oxygen .
But oxygen available = 31.25 x 10⁻³ moles
So available oxygen is less than required .
Hence oxygen is the limiting reagent .
b ) is the right option .
Read the choices below. then select ALL choices that are true.
Higher temperature will cause more collisions.
Lower temperature will cause less collisions.
Higher temperature provides more activation energy!
Lower temperatures cause some atoms to bounce off each other and not react.
Answer:
Higher temperature will cause more collisions.
Lower temperature will cause less collisions.
Higher temperature provides more activation energy!
Explanation:
pls mark brainliest :)
What does it mean for heat to be transferred by thermal conduction?
Answer:
thermal energy
Explanation:
Thermal conduction is the diffusion of thermal energy (heat) within one material or between materials in contact. The higher temperature object has molecules with more kinetic energy; collisions between molecules distributions this kinetic energy until an object has the same thermal energy throughout.
Answer:
energy is transferred when one molecule collides with another.
Explanation:
aP33x
How does a temperature increase cause the rate of a reaction to increase?
O A. It increases the kinetic energy of the molecules.
O B. It decreases orientation requirements of the molecules,
C. It increases the equilibrium constant for the reaction,
D. It decreases the activation energy of the reaction.
Help me please !!!
Answer:
the answer is c because it will have a equilibrium constant for the action
A temperature increase causes the rate of a reaction to increase because it increases the kinetic energy of the molecules. The correct answer is option A.
Kinetic energy is the energy that an object possesses due to its motion. It is defined as one-half of the mass of an object multiplied by the square of its velocity.
This means that the molecules move faster and collide more frequently, which increases the likelihood of successful collisions between reactant molecules. An increase in temperature also increases the average kinetic energy of the molecules, which means that more of them will have enough energy to overcome the activation energy barrier and react.
Therefore, increasing the temperature increases the kinetic energy of the molecule. Option A is the correct answer.
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Why do the oil and vinegar separate into layers when they are stirred together, but completely mix when lecithin is stirred in?
Answer:
See explanation
Explanation:
Vinegar and oil have different densities, as such we expect the two substances to separate when mixed. However, oil constitutes the organic phase(water insoluble) while vinegar constituents the aqueous phase since it is water soluble. Therefore, the two substances separate into layers when left to stand for a while.
The structure of lecithin makes it a good emulsifier. Hence, it can be able to cause oil and vinegar to mix, constituting a single phase when lecithin is stirred in.
Vinegar molecules and oil molecules are not attracted to one another. Lecithin is attracted to both vinegar molecules and oil molecules. Due to this attraction, lecithin can cause vinegar and oil to mix evenly.
Due to their immiscibility, oil and vinegar separate into layers when they are mixed together. Oil is non-polar, but vinegar (which is acetic acid that has been diluted) is polar. Because of their different polarity, these compounds are said to be "immiscible," which means they do not mix well or create a stable solution when combined. When you stir oil and vinegar together, the agitation causes them to mix to some extent at first, but the various interactions between their molecules cause them to quickly separate into distinct layers.
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what is the effect of heat and light on chemical reaction
Lesson Question: What is the effect of
pressure on the volume of a gas?
To answer this question, you used weight to
change the pressure of the gas and
measured the
resulting changes to the gas's volume.
COMPLETE
The amount of gas (in terms of moles, mass, and
molecules):
Answer:
pressure
volume
was constant
Boyle's
Explanation:
Answer:
the first one is pressure &volume the second one is was constant the third one is Boyle's
Explanation:
Question 9 a N20(9) + CO(9) - N2(9) + CO2(9) The rate of the reaction represented above increases significantly in the presence of Pd(s). Which of the following best explains this observation?
А Pd increases the activation energy of the reaction.
B Pd absorbs the heat produced in the reaction. C One of the reactants binds on the surface of Pd, which introduces an alternative reaction pathway with a lower activation energy.
D One of the products binds on the surface of Pd, which increases the reaction rate by decreasing the concentration of products in the mixture.
Answer:
Ans choise B
Explanation:
Increasing rates of reaction by catalysts always results because of decrease in activation energy occurs.
g As the number of nonvolatile solute particles in a given volume of solution increases, A) the boiling point increases and the vapor pressure at 25°C increases. B) the freezing point decreases and the vapor pressure at 25°C decreases. C) the freezing point increases and the vapor pressure at 25°C increases. D) the boiling point decreases and the vapor pressure at 25°C decreases. E) the freezing point increases and the vapor pressure at 25°C decreases.
Answer:
B) the freezing point decreases and the vapor pressure at 25°C decreases.
Explanation:
Colligative properties are those properties that depend on the amount of solute in solution. Both freezing point and vapour pressure are colligative properties.
As the number of nonvolatile solute particles increases, the freezing point of the solution decreases. This is known as freezing point depression.
Similarly, "Vapor pressure is a colligative property, so the vapor pressure of solutions is directly proportional to the amount of solute present in a solution. When a solute is present in a solvent, the vapor pressure is lowered because fewer solvent molecules are present at the top of the solution" (Lumen Learning).
Answer:
f u moderators
Explanation:
euurhtiuubbfjdhbgvzrbsf im sorry
A compound X has the following percentage composition 66.7% carbon, 11.1% hydrogen and 22.2% oxygen .Calculate the empirical formula of X.The relative molecular mass of X is 72 calculate the molecular formula
Explanation:
c. h. o
66.7%. 11.1%. 22.2%
____. ____. ____
12. 1. 16
1.558. 11.1. 1.39. (divide by the smallest)
1. 8. 1
empirical formula=ch8o
g When water and perchloric acid (HClO4) are mixed, heat is released. The resulting solution is not an ideal solution, in terms of Raoult’s Law. How should the boiling point and the vapor pressure of a solution of HClO4 in H2O differ from what is expected for an ideal solution? A) boiling point higher than expected, vapor pressure lower than expected B) boiling point higher than expected, vapor pressure higher than expected C) boiling point lower than expected, vapor pressure lower than expected D) boiling point lower than expected, vapor pressure higher than expected E) boiling point and vapor pressure are both the same as expected for an ideal solution
Answer:
A) boiling point higher than expected vapor pressure lower than expected.
Explanation:
When water is introduced with heat it vaporize at a temperature of 100 degree centigrade. When hydrochloric acid is added to the water its boiling point of water increases slightly. The difference in the boiling point is due to the presence of heavier molecules in acid.
IUPAC name for c2h2cl2?
Answer:
okay that is cool
Explanation:
Answer:
I hope it helps u! :)
Explanation:
Convert Fahrenheit temperature
to Kelvin scales
Answer:
K = (F – 32)5/9 + 273.15
Explanation:
You basically convert Fahrenheit to Celcius and then to Kelvin
Here's the entire formula:
K = (x °F – 32)5/9 + 273.15
The three temperate marine climates are?
Marine west coast, humid subtropical, and Mediterranean.
Which substance is one that cannot be separated or broken down into simpler substances by chemical means? (Element, pure)
table salt (NaCl)
gold wire (Au)
candle wax (CH2O)
water vapor (H2O)
Answer:
gold wire (Au)
Explanation:
A substance that cannot be separated or broken down into simpler substances by chemical means is an element.
Between the given options only gold wire is an element, Au.
A way of knowing that it is an element is noticing that its formula is a single symbol which corresponds to an element found in the periodic table, unlike a combination of said symbols (like NaCl or H₂O).
A heterogeneous ore mixture contains 35.0 % In2O3 by mass. How many tons of the ore must be mined to provide 325.0 kg of indium metal? (2000 lb = 1 ton, assume exact)
Answer:
1.2375 ton of ore
Explanation:
Mass of indium = 325
Formula = In2O3
Molar mass = 277.64 g/mol
Molar mass of indium = (2*114.8)g
229.6 indium is in 277.64 of In2O3
Mass of In2O3 required = 277.64/229.6 x 325
= 392.94kg
35 % In2O3 in ore
For 35 kg = 100 kg required
For 392.94,
100/35 x 392.94
= 1122.686 kg
1122.68 x 2.2
= 2469.9 pounds
2469.9/200
= 1.235 tons of ore
Choose the more metallic element from each pair.
a . Sr or Sb,
b. As or Bi,
c. Cl or O,
d. S or As
Answer:
c
Explanation:
CI or O
Carla Vista Company has the following information available for September 2020.
Unit selling price of video game consoles $410
Unit variable costs $328
Total fixed costs $36,900
Units sold 600
Compute the unit contribution margin.
Unit contribution margin enter the unit contribution margin
Prepare a CVP income statement that shows both total and per unit amounts.
Compute Carla Vista’ break-even point in units.
Break-even point in units enter Break-even point in units units
Prepare a CVP income statement for the break-even point that shows both total and per unit amounts.
The more metallic element pair is Cl or O. Therefore, option C is correct.
What is metallic element ?Except for hydrogen, which is a nonmetal, the elements are arranged in a triangle with the metals to the left, the nonmetals to the right, and the metalloids to the immediate right of the triangle.
Metal atoms are bound together by metallic bonds to form solids known as metallic solids. Metal solids include things like copper, gold, and zinc, for instance. Since cesium is the last naturally occurring alkali metal, it has the most metallic characteristics.
The non-metal components, like as rock and rubbish, are subsequently removed from the ore during processing. The subsequent melting and combining of various metal components yields metal alloys. A solid metal alloy substance is produced when the freshly combined metal compound has cooled.
Thus, option C is correct.
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3. What is an
electrolyte?
Answer:
An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. ... A substance that dissociates into ions in solution acquires the capacity to conduct electricity. Sodium, potassium, chloride, calcium, magnesium, and phosphate are examples of electrolytes.
Explanation:
Please give thanks to all my answers and please mark as brilliant and please follow me
What is the formula for Pentasulfur heptaoxide
Answer:
S5O7
Explanation:
what is the name of these 4 compound in isomers
Answer:
C9H19 C5H12 C6H17 C7H20
Convert 75g of NaOH to moles
Answer:
75g and I no inglish I my espanish perfec
Explanation:
