Answer:
Pure elements:
Hydrogen(H)
Nitrogen(N)
Magnesium (Mg)
Pure Compounds:
Oxygen gas(O2)
Water (H2O)
Ammonia (NH3)
Explanation:
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Describe the bonding process when two hydrogen atoms combine to
form a diatomic molecule of hydrogen.
Answer:
The electrons located between the two nuclei are bonding electrons. A hydrogen molecule forms from two hydrogen atoms, each with one electron in a 1 s orbital. The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond. The bond is represented either as a pair of dots or as a solid line.
Which is an example of a homoozygous genotype? (There can be more than one answer)
Hh
HH
hh
Answer:
HH and hh
Explanation:
they are the same
Students were asked to select methods to increase the rate of dissolving a solid. Which methods would increase the rate?
Increasing the surface area, stirring or agitating the mixture, raising the solvent's temperature, and employing a solvent with a stronger polarity or one that is more similar to the solid's chemical makeup are all ways to speed up the dissolving process.
The methods to increase the rate of dissolving a solid.There are several methods that can increase the rate of dissolving a solid, including:
Increasing the surface area of the solid by crushing, grinding or pulverizing it into smaller pieces.
- Stirring or agitating the mixture, which helps to distribute the solvent and increase contact between the solvent and the solid.
- Increasing the temperature of the solvent, which increases the kinetic energy of the solvent molecules, making them more likely to collide with and dissolve the solid.
- Using a solvent that has a higher polarity or is more similar in composition to the solid, which can increase the attraction between the solvent and the solid and promote faster dissolving.
Therefore, the methods that would increase the rate of dissolving a solid are increasing surface area, stirring or agitating the mixture, increasing the temperature of the solvent, and using a solvent that has a higher polarity or is more similar in composition to the solid.
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What is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?
1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
q = mCpΔT
Solve for Cp —> Cp = q/mΔT
q = -6700 J (negative because it released heat)
m = 70 g
ΔT = Final temp - initial temp = 25 - 90 = -65°C
Cp = (-6700 J) ÷ (70 g)(-65°C)
= 1.47 J/g°C
Hence, 1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.
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Use your understanding of the terms "soluble" and "insoluble" to explain why you must shake a bottle of salad dressing made with oil and vinegar before you use it.
Answer:
See explanation
Explanation:
In chemistry, the idea of "like dissolves like" is of utmost importance. A substance is only soluble in another with which it can effectively interact.
We must note that to be "soluble" means that the solute actually interacts effectively (dissolves) in the solvent.
However, vinegar is a polar substance while oil is a non polar substance hence the two can not effectively interact. That is, the vinegar can not dissolve in oil.
The two will separate into two phases upon standing. Therefore, the bottle of salad dressing made with oil and vinegar must be shaken in order to mix the two thoroughly before it is used.
What can the period number of an element tell us about that element?
Answer:
All of the elements in a period have the same number of atomic orbitals.
Explanation:
NEEED HELP PLEASE IM VERY STRESSED
Answer:
C) It moves faster and collects more data
Explanation:
determine the velocity. a runner completes a 10km race in 33.6 minutes
Answer:
17.86km/hr
Explanation:
Speed or velocity is calculated using the formula:
Speed (v) = distance (d) ÷ time (t)
According to the information given in this question;
Distance = 10km
Time = 33.6minutes = 33.6/60 = 0.56hours
Speed/velocity = 10/0.56
= 17.857
= 17.86km/hr
Answer:
0.297619048
Explanation:
distance= 10 km
time= 33.6 min
10/33.6
v= 0.297619048
or 0.29
Find the mass of 0.456 mol of Ca(OH)2
Please if you can show the work.
Answer:
Ca(OH)2 molecular weight. Molar mass of Ca(OH)2 = 74.09268 g/mol. This compound is also known as Calcium Hydroxide. Convert grams Ca(OH)2 to moles or moles Ca(OH)2 to grams. Molecular weight calculation: 40.078 + (15.9994 + 1.00794)*2 ››
Hey,
QUESTION)A) Let's first calculate the molar mass M of the molecule :
M(Ca(OH)₂) = M(Ca) + 2M(O) + 2M(H)
M(Ca(OH)₂) = 40 + 2 x 16 + 2 x 1 M(Ca(OH)₂) = 74 g/molB) Let's deduct the corresponding mass m :
m = M x n
m = 74 x 0.456 m = 33.744 g m ≈ 34,0 gThe mass of calcium hydroxide corresponding to this quantity of substance (in mol) is therefore 34 g.
What is the molecular formula for Hydrochloric acid
Answer:
HCI
Explanation:
Hope this helps. :))))
How do we know if molecules have kinetic energy?
Help me please!
Main-block transition metals, such as iron, make good building materials for all of the following reasons EXCEPT____.
A. Resistance to corrosion
B. Insulation
C. Strength
D. High density
How many moles of water are produced when 6.0 moles of hydrogen gas react with 2.5 moles of oxygen gas?
Answer:
2.5 mole O2 should react (2 * 2.5) = 5.0 mole H2 but there is 6.0 mole H2. H2 remain in excess. O2 is the limiting reactant. mole of H2O formed = 2 * 2.5 = 5.0 mole.
Moles of water are produced when 6.0 moles of hydrogen gas react with 2.5 moles of oxygen gas
Balanced equation: 2H2 + O2 → 2H2O
2.5 mole O2 should react (2 × 2.5) = 5.0 mole
H2 but there is 6.0 mole H2.
H2 remain in excess. O2 is the limiting reactant.
mole of H2O formed = 2 × 2.5 = 5.0 mole.
= 5.0 mole
If less than 6 moles of oxygen are available per mole of glucose, oxygen is the limiting reactant. The ratio is 6 mole oxygen per 1 mole glucose, OR 1 mole oxygen per 1/6 mole glucose.
Limiting reactant-Limiting reactant- the reactant that determines the amount of product that can be produced because of the amount of that reactant present. Whichever reactant yields the LEAST amount of product is the limiting reactant. This will be completely used up in the reaction. After the reaction is complete, there will be product, and unused excess reactant.Learn more about oxygen gas, refer
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What is the relationship between radioactive decay and radiometric dating?
Answer:
Radiometric dating, is called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
Explanation:
:)
can someone help me figure out what the Lewis structure for NCl2−?
Answer:
Chlorine is in group 7A, so it has 7 valence electrons
The Lewis structure for the molecule NCl²⁻ with -2 charge is attached in the image below.
What are Lewis structures?Lewis structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.It helps in understanding the bonding between the two atoms.
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Which component of weather describes the weight of the atmosphere pressing down on Earth? (2 points)
Air pressure
Air temperature
Precipitation
Wind direction
Answer:
Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.
Explanation:
Which organism is an example of a producer?
a. Wheat
b. Pigeon
c. cheetah
d. mushroom
Answer: wheat
Explanation: a pigeon does not produce food nor a cheetah or mushroom because a mushroom breaks down subsistence.
What do YOU think? Is the movement to 100% renewable energy possible? Why, or why not?
Answer:
i dont know
Explanation:
ask your science teacher
WILL MARK BRANLIEST HELP PLEASE
When copper sulfate and zinc metal interact, one atom of zinc replaces one atom of copper while the sulfate, made of 5 atoms, is unchanged. How many atoms are there before and after the interaction?
before: 5 atoms; after: 5 atoms
before: 6 atoms; after: 7 atoms
before: 6 atoms; after: 6 atoms
before: 7 atoms; after: 7 atoms
2Na + 2H2O → 2NaOH+ H2
How many grams of sodium would be needed to produce 1.00kg of sodium hydroxide?
Answer:
575 g
Explanation:
1 kg of sodium hydroxide is 1000/40=25 mol.
So 25 mol of sodium will be needed.
25 mol of sodium is 575 g.
According to the stoichiometry of the given chemical equation, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
46 g sodium gives 80 g sodium hydroxide, thus 1000 g sodium hydroxide requires 46×1000/80=575 g sodium.
Thus, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.
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SeS3 covalent compound name?
Answer:
Selenium trisulfide
How many moles of solute should be dissolved into 3.0 L of solvent to make a concentration of 2.0 M?
6.0 mol
1.5 mol
0.67 mol
1.0 mol
Answer:
There are 0.1 moles of solute in 250 mL of 0.4 M solution.
dentify the base in this acid-base reaction:
Upper N a upper O upper H plus upper H upper C l right arrow upper N a upper C l plus upper H subscript 2 upper O.
NaOH
HCl
NaCl
H2O
Answer:
NaOH
Explanation:
Sodium hydroxide is the base in the acid-base reaction as all other acids and sodium chloride is salt and water is neutral.
What is a base?According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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46:56
A piece of carpet is 8 feet wide and 12 feet long. The carpet needs to be reduced by a scale factor so that the reduced carpet is 2 feet wide. What is the area of the reduced carpet?
6 square feet
12 square feet
24 square feet
48 square feet
Answer:
12 square feet i jope.please be right
Air mass is a huge body of air which has the same general properties as the land or water over which it forms. *
True
False
Answer:
True
Explanation:
Bc why not? :)
Give reasons :
Concentrated H2SO4 cannot be used instead of dilute H2SO4 in laboratory preparation of hydrogen gas why ?
Select the correct answer. Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred? OA It's a chemical reaction because a new substance has formed. O B. It's a physical change because the water and the salt kept their original properties. O C. It's an example of synthesis because two substances reacted to give one substance. O D. It's a chemical reaction because the water now tastes salty but originally did not.
HELLLPPPP PLEASEEEEE!!!!!
Answer:
B. It's a physical change because the water and the salt kept their original properties.
Explanation:
Even though it tastes like salty water, the salt is still present, just in smaller molecules. It can be brought back so it is a physical change.
Which solubility curve on the right best represents the data table on the left?
DO NE
Solubility of Sugar in Water
Solubility of Sugar in Water
300
Temperature
(°C)
Sugar Dissolved
(grams)
250
200
0
89
150
Sugar per 100g H20
30
110
100
144
50
60
0
0
90
208
100
20 40 60 80
Temperature (°C)
Answer: Blue curve
Answer:
blue curve on edge :)
Explanation:
Which of the following elements is the most reactive?
A. Ba
B. Cs
C. Hf
D. Lu
Answer: Cs because its further to the right on the table, meaning its more reactive.
Explanation:
Answer:
Cs
Explanation:
This element is the farthest right, and lowest meaning that its reactivity is very high.
1. valence electrons and electronegativity
2. Both reactivity and electronegativity decrease down a group.
3. Electronegativity decreases down a group and reactivity increases down a group.
4. The number of valence electrons increases from left to right.
5. Cs
{quizlet: captncrun}
Help e please i give brainlist
Answer:
c
Explanation: