Answer:
For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
Explanation:
PLEASEEEE HELPPP ME WITH THISS
A person riding in the passenger seat of a car is "pushed" into the car door as the car makes a sharp left turn.
Newton's 2nd Law
Newton's 1st Law
Newtons 3rd Law
Answer:
second law
Explanation:
Which best describes MgO?
1)This is an ionic compound; it is named
magnesium monoxide.
2)This is a covalent compound; it is named
magnesium monoxide.
3)This is an ionic compound; it is named
magnesium oxide.
4)This is a covalent compound; it is named
magnesium oxide.
How does thermal energy affect chemical changes
Answer:
It makes chemicals hot or cold which makes chemicals react differently
Explanation:
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Which type of reaction is always spontaneous?
A. an exothermic reaction that has an increase in disorder
B. an exothermic reaction that has a decrease in disorder
C. an endothermic reaction that has an increase in disorder
D. an endothermic reaction that has a decrease in disorder
Answer:
A.) an exothermic reaction that has an increase in disorder.
Explanation:
got it correct (unit review test)
Please help me answer this question but in your own words!!!!
Answer:
when sodium reacts with chlorine atoms, sodium will give an electron which is negative charged to chlorine.it makes sodium(+) and chlorine (-)..then sodium will attract chlorine to form sodium chloride(NaCl)
What is the general form of a single replacement reaction
Answer: A. AB+C->CB+A
Explanation:
The chemical reaction includes the reactant and products. The single replacement reaction can be given as AB + C → CB + A. Thus option a is correct.
What is a single replacement reaction?A single replacement reaction is the exchange reaction that involves the substitution of a single element of the reactant with another element of the reactant species.
The reaction between zinc and copper chloride is a single replacement reaction as copper is replaced by zinc in the copper chloride compound to produce zinc chloride and copper.
Therefore, option A. AB + C → CB + A is the single replacement reaction.
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A rectangular block of copper metal has a mass of 1896 grams. The volume of the block is 2cm^3. From this data, what is the density of the copper?(Please show how you got this answer)
Which activity is an example of a scientist using creativity?
a scientist exploring evidence from other fields of science to support findings
a scientist transferring data from one experiment into the data analysis from a second experiment
a scientist repeating an older experiment with the latest technology to verify the original findings
a scientist using the latest graphing software to analyze and present the research
A scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.
What is creativity?Creativity is a mental cognitive ability that involves the creation and/or discovery of a hidden process.
In science, creativity refers to the application of mental skills to create new experimental designs and extrapolate findings.
In conclusion, a scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.
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Which best replaces the question mark?
Answer:Waves.sry if this is wrong.
Explanation:
17.Oxygen gas can be prepared by heating potassium chlorate according to the following equation:
2KClO3(s)2KCl(s) + 3O2(g)
The product gas, O2, is collected over water at a temperature of 25 °C and a pressure of 755 mm Hg. If the wet O2 gas formed occupies a volume of 6.22 L, the number of grams of O2 formed is ________
g. The vapor pressure of water is 23.8 mm Hg at 25 °C.
Mass of O₂ formed = 7.84 g
Further explanationGiven
Reaction
2KClO₃(s) ⇒2KCl(s) + 3O₂(g)
P water = 23.8 mmHg
P tot = 755 mmHg
V = 6.22 L
T = 25 + 273 = 298 K
Required
mass of O₂
Solution
P tot = P O₂ + P water
P O₂ = P tot - P water
P O₂ = 755 - 23.8
P O₂ = 731.2mmHg = 0.962 atm
Moles O₂ :
Ideal gas law :
n = PV/RT
n = 0.962 x 6.22 / 0.082 x 298
n = 0.245
Mass O₂ :
= mol x MW
= 0.245 x 32
= 7.84 g
Define energy and power then describe the relationship that exists between them.
Try for at least 3 complete sentences
Sentence starters:
Energy is.... Power is.... They are related because.....
Answer: With power and energy, power is units of energy divided by time. The same difference as distance and velocity. The units of power are watts, the units of energy are joules.
Explanation:
abcdefghijklmnopqrstuvwxyzExplanation:abcdefghijklmnopqrstuvwxyz
A chemistry student is recording the electric charges of some atoms. Use the results in the chart to answer the following questions.
Atom Electric Charge
Carbon −4
Nitrogen +5
Oxygen −2
Part A:
Write an equation to find the difference in electric charge between the Nitrogen atom and the Oxygen atom.
Part B:
Using the equation you wrote in Part A, what is the difference in electric charge between the two atoms?
If a 12-volt battery produces a current of 20 amps, what is the resistance?
Answer:
0.6 Ω
Explanation:
From the question given above, the following data were obtained:
Voltage (V) = 12 V
Current (I) = 20 A
Resistance (R) =?
From Ohm's law,
V = IR
Where:
V => is the voltage
I => is the current
R => R is the resistance
With the above formula, we can obtain the resistance as follow:
Voltage (V) = 12 V
Current (I) = 20 A
Resistance (R) =?
V = IR
12 = 20 × R
Divide both side by 20
R = 12 / 20
R = 0.6 Ω
Thus the resistance is 0.6 Ω
How would you solve this?
Which element could provide one atom to make an ionic bond with oxygen?
Answer:
Magnesium
Explanation:
The element that could provide one atom to make an ionic bond with oxygen is magnesium.
Generally, most group II elements will form an ionic bond with oxygen with just one atom.
An ionic bond forms by the transfer of electrons from one specie to another.
Oxygen has a charge of 2-, to use one atom to form ionic bond with this specie, a magnesium atom with 2+ charge will bond with the specie.
This will form:
MgO
This is notable for other group II elements.
what is the percent composition of (NH4)2S?
if you can, include the problem shown pls
extra.
Mg(NO3)2
please don't just take the points please :(, do the problem
thank you <333
(NH₄)₂S
%N= 41.18%
%H =11.76%
%S=47.06%
Mg(NO₃)₂
%Mg=32.43%
%N=18.92%
%O=(64.86%
Further explanationGiven
(NH₄)₂S
Mg(NO₃)₂
Required
The percent composition
Solution
(NH₄)₂S MW=68 g/mol
%N=2. Ar N / MW (NH₄)₂S x 100%
%N= (2.14/68) x 100% = 41.18%
%H =(8.1/68) x 100%=11.76%
%S=(32/68)x 100%=47.06%
Mg(NO₃)₂ MW=148 g/mol
%Mg=(2.24/148)x100%=32.43%
%N=(2.14/148)x100%=18.92%
%O=(6.16/148)x100%=64.86%
16.A mixture of carbon dioxide and hydrogen gases contains carbon dioxide at a partial pressure of 217 mm Hg and hydrogen at a partial pressure of 703 mm Hg. What is the mole fraction of each gas in the mixture?
XCO2 =
XH2 =
x CO₂ = 0.236
x H₂ = 0.764
Further explanationGiven
P CO₂ = 217 mmHg
P H₂ = 703 mmHg
Required
The mole fraction
Solution
Dalton's law :
The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
P tot for the mixture :
= 217 mmHg + 703 mmHg
= 920 mmHg
Mole fraction of each gas :
x CO₂ = 217 mmHg/920 mmHg = 0.236
x H₂ = 703 mmHg/920 mmHg = 0.764
If the heat of combustion for a specific compound is −1160.0 kJ/mol and its molar mass is 86.47 g/mol, how many grams of this compound must you burn to release 541.20 kJ of heat?
Answer:
40.34 g
Explanation:
First, we divide the heat to release by the heat of combustion to obtain the required moles of compound:
541.20 kJ/(1160.00 kJ/mol) = 0.4665 mol
So, we have to burn approximately 0.47 mol of the compound. We convert the moles to mass in grams by using the molar mass:
mass = molar mass x moles = 86.47 g/mol x 0.4665 mol = 40.34 g
Therefore, you must burn 40.34 grams of the compound to release 541.20 kJ of heat.
Base your answer on the information below. The hydrocarbon 2-methylpropane reacts with iodine as represented by the balanced equation below. At standard pressure, the boiling point of 2-methylpropane is lower than the boiling point of 2-iodo-2-methylpropane. Explain the difference in the boiling points of 2-methylpropane and 2-iodo-2-methylpropane in terms of both molecular polarity and intermolecular forces.
Answer:
See explanation
Explanation:
The boiling point of a substance is affected by the nature of bonding in the molecule as well as the nature of intermolecular forces between molecules of the substance.
2-methylpropane has only pure covalent and nonpolar C-C and C-H bonds. As a result of this, the molecule is nonpolar and the only intermolecular forces present are weak dispersion forces. Therefore, 2-methylpropane has a very low boiling point.
As for 2-iodo-2-methylpropane, there is a polar C-I bond. This now implies that the intermolecular forces present are both dispersion forces and dipole interaction. As a result of the presence of stronger dipole interaction between 2-iodo-2-methylpropane molecules, the compound has a higher boiling point than 2-methylpropane.
When Nitrogen gas gets cold enough it can form a liquid. This liquid nitrogen is an
example of what?
A. A chemical change because it took a significant temperature drop to convert
nitrogen from gas to liquid.
B. A chemical change because the nitrogen underwent a conversion from gas to a
liquids.
C. A physical change because it was only a state change from solid to liquid.
D. A physical change because the temperature drop causes the molecules to completely rearrange.
Answer:
C.
Explanation:
Phase change is physical.
When Nitrogen gas forms a liquid is a physical change because it was only a state change from solid to liquid. Therefore, option C is correct.
What is a physical change?A physical change takes place when some of the features of the matter change but the identity of the material does not. Physical changes can be categorized as reversible and irreversible. For example, the melting of water is reversible since the melted ice can be refrozen.
Physical change can be described as a kind of change where only physical properties of matter such as solubility, color, odor, etc. can change. During physical changes in matter, there will be no chemical bonds are broken or formed between atoms in the molecule.
The chemical composition as well as the chemical nature of the material will remain unchanged while a physical change. The molecules can rearrange without changing the internal chemical composition of matter.
Therefore, changing the state of nitrogen gas is a physical change.
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Please answer question #4
Answer:
F=500×3 = 1500 N
W = 1500×10 =15000 Nm
HELP PLS 50 POINTSSSS
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more
information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the
diagram. If an item describes more than one category, be sure to place it in the overlapping space.
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Carbon dioxide is a product. Carbon dioxide is a reactant. Carried out in animals.
Carried out in plants
Chemical Reaction
Oxygen is a product
Oxygen is reactant Produces usable energy sourc
Cellular Respiration
Both
Photosynthesis
Answer:
Carbon dioxide is a product (cellular respiration)
Carbon dioxide is a reactant(photosynthesis)
Carried out in animals(cellular respiration)
Carried out in plants(both)
Chemical reaction(cellular respiration)
Oxygen is a product(photosynthesis)
Oxygen is a reactant(cellular respiration)
Produces usable energy source(photosynthesis)
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Answer:attached is the correct answer
Explanation:
Photosynthesis and Respiration
what type of reaction is Au2S+H2---> 2Au+H2S
Answer:
single replacement reaction is type of reaction is Au2S+H2---> 2Au+H2S.
_Li + __F2 → _LIF
How do I balance this?
Answer:
2Li + F₂ → 2LiF
Explanation:
The reaction expression is given as:
Li + F₂ → LiF
We are to balance the expression. In that case, the number of atoms on both sides of the expression must be the same.
Let use a mathematical approach to solve this problem;
Assign variables a,b and c as the coefficients that will balance the expression:
aLi + bF₂ → cLiF
Conserving Li: a = c
F: 2b = c
let a = 1, c = 1 and b = [tex]\frac{1}{2}[/tex]
Multiply through by 2;
a = 2, b = 1 and c = 2
2Li + F₂ → 2LiF