Answer:
A
Explanation:
They have the same number of positive protons & negative electrons, hope this helps
What are Ion formations?
Answer:
Ions are formed when atoms lose or gain electrons, with the metal transferring electrons to the outermost shell of the non-metallic atom
Please help with this
Which quantity is equivalent to 1 millisecond?
A.
0.1 second
B.
1,000 seconds
C.
0.001 second
D.
100 seconds
Answer:
C. 0.001 second
Explanation:
Millisecond is a subunit of a second.
Milli depicts a unit to the power of 10⁻³
So;
1 millisecond = 10⁻³ s
Therefore,
1 x 10⁻³ = 0.001s
The solution to this problem is choice C which is 0.001 second
A plot of lnk against 1 T has a slope of−2575 K and an intercept of 31.5. What is the pre-exponential factor A(s−1) of this first order reaction
Answer:
4.79x10¹³s⁻¹
Explanation:
For a first order reaction, the graph of ln k against 1/K follows Arrhenius equation:
lnK = ln A - Ea/RT
Where A is pre-exponential factor, Ea is activation energy, R gas constant and T is absolute temperature
If you graph ln k = y and 1/T = x:
y = lnA - Ea/R x
Where the slope = -Ea/R
And the intercept = lnA
To solve the pre-exponential factor:
31.5 = lnA
e^31.5 =
4.79x10¹³s⁻¹s⁻¹ because the reaction is first order.
The pre - exponential factor is obtained form the information given ion the question as 4.79 × 10^13 s−1.
For a first order reaction, the Arrhenius equation is written as;
lnk = (-Ea/R)1/T + lnA. This is similar to the equation of a straight line, y = mx + c.
The pre-exponential factor is the intercept (c). Hence;
ln A = 31.5
A = e^31.5
A = 4.79 × 10^13 s−1
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Calculate the number of grams of sodium oxide that will be produced when 115g of sodium react with oxygen.
Answer:
Mass = 154.95 g
Explanation:
Given data:
Mass of sodium react = 115 g
Mass of sodium oxide formed = ?
Solution:
Chemical equation:
4Na + O₂ → 2Na₂O
Number of moles of sodium:
Number of moles = mass/molar mass
Number of moles = 115 g/ 23 g/mol
Number of moles = 5 mol
Now we will compare the moles of sodium and sodium oxide.
Na : Na₂O
4 : 2
5 : 2/4×5 = 2.5 mol
Mass of sodium oxide:
Mass = number of moles × molar mass
Mass = 2.5 mol × 61.98 g/mol
Mass = 154.95 g
A person plugs a power cord into an electrical outlet in the wall. The power cord is covered in black rubber. Which statement is an accurate description of the materials?(1 point)
Electrons move through air when the cord is a few inches from the outlet.
Electrons would easily move through the person if there was no rubber around the wire.
Electrons would not move through the wire if there was no rubber around the wire.
Electrons easily move through the rubber around the wire.
Answer:
Electrons would easily move through the person if there was no rubber around the wire.
Explanation:
The black rubber material is an insulator and will not allow the conduction of heat or electrical current through it. Electrical currents are generated by the movement of electrons through materials.
Hence, if there was no rubber covering around the power cord, the person that plugged-in the power cord would have experienced electric shock because electrons would easily move through him/her from the wire.
please help me with this, thank you so much
Factors that affect climate:
List and describe 2 factors that cause climate.
Factor 2
Factor 1:
HELPPP
Which of the following reactions is an example of a single replacement reaction?
Select one:
a. H2 + O2 --> H2O
b. CH4 + O2 --> CO2 + H2O
c. NaI + Br2 --> NaBr + I2
d. H2CO3 --> H2O + CO2
Answer:
C
Explanation:
Single replacement reactions is when only one element gets replaced / changed. This usually looks like this: A + BC = B + AC or A + BC = C + AB
Therefore, the number of reactants must be equal to the number of products, since no actual combinations / break ups are occurring.
Answers A and D are eliminated right away since the number of products don't equal the number of reactants.
Answer B is wrong because it does not show simply one element being replaced, instead, two compounds are being formed. It doesn't look like the example given.
Only answer C shows that one element is replaced:
The iodine is replaced with bromine to form NaBr + I2
The chemical equation NaI + Br₂ --> NaBr + I₂ is an example of single replacement reaction.
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.
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Which of the following is created when solids, liquids, or gases mix with one another?
a
Mixture
b
Element
с
Compound
d
Pure substance
Answer:
a . Mixture
Explanation:
When solids, liquids and gases mix with one another, the product is usually a mixture.
Mixtures are classified as impure substances because:
their composition is indefinitetheir constituents retains their identityconstituents reacts differently to changed conditionsthey can easily be separated into constituents by physical methodsPure substances are elements and compounds with typically definite compositions.
So, when substances in different phases combines, an heterogeneous mixture is produced.
Please help me answer this fast. I will give brainliest!
Clouds are formed when
1.sunlight causes water droplets to evaporate
2.liquid water condenses on grass and windows.
3.raindrops freeze into tiny pellets and fall to earth.
4.water vapor in the air condenses to form liquid water or ice.
Answer:
D. Water vapor in the air condenses to form liquid water or ice
Explanation:
took test on e2020
What is the relationship of matter to elements?
Some matter use elements others do not.
All matter is made of some type of elements.
Some elements have matter.
Elements do not have matter.
Answer: Matter is made of atoms. Solids, liquids, gases, and plasma are all matter. When all atoms that make up a substance are the same, then that substance is an element. Elements are made of only one kind of atom.
Explanation:
Which of the following objects has polarity?
A
the Earth, which has magnetic north and south poles
B
the city of Chicago, which has a North and Southside
C
a map of the country, which has a compass pointing north
D
an unmagnetized block of metal, which has a top and a bottom
Answer:
D
An unmagnetized block of metal, which has a top and a bottom
Bromine and nitrogen combine to form nitrogen tribromide (NBr3). How many liters of NBr3 gas are produced when 6.85 L of bromine reacts with excess nitrogen? Assume conditions are at STP.
Answer:
4.567 ltr
Explanation:
both are gases
so
N2 +Br2 =NBr3
balancing
N2 +3B2 = 2 NBr3
now
3 litr of B2 gives 2 liter of NBr3
6.85 litr of B2 gives 2/3 *6.85 litr NBr3 = 4.567ltr
Dax has been learning about chemical reactions, and he now understands that chemical reactions occur at different rates. Some are very fast, while others are quite slow. Depending on the conditions, a particular reaction can happen at different rates. Describe the conditions that affect the rate of a chemical reaction
Answer:
concentrationtemperaturesurface area (for solid reactants ONLY)pressure (for gaseous reactants ONLY)catalystExplanation:
Concentration- rate of the reaction increases with the increase of concentration of the reactants. More particles per unit volume leads to the frequency of collisions to increase. The number of successful collisions thereby increase and overall, lesser time is needed to complete the reaction (upon a higher concentration)Temperature- With the increase of temperature, rate of reaction increases. Particles have more kinetic energy and they move faster. Due to this, number of successful collisions increases/number of effective collisions increases. More particles have energy greater than the activation energy and, activation energy can't change. If number of moles are changed, then number of product will vary.Surface Area- Rate of reaction increases with the increase of surface area of the solid reactant. More particles are exposed to react and the frequency of collisions increases. Less time is needed to complete the reaction and with the decrease of size, surface area increases.Pressure- Rate of reaction increases with the increase of pressure of the gaseous reactants. Gas molecules are closer/ more particles per unit volume is found. The frequency of collisions increase and number of effective collisions increases.Catalyst- Substances which can speed up a chemical reaction by lowering the activation energy by creating an alternative route are called catalysts. They take part in a chemical reaction but after the reaction, they remains chemically unchanged. Catalysts can change the value of enthalpy change and increases both forward and backward reaction rates. They can't change the yield of a chemical reaction and can't change the equilibrium composition. (ex: usage of Vanadium (V) Oxide to manufacture sulfuric acid).Any factor that increases the Collison rate definitely increase the rate of reaction, concentration, temperature, surface area, pressure and catalyst are the major factor that affect the rate of reaction.
What is rate of reaction?The rate of reaction is the study of change of concentration of reactant or product with respect to time.
There are so many factors that affect the rate of reaction
1)concentration: As the concentration of reactant increases the number of collisions increases so rate of reaction also increases.
2)temperature: As the temperature increases the movement of gaseous molecule increases hence the Collison rate increases and hence the rate.
3)surface area (for solid reactants ONLY): As the surface area of the catalyst increases, more molecule can sit on the reactive site hence more is the rate of reaction.
4)pressure (for gaseous reactants ONLY): As pressure increases the randomness increases and hence the Collison and hence the rate of reaction
5)catalyst: Catalyst increase the rate of reaction as they decrease the activation energy
Thus concentration, temperature, surface area ,pressure and catalyst are the factor that increases rate of reaction
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the periodic table of elements has all the elements except for...?
Answer:
In the periodic table of the elements, it is expected to be an s-block element, an alkali metal, and the first element in the eighth period. It is the lightest element that has not yet been synthesized.
...
The ion that is formed when alkalis dissolve in water is
A:h+
B:OH+
D: Na-
C:Cl-
Answer:
OH- as alkalis produce hydroxide ions when dissolve in water
which of the following statements about matter is false?
a.) Atoms are the smallest units of matter that maintain their chemical identity.
b.) Heterogeneous mixtures are not uniform throughout.
c.) Homogeneous mixtures cannot be separated by physical means.
d.) A compound is a pure substance composed of two or more chemically bonded ator
Answer:
Heterogeneous mixtures are not uniform throughout.
Explanation:
Heterogeneous mixtures are not uniform throughout.
How many grams of carbon dioxide are produced when 191 g of methane (CH4) are burned completely down as shown in the reaction below:
CH4+2O2--->CO2+2H20
Answer:
Mass = 525.36 g
Explanation:
Given data:
Mass of CO₂ formed = ?
Mass of CH₄ burned = 191 g
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of CH₄:
Number of moles = mass/molar mass
Number of moles = 191 g/ 16 g/mol
Number of moles = 11.94 mol
Now we will compare the moles of CH₄ and CO₂.
CH₄ : CO₂
1 : 1
11.94 : 11.94
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 11.94 mol × 44 g/mol
Mass = 525.36 g
In the early part of the 20th century, what did geologists use to figure out the interior of the Earth ?
Answer:
In the early part of the 20th century, geologists studied the vibrations (seismic waves) generated by earthquakes to learn more about the structure of the earth's interior. They discovered that it is made up of these distinct layers: the crust, the mantle, and the core.
I clean six ninths in my room and my friend clean two ninths in my room how much of my room do we still have the queen
Answer:
1 ninth of the room
Explanation:
PLEASE HELP ME ANSWER
Answer: the second one multiplication
Explanation:
can someone pls help :/
Answer:
option C. Addition of protons to the atomic nucleus.
Explanation:
Elements are fundamentally made up of atoms. Atoms in turn has three sub particles.
These particles are; neutrons, electrons and protons.
The sub particles responsible for the mass of an atoms is basically the protons and neutrons. Going through the options;
The correct option is option C. Addition of protons to the atomic nucleus.
What is the chemical formula for aloe vera gel (or just aloe vera)?
Answer:
Aloeride is a polysaccharide that comprises only 0.015% of the crude A. vera juice material (dry weight). It has a molecular weight between 4 and 7 million Da with its glycosyl components containing glucose (37.2%), galactose (23.9%), mannose (19.5%) and arabinose (10.3%).
Answer:
Aloeride is a polysaccharide that comprises only 0.015% of the crude A. vera juice material (dry weight). It has a molecular weight between 4 and 7 million Da with its glycosyl components containing glucose (37.2%), galactose (23.9%), mannose (19.5%) and arabinose (10.3%).
Explanation:
calculate the mass of 120cc nitrogen present at STP. how many number of molecules are present in it?
Answer:
[tex]0.15008\ \text{g}[/tex]
[tex]3.23\times 10^{21}[/tex]
Explanation:
1 mol of nitrogen at STP = 22.4 L = 22400 cc
n = Mol of [tex]N_2[/tex] = [tex]\dfrac{120}{22400}=0.00536\ \text{mol}[/tex]
M = Molar mass of [tex]N_2[/tex] = [tex]28\ \text{g/mol}[/tex]
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Mass of [tex]N_2[/tex] is
[tex]m=nM\\\Rightarrow m=0.00536\times 28\\\Rightarrow m=0.15008\ \text{g}[/tex]
Mass of the nitrogen is [tex]0.15008\ \text{g}[/tex]
Number of molecules is given by
[tex]nN_A=0.00536\times 6.022\times 10^{23}=3.23\times 10^{21}\ \text{molecules}[/tex]
The number of molecules present in it are [tex]3.23\times 10^{21}[/tex]
A pipe leaks water at a rate of 1.24 mL/s. What is the rate of the water leak in L/hr?
Select one:
a)0.344 L/hr
b)4.46 L/hr
c)0.0744 L/hr
d)20.7 L/hr
Answer:
b)4.46 L/hr
Explanation:
To solve this question we need to convert the mL to liters (Using the conversion of 1000mL = 1L) and convert the time from seconds to hours (3600s = 1hr)
mL to L:
1.24mL/s * (1L / 1000mL) = 0.00124L/s
seconds to hours:
0.00124L/s * (3600s / 1hr) = 4.46L/hr
Right answer is:
b)4.46 L/hrE
Which materials are moved by runoff?
nutrients
vegetation
O large rocks
O paved surfaces
Answer:
Nutrients
Explanation:
Materials that are moved by runoff nutrients.
What is the meaning of Nutrients?A substance that provides nourishment essential for the maintenance of life and for growth. A chemical compound (such as protein, fat, carbohydrate, vitamin, or mineral) contained in foods. These compounds are used by the body to function and grow.
Nutrients are the components found in our food such as carbohydrates, vitamins, minerals, fats, etc. These components are necessary for living organisms to survive. Plants produce their own food while animals and human beings do not produce their own food.
Therefore, Materials that are moved by runoff nutrients.
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to sum up the question: why are some parts of the body more sensitive than others?
please help! if u help i’ll give u
brainliest answer :)
Answer:
Some areas of the body are more sensitive than others because they have more nerve endings. It hurts when you bite your tongue because the sides of your tongue have a lot of nerve endings that are very sensitive to pain! The tongue, lips, and fingertips are the most touch-sensitive parts of the body. The parts of your skin that need to be most sensitive like your fingertips and your lips have more receptor cells in them than others less sensitive areas. The least sensitive skin on the human body is found in the heel area. This is because there are very few nerves in the heel to feel things. If there were too many nerves in our heels then walking would be far too painful.
Explanation:
Answer: Some parts of the body are more sensitive than others because they each play an important role. For example, it hurts to bite your toungue because it has a lot of nerves.
Explanation:
Match each type of learning to the correct definition
trial-and-error learning
the process of performing a behavior more
and more skillfully
imprinting
insight learning
the process of associating a stimulus with a
good or bad outcome
a bond to an individual or object shortly after
birth or hatching
the process of using prior knowledge to
solve a problem
conditioning
Answer:
conditioning-the process of associating a stimulus with a good or bad outcome.
trial-and-error learning-the process of performing a behavior more and more skillfully.
insight learning-the process of using prior knowledge to solve a problem.
imprinting-a bond to an indivisual or object shortly after birth or hatching.
Explanation:
Did this assignment.
Answer:
Insight learning=2 one
conditioning=4th one
Imprinting=1st one
Trial-and-error learning=3rd one
(If urs is not in the same order here is the written one)
Insight learning-the process of using prior knowledge to solve a problem
Conditioning-the process is associating a stimulus with a good or bad outcome
Imprinting-a bond an individual or object shortly after birth or hatching
Trial-and-error learning-the process of performing a behavior more and more skillfully.
Explanation: hope it helps got it right on edu 2021
