Answer:
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z). Hope This Helps
Explanation:
What is Redox reaction? What is oxidized, reduced, oxidizing, and reducing agent?
Answer:
Explained below.
Explanation:
- Redox reaction is defined as any type of chemical reaction whereby the oxidation number of a participating chemical atoms/elements undergo changes.
- The atom that is oxidized is the one that has an increase in it's oxidation number.
- The atom that is reduced is the one that has a decrease in its oxidation number.
- The reducing agent is defined as the atom that is oxidized.
- The oxidizing agent is defined as the atom that is reduced.
Why is overuse of resources a problem ?????
Answer: the overuse of resources will lead to a decline of the resources, the question was a little non specific so this was the best I could do :)
Explanation:
What is the percent by mass of fluorine in CaF2?
65%
24%
49%
51%
The percentage of fluorine in the given compound is 49%.
The given compound;
CaF₂
The molecular mass of the given compound is calculated as follows;
CaF₂ = (40) + (19 x 2)
= 40 + 38
= 78 g/mol
The mass of fluorine in the given compound = 38 g/mol
The percentage of fluorine in the given compound is calculated as follows;
[tex]= \frac{38}{78} \times 100\%\\\\= 48.7 \%\\\\\approx 49\%[/tex]
Thus, the percentage of fluorine in the given compound is 49%.
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What is the concentration of a salt water solution with 15 grams of salt in 100 mL of water?
A. 10%
B. 5%
C. 20%
D. 15%
This problem is providing the mass of salt, 15 g, that is dissolved in 100 mL of water, so its concentration is required and found to be 15 % according to the following calculations:
By mass percent:In chemistry, units of concentration in solutions are used to represent the relative amount of a solute that is dissolved in a solvent. Thus, in this case, we refer to a salt-water solution, whose concentration is calculated via:
[tex]\% m=\frac{m_{salt}}{m_{water}}*100\%[/tex]
In such a way, given the mass of salt, 15 g and volume of water, or solution, 100 mL, one obtains the following:
[tex]\% m=\frac{15g}{100g}*100\% \\\\\% m=15\%[/tex]
Learn more about by mass percent: https://brainly.com/question/5394922
Answer:
D) 15%
Explanation
Calculate AH for the following reaction.
C2H4(g) + H2(g) → C2H6(g)
(ΔHf° for C2H4(g) = 52.5 kJ/mol; ΔHf° for C2H6(g) = -84.7 kJ/mol)
a. -137.2 kJ
b. -32.2 kJ
c. 32.2 kJ
d. 137.2 kJ
Answer:
a.-137.2 kJ
Explanation:
If the first example symbol used is addition you can copy the plus and follow it how to solve the next!And also if the negative or positive sign.
what refers to the effect of gravity
on an
object?
A. mass
B. matter
thing
C. volume
D. weight
Answer: D
Explanation:
Weight by definition is mass multiplied by the acceleration of gravity. So, weight is the force of gravity
Which of the 3 molecules: Methane, Propane, Butane would release the most energy when combusted?
Answer:
butane
Explanation:
what is 412.12 reduced to two significant figures?
Answer: 410
Explanation:
Drop the retaining numbers 1 and 2 after the decimal and then round the 2 in 412 to 0 because any number less than 5 rounds to 0. 0 shouldn’t count as a sig fig.
5. How would the food web in Figure 7 change if the numbers of red foxes were
greatly reduced by hunters?
Help meee
Answer:
I cant help you because you didn't provide a picture for the graph
Explanation:
2. When two oppositely charged particles are brought near each other, they produce a torceted the stone
shows the force around two changed particles
Which force do the arrows represent?
A an unbalanced force
B. a frictional force
C.an electrical force
D.a gravitational force
Answer:
A
Explanation:
An unbalanced force is your answer.
Which of the following is not a part of the digestive system
A. Mouth
B.Esophagus
C.Intestines
D.Kidneys
Answer:
Kidneys •_•
Hope this helped <3
How many grams are in 3.1 moles of aluminum oxide?
0.03g
316.08g
32.89g
Answer:
316.08g
How many moles Al2O3 in 1 grams? The answer is 0.0098076450122103. We assume you are converting between moles Al2O3 and gram. You can view more details on each measurement unit: molecular weight of Al2O3 or grams This compound is also known as Aluminium Oxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Al2O3, or 101.961276 grams. Note that rounding errors may occur, so always check the results.
explain the geological process that results in the formation of minerals!!
will give brainly!
Answer: The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic, in which
Explanation:
Answer:
The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic.
What is the average speed of 3043 km from houston to seattle in 5.5 hours rounded to the nearest hundredth
Answer:
The average speed is 553.27[tex]\frac{km}{hour}[/tex]
Explanation:
Speed is the physical magnitude that shows and expresses the variation in position of an object and as a function of time. In other words, the speed relates the distance traveled by an object in the unit of time.
The average speed is the quotient of the space traveled by an object and the time it takes to cover the path:
[tex]speed=\frac{distance}{time}[/tex]
In this case:
distance: 3,043 kmtime: 5.5 hoursSo, replacing in the definition of speed:
[tex]speed=\frac{3,043 km}{5.5 hours}[/tex]
Solving:
speed= 553.27[tex]\frac{km}{hour}[/tex]
The average speed is 553.27[tex]\frac{km}{hour}[/tex]
Which of these would be a good insulator of electricity?
Group of answer choices
Steel
Rubber
Copper
Aluminum
Answer:
Rubber
Explanation:
Answer:
copper
Explanation:
what type of reaction is Fe(NO3)3 + 3NaOH → Fe(OH)3 + 3NaNO3
Answer:
it's a double displacement reaction
Explanation:
Why the recombinant DNA is reintroduced into the bacterium?
-HELP-
How many molecules are contained in 125 grams of oxygen gas (O2)?
Answer:
62.50
Explanation:
I divided the 125 in the result is 62.50 but it is considered a 62.
never mine:)
[tex]125gms[/tex] of oxygen gas contains [tex]2.35\times 10^{24}[/tex] molecules of oxygen.
The molecular weight of oxygen[tex]=16[/tex]
Therefore,[tex]O_2=2\times 16\\=32[/tex]
No.of Moles of oxygen in 125g is,
[tex]\frac{125}{32}=3.9 g[/tex]
1mole of oxygen contains [tex]6.023\times10^23 molecules[/tex]
No.of oxygen molecules in 3.9 g of oxygen is,
[tex]3.9 \times 6.023 \times10^23=2.348 \times 10^24[/tex]
Which can be roundoff and written as [tex]2.35 \times10^{24}[/tex]
Therefore, 125gms of oxygen gas contains [tex]2.35 \times10^{24}[/tex] molecules of oxygen.
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Please help!! And quick 3. Which team will push the box farther?
Team 1 Team 2 5 N
5 N
5 N 5N
12 N
I
Answer:
team 25 N because the force is more
Which PAIRS below are PHASE CHANGES that occur at the same temperature? (Choose the 2 correct statements.) *
Freezing and Condensation
Freezing and Melting
Vaporization and Condensation
Melting and Vaporization
Answer:
I would say C and D
Explanation:
Hope this helps my good friend :)
According to the forces of attraction, the phase changes that occur at the same temperature are vaporization and condensation, melting and vaporization .
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
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Something that helps us to understand things that are too large or too small are called A. atoms B. molecules C. models D . compounds
What are the three components of soil texture?
Hurry please help!
Answer: sand, silt, and clay.
Question 1 of 10
What do biologists study?
A. Living things
B. The properties of light
C. The properties of matter
D. How matter and energy interact
SUBMIT
Answer:
A
Explanation:
Biology is the study of living things.
Is the following statement true or false:
Cellular respiration only occurs in animal cells.
Question 1 options:
True
False
Answer:
False
Explanation:
Humans and plans do it as well
Answer:
False
Explanation:
Cellular respiration takes place in the cells of all organisms. It occurs in autotrophs such as plants as well as heterotrophs such as animals.
A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below. Nucleus Nucleus Atom 1 Atom 2 Nucleus Nucleus Atom 3 Atom 4
Answer:
atom 1 and atom 2
Explanation:
what is the generic equation for a combustion reaction?
Answer:
The generic equation for a combustion reaction is AB + O2 à AO + BO
Explanation:
25. Complete the following nuclear reaction: (2 pts)
- 92 U → 4-2He + 231 - Th
Answer:
7
Explanation:
An unknown substance with a mass of 83 grams absorbs 1,108 J while undergoing a
temperature increase of 11 °C. What is the specific heat of the substance?
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
The specific heat of the substance is 1.21 [tex]\frac{J}{g*C}[/tex]
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:
Q = c*m*ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
Q=1108 J c= ? m= 83 g ΔT= 11 CReplacing:
1108 J= c*83 g* 11 C
Solving:
[tex]c=\frac{1108 J}{83 g* 11 C}[/tex]
c= 1.21 [tex]\frac{J}{g*C}[/tex]
The specific heat of the substance is 1.21 [tex]\frac{J}{g*C}[/tex]
____________ acceleration involves speeding up, while ____________ acceleration involves slowing down. a. positive, negative c. positive, braking b. negative, positive d. both a and c
Answer:
Positive acceleration involves speeding up, while negative acceleration involves slowing down.
Explanation:
I am so sorry if I was wrong!
Answer:
no just no
Explanation:
Is it better for people to learn from others, or is it better for people to learn on their own? {thesis statement} {subject: Writing}
Answer:
on your own?
Explanation:
it sticks better in your head once you fail
im sorry i dont know this i really need points for my maths test
Answer:
It depends on the situation. Most things are better learning from others because others can see what you cant. On the other hand there are some situations were only you can learn from. Take pain as an example. Others can talk about pain as much as they would like but your body dosent know what that feels like unless it feels it on its own and learns from it. An example of learning from others would be smarts such as math, science, history and so forth.
Explanation: