Answer:
Explanation:
6 electrons
carbon dioxide, C has atomic number 6 so it has 6 electrons and oxygen has atomic no 8, i.e 16 electrons.
What is the mass number of an atom that has 12 neutrons and 11 protons?
24
12
11
23
Answer:
23
Explanation:
If a screwdriver was used to pry open a door, where would scratches/striations be found?
Answer: Most likely around the knob area or by the bolts that hold the door up.
Explanation:
If you attempted to pry open a locked window with a screwdriver, the screwdriver would leave a tool mark on the window and windowsill.
The impressions made by a tool when it comes in contact with an object are called as tool marks. These tool marks exhibit a variety of impressions depending upon the type of tool, its shape and its use. They are classified into different types depending upon the force with which they are made.
The study of tool marks is very useful in forensic science which includes information about the analysis of tool marks at the crime scene and in the laboratory, the interpretation and assessment of challenges for examination and interpretation and also the way in which tool mark evidence can be presented in a courtroom.
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2NaCl is a....
(Mulititple choice)
Answer:
Coffeicent
Explanation:
I think this would help you
Describethe role of trees and photosynthesis in the carbon cycle
Answer:
Tree's absorb so much carbon dioxide from the atmosphere and store the carbon in their biomass
4) When solid sodium nitrate is heated, solid sodium nitrite and oxygen gas
(02) are produced. Write the balanced chemical equation for this chemical
reaction using the correct chemical formulas and include conditions (s, l, g, or
aq). Put your answer in the box below.
Write the balanced chemical equation and state what type of chemical reaction this is.
Answer: The balanced chemical equation is [tex]2NaNO_{3}(s) + Heat \rightarrow 2NaNO_{2}(s) + O_{2}(g)[/tex] and it is a decomposition chemical reaction.
Explanation:
A chemical reaction in which single compound is decomposed into two or more species is called a decomposition reaction.
For example, [tex]NaNO_{3}(s) + Heat \rightarrow NaNO_{2}(s) + O_{2}(g)[/tex]
As the compound [tex]NaNO_{3}[/tex] is decomposing to given two different substances. So, it is a decomposition reaction.
Here, the number of atoms on reactant side are as follows.
Na = 1N = 1O = 3The number of atoms on product side are as follows.
Na = 1N = 1O = 4To balance this equation, multiply [tex]NaNO_{3}[/tex] by 2 on reactant side and multiply [tex]NaNO_{2}[/tex] by 2 on product side. Therefore, the equation will be rewritten as follows.
[tex]2NaNO_{3}(s) + Heat \rightarrow 2NaNO_{2}(s) + O_{2}(g)[/tex]
Here, number of atoms on reactant side are as follows.
Na = 2N = 2O = 6The number of atoms on product side are as follows.
Na = 2N = 2O = 6Hence, this equation is balanced.
Thus, we can conclude that the balanced chemical equation is [tex]2NaNO_{3}(s) + Heat \rightarrow 2NaNO_{2}(s) + O_{2}(g)[/tex] and it is a decomposition chemical reaction.
What is the sum of the coefficients for the balanced chemical equation below ?
Answer:
9
[tex]4X \: + \: 3Y _{2} \: → \: 2X _{2} Y _{3}[/tex]
Sum = 4+3+2
=9
Write a formula that you can use in order to calculate the number of neutrons in an atom:
Number of Neutrons=____________________________
Answer:
number of neutrons = mass number - number of protons
A person walks 2 miles in 30 minutes. Figure out how many feet per second they traveled.
Answer:
5.8667 ft/s
Explanation:
how many moles are there in 302 grams of Ca2N2
Answer:
2.0371352212585085
Explanation:
I need this ASAP
A young scientist wants to focus on drug creation. What is one of the first
things he should do?
O A. Look into trends of various diseases and their effects on society.
B. Research available drugs for treating illnesses such as cancer and
heart disease, as well as the side effects of these drugs.
C. Test a composite material in the lab to see how it can be
improved
D. Make a plan for how to conquer a disease with drugs.
Answer:
A :))
Explanation:
They should look into the different types of diseases and their effects on society before anything else so they know what type of drugs he should look into.
(SCIENCE)Which conditions are needed for a hurricane to form?
A.
warm, dry air rising over warm areas on the land
B.
warm, dry air rising over warm areas in the ocean
C.
warm, moist air rising over warm areas on the land
D.
warm, moist air rising over warm areas in the ocean
Answer:
I think the answer is D, but if I'm wrong PLEASE TELL ME!
Explanation:
For one hurricane to form, there needs to be warm ocean water and moist, humid air in the region. When humid air is flowing upward at a zone of low pressure over warm ocean water, the water is released from the air as creating the clouds of the storm. As it rises, the air in a hurricane rotates.
What do greenhouse gases do in our atmosphere?
Explanation:
Greenhouse gases are gases in Earth's atmosphere that trap heat. They let sunlight pass through the atmosphere, but they prevent the heat that the sunlight brings from leaving the atmosphere.
HELP NOW PLEASE NO LINKS HELP ASAP RIGHT NOW.
A dog runs 6 km in 30 minutes. What is the dog’s average speed in km/h?
here's your solution
==> distance covered = 6 km
==> time taken = 30 min
==> time in hour = 30/60 = 1/2hr
= speed = distance/time
==> speed = (6)/(1/2)
==> speed = 12 km/hr
hope it helps
When a dog run 6 km in 30 minutes then dogs average speed will be 12 km/h.
What is average speed?The average speed of something is computed by dividing the number distance travelled by the total time it took to travel that distance. Average speed can be determined by the formula:
V=d/T
where, V is average speed , d is distance and T is time.
It is given that , d= 6 km and T= 30 minutes(0.5 h).
Calculation of average speed is show below:
Now, puts the value of given data in average speed formula.
Average speed(V )= 6/ 0.5 = 12 km/h
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How many moles of hydrogen can be produced with 0.16 moles of water
Answer:
2
Explanation:
A mole is a number of particles equal to the constant of Avogrado (6,02214*10^23). So by talking about moles we are talking about a number of molecules. If we look at the reaction described 2 H2 + O2 → 2 H2O you see that two hydrogen molecules can react whit one oxygen molecule to produce two water molecules. Because a mol is a certain number of molecules it is easy to calculate around chemical reactions. So we have 4 moles of hydrogen, and two moles of oxygen. Enough building blocks to build a total of two moles of water
10. Which of the following consists of two or more pure substances?
A. ice
B. oxygen
C. soda pop
D. ammonia
Complete chemical equation of the reaction between calcium hydrogen carbonate and hydrochloric acid
Answer:
..
Explanation:
Answer:
CaCO3+ HCl -> CaCl2 + CO2 + H2O
Explanation:
Please mark brainliest
What trait of a wave is described by its wavelength?
O
A. The speed and direction that the wave is traveling
B. The distance from one wave peak to the next wave peak
C. The distance from the peak to the bottom of a wave
ОО
D. The number of waves that pass a point in 1 second
Help plisss!!!
Answer:
The distance from one wave peak to the next wave peak
Explanation:
a pex
The trait of a wave that is described by its wavelength is the speed and direction that the wave is traveling. Therefore, the correct option is option A.
Energy is moved around the world in two main ways: mechanical waves as well as electromagnetic waves. Mechanical waves include air and water waves caused by sound. A disruption or vibration within matter, either solid, gas, liquid, and plasma, is what generates mechanical waves.
A medium is described as material through which waves are propagating. Sound waves are created by vibrations inside a gas, while water waves are created by vibrations inside a liquid (air). The trait of a wave that is described by its wavelength is the speed and direction that the wave is traveling.
Therefore, the correct option is option A.
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Can someone pls tell what to put in 6 and 7 pls no links ???
Can someone tell me how to draw a atomic model for Cd
Explanation:
there you go you can just look up atomic model for CD and click images
Unit 3: Energy
3.2 Forms of Energy Worksheet
Watch this Video ,fill the table below and answer the questions.
Form
Description
Type
Example
1.
2.
3.
4.
5.
6.
7.
8. What forms of energy does a burning candle give out?
9. What questions do you have about energy?
Answer:
What forms of energy does a burning candle give out?
The burning candle is converting chemical energy—stored in the hydrocarbon bonds in the wax—into thermal (heat) and radiant (light) energy.What questions do you have about energy?
Can momentum be hidden to human eyes like how kinetic energy can be hidden as heat?Can you go fast enough to get enough mass to become a black hole?How can a material at a certain temperature have all of its molecules at the same energy?How can we travel to the past?whats the molar volume (of a solution)?
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Answer:
Molarity can be used to calculate the volume of solvent or the amount of solute. The relationship between two solutions with the same amount of moles of solute can be represented by the formula c1V1 = c2V2, where c is concentration and V is volume.
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Which term is used to describe a natural change in the sequence of an organism’s DNA?
What is the mass of oxygen gas (O2) needed when 8.75 x 1070 molecules of methane (CH4) combust to form carbon dioxide (CO2)? (Choose closest answer)
CH4 + 2O2 -> CO2(g) + 2H2O
A.
8.43 x 1093 grams
B.
9.299 x 1048 grams
C.
2.32 x 103 grams
D.
9.08 grams
E.
my mom
I can't get this Question can you help me, please :)
Answer:
d.
Explanation:
more heat energy
Calculate the number of moles of Al2O3 that are produced when 1.2 mol of FeO is used in the following reaction.
2Al(s) + 3FeO(s) -> 3Fe(s) + Al2O3(s)
A.
3.6 mol Al2O3
B.
3.6 mol Fe
C.
0.40 mol Fe
D.
0.40 mol Al2O3
E.
0.60 mol Al2O3
F.
2.4 mol Al2O3
Answer:
D
Explanation:
I’ll mark brainliest
What is the most direct evidence in this photo of millions of years of
deposition?
A. The smooth, clear rock layers
B. The mountains in the background
C. The water at the bottom of the canyon
D. Rock that is red in some places
Answer:
The answer is A. Here is proof. Plz mark brainliest.
Explanation:
¿Qué es una fuente de luz secundaria?
Answer:
Las fuentes secundarias son testimonios de segunda mano elaborados con posterioridad a los hechos ocurridos y basados en la información de las fuentes primarias, por ejemplo: libros y revistas, películas, video-documentales, series televisivas, textos escolares y mapas temáticos.
Answer:
Las fuentes de luz secundarias son aquellas que reflejan la luz que produce otra fuente. Por ejemplo: la luz de la luna (refleja la luz que produce el Sol), un espejo.
Explanation:
down there (pls hurryy!!)
Answer:
D. is the correct answer.
Answer:
There are many changes that can increase the rate of chemical reaction but the most significant is
Adding a catalyst to the reaction mixture.
The other changes that can increase the rate of chemical reaction are;
Change in temperature (increasing the temperature)
Change of pressure (higher pressure)
pH of the solution (optimum pH)
Change in concentration (Increasing the concentration of the reactants)
What is the first stage of a lunar eclipse?
The first stage of a lunar eclipse:
Penumbral eclipse.
There are 7 stages of a total lunar eclipse. The first one is when the Penumbral eclipse begins. his begins when the penumbral part of Earth's shadow starts moving over the Moon. This phase is usually not feasible to be seen with the naked eye.