Answer:
The two different methods to help identify the species of insects from the eggs on human remains are by using a small paint brush dipped in water and the other way is by using forceps.Explanation:
mark as brainliestThe insects have been defined as the most successful arthropods. There are far more species in the class Insecta than in any other group of animals. The insects are the only invertebrates with wings.
What are insects?The insects play a very important role in the web of the life in every environment. Their jobs include pollinating flowering plants, since it is the source of food for insectivorous animals and it assist in the decomposition of plants and animals.
The two different methods which help to identify the species of the insects from the eggs on human remains are by using a small paint brush dipped in water and the other way is by using the forceps.
The study of insects and their life cycle are found to be important for the forensic entomologist. This is because it could set a timeline on when the crime is happened. The life cycle of a blowfly starts as an egg and then goes to be maggots.
To know more about insects, visit;
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State the name of the ion which is oxidised in the following half equations. Cathode: Na+ + e– → Na Anode: 2Cl– → Cl2 + 2e–
Answer:
hahahahhahhhahahaha
Explanation:
haahahahahhahahhaha
What mass of iron is formed when 240 g of iron(III) oxide reacts completely with carbon monoxide?
Answer:
168 g
Reaction:
[tex]Fe_{2}O_{3} + 3 CO >>> 2 Fe + 3CO_{2}[/tex]
Explanation:
First we need to figure out what is the formula mass (Mr) of Fe2O3 (Iron(III) oxide).
The atomic mass of Fe=56, O=16
Mr= 56+56+16+16+16=160 g/mol
We can now figure out the moles of the iron:
240/160 = 1.5 mol
Then we need to find the ratio to make Fe.
In the reaction, we know that 1 mole of Fe2O3 can make 2 moles of Fe. So 1.5 moles of Fe2O3 can make 3 moles of Fe.
And then we need to find the mass of the Fe.
3×56=168 g.
Hence 168g of the iron is made after the reaction.
a. An undesirable constituent of air
Complete Question:
Give one word for the following.
a. An undesirable constituent of air
b. The constituent of air that helps in burning
c. The thick layer of air surrounding the earth
d. Carbon dioxide does not support this process
Answer:
a. Pollutant.
b. Oxygen.
c. Atmosphere.
d. Combustion.
Explanation:
a. Pollutant: an undesirable constituent of air. Pollution can be defined as the physical degradation or contamination of the environment through an emission of harmful, poisonous and toxic chemical substances known as pollutants. Some examples of pollutant are carbon monoxide, nitrogen dioxide, ozone, etc.
b. Oxygen: the constituent of air that helps in burning. Oxygen is an element that aids in the combustion (burning) process because it is an oxidizing agent.
c. Atmosphere: the thick layer of air surrounding the earth. It comprises of nitrogen, oxygen, carbon dioxide, argon and other gases in very small proportion.
d. Combustion (burning): Carbon dioxide does not support this process but it is an end product of the process.
Combustion can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
Unicellular organisms are so small that you usually need a telescope to see them.
True
False
Answer:
true ........
hope it is helpful
Hey. Can someone, please help me with the following questions:
Satellites
Satellites ___________the earth.
You can see _____________ _______________ without a telescope.
An example of a man made satellite is the _____________ _____________ _____________.
The only natural satellite of the earth is the __________.
Choose from: moon, orbit, natural satellites, international space station
Planets
There are ________ planets you can see with the __________ __________.
The five planets are, _________, ___________, ___________, ___________, ___________.
The planets are part of the ___________ ___________.
Light from Saturn takes around ___________ hours to reach earth.
Choose from: 1,5, naked eye, solar system, Mercury, Venus, Mars, Jupiter, Saturn
Comets and Meteors
A _________ is a spectacular sight in the _________ sky.
They are _______ to see and could be described as giant ___________ that orbit the _______.
__________ are bits of dust and _________ that _______ up as they move through the earth’s ____________. A meteor that makes it to earth is called a ______________.
Galaxies
1. What are most of the dots of light that we see in the sky?
2. What is the name of our home galaxy?
3. What is the name of our nearest star?
4. How long does it take the light from the sun to reach the earth?
5. Can you say what some of the other dots of light in the night sky might be?
6. How many stars might there be in one galaxy?
7. What is the name of our nearest neighbor galaxy?
8. State how long it takes for the light from our neighbor galaxy to reach the earth
HELP ME PLEASEEEEE!!!!!!!!!!
Answer:
I dont know what the answer is
Explanation:
what is the correct terms for atom with a full valence shell?
Answer:
octet rule
Explanation:
What is the mass percent of carbon in glucose, C6H1206?
Answer:
40%
Explanation:
hope this helps!!!!
How many moles are there in 105.69 grams of FeCI2
Answer:
0.8338395752301793
Explanation:
I used an online converter (grams to moles for FeCl2)
Shontal compared some of the properties of a marble to a piece
of wood. She placed a marble and a piece of wood in a bucket filled
with water. Shontal observed the wood floating on top of the water,
but the marble sank to the bottom of the bucket. Which statement
best explains why the marble and piece of wood acted differently in
the water?
Answer:
I can't see your answer choices, but it would be something that related to density of the marble vs. wood.
Explanation:
Density is mass divided by volume. A marble with a greater density than water will sink, and wood with lower density than water will float.
A cube of steel with a mass of 150 grams is heated from 60°C to 150°C.
Use calorimetry to determine the amount of energy absorbed by the
metal. The specific heat capacity of steel is 0.466 J/g°C.
Answer:
1.
The energy lost by the water is given by:
where
m = 3.0 kg = 3000 g is the mass of water
Cs = 4.179 J/g•°C is the specific heat
is the change in temperature
Substituting,
2.
The energy added to the aluminium is given by:
where
m = 0.30 kg = 300 g is the mass of aluminium
Cs = 0.900 J/g•°C is the specific heat
is the change in temperature
Substituting,
4. 42.9 g
The mass of the water sample is given by
where
is the heat added
is the temperature change
Cs = 4.179 J/g•°C is the specific heat
5. 115.5 J
The heat used to heat the copper is given by:
where
m = 5.0 g is the mass of copper
Cs = 0.385 J/g•°C is the specific heat
is the change in temperature
6. 0.185 J/g•°C
The specific heat of iron is given by:
where
Q = -47 J is the heat released by the iron
m = 10.0 g is the mass of iron
is the change in temperature
Substituting,
Substituting,
Substituting,
Explanation:
a 31 g sample of a compound that contained only
The question is incomplete, the complete question is;
A 31 g sample of a compound that contains only the elements C,H and N is completely burned in O2 to produce 44.0 g of CO2, 45.0 g of H2O, and 92.0 g of NO2. Determine the empirical formula of the compound.
Answer:
CH5N2
Explanation:.
Mass of C = 44.0g/44.0 g/mol = 1 mol * 1 = 1 mole of C
Mass of H = 45.0 g/18 g/mol = 2.5 moles * 2 = 5 moles of H
Mass of N = 92.0 g/46 g/mol = 2 moles * 1 = 2 moles of N
Dividing through by the lowest mole ratio;
1/1, 5/1, 2/1
1 : 5 : 2
Hence the empirical formula is;
CH5N2
I NEED HELP PLZZ THX <3
Question 16
A hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.
What happens according to Newton’s first law of motion?
A) The puck does not lose any speed because ice is a very slippery surface.
B) The puck gradually slows down because mass makes objects slow down.
C) The puck gradually slows down because friction would be acting on it.
D) The puck does not lose any speed because once an object starts moving, the force of friction would no longer apply to it.
Answer:
C) The puck gradually slows down because friction would be acting on it.
Explanation:
It would be C because the puck would be scraping the ice and when it's scraping it slowly losses its speed because the ground is pushing it lightly
Hoped that helped :/
What causes an object to have a positive charge?
what happens when bromine water is added to ethane and ethene
Answer:
Bromine water reacts with ethane as it is able to break open the double bond, forming 1,2-dibromoethane. This double bond is not present in ethane, so bromine water does not react with it. This reaction is known as electrophilic addition.
Explanation:
Ethene will readily react with bromine, so the colour of the bromine water changes from red-brown to colourless. Bromine atoms will add across the double bond in ethene to produce just one product; 1,2-dibromoethane.
If water is added to 145 mL of a 0.55 M KOH solution until the volume is 250 mL, what will the molarity of the diluted solution be?
Answer:
0.319 M
Explanation:
M1V1 = M2V2
M1 = 0.55M
V1=145 mL = 0.145 L
V2 = 250mL = 0.250L
M2 = M1V1/V2=0.55x0.145/0.250 = 0.319 M
I need someone to help me awnser is you have a min
Ms. Gratz went outside last night and saw a full moon as shown:
Which moon phase would she see next?
0.32 moles of oxygen gas has a temperature of 27°C and pressure of 2 atm in a closed container. What is the volume?
Answer:
3.9 L
First convert temperature to Kelvin
then use the ideal gas law
use algebra to solve for V
Since your solving for volume, your answer should be in Liters.
Which is the Net Ionic Equation for:
(remember, the Net Ionic Eq. shows ALL of the PARTICIPANTS)
2FeCl3(aq) + 3Mg(s) ® 3MgCl2(aq) + 2Fe(s)
2Fe3+ (aq) + Cl3- (aq) + 3Mg(s) ® 3Mg3+ (aq) + Cl2- (aq) + 2Fe(s)
2Fe3+ (aq) + 6Cl- (aq) + 3Mg(s) ® 3Mg2+ (aq) + 6Cl- (aq) + 2Fe(s)
Answer: [tex]2Fe^{3+}(aq)+3Mg(s)\rightarrow 3Mg^{2+}(aq)+2Fe(s)[/tex]
Explanation:
Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and are present in an aqueous state and represented in the form of ions.
Net ionic equation : In the net ionic equations, we do not not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The complete balanced ionic equation will be:
[tex]2Fe^{3+}(aq)+6Cl^-(aq)+3Mg(s)\rightarrow 3Mg^{2+}(aq)+6Cl^-(aq)+2Fe(s)[/tex]
In this equation, [tex]Cl^-[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be:
[tex]2Fe^{3+}(aq)+3Mg(s)\rightarrow 3Mg^{2+}(aq)+2Fe(s)[/tex]
Calculate how many molecules are in 25.1 grams of N2.
answer choices:
1. 1.08 x 10^24 molecules N2
2. 6.02 x 10^23 molecules N2
3. 6.31 x 10^22 molecules N2
4. 5.39 x 10^23 molecules N2
how many carbon dioxide molecules are produced if 8.45 x 1023 of water molecules of water are produced
The given question is incomplete. The complete question is:
Determine how many carbon dioxide molecules are produced if molecules of water are produced
[tex]C_2H_6(g)+O_2 (g)\rightarrow CO2(g)+H_2O(g)[/tex]
Answer: [tex]5.60\times 10^{23}[/tex] molecules of carbon dioxide are produced
Explanation:
The balanced chemical equation is:
[tex]2C_2H_6(g)+7O_2 (g)\rightarrow 4CO2(g)+6H_2O(g)[/tex]
[tex]\text{Moles of water}=\frac{\text{given molecules}}{\text{Avogadros number}}=\frac{8.45\times 10^{23}}{6.023\\times 10^{23}}=1.40moles[/tex]
Accoding to stoichiometry:
6 moles of water are produced along with = 4 moles of carbon dioxide
Thus 1.40 moles of water are produced along with = [tex]\frac{4}{6}\times 1.40=0.93[/tex] moles of carbon dioxide
Molecules of carbon dioxide = [tex]moles\times {\text {Avogadros number}}=0.93\times 6.023\times 10^{23}=5.60\times 10^{23}[/tex]
When you push or pull something, you are creating
force but could be tension
Your car burns gasoline as you drive from home to school
DIMENTIONAL ANALYSIS!
‼️ASAP!!! BRAINLIEST!!‼️
PLS HELP!!! SHOW ALL WORK + STEPS!! Thx!
Answer:
1037.56 mph
Explanation:
We are told the distance around the earth which is the circumference is 40075 km.
Converting to miles gives 24901.451 miles
Formula for speed = distance/time
Time for one rotation is 24 hours.
Thus, speed = 24901.451/24 = 1037.56 mph
A sample of oxide iron weighing 2.40g was heated in a stream of hydrogen until it was completely converted to the metal. If the metal weighed 1.68g. What is the formula of the iron oxide? (Fe=56, O=16)
Answer:
Fe₂O₃
Explanation:
To solve this question we must find the moles of Iron in 1.68g. With the difference of the masses we can find the moles of oxygen. The formula will be obtained with the ratio of both amount of moles:
Moles Fe:
1.68g * (1mol / 56g) =0.03moles
Moles O:
2.40g-1.68g = 0.72g * (1mol/16g) = 0.045moles
The ratio O/Fe is:
0.045moles / 0.03moles = 1.5 moles. this ratio is obtained if the formula is:
Fe₂O₃How many molecules are in 1 mole of molecules?
Answer:
6.022x10^23
Explanation:
HELP PLEASE!! IF YOU DO AND ANSWER CORRECTLY YOU WILL GET A BRAINLIEST 5 STARSSSS AND A THANKS!! PLEASE PLEASE HELPPP
When scientists communicate about their work, what information should they make sure is included:
1.
2.
3.
4.
5.
6.
7.
I will give any one Brainliest, Thanks, & a 5 rating who can Guess my Top 2 Phobia's.
I will give 1 hint for each though...
1st phobia hint is we creep & crawl everywhere we may be small but some people get scared.
2nd phobia hint is things that life is gone and no longer breathes
Answer:
scared of bugs and dead things, or death itself?
Answer:
scared of bugs and dead things, or death itself?
Explanation:
How many water molecules are in 5.2 moles of H20?
Answer: There are therefore 6.02 × 1023 water molecules in a mole of water molecules.
Explanation: Hope this helps