Electromagnetic radiation is a form of energy that propagates as both electrical and magnetic waves traveling in packets of energy called photons. There is a spectrum of electromagnetic radiation with variable wavelengths and frequency, which in turn imparts different characteristics.
This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space. ...
How many grams of hydrogen are in 85.0 g of Ca(OH)2
Answer: 2.30 grams
Explanation: First find how many moles you have:
The molar masses are taken from the periodic table: Ca is 40, O is 16, H is 1. There are two O and 2 H from (OH)2 40+32+2=74 g/mol. Grams (given) x mol/grams (molar mass) = mols, so 85 grams x 1 mol / 74 grams = 1.149 mol. For every mol of Ca(OH)2, there is 2 mol of H so x2 = 2.297 mol H. For every mol of H, there is one gram so 2.297 grams. Rounded to three significant figures you get 2.30 grams.
2.15 mol of hydrogen sulfide, H2S
Remember, the graph in question 1 is a cooling curve. A substance is
changing from a gas to a liquid to a solid. Which model illustrates the
final phase change in this cooling curve?
A) Image A
B) Image B
C) Image C
D) Image D
Consider the following equilibrium: 2 NO2(g) ⇌ N2O4(g) + Energy The equilibrium will shift to left as a result of... — BRAINLIEST will be rewarded to the first to answer with the correct answer.
Answer:
C.
Explanation:
The left side has 2 mols of gas and the right only has 1. Thus increasing volume (decreasing pressure) would shift the reaction to the left
- How much power does it take to lift a
1,000 N load 10 m in 20 s?
Answer:
"500 Joule/sec" is the right answer.
Explanation:
The given values are:
Force,
F = 1000 N
Velocity,
s = 10 m
Time,
t = 20 s
Now,
The power will be:
= [tex]\frac{Force\times Velocity}{Time}[/tex]
On putting the values, we get
= [tex]\frac{1000\times 10}{20}[/tex]
= [tex]\frac{10000}{20}[/tex]
= [tex]500 \ Joule/sec[/tex]
The graph shows the speed of a car
traveling east over a 12 second
period. Based on the information in
the graph, it can be concluded that
in the first 6 seconds, the car is -
A changing its direction.
B experiencing less and less
friction.
moving at a constant speed
D climbing a steep incline.
Answer:
Letter B.
Explanation:
Changing its direction and climbing a steep incline can't be proven only by the graph info. You can see that it's speed isn't constant in the graph.
We have letter B left.
When bacteria have multiplied at least 1000 times, what is the pattern of growth that can be seen with the naked eye is called?
cluster
colony
family
clump
Answer:
Colony
Explanation:
What is the energy of a photon that emits a light of frequency 4.47 x 10^14 Hz?
A. 6.71 x 10^-19 J
B. 6.75 x 10^-19 J
c. 1.34 x 10^-19 J
D. 2.96 x 10^-19 J
Answer:
2.96 x 10^-19 J
Explanation:
I just took the test
A gas tank contains 3 gases (N2, O2, CO2). The total pressure of the gases is 825 mmHg. If the pressure of CO2 in 125 mmHg and the pressure of O2 is 350 mmHg, what is the partial pressure of N2 gas?
Answer:350 mmHg
Explanation:
use Dalton’s law:
P Total = P gas 1 + P gas 2 + P gas 3
825= P1+ 350+ 125
350+125=475
825-475= 350
P1= 350 mmHg
Light energy is captured by the green pigment ___________________________.
Answer:
Chlorophyll
Explanation:
chlo·ro·phyll
noun
a green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis. Its molecule contains a magnesium atom held in a porphyrin ring.
what is the name of the shape that is a quadrilateral where all 4 sides are the same length
HELP QUICK
Answer:
Square
Explanation:
A square is a quadrilateral with r sides the same length
Water circulates through Earth's water cycle by changing state state its acidity its acidity its turbidity
Complete question is;
Water circulates through Earth's water cycle by changing its _____.
A. state
B. acidity
C. turbidity
D. composition
Answer:
A: State
Explanation:
We can talk about this by observations about the states of water in the Earth's water cycle and even nature.
For example, water changing from liquid to steam(gas) in evaporation; under certain temperatures/conditions snow undergoes sublimation directly from solid to gas and also undergoes melting from solid to liquid; water vapour in the atmosphere undergoes condensation and cooling to form rain.
Thus, we can say that water circulates through the Earth's water by changing it's state.
How many match sticks will there be in the 4th picture?
Who was the leader of Iraq? *
Osama Bin Laden
Mikael Gorbachev
Şaddam Hussein
Answer: I believe it was Şaddam Hussein
Explanation:
An 18.7 g sample of platinum metal increases in temperature from 21.2C to 23.5C
when 5.7 J of heat are added. What is the specific heat of platinum?
Answer:
132.53 J/kg.°C
Explanation:
Applying,
Q = cm(t₂-t₁)................ Equation 1
Where Q = amount of heat, c = specific heat capacity of platinum metal, m = mass of platinum metal, t₁ = initial temperature, t₂ = Final temperature.
Make c the subeject of the equation
c = Q/m(t₂-t₁).............. Equation 2
From the question,
Given: Q = 5.7 J. m = 18.7 g = 0.0187 kg, t₁ = 21.2°C, t₂ = 23.5°C
Substitute these values into equation 2
c = 5.7/[0.0187×(23.5-21.2)]
c = 5.7/0.04301
c = 132.53 J/kg.°C
how many electrons does an element have if its atomic number is 20
Answer:
20 electrons
A neutral atom with atomic number 20 will have 20 electrons.
The atomic number is, by definiton, the number of protons in an atom's nucleus but for a neutral atom it's also equal to the number of electrons. Each element has a different, unique number of protons that determines its identity.
Explanation:
Why are humans responsible for oil spills
Answer:
Oil spills into rivers, bays, and the ocean most often are caused by accidents involving tankers, barges, pipelines, refineries, drilling rigs, and storage facilities.
Spills can be caused by:
people making mistakes or being careless.
equipment breaking down.
natural disasters such as hurricanes.
deliberate acts by terrorists, countries at war, vandals, or illegal dumpers.
Explanation:
Hope this helped Mark BRAINLIEST!!!
What is formed when 2 non metals reacts?
A) covalent bond
B) ionic bond
C) molecular bond
Answer:
A) covalent bond
Explanation:
Covalent bonding generally happens between nonmetals.
3. If a gas has a pressure of 32.1 psi at a temperature of 25°C, then what is the new pressure if the temperature is increased to 75°C?
Answer:
P2 = 37.5 psi
Explanation:
P1 = 32.1 psi
T1 = 25°C + 273 = 298K
T2 = 75°C + 273 = 348K
P2 = ?
P1/T1 = P2/T2
or
P2 = (T2/T1)P1
= (348K/298K)(32.1 psi)
= 37.5 psi
77.33 grams of aluminum is heated from 155°C to 175°C. The specific heat of aluminum is 0.921
J/g °C. How much energy is required? Round to the nearest whole number.
Answer:
1424
Explanation:
Q=mco
Qis energy
M is mass
C is specific energy
O is temperature change
Substitute all the information you have in the equation then you will get the answer
Which phrase describes an ecosystem?
a single tree monkey
a group of tree monkeys and a cluster of trees
a group of tree monkeys, a cluster of trees, a pile of rocks, and a fierce wind
a group of tree monkeys
Answer:
C. A group of tree monkeys, a cluster of trees, a pile of rocks, and a fierce wind.
How does velocity affect the movement of an object?
Answer:
when the velocity is at a higher *rate of speed*, the faster the object will move!
Explanation:
How many atoms are in 4 CH4? Does the subscript have any effect on the answer?
Answer:
If there's 4 molecules of CH4, then there will be 4 atoms of carbon and 16 atoms of hydrogen. (However, if it's just 1 molecule of CH4, then 1 carbon atom and 4 hydrogen)
Explanation:
Yes, the subscript does have an effect on the answer. The subscript indicates how much of a type of atom there is in a molecule. For example, 1 singular molecule of CH4 contains 1 carbon atom and 4 hydrogen atoms. Due to the subscript (4), it tells us that there are 4 hydrogen atoms. In this case, 4 molecules of CH4 contains 4 carbon atoms and 16 hydrogen atoms.
Which tool was most likely used in a procedure if the lab report shows that 300 mL of water was used?
O a volumetric flask
O a thermometer
a pipette
O a graduated cylinder
why would an electric vehicle be allowed to travel in the high occupancy vehicles lands with only one driver ?
Answer:
because it could self drive
Explanation:
idrk but thats my answer
what is a carnivore?
Answer:
I think its when someone eats only meat
Answer:
A meat eater. Or a animal that has a diet strictly set to other animals.
Explanation:
Hope this helps!
In a balanced chemical reaction, the number of atoms of each element in the product(s) always equals the
A. molar mass of the reactants
B. proportional masses of the reactants
C. the number of atoms of each element in the reatants
D. the number of elements in the reactants
Will mark the brainliest answer!!
If you cross a purebred pea plant with green seeds and a purebred pea plant with yellow seeds, what percent of their offspring will have green seeds?
A. 100 percent
B. 75 percent
C. 25 percent
D. 0 percent
Answer:
100%
Explanation:
assuming green is the dominant trait, 100% will have green seeds, but none will be purebred
Select the correct structure that
corresponds to the name.
2-hexyne
A. CH3CH2CH2C=CCH3
B. CH3C = CCH2CH2CH3
C. both
Answer:
c) both
Explanation:
hey, could you check the question once because I suppose it's 2-hexyne when there's a triple bond and 2-hexene when there's a double bond between Carbon atoms. As of the question asked, it's c) both but it's 2-hexene due to presence of double bond between Carbon atoms.
do tell me as well. have a good day :-))
Answer:
(C) Both
Explanation:
Due to my calculations, I have come up with conclusion that this is indeed the correct answer for the problem.
If you have 2 Moles of C3H6 and 10 Moles of O2, which reactant is limiting the following reaction: 2C3H6 + 9O2 → 6CO2 + 6H2O?
CO2
H2O
C3H6
O2
Answer:
The limiting reactant is propene, [tex]C_3H_6[/tex].
Explanation:
[tex]2C_3H_6 + 9O_2 \rightarrow 6CO_2 + 6H_2O[/tex]
Moles of nitrogen propene = 2 mol
Moles of oxygen = 10 mol
According to reaction, 2 moles of propene reacts with 9 moles of oxygen gas, then 2 moles of propene will react with:
[tex]=\frac{9}{2}\times 2mol=9\text{mol of oxygen gas}[/tex]
According to the question, we have 10 moles of oxygen gas, which is more than 9 moles of oxygen gas. This indicates that propene is present in a limiting amount hence, it is a limiting reactant.
The limiting reactant is propene, hence the correct answer is the [tex]C_3H_6[/tex].
