Answer:
2x - 9y = 23
5x - 3y = -12x - 9y = 23
5x - 3y = -1
Explanation:
What theory was Huygens writing about?
the particle theory of light
the reflection of light off objects
the way objects refract light
the wave theory of light
Answer:is D.the wave theory of light
Explanation:
cuz i got it wrong :( but the answer is correct :3
Answer:
D) wave theory of light
Explanation:
Which of the following is a producer?
Answer:
D is a producer....................
Answer:
D
Explanation:
the trees produce lots of things like air and helps animals and the economy which is producing
How much energy does a wave with a frequency of 7.0 x 1012 Hz have
Answer:
4.64 × 10⁻²¹ J/s
Explanation:
[Only if the wave travels at the speed of light]
Because a wave presumed to be at light speed is a photon, E = hf.
If frequency is not given, E = hc/λ
c is the speed of light in meters per second. c = 299, 792, 458 m/s.
λ is the wavelength which is dependent.
h or plancks constant = 6.62607004 × 10⁻³² m² kg / s.
E is in units of J / s or jules ( m² kg ) per second.
If the wave has a frequency of 7.0 x 10¹² Hz or 7 THz (Tera-Hertz).
E = (6.62607004 × 10⁻³⁴) × (7.0 × 10¹²) =
46.38249028 × 10⁻²² =
4.638249028 × 10⁻²¹ J/s ≈
4.64 × 10⁻²¹ J/s
Cells, chromosomes, Body system, DNA (smallest to largest)
Explanation:
cells, dna, chromosomes, body systems
What is true of the mass and volume of all the floating objects?
Answer:
if the density is higher than water than the object will sink
Explanation:
How plants affect weathering?
Plants can grow in between rocks and break apart into smaller pieces.
Plants can prevent water from eroding rocks.
Plants can prevent wind from eroding rocks.
Plants can move rocks into smaller pieces.
Answer:
plants can grow in between rocks and break apart into smaller pieces
Explanation:
hey can someone help me please
Explanation:
A period in a periodic table is a row of chemical elements.A. magnesium (Mg). B.potassium(k). C.iron(Fe). D.copper(Cu)A.C(carbon). B.Cl(chlorine). C.Au(gold). D.Sr(strontium)He(helium 1).Ge(germanium 4). Rb(rubidium 5).I(iodine 5)Sulfur(VIA or6A). Ca(calcium 2A). iodine (VIIA or 7A). Fe(iron VIIIB or 8B)Halogen (chlorine, iodine) . Chalogen(sulfur). AIkali metal(. potassium and. sodium ). Boron(boron). Lanthanide series(Lanthanum). Alkaline earth metal(magnesium and calcium). Transition metal (iron gold). Nobel gas(Helium Argon)when a catalyst is added to reactants, the reaction rate may increase or..
A: occur at a lower temperature
B: decrease
C: stay the same
Answer:
a
Explanation:
It increases the reaction rate by lowering the activation energy for a reaction
22) Name the neutral element with this orbital diagram.
Answer:
Sn (Tin)
Explanation:
what is the chemical formula for stannic oxide
Answer:
SnO₂
Explanation:
the chemial formula for stannic oxide is SnO₂
How can you tell if two objects are in thermal equilibrium?
The objects have the same temperature.
The objects are touching each other.
The objects' temperatures are changing.
The objects are the same size.
Answer:
Two objects are in thermal equilibrium if they are in close contact that allows either to gain energy from the other.
Answer: The Objects have the same temperature
Explanation: i just took the test
50 POINTS QUESTION. PLEASE HELP ASAP, CLICK THE LINK BELOW AN IT WILL GIVE THE QUESTION. THANKS :)
Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your file(s) and are ready to upload your assignment, click the Add Files button below and select each file from your desktop or network folder. Upload each file separately.
Answer:
that pdf looks sus
Explanation:
Warm-Up
As a family eats dinner, they decide to try to classify the matter around them.
Which categories could the family use for classifying matter?
solids, liquids, and gases
elements, compounds, and mixtures
living things and nonliving things
Answer:
well it depends are they carnivors or eating soup or are they sucking on co2
Explanation:
all of them have a good day
Answer: the answer is selecting all three ( solids, liquids, gasses) (elements, compounds, and mixtures) (living things, and nonlinear things)
Explanation: I got it right:)
Do anyone know science??
Answer:
I do not understand.
Explanation:
What do you mean by that?
Yes I know science but why are you asking a question like this?
The offspring of a sexually reproducing organism receives
A.
half of its genetic material from each parent.
B.
an exact copy of each parent's genetic material.
C.
an exact copy of one parent's genetic material.
D.
genetic material that is not related to either parent.
Answer:
It's A because its almost like a personality its just a sexuallity / gender
Answer:
half of its genetic material from each parent.
Explanation:
Due in 5 mins!!!! Pls hurry
Which of the following would be the best example of potential energy?
A racecar moving at 120 miles per hour around a track.
a bullet shot out of a gun
a rollercoaster at the bottom of the first hill
a rubber band stretched to its fullest length right before someone lets it go
Answer:
D because it is in a fixed position
Number of atoms in a 95.0 g sample of a gold nugget
Answer:
2.9 * 10^23 atoms Au
Explanation:
(95 g Au) * (1 mol Au/196.96657) * (6.02 * 10^23 atoms Au / 1 Mol Au)
2.9 * 10^23 atoms Au
Which is a common way for a scientific calculator to show the number
below?
3*109
O A. 93
B. 9 * 103
C. 9E3
D. 3E9
Answer:
it can show it using the B method am i right
is cobalt magnetic or no
Answer:
yes, it is a magnetic material
it can be attracted by a magnet
hope it helps
Answer:
yes ut is magnetic because it is metals
How many molecules are there in 3.20 grams of NH4SO2?? explain if you can
Answer:
0.0389757845886336
Explanation:
Which element consists of positive ions immersed in a “sea” of mobile electrons
Answer:
Explanation:
Nickel is the only metal listed. Metal elements have metallic bonds between the metal atoms. Positive metal ions in a sea of electrons.
Metals are electron rich and they contains positive immersed in sea of of mobile electrons. Hence, option c the metal calcium is correct.
What are metals?Metals are electropositive elements. they classified into s-block and d -block of periodic elements. he first group elements are called alkali metal and the second group elements are alkalie earth metals.
d-block elements are called transition metals. All these elements are rich in electrons and they can easily donate their electron to non metals forming positively charged ions called as cations.
Metallic atoms have highly ordered crystalline structure. Their metal lattice contains ions and electrons holded by strong metallic bonds and some electrons are delocalized into interstices.
Hence, it is said that they consists of positive ions immersed in a sea of mobile electrons. And the option c calcium metal is correct. Calcium is an alkaline earth metal.
To find more on metals, refer here:
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Your question is incomplete, but your complete question probably was:
A.
Sulfur
B.
Nitrogen
C.
Calcium
D.
Chlorine
What is the speed of a wave with a frequency of 560 Hz and a wavelength of 50 m?
Answer:
v is the wave speed in metres per second, m/s. f is the frequency in hertz, Hz. λ (lambda) is the wavelength in metres
How would you describe boiling point?
Answer:
Boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature. Water at its boiling point.
Explanation:
g00gle worls
The poisonous gas hydrogen sulfide, H2S, can be neutralized with a base such as sodium hydroxide,
NaOH. The unbalanced equation for this reaction follows:
NaOH(aq) + H25(e) → Na2S(aq) + H2O(1)
A student who was asked to balance this equation wrote the following:
Na2OH(aq) + H2S(g) → Na2S(aq) + H2O(
Is this equation balanced? Is it correct? Explain why or why not, and supply the correct balanced
equation if necessary.
Answer:
It's not correct. For balancing, we need to put the coefficients in the molecule, not in the athom. Because if you do this, you're creating another molecule, instead of a balacing, for which the reaction may not happen - but anyway, it would be another reaction.
The correct balacing is:
2NaOH + 1H2S → 1Na2S + 2H2O
Explanation:
Look: Na2OH does not even exist. OH has only one free link, so he can't - in normal conditions - make another one with any athom. That's why we should write 2NaOH instead of Na2OH. The first means "2 mols of NaOH".
HEYOO PEEPS 1. Ethan Rides his bike up a 20km hill in 2hrs. Ethan rides his bike down the 20km hill in .5 hrs. What is Ethan’s average speed?
Answer:
let Leo's speed = x mile/hr
so Ethan speed = (x + 6) miles per hour
Distance = Speed × Time
so distance traveled by Leo in 2 hours = x × 2 = 2x
and distance traveled by Ethan in 1.5 hours = 1.5( x + 6 ) = 1.5x + 9
since they meet on the path , After Ethan has ridden 1.5 hours and Leo has ridden 2 hours , so together the have traveled on complete path that is 65 miles.
⇒ distance traveled by leo in 2 hours + distance traveled by Ethan in 1.5 hours = 65
⇒ 2x + 1.5x + 9 = 65
⇒ 3.5x = 56
⇒ x = 16
Hence Leo's speed = x miles/hr = 16 miles/hour
and Ethan's speed = (x + 6) miles/hr = 16 +6 = 22 mile/hour
Explanation:
sorry if this isnt the one im think of
10.0 points
When sodium azide is activated in an auto-
mobile airbag, nitrogen gas and sodium are
produced according to the equation
2 NaN_(s) —> Na(s) + 3N2(g).
If 0.12 mol of NaN3 reacts, what mass of
nitrogen would result?
Answer in units of g.
Please help my teacher has like given up
Calculate the molar volume (volume of 1.0 mole) of an ideal gas at 1.0 atm and 25 °C?
Answer:
24.47 L
Explanation:
Using the general gas law equation:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = 0.0821 Latm/molK
T = temperature (K)
According to the provided information in this question,
P = 1.0 atm
V = ?
n = 1 mol
T = 25°C = 25 + 273 = 298K
Using PV = nRT
V = nRT ÷ P
V = 1 × 0.0821 × 298 ÷ 1
V = 24.465 ÷ 1
V = 24.465
V = 24.47 L
A rock has a mass of 15 grams and a
volume of 3 cm3. What is the density of the
rock?
HINT; The formula for density is:
density =
mass (g)
volume (cm)
A А
B
5 g/cm3
18 g/cm3
45 g/cm3
Answer:
5 g/cm3
Explanation:
Density = mass/volume
density = 15g / 3 cm3 = 5g/cm3
Answer:
3.34 g/cm3
Explanation:
if a steel spoon were to be plated with silver, state what would be suitable as the anode, cathode, electrolyte
Answer:
tae hahahah joke lang hindi ko alam ehh
4. The radius of a hydrogen atom is 37 pm (1pm 10"m). How many hydrogen atoms lined up side to side would it take to make 1.00 inch? (Hint start with 1.00 inch)
Answer:
V = 4/3 * 3.1416 * (37x10-10)3
V = 2.12x10-25 cm3
d = m/V
d = 1.67x10-24 / 2.12x10-25 = 7.87 g/cm3
The difference in temperature, let's convert F to ºC:
ºC = -80-32/1.8 = -62.22 ºC
dT = -92.6 + 62.2 = -30.4 ºC
The number of hydrogen atoms lined up side to side to make 1.00 inch is equal to 3.43 × 10⁷ atoms when the radius of one H-atom is 37 pm.
What is the radius of a hydrogen atom?The atomic radius of a hydrogen atom is the distance between the center of the nucleus to the boundary of the electron that surrounds it.
Given, the radius of the hydrogen atom = 37pm
Then the diameter of the hydrogen atom = 37 + 37 = 74 pm
We know that 1 pm = 10⁻¹¹ m
Then the diameter of the one H - atom = 74 × 10⁻¹¹ m
The value of 1 m = 100 cm then the diameter of H-atom = 74 × 10⁻⁹ cm
As we know, the value of one inch = 2.52 cm
So, if 74 × 10⁻⁹ cm length takes H-atom = 1
Then, 2.52 cm would take hydrogen atoms = 2.52/ 74 × 10⁻⁹ = 3.43 × 10⁷
Therefore, 3.43 × 10⁷ hydrogen atoms lined up side to side to make 1.00 inch.
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