Help with chemistry please
Which chemical reaction involves the most oxygen atoms?
320 grams of brass released 5000 J of heat. If it has an initial temperature of 50°C, what is its temperature after releasing the heat? The specific heat capacity of brass is 376 J/kg. *
Answer:
ok:
Explanation:
We have:
[tex]q = mc\Delta T[/tex]
we know that q = -5000 J (it is negative since you release energy)
m = 320 g
and c = 376 J/kg.
We need to be careful before plugging them in. Since the units are J/kg for c, but we are talking about grams for m, we need to convert. I will just divide c by 1000 to get c = 0.376 J/g
We can now plug in:
(-5000 J) = (320 g) * (0.376 J/g) * [tex]\Delta T[/tex]
We can solve that [tex]\Delta T[/tex] = -41.5555
So the final temperature is [tex]T - \Delta T[/tex] which equals around 8.4°C.
Consider the reaction below.
2NH318) N26 + 3H20)
What is the most likely effect to the forward reaction if there is an increase in pressure on this reaction?
O The reactant surface area increases.
O The reaction rate decreases.
O The reaction is not affected at all.
O The reaction stops completely.
Answer:
B. The reaction rate decreases
Explanation:
I just took the pre test and got a 100
The water gained 900 J of energy, what was the energy change of the metal?
Answer:
it lost 900J of energy I will assume and that would mean the change in energy is -900J
Explanation:
Please actually help me.
Thank you!
Answer:
I say 20 is ur best option
I need help really bad with this!!!
For the following:
Highlight each subscript in RED.
Highlight each coefficient in BLUE.
H2O 5Cl2 2Mg 3H2O2
For the following
List the chemical symbols of each element.
Give the number of atoms of each element.
HCl CO2 Na2SO4
Balance the following chemical equations.
1. Cu2O + C → Cu + CO2
2. H2O2 → H2O + O2
Al + Fe3N2 → AlN + Fe
4. Ag2S → Ag + S8
5. ZnS + AlP → Zn3P2 + Al2S3
6. Fe(OH)3 → Fe2O3 + H2O
Given the two chemical equations, highlight in RED the one that is balanced.
7. a. 2Na + Cl2 → 2NaCl
b. 2Na + 2Cl2 → 2NaCl
8. a. C3H8 + 5O2 → 3CO2 + 4H2O b. 2C3H8 + 5O2 → 3CO2 + 8H2O
9. a. 2NH3 + 5O2 → 2NO + 3H2O b. 4NH3 + 5O2 → 4NO + 6H2O
10. a. Y(NO3)2 + GaPO4 → YPO4 + Ga(NO3)2
b. 2Y(NO3)2 + 2GaPO4 → 2YPO4 + Ga(NO3)2
Answer:
Did u get the answers
Explanation:
HELP I WILL GIVE BRAINLY FOR THE CORRECT ANSWER 1. Write the correct formula for the ionic compound formed between atoms of each of the following pairs of elements
.a. Sodium and sulfurb.
Aluminum and nitrogenc.
Barium and fluorined.
Sodium and phosphatee.
Calcium and hydroxidef.
Ammonium and carbonate
Using the table for electrode potential differences (Figure 2) identify the possible composition of the screws responsible for the corrosion observed in the contact area with the copper wire.
What is the temperature (in °C) of a room where the gas has a volume of 0.635 L at 1 atm?
3. __CH4 + __O2-> __CO2 + __H2O
4. __K + __H2O-> __KOH + __H2
Answer:
3: 1 CH4+ 2 O2-> 1 CO2 + 2 H2O
4: 2 K+ 2 H2O -> 2 KOH+ 1 H2
Explanation:
14. A researcher Is curious to find out what effect classical music has on people's level of relaxation
(as measured by heart rate). She suspects that listening to classical music will make people feel
more calm and relaxed. The researcher lets one group listen to classical music for one hour and
then do a relaxing activity, like reading or drawing for another hour. She lets the other group sit in a
qulet room for two hours (they hear no music). After two hours, she monitors the heart rate of each
participant to measure their level of relaxation.
What is the error in thls experiment design?
A. There are two independent variables: classical music and an additional relaxing activity
B. There are two independent variables: the amount of time and heart rates
C. There are two dependent variables: classical music and an additional relaxing activity
D. There are two dependent variables: the amount of time and heart rates
Answer:
It should be "B"
Explanation:
:) :) :) :) :) :)
Why is it difficult for hydrogen atoms to stick together
Answer:
So, the energy of two hydrogen atoms is lower when the two atoms are together than when the two atoms are apart; that is why they stay together.
Explanation:
the empirical formula for a compound used as a green paint pigment is C2H3As3Cu2O8. The molar mass of its molecular formula was found to be 1013 grams. What is the molecular formula?
Answer:
Molecular formula = C₄H₆As₆Cu₄O₁₆
Explanation:
Given data:
Empirical formula = C₂H₃As₃Cu₂O₈
Molar mass of compound = 1013 g/mol
Molecular formula = ?
Solution:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass of C₂H₃As₃Cu₂O₈ is 506.897 g/mol
by putting values.
n = 1013 / 506.897
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (C₂H₃As₃Cu₂O₈)
Molecular formula = C₄H₆As₆Cu₄O₁₆
Which of the following could be the speed of an object at rest?
0 m/s
-4 m/s
20 m/s
1 m/s
Answer:
0 m/s
Explanation:
An object at rest stays at rest unless acted upon therefore it can only be 0.
need help with this question plsssss
Answer:
234
Explanation:
What is this equation balanced?
CH4 + 2O2 =》CO2 + 2H2O
Answer:
the balanced chemical reaction is provided above .
Explanation:
the given reaction is reaction of methane with oxygen ( or burning of methane in presence of oxygen )
it is highly exothermic, because high amount of heat is evolved in this reaction
which are exmaples of chemical change?
•baking cookies
• The statue of liberty's metal tarnishes from copper to green
• cold butter melts into liquid when heated
•salt is dissolved into freshwater
•Food scraps decompose into fertilizer in a compost pile
• frying changes the color and texture of an egg
•ocean water evaporates to water vapor on a hot day
•lighting a match
Answer:
cold butter melted when heated, lighting a match, baking cookies,
Explanation:
what do water, air and rocks have in common
These two finches share a common ancestor from South America. What is the most likely way that one ancestral finch species will develop into two distinct species?
A The ancestral species was genetically engineered to become two new species
B Groups of the ancestral species became isolated and adapted to different environments.
C. Two individual birds acquired many spontaneous mutations.
D. The ancestral species mated with other species and the offspring resulted in two new species.
Answer:
The correct answer is - B. Groups of the ancestral species became isolated and adapted to different environments.
Explanation:
Two finches Warbler Finch and Woodpecker Finch are two distinct finches are finches from the Galapagos Islands. Both of these finches have a common ancestor from South America.
The most likely explanation of developing two distinct species from an ancestral finch is by bein isolated and developed or adapted according to the challenges and environmental conditions and ultimately become different species after several generations.
Which of these bonds should be classified as ionic?
A.
Na-O
B.
C-S
C.
H-Cl
D.
Be-S
Answer:
Na-O
Be-S
Explanation:
ionic bonds= metal and non metal
Answer:
Na-O
Explanation:
i solved it in study island and i got this answer correct
If there is 3% freshwater available on earth, approximately what percentage of it is in ice?
Is it technically correct to call ionic compounds molecules?
Answer:
uh yeah I think so technically
Answer:
no
Explanation:
HELPPP ASAP PLEASE .
Answer:
ok .
Explanation:
.
Calculate the new pressure if a 2300 mL of a gas at a pressure of 1.88 atm is allowed to contract to a volume of 2.21 L.
Answer:
V₂ = 0.958 atm
Explanation:
Given data:
Initial volume = 2300 mL (2300/1000 = 2.3 L)
Initial pressure = 1.88 atm
Final volume = (2.21 L + 2.3L) = 4.51 L
Final pressure = ?
Solution;
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
1.88 atm × 2.3 L = P₂ × 4.51 L
V₂ = 1.88 atm × 2.3 L / 4.51 L
V₂ = 4.32 atm.L / 4.51 L
V₂ = 0.958 atm
how many atoms of oxygen are in 3.45g of Na2SO4
Answer:
HERE
Explanation:Therefore, there will be
6.022
×
10
23
oxygen atoms in
1
mole, or
18 g
of water.
Which characteristic is used to classify galaxies?
1. the size of the galaxy
2. the shape of the galaxy
3. the presence of dust and gas between stars
4. the presence of active star formation sites
Answer:
2. the shape of the galaxy
Explanation:
There are four classifications of galaxies and these are: spirals, barred spirals, ellipticals and irregulars. It was Edwin Hubble, an American Astronomer who identified them. They were given such names owing to their shapes. For example, the spiral galaxy looks like it is rotating while the barred spiral galaxy also looks rotating yet it has a bar at the center. Elliptical galaxies have an elliptical shape, similar to that of an elongated circle or an egg. Irregular galaxies don't stick to a particular shape.
Answer:
b
Explanation:
Calculate the density of a sample with a mass of 31.6g and a volume of 9.5mL include units in your final answer
Answer:
3.33 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{31.6}{9.5} \\ = 3.326315...[/tex]
We have the final answer as
3.33 g/mLHope this helps you
How many oxygen atoms are contained in a sample of aluminum nitrate, Al(NO3)3, with a
mass of 4.285 x 10-21 g? (molar mass of Al(NO3)3 is 213 g mol-l)
a 109
b. 54
c. 9
d. 3
the answer is 9
Explanation:
Explanation: In 1 formula unit of Al(NO3)3 , there are (clearly!) 9 atoms of oxygen, 3 nitrogen atoms, and 1 aluminum atom.
Our Sun will eventually turn into a red giant and, finally, a white dwarf. Use the Hertzsprung-Russell
diagram to describe how the Sun's luminosity and temperature will change as it goes through these
stages.
Our Sun will eventually turn into a red giant in the cooler temperature and high luminosity and in the white dwarf phase has a hot temperature & dim luminosity.
What is Hertzsprung-Russell diagram?In astronomy, the Hertzsprung-Russell diagram, often known as the H-R diagram, is a graph that plots the absolute magnitudes (intrinsic brightness) of stars against their spectral classifications (temperatures).
From the given diagram it is clear that when sun turns into a red giant then the temperature decreases and luminosity increases as it becomes large in size. And when it finally become a white dwarf then temperature comparatively increases and luminosity gets dim due to smaller size.
Hence in the red giant phase sun has a cooler temperature and high luminosity and in the white dwarf phase has a hot temperature & dim luminosity.
To know more about Hertzsprung-Russell diagram, visit the below link:
https://brainly.com/question/22641110
#SPJ2
ITEM BANK: Move to Bottom
Balance
Measured in Newtons
Measured in grams
Property of matter
Spring Scale
Weight
Both
Mass
Cugan 100
drag and drohte
Answer:
The scale reads the tension in the string. The tension in the string is 100 N. This is the force the string must exert up on either of the 100-N weights at either end of the string.
Nothing is moving, nothing is accelerating, so the net force on the spring is zero. Likewise, the net force on either of the 100-N weights is also zero. But that is another question. The spring scale does not measure the net force. The spring scale simply measures the tension, the magnitude of the force exerted by the string.
Explanation: