Answer:
i believe the answer is 2.812
Explanation:
A student has a sugar cube and a glass of tea.
What are two ways the student can increase the speed at which the sugar
cube dissolves in the glass of tea?
O A. Add more sugar cubes to the tea.
B. Add ice cubes to the glass of tea.
C. Stir the tea after adding the sugar cube.
D. Break the sugar cube into smaller pinces.
Answer:
D or C Because C speads up the process while D makes the water have to process less But I say C
Explanation:
could I get brainlists plz
Answer: C & D
Explanation: hope this helps
Read the statement and identify whether it is a Chemical Change, Physical Change, or Both. Answer the following questions Chemical (A), Physical (B) or Both (C).
Eating and digesting cheese pizza.
Explanation:
Eating and digesting cheese pizza is a Chemical Change because it is an irreversible reaction. It can't be undone.
Which of the following is the best example of solar energy being converted into chemical energy?
Can someone help me pleaseeeeee!!!!
Can any kind soul help me ASAP
Answer:
in my opinion its going to be B because the moles of experiment I are more than moles of experiment II
If we want to know how many neutrons an element has we:
a. look at Period Number ( row)
b. subtract Atomic Number from Atomic Mass
c. look at Atomic Mass (below element symbol)
d. look at Atomic Number (above element symbol)
Answer: B
Explanation: I don’t really know how to explain this because it’s just something my teacher told me and it just stuck in my head
A red hot iron bar is dipped into 600 ml of water ( 600. g of water) which causes
the temperature of the water to rise from 22 degrees celcius to 89 degrees
celcius. Determine the heat lost by the iron bar. ****hint: The amount of heat lost
= amount of heat gained *
Answer:
heat lost by iron bar is 168.2 kJ
Explanation:
The heat gained by the water as a result of temperature rise is given by:
Q = mCΔT
ΔT = change in temperature = final temperature - initial temperature = 89°C - 22°C = 67°C
m = mass of water = 600 g
C = specific heat of water = 4.184 J/g-K
Q = heat gained
Substituting:
Q = 600 * 4.184 * 67
Q = 168.2 kJ
The heat gained by the water is 168.2 kJ
The heat lost by iron bar = heat gained by water
heat lost by iron bar = 168.2 kJ
There are two compounds of gold and chlorine. In one compound, there is 15.39 g of gold for every 2.77 g of chlorine. In the other compound, there is 7.74 g of gold for every 4.18 g of chlorine.
Find the ratio of masses of gold in the two compounds (give in 'y:x' format)
The answer is 3:1 so whoever this helps
Answer:
The ratio of the masses of gold in the two compounds = 3 : 1
Explanation:
In compound 1:
15.39 g of gold combines with 2.77 g of chlorine
mass of gold that will combine with 1 g of chlorine = 15.39/2.77 = 5.55 g
In compound 2:
7.74 g of gold combines with 4.18 g of chlorine
mass of gold that will combine with 1 g of chlorine = 7.74/4.18 = 1.8 g
Ratio of gold in the that combines with 1 g of chlorine in the two compounds is given as
5.55/1.85 = 3
Therefore, the ratio of the masses of gold in the two compounds = 3 : 1
How many molecules are in 23.45 moles of oxygen (O2)?
White powder lab analysis
Once atoms have achieved a full outer shell they have the electron configuration of what family?
will mark brainliest
Answer:
At some point in your chemistry education, you may have been introduced to the song “The Elements,” in which Tom Lehrer does a rapid-fire musical rendition of all the elements' names. Like me, you may even have been offered the opportunity to memorize this song for extra credit. If so, it’s possible that you still remember the names of all the elements, which is an impressive feat—not to mention a fun trick to pull out at parties.
Explanation:
Answer:
atoms tend to achieve the electron configuration of a noble gas which is a full outer level of 8 electrons
Please help! Select all the compounds listed below that are covalent compounds.
SO2
NaOH
CH4
CABr2
What is the charge of a lithium ion
Answer:
+1
Explanation:
lithium is in group 1 of the periodic table and all group 1 elements have a charge of +1
1) All atoms of the same element must contain the same: a) mass number b) protons c) neutrons d) compounds
Answer:
all atoms of the same element mist contain the same number of. protons
Explanation:
For isotopes, only the number of neutrons has been changed. examples are carbon-12 carbon-13 and carbon-14, because none of these situations change the number or protons, the atomic number stays the same regardless
Mari wonders why some parts of the hoodoo seem to be wearing away faster than others. Which factor causes this to happen? *
Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
What is hoodoo ?A hoodoo is indeed a tall, thin rock spire created by erosion. It is also known as a tent stone, fairy chimneys, and earth pyramid. Typically, hoodoos are made of very brittle rock that is covered in harder, less brittle stone that shields each column first from weather.
Hoodoos can have varying colors over the course of their height due to minerals deposited within various types of rock. Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
Therefore, some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
To know more about rock, here:
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_____ is a complex carbohydrate used to store
energy in animals.
Answer:
Glycogen
Explanation:
Which option is an example of a physical property?
A toxicity
B rusting ability
C melting point
D flammability
Answer:
C . Melting point
Explanation:
Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density
At room temperature(20°C), water is a:
solid
liquid
gas
Answer:
Solid
Explanation:
At room temperature(20°C), water is a:
Virtual Classifying Elements on the Period Name the three general categories into which the elements are divided. 3
Answer:
kgtπ橆§π©gu6gt7
Explanation:
Help me please will give brainliest!!!
Answer:
Element A and element D
Please make me brainliest!!
WILL MARK BRAINLIEST
Predict the charge each of the following atoms would have as an ion-if more than one charge is possible,
include each different charge
A. Cl
B. Na
C. Mg
D. O
E. Al
F. N
G. Be
H. Ne
Explanation:
A. Cl⁻
B. Na⁺
C. Mg⁺⁺ Or Mg²⁺
D. O²⁻
E. Al³⁺
F. N³⁻
G. Be²⁺
H. Ne (No charge because it's an noble element)
chemical properties can be used to
Answer:Chemical properties can be contrasted with physical
Explanation:
What are derived units? Give an example
A nuclear fission reaction produces more energy than a nuclear fusion reaction.
True or false
Answer:
true
Explanation:
What is a change in the environment outside of the organism
what are all of the man made elements
Answer:
technetium,promethium,polonium.and astatine
Explanation:
The U.S. Military provides personnel on deployment with fuel bars to heat up their meals. A fuel bar provides 380.0 kJ of energy, and 73% of that energy can be transferred to food. How many ounces of water could be heated by one fuel bar to brew coffee in the field? The initial temperature of the water is 16.0°C and it needs to be heated to boiling at 100.0°C.
Answer:
Explanation:
380 x 10³ J
73% of 380 x 10³ = 277.4 x 10³ J
mass of water = m gram
heat used to boil water = m x 4.2 x ( 100 - 16 )
= 352.8 m = 277.4 x 10³
m = 786.3 g
1 gram = .0352 ounce
786.3 gram = 786.3 x .0352 ounce
= 27.68 ounce .
help please thank u!!!
What happens when the chemicals inside an instant cold pack mix together
A.the mixture inside the pack gives off coldness
B.the mixture generates static electricity
C.the mixture absorbs thermal energy from the surroundings
D.the mixture releases thermal energy into the surroundings.
Answer:
the answer is C
Explanation:
there is no such thing as COLD exept absolute ZERO. anything that feels COLD, perse, is just tranfering your thermal energy into it, since it is lacking that energy
When the chemicals inside an instant cold pack mix together then the mixture absorbs thermal energy from the surroundings.
How heat is flow?Heat always flow from hot body to cold body in order to maintain the equilibrium between two bodies.
So when the chemicals inside an instant cold pack mix together then they will absorbs heat in the form of thermal energy from the surronding as they are in cool temperature and will not able to give off heat.
Hence absorption of thermal energy from the surrounding takes place.
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Helppp plzzz
What can be accurately said about
Earth's continents?
WILL GIVE BRAINLIEST!!!!!
osmium, magnesium, titanium, iron
Explanation:
