Answer:
its c my guy
Explanation:
9. How long will it take 120 grams of Strontium-90 to decay to 7.5 grams?
with steps pls
Answer:
116 years
Explanation:
To solve this, we will use the half life equation;
A(t) = A_o(½)^(t/t_½)
Where;
A(t) is the amount of strontium left after t years;
A_o is the initial quantity of strontium that will undergo decay;
t_½ is the half-life of strontium
t is the time it will take to decay
We are given;
A(t) = 7.5 g
A_o = 120 g
From online values, half life of strontium-90 is 29 years. Thus, t_½ = 29
Thus;
7.5 = 120 × ½^(t/29)
Divide both sides by 120 to get;
7.5/120 = ½^(t/29)
0.0625 = ½^(t/29)
In 0.0625 = (t/29) In ½
-2.772589 = (t/29) × (-0.693147)
(t/29) = -2.772589/(-0.693147)
t/29 = 4
t = 29 × 4
t = 116 years
Tritium (H-3) is a radioactive isotope of hydrogen with a half-life of 12.3 years. How long would it take for a 40.0g sample to decay down to 1.25g
Answer:
the answer maybe is 61.5 years (please check with others) tq
Explanation:
40/2=20
20/2=10
10/2=5
5/2=2.5
2.5/2=1.25
so one half life is 12.3 years
then 12.3 ×5 =61 .5
(why 5 ? because it decay 5 times to get 1.25 from 20)
A student is drinking a cup of hot chocolate as they sit by a campfire on a chilly evening. They know that the cup of hot chocolate transfers thermal energy to the surrounding air. The heated air over their cup of hot chocolate expands and rises and is replaced by cooler, denser air.
This method of energy transfer is —
Answer:
A student is drinking a cup of hot chocolate as they sit by a campfire on a chilly evening. They know that the cup of hot chocolate transfers thermal energy to the surrounding air. The heated air over their cup of hot chocolate expands and rises and is replaced by cooler, denser air.
This method of energy transfer is
Explanation:
Answer:
radiation
Explanation:
radiation is when an existing heat source spreads heat to its surroundings
25 points!!! please Which types of elements areconsidered neutraland Where are these types of elements found on the periodic table
Elements which composed of an equal amount of three components protons, neutrons and electrons are considered neutral elements. example of neutral elements are hydrogen, helium, lithium and beryllium...
How can mutations occur in cells? Submi Save and Exit Next Mark this and return
by rounding them to the neerest 10
18. Which metal is capable of forming more than one cation?
Li
Ba
Al
Sn
Answer:
Li
Explanation:
help me with cience for brainest:) its easy:)
Answer:
Stronger
And its science
Explanation:
Answer:
stronger for top.
weaker for bottom.
passed all sciences in freshman year :D
Anna was looking at a map that showed where hurricanes had formed. She noticed that more hurricanes formed over tropical oceans than over colder ocean areas. Which of these best explains
why more hurricanes form over tropical oceans?
Water has fewer currents in tropical oceans than in colder oceans.
Air has less moisture over tropical oceans than over cold oceans.
Water has more waves in tropical oceans than in colder oceans.
Air has more moisture over tropical oceans than over
Answer: D
Explanation:
when you burn wood in a campfire, ____ energy is converted to ____ and light energy.
Answer:
when you burn wood in a campfire, chemical energy is converted to heat and light energy.
Explanation :
When wood is burned stored potential energy ( in the form of chemical energy ) in the log is released due to heating by other excited atoms . This process is called combustion and requires presence of oxygen. So, combustion can be defined as a process which changes chemical energy into kinetic energy in the form of heat. In case of combustion an organic say wood in this case combines with oxygen present in the atmosphere to give off carbon dioxide, water and energy in the form of heat and light .
when is light produced during e- configuration
pls asap figure it out pls I will mark brainliest
Answer:
NaCl (Na is a metal and Cl is a nonmetal) MgO (Mg is a metal and O is a nonmetal) Al2O3, NaF, Na2O
Explanation:
You have to have a metal and a non metal together for it to be ionic
what is the anwser to this question
Answer:
N/A
Explanation:
"what is the anwser to this question" Is Not Available because this no question.
Please like this.
what is the temperature in the fahrenheit?
Why does forming bonds release energy? *
Why are summer days longer than winter days on Earth?
A. During the summer, Earth's rotational axis is parallel to the Sun's rotational axis.
B. During the summer, Earth is at the point in its orbit when it is closest to the Sun.
C. The region of Earth experiencing summer rotates past the Sun more slowly than the region experiencing winter.
D. The region of Earth experiencing summer is tilted toward the Sun while the region experiencing winter is tilted away from the Sun.
PLEASE HELP ITS A TEST
Answer:
A. During the summer, Earth's rotational axis is parallel to the Sun's rotational axis.
Explanation:
Actually, though, the Earth is tilted 23.4 degrees! (A circle is 360 degrees.) This tilt is the reason that days are longer in the summer and shorter in the winter. The hemisphere that's tilted closest to the Sun has the longest, brightest days because it gets more direct light from the Sun's rays.
Plz mark me brainliest if correct :)
During summer days, north pole of earth is exposed to sun because ofthe tilt of earth's rotational axis. Thus, The region of Earth experiencing summer is tilted toward the Sun while the region experiencing winter is tilted away from the Sun.
What is summer?Summer is a season in earth. There are different seasons in earth namely, summer, winter, spring, autumn etc. These season are arising due the revolution of earth around sun.
The distance of different regions of earth from sun changes due to the revolution of earth. Thus heat gained by these regions will be different in different seasons.
The north pole in summer gains more heat and light energy because of tilt in the axis of earth is towards the sun. Hence, the day time will be longer in summer than the winter. In winter, the earth is relatively apart from sun and thus tilt is and gains less light and heat .
To find more on seasons, refer here:
https://brainly.com/question/19009677
#SPJ6
100 pts
HELP!!!!!!!!
Between steps 2 and 3, the chemical energy in the coal is converted to
electrical energy
mechanical energy
transitional energy
heat energy
Answer:
It Is Transitional Energy.
Explanation: I Took The Quiz And Got It Wrong. It Showed That Transitional Energy Was The Correct Answer.
Answer:
heat energy
Explanation:
WHICH OF THE FOUR COMPOUNDS HAS BONDS WITH THE GREATEST DEGREE OF POLARITY (MOST POLAR)?
Answer:
I NEED TO KNOW THIS TOO
Explanation:
IVE BEEN LOOKING FOR THE ANSWER
Match the term with its description.
Match Term Definition
Chloroplast A) A green pigment present in all plants that absorbs light to provide energy for photosynthesis
Chlorophyll B) An organelle that contains chlorophyll and in which photosynthesis takes place
Energy C) A capacity to do work that can produce physical changes within living and nonliving systems
Glucose D) A type of sugar that is produced during photosynthesis to store chemical energy
Answer:
Chloroplast: An organelle that contains chlorophyll and in which photosynthesis takes place
Chlorophyll: A green pigment present in all plants that absorbs light to provide energy for photosynthesis
Energy: A capacity to do work that can produce physical changes within living and nonliving systems
Glucose:A type of sugar that is produced during photosynthesis to store chemical energy
hope it helps!
Answer: look at picture for the answer, and I showed that I got it right as well. It was worth 4 points and I got all 4. Brainiest please, if you don't mind <3
18. Which statement about photosynthesis is FALSE?
a
Tilmy green pigment chlorophyll captures light
energy
b Oxygen is needed as a reactant to produce
glucose
The process converts light energy from the
csun into chemical energy in the bonds of
glucose.
d
Carbon dioxide is needed as a reactant to
produce glucose.
Which statement about photosynthesis is FALSE?
Answer:
b. Oxygen is needed as a reactant to produce
glucose is the incorrect statement here
Explanation:
plants uses simple raw materials to prepare their food , which includes water ( H2O ) and Carbon dioxide ( CO2 ).
and traps sunlight by Green pigments known as chlorophyll and stores these energy in bonds of glucose molecules
so ,
after this reaction glucose and oxygen is formed as products
● hence we conclude that Oxygen is not needed as a reactant to produce glucose , oxygen is the bi product formed during photosynthesis.
what does our life have in common with the periodic table, What is the relationship between the world around us and the periodic table?
Answer:
Summary. To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.
Explanation:
Newton's first law of motion explains how
affects an object's motion. According to
Newton's first law, an obiect at rest will stay at
Answer:
rest until and unless an external force is applied.
what is the balanced chemical equation for sulphuric acid and zincoxide
Answer:
ZnO + H2SO4 = ZnSO4 + H2O | Chemical reaction and equation
Explanation:
gloogle
what water has 97% of water
Answer:
ocean
Explanation:
because its easy
Could someone pls help me if you know it!!
Answer:
Beautiftul, begging under F
honest, beginning in thrid line under A
hopeful, fifth line under F
Explanation:
Have ya helped anybody out today, how? And good job!
Answer:
I helped take care of my baby cousin :)
Explanation:
What is true about a chemical reaction
Answer: energy is transferred, but it can go to the products or the reactants.
Explanation: in a chemical reaction, the atoms and molecules that interact with each other are called reactants.
Match each atomic particle with the correct charge.
1. proton neutral
2. neutron positive
3. electron negative
The proton is a postitive charge, therefore, being 1 (proton) matched to positive. Whilst neutron (2) is matched to neutral. Thus electron (3) is matched to negative.
Someone please answer this...
Answer:
5446.8 J
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 50 g
Initial temperature (T₁) = 70 °C
Final temperature (T₂) = 192.4 °C
Specific heat capacity (C) = 0.89 J/gºC
Heat (Q) required =?
Next, we shall determine the change in the temperature. This can be obtained as follow:
Initial temperature (T₁) = 70 °C
Final temperature (T₂) = 192.4 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 192.4 – 70
ΔT = 122.4 °C
Finally, we shall determine the heat required to heat up the block of aluminum as follow:
Mass (M) = 50 g
Specific heat capacity (C) = 0.89 J/gºC
Change in temperature (ΔT) = 122.4 °C
Heat (Q) required =?
Q = MCΔT
Q = 50 × 0.89 × 122.4
Q = 5446.8 J
Thus, the heat required to heat up the block of aluminum is 5446.8 J
1. Which term best describes ultraviolet radiation?
a. Harmless
b. Invisible
c. Undetectable d. Beneficial
Which kind of worm has a closed circulatory system?
a planarian
a fluke
a pinworm
an earthworm
An earthworm has a closed circulatory system.
The earthworm has a closed circulatory system. An earthworm circulates blood exclusively through vessels. There are three main vessels that supply the blood to organs within the earthworm.
As important as they are alive for distributing nutrients and organisms and decomposing matter, worms are also very important in the food chain. They provide a crucial protein-rich source of food for other important species like birds, hedgehogs and frogs.
They may live up to eight years, though one to two is more likely. Full size for an earthworm varies among species, ranging from less than half an inch long to nearly 10 feet.
Learn more about earthworm here:- https://brainly.com/question/13938105
#SPJ1