Answer:
A base forms hydroxide ions in water.
Hope this helps
If you had to choose to live on the moon or mars, explain why you would choose
one over the other based of the science that you know (give at least 4 reasons
and use evidence to support them)( 10 points)
Answer:
I would choose to live on mars
Explanation:
I would choose to live on mars because not only is it the most habitable planet in our solar system other than Earth, there is enough gravity on Mars to be believed that our bodies can adapt. It is also not too hot or cold for us. There is soil that water can be extracted from, and we can also use solar panels to collect energy. Although we would have to use advanced technology when going there, but I think these are a few reasons why I would prefer living on Mars over the Moon.
How many moles of sugar, C12H22O11, are in 52 mL of a 0.50 M solution?
Answer:
M2=(6.0)(25.0)/500 =0.3
Explanation:
The mole concept will most likely be used in
Answer:
determining how many ozone molecules are lost in the atmosphere
Pls Mark as Brainliest!!! if this helps..
How many total atoms from Carbon are present on the reactant side?
20 points
2CH2+202
O2+HC4
5
2
1
3
Answer:
2 carbon atoms/molecules are present on the reactant side.
hope it helps!
________________ substances have an equal amount of H+ and OH- ions in solution.
Answer:
Water, and other neutral
Explanation:
That means those substances have pH = 7.
When the amount of H+ is more than the amount of OH- in solution, the substance is acidic ( eg.: Lemon juice ). pH < 7
When the amount of H+ is less than the amount of OH- in solution, the substance is basic ( eg.: Baking soda ). pH > 7
What is the answer ?
Answer:
b
Explanation:
Electromagnetic waves are waves that have no medium to travel whereas mechanical waves need a medium for its transmission.
5.6 M KCl has 600. mL of water. How many grams are in this solution?
Answer:
250.656
Explanation:
find no of moles in the 600ml=3.36,find molar mass of kcl(35.5+39,if 1mole=74.6g what about 3.36moles
Which of the following are characteristics of heterogeneous mixtures
A. distinguishable components
B. evenly distributed components
C. particles too small to be seen with a microscope
D. components in varying proportions
E. particles that may settle
Answer:
c
Explanation:
Which best describes heating by convection?
Air molecules touch the warm ground, heating it up.
Warm air rises and takes heat with it; eventually it cools and sinks.
Sunlight travels through empty space without the aid of fluids or solids.
balancing equations
Answer:
4. 1HCL + 1NAOH- I NACL+1H2O
Explanation:
there is 2 hydrogens on the left side of the equation, balancing out to the other side of the equation. everything else would be balanced out too
a. What is the atomic weight of one mole of CH4?
b. How many moles in 64 grams of CH4?
Answer:
A. 16 grams.
B. 4 mol.
Explanation:
A. To find the atomic weight of one mole of CH4, we can simply reference the periodic table and find the atomic weights of each element:
12.0+4(1.0)= 16.0 g.
B. To find the amount of moles in 64 grams, we can simply divide:
64.0÷16.0= 4 mol.
The specific heat of iron is 0.107 cal/g x oC. How much heat is transferred when a 24.7 kg iron ingot is cooled from 880 oC to 13 oC?
Answer:
heat = 229139.43 cal
Explanation:
given data
specific heat of iron is 0.107 cal/g-°C C = 0.4494 J/g°C;
Mass of iron = 24.7 kg = 24700 g
temperature T1 = 880°C
temperature T2 = 13°C
solution
we know that Heat lost that is express as
heat loss = mcΔT .........................1
here m is the mass and c is specific heat capacity of iron and ΔT is the change in temperature
so here change in the temperature is = 880°C - 13°C
change in the temperature = 867°C
so put here value and we get
heat = 24700 × 0.107 cal/g-°C × 867°C
heat = 229139.43 cal
how does the sun light affect earths climate
Answer:
The Sun powers life on Earth; it helps keep the planet warm enough for us to survive. It also influences Earth’s climate: We know subtle changes in Earth’s orbit around the Sun are responsible for the comings and goings of the past ice ages. But the warming we’ve seen over the last few decades is too rapid to be linked to changes in Earth’s orbit, and too large to be caused by solar activity
Explanation:
How much NaOH (in grams) is needed to prepare 463 mL of solution with a pH of 10.020?
Answer: [tex]1.94\times 10^{-3}g[/tex] of NaOH
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
Putting in the values:
[tex]10.020=-\log[H^+][/tex]
[tex][H^+]=9.55\times 10^{-11}[/tex]
[tex][H^+][OH^-]=10^{-14}[/tex]
[tex][OH^-]=\frac{10^{-14}}{9.55\times 10^{-11}}=1.05\times 10^{-4}M[/tex]
[tex]NaOH\rightarrow Na^++OH^-[/tex]
[tex]Molarity=\frac{moles\times 1000}{\text {Volume in ml}}[/tex]
[tex]1.05\times 10^{-4}M=\frac{moles\times 1000}{463ml}[/tex]
moles = [tex]4.86\times 10^{-5}[/tex]
Mass of [tex]NaOH=moles\times {\text {Molar mass}}=4.86\times 10^{-5}\times 40=1.94\times 10^{-3}g[/tex]
Thus [tex]1.94\times 10^{-3}g[/tex] of NaOH is needed to prepare 463 mL of solution with a pH of 10.020
what is the radioactive nucleus before it decays
Answer:
Alpha decay is one type of radioactive decay, in which an atomic nucleus emits an alpha particle, and thereby transforms (or "decays") into an atom with a mass number decreased by 4 and atomic number decreased by 2.
Explanation:
What is the meaning of the red moon??
Answer:
the red moon occurs during lunar eclipse
Explanation:
The reddish coloration arises because sunlight reaching the Moon must pass through a long and dense layer of Earth's atmosphere, where it is scattered
When a chemical reaction occurs,
O a phase change takes place
o the physical and chemical properties of the products are different from the reactants
O the physical and chemical properties of the reactants are the same as the properties of the products
o the compounds can be separated by physical means
Answer:
D. the physical and chemical properties of the products are different from the reactants
Explanation:
What is heat of vaporization?
ОА.
It is the heat required to change a substance's temperature by 1°C.
OB.
It is the heat required to change a gram of substance from a solid to a liquid.
Ос.
It is the heat required to change a substance from a solid directly to a gas.
OD.
It is the heat required to change a gram of substance from a liquid to a gas.
O E. It is the heat required to separate one substance into two substances.
Answer:
Your answer is D. It is the heat required to change a gram of substance from a liquid to a gas.
You are in the room with several objects, the temperature in the room is 21 celcius, what can you assume about the temperatures of the objects in the room?
Answer:the objects will be about the same temperature as the room
Explanation:
Review the following chemical equation: Find the molar ratio between C6H6 to
carbon dioxide, CO2. 2C6H6 + 1502 YEILDS 6H20 - 12C02
Answer:
[tex]\frac{1}{6}[/tex]
Explanation:
Molar ratio is defined as the ratio of number of moles of reactants or products in a balanced chemical equation.
In this balanced equation, the number of C6H6 molecules react to form 12 CO2 molecules.
Thus, the molar ratio between C6H6 to carbon will be equal to 2 moles of C6H6 divided by 12 moles of CO2
[tex]\frac{2}{12}\\\frac{1}{6}[/tex]
Write the beta decay equation for the following isotope: 15/6 C?
Answer:
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{N}[/tex]
Explanation:
The unbalanced nuclear equation is
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, ?[/tex]
Let's write the question mark as a nuclear symbol.
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{Z}^{A}\text{X}[/tex]
The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.
Then
15 = 0 + A, so A = 15 - 0 = 15, and
6 = -1 + Z, so Z = 6 + 1 = 7
Then, your nuclear equation becomes
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{X}[/tex]
Element 7 is nitrogen, so the balanced nuclear equation is
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{N}[/tex]
Use the drop-down menus to select the correct answers to complete the paragraph.
The building blocks of matter are called . A substance made up of the same kind of atoms is called a(n) . elements lose particles. This makes them .
Explanation:
The building blocks of matter are called atoms
A substance made up of the same kind of atoms is called a element
unstable elements lose particles
This makes them radioactive
(i dd the assignment)
The correct words are:
AtomsElementParticlesRadioactiveAn atom is the smallest and indivisible part of matter.An element is made up of atoms with an equal amount of protons in them. A particle is what makes up an element.Radioactivity occurs when there is a sudden burst of radiation.Read more here:
https://brainly.com/question/24612906
How is a lithium atom (Li) different from a lithium ion (Li+)?
Li has fewer electrons than Li+
Li has more electrons than Li+
Li has fewer protons than Li+
Li has more protons than Li+
Answer:
Li has fewer protons than Li+
Balance the following equation by adding the correct mole numbers.
P⁴+Cl²->PCl³
Hey there!
P₄ + Cl₂ → PCl₃
First, let's balance Cl.
There are 2 on the left, and 3 on the right.
To balance this, let's put a coefficient of 3 in front of Cl₂ and a coefficient of 2 in front of PCl₃.
P₄ + 3Cl₂ → 2PCl₃
Now we have 6 on the left and 6 on the right.
Next, let's balance P.
There are 4 on the left and 2 on the right.
Let's change the coefficient in front of PCl₃ from 2 to 4.
P₄ + 3Cl₂ → 4PCl₃
There are now 4 P on each side.
However, now Cl is unbalanced, with 6 on the left and 12 on the right.
We can change the coefficient in front of Cl₂ from 3 to 6.
P₄ + 6Cl₂ → 4PCl₃
So now, we have 4 P on each side and 12 C on each side.
This is our final balanced equation.
Hope this helps!
Answer:
1:1
Explanation:
Took test
Which of the following is the energy of moving electrons?
a. kinetic energy
b. thermal energy
c. nuclear energy
d. electrical energy
Answer:
Electrical energy
Explanation:
Electrical energy is caused by the moving of electrons.
hope it helps!
What is the specific heat capacity for a 5 g sample of metal that absorbs
100 Joules of heat energy when its temperature changes from 10 degrees
C to 40 degrees C?*
A) 15, 000 J/gC
B) 2 J/go
C)0.67 J/gC
D) 0.50 J/go
Answer:
The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
The amount of heat that a body receives or transmits is determined by the following expression:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
This expression indicates that between heat and temperature there is a direct proportional relationship.
In this case:
Q= 100 Jc= ?m= 5 gΔT= Tfinal - Tinitial= 40 °C - 10 °C= 30 °CReplacing:
100 J= c*5 g* 30°C
Solving:
[tex]c=\frac{100 J}{5 g* 30C}[/tex]
c= 0.67 [tex]\frac{J}{g*C}[/tex]
The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]
Which is usually associated with a slower reaction rate?
A. using a whole solid in the reactants
B. adding heat energy to the reactants
C. adding food coloring to the reactants
D. using a strong solution of the reactants
Which element easily loses one electron to form a positive ion? A. Magnesium (Mg) B. Lithium (Li) C. Nitrogen (N) D. Fluorine (F)
Answer: Lithium (Li)
Explanation:
Once it loses its only valence electron, there’s no longer a negative charge.
please helpppppppppp
Select the TRUE statements about the carbon cycle
The carbon cycle is the process in which carbon travels from the atmosphere into organisms and the Earth and then back into the atmosphere.
Plants take carbon dioxide from the air and use it to make food.
Animals eat food and the carbon is stored in their bodies or released during cellular respiration.
Water (H2O) is cycled around the Earth
the carbon cycle is the process in which carbon travels from the atmosphere into organisms and the earth and then back into the atmosphere
What is the correct answer? Please
Answer:
c
Explanation:
