Answer:
A, C, D (i think)
Explanation:
Answer:
The answer is D. Phootosynthesis is endothermic.
Explanation:
Please mark me brainliest!!!
What is the force that attracts an object toward the center of another object
Answer:
Gravitational force
Explanation:
Gravitational force is the mutual force of attraction between two objects or bodies.
Determine what charge to following atoms would have:
a. An atom having lost two electrons
b. An atom having lost six electrons
c. An atom having gained one electron
d. An atom having gained threeelectrons
an atom will lost negative 2
an atom will lost negative 6
an atom will gain positive 1
an atom will gain positive 3
If 28 grams of N reacts completely with 12 grams of H2, then how many
grams of NH6, will you
end with?
Answer:
Mass of NH₃ produced = 34 g
Explanation:
Given data:
Mass of nitrogen = 28 g
Mass of Hydrogen = 12 g
Mass of NH₃ produced = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 28 g/ 28 g/mol
Number of moles = 1 mol
Moles of hydrogen:
Number of moles = mass/molar mass
Number of moles = 12 g/ 2 g/mol
Number of moles = 6 mol
Now we will compare the moles of hydrogen and nitrogen with ammonia.
H₂ : NH₃
3 : 2
6 : 2/3×6 = 4 mol
N₂ : NH₃
1 : 2
Number of moles of ammonia produced by nitrogen are less thus it will act as limiting reactant.
Mass of ammonia produced:
Mass = number of moles × molar mass
Mass = 2 mol × 17 g/mol
Mass = 34 g
Answer:32 grams.
czts
True or false: Most of the mass of an atom is found in the electron layers.
Which pair of elements has the most physical and chemical properties in common?
Ge and Se
OK and Kr
Al and Ga
Ba and Bi
Answer:Al and Ga
Explanation:
I did it already
When 100.0 mL of 1.000 M HCl is reacted with 100.0 mL of 1.000 M NH4OH, the solution’s temperature increases 7.01 °C. Calculate LaTeX: \DeltaΔHreaction in units of kJ/mol. The specific heat of the salt solution is 4.184 J/g-°C and the density is 1.010 g/mL.
Do not use units or labels in answer. Make sure answer has the correct sig figs.
Answer:
Explanation:
volume of solution = 100 + 100 = 200 mL
mass of reaction mixture = 200 x 1.010 = 202 g
specific heat of solution mixture = 4.184 J/g-°C
heat evolved = mass x specific heat x rise in temperature
= 202 x 4.184 x 7.01
= 5924.63 J
100 mL of 1 M HCl
= .1 L of 1M HCl will contain .1 mole of HCl
.1 mole reacts with .1 mole of NH₄OH to make 5924.63 J of heat
1 mole reacts with 1 mole of NH₄OH to make 59246.3 J of heat
heat of reaction = 59246.3 J / mol
= 59.246 kJ / mol
= 59.3 kJ / mol .
Besides each sentence, write T if the sentence is mostly about using technology.
Write E if the sentence is mostly about using engineering.
1. Sarah sent a text message to Sam on her cell phone. T or E
2. The nurse used a digital thermometer to measure the patient's temperature. T or E
3. Henry tested three brands of blenders. He wanted to see which one made the creamiest smoothies. T or E
4. Workers at a factory use machines to bottle spring water. T or E
5. Jessica invented a better mousetrap. She patented her invention. T or E
6. Eli used math to figure out how much weight a bridge could hold. T or E
7. The nurse is using a new x-ray machine. T or E
8. Mayling is designing a refrigerator that uses less electricity. T or E
9. Guillermo's new snowblower makes snow removal faster and easier. T or E
10. Laptop computers are designed to be smaller, lighter, and easier to carry. T or E
Answer:
e
Explanation:
An atom with 8 protons, 6 neutrons, and 8 electrons has an atomic mass of___ amu. (Enter a whole number)
PLEASE HELP!!!
Answer:
Atomic Mass = 14 amu
Explanation:
Atomic No. = no. of proton = no. of electron = 8
So, The atom is Oxygen (O)
Now,
∴ Atomic Mass = no. of proton + no. of. neutron
= 8 + 6
Atomic Mass = 14 amu
Thus, The Atomic No. of Oxygen is 14 amu
-TheUnknownScientist
You place a ton of radioactive material into a lead box and close the box.
What radioactive decay particle(s) will escape the box?
Answer:
Beta particles and neutrons
Explanation:
Lead is not particular good for shielding beta particles and neutrons. Lead shielding is used for shielding x-rays and gamma-rays due to its high density and atomic mass.
Materials made with lead are used by people dealing with all kinds of radioactive particles to prevent radioactive poisonings.
But lead cannot effectively protect against beta particles and neutrons.
Complete and balance the precipitation reaction of K3PO4(aq) + MgCl2(aq)
Answer:
2K3PO4(aq) + 3MgCl2(aq) → Mg3(PO4)2(s) + 6KCl(aq)
Explanation:
K3PO4(aq) + MgCl2(aq)→ Mg3(PO4)2(s) + KCl(aq) (unbalanced)
2K3PO4(aq) + 3MgCl2(aq) → Mg3(PO4)2(s) + 6KCl(aq)
Reactants: Products:
K: 3x2=6 K: 1x6=6
P: 1x2=2 P: 1x2=2
O: 4x2=8 O: 4x2=8
Mg: 1x3=3 Mg: 3x1=3
Cl: 2x3=6 Cl: 1x6=6
Therefore the equation is balanced. Hope this helps.
If all other variables remain unchanged, what happens to the output force when the area of the input piston is doubled?
Answer:
1250N
Explanation:
This question is based on pascal's Law.
So By Pascal's Law
=
therefore =force on input piston =25N
= Force or weight on output person.
therefore after putting the values we get,
= (25x 1500)/30
=1250N
What is the current in a 160V circuit if the resistance is 10Ω?
[tex]\huge\boxed{16 Ampere}[/tex]
_____________________________________DATA:Voltage(V) = 160 volts
Resistance(R) = 10 ohms
Current(I) = ? Amperes
_____________________________________By the Equation,V = IR
Rearrange the equation,
I = [tex]\frac{V}{R}[/tex]
Substitute the variables,
I = [tex]\frac{160}{10}[/tex]
Simplifying the fraction,
I = 16 A
_____________________________________Best Regards,'Borz'This phenomena of a “broken” thermometer demonstrates the __________ of light waves.
Answer:it’s refraction
Explanation: reflection reflects something into another thing and refraction just bends
1) Describe the appearance of each of the three curves on your graph.
Answer:PROCESSING THE DATA To analyze the relationship between conductivity and volume, use this method to calculate the linear-regression statistics for your data. Then plot the linear regression curve on your graph. Note the conductivity of pure water: 0 uS/cm Conductivity Data Table Drops 1M NaCl(aq) 1M CaCl2(ag) (uS/cm) (uS/cm) 1 150 uS/cm 110 uS/cm 2 280 uS/cm 155 uS/cm 405 uS/cm 245 uS/cm 4 516 uS/cm 340 uS/cm 3 Use 1 mL = 20 drops to Plot Conductivity (in the y axis) vs. volume of each salt solution (x axis). Do a best fit straight line through these points. Make sure to use the pure water conductivity as your zero drop. On this same graph determine the slope for both the NaCl and CaCl2, make sure to use pure water as your 0 drop. Sketch your prediction of what you would expect the AlCl3 drops to look like.
Explanation:
a diatomic molecule like O2 is always _____ because electrons are shared ______.
A diatomic molecule like O2 is always Neutral because electrons are shared equally
From the question we are told
A diatomic molecule like O2 is always _____ because electrons are shared ______.
Generally
Oxygen molecule is diatomic molecule that is made up of two equally charged oxygen molecule and thereby creating a Neutral compound be cause its electrons are shared equally.
Therefore
The correct statement states
A diatomic molecule like O2 is always Neutral because electrons are shared equally
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True or false All chemical symbols have one letter.
Answer:
This is a false claim. All chemical symbols range from a singular to two letters. A prime example of this is cobalt; its chemical symbol is Co.
Electrons are found inside the nucleus, True or False?
Answer:
False their found outside of nucleus
Explanation:
3. Which physical property is shown by scratching one material with another?
O conductivity
O malleability
Ohardness
O viscosity
Sunlight can be limiting factor for population of plants is that true false
All combustion reactions release energy.
-True
-False
Answer:
true
Explanation:
All combustion reactions are chemical changes which release energy , hence the statement is true.
What are chemical changes?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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II. Ionic Equations
8. Write the complete ionic and net ionic equations for the reaction below:
2 AgNO3(aq) + CaCl2(aq) → 2 AgCl + Ca(NO3)2
Complete ionic:
Net ionic:
Answer:
Complete ionic: [tex]\begin{aligned}& \rm 2\, Ag^{+}\, (aq) + 2\, {NO_3}^{-} \, (aq) + Ca^{2+}\, (aq) + 2\, Cl^{-}\, (aq) \\ & \rm \to 2\, AgCl\, (s) + Ca^{2+}\, (aq) + 2\, {NO_3}^{-}\, (aq)\end{aligned}[/tex].
Net ionic: [tex]\begin{aligned}& \rm Ag^{+}\, (aq) + Cl^{-}\, (aq) \to AgCl\, (s)\end{aligned}[/tex].
Explanation:
Start by identifying species that exist as ions. In general, such species include:
Soluble salts.Strong acids and strong bases.All four species in this particular question are salts. However, only three of them are generally soluble in water: [tex]\rm AgNO_3[/tex], [tex]\rm CaCl_2[/tex], and [tex]\rm Ca(NO_3)_2[/tex]. These three salts will exist as ions:
Each [tex]\rm AgNO_3\, (aq)[/tex] formula unit will exist as one [tex]\rm Ag^{+}[/tex] ion and one [tex]\rm {NO_3}^{-}[/tex] ion. Each [tex]\rm CaCl_2[/tex] formula unit will exist as one [tex]\rm Ca^{2+}[/tex] ion and two [tex]\rm Cl^{-}[/tex] ions (note the subscript in the formula [tex]\rm CaCl_2\![/tex].) Each [tex]\rm Ca(NO_3)_2[/tex] formula unit will exist as one [tex]\rm Ca^{2+}[/tex] and two [tex]\rm {NO_3}^{-}[/tex] ions.
On the other hand, [tex]\rm AgCl[/tex] is generally insoluble in water. This salt will not form ions.
Rewrite the original chemical equation to get the corresponding ionic equation. In this question, rewrite [tex]\rm AgNO_3[/tex], [tex]\rm CaCl_2[/tex], and [tex]\rm Ca(NO_3)_2[/tex] (three soluble salts) as the corresponding ions.
Pay attention to the coefficient of each species. For example, indeed each [tex]\rm AgNO_3\, (aq)[/tex] formula unit will exist as only one [tex]\rm Ag^{+}[/tex] ion and one [tex]\rm {NO_3}^{-}[/tex] ion. However, because the coefficient of [tex]\rm AgNO_3\, (aq)\![/tex] in the original equation is two, [tex]\!\rm AgNO_3\, (aq)[/tex] alone should correspond to two [tex]\rm Ag^{+}\![/tex] ions and two [tex]\rm {NO_3}^{-}\![/tex] ions.
Do not rewrite the salt [tex]\rm AgCl[/tex] because it is insoluble.
[tex]\begin{aligned}& \rm 2\, Ag^{+}\, (aq) + 2\, {NO_3}^{-} \, (aq) + Ca^{2+}\, (aq) + 2\, Cl^{-}\, (aq) \\ & \rm \to 2\, AgCl\, (s) + Ca^{2+}\, (aq) + 2\, {NO_3}^{-}\, (aq)\end{aligned}[/tex].
Eliminate ions that are present on both sides of this ionic equation. In this question, such ions include one unit of [tex]\rm Ca^{2+}[/tex] and two units of [tex]\rm {NO_3}^{-}[/tex]. Doing so will give:
[tex]\begin{aligned}& \rm 2\, Ag^{+}\, (aq) + 2\, Cl^{-}\, (aq) \to 2\, AgCl\, (s)\end{aligned}[/tex].
Simplify the coefficients:
[tex]\begin{aligned}& \rm Ag^{+}\, (aq) + Cl^{-}\, (aq) \to AgCl\, (s)\end{aligned}[/tex].
In the game of pool, a player uses a stick called a cue to strike a white ball so
that it will hit another ball. The photo shows the white ball about to hit a blue
ball.
Through which path will mechanical energy be transferred to make the blue
ball move?
A. White ball-cue -- blue ball
B. Cue - white ball + blue ball
C. White ball pool table -- blue ball
D. Cue - pool table - blue ball
Helppp
Answer:
the answer is B: cue - white ball - blue ball.
Explanation:
The energy transfers from the stick to the white ball, then from the white ball to the blue ball. I also took this and it was correct!
The mechanical energy will be transferred through path A, which is White ball-cue -- blue ball. The correct answer is option A.
Mechanical energy is the sum of potential energy and kinetic energy in a system. It is the energy that is associated with the motion and position of an object or a system of objects.
When the player strikes the white ball with the cue, the cue transfers mechanical energy to the white ball. The white ball then collides with the blue ball, transferring some of its mechanical energy to the blue ball. This causes the blue ball to move. Therefore, option A is the correct answer.
Option B is incorrect because the cue does not come into contact with the blue ball, so it cannot transfer mechanical energy directly to the blue ball. Option C is incorrect because the pool table does not transfer mechanical energy to the blue ball. Option D is incorrect because the pool table does not transfer mechanical energy to the blue ball, and the cue does not come into contact with the pool table.Therefore, the correct answer is option A. White ball-cue -- blue ball.
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What do green plants capture from the sun?
a.
oxygen
b.
light energy
c.
carbon dioxide
d.
heat
The density of a metal is 11.4 g/cm3. How much volume (in cm3) would a sample of 30.5 g have?
The Concept:
We are given the density of a sample of the metal = 11.4 grams / cm³
and we need to find the volume occupied by a sample of 30.5 grams
For this solution, we will use dimensional analysis
from the given information, we can also say that the density of the metal is:
1 cm³ / 11.4 grams
If we multiply this value by 30.5 grams, the 'grams' in the numerator and the denominator will cancel out and we will be left with the volume occupied by 30.5 grams of the metal
Solving for the volume:
[tex]\frac{ 1 cm^{3} }{11.4 grams}[/tex] X 30.5 grams = (30.5 / 11.4) cm³
Volume of 30.5 grams of the sample = 2.68 cm³
Which energy transformation takes place in a generator?
Question 2 options:
A. mechanical to electrical
B. chemical to radiant
C. electrical to mechanical
D. radiant to electrical
1 point If the boy is pushing with 50N of force and the static friction resistance is 70N of force, what will happen? *
When Acid is added to the buffer, base within the buffer reacts with added
acid to resist pH change.
O a. True
O b. False
The density of an object is 1.34 g/cm3, Calculate the volume in m3 if it’s mass is 3.00 g
Answer:
0.0000022 m³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{3}{1.34} \\ = 2.238805...[/tex]
= 2.24 cm³
Converting to m³ we have
1 cm³ = 0.000001 m³
2.24 cm³ = 0.00000224 m³
We have the final answer as
0.0000022 m³Hope this helps you
What’s the volume of the solution?
Answer:
60.0 mL
General Formulas and Concepts:
Chemistry - Solutions
Reading a Periodic TableUsing Dimensional AnalysisMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
6.33 g CuNO₃
0.840 M Solution
Step 2: Identify Conversions
1 L = 1000 mL
Molar Mass of Cu - 63.55 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CuNO₃ - 63.55 + 14.01 + 3(16.00) = 125.56 g/mol
Step 3: Convert
[tex]6.33 \ g \ CuNO_3(\frac{1 \ mol \ CuNO_3}{125.56 \ g \ CuNO_3} )[/tex] = 0.050414 mol CuNO₃
Step 4: Find volume
Substitute: 0.840 M = 0.050414 mol / x LMultiply x on both sides: (x L)(0.840 M) = 0.050414 molDivide M on both sides: x L = 0.060017Step 5: Convert
[tex]0.060017 \ L(\frac{1000 \ mL}{1 \ L} )[/tex] = 60.0168 mL
Step 6: Check
We are given 3 sig figs. Follow sig fig rules and round.
60.0168 mL ≈ 60.0 mL
Which are products of a combustion reaction?
A. CO and H20
B. Hydrocarbons and H2O
C. O2 and H2O
D. Co, and H2O
