Answer:
similarities: they both carry a charge
differences:
polyatomic ion- composed of more than one atom
monatomic ion- composed in a single atom.
a'Zorria Ward
An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is needed to determine the velocity of the elevator?
the direction the elevator traveled
how long the elevator was stationary
O how many times the elevator stopped
O the total mass of the elevator plus anything in it
Answer:
Velocity includes Direction
So you need to know if it was going up or down
Explanation:
25. What is a subdivision of a family? *
O kingdom
O domain
O genus
O species
Chlorine gas and solid phosphorus combine to produce phosphorus trichloride gas.
Write a balanced chemical equation for this reaction.
Which form of energy increases in an object as you raise it higher off the ground?
A. Electrical
B. Kinetic
C. Mechanical
D. Potential
Answer:
D. Potential
Explanation:
Answer:
Potential
Explanation:
Gravitational potential is the energy the object has of it's position of the earth's surface. When the object is lifted, work is done. When work is done in raising the height of an object, energy is transferred as a gain in the gravitational potential energy of the object.
Sound waves vibrate your eardrum, which moves bones in your middle
ear. The soundwaves then pass through a fluid in your inner ear, and on to
tiny hairs that send signals to the brain.
A. True
B. False
Answer: A. True
Explanation:
A sample of aluminum, which has a specific heat capacity of 0.897·J·g−1°C^−1 , is put into a calorimeter (see sketch at right) that contains 300.0g of water. The aluminum sample starts off at 94.5°C and the temperature of the water starts off at 21.0°C .When the temperature of the water stops changing it's 23.8°C .The pressure remains constant at 1atm .Calculate the mass of the aluminum sample.
Answer: The mass of aluminium sample is 55.4 gram
Explanation:
[tex]Q_{absorbed}=Q_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
[tex]m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)][/tex]
where,
[tex]m_1[/tex] = mass of aluminium = ?
[tex]m_2[/tex] = mass of water = 300.0 g
[tex]T_{final}[/tex] = final temperature = [tex]23.8^0C[/tex]
[tex]T_1[/tex] = temperature of aluminium = [tex]94.5^oC[/tex]
[tex]T_2[/tex] = temperature of water = [tex]21.0^oC[/tex]
[tex]c_1[/tex] = specific heat of aluminium = [tex]0.897J/g^0C[/tex]
[tex]c_2[/tex] = specific heat of water = [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)][/tex]
[tex]-[m_1\times 0.897\times (23.8-94.5)^0C]=[300.0g\times 4.184\times (23.8-21.0)][/tex]
[tex]m_1=55.4g[/tex]
Therefore, the mass of aluminium sample is 55.4 gram
Please HELP! Which of the following is a reason why day turns into night on Earth?
Earth's axis is tilted
Earth revolves around the Sun
Earth rotates from west to east
Earth's gravity pulls on the moon
Answer:
Earth rotates from west to east
Explanation:
hope it helps
Somebody help me asap please giving brainliest
Answer:
fire > rocks > air
Which of the following is true according the the Arrhenius theory of bases?
Question 5 options:
A strong base increases the OH- ion concentration in an aqueous solution.
A strong base increases the H+ ion concentration in an aqueous solution.
A strong base decreases the OH- ion concentration in an aqueous solution.
A strong base decreases the H+ ion concentration in an aqueous solution.
Answer:
A strong base increases the OH- ion concentration in an aqueous solution.
Explanation:
According to the Arrhenius theory, acids donate H+ and bases donate OH- to a solution.
Field foresters are associated with which of the following types of forestry?
urban
national
international
private sector
Answer:
urban and private sector
Explanation:
By the reaction between
H3PO4 and Ca(OH)2,
Can be formede:
a. Ca(HPo4)2,
b. СaHP4
c. Ca(H2PO4)2
d. Ca2HP02
e.Сa3(PO4)2
the correct answers : b, c, e
the question is:
I am preparing for an admittion test in chemistry, I face this kind of questions which I dont how to understand or if I should only memorize.
I appreciate all your help.
thank you alot.
Answer:
ANSWER is E
Explanation:
2H₃PO₄ + 3Ca(OH)₂→ 6H₂O + Ca₃(PO₄)₂
Answer:
First step is to find what the products would be. Since this seems to be a double displacement, you get: H3PO4(aq)+Ca(OH)2(aq)→ H2O(L)+Ca3(PO4)2(s)
You know the products because H has a charge of +1, so PO4 must have a charge of -3, and since OH has a charge of -1, Ca must be +2. Then make each compound have a net charge of 0. H20 is a liquid since aq solutions have liquid water. Ca3(PO4)2 is a solid, use the solubility rules.
Lastly, balance the equation: 2H3PO4(aq)+3Ca(OH)2(aq)→ 6H2O(L)+Ca3(PO4)2(s)
So the salt formed is Ca3(PO4)2
Compare and contrast the three states of matter liquid, solid, and gas.
Answer:
For example: water is liquid, ice is solid, and water vapor is gas
Explanation:
30 points for answering: Solve all 4 questions.
1. Listening to the radio is an example of _______ energy.
A. sound
B. light
C. heat
D. chemical
2. Turning on and listening your favorite TV show is an example of:
E. light energy to kinetic energy
F. electrical energy to sound energy
G. heat energy to light energy
H. sound energy to chemical energy
3. Eating a taco is an example of ______ energy.
I. light
J. chemical
K. sound
L. heat
4. A rabbit eating grass and then running away from a coyote is an example of:
M. light energy to heat energy
N. sound energy to light energy
O. chemical energy to electrical energy
P. chemical energy to mechanical energy
Answer:
1. Sound
2.heat energy to light energy
3.chemical
4.chemical energy to electrical energy
Explanation:
Answer:
1. A
2. F
3. J
4. P
Explanation:
1. A. sound
2. F. electrical energy to sound energy
3. J. chemical
4. P. chemical energy to mechanical
Is this statement true or false?
One body system maintains the constant internal environment of the whole body.
explain the variation of basicity in group III A members down the group
Answer:
Explained below
Explanation:
Group 3A elements are made up of the metalloid - boron (B) and other metals such as Aluminum (Al), gallium (Ga), indium (In), & thallium (Tl).
Now, as we go down the group, the size of the central atom will increase thereby causing the lone pair to become delocalized over a larger volume space. Thus, it's not readily available for donation and thus basicity increases
Give the hybridization for the C in HCN
Answer:
[tex]\huge\boxed{sp \ hybridization}[/tex]
Explanation:
In HCN,
Carbon is singly - bonded ( 1 sigma bond ) to Hydrogen while triply - bonded ( 1 sigma, 2 pi bonds) to Nitrogen.
Thus, the Stearic No. for Carbons is:
= No. of sigma bonds + No. of lone pairs
= 2 + 0
= 2
According to Stearic No.:
=> sp = 2
=> sp² = 3
=> sp³ = 4
Hence,
The hybridization of C in HCN is sp.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Hey! I was wondering how to get the solution to this question!
A solution was prepared by dissolving 0.541 g of benzoic acid (HC6H5COO) in 100 mL of
water. The pH was measured to be 2.78. What is the Ka for benzoic acid?
Answer:
6.22 × 10⁻⁵
Explanation:
Step 1: Write the dissociation reaction
HC₆H₅COO ⇄ C₆H₅COO⁻ + H⁺
Step 2: Calculate the concentration of H⁺
The pH of the solution is 2.78.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.78 = 1.66 × 10⁻³ M
Step 3: Calculate the molar concentration of the benzoic acid
We will use the following expression.
Ca = mass HC₆H₅COO/molar mass HC₆H₅COO × liters of solution
Ca = 0.541 g/(122.12 g/mol) × 0.100 L = 0.0443 M
Step 4: Calculate the acid dissociation constant (Ka) for benzoic acid
We will use the following expression.
Ka = [H⁺]²/Ca
Ka = (1.66 × 10⁻³)²/0.0443 = 6.22 × 10⁻⁵
Do Newton's Laws still apply in space?
Answer:
Yes, they work in space. I forgot an example, will edit the post when I found it
Hope this helps!
When an object is falling, which type of energy does it continue to gain?
A. Potential
B. Kinetic
C. Atomic
D. Sound
Answer:
B Kinetic
Explanation:
Kinetic energy is the energy of a object in motion
Baking soda (NaHCO3, 84.0 g/mol) requires acids from other ingredients to generate the carbon dioxide needed to make bread rise. The following equation describes this reaction, where HB is some unspecified acid. If 20.4 g of baking soda are used in a recipe and enough acid is present for a complete reaction, how many moles of carbon dioxide are generated?
HB + NaHCO3 ⟶ H2O + CO2 + NaB
a. 0.243 mol
b. 0.204 mol
c. 0.334 mol
d. 0.232 mol
e. 0.464 mol
4. How many moles of Cl2, are obtained by the
decomposition of 6.3 moles of POCI3?
Answer:
6.3moles
Explanation:
The balanced chemical equation for the decomposition of phosphorus oxychloride (POCl3) is as follows:
POCl3 → POCl + Cl2
Based on the above decomposition reaction, it shows that;
1 mol of POCl3 will decompose to give 1 mole of Cl2
Hence, 6.3 moles of POCI3 will give 6.3 moles of Cl2.
Solid iron pellets are heated, melted and drawn into wires. This is an example of a chemical reaction.
O True
O False
Answer:
False
Explanation:
A change of state is not an example of a chemical reaction.
A chemical reaction cannot be reversed. This example however, can be. You can melt the wire down and them form it back into iron pellets
Answer:
False
Explanation:
The key to a chemical reaction is "irreversible change". If you can change it back to what it was before, it's not a chemical reaction. This is an example of a physical change.
The degree of order of matter is directly proportional to the cohesive forces that hold the matter together. In other words, the more organized the state of matter, the stronger the “glue” that holds it together. Given the above which one of the states has the strongest cohesive forces?
A. Liquid
B. Solid
C. All states must have the same cohesive forces
D. Gas
Answer:
B. Solid
Explanation:
As the problem states, the stronger the cohesive forces of a substance, the more ordered that substance is.
Asking which state has the strongest cohesive forces is the same as asking which state is the most organized.
Solids are more organized than liquids (as solids have a definite shape and volume). Liquids are more organized than gases (as liquids have a definite volume).
STEP 7: LEAD
Initial temperature of metal = 100
✓°C
Initial temperature of water = 22.6
✓ °C
Final temperature of both = 23.3
°C
Subtract to find the temperature
changes for the water and the metal.
AT (water) = 0.7 ✓ °C
AT (metal) = 76.7 ✓ °C
Answer:
answer is 76
Explanation:
pls mark me brainliest right
Answer:
0.7
76.7
this is for (LEAD) the last one
What are the products from the following double - replacement reaction ? BaCl 2(aq) +K 2 SO 4(aq) a . BaSO 3 and KCI b. and KClO 4 c. BaSO 3 KClO 4 d. BaSO 4 and KClO 4 e . BaSO 4 and KCI
Answer:
e. BaSO4 and KCI.
Explanation:
Hello there!
In this case, given the reactants side:
[tex]BaCl_ 2(aq) +K_ 2 SO_ 4(aq)[/tex]
It is possible to realize that after the reaction takes place barium replaces potassium and therefore barium sulfate and potassium chloride are formed:
[tex]BaCl_ 2(aq) +K_ 2 SO_ 4(aq)\rightarrow BaSO_4(s)+2KCl(aq)[/tex]
Therefore, the products turn out to be e. BaSO4 and KCI.
Best regards!
Which two actions can people take to protect themselves during a heat
wave?
O A. Eat extra food
O B. Get plenty of exercise
C. Drink lots of water
D. Stay in the shade
Answer:
Stay in shade
Explanation:
aaaaaadffgghujollknnbcczzdfuomnb xdf
Answer:
c answer and d is correct answers
Explanation:
i hope helpful to us
how are elements classified organized?
11) A fixed amount of gas at 25.0 °C occupies a volume of 8.66 L when the pressure is 629 torr. Use
Charles's law to calculate the volume (L) the gas will occupy when the temperature is increased to
112 °C while maintaining the pressure at 629 torr.
A) 1.93
B) 38.8
C) 11.2
D) 9.26
E) 6.70
Answer:
Option C. 11.2 L
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 25.0 °C
Initial volume (V₁) = 8.66 L
Final temperature (T₂) = 112 °C
Pressure = constant
Final volume (V₂) =?
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 25 °C
Initial temperature (T₁) = 25 °C +273
Initial temperature (T₁) = 298 K
Final temperature (T₂) = 112 °C
Final temperature (T₂) = 112 °C + 273
Final temperature (T₂) = 385 K
Finally, we shall determine final volume of the gas. This can be obtained as follow:
Initial temperature (T₁) = 298 K
Initial volume (V₁) = 8.66 L
Final temperature (T₂) = 385 K
Pressure = constant
Final volume (V₂) =?
V₁/T₁ = V₂/T₂
8.66/298 = V₂/385
Cross multiply
298 × V₂ = 8.66 × 385
298 × V₂ = 3334.1
Divide both side by 298
V₂ = 3334.1 / 298
V₂ = 11.2 L
Thus, the final (i.e new) volume of the gas is 11.2 L
6.
List two possible hazards that occur when clients/family members smoke near oxygen.
Describe two actions the PSW could take to avoid these hazards in the workplace and
ensure their safety as well as the client's. (4 Marks)
Hazard one
Hazard two
Actions
Write balanced complete ionic equation for
CaS(aq) + CaCl2 (aq) –> CdS(s) + CaCl2 (aq).
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)
Explanation:
CaS (aq) + CdCl₂ (aq) –> CdS (s) + CaCl₂ (aq)
The complete ionic equation for the above reaction can be obtained as illustrated below:
In solution:
CaS (aq) —> Ca²⁺(aq) + S²⁺(aq)
CdCl₂ (aq) —> Cd²⁺(aq) + 2Cl¯(aq)
CaS (aq) + CdCl₂ (aq) –>
Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)
