The bond angles marked a, b, and c in the molecule below are about __________, __________, and __________, respectively. Select correct answer. Select correct answer. 120°, 109.5°, 120° 90°, 90°, 90° 109.5°, 120, 109.5° 109.5°, 109.5°, 109.5° 109.5°, 109.5°, 90°

Answer:

The term biodiversity (from “biological diversity”) refers to the variety of life on Earth at all its levels, from genes to ecosystems, and can encompass the evolutionary, ecological, and cultural processes that sustain life.

or if you want a short answer:

The term “biodiversity” refers to the variety of living organisms.

Answer:

the term bioverisidy refer to the veriety of life on earth at all its levels from genes to ecosystem and ecompass the evolutionary ecological and cultural prosesses that sustain life

Answer:

E. 2 : 3

Explanation:

Aluminium carbonate is a neutral compound made by aluminium ion, Al³⁺ and carbonate ion, CO₃²⁻. As is neutral, the formula must be:

Al₂(CO₃)₃.

2 Al₃⁺ = 6 positives charges

3 CO₃²⁻ = 6 negative charges

Thus, the simplest whole number ratio between Al³⁺ and CO₃²⁻ must be:

2:3

And right answer is:

Answer:

80 day= 15 men

Explanation:

1 man takes = 80*15 = 1200 days

20 men take = 1200/20= 60 days

Answer:

80 days=15 men

Explanation:

hope it helps❣️

Answer: There are 0.373 kJ in 373 joules.

Explanation:

According to the standard conversion units 1 kJ is equal to 1000 J. This means that 1 J is equal to 0.001 kJ.

Hence, 373 joules is converted into kilojoules as follows.

[tex]1 J = 0.001 kJ\\373 J = 373 J \times \frac{0.001 J}{1 kJ}\\= 0.373 kJ[/tex]

Thus, we can conclude that there are 0.373 kJ in 373 joules.

Explanation:

When citric acid and baking soda react with one another, they change chemi- cally and form sodium ions, citric acid ions, carbon dioxide gas, and water. ... It also makes up the bubbles in carbonated drinks and is a gas we naturally exhale. Carbon dioxide gas is safe in the quantities produced in the activities.

Answer: its D 12 grams

Explanation: you just have to find the molar mass of carbon in the periodic table

Answer:

I guess the answer is compound

Explanation:

Coz compound it is on there playing with me again Go ahead and paste it in the class

Answer:

I'd 9 Coz is better than anything else I help so u need to other people that question don't be jealous of them

Answer: 5.13

Explanation: juss do it

Taking into account the definition of calorimetry, the water has absorbed 39,501 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

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.

In this case, you know:

Replacing in the definition of calorimetry:

Q = 4.18 [tex]\frac{J}{gC}[/tex]× 450 g× 21 C

Solving:

Q= 39,501 J

Finally, the water has absorbed 39,501 J.

Learn more about calorimetry:

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#SPJ2

Answer:

Compounds are represented by chemical formulas. Elements in a compound are represented by chemical symbols, and the ratio of different elements is represented by subscripts.

Answer:

In the electrolysis of water the gases collected in anode is oxygen and in cathode is hydrogen.

It is because water contains two molecules as compared to one molecules of oxygen.

If Dil.H,So, is not added in water then water doesn't conduct electricity.

Please make me brainiest answer

Answer:

the answer is 211106 is better than anything else about u and then let's go play with kids like that first time in the class ohh ok

Answer:

50%

Explanation:

Answer:

they would benefit

Explanation:

they would benefit because we can move more machines that reduce pollution in those countries.

Answer:

Explanation:

False

Answer:

false

Explanation:

took the test

Answer:

B: Fe3+

Explanation:

Usually in oxidation reactions, the oxidation number of a monatomic ion is the same as the charge on the ion, for example: oxidation number for Na^(+) is +1 , while in S^(2-), oxidation number is -2.

Now, from the activity series of metals in aqueous solution which I attached, we will see that iron (Fe) is easily oxidized than Nickel (Ni2+) and hydrogen (H+).

So we are left with Fe^(2+) and Fe^(3+).

Now, an increase in oxidation number means the more likely to be oxidized.

Thus, Fe^(3+) is the most easily oxidized.

Answer:

I don't know if this is right but..

Explanation:

It is important to keep the volume of the reactant constant because it ensures that the temperature change was the result of the reactants consumed

Why it is necessary to keep the to drops in the test tubes consistent is:

Conclusively, Why it is necessary to keep the to drops in the test tubes consistent is:

Learn more from

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We are given:

Mass of ice = 100 grams

Initial temperature = -50°C

Final Temperature = -10°C

We know that the specific heat of ice is 2.09 joules / (gram * °c)

Heat Absorbed:

We know that:

ΔQ = mcΔT                                                    [where ΔQ is the heat absorbed]

ΔQ = (100 grams)(2.09)(-10 - (-50))

ΔQ = (100)(2.09)(40)

ΔQ = 8360 Joules

Answer:

B

Explanation:

Answer:

A

Explanation: got it right

Answer:

790 K

Explanation:

Step 1: Given data

Step 2: Convert 23.0 °C to Kelvin

We will use the following expression.

K = °C + 273.15 = 23.0 + 273.15 = 296.2 K

Step 3: Calculate the final temperature of the gas

Assuming constant pressure and ideal behavior, we can calculate the final temperature of the gas using Charles' law.

T₁/V₁ = T₂/V₂

T₂ = T₁ × V₂/V₁

T₂ = 296.2 K × 32.0 L/12.0 L = 790 K

Answer:

its actually c

Explanation:

Answer:

9.493 e-01

Explanation:

Given that Titan's temperature at thermal equilibrium = 100 K

Determine the fraction of the atmosphere that is methane

at an altitude of 2 km

applying Ideal gas law

P = Po e^ -Z/k ---- ( 1 )

In this question Z  = M₀ g z  ( replace -Z in  equation 1 with M₀gz )

P = Po e^- M₀gz / RT ------ ( 2 )

where : Mo = 16 * 10^ -3 kg/mol , g = 1.35 m/s^2 , z = 2 * 10^3 m , R = 8.3 J/mol.k , T = 100 k

insert values Back to equation 2

P = Po e^-0.052

P = 0.9493 Po

hence the fraction of the atmosphere that is methane

= P / Po = 9.493 * 10^-1

= 9.493 e-01

Answer: D.

Explanation:

6.02 * 10^-23

Answer:

235.2 L ( if the sample is under S.T.P condition )

Explanation:

For any gas at S.T.P (0°c, 1 atm), 1 mole=22.4 L

Thus, for  10.5 mole of Ar, there are 10.5*22.4=235.2 L

Answer:

B part is the correct answer

Answer: Infusion time is 5.5 h

Explanation:   Time is   470 ml / 85 ml/h =  5.5 h

Answer:

V2 = 95.65 cm^3 or 96 cm^3 (depends on if you want to round up or not)

Explanation:

Charles law is V1 / T1 = V2 / T2 (1 means initial and 2 means final condition)

For Charles law, you must use kelvin scale for temperature. So to convert from C to K, you add 273.15

T1 = 26 +273.15 = 299.15 K

T2 = 13 + 273.15 = 286.15 K

Now plug in the values,

100 / 299.15 = V2/286.15

V2 = 95.65 cm^3 or ~ 96 cm^3

The answer should make sense because if they have a direct relation, if one goes down then the other goes down. For final condition, we lowered the temperature so our volume should have decreased too and it did (we went from 100 to 96 cm^3)

Answer:

10%

Explanation:

The percent by volume of acetone is given by the following formula:

% v/v = Volume of acetone / Total Volume * 100%

Now we calculate the total volume of the solution:

Total Volume = Volume of Acetone + Volume of Water

Total Volume = 50 mL + 450 mL = 500 mL

Then we calculate the percent by volume:

% v/v = 50 mL / 500 mL * 100 % = 10%