Please help :( foundation gcse

Answer:

symbol?

Explanation:

Answer:

The line with spikes and semicircles is a stationary front, it brings days of steady rain.

Explanation:

L means Low pressure, it brings stormy weather with strong winds.

H means High pressure, it brings fair weather and light winds.

The line with spikes is a cold weather front, it brings thunderstorms and colder

temperatures.

The line with spikes and semicircles is a stationary front, it brings days of steady rain.

Answer:

2.47L

Explanation:

Using the combined gas law equation as follows:

P1V1/T1= P2V2/T2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

P1 = 705mmHg

P2 = 760mmHg (STP)

V1 = 3.00L

V2 = ?

T1 = 35°C = 35 + 273 = 308K

T2 = 273K (STP)

Using P1V1/T1= P2V2/T2

705 × 3/308 = 760 × V2/273

2115/308 = 760V2/273

Cross multiply

308 × 760V2 = 2115 × 273

234,080V2 = 577,395

V2 = 577,395 ÷ 234,080

V2 = 2.47L

Answer:

I think 50 grams only because you have pour 50 grams of solute in to 800 grams of solvent.

Answer:

See Explanation

Explanation:

A biosphere is a zone of life found on earth. Since the artificial biosphere has all the elements that support and sustain human life, then there must also be soil in the artificial biosphere.

If that is the case, then we can engage in massive tree planting. Trees take in carbon dioxide and release oxygen. Hence if a large number of trees are planted all over the artificial biosphere, the trees will eventually produce large enough oxygen to support human life overtime.

Answer:

ФОТОГРОФИРУЙ

ИЛИ НАПИШИ

В КОМЕНТЫ

Answer:

See Explanation

Explanation:

Elements in group fourteen are mostly known to form compounds in which there are four electron domains leading to a tetrahedral electron domain geometry.

However, the presence of lone pairs affects the shape of the molecule. SnCl3− has four electron domains, three of them are bond pairs while one is a lone pair. The shape of the molecule is based on a tetrahedron, however the observed geometry is trigonal pyramidal due to the presence of the lone pair. Its bond angle is now less than the predicted 109 degrees.

Answer:

Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO.

Answer:

covalent network

Explanation:

trust me on this one

Answer:

There are 1.8×1024 atoms in 1.5 mol HCl

Explanation:

Cooled in ice to help the water vapour condense. Tube 2 – contains lime water, goes cloudy to show the presence of carbon dioxide. Word equation: (hydrocarbon + oxygen → carbon dioxide + water) Methane + oxygen → carbon dioxide + water.

Answer:

407.7c

Explanation:

200.0C = 0.325 atm

400.0C = 0.650 atm

407.7C = 0.675 atm

A sample of neon gas at 200.0C has a pressure of 0.325 atm.  The temperature is 407.7 C is by the pressure reaches 0.675 atm.

There are three basis gas laws which relates the pressure, temperature, and volume of the gas.

The temperature and pressure increase is given this.

200.0C = 0.325 atm

400.0C = 0.650 atm

407.7C = 0.675 atm

Thus, the correct option is 407.7C = 0.675 atm.

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Answer:

A, Animal-like protists are called protozoa. ... Like animals, they can move, and they are heterotrophs. That means they eat things outside of themselves instead of producing their own food

Explanation:

Answer:

i think kinetic energy sorry if I'm wrong.

Answer:

The density of igneous rocks is related to its color. Darker colored rocks have a higher density because of its greater mineral and iron content. Its characteristics is opposite compared to lighter colored rocks that have less density because of lower mineral and iron content

Answer:

T2 = 547.2K

Explanation:

Given:

V1 = 135 ml. V2 = 250 ml

T1 = 295.5K. T2 = ?

Using Charles's law and solving for T2,

V1/T1 = V2/T2

T2 = (V2/V1)T1

= (250 ml/135 ml)(295.5K)

= 547.2K (or 273.2°C)

Answer:

1 1

Explanation:

Hill

1

Answer:

Zn + H2SO4  ZnSO4 + H2

Explanation:

Start by balancing the equation. This one is already balanced.

(1 zinc, 2 hydrogen, 1 sulfur and, 4 oxygen on each side of the equation).

The mole ratio just refers to the coefficient (the number before each molecule or atom). Since there are no numbers in this equation all coefficients are 1.

Mole ratio = 1:1

Answer:

Filtration and evaporation

Explanation:

A mixture of sand, pink sugar and water can be separated by filtration and evaporation.

The pink sugar is already dissolved in the water but the sand remains undissolved in the water hence it can be filtered off. The filtrate now contains the sugar.

The sugar is obtained from the filtrate by evaporation of the solution to yield the solid pink sugar and steam which can be condensed again to give liquid water.

Answer:

Yeah

Explanation:

Propylene glycol can be dehydrated to propionaldehyde which can in turn be reductively aminated to propylamine.

Propionaldehyde can be converted to n-propyl amine in two steps.

Conversion of propionaldehyde to oxime

Propionaldehyde is treated with hydroxyl amine in weakly acidic medium to form imine product known as propionaldoxime.

CH₃CH₂CHO+NH₂OH->CH₃CH₂CH=N-OH+H₂O

Reduction of imine to form amine

In this step,propionaldoxime is reduced by proper reducing agent like Na in ethanol to form n-propyl amine.

CH₃CH₂CH=NO-Na-C₂H5OH-> CH₃CH₂CH₂NH₂

Answer:

Explanation: It is an ionic compound  Fe2(C2O4)3

The compound  with the formula Fe₂(C₂O₄)₃ contains two iron atoms, 6 carbon atoms and 12 oxygen atoms. Thus option C is correct.

Chemical formula of a compound or molecule represent the identity of the compound by representing which atoms are present in how many numbers.

Chemical formula is significant in representing a compound and distinguish it from other compounds.The number of each atom are given as subscripts for the symbol of each atoms.

If any group of atoms such SO₄ group or CO₃ group repeats in the compound put them in brackets and their number is given outside.The compound Fe₂(C₂O₄)₃ contains 2 iron atoms because Fe is the symbol of iron.

C₂O₄ is oxalate group and it is 3 in number. Two carbon and 4 oxygens are there in one oxalate group. Thus there are total 6 carbons and 12 oxygens in 3 oxalate groups. Hence option C is correct.

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Answer:

Ea = 210.5kJ/mole

Explanation:

When the reaction:

O3 + NO → O2 + NO2

Occurs, requires 10.7kJ/mole and releases -199.8kJ/mole.

For the forward reaction:

O2 + NO2 → O3 + NO

The Ea is the sum of Ea of the forward reaction and - ΔH, that is:

Ea = Ea - (-ΔH)

Ea = 10.7kJ/mol - (-199.8kJ/mol)

Ea = 210.5kJ/mole

Answer:

Constant

Explanation:

Here's the definition of the noun:

"A situation that does not change"

In this case the situation is the speed of the object.

If you'd like to go into further detail, let's move away from English and jump into Physics. The question asked for "object's force" - keyword: 'force'. What's the formula for force? F = m * a.

F = Force, m = mass, a = acceleration.

Okay well, the question said only the speed changes and doesn't mention the mass changing so if the mass changes the force won't be constant. However, if the mass doesn't change (constant), we can continue to acceleration.

The formula for acceleration is (I think) m/s^2, that's metres over time, squared. As we know from English class; the speed is constant and thus the square of that speed is also constant - therefore the acceleration is constant.

Now, putting them together, assuming the mass is constant, we know the acceleration is constant so the force has to be constant. Case closed.

*mic drops, this was a waste of time*

Answer:

C) drain cleaner fizzes up as it encounters blockages in a pipe

Explanation:

Answer:

Explanation:

The number of particles can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is 6.02 × 10²³ entities

We have

N = 4.8 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

the answers to your question is b.22

Answer:

-1151.5 J

Explanation:

Given that:

The supplies energy = 245 L

The energy used in the expansion of gas = Pressure ×ΔV (change in volume)

At standard conditions;

Pressure = 105 × 10³ Pa

energy used in the expansion = 105 × 10³ Pa × (38.6 - 25.3)L

= 1396.5 J

Thus, the change in the energy of gas = 245 - 1396.5 J

= -1151.5 J

Hence, we can conclude that the gas has lost its own energy in the process of expansion.

Answer:

yes smoke is chemically combined because smoke is a collection of airborne solid and liquid particles and gases released when a material burn.

hope it is helpful to you

Answer:

Deduce the balanced chemical equation:

CaCO3(s) + 2HCl(aq) > CaCl2 + H2O(l) + CO2(g)

2. Write as ionic species:

Ca2+(aq) + CO3 2- (aq) + 2H+ + 2Cl- > Ca2+(aq)+ 2Cl-(aq) + H2O(l) + CO2(g)

3. Identify ions on the right that also appear on the left, and eliminate them. (As Robert Cruikshank says, these are known as ’spectator ions’ and take no overall part in the reaction):

CO3 2- (aq) + 2H+(aq) > H2O(l) + CO2(g)

This is the balanced ionic equation.